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ffmpeg / libavformat / avidec.c @ e356fc57

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1 de6d9b64 Fabrice Bellard
/*
2 7fbde343 Aurelien Jacobs
 * AVI demuxer
3 15d6e361 Diego Biurrun
 * Copyright (c) 2001 Fabrice Bellard
4 de6d9b64 Fabrice Bellard
 *
5 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8 19720f15 Fabrice Bellard
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10 b78e7197 Diego Biurrun
 * version 2.1 of the License, or (at your option) any later version.
11 de6d9b64 Fabrice Bellard
 *
12 b78e7197 Diego Biurrun
 * FFmpeg is distributed in the hope that it will be useful,
13 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 19720f15 Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16 de6d9b64 Fabrice Bellard
 *
17 19720f15 Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
18 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
19 5509bffa Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 de6d9b64 Fabrice Bellard
 */
21 7b114c09 Måns Rullgård
22 c13b250b Baptiste Coudurier
//#define DEBUG
23
//#define DEBUG_SEEK
24
25 933875a0 Aurelien Jacobs
#include <strings.h>
26 2bb6eba2 Aurelien Jacobs
#include "libavutil/intreadwrite.h"
27 7b114c09 Måns Rullgård
#include "libavutil/bswap.h"
28 de6d9b64 Fabrice Bellard
#include "avformat.h"
29
#include "avi.h"
30 7458ccbb Roman Shaposhnik
#include "dv.h"
31 9d9f4119 Måns Rullgård
#include "riff.h"
32 de6d9b64 Fabrice Bellard
33 52a0bbff Michael Niedermayer
#undef NDEBUG
34
#include <assert.h>
35
36 155e9ee9 Fabrice Bellard
typedef struct AVIStream {
37 7c7f3866 Michael Niedermayer
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
38 155e9ee9 Fabrice Bellard
                         (used to compute the pts) */
39 7c7f3866 Michael Niedermayer
    int remaining;
40
    int packet_size;
41
42 155e9ee9 Fabrice Bellard
    int scale;
43 115329f1 Diego Biurrun
    int rate;
44 8223bca5 Michael Niedermayer
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
45 115329f1 Diego Biurrun
46 94d1d6c0 Michael Niedermayer
    int64_t cum_len; /* temporary storage (used during seek) */
47 115329f1 Diego Biurrun
48 d2c5f0a4 Michael Niedermayer
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
49
    int prefix_count;
50 b7c40744 Michael Niedermayer
    uint32_t pal[256];
51
    int has_pal;
52 89ac23cd Michael Niedermayer
    int dshow_block_align;            ///< block align variable used to emulate bugs in the MS dshow demuxer
53 37287d41 Aurelien Jacobs
54
    AVFormatContext *sub_ctx;
55
    AVPacket sub_pkt;
56
    uint8_t *sub_buffer;
57 155e9ee9 Fabrice Bellard
} AVIStream;
58 de6d9b64 Fabrice Bellard
59
typedef struct {
60 7458ccbb Roman Shaposhnik
    int64_t  riff_end;
61
    int64_t  movi_end;
62 ea4b2b5e Michael Niedermayer
    int64_t  fsize;
63 bc5c918e Diego Biurrun
    int64_t movi_list;
64 7ccc636f Michael Niedermayer
    int64_t last_pkt_pos;
65 155e9ee9 Fabrice Bellard
    int index_loaded;
66 8f9298f8 Roman Shaposhnik
    int is_odml;
67 7c7f3866 Michael Niedermayer
    int non_interleaved;
68
    int stream_index;
69 ddaae6a9 Roman Shaposhnik
    DVDemuxContext* dv_demux;
70 0c0fd063 Michael Niedermayer
    int odml_depth;
71
#define MAX_ODML_DEPTH 1000
72 de6d9b64 Fabrice Bellard
} AVIContext;
73
74 7b31b092 Aurelien Jacobs
static const char avi_headers[][8] = {
75
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', ' ' },
76
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 'X' },
77
    { 'R', 'I', 'F', 'F',    'A', 'V', 'I', 0x19},
78 b925ef61 Aurelien Jacobs
    { 'O', 'N', '2', ' ',    'O', 'N', '2', 'f' },
79 0b04ebb3 Vladimir Voroshilov
    { 'R', 'I', 'F', 'F',    'A', 'M', 'V', ' ' },
80 7b31b092 Aurelien Jacobs
    { 0 }
81
};
82
83 42feef6b Michael Niedermayer
static int avi_load_index(AVFormatContext *s);
84 30a43f2d Michael Niedermayer
static int guess_ni_flag(AVFormatContext *s);
85 42feef6b Michael Niedermayer
86 6081f8c4 Mans Rullgard
#define print_tag(str, tag, size)                       \
87 dfd2a005 Luca Barbato
    av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n",       \
88 6081f8c4 Mans Rullgard
           str, tag & 0xff,                             \
89
           (tag >> 8) & 0xff,                           \
90
           (tag >> 16) & 0xff,                          \
91
           (tag >> 24) & 0xff,                          \
92
           size)
93 de6d9b64 Fabrice Bellard
94 8a472821 Michael Niedermayer
static inline int get_duration(AVIStream *ast, int len){
95
    if(ast->sample_size){
96
        return len;
97 89ac23cd Michael Niedermayer
    }else if (ast->dshow_block_align){
98
        return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
99 8a472821 Michael Niedermayer
    }else
100
        return 1;
101
}
102
103 ae628ec1 Anton Khirnov
static int get_riff(AVFormatContext *s, AVIOContext *pb)
104 06219cb1 Roman Shaposhnik
{
105 87ad63c0 Benoit Fouet
    AVIContext *avi = s->priv_data;
106 7b31b092 Aurelien Jacobs
    char header[8];
107
    int i;
108 06219cb1 Roman Shaposhnik
109 7b31b092 Aurelien Jacobs
    /* check RIFF header */
110 b7effd4e Anton Khirnov
    avio_read(pb, header, 4);
111
    avi->riff_end = avio_rl32(pb);  /* RIFF chunk size */
112 06219cb1 Roman Shaposhnik
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
113 b7effd4e Anton Khirnov
    avio_read(pb, header+4, 4);
114 7b31b092 Aurelien Jacobs
115
    for(i=0; avi_headers[i][0]; i++)
116
        if(!memcmp(header, avi_headers[i], 8))
117
            break;
118
    if(!avi_headers[i][0])
119 06219cb1 Roman Shaposhnik
        return -1;
120 115329f1 Diego Biurrun
121 7b31b092 Aurelien Jacobs
    if(header[7] == 0x19)
122 87ad63c0 Benoit Fouet
        av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
123 7b31b092 Aurelien Jacobs
124 06219cb1 Roman Shaposhnik
    return 0;
125
}
126
127 94d1d6c0 Michael Niedermayer
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
128 8945ebb9 Michael Niedermayer
    AVIContext *avi = s->priv_data;
129 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
130 b7effd4e Anton Khirnov
    int longs_pre_entry= avio_rl16(pb);
131
    int index_sub_type = avio_r8(pb);
132
    int index_type     = avio_r8(pb);
133
    int entries_in_use = avio_rl32(pb);
134
    int chunk_id       = avio_rl32(pb);
135
    int64_t base       = avio_rl64(pb);
136 94d1d6c0 Michael Niedermayer
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
137
    AVStream *st;
138
    AVIStream *ast;
139
    int i;
140 8945ebb9 Michael Niedermayer
    int64_t last_pos= -1;
141 899681cd Björn Axelsson
    int64_t filesize= url_fsize(s->pb);
142 94d1d6c0 Michael Niedermayer
143 965a63af Michael Niedermayer
#ifdef DEBUG_SEEK
144 949b1a13 Steve L'Homme
    av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
145 965a63af Michael Niedermayer
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
146
#endif
147 94d1d6c0 Michael Niedermayer
148 1ac08937 Michael Niedermayer
    if(stream_id >= s->nb_streams || stream_id < 0)
149 94d1d6c0 Michael Niedermayer
        return -1;
150
    st= s->streams[stream_id];
151
    ast = st->priv_data;
152
153
    if(index_sub_type)
154
        return -1;
155
156 b7effd4e Anton Khirnov
    avio_rl32(pb);
157 94d1d6c0 Michael Niedermayer
158
    if(index_type && longs_pre_entry != 2)
159
        return -1;
160
    if(index_type>1)
161
        return -1;
162
163 965a63af Michael Niedermayer
    if(filesize > 0 && base >= filesize){
164
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
165
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
166
            base &= 0xFFFFFFFF;
167
