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ffmpeg / libavformat / avidec.c @ 7be806f3

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1 de6d9b64 Fabrice Bellard
/*
2
 * AVI decoder.
3 19720f15 Fabrice Bellard
 * Copyright (c) 2001 Fabrice Bellard.
4 de6d9b64 Fabrice Bellard
 *
5 19720f15 Fabrice Bellard
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
8
 * version 2 of the License, or (at your option) any later version.
9 de6d9b64 Fabrice Bellard
 *
10 19720f15 Fabrice Bellard
 * This library is distributed in the hope that it will be useful,
11 de6d9b64 Fabrice Bellard
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 19720f15 Fabrice Bellard
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14 de6d9b64 Fabrice Bellard
 *
15 19720f15 Fabrice Bellard
 * You should have received a copy of the GNU Lesser General Public
16
 * License along with this library; if not, write to the Free Software
17
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
18 de6d9b64 Fabrice Bellard
 */
19
#include "avformat.h"
20
#include "avi.h"
21 7458ccbb Roman Shaposhnik
#include "dv.h"
22 de6d9b64 Fabrice Bellard
23
//#define DEBUG
24 155e9ee9 Fabrice Bellard
//#define DEBUG_SEEK
25
26
typedef struct AVIIndexEntry {
27
    unsigned int flags;
28
    unsigned int pos;
29
    unsigned int cum_len; /* sum of all lengths before this packet */
30
} AVIIndexEntry;
31
32
typedef struct AVIStream {
33
    AVIIndexEntry *index_entries;
34
    int nb_index_entries;
35
    int index_entries_allocated_size;
36
    int frame_offset; /* current frame (video) or byte (audio) counter
37
                         (used to compute the pts) */
38
    int scale;
39
    int rate;    
40
    int sample_size; /* audio only data */
41 1fa3d65d Michael Niedermayer
    int start;
42 155e9ee9 Fabrice Bellard
    
43
    int new_frame_offset; /* temporary storage (used during seek) */
44
    int cum_len; /* temporary storage (used during seek) */
45 d2c5f0a4 Michael Niedermayer
    
46
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
47
    int prefix_count;
48 155e9ee9 Fabrice Bellard
} AVIStream;
49 de6d9b64 Fabrice Bellard
50
typedef struct {
51 7458ccbb Roman Shaposhnik
    int64_t  riff_end;
52
    int64_t  movi_end;
53 de6d9b64 Fabrice Bellard
    offset_t movi_list;
54 155e9ee9 Fabrice Bellard
    int index_loaded;
55 8f9298f8 Roman Shaposhnik
    int is_odml;
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
61 de6d9b64 Fabrice Bellard
#ifdef DEBUG
62 1101abfe Zdenek Kabelac
static void print_tag(const char *str, unsigned int tag, int size)
63 de6d9b64 Fabrice Bellard
{
64
    printf("%s: tag=%c%c%c%c size=0x%x\n",
65
           str, tag & 0xff,
66
           (tag >> 8) & 0xff,
67
           (tag >> 16) & 0xff,
68
           (tag >> 24) & 0xff,
69
           size);
70
}
71
#endif
72
73 06219cb1 Roman Shaposhnik
static int get_riff(AVIContext *avi, ByteIOContext *pb)
74
{
75
    uint32_t tag; 
76
    /* check RIFF header */
77
    tag = get_le32(pb);
78
79
    if (tag != MKTAG('R', 'I', 'F', 'F'))
80
        return -1;
81
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
82
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
83
    tag = get_le32(pb);
84
    if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
85
        return -1;
86
    
