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ffmpeg / libavformat / avidec.c @ 54a5c719

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1 de6d9b64 Fabrice Bellard
/*
2 7fbde343 Aurelien Jacobs
 * AVI demuxer
3 19720f15 Fabrice Bellard
 * 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
#include "avformat.h"
22
#include "avi.h"
23 7458ccbb Roman Shaposhnik
#include "dv.h"
24 9d9f4119 Måns Rullgård
#include "riff.h"
25 de6d9b64 Fabrice Bellard
26 52a0bbff Michael Niedermayer
#undef NDEBUG
27
#include <assert.h>
28
29 de6d9b64 Fabrice Bellard
//#define DEBUG
30 155e9ee9 Fabrice Bellard
//#define DEBUG_SEEK
31
32
typedef struct AVIStream {
33 7c7f3866 Michael Niedermayer
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
34 155e9ee9 Fabrice Bellard
                         (used to compute the pts) */
35 7c7f3866 Michael Niedermayer
    int remaining;
36
    int packet_size;
37
38 155e9ee9 Fabrice Bellard
    int scale;
39 115329f1 Diego Biurrun
    int rate;
40 8223bca5 Michael Niedermayer
    int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
41 115329f1 Diego Biurrun
42 94d1d6c0 Michael Niedermayer
    int64_t cum_len; /* temporary storage (used during seek) */
43 115329f1 Diego Biurrun
44 d2c5f0a4 Michael Niedermayer
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
45
    int prefix_count;
46 155e9ee9 Fabrice Bellard
} AVIStream;
47 de6d9b64 Fabrice Bellard
48
typedef struct {
49 7458ccbb Roman Shaposhnik
    int64_t  riff_end;
50
    int64_t  movi_end;
51 de6d9b64 Fabrice Bellard
    offset_t movi_list;
52 155e9ee9 Fabrice Bellard
    int index_loaded;
53 8f9298f8 Roman Shaposhnik
    int is_odml;
54 7c7f3866 Michael Niedermayer
    int non_interleaved;
55
    int stream_index;
56 ddaae6a9 Roman Shaposhnik
    DVDemuxContext* dv_demux;
57 de6d9b64 Fabrice Bellard
} AVIContext;
58
59 42feef6b Michael Niedermayer
static int avi_load_index(AVFormatContext *s);
60 30a43f2d Michael Niedermayer
static int guess_ni_flag(AVFormatContext *s);
61 42feef6b Michael Niedermayer
62 de6d9b64 Fabrice Bellard
#ifdef DEBUG
63 1101abfe Zdenek Kabelac
static void print_tag(const char *str, unsigned int tag, int size)
64 de6d9b64 Fabrice Bellard
{
65
    printf("%s: tag=%c%c%c%c size=0x%x\n",
66
           str, tag & 0xff,
67
           (tag >> 8) & 0xff,
68
           (tag >> 16) & 0xff,
69
           (tag >> 24) & 0xff,
70
           size);
71
}
72
#endif
73
74 06219cb1 Roman Shaposhnik
static int get_riff(AVIContext *avi, ByteIOContext *pb)
75
{
76 115329f1 Diego Biurrun
    uint32_t tag;
77 06219cb1 Roman Shaposhnik
    /* check RIFF header */
78
    tag = get_le32(pb);
79
80
    if (tag != MKTAG('R', 'I', 'F', 'F'))
81
        return -1;
82
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
83
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
84
    tag = get_le32(pb);
85 d09ea618 Michael Niedermayer
    if(tag == MKTAG('A', 'V', 'I', 0x19))
86
        av_log(NULL, AV_LOG_INFO, "file has been generated with a totally broken muxer\n");
87
    else
88 06219cb1 Roman Shaposhnik
    if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
89
        return -1;
90 115329f1 Diego Biurrun
91 06219cb1 Roman Shaposhnik
    return 0;
92
}
93
94 94d1d6c0 Michael Niedermayer
static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
95 8945ebb9 Michael Niedermayer
    AVIContext *avi = s->priv_data;
96 94d1d6c0 Michael Niedermayer
    ByteIOContext *pb = &s->pb;
97
    int longs_pre_entry= get_le16(pb);
98
    int index_sub_type = get_byte(pb);
99
    int index_type     = get_byte(pb);
100
    int entries_in_use = get_le32(pb);
101
    int chunk_id       = get_le32(pb);
102
    int64_t base       = get_le64(pb);
103
    int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
104
    AVStream *st;
105
    AVIStream *ast;
106
    int i;
107 8945ebb9 Michael Niedermayer
    int64_t last_pos= -1;
108 965a63af Michael Niedermayer
    int64_t filesize= url_fsize(&s->pb);
109 94d1d6c0 Michael Niedermayer
110 965a63af Michael Niedermayer
#ifdef DEBUG_SEEK
111 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",
112 965a63af Michael Niedermayer
        longs_pre_entry,index_type, entries_in_use, chunk_id, base);
113
#endif
114 94d1d6c0 Michael Niedermayer
115
    if(stream_id > s->nb_streams || stream_id < 0)
116
        return -1;
117
    st= s->streams[stream_id];
118
    ast = st->priv_data;
119
120
    if(index_sub_type)
121
        return -1;
122
123
    get_le32(pb);
124
125
    if(index_type && longs_pre_entry != 2)
126
        return -1;
127
    if(index_type>1)
128
        return -1;
129
130 965a63af Michael Niedermayer
    if(filesize > 0 && base >= filesize){
131
        av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
132
        if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
133
            base &= 0xFFFFFFFF;
134
        else
135
            return -1;
136
    }
137
138 94d1d6c0 Michael Niedermayer
    for(i=0; i<entries_in_use; i++){
139
        if(index_type){
140 30a43f2d Michael Niedermayer
            int64_t pos= get_le32(pb) + base - 8;
141 94d1d6c0 Michael Niedermayer
            int len    = get_le32(pb);
142 30a43f2d Michael Niedermayer
            int key= len >= 0;
143 94d1d6c0 Michael Niedermayer
            len &= 0x7FFFFFFF;
144
145 965a63af Michael Niedermayer
#ifdef DEBUG_SEEK
146 949b1a13 Steve L'Homme
            av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
147 965a63af Michael Niedermayer
#endif
148 8945ebb9 Michael Niedermayer
            if(last_pos == pos || pos == base - 8)
149
                avi->non_interleaved= 1;
150
            else
151 2b70eb2b Michael Niedermayer
                av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0);
152 30a43f2d Michael Niedermayer
153 94d1d6c0 Michael Niedermayer
            if(ast->sample_size)
154 2b70eb2b Michael Niedermayer
                ast->cum_len += len;
155 94d1d6c0 Michael Niedermayer
            else
156
                ast->cum_len ++;
157 8945ebb9 Michael Niedermayer
