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ffmpeg / libavformat / avidec.c @ 649b918c

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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 52a0bbff Michael Niedermayer
#undef NDEBUG
24
#include <assert.h>
25
26 de6d9b64 Fabrice Bellard
//#define DEBUG
27 155e9ee9 Fabrice Bellard
//#define DEBUG_SEEK
28
29
typedef struct AVIStream {
30 7c7f3866 Michael Niedermayer
    int64_t frame_offset; /* current frame (video) or byte (audio) counter
31 155e9ee9 Fabrice Bellard
                         (used to compute the pts) */
32 7c7f3866 Michael Niedermayer
    int remaining;
33
    int packet_size;
34
35 155e9ee9 Fabrice Bellard
    int scale;
36
    int rate;    
37
    int sample_size; /* audio only data */
38 1fa3d65d Michael Niedermayer
    int start;
39 155e9ee9 Fabrice Bellard
    
40
    int cum_len; /* temporary storage (used during seek) */
41 d2c5f0a4 Michael Niedermayer
    
42
    int prefix;                       ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
43
    int prefix_count;
44 155e9ee9 Fabrice Bellard
} AVIStream;
45 de6d9b64 Fabrice Bellard
46
typedef struct {
47 7458ccbb Roman Shaposhnik
    int64_t  riff_end;
48
    int64_t  movi_end;
49 de6d9b64 Fabrice Bellard
    offset_t movi_list;
50 155e9ee9 Fabrice Bellard
    int index_loaded;
51 8f9298f8 Roman Shaposhnik
    int is_odml;
52 7c7f3866 Michael Niedermayer
    int non_interleaved;
53
    int stream_index;
54 ddaae6a9 Roman Shaposhnik
    DVDemuxContext* dv_demux;
55 de6d9b64 Fabrice Bellard
} AVIContext;
56
57 42feef6b Michael Niedermayer
static int avi_load_index(AVFormatContext *s);
58
59 de6d9b64 Fabrice Bellard
#ifdef DEBUG
60 1101abfe Zdenek Kabelac
static void print_tag(const char *str, unsigned int tag, int size)
61 de6d9b64 Fabrice Bellard
{
62
    printf("%s: tag=%c%c%c%c size=0x%x\n",
63
           str, tag & 0xff,
64
           (tag >> 8) & 0xff,
65
           (tag >> 16) & 0xff,
66
           (tag >> 24) & 0xff,
67
           size);
68
}
69
#endif
70
71 06219cb1 Roman Shaposhnik
static int get_riff(AVIContext *avi, ByteIOContext *pb)
72
{
73
    uint32_t tag; 
74
    /* check RIFF header */
75
    tag = get_le32(pb);
76
77
    if (tag != MKTAG('R', 'I', 'F', 'F'))
78
        return -1;
79
    avi->riff_end = get_le32(pb);   /* RIFF chunk size */
80
    avi->riff_end += url_ftell(pb); /* RIFF chunk end */
81
    tag = get_le32(pb);
82
    if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
83
        return -1;
84
    
85
    return 0;
86
}
87
88 1101abfe Zdenek Kabelac
static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
89 de6d9b64 Fabrice Bellard
{
90 c9a65ca8 Fabrice Bellard
    AVIContext *avi = s->priv_data;
91 de6d9b64 Fabrice Bellard
    ByteIOContext *pb = &s->pb;
92 deb0a292 Roman Shaposhnik
    uint32_t tag, tag1, handler;
93 b53f1064 Michael Niedermayer
    int codec_type, stream_index, frame_period, bit_rate;
94 247eadca Fabrice Bellard
    unsigned int size, nb_frames;
95
    int i, n;
96 de6d9b64 Fabrice Bellard
    AVStream *st;
97 155e9ee9 Fabrice Bellard
    AVIStream *ast;
98 9e8cd0db Mike Melanson
    int xan_video = 0;  /* hack to support Xan A/V */
99 de6d9b64 Fabrice Bellard
100 7c7f3866 Michael Niedermayer
    avi->stream_index= -1;
101
    