87
    return 0;
88
}
89
90 1101abfe Zdenek Kabelac
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
91 de6d9b64 Fabrice Bellard
{
92 c9a65ca8 Fabrice Bellard
    AVIContext *avi = s->priv_data;
93 de6d9b64 Fabrice Bellard
    ByteIOContext *pb = &s->pb;
94 deb0a292 Roman Shaposhnik
    uint32_t tag, tag1, handler;
95 b559b29b Michael Niedermayer
    int codec_type, stream_index, frame_period, bit_rate, scale, rate;
96 247eadca Fabrice Bellard
    unsigned int size, nb_frames;
97
    int i, n;
98 de6d9b64 Fabrice Bellard
    AVStream *st;
99 155e9ee9 Fabrice Bellard
    AVIStream *ast;
100 9e8cd0db Mike Melanson
    int xan_video = 0;  /* hack to support Xan A/V */
101 de6d9b64 Fabrice Bellard
102 06219cb1 Roman Shaposhnik
    if (get_riff(avi, pb) < 0)
103 de6d9b64 Fabrice Bellard
        return -1;
104 1101abfe Zdenek Kabelac
105 de6d9b64 Fabrice Bellard
    /* first list tag */
106
    stream_index = -1;
107
    codec_type = -1;
108
    frame_period = 0;
109
    for(;;) {
110
        if (url_feof(pb))
111
            goto fail;
112
        tag = get_le32(pb);
113
        size = get_le32(pb);
114
#ifdef DEBUG
115
        print_tag("tag", tag, size);
116
#endif
117
118
        switch(tag) {
119
        case MKTAG('L', 'I', 'S', 'T'):
120
            /* ignored, except when start of video packets */
121
            tag1 = get_le32(pb);
122
#ifdef DEBUG
123
            print_tag("list", tag1, 0);
124
#endif
125
            if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
126 155e9ee9 Fabrice Bellard
                avi->movi_list = url_ftell(pb) - 4;
127 f8facaaf Michael Niedermayer
                if(size) avi->movi_end = avi->movi_list + size;
128
                else     avi->movi_end = url_filesize(url_fileno(pb));
129 de6d9b64 Fabrice Bellard
#ifdef DEBUG
130
                printf("movi end=%Lx\n", avi->movi_end);
131
#endif
132
                goto end_of_header;
133
            }
134
            break;
135 8f9298f8 Roman Shaposhnik
        case MKTAG('d', 'm', 'l', 'h'):
136
            avi->is_odml = 1;
137
            url_fskip(pb, size + (size & 1));
138
            break;
139 de6d9b64 Fabrice Bellard
        case MKTAG('a', 'v', 'i', 'h'):
140 1101abfe Zdenek Kabelac
            /* avi header */
141
            /* using frame_period is bad idea */
142 de6d9b64 Fabrice Bellard
            frame_period = get_le32(pb);
143
            bit_rate = get_le32(pb) * 8;
144 1101abfe Zdenek Kabelac
            url_fskip(pb, 4 * 4);
145 247eadca Fabrice Bellard
            n = get_le32(pb);
146
            for(i=0;i<n;i++) {
147 155e9ee9 Fabrice Bellard
                AVIStream *ast;
148 7458ccbb Roman Shaposhnik
                st = av_new_stream(s, i);
149 de6d9b64 Fabrice Bellard
                if (!st)
150
                    goto fail;
151 9ee91c2f Michael Niedermayer
152 155e9ee9 Fabrice Bellard
                ast = av_mallocz(sizeof(AVIStream));
153
                if (!ast)
154
                    goto fail;
155
                st->priv_data = ast;
156 1101abfe Zdenek Kabelac
            }
157 de6d9b64 Fabrice Bellard
            url_fskip(pb, size - 7 * 4);
158
            break;
159
        case MKTAG('s', 't', 'r', 'h'):
160
            /* stream header */
161
            stream_index++;
162
            tag1 = get_le32(pb);
163 7458ccbb Roman Shaposhnik
            handler = get_le32(pb); /* codec tag */
164 cc11e2b3 Michael Niedermayer
#ifdef DEBUG
165
        print_tag("strh", tag1, -1);
166
#endif
167 de6d9b64 Fabrice Bellard
            switch(tag1) {
168 deb0a292 Roman Shaposhnik
            case MKTAG('i', 'a', 'v', 's'):
169
            case MKTAG('i', 'v', 'a', 's'):
170 7458ccbb Roman Shaposhnik
                /* 
171
                 * After some consideration -- I don't think we 
172
                 * have to support anything but DV in a type1 AVIs.
173
                 */
174 deb0a292 Roman Shaposhnik
                if (s->nb_streams != 1)
175
                    goto fail;
176 7458ccbb Roman Shaposhnik
                
177
                if (handler != MKTAG('d', 'v', 's', 'd') &&
178
                    handler != MKTAG('d', 'v', 'h', 'd') &&
179
                    handler != MKTAG('d', 'v', 's', 'l'))
180
                   goto fail;
181 ddaae6a9 Roman Shaposhnik
                