            last_pos= pos;
158 94d1d6c0 Michael Niedermayer
        }else{
159 26b89135 Måns Rullgård
            int64_t offset, pos;
160
            int duration;
161
            offset = get_le64(pb);
162
            get_le32(pb);       /* size */
163
            duration = get_le32(pb);
164
            pos = url_ftell(pb);
165 94d1d6c0 Michael Niedermayer
166
            url_fseek(pb, offset+8, SEEK_SET);
167
            read_braindead_odml_indx(s, frame_num);
168
            frame_num += duration;
169
170
            url_fseek(pb, pos, SEEK_SET);
171
        }
172
    }
173 965a63af Michael Niedermayer
    avi->index_loaded=1;
174 94d1d6c0 Michael Niedermayer
    return 0;
175
}
176
177 115e8ae5 Michael Niedermayer
static void clean_index(AVFormatContext *s){
178 965a63af Michael Niedermayer
    int i;
179
    int64_t j;
180 115e8ae5 Michael Niedermayer
181
    for(i=0; i<s->nb_streams; i++){
182
        AVStream *st = s->streams[i];
183
        AVIStream *ast = st->priv_data;
184
        int n= st->nb_index_entries;
185
        int max= ast->sample_size;
186
        int64_t pos, size, ts;
187
188
        if(n != 1 || ast->sample_size==0)
189
            continue;
190
191
        while(max < 1024) max+=max;
192
193
        pos= st->index_entries[0].pos;
194
        size= st->index_entries[0].size;
195
        ts= st->index_entries[0].timestamp;
196
197
        for(j=0; j<size; j+=max){
198
            av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
199
        }
200
    }
201
}
202
203 57060f89 David Conrad
static int avi_read_tag(ByteIOContext *pb, char *buf, int maxlen,  unsigned int size)
204
{
205
    offset_t i = url_ftell(pb);
206
    size += (size & 1);
207
    get_strz(pb, buf, maxlen);
208
    url_fseek(pb, i+size, SEEK_SET);
209
    return 0;
210
}
211
212 1101abfe Zdenek Kabelac
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
213 de6d9b64 Fabrice Bellard
{
214 c9a65ca8 Fabrice Bellard
    AVIContext *avi = s->priv_data;
215 de6d9b64 Fabrice Bellard
    ByteIOContext *pb = &s->pb;
216 deb0a292 Roman Shaposhnik
    uint32_t tag, tag1, handler;
217 b53f1064 Michael Niedermayer
    int codec_type, stream_index, frame_period, bit_rate;
218 247eadca Fabrice Bellard
    unsigned int size, nb_frames;
219 6d29fba9 Michael Niedermayer
    int i;
220 de6d9b64 Fabrice Bellard
    AVStream *st;
221 26b89135 Måns Rullgård
    AVIStream *ast = NULL;
222 2ad4648f Panagiotis Issaris
    char str_track[4];
223 de6d9b64 Fabrice Bellard
224 7c7f3866 Michael Niedermayer
    avi->stream_index= -1;
225 115329f1 Diego Biurrun
226 06219cb1 Roman Shaposhnik
    if (get_riff(avi, pb) < 0)
227 de6d9b64 Fabrice Bellard
        return -1;
228 1101abfe Zdenek Kabelac
229 de6d9b64 Fabrice Bellard
    /* first list tag */
230
    stream_index = -1;
231
    codec_type = -1;
232
    frame_period = 0;
233
    for(;;) {
234
        if (url_feof(pb))
235
            goto fail;
236
        tag = get_le32(pb);
237
        size = get_le32(pb);
238
#ifdef DEBUG
239
        print_tag("tag", tag, size);
240
#endif
241
242
        switch(tag) {
243
        case MKTAG('L', 'I', 'S', 'T'):
244
            /* ignored, except when start of video packets */
245
            tag1 = get_le32(pb);
246
#ifdef DEBUG
247
            print_tag("list", tag1, 0);
248
#endif
249
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
250 155e9ee9 Fabrice Bellard
                avi->movi_list = url_ftell(pb) - 4;
251 2064c77a David Conrad
                if(size) avi->movi_end = avi->movi_list + size + (size & 1);
252 a965c478 Aurelien Jacobs
                else     avi->movi_end = url_fsize(pb);
253 de6d9b64 Fabrice Bellard
#ifdef DEBUG
254 949b1a13 Steve L'Homme
                printf("movi end=%"PRIx64"\n", avi->movi_end);
255 de6d9b64 Fabrice Bellard
#endif
256
                goto end_of_header;
257
            }
258
            break;
259 8f9298f8 Roman Shaposhnik
        case MKTAG('d', 'm', 'l', 'h'):
260 bb270c08 Diego Biurrun
            avi->is_odml = 1;
261
            url_fskip(pb, size + (size & 1));
262
            break;
263 de6d9b64 Fabrice Bellard
        case MKTAG('a', 'v', 'i', 'h'):
264 bb270c08 Diego Biurrun
            /* avi header */
265 1101abfe Zdenek Kabelac
            /* using frame_period is bad idea */
266 de6d9b64 Fabrice Bellard
            frame_period = get_le32(pb);
267
            bit_rate = get_le32(pb) * 8;
268 1894edeb Michael Niedermayer
            get_le32(pb);
269
            avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
270
271
            url_fskip(pb, 2 * 4);
272 6d29fba9 Michael Niedermayer
            get_le32(pb);
273
274
            url_fskip(pb, size - 7 * 4);
275
            break;
276
        case MKTAG('s', 't', 'r', 'h'):
277
            /* stream header */
278
279
            tag1 = get_le32(pb);
280
            handler = get_le32(pb); /* codec tag */
281
282
            if(tag1 == MKTAG('p', 'a', 'd', 's')){
283
                url_fskip(pb, size - 8);
284
                break;
285
            }else{
286
                stream_index++;
287
                st = av_new_stream(s, stream_index);
288 de6d9b64 Fabrice Bellard
                if (!st)
289
                    goto fail;
290 9ee91c2f Michael Niedermayer
291 155e9ee9 Fabrice Bellard
                ast = av_mallocz(sizeof(AVIStream));
292
                if (!ast)
293
                    goto fail;
294
                st->priv_data = ast;
295 bb270c08 Diego Biurrun
            }
296 6d29fba9 Michael Niedermayer
297 cc11e2b3 Michael Niedermayer
#ifdef DEBUG
298 e344c1ea Steve L'Homme
            print_tag("strh", tag1, -1);
299 cc11e2b3 Michael Niedermayer
#endif
300 b53f1064 Michael Niedermayer
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
301 6eb2de74 Roman Shaposhnik
                int64_t dv_dur;
302
303 115329f1 Diego Biurrun
                /*
304 bb270c08 Diego Biurrun
                 * After some consideration -- I don't think we
305
                 * have to support anything but DV in a type1 AVIs.