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 b53f1064 Michael Niedermayer
            if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
168 7458ccbb Roman Shaposhnik
                /* 
169
                 * After some consideration -- I don't think we 
170
                 * have to support anything but DV in a type1 AVIs.
171
                 */
172 deb0a292 Roman Shaposhnik
                if (s->nb_streams != 1)
173
                    goto fail;
174 7458ccbb Roman Shaposhnik
                
175
                if (handler != MKTAG('d', 'v', 's', 'd') &&
176
                    handler != MKTAG('d', 'v', 'h', 'd') &&
177
                    handler != MKTAG('d', 'v', 's', 'l'))
178
                   goto fail;
179 ddaae6a9 Roman Shaposhnik
                
180 2c3cee34 Roman Shaposhnik
                ast = s->streams[0]->priv_data;
181 ddaae6a9 Roman Shaposhnik
                av_freep(&s->streams[0]->codec.extradata);
182
                av_freep(&s->streams[0]);
183
                s->nb_streams = 0;
184
                avi->dv_demux = dv_init_demux(s);
185 7458ccbb Roman Shaposhnik
                if (!avi->dv_demux)
186
                    goto fail;
187 2c3cee34 Roman Shaposhnik
                s->streams[0]->priv_data = ast;
188
                url_fskip(pb, 3 * 4);
189
                ast->scale = get_le32(pb);
190
                ast->rate = get_le32(pb);
191 ddaae6a9 Roman Shaposhnik
                stream_index = s->nb_streams - 1;
192 2c3cee34 Roman Shaposhnik
                url_fskip(pb, size - 7*4);
193 b53f1064 Michael Niedermayer
                break;
194
            }
195 b559b29b Michael Niedermayer
196 b53f1064 Michael Niedermayer
            if (stream_index >= s->nb_streams) {
197
                url_fskip(pb, size - 8);
198
                break;
199
            } 
200
            st = s->streams[stream_index];
201
            ast = st->priv_data;
202
            st->codec.stream_codec_tag= handler;
203 b559b29b Michael Niedermayer
204 b53f1064 Michael Niedermayer
            get_le32(pb); /* flags */
205
            get_le16(pb); /* priority */
206
            get_le16(pb); /* language */
207
            get_le32(pb); /* initial frame */
208
            ast->scale = get_le32(pb);
209
            ast->rate = get_le32(pb);
210
            if(ast->scale && ast->rate){
211
            }else if(frame_period){
212
                ast->rate = 1000000;
213
                ast->scale = frame_period;
214
            }else{
215
                ast->rate = 25;
216
                ast->scale = 1;
217
            }
218
            av_set_pts_info(st, 64, ast->scale, ast->rate);
219
                    