        else
168
            return -1;
169
    }
170
171 94d1d6c0 Michael Niedermayer
    for(i=0; i<entries_in_use; i++){
172
        if(index_type){
173 b7effd4e Anton Khirnov
            int64_t pos= avio_rl32(pb) + base - 8;
174
            int len    = avio_rl32(pb);
175 30a43f2d Michael Niedermayer
            int key= len >= 0;
176 94d1d6c0 Michael Niedermayer
            len &= 0x7FFFFFFF;
177
178 965a63af Michael Niedermayer
#ifdef DEBUG_SEEK
179 949b1a13 Steve L'Homme
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
180 965a63af Michael Niedermayer
#endif
181 8ebe099a Michael Niedermayer
            if(url_feof(pb))
182
                return -1;
183
184 8945ebb9 Michael Niedermayer
            if(last_pos == pos || pos == base - 8)
185
                avi->non_interleaved= 1;
186 df84d7d9 Michael Niedermayer
            if(last_pos != pos && (len || !ast->sample_size))
187 83a4d356 Michael Niedermayer
                av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
188 30a43f2d Michael Niedermayer
189 8a472821 Michael Niedermayer
            ast->cum_len += get_duration(ast, len);
190 8945ebb9 Michael Niedermayer
            last_pos= pos;
191 94d1d6c0 Michael Niedermayer
        }else{
192 26b89135 Måns Rullgård
            int64_t offset, pos;
193
            int duration;
194 b7effd4e Anton Khirnov
            offset = avio_rl64(pb);
195
            avio_rl32(pb);       /* size */
196
            duration = avio_rl32(pb);
197 8ebe099a Michael Niedermayer
198
            if(url_feof(pb))
199
                return -1;
200
201 26b89135 Måns Rullgård
            pos = url_ftell(pb);
202 94d1d6c0 Michael Niedermayer
203 0c0fd063 Michael Niedermayer
            if(avi->odml_depth > MAX_ODML_DEPTH){
204
                av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
205
                return -1;
206
            }
207
208 6b4aa5da Anton Khirnov
            avio_seek(pb, offset+8, SEEK_SET);
209 0c0fd063 Michael Niedermayer
            avi->odml_depth++;
210 94d1d6c0 Michael Niedermayer
            read_braindead_odml_indx(s, frame_num);
211 0c0fd063 Michael Niedermayer
            avi->odml_depth--;
212 94d1d6c0 Michael Niedermayer
            frame_num += duration;
213
214 6b4aa5da Anton Khirnov
            avio_seek(pb, pos, SEEK_SET);
215 94d1d6c0 Michael Niedermayer
        }
216
    }
217 965a63af Michael Niedermayer
    avi->index_loaded=1;
218 94d1d6c0 Michael Niedermayer
    return 0;
219
}
220
221 115e8ae5 Michael Niedermayer
static void clean_index(AVFormatContext *s){
222 965a63af Michael Niedermayer
    int i;
223
    int64_t j;
224 115e8ae5 Michael Niedermayer
225
    for(i=0; i<s->nb_streams; i++){
226
        AVStream *st = s->streams[i];
227
        AVIStream *ast = st->priv_data;
228
        int n= st->nb_index_entries;
229
        int max= ast->sample_size;
230
        int64_t pos, size, ts;
231
232
        if(n != 1 || ast->sample_size==0)
233
            continue;
234
235
        while(max < 1024) max+=max;
236
237
        pos= st->index_entries[0].pos;
238
        size= st->index_entries[0].size;
239
        ts= st->index_entries[0].timestamp;
240
241
        for(j=0; j<size; j+=max){
242 83a4d356 Michael Niedermayer
            av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
243 115e8ae5 Michael Niedermayer
        }
244
    }
245
}
246
247 04d2540c Anton Khirnov
static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
248 57060f89 David Conrad
{
249 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
250 04d2540c Anton Khirnov
    char key[5] = {0}, *value;
251 47146dfb Michael Niedermayer
252 57060f89 David Conrad
    size += (size & 1);
253 47146dfb Michael Niedermayer
254 12ad6671 Michael Niedermayer
    if (size == UINT_MAX)
255
        return -1;
256
    value = av_malloc(size+1);
257
    if (!value)
258
        return -1;
259 b7effd4e Anton Khirnov
    avio_read(pb, value, size);
260 7a9af8ec Michael Niedermayer
    value[size]=0;
261 12ad6671 Michael Niedermayer
262 04d2540c Anton Khirnov
    AV_WL32(key, tag);
263
264 d35cdd57 Aurelien Jacobs
    return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
265
                            AV_METADATA_DONT_STRDUP_VAL);
266 57060f89 David Conrad
}
267
268 04d2540c Anton Khirnov
static void avi_read_info(AVFormatContext *s, uint64_t end)
269
{
270
    while (url_ftell(s->pb) < end) {
271 b7effd4e Anton Khirnov
        uint32_t tag  = avio_rl32(s->pb);
272
        uint32_t size = avio_rl32(s->pb);
273 04d2540c Anton Khirnov
        avi_read_tag(s, NULL, tag, size);
274
    }
275
}
276
277 933875a0 Aurelien Jacobs
static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
278
                                    "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
279
280
static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
281
{
282
    char month[4], time[9], buffer[64];
283
    int i, day, year;
284
    /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
285
    if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
286 73d0e331 Aurelien Jacobs
               month, &day, time, &year) == 4) {
287 933875a0 Aurelien Jacobs
        for (i=0; i<12; i++)
288
            if (!strcasecmp(month, months[i])) {
289
                snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
290
                         year, i+1, day, time);
291
                av_metadata_set2(metadata, "creation_time", buffer, 0);
292
            }
293 73d0e331 Aurelien Jacobs
    } else if (date[4] == '/' && date[7] == '/') {
294
        date[4] = date[7] = '-';
295
        av_metadata_set2(metadata, "creation_time", date, 0);
296
    }
297 933875a0 Aurelien Jacobs
}
298
299 8ba5bf5a Aurelien Jacobs
static void avi_read_nikon(AVFormatContext *s, uint64_t end)
300
{
301
    while (url_ftell(s->pb) < end) {
302 b7effd4e Anton Khirnov
        uint32_t tag  = avio_rl32(s->pb);
303
        uint32_t size = avio_rl32(s->pb);
304 8ba5bf5a Aurelien Jacobs
        switch (tag) {
305
        case MKTAG('n', 'c', 't', 'g'): {  /* Nikon Tags */
306
            uint64_t tag_end = url_ftell(s->pb) + size;
307
            while (url_ftell(s->pb) < tag_end) {
308 b7effd4e Anton Khirnov
                uint16_t tag  = avio_rl16(s->pb);
309
                uint16_t size = avio_rl16(s->pb);
310 8ba5bf5a Aurelien Jacobs
                const char *name = NULL;
311
                char buffer[64] = {0};
312 b7effd4e Anton Khirnov
                size -= avio_read(s->pb, buffer,
313 8ba5bf5a Aurelien Jacobs
                                   FFMIN(size, sizeof(buffer)-1));
314
                switch (tag) {
315
                case 0x03:  name = "maker";  break;
316
                case 0x04:  name = "model";  break;
317
                case 0x13:  name = "creation_time";
318
                    if (buffer[4] == ':' && buffer[7] == ':')
319
                        buffer[4] = buffer[7] = '-';
320
                    break;
321
                }
322
                if (name)
323
                    av_metadata_set2(&s->metadata, name, buffer, 0);
324 e356fc57 Anton Khirnov
                avio_seek(s->pb, size, SEEK_CUR);
325 8ba5bf5a Aurelien Jacobs
            }
326
            break;
327
        }
328
        default:
329 e356fc57 Anton Khirnov
            avio_seek(s->pb, size, SEEK_CUR);
330 8ba5bf5a Aurelien Jacobs
            break;
331
        }
332
    }
333
}
334
335 1101abfe Zdenek Kabelac
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
336 de6d9b64 Fabrice Bellard
{
337 c9a65ca8 Fabrice Bellard
    AVIContext *avi = s->priv_data;
338 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
339 9d9aac84 Marc Mason