306
                 */
307
                if (s->nb_streams != 1)
308
                    goto fail;
309
310
                if (handler != MKTAG('d', 'v', 's', 'd') &&
311
                    handler != MKTAG('d', 'v', 'h', 'd') &&
312
                    handler != MKTAG('d', 'v', 's', 'l'))
313
                   goto fail;
314
315
                ast = s->streams[0]->priv_data;
316
                av_freep(&s->streams[0]->codec->extradata);
317
                av_freep(&s->streams[0]);
318
                s->nb_streams = 0;
319 a2a6332b Aurelien Jacobs
                if (ENABLE_DV_DEMUXER) {
320 38ca53da Aurelien Jacobs
                    avi->dv_demux = dv_init_demux(s);
321
                    if (!avi->dv_demux)
322
                        goto fail;
323 a2a6332b Aurelien Jacobs
                }
324 bb270c08 Diego Biurrun
                s->streams[0]->priv_data = ast;
325
                url_fskip(pb, 3 * 4);
326
                ast->scale = get_le32(pb);
327
                ast->rate = get_le32(pb);
328 6eb2de74 Roman Shaposhnik
                url_fskip(pb, 4);  /* start time */
329
330
                dv_dur = get_le32(pb);
331
                if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
332
                    dv_dur *= AV_TIME_BASE;
333
                    s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
334
                }
335
                /*
336
                 * else, leave duration alone; timing estimation in utils.c
337
                 *      will make a guess based on bit rate.
338
                 */
339
340 bb270c08 Diego Biurrun
                stream_index = s->nb_streams - 1;
341 6eb2de74 Roman Shaposhnik
                url_fskip(pb, size - 9*4);
342 b53f1064 Michael Niedermayer
                break;
343
            }
344 b559b29b Michael Niedermayer
345 6d29fba9 Michael Niedermayer
            assert(stream_index < s->nb_streams);
346 01f4895c Michael Niedermayer
            st->codec->stream_codec_tag= handler;
347 b559b29b Michael Niedermayer
348 b53f1064 Michael Niedermayer
            get_le32(pb); /* flags */
349
            get_le16(pb); /* priority */
350
            get_le16(pb); /* language */
351
            get_le32(pb); /* initial frame */
352
            ast->scale = get_le32(pb);
353
            ast->rate = get_le32(pb);
354
            if(ast->scale && ast->rate){
355
            }else if(frame_period){
356
                ast->rate = 1000000;
357
                ast->scale = frame_period;
358
            }else{
359
                ast->rate = 25;
360
                ast->scale = 1;
361
            }
362
            av_set_pts_info(st, 64, ast->scale, ast->rate);
363 115329f1 Diego Biurrun
364 b72a2bc8 Michael Niedermayer
            ast->cum_len=get_le32(pb); /* start */
365 b53f1064 Michael Niedermayer
            nb_frames = get_le32(pb);
366 b559b29b Michael Niedermayer
367 b53f1064 Michael Niedermayer
            st->start_time = 0;
368 c0df9d75 Michael Niedermayer
            st->duration = nb_frames;
369 b53f1064 Michael Niedermayer
            get_le32(pb); /* buffer size */
370
            get_le32(pb); /* quality */
371
            ast->sample_size = get_le32(pb); /* sample ssize */
372 2b70eb2b Michael Niedermayer
            ast->cum_len *= FFMAX(1, ast->sample_size);
373 b53f1064 Michael Niedermayer
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
374 247eadca Fabrice Bellard
375 b53f1064 Michael Niedermayer
            switch(tag1) {
376 bb270c08 Diego Biurrun
            case MKTAG('v', 'i', 'd', 's'):
377 b53f1064 Michael Niedermayer
                codec_type = CODEC_TYPE_VIDEO;
378 247eadca Fabrice Bellard
379 b53f1064 Michael Niedermayer
                ast->sample_size = 0;
380
                break;
381
            case MKTAG('a', 'u', 'd', 's'):
382
                codec_type = CODEC_TYPE_AUDIO;
383 9bf9a5fc Michael Niedermayer
                break;
384 cc11e2b3 Michael Niedermayer
            case MKTAG('t', 'x', 't', 's'):
385 115329f1 Diego Biurrun
                //FIXME
386 cc11e2b3 Michael Niedermayer
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
387
                break;
388 9bf9a5fc Michael Niedermayer
            default:
389 30667f42 Michael Niedermayer
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
390 9bf9a5fc Michael Niedermayer
                goto fail;
391 de6d9b64 Fabrice Bellard
            }
392 2b70eb2b Michael Niedermayer
            ast->frame_offset= ast->cum_len;
393 b53f1064 Michael Niedermayer
            url_fskip(pb, size - 12 * 4);
394 de6d9b64 Fabrice Bellard
            break;
395
        case MKTAG('s', 't', 'r', 'f'):
396
            /* stream header */
397 6d29fba9 Michael Niedermayer
            if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
398 de6d9b64 Fabrice Bellard
                url_fskip(pb, size);
399
            } else {
400
                st = s->streams[stream_index];
401
                switch(codec_type) {
402
                case CODEC_TYPE_VIDEO:
403
                    get_le32(pb); /* size */
404 01f4895c Michael Niedermayer
                    st->codec->width = get_le32(pb);
405
                    st->codec->height = get_le32(pb);
406 de6d9b64 Fabrice Bellard
                    get_le16(pb); /* panes */
407 01f4895c Michael Niedermayer
                    st->codec->bits_per_sample= get_le16(pb); /* depth */
408 de6d9b64 Fabrice Bellard
                    tag1 = get_le32(pb);
409 b559b29b Michael Niedermayer
                    get_le32(pb); /* ImageSize */
410
                    get_le32(pb); /* XPelsPerMeter */
411
                    get_le32(pb); /* YPelsPerMeter */