220
            ast->start= get_le32(pb); /* start */
221
            nb_frames = get_le32(pb);
222 b559b29b Michael Niedermayer
223 b53f1064 Michael Niedermayer
            st->start_time = 0;
224
            st->duration = av_rescale(nb_frames, ast->scale*(int64_t)AV_TIME_BASE, ast->rate);
225
            get_le32(pb); /* buffer size */
226
            get_le32(pb); /* quality */
227
            ast->sample_size = get_le32(pb); /* sample ssize */
228
//            av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
229 247eadca Fabrice Bellard
230 b53f1064 Michael Niedermayer
            switch(tag1) {
231
            case MKTAG('v', 'i', 'd', 's'):
232
                codec_type = CODEC_TYPE_VIDEO;
233 247eadca Fabrice Bellard
234 b53f1064 Michael Niedermayer
                ast->sample_size = 0;
235
                st->codec.frame_rate = ast->rate;
236
                st->codec.frame_rate_base = ast->scale;
237
                break;
238
            case MKTAG('a', 'u', 'd', 's'):
239
                codec_type = CODEC_TYPE_AUDIO;
240 9bf9a5fc Michael Niedermayer
                break;
241 cc11e2b3 Michael Niedermayer
            case MKTAG('t', 'x', 't', 's'):
242
                //FIXME 
243
                codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ?  FIXME
244
                break;
245 30667f42 Michael Niedermayer
            case MKTAG('p', 'a', 'd', 's'):
246
                codec_type = CODEC_TYPE_UNKNOWN;
247
                stream_index--;
248
                break;
249 9bf9a5fc Michael Niedermayer
            default:
250 30667f42 Michael Niedermayer
                av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
251 9bf9a5fc Michael Niedermayer
                goto fail;
252 de6d9b64 Fabrice Bellard
            }
253 b53f1064 Michael Niedermayer
            url_fskip(pb, size - 12 * 4);
254 de6d9b64 Fabrice Bellard
            break;
255
        case MKTAG('s', 't', 'r', 'f'):
256
            /* stream header */
257 7458ccbb Roman Shaposhnik
            if (stream_index >= s->nb_streams || avi->dv_demux) {
258 de6d9b64 Fabrice Bellard
                url_fskip(pb, size);
259
            } else {
260
                st = s->streams[stream_index];
261
                switch(codec_type) {
262
                case CODEC_TYPE_VIDEO:
263
                    get_le32(pb); /* size */
264
                    st->codec.width = get_le32(pb);
265
                    st->codec.height = get_le32(pb);
266
                    get_le16(pb); /* panes */
267 b559b29b Michael Niedermayer
                    st->codec.bits_per_sample= get_le16(pb); /* depth */
268 de6d9b64 Fabrice Bellard
                    tag1 = get_le32(pb);
269 b559b29b Michael Niedermayer
                    get_le32(pb); /* ImageSize */
270
                    get_le32(pb); /* XPelsPerMeter */
271
                    get_le32(pb); /* YPelsPerMeter */
272
                    get_le32(pb); /* ClrUsed */
273
                    get_le32(pb); /* ClrImportant */
274
275 568e18b1 Michael Niedermayer
                 if(size > 10*4 && size<(1<<30)){
276 b559b29b Michael Niedermayer
                    st->codec.extradata_size= size - 10*4;
277 3129cd01 Michael Niedermayer
                    st->codec.extradata= av_malloc(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
278 b559b29b Michael Niedermayer
                    get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
279 568e18b1 Michael Niedermayer
                 }
280 952c69c4 Michael Niedermayer
                    
281
                    if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
282
                        get_byte(pb);
283 b559b29b Michael Niedermayer
284 5e29abf8 Roberto Togni
                    /* Extract palette from extradata if bpp <= 8 */
285
                    /* This code assumes that extradata contains only palette */
286
                    /* This is true for all paletted codecs implemented in ffmpeg */
287
                    if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
288
                        st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
289
#ifdef WORDS_BIGENDIAN
290 19d053c5 Roman Shaposhnik
                        for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
291
                            st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
292 5e29abf8 Roberto Togni
#else
293
                        memcpy(st->codec.palctrl->palette, st->codec.extradata,
294
                               FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
295
#endif
296
                        st->codec.palctrl->palette_changed = 1;
297
                    }
298
299 de6d9b64 Fabrice Bellard
#ifdef DEBUG
300
                    print_tag("video", tag1, 0);
301
#endif
302
                    st->codec.codec_type = CODEC_TYPE_VIDEO;
303
                    st->codec.codec_tag = tag1;
304
                    st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
305 9e8cd0db Mike Melanson
                    if (st->codec.codec_id == CODEC_ID_XAN_WC4)
306
                        xan_video = 1;
307 b559b29b Michael Niedermayer
//                    url_fskip(pb, size - 5 * 4);
308 de6d9b64 Fabrice Bellard
                    break;
309 9bf9a5fc Michael Niedermayer
                case CODEC_TYPE_AUDIO:
310 2e7973bb Roman Shaposhnik
                    get_wav_header(pb, &st->codec, size);
311 1cef9527 Fran├žois Revol
                    if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
312
                        url_fskip(pb, 1);
313 9e8cd0db Mike Melanson
                    /* special case time: To support Xan DPCM, hardcode
314
                     * the format if Xxan is the video codec */
315 155e9ee9 Fabrice Bellard
                    st->need_parsing = 1;
316
                    /* force parsing as several audio frames can be in
317
                       one packet */
318 9e8cd0db Mike Melanson
                    if (xan_video)
319
                        st->codec.codec_id = CODEC_ID_XAN_DPCM;
320 de6d9b64 Fabrice Bellard
                    break;
321
                default:
322 75204092 Michael Niedermayer
                    st->codec.codec_type = CODEC_TYPE_DATA;
323
                    st->codec.codec_id= CODEC_ID_NONE;
324
                    st->codec.codec_tag= 0;
325 de6d9b64 Fabrice Bellard
                    url_fskip(pb, size);
326
                    break;
327
                }
328
            }
329
            break;
330
        default:
331
            /* skip tag */
332
            size += (size & 1);
333
            url_fskip(pb, size);
334
            break;
335
        }
336
    }
337
 end_of_header:
338
    /* check stream number */
339
    if (stream_index != s->nb_streams - 1) {
340
    fail:
341
        for(i=0;i<s->nb_streams;i++) {
342 8a7b1b18 Michael Niedermayer
            av_freep(&s->streams[i]->codec.extradata);
343 9145f8b3 Michael Niedermayer
            av_freep(&s->streams[i]);
344 de6d9b64 Fabrice Bellard
        }
345
        return -1;
346
    }
347 1101abfe Zdenek Kabelac
348 42feef6b Michael Niedermayer
    assert(!avi->index_loaded);
349
    avi_load_index(s);
350
    avi->index_loaded = 1;
351
 