    unsigned int tag, tag1, handler;
340 b53f1064 Michael Niedermayer
    int codec_type, stream_index, frame_period, bit_rate;
341 bce8840a Michael Niedermayer
    unsigned int size;
342 6d29fba9 Michael Niedermayer
    int i;
343 de6d9b64 Fabrice Bellard
    AVStream *st;
344 26b89135 Måns Rullgård
    AVIStream *ast = NULL;
345 0b04ebb3 Vladimir Voroshilov
    int avih_width=0, avih_height=0;
346
    int amv_file_format=0;
347 5a4a4d78 Reimar Döffinger
    uint64_t list_end = 0;
348 de6d9b64 Fabrice Bellard
349 7c7f3866 Michael Niedermayer
    avi->stream_index= -1;
350 115329f1 Diego Biurrun
351 037c08d6 Måns Rullgård
    if (get_riff(s, pb) < 0)
352 de6d9b64 Fabrice Bellard
        return -1;
353 1101abfe Zdenek Kabelac
354 ea4b2b5e Michael Niedermayer
    avi->fsize = url_fsize(pb);
355
    if(avi->fsize<=0)
356 87657891 Baptiste Coudurier
        avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
357 ea4b2b5e Michael Niedermayer
358 de6d9b64 Fabrice Bellard
    /* first list tag */
359
    stream_index = -1;
360
    codec_type = -1;
361
    frame_period = 0;
362
    for(;;) {
363
        if (url_feof(pb))
364
            goto fail;
365 b7effd4e Anton Khirnov
        tag = avio_rl32(pb);
366
        size = avio_rl32(pb);
367 6081f8c4 Mans Rullgard
368 de6d9b64 Fabrice Bellard
        print_tag("tag", tag, size);
369
370
        switch(tag) {
371
        case MKTAG('L', 'I', 'S', 'T'):
372 5a4a4d78 Reimar Döffinger
            list_end = url_ftell(pb) + size;
373 15d6e361 Diego Biurrun
            /* Ignored, except at start of video packets. */
374 b7effd4e Anton Khirnov
            tag1 = avio_rl32(pb);
375 6081f8c4 Mans Rullgard
376 de6d9b64 Fabrice Bellard
            print_tag("list", tag1, 0);
377 6081f8c4 Mans Rullgard
378 de6d9b64 Fabrice Bellard
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
379 155e9ee9 Fabrice Bellard
                avi->movi_list = url_ftell(pb) - 4;
380 2064c77a David Conrad
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
381 a965c478 Aurelien Jacobs
                else     avi->movi_end = url_fsize(pb);
382 dfd2a005 Luca Barbato
                av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
383 de6d9b64 Fabrice Bellard
                goto end_of_header;
384
            }
385 04d2540c Anton Khirnov
            else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
386
                avi_read_info(s, list_end);
387 8ba5bf5a Aurelien Jacobs
            else if (tag1 == MKTAG('n', 'c', 'd', 't'))
388
                avi_read_nikon(s, list_end);
389 04d2540c Anton Khirnov
390 de6d9b64 Fabrice Bellard
            break;
391 933875a0 Aurelien Jacobs
        case MKTAG('I', 'D', 'I', 'T'): {
392
            unsigned char date[64] = {0};
393
            size += (size & 1);
394 b7effd4e Anton Khirnov
            size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1));
395 e356fc57 Anton Khirnov
            avio_seek(pb, size, SEEK_CUR);
396 933875a0 Aurelien Jacobs
            avi_metadata_creation_time(&s->metadata, date);
397
            break;
398
        }
399 8f9298f8 Roman Shaposhnik
        case MKTAG('d', 'm', 'l', 'h'):
400 bb270c08 Diego Biurrun
            avi->is_odml = 1;
401 e356fc57 Anton Khirnov
            avio_seek(pb, size + (size & 1), SEEK_CUR);
402 bb270c08 Diego Biurrun
            break;
403 0b04ebb3 Vladimir Voroshilov
        case MKTAG('a', 'm', 'v', 'h'):
404
            amv_file_format=1;
405 de6d9b64 Fabrice Bellard
        case MKTAG('a', 'v', 'i', 'h'):
406 15d6e361 Diego Biurrun
            /* AVI header */
407 1101abfe Zdenek Kabelac
            /* using frame_period is bad idea */
408 b7effd4e Anton Khirnov
            frame_period = avio_rl32(pb);
409
            bit_rate = avio_rl32(pb) * 8;
410
            avio_rl32(pb);
411
            avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
412 1894edeb Michael Niedermayer
413 e356fc57 Anton Khirnov
            avio_seek(pb, 2 * 4, SEEK_CUR);
414 b7effd4e Anton Khirnov
            avio_rl32(pb);
415
            avio_rl32(pb);
416
            avih_width=avio_rl32(pb);
417
            avih_height=avio_rl32(pb);
418 6d29fba9 Michael Niedermayer
419 e356fc57 Anton Khirnov
            avio_seek(pb, size - 10 * 4, SEEK_CUR);
420 6d29fba9 Michael Niedermayer
            break;
421
        case MKTAG('s', 't', 'r', 'h'):
422
            /* stream header */
423
424 b7effd4e Anton Khirnov
            tag1 = avio_rl32(pb);
425
            handler = avio_rl32(pb); /* codec tag */
426 6d29fba9 Michael Niedermayer
427
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
428 e356fc57 Anton Khirnov
                avio_seek(pb, size - 8, SEEK_CUR);
429 6d29fba9 Michael Niedermayer
                break;
430
            }else{
431
                stream_index++;
432
                st = av_new_stream(s, stream_index);
433 de6d9b64 Fabrice Bellard
                if (!st)
434
                    goto fail;
435 9ee91c2f Michael Niedermayer
436 155e9ee9 Fabrice Bellard
                ast = av_mallocz(sizeof(AVIStream));
437
                if (!ast)
438
                    goto fail;
439
                st->priv_data = ast;
440 bb270c08 Diego Biurrun
            }
441 0b04ebb3 Vladimir Voroshilov
            if(amv_file_format)
442
                tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
443 6d29fba9 Michael Niedermayer
444 e344c1ea Steve L'Homme
            print_tag("strh", tag1, -1);
445 6081f8c4 Mans Rullgard
446 b53f1064 Michael Niedermayer
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
447 6eb2de74 Roman Shaposhnik
                int64_t dv_dur;
448
449 115329f1 Diego Biurrun
                /*
450 bb270c08 Diego Biurrun
                 * After some consideration -- I don't think we
451 15d6e361 Diego Biurrun
                 * have to support anything but DV in type1 AVIs.
452 bb270c08 Diego Biurrun
                 */
453
                if (s->nb_streams != 1)
454
                    goto fail;
455
456
                if (handler != MKTAG('d', 'v', 's', 'd') &&
457
                    handler != MKTAG('d', 'v', 'h', 'd') &&
458
                    handler != MKTAG('d', 'v', 's', 'l'))
459
                   goto fail;
460
461
                ast = s->streams[0]->priv_data;
462
                av_freep(&s->streams[0]->codec->extradata);
463 a58e6cea Jai Menon
                av_freep(&s->streams[0]->codec);
464 bb270c08 Diego Biurrun
                av_freep(&s->streams[0]);
465
                s->nb_streams = 0;
466 49fb20cb Aurelien Jacobs
                if (CONFIG_DV_DEMUXER) {
467 38ca53da Aurelien Jacobs
                    avi->dv_demux = dv_init_demux(s);
468
                    if (!avi->dv_demux)
469
                        goto fail;
470 a2a6332b Aurelien Jacobs
                }
471 bb270c08 Diego Biurrun
                s->streams[0]->priv_data = ast;
472 e356fc57 Anton Khirnov
                avio_seek(pb, 3 * 4, SEEK_CUR);
473 b7effd4e Anton Khirnov
                ast->scale = avio_rl32(pb);
474
                ast->rate = avio_rl32(pb);
475 e356fc57 Anton Khirnov
                avio_seek(pb, 4, SEEK_CUR);  /* start time */
476 6eb2de74 Roman Shaposhnik
477 b7effd4e Anton Khirnov
                dv_dur = avio_rl32(pb);
478 6eb2de74 Roman Shaposhnik
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
479
                    dv_dur *= AV_TIME_BASE;
480
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
481
                }
482
                /*
483
                 * else, leave duration alone; timing estimation in utils.c
484 15d6e361 Diego Biurrun
                 *      will make a guess based on bitrate.