412
                    get_le32(pb); /* ClrUsed */
413
                    get_le32(pb); /* ClrImportant */
414
415 e344c1ea Steve L'Homme
                    if(size > 10*4 && size<(1<<30)){
416
                        st->codec->extradata_size= size - 10*4;
417
                        st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
418
                        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
419
                    }
420 115329f1 Diego Biurrun
421 01f4895c Michael Niedermayer
                    if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
422 952c69c4 Michael Niedermayer
                        get_byte(pb);
423 b559b29b Michael Niedermayer
424 5e29abf8 Roberto Togni
                    /* Extract palette from extradata if bpp <= 8 */
425
                    /* This code assumes that extradata contains only palette */
426
                    /* This is true for all paletted codecs implemented in ffmpeg */
427 01f4895c Michael Niedermayer
                    if (st->codec->extradata_size && (st->codec->bits_per_sample <= 8)) {
428
                        st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
429 5e29abf8 Roberto Togni
#ifdef WORDS_BIGENDIAN
430 01f4895c Michael Niedermayer
                        for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
431
                            st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
432 5e29abf8 Roberto Togni
#else
433 01f4895c Michael Niedermayer
                        memcpy(st->codec->palctrl->palette, st->codec->extradata,
434
                               FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
435 5e29abf8 Roberto Togni
#endif
436 01f4895c Michael Niedermayer
                        st->codec->palctrl->palette_changed = 1;
437 5e29abf8 Roberto Togni
                    }
438
439 de6d9b64 Fabrice Bellard
#ifdef DEBUG
440
                    print_tag("video", tag1, 0);
441
#endif
442 01f4895c Michael Niedermayer
                    st->codec->codec_type = CODEC_TYPE_VIDEO;
443
                    st->codec->codec_tag = tag1;
444
                    st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
445 57004ff1 Aurelien Jacobs
                    st->need_parsing = AVSTREAM_PARSE_HEADERS; // this is needed to get the pict type which is needed for generating correct pts
446 b559b29b Michael Niedermayer
//                    url_fskip(pb, size - 5 * 4);
447 de6d9b64 Fabrice Bellard
                    break;
448 9bf9a5fc Michael Niedermayer
                case CODEC_TYPE_AUDIO:
449 01f4895c Michael Niedermayer
                    get_wav_header(pb, st->codec, size);
450 e84dab5f Michael Niedermayer
                    if(ast->sample_size && st->codec->block_align && ast->sample_size % st->codec->block_align)
451
                        av_log(s, AV_LOG_DEBUG, "invalid sample size or block align detected\n");
452 1cef9527 François Revol
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
453
                        url_fskip(pb, 1);
454 5836d158 Diego Biurrun
                    /* Force parsing as several audio frames can be in
455 a74008a4 Joakim Plate
                     * one packet and timestamps refer to packet start*/
456
                    st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
457 cbee7a69 Baptiste Coudurier
                    /* ADTS header is in extradata, AAC without header must be stored as exact frames, parser not needed and it will fail */
458
                    if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
459 57004ff1 Aurelien Jacobs
                        st->need_parsing = AVSTREAM_PARSE_NONE;
460 8662900b Diego Biurrun
                    /* AVI files with Xan DPCM audio (wrongly) declare PCM
461
                     * audio in the header but have Axan as stream_code_tag. */
462
                    if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){
463
                        st->codec->codec_id  = CODEC_ID_XAN_DPCM;
464
                        st->codec->codec_tag = 0;
465
                    }
466 de6d9b64 Fabrice Bellard
                    break;
467
                default:
468 01f4895c Michael Niedermayer
                    st->codec->codec_type = CODEC_TYPE_DATA;
469
                    st->codec->codec_id= CODEC_ID_NONE;
470
                    st->codec->codec_tag= 0;
471 de6d9b64 Fabrice Bellard
                    url_fskip(pb, size);
472
                    break;
473
                }
474
            }
475
            break;
476 94d1d6c0 Michael Niedermayer
        case MKTAG('i', 'n', 'd', 'x'):
477
            i= url_ftell(pb);
478 2c00106c Michael Niedermayer
            if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
479 b7b22558 Michael Niedermayer
                read_braindead_odml_indx(s, 0);
480
            }
481 94d1d6c0 Michael Niedermayer
            url_fseek(pb, i+size, SEEK_SET);
482
            break;
483 57060f89 David Conrad
        case MKTAG('I', 'N', 'A', 'M'):
484
            avi_read_tag(pb, s->title, sizeof(s->title), size);
485
            break;
486
        case MKTAG('I', 'A', 'R', 'T'):
487
            avi_read_tag(pb, s->author, sizeof(s->author), size);
488
            break;
489
        case MKTAG('I', 'C', 'O', 'P'):
490
            avi_read_tag(pb, s->copyright, sizeof(s->copyright), size);
491
            break;
492
        case MKTAG('I', 'C', 'M', 'T'):
493
            avi_read_tag(pb, s->comment, sizeof(s->comment), size);
494
            break;
495
        case MKTAG('I', 'G', 'N', 'R'):
496
            avi_read_tag(pb, s->genre, sizeof(s->genre), size);
497
            break;