352 de6d9b64 Fabrice Bellard
    return 0;
353
}
354
355 1101abfe Zdenek Kabelac
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
356 de6d9b64 Fabrice Bellard
{
357
    AVIContext *avi = s->priv_data;
358
    ByteIOContext *pb = &s->pb;
359 8f9298f8 Roman Shaposhnik
    int n, d[8], size;
360 4a8d5135 Michael Niedermayer
    offset_t i, sync;
361 7458ccbb Roman Shaposhnik
    void* dstr;
362
   
363
    if (avi->dv_demux) {
364
        size = dv_get_packet(avi->dv_demux, pkt);
365
        if (size >= 0)
366
            return size;
367 2af7e610 Fabrice Bellard
    }
368 7c7f3866 Michael Niedermayer
    
369
    if(avi->non_interleaved){
370
        int best_stream_index;
371
        AVStream *best_st= NULL;
372
        AVIStream *best_ast;
373
        int64_t best_ts= INT64_MAX;
374
        int i;
375
        
376
        for(i=0; i<s->nb_streams; i++){
377
            AVStream *st = s->streams[i];
378
            AVIStream *ast = st->priv_data;
379
            int64_t ts= ast->frame_offset;
380
381
            if(ast->sample_size)
382
                ts /= ast->sample_size;
383
            ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
384
385
//            av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
386
            if(ts < best_ts){
387
                best_ts= ts;
388
                best_st= st;
389
                best_stream_index= i;
390
            }
391
        }
392
        best_ast = best_st->priv_data;
393
        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
394
        if(best_ast->remaining)
395
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
396
        else
397
            i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
398
399
//        av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
400
        if(i>=0){
401
            int64_t pos= best_st->index_entries[i].pos;
402
            pos += avi->movi_list + best_ast->packet_size - best_ast->remaining;
403
            url_fseek(&s->pb, pos, SEEK_SET);
404
//        av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
405
            
406
            if(best_ast->remaining)
407
                avi->stream_index= best_stream_index;
408
            else
409
                avi->stream_index= -1;
410
        }
411
    }
412
    
413 4a8d5135 Michael Niedermayer
resync:
414 7c7f3866 Michael Niedermayer
    if(avi->stream_index >= 0){
415
        AVStream *st= s->streams[ avi->stream_index ];
416
        AVIStream *ast= st->priv_data;
417
        int size;
418
        
419
        if(ast->sample_size == 0)
420
            size= INT_MAX;
421
        else if(ast->sample_size < 32) 
422
            size= 64*ast->sample_size;
423
        else
424
            size= ast->sample_size;
425
426
        if(size > ast->remaining)
427
            size= ast->remaining;
428
        av_new_packet(pkt, size);
429
        get_buffer(pb, pkt->data, size);
430
        