182 2c3cee34 Roman Shaposhnik
                ast = s->streams[0]->priv_data;
183 ddaae6a9 Roman Shaposhnik
                av_freep(&s->streams[0]->codec.extradata);
184
                av_freep(&s->streams[0]);
185
                s->nb_streams = 0;
186
                avi->dv_demux = dv_init_demux(s);
187 7458ccbb Roman Shaposhnik
                if (!avi->dv_demux)
188
                    goto fail;
189 2c3cee34 Roman Shaposhnik
                s->streams[0]->priv_data = ast;
190
                url_fskip(pb, 3 * 4);
191
                ast->scale = get_le32(pb);
192
                ast->rate = get_le32(pb);
193 ddaae6a9 Roman Shaposhnik
                stream_index = s->nb_streams - 1;
194 2c3cee34 Roman Shaposhnik
                url_fskip(pb, size - 7*4);
195 ddaae6a9 Roman Shaposhnik
                break;
196 deb0a292 Roman Shaposhnik
            case MKTAG('v', 'i', 'd', 's'):
197 de6d9b64 Fabrice Bellard
                codec_type = CODEC_TYPE_VIDEO;
198 b559b29b Michael Niedermayer
199
                if (stream_index >= s->nb_streams) {
200 7458ccbb Roman Shaposhnik
                    url_fskip(pb, size - 8);
201 b559b29b Michael Niedermayer
                    break;
202
                } 
203
204
                st = s->streams[stream_index];
205 155e9ee9 Fabrice Bellard
                ast = st->priv_data;
206 76e9d392 Michael Niedermayer
                st->codec.stream_codec_tag= handler;
207 155e9ee9 Fabrice Bellard
                
208 de6d9b64 Fabrice Bellard
                get_le32(pb); /* flags */
209
                get_le16(pb); /* priority */
210
                get_le16(pb); /* language */
211
                get_le32(pb); /* XXX: initial frame ? */
212 deb0a292 Roman Shaposhnik
                scale = get_le32(pb); /* scale */
213
                rate = get_le32(pb); /* rate */
214 b559b29b Michael Niedermayer
215 14bea432 Michael Niedermayer
                if(scale && rate){
216
                }else if(frame_period){
217 155e9ee9 Fabrice Bellard
                    rate = 1000000;
218
                    scale = frame_period;
219 14bea432 Michael Niedermayer
                }else{
220 155e9ee9 Fabrice Bellard
                    rate = 25;
221
                    scale = 1;
222 14bea432 Michael Niedermayer
                }
223 155e9ee9 Fabrice Bellard
                ast->rate = rate;
224
                ast->scale = scale;
225 cdd5034f Michael Niedermayer
                av_set_pts_info(st, 64, scale, rate);
226 155e9ee9 Fabrice Bellard
                st->codec.frame_rate = rate;
227
                st->codec.frame_rate_base = scale;
228 247eadca Fabrice Bellard
                get_le32(pb); /* start */
229
                nb_frames = get_le32(pb);
230
                st->start_time = 0;
231 cde073b4 Michael Niedermayer
                st->duration = av_rescale(nb_frames,
232 8d65750e Michael Niedermayer
                    st->codec.frame_rate_base * (int64_t)AV_TIME_BASE,
233 cde073b4 Michael Niedermayer
                    st->codec.frame_rate);
234 247eadca Fabrice Bellard
                url_fskip(pb, size - 9 * 4);
235 de6d9b64 Fabrice Bellard
                break;
236
            case MKTAG('a', 'u', 'd', 's'):
237 247eadca Fabrice Bellard
                {
238 155e9ee9 Fabrice Bellard
                    unsigned int length;
239 247eadca Fabrice Bellard
240
                    codec_type = CODEC_TYPE_AUDIO;
241
242
                    if (stream_index >= s->nb_streams) {
243 7458ccbb Roman Shaposhnik
                        url_fskip(pb, size - 8);
244 247eadca Fabrice Bellard
                        break;
245
                    } 
246
                    st = s->streams[stream_index];
247 155e9ee9 Fabrice Bellard
                    ast = st->priv_data;
248
                    