498 f0861f46 Panagiotis Issaris
        case MKTAG('I', 'P', 'R', 'D'):
499
            avi_read_tag(pb, s->album, sizeof(s->album), size);
500
            break;
501 2ad4648f Panagiotis Issaris
        case MKTAG('I', 'P', 'R', 'T'):
502
            avi_read_tag(pb, str_track, sizeof(str_track), size);
503
            sscanf(str_track, "%d", &s->track);
504
            break;
505 de6d9b64 Fabrice Bellard
        default:
506 755c18ae Michael Niedermayer
            if(size > 1000000){
507
                av_log(s, AV_LOG_ERROR, "well something went wrong during header parsing, "
508
                                        "ill ignore it and try to continue anyway\n");
509
                avi->movi_list = url_ftell(pb) - 4;
510
                avi->movi_end  = url_fsize(pb);
511
                goto end_of_header;
512
            }
513 de6d9b64 Fabrice Bellard
            /* skip tag */
514
            size += (size & 1);
515
            url_fskip(pb, size);
516
            break;
517
        }
518
    }
519
 end_of_header:
520
    /* check stream number */
521
    if (stream_index != s->nb_streams - 1) {
522
    fail:
523
        for(i=0;i<s->nb_streams;i++) {
524 01f4895c Michael Niedermayer
            av_freep(&s->streams[i]->codec->extradata);
525 9145f8b3 Michael Niedermayer
            av_freep(&s->streams[i]);
526 de6d9b64 Fabrice Bellard
        }
527
        return -1;
528
    }
529 1101abfe Zdenek Kabelac
530 b7b22558 Michael Niedermayer
    if(!avi->index_loaded && !url_is_streamed(pb))
531 94d1d6c0 Michael Niedermayer
        avi_load_index(s);
532 42feef6b Michael Niedermayer
    avi->index_loaded = 1;
533 30a43f2d Michael Niedermayer
    avi->non_interleaved |= guess_ni_flag(s);
534 115e8ae5 Michael Niedermayer
    if(avi->non_interleaved)
535
        clean_index(s);
536 115329f1 Diego Biurrun
537 de6d9b64 Fabrice Bellard
    return 0;
538
}
539
540 1101abfe Zdenek Kabelac
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
541 de6d9b64 Fabrice Bellard
{
542
    AVIContext *avi = s->priv_data;
543
    ByteIOContext *pb = &s->pb;
544 8f9298f8 Roman Shaposhnik
    int n, d[8], size;
545 4a8d5135 Michael Niedermayer
    offset_t i, sync;
546 7458ccbb Roman Shaposhnik
    void* dstr;
547 115329f1 Diego Biurrun
548 a2a6332b Aurelien Jacobs
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
549 7458ccbb Roman Shaposhnik
        size = dv_get_packet(avi->dv_demux, pkt);
550 bb270c08 Diego Biurrun
        if (size >= 0)
551
            return size;
552 2af7e610 Fabrice Bellard
    }
553 115329f1 Diego Biurrun
554 7c7f3866 Michael Niedermayer
    if(avi->non_interleaved){
555 79396ac6 Måns Rullgård
        int best_stream_index = 0;
556 7c7f3866 Michael Niedermayer
        AVStream *best_st= NULL;
557
        AVIStream *best_ast;
558
        int64_t best_ts= INT64_MAX;
559
        int i;
560 115329f1 Diego Biurrun
561 7c7f3866 Michael Niedermayer
        for(i=0; i<s->nb_streams; i++){
562
            AVStream *st = s->streams[i];
563
            AVIStream *ast = st->priv_data;
564
            int64_t ts= ast->frame_offset;
565
566
            if(ast->sample_size)
567
                ts /= ast->sample_size;
568
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
569
570 949b1a13 Steve L'Homme
//            av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
571 7c7f3866 Michael Niedermayer
            if(ts < best_ts){
572
                best_ts= ts;
573
                best_st= st;
574
                best_stream_index= i;
575
            }
576
        }
577
        best_ast = best_st->priv_data;
578
        best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
579
        if(best_ast->remaining)
580
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
581
        else
582
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
583
584
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
585
        if(i>=0){
586
            int64_t pos= best_st->index_entries[i].pos;
587 5c89153e Michael Niedermayer
            pos += best_ast->packet_size - best_ast->remaining;
588 1894edeb Michael Niedermayer
            url_fseek(&s->pb, pos + 8, SEEK_SET);
589 949b1a13 Steve L'Homme
//        av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
590 115329f1 Diego Biurrun
591 8223bca5 Michael Niedermayer
            assert(best_ast->remaining <= best_ast->packet_size);
592
593 1894edeb Michael Niedermayer
            avi->stream_index= best_stream_index;
594
            if(!best_ast->remaining)
595 8223bca5 Michael Niedermayer
                best_ast->packet_size=
596 1894edeb Michael Niedermayer
                best_ast->remaining= best_st->index_entries[i].size;
597 7c7f3866 Michael Niedermayer
        }
598
    }
599 115329f1 Diego Biurrun
600 4a8d5135 Michael Niedermayer
resync:
601 7c7f3866 Michael Niedermayer
    if(avi->stream_index >= 0){
602
        AVStream *st= s->streams[ avi->stream_index ];
603
        AVIStream *ast= st->priv_data;
604
        int size;
605 115329f1 Diego Biurrun
606 e84dab5f Michael Niedermayer
        if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
607 7c7f3866 Michael Niedermayer
            size= INT_MAX;
608 115329f1 Diego Biurrun
        else if(ast->sample_size < 32)
609 7c7f3866 Michael Niedermayer
            size= 64*ast->sample_size;
610
        else
611
            size= ast->sample_size;
612
613
        if(size > ast->remaining)
614
            size= ast->remaining;
615 2692067a Michael Niedermayer
        av_get_packet(pb, pkt, size);
616 115329f1 Diego Biurrun
617 a2a6332b Aurelien Jacobs
        if (ENABLE_DV_DEMUXER && avi->dv_demux) {
618 7c7f3866 Michael Niedermayer