431
        if (avi->dv_demux) {
432
            dstr = pkt->destruct;
433
            size = dv_produce_packet(avi->dv_demux, pkt,
434
                                    pkt->data, pkt->size);
435
            pkt->destruct = dstr;
436
            pkt->flags |= PKT_FLAG_KEY;
437
        } else {
438
            /* XXX: how to handle B frames in avi ? */
439
            pkt->dts = ast->frame_offset;
440
//                pkt->dts += ast->start;
441
            if(ast->sample_size)
442
                pkt->dts /= ast->sample_size;
443
//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);
444
            pkt->stream_index = avi->stream_index;
445
446
            if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
447
                if(st->index_entries){
448
                    AVIndexEntry *e;
449
                    int index;
450
451
                    index= av_index_search_timestamp(st, pkt->dts, 0);
452
                    e= &st->index_entries[index];
453
                    
454
                    if(e->timestamp == ast->frame_offset){
455
                        if (e->flags & AVINDEX_KEYFRAME)
456
                            pkt->flags |= PKT_FLAG_KEY;
457
                    }
458
                } else {
459
                    /* if no index, better to say that all frames
460
                        are key frames */
461
                    pkt->flags |= PKT_FLAG_KEY;
462
                }
463
            } else {
464
                pkt->flags |= PKT_FLAG_KEY; 
465
            }
466
            if(ast->sample_size)
467
                ast->frame_offset += pkt->size;
468
            else
469
                ast->frame_offset++;
470
        }
471
        ast->remaining -= size;
472
        if(!ast->remaining){
473
            avi->stream_index= -1;
474
            ast->packet_size= 0;
475
            if (size & 1) {
476
                get_byte(pb);
477
                size++;
478
            }
479
        }
480
481
        return size;
482
    }
483
484 4a8d5135 Michael Niedermayer
    memset(d, -1, sizeof(int)*8);
485
    for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
486 df99755b Michael Niedermayer
        int j;
487 1101abfe Zdenek Kabelac
488 8f9298f8 Roman Shaposhnik
        if (i >= avi->movi_end) {
489
            if (avi->is_odml) {
490
                url_fskip(pb, avi->riff_end - i);
491
                avi->riff_end = avi->movi_end = url_filesize(url_fileno(pb));
492
            } else
493
                break;
494 06219cb1 Roman Shaposhnik
        }
495
496 df99755b Michael Niedermayer
        for(j=0; j<7; j++)
497
            d[j]= d[j+1];
498
        d[7]= get_byte(pb);
499
        
500
        size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
501
        
502
        if(    d[2] >= '0' && d[2] <= '9'
503 d2c5f0a4 Michael Niedermayer
            && d[3] >= '0' && d[3] <= '9'){
504
            n= (d[2] - '0') * 10 + (d[3] - '0');
505
        }else{
506
            n= 100; //invalid stream id
507 df99755b Michael Niedermayer
        }
508 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);
509
        if(i + size > avi->movi_end || d[0]<0)
510
            continue;
511
        
512
        //parse ix##
513
        if(  (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
514 8f9298f8 Roman Shaposhnik
        //parse JUNK
515 d2c5f0a4 Michael Niedermayer
           ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
516 8f9298f8 Roman Shaposhnik
            url_fskip(pb, size);
517 d2c5f0a4 Michael Niedermayer
//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
518 4a8d5135 Michael Niedermayer
            goto resync;
519 8f9298f8 Roman Shaposhnik
        }
520 d2c5f0a4 Michael Niedermayer
521 df99755b Michael Niedermayer
        if(    d[0] >= '0' && d[0] <= '9'
522 d2c5f0a4 Michael Niedermayer
            && d[1] >= '0' && d[1] <= '9'){
523
            n= (d[0] - '0') * 10 + (d[1] - '0');
524
        }else{
525
            n= 100; //invalid stream id
526
        }
527 df99755b Michael Niedermayer
        
528 d2c5f0a4 Michael Niedermayer
        //parse ##dc/##wb
529 80e3a08c Michael Niedermayer
        if(n < s->nb_streams){
530 d2c5f0a4 Michael Niedermayer
          AVStream *st;
531
          AVIStream *ast;
532
          st = s->streams[n];
533
          ast = st->priv_data;
534 b4aea108 Michael Niedermayer
          