485 6eb2de74 Roman Shaposhnik
                 */
486
487 bb270c08 Diego Biurrun
                stream_index = s->nb_streams - 1;
488 e356fc57 Anton Khirnov
                avio_seek(pb, size - 9*4, SEEK_CUR);
489 b53f1064 Michael Niedermayer
                break;
490
            }
491 b559b29b Michael Niedermayer
492 6d29fba9 Michael Niedermayer
            assert(stream_index < s->nb_streams);
493 01f4895c Michael Niedermayer
            st->codec->stream_codec_tag= handler;
494 b559b29b Michael Niedermayer
495 b7effd4e Anton Khirnov
            avio_rl32(pb); /* flags */
496
            avio_rl16(pb); /* priority */
497
            avio_rl16(pb); /* language */
498
            avio_rl32(pb); /* initial frame */
499
            ast->scale = avio_rl32(pb);
500
            ast->rate = avio_rl32(pb);
501 4a030a1f Michael Niedermayer
            if(!(ast->scale && ast->rate)){
502 15d6e361 Diego Biurrun
                av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
503 0dbb6515 Michael Niedermayer
                if(frame_period){
504
                    ast->rate = 1000000;
505
                    ast->scale = frame_period;
506
                }else{
507
                    ast->rate = 25;
508
                    ast->scale = 1;
509
                }
510 4a030a1f Michael Niedermayer
            }
511 b53f1064 Michael Niedermayer
            av_set_pts_info(st, 64, ast->scale, ast->rate);
512 115329f1 Diego Biurrun
513 b7effd4e Anton Khirnov
            ast->cum_len=avio_rl32(pb); /* start */
514
            st->nb_frames = avio_rl32(pb);
515 b559b29b Michael Niedermayer
516 b53f1064 Michael Niedermayer
            st->start_time = 0;
517 b7effd4e Anton Khirnov
            avio_rl32(pb); /* buffer size */
518
            avio_rl32(pb); /* quality */
519
            ast->sample_size = avio_rl32(pb); /* sample ssize */
520 2b70eb2b Michael Niedermayer
            ast->cum_len *= FFMAX(1, ast->sample_size);
521 87ad63c0 Benoit Fouet
//            av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
522 247eadca Fabrice Bellard
523 b53f1064 Michael Niedermayer
            switch(tag1) {
524 bb270c08 Diego Biurrun
            case MKTAG('v', 'i', 'd', 's'):
525 72415b2a Stefano Sabatini
                codec_type = AVMEDIA_TYPE_VIDEO;
526 247eadca Fabrice Bellard
527 b53f1064 Michael Niedermayer
                ast->sample_size = 0;
528
                break;
529
            case MKTAG('a', 'u', 'd', 's'):
530 72415b2a Stefano Sabatini
                codec_type = AVMEDIA_TYPE_AUDIO;
531 9bf9a5fc Michael Niedermayer
                break;
532 cc11e2b3 Michael Niedermayer
            case MKTAG('t', 'x', 't', 's'):
533 37287d41 Aurelien Jacobs
                codec_type = AVMEDIA_TYPE_SUBTITLE;
534 cc11e2b3 Michael Niedermayer
                break;
535 25176d6e Florian Echtler
            case MKTAG('d', 'a', 't', 's'):
536 72415b2a Stefano Sabatini
                codec_type = AVMEDIA_TYPE_DATA;
537 25176d6e Florian Echtler
                break;
538 9bf9a5fc Michael Niedermayer
            default:
539 30667f42 Michael Niedermayer
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
540 9bf9a5fc Michael Niedermayer
                goto fail;
541 de6d9b64 Fabrice Bellard
            }
542 3c8d75e6 Michael Niedermayer
            if(ast->sample_size == 0)
543
                st->duration = st->nb_frames;
544 2b70eb2b Michael Niedermayer
            ast->frame_offset= ast->cum_len;
545 e356fc57 Anton Khirnov
            avio_seek(pb, size - 12 * 4, SEEK_CUR);
546 de6d9b64 Fabrice Bellard
            break;
547
        case MKTAG('s', 't', 'r', 'f'):
548
            /* stream header */
549 6d29fba9 Michael Niedermayer
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
550 e356fc57 Anton Khirnov
                avio_seek(pb, size, SEEK_CUR);
551 de6d9b64 Fabrice Bellard
            } else {
552 5a4a4d78 Reimar Döffinger
                uint64_t cur_pos = url_ftell(pb);
553
                if (cur_pos < list_end)
554
                    size = FFMIN(size, list_end - cur_pos);
555 de6d9b64 Fabrice Bellard
                st = s->streams[stream_index];
556
                switch(codec_type) {
557 72415b2a Stefano Sabatini
                case AVMEDIA_TYPE_VIDEO:
558 0b04ebb3 Vladimir Voroshilov
                    if(amv_file_format){
559
                        st->codec->width=avih_width;
560
                        st->codec->height=avih_height;
561 72415b2a Stefano Sabatini
                        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
562 0b04ebb3 Vladimir Voroshilov
                        st->codec->codec_id = CODEC_ID_AMV;
563 e356fc57 Anton Khirnov
                        avio_seek(pb, size, SEEK_CUR);
564 0b04ebb3 Vladimir Voroshilov
                        break;
565
                    }
566 456a70ae Peter Ross
                    tag1 = ff_get_bmp_header(pb, st);
567 b559b29b Michael Niedermayer
568 bce8840a Michael Niedermayer
                    if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
569 72415b2a Stefano Sabatini
                        st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
570 cbb79c0e Reimar Döffinger
                        st->codec->codec_tag = tag1;
571
                        st->codec->codec_id = CODEC_ID_XSUB;
572
                        break;
573
                    }
574
575 e344c1ea Steve L'Homme
                    if(size > 10*4 && size<(1<<30)){
576
                        st->codec->extradata_size= size - 10*4;
577
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
578 3dcddf82 Reimar Döffinger
                        if (!st->codec->extradata) {
579
                            st->codec->extradata_size= 0;
580
                            return AVERROR(ENOMEM);
581
                        }
582 b7effd4e Anton Khirnov
                        avio_read(pb, st->codec->extradata, st->codec->extradata_size);
583 e344c1ea Steve L'Homme
                    }
584 115329f1 Diego Biurrun
585 01f4895c Michael Niedermayer
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
586 b7effd4e Anton Khirnov
                        avio_r8(pb);
587 b559b29b Michael Niedermayer
588 15d6e361 Diego Biurrun
                    /* Extract palette from extradata if bpp <= 8. */
589
                    /* This code assumes that extradata contains only palette. */
590
                    /* This is true for all paletted codecs implemented in FFmpeg. */
591 dd1c8f3e Luca Abeni
                    if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
592 01f4895c Michael Niedermayer
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
593 63613fe6 Måns Rullgård
#if HAVE_BIGENDIAN
594 01f4895c Michael Niedermayer
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
595 8fc0162a Måns Rullgård
                            st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
596 5e29abf8 Roberto Togni
#else
597 01f4895c Michael Niedermayer
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
598
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
599 5e29abf8 Roberto Togni
#endif
600 01f4895c Michael Niedermayer
                        st->codec->palctrl->palette_changed = 1;
601 5e29abf8 Roberto Togni
                    }
602
603 de6d9b64 Fabrice Bellard
                    print_tag("video", tag1, 0);
604 6081f8c4 Mans Rullgard
605 72415b2a Stefano Sabatini
                    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
606 01f4895c Michael Niedermayer
                    st->codec->codec_tag = tag1;
607 1a40491e Daniel Verkamp
                    st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
608 15d6e361 Diego Biurrun
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
609 0941ee0f Carl Eugen Hoyos
                    // Support "Resolution 1:1" for Avid AVI Codec
610
                    if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
611
                       st->codec->extradata_size >= 31 &&
612
                       !memcmp(&st->codec->extradata[28], "1:1", 3))
613
                        st->codec->codec_id = CODEC_ID_RAWVIDEO;
614 31f2616d Michael Niedermayer
615
                    if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
616
                        st->codec->extradata_size+= 9;
617
                        st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
618
                        if(st->codec->extradata)
619
                            memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
620
                    }
621
                    st->codec->height= FFABS(st->codec->height);
622
623 e356fc57 Anton Khirnov
//                    avio_seek(pb, size - 5 * 4, SEEK_CUR);
624 de6d9b64 Fabrice Bellard
                    break;
625 72415b2a Stefano Sabatini
                case AVMEDIA_TYPE_AUDIO:
626 1a40491e Daniel Verkamp
                    ff_get_wav_header(pb, st->codec, size);
627 89ac23cd Michael Niedermayer
                    ast->dshow_block_align= st->codec->block_align;
628 78db672c Michael Niedermayer
                    if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
629 143b0820 Michael Niedermayer
                        av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
630 78db672c Michael Niedermayer