            dstr = pkt->destruct;
619
            size = dv_produce_packet(avi->dv_demux, pkt,
620
                                    pkt->data, pkt->size);
621
            pkt->destruct = dstr;
622
            pkt->flags |= PKT_FLAG_KEY;
623
        } else {
624
            /* XXX: how to handle B frames in avi ? */
625
            pkt->dts = ast->frame_offset;
626
//                pkt->dts += ast->start;
627
            if(ast->sample_size)
628
                pkt->dts /= ast->sample_size;
629 949b1a13 Steve L'Homme
//av_log(NULL, 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);
630 7c7f3866 Michael Niedermayer
            pkt->stream_index = avi->stream_index;
631
632 01f4895c Michael Niedermayer
            if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
633 4323b09d Michael Niedermayer
                AVIndexEntry *e;
634
                int index;
635 ded3c7da Michael Niedermayer
                assert(st->index_entries);
636 7c7f3866 Michael Niedermayer
637 4323b09d Michael Niedermayer
                index= av_index_search_timestamp(st, pkt->dts, 0);
638
                e= &st->index_entries[index];
639 115329f1 Diego Biurrun
640 4323b09d Michael Niedermayer
                if(index >= 0 && e->timestamp == ast->frame_offset){
641
                    if (e->flags & AVINDEX_KEYFRAME)
642
                        pkt->flags |= PKT_FLAG_KEY;
643
                }
644 7c7f3866 Michael Niedermayer
            } else {
645 115329f1 Diego Biurrun
                pkt->flags |= PKT_FLAG_KEY;
646 7c7f3866 Michael Niedermayer
            }
647
            if(ast->sample_size)
648
                ast->frame_offset += pkt->size;
649
            else
650
                ast->frame_offset++;
651
        }
652
        ast->remaining -= size;
653
        if(!ast->remaining){
654
            avi->stream_index= -1;
655
            ast->packet_size= 0;
656
        }
657
658
        return size;
659
    }
660
661 4a8d5135 Michael Niedermayer
    memset(d, -1, sizeof(int)*8);
662
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
663 df99755b Michael Niedermayer
        int j;
664 1101abfe Zdenek Kabelac
665 bb270c08 Diego Biurrun
        if (i >= avi->movi_end) {
666
            if (avi->is_odml) {
667
                url_fskip(pb, avi->riff_end - i);
668
                avi->riff_end = avi->movi_end = url_fsize(pb);
669
            } else
670
                break;
671
        }
672 06219cb1 Roman Shaposhnik
673 df99755b Michael Niedermayer
        for(j=0; j<7; j++)
674
            d[j]= d[j+1];
675
        d[7]= get_byte(pb);
676 115329f1 Diego Biurrun
677 df99755b Michael Niedermayer
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
678 115329f1 Diego Biurrun
679 df99755b Michael Niedermayer
        if(    d[2] >= '0' && d[2] <= '9'
680 d2c5f0a4 Michael Niedermayer
            && d[3] >= '0' && d[3] <= '9'){
681
            n= (d[2] - '0') * 10 + (d[3] - '0');
682
        }else{
683
            n= 100; //invalid stream id
684 df99755b Michael Niedermayer
        }
685 949b1a13 Steve L'Homme
//av_log(NULL, 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);
686 d2c5f0a4 Michael Niedermayer
        if(i + size > avi->movi_end || d[0]<0)
687
            continue;
688 115329f1 Diego Biurrun
689 d2c5f0a4 Michael Niedermayer
        //parse ix##
690
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
691 bb270c08 Diego Biurrun
        //parse JUNK
692 d2c5f0a4 Michael Niedermayer
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
693 8f9298f8 Roman Shaposhnik
            url_fskip(pb, size);
694 d2c5f0a4 Michael Niedermayer
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
695 4a8d5135 Michael Niedermayer
            goto resync;
696 8f9298f8 Roman Shaposhnik
        }
697 d2c5f0a4 Michael Niedermayer
698 df99755b Michael Niedermayer
        if(    d[0] >= '0' && d[0] <= '9'
699 d2c5f0a4 Michael Niedermayer
            && d[1] >= '0' && d[1] <= '9'){
700
            n= (d[0] - '0') * 10 + (d[1] - '0');
701
        }else{
702
            n= 100; //invalid stream id
703
        }
704 115329f1 Diego Biurrun
705 d2c5f0a4 Michael Niedermayer
        //parse ##dc/##wb
706 80e3a08c Michael Niedermayer
        if(n < s->nb_streams){
707 d2c5f0a4 Michael Niedermayer
          AVStream *st;
708
          AVIStream *ast;
709
          st = s->streams[n];
710
          ast = st->priv_data;
711 115329f1 Diego Biurrun
712 f3356e9c Michael Niedermayer
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
713
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
714
             || st->discard >= AVDISCARD_ALL){
715
                if(ast->sample_size) ast->frame_offset += pkt->size;
716
                else                 ast->frame_offset++;
717 b4aea108 Michael Niedermayer
                url_fskip(pb, size);
718
                goto resync;
719
          }
720 d2c5f0a4 Michael Niedermayer
721 115329f1 Diego Biurrun
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
722 d2c5f0a4 Michael Niedermayer
                d[2]*256+d[3] == ast->prefix /*||
723 115329f1 Diego Biurrun
                (d[2] == 'd' && d[3] == 'c') ||
724 bb270c08 Diego Biurrun
                (d[2] == 'w' && d[3] == 'b')*/) {
725 d2c5f0a4 Michael Niedermayer
726
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
727
            if(d[2]*256+d[3] == ast->prefix)
728
                ast->prefix_count++;
729
            else{
730
                ast->prefix= d[2]*256+d[3];
731
                ast->prefix_count= 0;
732
            }
733
734 7c7f3866 Michael Niedermayer
            avi->stream_index= n;
735
            ast->packet_size= size + 8;
736
            ast->remaining= size;