535 f3356e9c Michael Niedermayer
          if(   (st->discard >= AVDISCARD_DEFAULT && size==0)
536
             /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
537
             || st->discard >= AVDISCARD_ALL){
538
                if(ast->sample_size) ast->frame_offset += pkt->size;
539
                else                 ast->frame_offset++;
540 b4aea108 Michael Niedermayer
                url_fskip(pb, size);
541
                goto resync;
542
          }
543 d2c5f0a4 Michael Niedermayer
544 4a8d5135 Michael Niedermayer
          if(   ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) || 
545 d2c5f0a4 Michael Niedermayer
                d[2]*256+d[3] == ast->prefix /*||
546
                (d[2] == 'd' && d[3] == 'c') || 
547
                (d[2] == 'w' && d[3] == 'b')*/) {
548
549
//av_log(NULL, AV_LOG_DEBUG, "OK\n");
550
            if(d[2]*256+d[3] == ast->prefix)
551
                ast->prefix_count++;
552
            else{
553
                ast->prefix= d[2]*256+d[3];
554
                ast->prefix_count= 0;
555
            }
556
557 7c7f3866 Michael Niedermayer
            avi->stream_index= n;
558
            ast->packet_size= size + 8;
559
            ast->remaining= size;
560
            goto resync;
561 d2c5f0a4 Michael Niedermayer
          }
562 df99755b Michael Niedermayer
        }
563 69bde0b2 Mike Melanson
        /* palette changed chunk */
564
        if (   d[0] >= '0' && d[0] <= '9'
565
            && d[1] >= '0' && d[1] <= '9'
566
            && ((d[2] == 'p' && d[3] == 'c'))
567
            && n < s->nb_streams && i + size <= avi->movi_end) {
568
569
            AVStream *st;
570
            int first, clr, flags, k, p;
571
572
            st = s->streams[n];
573
574
            first = get_byte(pb);
575
            clr = get_byte(pb);
576 61c52ead Kostya Shishkov
            if(!clr) /* all 256 colors used */
577
                clr = 256;
578 69bde0b2 Mike Melanson
            flags = get_le16(pb);
579
            p = 4;
580
            for (k = first; k < clr + first; k++) {
581
                int r, g, b;
582
                r = get_byte(pb);
583
                g = get_byte(pb);
584
                b = get_byte(pb);
585
                    get_byte(pb);
586
                st->codec.palctrl->palette[k] = b + (g << 8) + (r << 16);
587
            }
588
            st->codec.palctrl->palette_changed = 1;
589 4a8d5135 Michael Niedermayer
            goto resync;
590 69bde0b2 Mike Melanson
        }
591
592 df99755b Michael Niedermayer
    }
593 d2c5f0a4 Michael Niedermayer
594 df99755b Michael Niedermayer
    return -1;
595 de6d9b64 Fabrice Bellard
}
596
597 155e9ee9 Fabrice Bellard
/* XXX: we make the implicit supposition that the position are sorted
598
   for each stream */
599
static int avi_read_idx1(AVFormatContext *s, int size)
600
{
601 7c7f3866 Michael Niedermayer
    AVIContext *avi = s->priv_data;
602 155e9ee9 Fabrice Bellard
    ByteIOContext *pb = &s->pb;
603
    int nb_index_entries, i;
604
    AVStream *st;
605
    AVIStream *ast;
606
    unsigned int index, tag, flags, pos, len;
607 7c7f3866 Michael Niedermayer
    unsigned last_pos= -1;
608 155e9ee9 Fabrice Bellard
    
609
    nb_index_entries = size / 16;
610
    if (nb_index_entries <= 0)
611
        return -1;
612
613
    /* read the entries and sort them in each stream component */
614
    for(i = 0; i < nb_index_entries; i++) {
615
        tag = get_le32(pb);
616
        flags = get_le32(pb);
617
        pos = get_le32(pb);
618
        len = get_le32(pb);
619 52a0bbff Michael Niedermayer
#if defined(DEBUG_SEEK)
620
        av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", 
621 155e9ee9 Fabrice Bellard
               i, tag, flags, pos, len);
622
#endif
623 7c7f3866 Michael Niedermayer
        if(i==0 && pos > avi->movi_list)
624
            avi->movi_list= 0; //FIXME better check
625
626 155e9ee9 Fabrice Bellard
        index = ((tag & 0xff) - '0') * 10;
627
        index += ((tag >> 8) & 0xff) - '0';
628
        if (index >= s->nb_streams)
629
            continue;
630
        st = s->streams[index];
631
        ast = st->priv_data;
632
        