249 247eadca Fabrice Bellard
                    get_le32(pb); /* flags */
250
                    get_le16(pb); /* priority */
251
                    get_le16(pb); /* language */
252
                    get_le32(pb); /* initial frame */
253 155e9ee9 Fabrice Bellard
                    ast->scale = get_le32(pb); /* scale */
254
                    ast->rate = get_le32(pb);
255 55c7e4ad Michael Niedermayer
                    if(!ast->rate)
256
                        ast->rate= 1; //wrong but better then 1/0
257 0fbc6961 Michael Niedermayer
                    if(!ast->scale)
258
                        ast->scale= 1; //wrong but better then 1/0
259 cdd5034f Michael Niedermayer
                    av_set_pts_info(st, 64, ast->scale, ast->rate);
260 1fa3d65d Michael Niedermayer
                    ast->start= get_le32(pb); /* start */
261 247eadca Fabrice Bellard
                    length = get_le32(pb); /* length, in samples or bytes */
262 155e9ee9 Fabrice Bellard
                    get_le32(pb); /* buffer size */
263
                    get_le32(pb); /* quality */
264
                    ast->sample_size = get_le32(pb); /* sample ssize */
265 1fa3d65d Michael Niedermayer
//av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->scale, ast->rate, ast->sample_size, ast->start);
266 247eadca Fabrice Bellard
                    st->start_time = 0;
267 cb43c0e1 Michael Niedermayer
                    st->duration = av_rescale(length, ast->scale*(int64_t)AV_TIME_BASE, ast->rate);
268 155e9ee9 Fabrice Bellard
                    url_fskip(pb, size - 12 * 4);
269 247eadca Fabrice Bellard
                }
270 9bf9a5fc Michael Niedermayer
                break;
271 cc11e2b3 Michael Niedermayer
            case MKTAG('t', 'x', 't', 's'):
272
                //FIXME 
273
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
274
                url_fskip(pb, size - 8);
275
                break;
276 30667f42 Michael Niedermayer
            case MKTAG('p', 'a', 'd', 's'):
277
                codec_type = CODEC_TYPE_UNKNOWN;
278
                url_fskip(pb, size - 8);
279
                stream_index--;
280
                break;
281 9bf9a5fc Michael Niedermayer
            default:
282 30667f42 Michael Niedermayer
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
283 9bf9a5fc Michael Niedermayer
                goto fail;
284 de6d9b64 Fabrice Bellard
            }
285
            break;
286
        case MKTAG('s', 't', 'r', 'f'):
287
            /* stream header */
288 7458ccbb Roman Shaposhnik
            if (stream_index >= s->nb_streams || avi->dv_demux) {
289 de6d9b64 Fabrice Bellard
                url_fskip(pb, size);
290
            } else {
291
                st = s->streams[stream_index];
292
                switch(codec_type) {
293
                case CODEC_TYPE_VIDEO:
294
                    get_le32(pb); /* size */
295
                    st->codec.width = get_le32(pb);
296
                    st->codec.height = get_le32(pb);
297
                    get_le16(pb); /* panes */
298 b559b29b Michael Niedermayer
                    st->codec.bits_per_sample= get_le16(pb); /* depth */
299 de6d9b64 Fabrice Bellard
                    tag1 = get_le32(pb);
300 b559b29b Michael Niedermayer
                    get_le32(pb); /* ImageSize */
301
                    get_le32(pb); /* XPelsPerMeter */
302
                    get_le32(pb); /* YPelsPerMeter */
303
                    get_le32(pb); /* ClrUsed */
304
                    get_le32(pb); /* ClrImportant */
305
306 568e18b1 Michael Niedermayer
                 if(size > 10*4 && size<(1<<30)){
307 b559b29b Michael Niedermayer
                    st->codec.extradata_size= size - 10*4;
308 3129cd01 Michael Niedermayer
                    st->codec.extradata= av_malloc(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
309 b559b29b Michael Niedermayer
                    get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
310 568e18b1 Michael Niedermayer
                 }
311 952c69c4 Michael Niedermayer
                    
312
                    if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
313
                        get_byte(pb);
314 b559b29b Michael Niedermayer
315 5e29abf8 Roberto Togni
                    /* Extract palette from extradata if bpp <= 8 */
316
                    /* This code assumes that extradata contains only palette */
317
                    /* This is true for all paletted codecs implemented in ffmpeg */
318
                    if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
319
                        st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
320
#ifdef WORDS_BIGENDIAN
321 19d053c5 Roman Shaposhnik
                        for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
322
                            st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
323 5e29abf8 Roberto Togni
#else
324
                        memcpy(st->codec.palctrl->palette, st->codec.extradata,
325
                               FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
326
#endif
327
                        st->codec.palctrl->palette_changed = 1;
328
                    }
329
330 de6d9b64 Fabrice Bellard
#ifdef DEBUG
331
                    print_tag("video", tag1, 0);
332
#endif
333
                    st->codec.codec_type = CODEC_TYPE_VIDEO;
334
                    st->codec.codec_tag = tag1;
335
                    st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
336 9e8cd0db Mike Melanson
                    if (st->codec.codec_id == CODEC_ID_XAN_WC4)
337
                        xan_video = 1;
338 b559b29b Michael Niedermayer
//                    url_fskip(pb, size - 5 * 4);
339 de6d9b64 Fabrice Bellard
                    break;
340 9bf9a5fc Michael Niedermayer
                case CODEC_TYPE_AUDIO:
341 2e7973bb Roman Shaposhnik
                    get_wav_header(pb, &st->codec, size);
342 1cef9527 Fran├žois Revol
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
343
                        url_fskip(pb, 1);
344 9e8cd0db Mike Melanson
                    /* special case time: To support Xan DPCM, hardcode
345
                     * the format if Xxan is the video codec */
346 155e9ee9 Fabrice Bellard
                    st->need_parsing = 1;
347
                    /* force parsing as several audio frames can be in
348
                       one packet */
349 9e8cd0db Mike Melanson
                    if (xan_video)
350
                        st->codec.codec_id = CODEC_ID_XAN_DPCM;
351 de6d9b64 Fabrice Bellard
                    break;
352
                default:
353 75204092 Michael Niedermayer
                    st->codec.codec_type = CODEC_TYPE_DATA;
354
                    st->codec.codec_id= CODEC_ID_NONE;
355
                    st->codec.codec_tag= 0;
356 de6d9b64 Fabrice Bellard
                    url_fskip(pb, size);
357
                    break;
358
                }
359
            }
360
            break;
361
        default:
362
            /* skip tag */
363
            size += (size & 1);
364
            url_fskip(pb, size);
365
            break;
366
        }
367
    }
368
 end_of_header:
369
    /* check stream number */
370
    if (stream_index != s->nb_streams - 1) {
371
    fail:
372
        for(i=0;i<s->nb_streams;i++) {
373 8a7b1b18 Michael Niedermayer
            av_freep(&s->streams[i]->codec.extradata);
374 9145f8b3 Michael Niedermayer
            av_freep(&s->streams[i]);
375 de6d9b64 Fabrice Bellard
        }
376
        return -1;
377
    }
378 1101abfe Zdenek Kabelac
379 42feef6b Michael Niedermayer
    assert(!avi->index_loaded);
380
    avi_load_index(s);
381
    avi->index_loaded = 1;
382
 