                        ast->sample_size= st->codec->block_align;
631
                    }
632 bf29cbc2 Sebastian Vater
                    if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
633 e356fc57 Anton Khirnov
                        avio_seek(pb, 1, SEEK_CUR);
634 5836d158 Diego Biurrun
                    /* Force parsing as several audio frames can be in
635 15d6e361 Diego Biurrun
                     * one packet and timestamps refer to packet start. */
636 a74008a4 Joakim Plate
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
637 15d6e361 Diego Biurrun
                    /* ADTS header is in extradata, AAC without header must be
638
                     * stored as exact frames. Parser not needed and it will
639
                     * fail. */
640 cbee7a69 Baptiste Coudurier
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
641 57004ff1 Aurelien Jacobs
                        st->need_parsing = AVSTREAM_PARSE_NONE;
642 8662900b Diego Biurrun
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
643
                     * audio in the header but have Axan as stream_code_tag. */
644 2bb6eba2 Aurelien Jacobs
                    if (st->codec->stream_codec_tag == AV_RL32("Axan")){
645 8662900b Diego Biurrun
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
646
                        st->codec->codec_tag = 0;
647
                    }
648 9862f9e1 Michael Niedermayer
                    if (amv_file_format){
649 0b04ebb3 Vladimir Voroshilov
                        st->codec->codec_id  = CODEC_ID_ADPCM_IMA_AMV;
650 9862f9e1 Michael Niedermayer
                        ast->dshow_block_align = 0;
651
                    }
652 de6d9b64 Fabrice Bellard
                    break;
653 37287d41 Aurelien Jacobs
                case AVMEDIA_TYPE_SUBTITLE:
654
                    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
655
                    st->codec->codec_id   = CODEC_ID_PROBE;
656
                    break;
657 de6d9b64 Fabrice Bellard
                default:
658 72415b2a Stefano Sabatini
                    st->codec->codec_type = AVMEDIA_TYPE_DATA;
659 01f4895c Michael Niedermayer
                    st->codec->codec_id= CODEC_ID_NONE;
660
                    st->codec->codec_tag= 0;
661 e356fc57 Anton Khirnov
                    avio_seek(pb, size, SEEK_CUR);
662 de6d9b64 Fabrice Bellard
                    break;
663
                }
664
            }
665
            break;
666 94d1d6c0 Michael Niedermayer
        case MKTAG('i', 'n', 'd', 'x'):
667
            i= url_ftell(pb);
668 2c00106c Michael Niedermayer
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
669 b7b22558 Michael Niedermayer
                read_braindead_odml_indx(s, 0);
670
            }
671 6b4aa5da Anton Khirnov
            avio_seek(pb, i+size, SEEK_SET);
672 94d1d6c0 Michael Niedermayer
            break;
673 c86ec2f4 Michael Niedermayer
        case MKTAG('v', 'p', 'r', 'p'):
674
            if(stream_index < (unsigned)s->nb_streams && size > 9*4){
675
                AVRational active, active_aspect;
676
677
                st = s->streams[stream_index];
678 b7effd4e Anton Khirnov
                avio_rl32(pb);
679
                avio_rl32(pb);
680
                avio_rl32(pb);
681
                avio_rl32(pb);
682
                avio_rl32(pb);
683
684
                active_aspect.den= avio_rl16(pb);
685
                active_aspect.num= avio_rl16(pb);
686
                active.num       = avio_rl32(pb);
687
                active.den       = avio_rl32(pb);
688
                avio_rl32(pb); //nbFieldsPerFrame
689 c86ec2f4 Michael Niedermayer
690
                if(active_aspect.num && active_aspect.den && active.num && active.den){
691 59729451 Aurelien Jacobs
                    st->sample_aspect_ratio= av_div_q(active_aspect, active);
692 c86ec2f4 Michael Niedermayer
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
693
                }
694
                size -= 9*4;
695
            }
696 6b4aa5da Anton Khirnov
            avio_seek(pb, size, SEEK_CUR);
697 c86ec2f4 Michael Niedermayer
            break;
698 7a9af8ec Michael Niedermayer
        case MKTAG('s', 't', 'r', 'n'):
699
            if(s->nb_streams){
700 04d2540c Anton Khirnov
                avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
701 7a9af8ec Michael Niedermayer
                break;
702
            }
703 de6d9b64 Fabrice Bellard
        default:
704 755c18ae Michael Niedermayer
            if(size > 1000000){
705 15d6e361 Diego Biurrun
                av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
706
                                        "I will ignore it and try to continue anyway.\n");
707 755c18ae Michael Niedermayer
                avi->movi_list = url_ftell(pb) - 4;
708
                avi->movi_end  = url_fsize(pb);
709
                goto end_of_header;
710
            }
711 de6d9b64 Fabrice Bellard
            /* skip tag */
712
            size += (size & 1);
713 e356fc57 Anton Khirnov
            avio_seek(pb, size, SEEK_CUR);
714 de6d9b64 Fabrice Bellard
            break;
715
        }
716
    }
717
 end_of_header:
718
    /* check stream number */
719
    if (stream_index != s->nb_streams - 1) {
720
    fail:
721
        return -1;
722
    }
723 1101abfe Zdenek Kabelac
724 b7b22558 Michael Niedermayer
    if(!avi->index_loaded && !url_is_streamed(pb))
725 94d1d6c0 Michael Niedermayer
        avi_load_index(s);
726 42feef6b Michael Niedermayer
    avi->index_loaded = 1;
727 30a43f2d Michael Niedermayer
    avi->non_interleaved |= guess_ni_flag(s);
728 fbfccc04 Michael Niedermayer
    for(i=0; i<s->nb_streams; i++){
729
        AVStream *st = s->streams[i];
730
        if(st->nb_index_entries)
731
            break;
732
    }
733
    if(i==s->nb_streams && avi->non_interleaved) {
734
        av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
735
        avi->non_interleaved=0;
736
    }
737
738 9d4cd3bf Michael Niedermayer
    if(avi->non_interleaved) {
739 15d6e361 Diego Biurrun
        av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
740 115e8ae5 Michael Niedermayer
        clean_index(s);
741 9d4cd3bf Michael Niedermayer
    }
742 115329f1 Diego Biurrun
743 03700d39 Anton Khirnov
    ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
744
745 de6d9b64 Fabrice Bellard
    return 0;
746
}
747
748 37287d41 Aurelien Jacobs
static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
749
    if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
750 47fdf00a Anton Khirnov
        uint8_t desc[256];
751
        int score = AVPROBE_SCORE_MAX / 2, ret;
752 37287d41 Aurelien Jacobs
        AVIStream *ast = st->priv_data;
753
        AVInputFormat *sub_demuxer;
754
        AVRational time_base;
755 8d9ac969 Anton Khirnov
        AVIOContext *pb = avio_alloc_context( pkt->data + 7,
756 47fdf00a Anton Khirnov
                                              pkt->size - 7,
757
                                              0, NULL, NULL, NULL, NULL);
758 37287d41 Aurelien Jacobs
        AVProbeData pd;
759 b7effd4e Anton Khirnov
        unsigned int desc_len = avio_rl32(pb);
760 37287d41 Aurelien Jacobs
761 47fdf00a Anton Khirnov
        if (desc_len > pb->buf_end - pb->buf_ptr)
762
            goto error;
763 37287d41 Aurelien Jacobs
764 47fdf00a Anton Khirnov
        ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
765 e356fc57 Anton Khirnov
        avio_seek(pb, desc_len - ret, SEEK_CUR);
766 37287d41 Aurelien Jacobs
        if (*desc)
767
            av_metadata_set2(&st->metadata, "title", desc, 0);
768
769 b7effd4e Anton Khirnov
        avio_rl16(pb);   /* flags? */
770
        avio_rl32(pb);   /* data size */
771 37287d41 Aurelien Jacobs
772 47fdf00a Anton Khirnov
        pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr };
773 37287d41 Aurelien Jacobs
        if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
774 47fdf00a Anton Khirnov
            goto error;
775 37287d41 Aurelien Jacobs
776
        if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
777
            av_read_packet(ast->sub_ctx, &ast->sub_pkt);
778
            *st->codec = *ast->sub_ctx->streams[0]->codec;
779
            ast->sub_ctx->streams[0]->codec->extradata = NULL;
780
            time_base = ast->sub_ctx->streams[0]->time_base;
781
            av_set_pts_info(st, 64, time_base.num, time_base.den);
782
        }
783
        ast->sub_buffer = pkt->data;
784
        memset(pkt, 0, sizeof(*pkt));
785
        return 1;
786 47fdf00a Anton Khirnov
error:
787
        av_freep(&pb);
788 37287d41 Aurelien Jacobs
    }
789
    return 0;
790
}
791
792
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
793
                                  AVPacket *pkt)
794
{
795
    AVIStream *ast, *next_ast = next_st->priv_data;
796
    int64_t ts, next_ts, ts_min = INT64_MAX;
797
    AVStream *st, *sub_st = NULL;
798
    int i;
799
800
    next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
801
                           AV_TIME_BASE_Q);
802
803
    for (i=0; i<s->nb_streams; i++) {
804
        st  = s->streams[i];
805
        ast = st->priv_data;
806 4ed899f2 Andrew Wason
        if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
807 37287d41 Aurelien Jacobs
            ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
808
            if (ts <= next_ts && ts < ts_min) {
809
                ts_min = ts;
810
                sub_st = st;
811
            }
812
        }
813
    }
814
815
    if (sub_st) {
816
        ast = sub_st->priv_data;
817
        *pkt = ast->sub_pkt;
818
        pkt->stream_index = sub_st->index;
819
        if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
820
            ast->sub_pkt.data = NULL;
821
    }
822
    return sub_st;
823
}
824
825 f080a7bd Michael Niedermayer
static int get_stream_idx(int *d){
826
    if(    d[0] >= '0' && d[0] <= '9'
827
        && d[1] >= '0' && d[1] <= '9'){
828
        return (d[0] - '0') * 10 + (d[1] - '0');
829
    }else{
830
        return 100; //invalid stream ID
831
    }
832
}
833
834 1101abfe Zdenek Kabelac
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
835 de6d9b64 Fabrice Bellard
{
836
    AVIContext *avi = s->priv_data;
837 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
838 f5007cc8 Michael Niedermayer
    int n, d[8];
839
    unsigned int size;
840 bc5c918e Diego Biurrun
    int64_t i, sync;
841 7458ccbb Roman Shaposhnik
    void* dstr;
842 115329f1 Diego Biurrun
843 49fb20cb Aurelien Jacobs
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
844 f5007cc8 Michael Niedermayer
        int size = dv_get_packet(avi->dv_demux, pkt);
845 bb270c08 Diego Biurrun
        if (size >= 0)
846
            return size;
847 2af7e610 Fabrice Bellard
    }
848 115329f1 Diego Biurrun
849 7c7f3866 Michael Niedermayer
    if(avi->non_interleaved){
850 79396ac6 Måns Rullgård
        int best_stream_index = 0;
851 7c7f3866 Michael Niedermayer
        AVStream *best_st= NULL;
852
        AVIStream *best_ast;
853
        int64_t best_ts= INT64_MAX;
854
        int i;
855 115329f1 Diego Biurrun
856 7c7f3866 Michael Niedermayer
        for(i=0; i<s->nb_streams; i++){
857
            AVStream *st = s->streams[i];
858
            AVIStream *ast = st->priv_data;
859
            int64_t ts= ast->frame_offset;
860 2c14ded3 Maksym Veremeyenko
            int64_t last_ts;
861 7c7f3866 Michael Niedermayer
862 b60de406 Maksym Veremeyenko
            if(!st->nb_index_entries)
863
                continue;
864
865 2c14ded3 Maksym Veremeyenko
            last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
866
            if(!ast->remaining && ts > last_ts)
867
                continue;
868
869 83a4d356 Michael Niedermayer
            ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
870 7c7f3866 Michael Niedermayer
871 87ad63c0 Benoit Fouet
//            av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
872 b60de406 Maksym Veremeyenko
            if(ts < best_ts){
873 7c7f3866 Michael Niedermayer
                best_ts= ts;
874
                best_st= st;
875
                best_stream_index= i;
876
            }
877
        }
878 fce88d52 Michael Niedermayer
        if(!best_st)
879
            return -1;
880
881 7c7f3866 Michael Niedermayer
        best_ast = best_st->priv_data;
882 83a4d356 Michael Niedermayer
        best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
883 7c7f3866 Michael Niedermayer
        if(best_ast->remaining)
884
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
885 25983dcd Michael Niedermayer
        else{
886 7c7f3866 Michael Niedermayer
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
887 25983dcd Michael Niedermayer
            if(i>=0)
888 83a4d356 Michael Niedermayer
                best_ast->frame_offset= best_st->index_entries[i].timestamp;
889 25983dcd Michael Niedermayer
        }
890 7c7f3866 Michael Niedermayer
891 87ad63c0 Benoit Fouet
//        av_log(s, AV_LOG_DEBUG, "%d\n", i);
892 7c7f3866 Michael Niedermayer
        if(i>=0){
893
            int64_t pos= best_st->index_entries[i].pos;
894 5c89153e Michael Niedermayer
            pos += best_ast->packet_size - best_ast->remaining;
895 6b4aa5da Anton Khirnov
            avio_seek(s->pb, pos + 8, SEEK_SET);
896 87ad63c0 Benoit Fouet
//        av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
897 115329f1 Diego Biurrun
898 8223bca5 Michael Niedermayer
            assert(best_ast->remaining <= best_ast->packet_size);
899
900 1894edeb Michael Niedermayer
            avi->stream_index= best_stream_index;
901
            if(!best_ast->remaining)
902 8223bca5 Michael Niedermayer
                best_ast->packet_size=
903 1894edeb Michael Niedermayer
                best_ast->remaining= best_st->index_entries[i].size;
904 7c7f3866 Michael Niedermayer
        }
905
    }
906 115329f1 Diego Biurrun
907 4a8d5135 Michael Niedermayer
resync:
908 7c7f3866 Michael Niedermayer
    if(avi->stream_index >= 0){
909
        AVStream *st= s->streams[ avi->stream_index ];
910
        AVIStream *ast= st->priv_data;
911 c60a0f85 Michael Niedermayer
        int size, err;
912 115329f1 Diego Biurrun
913 37287d41 Aurelien Jacobs
        if(get_subtitle_pkt(s, st, pkt))
914
            return 0;
915
916 e84dab5f Michael Niedermayer
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
917 7c7f3866 Michael Niedermayer
            size= INT_MAX;
918 115329f1 Diego Biurrun
        else if(ast->sample_size < 32)
919 28eb5773 Reimar Döffinger
            // arbitrary multiplier to avoid tiny packets for raw PCM data
920
            size= 1024*ast->sample_size;
921 7c7f3866 Michael Niedermayer
        else
922
            size= ast->sample_size;
923
924
        if(size > ast->remaining)
925
            size= ast->remaining;
926 7ccc636f Michael Niedermayer
        avi->last_pkt_pos= url_ftell(pb);
927 c60a0f85 Michael Niedermayer
        err= av_get_packet(pb, pkt, size);
928
        if(err<0)
929
            return err;
930 115329f1 Diego Biurrun
931 b7c40744 Michael Niedermayer
        if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
932 c60a0f85 Michael Niedermayer
            void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
933
            if(ptr){
934 b7c40744 Michael Niedermayer
            ast->has_pal=0;
935
            pkt->size += 4*256;
936 c60a0f85 Michael Niedermayer
            pkt->data= ptr;
937 b7c40744 Michael Niedermayer
                memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
938 c60a0f85 Michael Niedermayer
            }else
939
                av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
940 b7c40744 Michael Niedermayer
        }
941
942 49fb20cb Aurelien Jacobs
        if (CONFIG_DV_DEMUXER && avi->dv_demux) {
943 7c7f3866 Michael Niedermayer
            dstr = pkt->destruct;
944
            size = dv_produce_packet(avi->dv_demux, pkt,
945
                                    pkt->data, pkt->size);
946
            pkt->destruct = dstr;
947 cc947f04 Jean-Daniel Dupas
            pkt->flags |= AV_PKT_FLAG_KEY;
948 bbfb2c80 Jai Menon
            if (size < 0)
949
                av_free_packet(pkt);
950 37287d41 Aurelien Jacobs
        } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
951
                   && !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
952
            ast->frame_offset++;
953
            avi->stream_index = -1;
954
            ast->remaining = 0;
955
            goto resync;
956 7c7f3866 Michael Niedermayer
        } else {
957 15d6e361 Diego Biurrun
            /* XXX: How to handle B-frames in AVI? */
958 7c7f3866 Michael Niedermayer
            pkt->dts = ast->frame_offset;
959
//                pkt->dts += ast->start;
960
            if(ast->sample_size)
961
                pkt->dts /= ast->sample_size;
962 87ad63c0 Benoit Fouet
//av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
963 7c7f3866 Michael Niedermayer
            pkt->stream_index = avi->stream_index;
964
965 72415b2a Stefano Sabatini
            if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
966 4323b09d Michael Niedermayer
                AVIndexEntry *e;
967
                int index;
968 ded3c7da Michael Niedermayer
                assert(st->index_entries);
969 7c7f3866 Michael Niedermayer
970 83a4d356 Michael Niedermayer
                index= av_index_search_timestamp(st, ast->frame_offset, 0);
971 4323b09d Michael Niedermayer
                e= &st->index_entries[index];
972 115329f1 Diego Biurrun
973 4323b09d Michael Niedermayer
                if(index >= 0 && e->timestamp == ast->frame_offset){
974
                    if (e->flags & AVINDEX_KEYFRAME)
975 cc947f04 Jean-Daniel Dupas
                        pkt->flags |= AV_PKT_FLAG_KEY;
976 4323b09d Michael Niedermayer
                }
977 7c7f3866 Michael Niedermayer
            } else {
978 cc947f04 Jean-Daniel Dupas
                pkt->flags |= AV_PKT_FLAG_KEY;
979 7c7f3866 Michael Niedermayer
            }
980 8a472821 Michael Niedermayer
            ast->frame_offset += get_duration(ast, pkt->size);
981 7c7f3866 Michael Niedermayer
        }
982
        ast->remaining -= size;
983
        if(!ast->remaining){
984
            avi->stream_index= -1;
985
            ast->packet_size= 0;
986
        }
987
988
        return size;
989
    }
990
991 4a8d5135 Michael Niedermayer
    memset(d, -1, sizeof(int)*8);
992
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
993 df99755b Michael Niedermayer
        int j;
994 1101abfe Zdenek Kabelac
995 df99755b Michael Niedermayer
        for(j=0; j<7; j++)