633 52a0bbff Michael Niedermayer
#if defined(DEBUG_SEEK)
634
        av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
635
#endif
636 80e3a08c Michael Niedermayer
        if(last_pos == pos)
637
            avi->non_interleaved= 1;
638
        else
639 7c7f3866 Michael Niedermayer
            av_add_index_entry(st, pos, ast->cum_len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
640
        if(ast->sample_size)
641
            ast->cum_len += len / ast->sample_size;
642
        else
643
            ast->cum_len ++;
644
        last_pos= pos;
645 155e9ee9 Fabrice Bellard
    }
646
    return 0;
647
}
648
649 7c7f3866 Michael Niedermayer
static int guess_ni_flag(AVFormatContext *s){
650
    AVIContext *avi = s->priv_data;
651
    int i;
652
    int64_t last_start=0;
653
    int64_t first_end= INT64_MAX;
654
    
655
    for(i=0; i<s->nb_streams; i++){
656
        AVStream *st = s->streams[i];
657
        AVIStream *ast = st->priv_data;
658
        int n= st->nb_index_entries;
659
660
        if(n <= 0)
661
            continue;
662
663
        if(st->index_entries[0].pos > last_start)
664
            last_start= st->index_entries[0].pos;
665
        if(st->index_entries[n-1].pos < first_end)
666
            first_end= st->index_entries[n-1].pos;
667
    }
668
    return last_start > first_end;
669
}
670
671 155e9ee9 Fabrice Bellard
static int avi_load_index(AVFormatContext *s)
672
{
673
    AVIContext *avi = s->priv_data;
674
    ByteIOContext *pb = &s->pb;
675
    uint32_t tag, size;
676 e6c0297f Michael Niedermayer
    offset_t pos= url_ftell(pb);
677
    
678 155e9ee9 Fabrice Bellard
    url_fseek(pb, avi->movi_end, SEEK_SET);
679
#ifdef DEBUG_SEEK
680
    printf("movi_end=0x%llx\n", avi->movi_end);
681
#endif
682
    for(;;) {
683
        if (url_feof(pb))
684
            break;
685
        tag = get_le32(pb);
686
        size = get_le32(pb);
687
#ifdef DEBUG_SEEK
688
        printf("tag=%c%c%c%c size=0x%x\n",
689
               tag & 0xff,
690
               (tag >> 8) & 0xff,
691
               (tag >> 16) & 0xff,
692
               (tag >> 24) & 0xff,
693
               size);
694
#endif
695
        switch(tag) {
696
        case MKTAG('i', 'd', 'x', '1'):
697
            if (avi_read_idx1(s, size) < 0)
698
                goto skip;
699
            else
700
                goto the_end;
701
            break;
702
        default:
703
        skip:
704
            size += (size & 1);
705
            url_fskip(pb, size);
706
            break;
707
        }
708
    }
709
 the_end:
710 7c7f3866 Michael Niedermayer
    avi->non_interleaved |= guess_ni_flag(s);
711 e6c0297f Michael Niedermayer
    url_fseek(pb, pos, SEEK_SET);
712 155e9ee9 Fabrice Bellard
    return 0;
713
}
714
715 7b3c1382 Michael Niedermayer
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
716 155e9ee9 Fabrice Bellard
{
717
    AVIContext *avi = s->priv_data;
718
    AVStream *st;
719 52a0bbff Michael Niedermayer
    int i, index;
720 155e9ee9 Fabrice Bellard
    int64_t pos;
721
722
    if (!avi->index_loaded) {
723
        /* we only load the index on demand */
724
        avi_load_index(s);
725
        avi->index_loaded = 1;
726
    }
727 52a0bbff Michael Niedermayer
    assert(stream_index>= 0);
728 155e9ee9 Fabrice Bellard
729
    st = s->streams[stream_index];
730 52a0bbff Michael Niedermayer
    index= av_index_search_timestamp(st, timestamp, flags);
731
    if(index<0)
732 155e9ee9 Fabrice Bellard
        return -1;
733 52a0bbff Michael Niedermayer
    