383 de6d9b64 Fabrice Bellard
    return 0;
384
}
385
386 1101abfe Zdenek Kabelac
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
387 de6d9b64 Fabrice Bellard
{
388
    AVIContext *avi = s->priv_data;
389
    ByteIOContext *pb = &s->pb;
390 8f9298f8 Roman Shaposhnik
    int n, d[8], size;
391 4a8d5135 Michael Niedermayer
    offset_t i, sync;
392 7458ccbb Roman Shaposhnik
    void* dstr;
393
   
394
    if (avi->dv_demux) {
395
        size = dv_get_packet(avi->dv_demux, pkt);
396
        if (size >= 0)
397
            return size;
398 2af7e610 Fabrice Bellard
    }
399 4a8d5135 Michael Niedermayer
400
resync:
401
    memset(d, -1, sizeof(int)*8);
402
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
403 df99755b Michael Niedermayer
        int j;
404 1101abfe Zdenek Kabelac
405 8f9298f8 Roman Shaposhnik
        if (i >= avi->movi_end) {
406
            if (avi->is_odml) {
407
                url_fskip(pb, avi->riff_end - i);
408
                avi->riff_end = avi->movi_end = url_filesize(url_fileno(pb));
409
            } else
410
                break;
411 06219cb1 Roman Shaposhnik
        }
412
413 df99755b Michael Niedermayer
        for(j=0; j<7; j++)
414
            d[j]= d[j+1];
415
        d[7]= get_byte(pb);
416
        
417
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
418
        
419
        if(    d[2] >= '0' && d[2] <= '9'
420 d2c5f0a4 Michael Niedermayer
            && d[3] >= '0' && d[3] <= '9'){
421
            n= (d[2] - '0') * 10 + (d[3] - '0');
422
        }else{
423
            n= 100; //invalid stream id
424 df99755b Michael Niedermayer
        }
425 d2c5f0a4 Michael Niedermayer
//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
426
        if(i + size > avi->movi_end || d[0]<0)
427
            continue;
428
        
429
        //parse ix##
430
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
431 8f9298f8 Roman Shaposhnik
        //parse JUNK
432 d2c5f0a4 Michael Niedermayer
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
433 8f9298f8 Roman Shaposhnik
            url_fskip(pb, size);
434 d2c5f0a4 Michael Niedermayer
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
435 4a8d5135 Michael Niedermayer
            goto resync;
436 8f9298f8 Roman Shaposhnik
        }
437 d2c5f0a4 Michael Niedermayer
438 df99755b Michael Niedermayer
        if(    d[0] >= '0' && d[0] <= '9'
439 d2c5f0a4 Michael Niedermayer
            && d[1] >= '0' && d[1] <= '9'){
440
            n= (d[0] - '0') * 10 + (d[1] - '0');
441
        }else{
442
            n= 100; //invalid stream id
443
        }
444 df99755b Michael Niedermayer
        
445 d2c5f0a4 Michael Niedermayer
        //parse ##dc/##wb
446
        if(n < s->nb_streams){
447
          AVStream *st;
448
          AVIStream *ast;
449
          st = s->streams[n];
450
          ast = st->priv_data;
451 b4aea108 Michael Niedermayer
          