996
            d[j]= d[j+1];
997 b7effd4e Anton Khirnov
        d[7]= avio_r8(pb);
998 115329f1 Diego Biurrun
999 df99755b Michael Niedermayer
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
1000 115329f1 Diego Biurrun
1001 f080a7bd Michael Niedermayer
        n= get_stream_idx(d+2);
1002 87ad63c0 Benoit Fouet
//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
1003 f5007cc8 Michael Niedermayer
        if(i + (uint64_t)size > avi->fsize || d[0]<0)
1004 d2c5f0a4 Michael Niedermayer
            continue;
1005 115329f1 Diego Biurrun
1006 d2c5f0a4 Michael Niedermayer
        //parse ix##
1007
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
1008 bb270c08 Diego Biurrun
        //parse JUNK
1009 bc3a73bc Michael Niedermayer
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
1010
           ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
1011 e356fc57 Anton Khirnov
            avio_seek(pb, size, SEEK_CUR);
1012 87ad63c0 Benoit Fouet
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
1013 4a8d5135 Michael Niedermayer
            goto resync;
1014 8f9298f8 Roman Shaposhnik
        }
1015 d2c5f0a4 Michael Niedermayer
1016 e471e3c4 Aurelien Jacobs
        //parse stray LIST
1017
        if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
1018 e356fc57 Anton Khirnov
            avio_seek(pb, 4, SEEK_CUR);
1019 e471e3c4 Aurelien Jacobs
            goto resync;
1020
        }
1021
1022 f080a7bd Michael Niedermayer
        n= get_stream_idx(d);
1023 115329f1 Diego Biurrun
1024 7ccc636f Michael Niedermayer
        if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
1025
            continue;
1026
1027 7305d97f Maksym Veremeyenko
        //detect ##ix chunk and skip
1028
        if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
1029 e356fc57 Anton Khirnov
            avio_seek(pb, size, SEEK_CUR);
1030 7305d97f Maksym Veremeyenko
            goto resync;
1031
        }
1032
1033 d2c5f0a4 Michael Niedermayer
        //parse ##dc/##wb
1034 80e3a08c Michael Niedermayer
        if(n < s->nb_streams){
1035 1ce50d32 Michael Niedermayer
            AVStream *st;
1036
            AVIStream *ast;
1037
            st = s->streams[n];
1038
            ast = st->priv_data;
1039 41757171 Michael Niedermayer
1040 79d6b9cb Michael Niedermayer
            if(s->nb_streams>=2){
1041
                AVStream *st1  = s->streams[1];
1042
                AVIStream *ast1= st1->priv_data;
1043 1ce50d32 Michael Niedermayer
                //workaround for broken small-file-bug402.avi
1044
                if(   d[2] == 'w' && d[3] == 'b'
1045
                   && n==0
1046 72415b2a Stefano Sabatini
                   && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
1047
                   && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
1048 1ce50d32 Michael Niedermayer
                   && ast->prefix == 'd'*256+'c'
1049
                   && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
1050
                  ){
1051
                    n=1;
1052
                    st = st1;
1053
                    ast = ast1;
1054 15d6e361 Diego Biurrun
                    av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
1055 1ce50d32 Michael Niedermayer
                }
1056 79d6b9cb Michael Niedermayer
            }
1057 41757171 Michael Niedermayer
1058
1059 1ce50d32 Michael Niedermayer
            if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
1060 cc947f04 Jean-Daniel Dupas
               /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
1061 1ce50d32 Michael Niedermayer
               || st->discard >= AVDISCARD_ALL){
1062 8a472821 Michael Niedermayer
                ast->frame_offset += get_duration(ast, size);
1063 e356fc57 Anton Khirnov
                avio_seek(pb, size, SEEK_CUR);
1064 b4aea108 Michael Niedermayer
                goto resync;
1065 1ce50d32 Michael Niedermayer
            }
1066 d2c5f0a4 Michael Niedermayer
1067 1ce50d32 Michael Niedermayer
            if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
1068 b7effd4e Anton Khirnov
                int k = avio_r8(pb);
1069
                int last = (k + avio_r8(pb) - 1) & 0xFF;
1070 b7c40744 Michael Niedermayer
1071 b7effd4e Anton Khirnov
                avio_rl16(pb); //flags
1072 b7c40744 Michael Niedermayer
1073
                for (; k <= last; k++)
1074 b7effd4e Anton Khirnov
                    ast->pal[k] = avio_rb32(pb)>>8;// b + (g << 8) + (r << 16);
1075 b7c40744 Michael Niedermayer
                ast->has_pal= 1;
1076
                goto resync;
1077 1ce50d32 Michael Niedermayer
            } else if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
1078
                         d[2]*256+d[3] == ast->prefix /*||
1079
                         (d[2] == 'd' && d[3] == 'c') ||
1080
                         (d[2] == 'w' && d[3] == 'b')*/) {
1081 d2c5f0a4 Michael Niedermayer
1082 87ad63c0 Benoit Fouet
//av_log(s, AV_LOG_DEBUG, "OK\n");
1083 1ce50d32 Michael Niedermayer
                if(d[2]*256+d[3] == ast->prefix)
1084
                    ast->prefix_count++;
1085
                else{
1086
                    ast->prefix= d[2]*256+d[3];
1087
                    ast->prefix_count= 0;
1088
                }
1089 d2c5f0a4 Michael Niedermayer
1090 1ce50d32 Michael Niedermayer
                avi->stream_index= n;
1091
                ast->packet_size= size + 8;
1092
                ast->remaining= size;
1093 ded3c7da Michael Niedermayer
1094 df84d7d9 Michael Niedermayer
                if(size || !ast->sample_size){
1095 1ce50d32 Michael Niedermayer
                    uint64_t pos= url_ftell(pb) - 8;
1096
                    if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
1097 83a4d356 Michael Niedermayer
                        av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
1098 1ce50d32 Michael Niedermayer
                    }
1099 ded3c7da Michael Niedermayer
                }
1100 1ce50d32 Michael Niedermayer
                goto resync;
1101 ded3c7da Michael Niedermayer
            }
1102 df99755b Michael Niedermayer
        }
1103
    }
1104 d2c5f0a4 Michael Niedermayer
1105 1e04bbee Peter Ross
    return AVERROR_EOF;
1106 de6d9b64 Fabrice Bellard
}
1107
1108 15d6e361 Diego Biurrun
/* XXX: We make the implicit supposition that the positions are sorted
1109
   for each stream. */
1110 155e9ee9 Fabrice Bellard
static int avi_read_idx1(AVFormatContext *s, int size)
1111
{
1112 7c7f3866 Michael Niedermayer
    AVIContext *avi = s->priv_data;
1113 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
1114 155e9ee9 Fabrice Bellard
    int nb_index_entries, i;
1115
    AVStream *st;
1116
    AVIStream *ast;
1117
    unsigned int index, tag, flags, pos, len;
1118 7c7f3866 Michael Niedermayer
    unsigned last_pos= -1;
1119 115329f1 Diego Biurrun
1120 155e9ee9 Fabrice Bellard
    nb_index_entries = size / 16;
1121
    if (nb_index_entries <= 0)
1122
        return -1;
1123
1124 15d6e361 Diego Biurrun
    /* Read the entries and sort them in each stream component. */
1125 155e9ee9 Fabrice Bellard
    for(i = 0; i < nb_index_entries; i++) {
1126 b7effd4e Anton Khirnov
        tag = avio_rl32(pb);
1127
        flags = avio_rl32(pb);
1128
        pos = avio_rl32(pb);
1129
        len = avio_rl32(pb);
1130 52a0bbff Michael Niedermayer
#if defined(DEBUG_SEEK)
1131 87ad63c0 Benoit Fouet
        av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
1132 155e9ee9 Fabrice Bellard
               i, tag, flags, pos, len);
1133
#endif
1134 7c7f3866 Michael Niedermayer
        if(i==0 && pos > avi->movi_list)
1135
            avi->movi_list= 0; //FIXME better check
1136 5c89153e Michael Niedermayer
        pos += avi->movi_list;
1137 7c7f3866 Michael Niedermayer
1138 155e9ee9 Fabrice Bellard
        index = ((tag & 0xff) - '0') * 10;
1139
        index += ((tag >> 8) & 0xff) - '0';
1140
        if (index >= s->nb_streams)
1141
            continue;
1142
        st = s->streams[index];
1143
        ast = st->priv_data;
1144 115329f1 Diego Biurrun
1145 52a0bbff Michael Niedermayer
#if defined(DEBUG_SEEK)
1146 87ad63c0 Benoit Fouet
        av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
1147 52a0bbff Michael Niedermayer
#endif
1148 8ebe099a Michael Niedermayer
        if(url_feof(pb))
1149
            return -1;
1150
1151 80e3a08c Michael Niedermayer
        if(last_pos == pos)
1152
            avi->non_interleaved= 1;
1153 df84d7d9 Michael Niedermayer
        else if(len || !ast->sample_size)
1154 83a4d356 Michael Niedermayer
            av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
1155 8a472821 Michael Niedermayer
        ast->cum_len += get_duration(ast, len);
1156 7c7f3866 Michael Niedermayer
        last_pos= pos;
1157 155e9ee9 Fabrice Bellard
    }
1158
    return 0;
1159
}
1160
1161 7c7f3866 Michael Niedermayer
static int guess_ni_flag(AVFormatContext *s){
1162
    int i;
1163
    int64_t last_start=0;
1164
    int64_t first_end= INT64_MAX;
1165 8c68f25b Michael Niedermayer
    int64_t oldpos= url_ftell(s->pb);
1166 115329f1 Diego Biurrun
1167 7c7f3866 Michael Niedermayer
    for(i=0; i<s->nb_streams; i++){
1168
        AVStream *st = s->streams[i];
1169
        int n= st->nb_index_entries;
1170 8c68f25b Michael Niedermayer