734 155e9ee9 Fabrice Bellard
    /* find the position */
735 52a0bbff Michael Niedermayer
    pos = st->index_entries[index].pos;
736
    timestamp = st->index_entries[index].timestamp;
737
738
//    av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
739 155e9ee9 Fabrice Bellard
740
    for(i = 0; i < s->nb_streams; i++) {
741 52a0bbff Michael Niedermayer
        AVStream *st2 = s->streams[i];
742
        AVIStream *ast2 = st2->priv_data;
743 7c7f3866 Michael Niedermayer
744
        ast2->packet_size=
745
        ast2->remaining= 0;
746
747 52a0bbff Michael Niedermayer
        if (st2->nb_index_entries <= 0)
748
            continue;
749
        
750
//        assert(st2->codec.block_align);
751
        assert(st2->time_base.den == ast2->rate);
752
        assert(st2->time_base.num == ast2->scale);
753
        index = av_index_search_timestamp(
754
                st2, 
755
                av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
756
                flags | AVSEEK_FLAG_BACKWARD);
757
        if(index<0)
758
            index=0;
759 7c7f3866 Michael Niedermayer
        
760
        if(!avi->non_interleaved){
761
            while(index>0 && st2->index_entries[index].pos > pos)
762
                index--;
763
            while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
764
                index++;
765
        }
766
767 52a0bbff Michael Niedermayer
//        av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
768
        /* extract the current frame number */
769
        ast2->frame_offset = st2->index_entries[index].timestamp;
770
        if(ast2->sample_size)
771
            ast2->frame_offset *=ast2->sample_size;
772 155e9ee9 Fabrice Bellard
    }
773 52a0bbff Michael Niedermayer
774 664f5836 Roman Shaposhnik
    if (avi->dv_demux)
775
        dv_flush_audio_packets(avi->dv_demux);
776 155e9ee9 Fabrice Bellard
    /* do the seek */
777
    pos += avi->movi_list;
778
    url_fseek(&s->pb, pos, SEEK_SET);
779 7c7f3866 Michael Niedermayer
    avi->stream_index= -1;
780 155e9ee9 Fabrice Bellard
    return 0;
781
}
782
783 1101abfe Zdenek Kabelac
static int avi_read_close(AVFormatContext *s)
784 de6d9b64 Fabrice Bellard
{
785 5ae2c73e Michael Niedermayer
    int i;
786
    AVIContext *avi = s->priv_data;
787
788
    for(i=0;i<s->nb_streams;i++) {
789
        AVStream *st = s->streams[i];
790 155e9ee9 Fabrice Bellard
        AVIStream *ast = st->priv_data;
791 52a0bbff Michael Niedermayer
        av_free(ast);
792 5ae2c73e Michael Niedermayer
        av_free(st->codec.extradata);
793 5e29abf8 Roberto Togni
        av_free(st->codec.palctrl);
794 5ae2c73e Michael Niedermayer
    }
795
796 7458ccbb Roman Shaposhnik
    if (avi->dv_demux)
797
        av_free(avi->dv_demux);
798
799 c9a65ca8 Fabrice Bellard
    return 0;
800
}
801
802
static int avi_probe(AVProbeData *p)
803
{
804
    /* check file header */
805
    if (p->buf_size <= 32)
806
        return 0;
807
    if (p->buf[0] == 'R' && p->buf[1] == 'I' &&
808
        p->buf[2] == 'F' && p->buf[3] == 'F' &&
809
        p->buf[8] == 'A' && p->buf[9] == 'V' &&
810
        p->buf[10] == 'I' && p->buf[11] == ' ')
811
        return AVPROBE_SCORE_MAX;
812
    else
813
        return 0;
814
}
815
816
static AVInputFormat avi_iformat = {
817
    "avi",
818
    "avi format",
819
    sizeof(AVIContext),
820
    avi_probe,
821
    avi_read_header,
822
    avi_read_packet,
823
    avi_read_close,
824 155e9ee9 Fabrice Bellard
    avi_read_seek,
825 c9a65ca8 Fabrice Bellard
};
826
827
int avidec_init(void)
828
{
829
    av_register_input_format(&avi_iformat);
830 de6d9b64 Fabrice Bellard
    return 0;
831
}