452
          if(st->discard){
453
                url_fskip(pb, size);
454
                goto resync;
455
          }
456 d2c5f0a4 Michael Niedermayer
457 4a8d5135 Michael Niedermayer
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) || 
458 d2c5f0a4 Michael Niedermayer
                d[2]*256+d[3] == ast->prefix /*||
459
                (d[2] == 'd' && d[3] == 'c') || 
460
                (d[2] == 'w' && d[3] == 'b')*/) {
461
462
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
463
            if(d[2]*256+d[3] == ast->prefix)
464
                ast->prefix_count++;
465
            else{
466
                ast->prefix= d[2]*256+d[3];
467
                ast->prefix_count= 0;
468
            }
469
470 7458ccbb Roman Shaposhnik
            av_new_packet(pkt, size);
471 2af7e610 Fabrice Bellard
            get_buffer(pb, pkt->data, size);
472 7458ccbb Roman Shaposhnik
            if (size & 1) {
473 2af7e610 Fabrice Bellard
                get_byte(pb);
474 7458ccbb Roman Shaposhnik
                size++;
475
            }
476
        
477
            if (avi->dv_demux) {
478
                dstr = pkt->destruct;
479
                size = dv_produce_packet(avi->dv_demux, pkt,
480
                                         pkt->data, pkt->size);
481
                pkt->destruct = dstr;
482 155e9ee9 Fabrice Bellard
                pkt->flags |= PKT_FLAG_KEY;
483 7458ccbb Roman Shaposhnik
            } else {
484 155e9ee9 Fabrice Bellard
                /* XXX: how to handle B frames in avi ? */
485 42feef6b Michael Niedermayer
                pkt->dts = ast->frame_offset;
486
//                pkt->dts += ast->start;
487 1fa3d65d Michael Niedermayer
                if(ast->sample_size)
488 42feef6b Michael Niedermayer
                    pkt->dts /= ast->sample_size;
489 f8facaaf Michael Niedermayer
//av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%d %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, n, size);
490 7458ccbb Roman Shaposhnik
                pkt->stream_index = n;
491 155e9ee9 Fabrice Bellard
                /* FIXME: We really should read index for that */
492
                if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
493
                    if (ast->frame_offset < ast->nb_index_entries) {
494
                        if (ast->index_entries[ast->frame_offset].flags & AVIIF_INDEX)
495
                            pkt->flags |= PKT_FLAG_KEY; 
496
                    } else {
497
                        /* if no index, better to say that all frames
498
                           are key frames */
499
                        pkt->flags |= PKT_FLAG_KEY;
500
                    }
501
                } else {
502
                    pkt->flags |= PKT_FLAG_KEY; 
503
                }
504 1fa3d65d Michael Niedermayer
                if(ast->sample_size)
505
                    ast->frame_offset += pkt->size;
506
                else
507
                    ast->frame_offset++;
508 7458ccbb Roman Shaposhnik
            }
509
            return size;
510 d2c5f0a4 Michael Niedermayer
          }
511 df99755b Michael Niedermayer
        }
512 69bde0b2 Mike Melanson
        /* palette changed chunk */
513
        if (   d[0] >= '0' && d[0] <= '9'
514
            && d[1] >= '0' && d[1] <= '9'
515
            && ((d[2] == 'p' && d[3] == 'c'))
516
            && n < s->nb_streams && i + size <= avi->movi_end) {
517
518
            AVStream *st;
519
            int first, clr, flags, k, p;
520
521
            st = s->streams[n];
522
523
            first = get_byte(pb);
524
            clr = get_byte(pb);
525 61c52ead Kostya Shishkov
            if(!clr) /* all 256 colors used */
526
                clr = 256;
527 69bde0b2 Mike Melanson
            flags = get_le16(pb);
528
            p = 4;
529
            for (k = first; k < clr + first; k++) {
530
                int r, g, b;
531
                r = get_byte(pb);
532
                g = get_byte(pb);
533
                b = get_byte(pb);
534
                    get_byte(pb);
535
                st->codec.palctrl->palette[k] = b + (g << 8) + (r << 16);
536
            }
537
            st->codec.palctrl->palette_changed = 1;
538 4a8d5135 Michael Niedermayer
            goto resync;
539 69bde0b2 Mike Melanson
        }
540
541 df99755b Michael Niedermayer
    }
542 d2c5f0a4 Michael Niedermayer
543 df99755b Michael Niedermayer
    return -1;
544 de6d9b64 Fabrice Bellard
}
545
546 155e9ee9 Fabrice Bellard
/* XXX: we make the implicit supposition that the position are sorted
547
   for each stream */
548
static int avi_read_idx1(AVFormatContext *s, int size)
549
{
550
    ByteIOContext *pb = &s->pb;
551
    int nb_index_entries, i;
552
    AVStream *st;
553
    AVIStream *ast;
554
    AVIIndexEntry *ie, *entries;
555
    unsigned int index, tag, flags, pos, len;
556
    