        unsigned int size;
1171 7c7f3866 Michael Niedermayer
1172
        if(n <= 0)
1173
            continue;
1174
1175 8c68f25b Michael Niedermayer
        if(n >= 2){
1176
            int64_t pos= st->index_entries[0].pos;
1177 6b4aa5da Anton Khirnov
            avio_seek(s->pb, pos + 4, SEEK_SET);
1178 b7effd4e Anton Khirnov
            size= avio_rl32(s->pb);
1179 8c68f25b Michael Niedermayer
            if(pos + size > st->index_entries[1].pos)
1180
                last_start= INT64_MAX;
1181
        }
1182
1183 7c7f3866 Michael Niedermayer
        if(st->index_entries[0].pos > last_start)
1184
            last_start= st->index_entries[0].pos;
1185
        if(st->index_entries[n-1].pos < first_end)
1186
            first_end= st->index_entries[n-1].pos;
1187
    }
1188 6b4aa5da Anton Khirnov
    avio_seek(s->pb, oldpos, SEEK_SET);
1189 7c7f3866 Michael Niedermayer
    return last_start > first_end;
1190
}
1191
1192 155e9ee9 Fabrice Bellard
static int avi_load_index(AVFormatContext *s)
1193
{
1194
    AVIContext *avi = s->priv_data;
1195 ae628ec1 Anton Khirnov
    AVIOContext *pb = s->pb;
1196 155e9ee9 Fabrice Bellard
    uint32_t tag, size;
1197 bc5c918e Diego Biurrun
    int64_t pos= url_ftell(pb);
1198 44ed34b7 Reimar Döffinger
    int ret = -1;
1199 115329f1 Diego Biurrun
1200 6b4aa5da Anton Khirnov
    if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
1201 44ed34b7 Reimar Döffinger
        goto the_end; // maybe truncated file
1202 155e9ee9 Fabrice Bellard
#ifdef DEBUG_SEEK
1203 949b1a13 Steve L'Homme
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
1204 155e9ee9 Fabrice Bellard
#endif
1205
    for(;;) {
1206
        if (url_feof(pb))
1207
            break;
1208 b7effd4e Anton Khirnov
        tag = avio_rl32(pb);
1209
        size = avio_rl32(pb);
1210 155e9ee9 Fabrice Bellard
#ifdef DEBUG_SEEK
1211
        printf("tag=%c%c%c%c size=0x%x\n",
1212
               tag & 0xff,
1213
               (tag >> 8) & 0xff,
1214
               (tag >> 16) & 0xff,
1215
               (tag >> 24) & 0xff,
1216
               size);
1217
#endif
1218
        switch(tag) {
1219
        case MKTAG('i', 'd', 'x', '1'):
1220
            if (avi_read_idx1(s, size) < 0)
1221
                goto skip;
1222 44ed34b7 Reimar Döffinger
            ret = 0;
1223 155e9ee9 Fabrice Bellard
                goto the_end;
1224
            break;
1225
        default:
1226
        skip:
1227
            size += (size & 1);
1228 6b4aa5da Anton Khirnov
            if (avio_seek(pb, size, SEEK_CUR) < 0)
1229 44ed34b7 Reimar Döffinger
                goto the_end; // something is wrong here
1230 155e9ee9 Fabrice Bellard
            break;
1231
        }
1232
    }
1233
 the_end:
1234 6b4aa5da Anton Khirnov
    avio_seek(pb, pos, SEEK_SET);
1235 44ed34b7 Reimar Döffinger
    return ret;
1236 155e9ee9 Fabrice Bellard
}
1237
1238 37287d41 Aurelien Jacobs
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
1239
{
1240
    AVIStream *ast2 = st2->priv_data;
1241
    int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
1242
    av_free_packet(&ast2->sub_pkt);
1243
    if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
1244
        avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
1245
        av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
1246
}
1247
1248 7b3c1382 Michael Niedermayer
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
1249 155e9ee9 Fabrice Bellard
{
1250
    AVIContext *avi = s->priv_data;
1251
    AVStream *st;
1252 52a0bbff Michael Niedermayer
    int i, index;
1253 155e9ee9 Fabrice Bellard
    int64_t pos;
1254 83a4d356 Michael Niedermayer
    AVIStream *ast;
1255 155e9ee9 Fabrice Bellard
1256
    if (!avi->index_loaded) {
1257
        /* we only load the index on demand */
1258
        avi_load_index(s);
1259
        avi->index_loaded = 1;
1260
    }
1261 52a0bbff Michael Niedermayer
    assert(stream_index>= 0);
1262 155e9ee9 Fabrice Bellard
1263
    st = s->streams[stream_index];
1264 83a4d356 Michael Niedermayer
    ast= st->priv_data;
1265
    index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
1266 52a0bbff Michael Niedermayer
    if(index<0)
1267 155e9ee9 Fabrice Bellard
        return -1;
1268 115329f1 Diego Biurrun
1269 155e9ee9 Fabrice Bellard
    /* find the position */
1270 52a0bbff Michael Niedermayer
    pos = st->index_entries[index].pos;
1271 83a4d356 Michael Niedermayer
    timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
1272 52a0bbff Michael Niedermayer
1273 87ad63c0 Benoit Fouet
//    av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
1274 155e9ee9 Fabrice Bellard
1275 49fb20cb Aurelien Jacobs
    if (CONFIG_DV_DEMUXER && avi->dv_demux) {
1276 6eb2de74 Roman Shaposhnik
        /* One and only one real stream for DV in AVI, and it has video  */
1277 f4433de9 Diego Biurrun
        /* offsets. Calling with other stream indexes should have failed */
1278 6eb2de74 Roman Shaposhnik
        /* the av_index_search_timestamp call above.                     */
1279
        assert(stream_index == 0);
1280
1281
        /* Feed the DV video stream version of the timestamp to the */
1282 15d6e361 Diego Biurrun
        /* DV demux so it can synthesize correct timestamps.        */
1283 6eb2de74 Roman Shaposhnik
        dv_offset_reset(avi->dv_demux, timestamp);
1284
1285 6b4aa5da Anton Khirnov
        avio_seek(s->pb, pos, SEEK_SET);
1286 6eb2de74 Roman Shaposhnik
        avi->stream_index= -1;
1287
        return 0;
1288
    }
1289
1290 155e9ee9 Fabrice Bellard
    for(i = 0; i < s->nb_streams; i++) {
1291 52a0bbff Michael Niedermayer
        AVStream *st2 = s->streams[i];
1292
        AVIStream *ast2 = st2->priv_data;
1293 7c7f3866 Michael Niedermayer
1294
        ast2->packet_size=
1295
        ast2->remaining= 0;
1296
1297 37287d41 Aurelien Jacobs
        if (ast2->sub_ctx) {
1298
            seek_subtitle(st, st2, timestamp);
1299
            continue;
1300
        }
1301
1302 52a0bbff Michael Niedermayer
        if (st2->nb_index_entries <= 0)
1303
            continue;
1304 115329f1 Diego Biurrun
1305 e84dab5f Michael Niedermayer
//        assert(st2->codec->block_align);
1306 62f25230 Baptiste Coudurier
        assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
1307 52a0bbff Michael Niedermayer
        index = av_index_search_timestamp(
1308 115329f1 Diego Biurrun
                st2,
1309 83a4d356 Michael Niedermayer
                av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
1310 52a0bbff Michael Niedermayer
                flags | AVSEEK_FLAG_BACKWARD);
1311
        if(index<0)
1312
            index=0;
1313 115329f1 Diego Biurrun
1314 7c7f3866 Michael Niedermayer
        if(!avi->non_interleaved){
1315
            while(index>0 && st2->index_entries[index].pos > pos)
1316
                index--;
1317
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
1318
                index++;
1319
        }
1320
1321 87ad63c0 Benoit Fouet
//        av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
1322 52a0bbff Michael Niedermayer
        /* extract the current frame number */
1323
        ast2->frame_offset = st2->index_entries[index].timestamp;
1324 155e9ee9 Fabrice Bellard
    }
1325 52a0bbff Michael Niedermayer
1326 155e9ee9 Fabrice Bellard
    /* do the seek */
1327 6b4aa5da Anton Khirnov
    avio_seek(s->pb, pos, SEEK_SET);
1328 7c7f3866 Michael Niedermayer
    avi->stream_index= -1;
1329 155e9ee9 Fabrice Bellard
    return 0;
1330
}
1331
1332 1101abfe Zdenek Kabelac
static int avi_read_close(AVFormatContext *s)
1333 de6d9b64 Fabrice Bellard
{
1334 5ae2c73e Michael Niedermayer
    int i;
1335
    AVIContext *avi = s->priv_data;
1336
1337
    for(i=0;i<s->nb_streams;i++) {
1338
        AVStream *st = s->streams[i];
1339 37287d41 Aurelien Jacobs
        AVIStream *ast = st->priv_data;
1340 01f4895c Michael Niedermayer
        av_free(st->codec->palctrl);
1341 4ed899f2 Andrew Wason
        if (ast) {
1342 2b50c4f6 Carl Eugen Hoyos
            if (ast->sub_ctx) {
1343
                av_freep(&ast->sub_ctx->pb);
1344
                av_close_input_stream(ast->sub_ctx);
1345
            }
1346
            av_free(ast->sub_buffer);
1347
            av_free_packet(&ast->sub_pkt);
1348 4ed899f2 Andrew Wason
        }
1349 5ae2c73e Michael Niedermayer
    }
1350
1351 290849e2 Clément Bœsch
    av_free(avi->dv_demux);
1352 7458ccbb Roman Shaposhnik
1353 c9a65ca8 Fabrice Bellard
    return 0;
1354
}
1355
1356
static int avi_probe(AVProbeData *p)
1357
{
1358 7b31b092 Aurelien Jacobs
    int i;
1359
1360 c9a65ca8 Fabrice Bellard
    /* check file header */
1361 7b31b092 Aurelien Jacobs
    for(i=0; avi_headers[i][0]; i++)
1362
        if(!memcmp(p->buf  , avi_headers[i]  , 4) &&
1363
           !memcmp(p->buf+8, avi_headers[i]+4, 4))
1364
            return AVPROBE_SCORE_MAX;
1365
1366
    return 0;
1367 c9a65ca8 Fabrice Bellard
}
1368
1369 c6610a21 Diego Elio Pettenò
AVInputFormat ff_avi_demuxer = {
1370 c9a65ca8 Fabrice Bellard
    "avi",
1371 bde15e74 Stefano Sabatini
    NULL_IF_CONFIG_SMALL("AVI format"),
1372 c9a65ca8 Fabrice Bellard
    sizeof(AVIContext),
1373
    avi_probe,
1374
    avi_read_header,
1375
    avi_read_packet,
1376
    avi_read_close,
1377 155e9ee9 Fabrice Bellard
    avi_read_seek,
1378 c9a65ca8 Fabrice Bellard
};