737 ded3c7da Michael Niedermayer
738
            {
739
                uint64_t pos= url_ftell(pb) - 8;
740
                if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
741
                    av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME);
742
                }
743
            }
744 7c7f3866 Michael Niedermayer
            goto resync;
745 d2c5f0a4 Michael Niedermayer
          }
746 df99755b Michael Niedermayer
        }
747 69bde0b2 Mike Melanson
        /* palette changed chunk */
748
        if (   d[0] >= '0' && d[0] <= '9'
749
            && d[1] >= '0' && d[1] <= '9'
750
            && ((d[2] == 'p' && d[3] == 'c'))
751
            && n < s->nb_streams && i + size <= avi->movi_end) {
752
753
            AVStream *st;
754
            int first, clr, flags, k, p;
755
756
            st = s->streams[n];
757
758
            first = get_byte(pb);
759
            clr = get_byte(pb);
760 bb270c08 Diego Biurrun
            if(!clr) /* all 256 colors used */
761
                clr = 256;
762 69bde0b2 Mike Melanson
            flags = get_le16(pb);
763
            p = 4;
764
            for (k = first; k < clr + first; k++) {
765
                int r, g, b;
766
                r = get_byte(pb);
767
                g = get_byte(pb);
768
                b = get_byte(pb);
769
                    get_byte(pb);
770 01f4895c Michael Niedermayer
                st->codec->palctrl->palette[k] = b + (g << 8) + (r << 16);
771 69bde0b2 Mike Melanson
            }
772 01f4895c Michael Niedermayer
            st->codec->palctrl->palette_changed = 1;
773 4a8d5135 Michael Niedermayer
            goto resync;
774 69bde0b2 Mike Melanson
        }
775
776 df99755b Michael Niedermayer
    }
777 d2c5f0a4 Michael Niedermayer
778 df99755b Michael Niedermayer
    return -1;
779 de6d9b64 Fabrice Bellard
}
780
781 155e9ee9 Fabrice Bellard
/* XXX: we make the implicit supposition that the position are sorted
782
   for each stream */
783
static int avi_read_idx1(AVFormatContext *s, int size)
784
{
785 7c7f3866 Michael Niedermayer
    AVIContext *avi = s->priv_data;
786 155e9ee9 Fabrice Bellard
    ByteIOContext *pb = &s->pb;
787
    int nb_index_entries, i;
788
    AVStream *st;
789
    AVIStream *ast;
790
    unsigned int index, tag, flags, pos, len;
791 7c7f3866 Michael Niedermayer
    unsigned last_pos= -1;
792 115329f1 Diego Biurrun
793 155e9ee9 Fabrice Bellard
    nb_index_entries = size / 16;
794
    if (nb_index_entries <= 0)
795
        return -1;
796
797
    /* read the entries and sort them in each stream component */
798
    for(i = 0; i < nb_index_entries; i++) {
799
        tag = get_le32(pb);
800
        flags = get_le32(pb);
801
        pos = get_le32(pb);
802
        len = get_le32(pb);
803 52a0bbff Michael Niedermayer
#if defined(DEBUG_SEEK)
804 115329f1 Diego Biurrun
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
805 155e9ee9 Fabrice Bellard
               i, tag, flags, pos, len);
806
#endif
807 7c7f3866 Michael Niedermayer
        if(i==0 && pos > avi->movi_list)
808
            avi->movi_list= 0; //FIXME better check
809 5c89153e Michael Niedermayer
        pos += avi->movi_list;
810 7c7f3866 Michael Niedermayer
811 155e9ee9 Fabrice Bellard
        index = ((tag & 0xff) - '0') * 10;
812
        index += ((tag >> 8) & 0xff) - '0';
813
        if (index >= s->nb_streams)
814
            continue;
815
        st = s->streams[index];
816
        ast = st->priv_data;
817 115329f1 Diego Biurrun
818 52a0bbff Michael Niedermayer
#if defined(DEBUG_SEEK)
819 949b1a13 Steve L'Homme
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
820 52a0bbff Michael Niedermayer
#endif
821 80e3a08c Michael Niedermayer
        if(last_pos == pos)
822
            avi->non_interleaved= 1;
823
        else
824 2b70eb2b Michael Niedermayer
            av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
825 7c7f3866 Michael Niedermayer
        if(ast->sample_size)
826 2b70eb2b Michael Niedermayer
            ast->cum_len += len;
827 7c7f3866 Michael Niedermayer
        else
828
            ast->cum_len ++;
829
        last_pos= pos;
830 155e9ee9 Fabrice Bellard
    }
831
    return 0;
832
}
833
834 7c7f3866 Michael Niedermayer
static int guess_ni_flag(AVFormatContext *s){
835
    int i;
836
    int64_t last_start=0;
837
    int64_t first_end= INT64_MAX;
838 115329f1 Diego Biurrun
839 7c7f3866 Michael Niedermayer
    for(i=0; i<s->nb_streams; i++){
840
        AVStream *st = s->streams[i];
841
        int n= st->nb_index_entries;
842
843
        if(n <= 0)
844
            continue;
845
846
        if(st->index_entries[0].pos > last_start)
847
            last_start= st->index_entries[0].pos;
848
        if(st->index_entries[n-1].pos < first_end)
849
            first_end= st->index_entries[n-1].pos;
850
    }
851
    return last_start > first_end;
852
}
853
854 155e9ee9 Fabrice Bellard
static int avi_load_index(AVFormatContext *s)
855
{
856
    AVIContext *avi = s->priv_data;
857
    ByteIOContext *pb = &s->pb;
858
    uint32_t tag, size;
859 e6c0297f Michael Niedermayer
    offset_t pos= url_ftell(pb);
860 115329f1 Diego Biurrun
861 155e9ee9 Fabrice Bellard
    url_fseek(pb, avi->movi_end, SEEK_SET);
862
#ifdef DEBUG_SEEK
863 949b1a13 Steve L'Homme
    printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
864 155e9ee9 Fabrice Bellard
#endif
865
    for(;;) {
866
        if (url_feof(pb))
867
            break;
868
        tag = get_le32(pb);
869
        size = get_le32(pb);
870
#ifdef DEBUG_SEEK
871
        printf("tag=%c%c%c%c size=0x%x\n",
872
               tag & 0xff,
873
               (tag >> 8) & 0xff,
874