557
    nb_index_entries = size / 16;
558
    if (nb_index_entries <= 0)
559
        return -1;
560 568e18b1 Michael Niedermayer
    if(nb_index_entries + 1 >= UINT_MAX / sizeof(AVIIndexEntry))
561
        return -1;
562 155e9ee9 Fabrice Bellard
563
    /* read the entries and sort them in each stream component */
564
    for(i = 0; i < nb_index_entries; i++) {
565
        tag = get_le32(pb);
566
        flags = get_le32(pb);
567
        pos = get_le32(pb);
568
        len = get_le32(pb);
569
#if defined(DEBUG_SEEK) && 0
570
        printf("%d: tag=0x%x flags=0x%x pos=0x%x len=%d\n", 
571
               i, tag, flags, pos, len);
572
#endif
573
        index = ((tag & 0xff) - '0') * 10;
574
        index += ((tag >> 8) & 0xff) - '0';
575
        if (index >= s->nb_streams)
576
            continue;
577
        st = s->streams[index];
578
        ast = st->priv_data;
579
        
580
        entries = av_fast_realloc(ast->index_entries,
581
                                  &ast->index_entries_allocated_size,
582
                                  (ast->nb_index_entries + 1) * 
583
                                  sizeof(AVIIndexEntry));
584
        if (entries) {
585
            ast->index_entries = entries;
586
            ie = &entries[ast->nb_index_entries++];
587
            ie->flags = flags;
588
            ie->pos = pos;
589
            ie->cum_len = ast->cum_len;
590
            ast->cum_len += len;
591
        }
592
    }
593
    return 0;
594
}
595
596
static int avi_load_index(AVFormatContext *s)
597
{
598
    AVIContext *avi = s->priv_data;
599
    ByteIOContext *pb = &s->pb;
600
    uint32_t tag, size;
601 e6c0297f Michael Niedermayer
    offset_t pos= url_ftell(pb);
602
    
603 155e9ee9 Fabrice Bellard
    url_fseek(pb, avi->movi_end, SEEK_SET);
604
#ifdef DEBUG_SEEK
605
    printf("movi_end=0x%llx\n", avi->movi_end);
606
#endif
607
    for(;;) {
608
        if (url_feof(pb))
609
            break;
610
        tag = get_le32(pb);
611
        size = get_le32(pb);
612
#ifdef DEBUG_SEEK
613
        printf("tag=%c%c%c%c size=0x%x\n",
614
               tag & 0xff,
615
               (tag >> 8) & 0xff,
616
               (tag >> 16) & 0xff,
617
               (tag >> 24) & 0xff,
618
               size);
619
#endif
620
        switch(tag) {
621
        case MKTAG('i', 'd', 'x', '1'):
622
            if (avi_read_idx1(s, size) < 0)
623
                goto skip;
624
            else
625
                goto the_end;
626
            break;
627
        default:
628
        skip:
629
            size += (size & 1);
630
            url_fskip(pb, size);
631
            break;
632
        }
633
    }
634
 the_end:
635 e6c0297f Michael Niedermayer
    url_fseek(pb, pos, SEEK_SET);
636 155e9ee9 Fabrice Bellard
    return 0;
637
}
638
639
/* return the index entry whose position is immediately >= 'wanted_pos' */
640
static int locate_frame_in_index(AVIIndexEntry *entries, 
641
                                 int nb_entries, int wanted_pos)
642
{
643
    int a, b, m, pos;
644
    
645
    a = 0;
646
    b = nb_entries - 1;
647
    while (a <= b) {
648
        m = (a + b) >> 1;
649
        pos = entries[m].pos;
650
        if (pos == wanted_pos)
651
            goto found;
652
        else if (pos > wanted_pos) {
653
            b = m - 1;
654
        } else {
655
            a = m + 1;
656
        }
657
    }
658
    m = a;
659
    if (m > 0)
660
        m--;
661
 found:
662
    return m;
663
}
664
665 7b3c1382 Michael Niedermayer
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
666 155e9ee9 Fabrice Bellard
{
667
    AVIContext *avi = s->priv_data;
668
    AVStream *st;
669
    AVIStream *ast;
670
    int frame_number, i;
671
    int64_t pos;
672
673
    if (!avi->index_loaded) {
674
        /* we only load the index on demand */
675
        avi_load_index(s);
676
        avi->index_loaded = 1;
677
    }
678
    if (stream_index < 0) {
679
        for(i = 0; i < s->nb_streams; i++) {
680
            st = s->streams[i];
681
            if (st->codec.codec_type == CODEC_TYPE_VIDEO)
682
                goto found;
683
        }
684
        return -1;
685
    found:
686
        stream_index = i;
687
    }
688
689
    st = s->streams[stream_index];
690
    if (st->codec.codec_type != CODEC_TYPE_VIDEO)
691
        return -1;
692
    ast = st->priv_data;
693
    /* compute the frame number */
694 4fc2c644 Michael Niedermayer
    frame_number = timestamp;
695 155e9ee9 Fabrice Bellard
#ifdef DEBUG_SEEK
696
    printf("timestamp=%0.3f nb_indexes=%d frame_number=%d\n", 
697
           (double)timestamp / AV_TIME_BASE,
698
           ast->nb_index_entries, frame_number);
699
#endif
700
    /* find a closest key frame before */
701
    if (frame_number >= ast->nb_index_entries)
702
        return -1;
703
    while (frame_number >= 0 &&
704
           !(ast->index_entries[frame_number].flags & AVIIF_INDEX))
705
        frame_number--;
706
    if (frame_number < 0)
707
        return -1;
708
    ast->new_frame_offset = frame_number;
709
710
    /* find the position */
711
    pos = ast->index_entries[frame_number].pos;
712
713
#ifdef DEBUG_SEEK
714
    printf("key_frame_number=%d pos=0x%llx\n", 
715
           frame_number, pos);
716
#endif
717
    