               (tag >> 16) & 0xff,
875
               (tag >> 24) & 0xff,
876
               size);
877
#endif
878
        switch(tag) {
879
        case MKTAG('i', 'd', 'x', '1'):
880
            if (avi_read_idx1(s, size) < 0)
881
                goto skip;
882
            else
883
                goto the_end;
884
            break;
885
        default:
886
        skip:
887
            size += (size & 1);
888
            url_fskip(pb, size);
889
            break;
890
        }
891
    }
892
 the_end:
893 e6c0297f Michael Niedermayer
    url_fseek(pb, pos, SEEK_SET);
894 155e9ee9 Fabrice Bellard
    return 0;
895
}
896
897 7b3c1382 Michael Niedermayer
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
898 155e9ee9 Fabrice Bellard
{
899
    AVIContext *avi = s->priv_data;
900
    AVStream *st;
901 52a0bbff Michael Niedermayer
    int i, index;
902 155e9ee9 Fabrice Bellard
    int64_t pos;
903
904
    if (!avi->index_loaded) {
905
        /* we only load the index on demand */
906
        avi_load_index(s);
907
        avi->index_loaded = 1;
908
    }
909 52a0bbff Michael Niedermayer
    assert(stream_index>= 0);
910 155e9ee9 Fabrice Bellard
911
    st = s->streams[stream_index];
912 52a0bbff Michael Niedermayer
    index= av_index_search_timestamp(st, timestamp, flags);
913
    if(index<0)
914 155e9ee9 Fabrice Bellard
        return -1;
915 115329f1 Diego Biurrun
916 155e9ee9 Fabrice Bellard
    /* find the position */
917 52a0bbff Michael Niedermayer
    pos = st->index_entries[index].pos;
918
    timestamp = st->index_entries[index].timestamp;
919
920 949b1a13 Steve L'Homme
//    av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
921 155e9ee9 Fabrice Bellard
922 6eb2de74 Roman Shaposhnik
    if (ENABLE_DV_DEMUXER && avi->dv_demux) {
923
        /* One and only one real stream for DV in AVI, and it has video  */
924
        /* offsets. Calling with other stream indices should have failed */
925
        /* the av_index_search_timestamp call above.                     */
926
        assert(stream_index == 0);
927
928
        /* Feed the DV video stream version of the timestamp to the */
929
        /* DV demux so it can synth correct timestamps              */
930
        dv_offset_reset(avi->dv_demux, timestamp);
931
932
        url_fseek(&s->pb, pos, SEEK_SET);
933
        avi->stream_index= -1;
934
        return 0;
935
    }
936
937 155e9ee9 Fabrice Bellard
    for(i = 0; i < s->nb_streams; i++) {
938 52a0bbff Michael Niedermayer
        AVStream *st2 = s->streams[i];
939
        AVIStream *ast2 = st2->priv_data;
940 7c7f3866 Michael Niedermayer
941
        ast2->packet_size=
942
        ast2->remaining= 0;
943
944 52a0bbff Michael Niedermayer
        if (st2->nb_index_entries <= 0)
945
            continue;
946 115329f1 Diego Biurrun
947 e84dab5f Michael Niedermayer
//        assert(st2->codec->block_align);
948 52a0bbff Michael Niedermayer
        assert(st2->time_base.den == ast2->rate);
949
        assert(st2->time_base.num == ast2->scale);
950
        index = av_index_search_timestamp(
951 115329f1 Diego Biurrun
                st2,
952 52a0bbff Michael Niedermayer
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
953
                flags | AVSEEK_FLAG_BACKWARD);
954
        if(index<0)
955
            index=0;
956 115329f1 Diego Biurrun
957 7c7f3866 Michael Niedermayer
        if(!avi->non_interleaved){
958
            while(index>0 && st2->index_entries[index].pos > pos)
959
                index--;
960
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
961
                index++;
962
        }
963
964 949b1a13 Steve L'Homme
//        av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
965 52a0bbff Michael Niedermayer
        /* extract the current frame number */
966
        ast2->frame_offset = st2->index_entries[index].timestamp;
967
        if(ast2->sample_size)
968
            ast2->frame_offset *=ast2->sample_size;
969 155e9ee9 Fabrice Bellard
    }
970 52a0bbff Michael Niedermayer
971 155e9ee9 Fabrice Bellard
    /* do the seek */
972
    url_fseek(&s->pb, pos, SEEK_SET);
973 7c7f3866 Michael Niedermayer
    avi->stream_index= -1;
974 155e9ee9 Fabrice Bellard
    return 0;
975
}
976
977 1101abfe Zdenek Kabelac
static int avi_read_close(AVFormatContext *s)
978 de6d9b64 Fabrice Bellard
{
979 5ae2c73e Michael Niedermayer
    int i;
980
    AVIContext *avi = s->priv_data;
981
982
    for(i=0;i<s->nb_streams;i++) {
983
        AVStream *st = s->streams[i];
984 155e9ee9 Fabrice Bellard
        AVIStream *ast = st->priv_data;
985 52a0bbff Michael Niedermayer
        av_free(ast);
986 01f4895c Michael Niedermayer
        av_free(st->codec->palctrl);
987 5ae2c73e Michael Niedermayer
    }
988
989 7458ccbb Roman Shaposhnik
    if (avi->dv_demux)
990
        av_free(avi->dv_demux);
991
992 c9a65ca8 Fabrice Bellard
    return 0;
993
}
994
995
static int avi_probe(AVProbeData *p)
996
{
997
    /* check file header */
998
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
999
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
1000
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
1001 d09ea618 Michael Niedermayer
        p->buf[10] == 'I' && (p->buf[11] == ' ' || p->buf[11] == 0x19))
1002 c9a65ca8 Fabrice Bellard
        return AVPROBE_SCORE_MAX;
1003
    else
1004
        return 0;
1005
}
1006
1007 ff70e601 Måns Rullgård
AVInputFormat avi_demuxer = {
1008 c9a65ca8 Fabrice Bellard
    "avi",
1009
    "avi format",
1010
    sizeof(AVIContext),
1011
    avi_probe,
1012
    avi_read_header,
1013
    avi_read_packet,
1014
    avi_read_close,
1015 155e9ee9 Fabrice Bellard
    avi_read_seek,
1016 c9a65ca8 Fabrice Bellard
};