718
    /* update the frame counters for all the other stream by looking
719
       at the positions just after the one found */
720
    for(i = 0; i < s->nb_streams; i++) {
721
        int j;
722
        if (i != stream_index) {
723
            st = s->streams[i];
724
            ast = st->priv_data;
725
            if (ast->nb_index_entries <= 0)
726
                return -1;
727
            j = locate_frame_in_index(ast->index_entries,
728
                                      ast->nb_index_entries,
729
                                      pos);
730
            /* get next frame */
731
            if ((j  + 1) < ast->nb_index_entries)
732
                j++;
733
            /* extract the current frame number */
734 1fa3d65d Michael Niedermayer
            if (ast->sample_size==0)
735 155e9ee9 Fabrice Bellard
                ast->new_frame_offset = j;
736
            else
737
                ast->new_frame_offset = ast->index_entries[j].cum_len;
738
        }
739
    }
740
    
741
    /* everything is OK now. We can update the frame offsets */
742
    for(i = 0; i < s->nb_streams; i++) {
743
        st = s->streams[i];
744
        ast = st->priv_data;
745
        ast->frame_offset = ast->new_frame_offset;
746
#ifdef DEBUG_SEEK
747
        printf("%d: frame_offset=%d\n", i, 
748
               ast->frame_offset);
749
#endif
750
    }
751 664f5836 Roman Shaposhnik
    if (avi->dv_demux)
752
        dv_flush_audio_packets(avi->dv_demux);
753 155e9ee9 Fabrice Bellard
    /* do the seek */
754
    pos += avi->movi_list;
755
    url_fseek(&s->pb, pos, SEEK_SET);
756
    return 0;
757
}
758
759 1101abfe Zdenek Kabelac
static int avi_read_close(AVFormatContext *s)
760 de6d9b64 Fabrice Bellard
{
761 5ae2c73e Michael Niedermayer
    int i;
762
    AVIContext *avi = s->priv_data;
763
764
    for(i=0;i<s->nb_streams;i++) {
765
        AVStream *st = s->streams[i];
766 155e9ee9 Fabrice Bellard
        AVIStream *ast = st->priv_data;
767 3144b152 Michael Niedermayer
        if(ast){
768
            av_free(ast->index_entries);
769
            av_free(ast);
770
        }
771 5ae2c73e Michael Niedermayer
        av_free(st->codec.extradata);
772 5e29abf8 Roberto Togni
        av_free(st->codec.palctrl);
773 5ae2c73e Michael Niedermayer
    }
774
775 7458ccbb Roman Shaposhnik
    if (avi->dv_demux)
776
        av_free(avi->dv_demux);
777
778 c9a65ca8 Fabrice Bellard
    return 0;
779
}
780
781
static int avi_probe(AVProbeData *p)
782
{
783
    /* check file header */
784
    if (p->buf_size <= 32)
785
        return 0;
786
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
787
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
788
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
789
        p->buf[10] == 'I' && p->buf[11] == ' ')
790
        return AVPROBE_SCORE_MAX;
791
    else
792
        return 0;
793
}
794
795
static AVInputFormat avi_iformat = {
796
    "avi",
797
    "avi format",
798
    sizeof(AVIContext),
799
    avi_probe,
800
    avi_read_header,
801
    avi_read_packet,
802
    avi_read_close,
803 155e9ee9 Fabrice Bellard
    avi_read_seek,
804 c9a65ca8 Fabrice Bellard
};
805
806
int avidec_init(void)
807
{
808
    av_register_input_format(&avi_iformat);
809 de6d9b64 Fabrice Bellard
    return 0;
810
}