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ffmpeg / libavformat / asfdec.c @ 7c725380

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1
/*
2
 * ASF compatible demuxer
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
//#define DEBUG
23

    
24
#include "libavutil/common.h"
25
#include "libavutil/avstring.h"
26
#include "libavcodec/mpegaudio.h"
27
#include "avformat.h"
28
#include "riff.h"
29
#include "asf.h"
30
#include "asfcrypt.h"
31
#include "avlanguage.h"
32

    
33
void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
34

    
35
typedef struct {
36
    int asfid2avid[128];                 ///< conversion table from asf ID 2 AVStream ID
37
    ASFStream streams[128];              ///< it's max number and it's not that big
38
    uint32_t stream_bitrates[128];       ///< max number of streams, bitrate for each (for streaming)
39
    AVRational dar[128];
40
    char stream_languages[128][6];       ///< max number of streams, language for each (RFC1766, e.g. en-US)
41
    /* non streamed additonnal info */
42
    /* packet filling */
43
    int packet_size_left;
44
    /* only for reading */
45
    uint64_t data_offset;                ///< beginning of the first data packet
46
    uint64_t data_object_offset;         ///< data object offset (excl. GUID & size)
47
    uint64_t data_object_size;           ///< size of the data object
48
    int index_read;
49

    
50
    ASFMainHeader hdr;
51

    
52
    int packet_flags;
53
    int packet_property;
54
    int packet_timestamp;
55
    int packet_segsizetype;
56
    int packet_segments;
57
    int packet_seq;
58
    int packet_replic_size;
59
    int packet_key_frame;
60
    int packet_padsize;
61
    unsigned int packet_frag_offset;
62
    unsigned int packet_frag_size;
63
    int64_t packet_frag_timestamp;
64
    int packet_multi_size;
65
    int packet_obj_size;
66
    int packet_time_delta;
67
    int packet_time_start;
68
    int64_t packet_pos;
69

    
70
    int stream_index;
71

    
72
    ASFStream* asf_st;                   ///< currently decoded stream
73
} ASFContext;
74

    
75
#undef NDEBUG
76
#include <assert.h>
77

    
78
#define ASF_MAX_STREAMS 127
79
#define FRAME_HEADER_SIZE 17
80
// Fix Me! FRAME_HEADER_SIZE may be different.
81

    
82
static const ff_asf_guid index_guid = {
83
    0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
84
};
85

    
86
static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
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    0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
88
};
89
/**********************************/
90
/* decoding */
91

    
92
#ifdef DEBUG
93
#define PRINT_IF_GUID(g,cmp) \
94
if (!ff_guidcmp(g, &cmp)) \
95
    av_dlog(NULL, "(GUID: %s) ", #cmp)
96

    
97
static void print_guid(const ff_asf_guid *g)
98
{
99
    int i;
100
    PRINT_IF_GUID(g, ff_asf_header);
101
    else PRINT_IF_GUID(g, ff_asf_file_header);
102
    else PRINT_IF_GUID(g, ff_asf_stream_header);
103
    else PRINT_IF_GUID(g, ff_asf_audio_stream);
104
    else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
105
    else PRINT_IF_GUID(g, ff_asf_video_stream);
106
    else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
107
    else PRINT_IF_GUID(g, ff_asf_command_stream);
108
    else PRINT_IF_GUID(g, ff_asf_comment_header);
109
    else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
110
    else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
111
    else PRINT_IF_GUID(g, ff_asf_data_header);
112
    else PRINT_IF_GUID(g, index_guid);
113
    else PRINT_IF_GUID(g, ff_asf_head1_guid);
114
    else PRINT_IF_GUID(g, ff_asf_head2_guid);
115
    else PRINT_IF_GUID(g, ff_asf_my_guid);
116
    else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
117
    else PRINT_IF_GUID(g, ff_asf_extended_content_header);
118
    else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
119
    else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
120
    else PRINT_IF_GUID(g, ff_asf_metadata_header);
121
    else PRINT_IF_GUID(g, ff_asf_marker_header);
122
    else PRINT_IF_GUID(g, stream_bitrate_guid);
123
    else PRINT_IF_GUID(g, ff_asf_language_guid);
124
    else
125
        av_dlog(NULL, "(GUID: unknown) ");
126
    for(i=0;i<16;i++)
127
        av_dlog(NULL, " 0x%02x,", (*g)[i]);
128
    av_dlog(NULL, "}\n");
129
}
130
#undef PRINT_IF_GUID
131
#else
132
#define print_guid(g)
133
#endif
134

    
135
void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
136
{
137
    assert(sizeof(*g) == 16);
138
    get_buffer(s, *g, sizeof(*g));
139
}
140

    
141
static int asf_probe(AVProbeData *pd)
142
{
143
    /* check file header */
144
    if (!ff_guidcmp(pd->buf, &ff_asf_header))
145
        return AVPROBE_SCORE_MAX;
146
    else
147
        return 0;
148
}
149

    
150
static int get_value(ByteIOContext *pb, int type){
151
    switch(type){
152
        case 2: return get_le32(pb);
153
        case 3: return get_le32(pb);
154
        case 4: return get_le64(pb);
155
        case 5: return get_le16(pb);
156
        default:return INT_MIN;
157
    }
158
}
159

    
160
static void get_tag(AVFormatContext *s, const char *key, int type, int len)
161
{
162
    char *value;
163
    int64_t off = url_ftell(s->pb);
164

    
165
    if ((unsigned)len >= (UINT_MAX - 1)/2)
166
        return;
167

    
168
    value = av_malloc(2*len+1);
169
    if (!value)
170
        goto finish;
171

    
172
    if (type == 0) {         // UTF16-LE
173
        avio_get_str16le(s->pb, len, value, 2*len + 1);
174
    } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
175
        uint64_t num = get_value(s->pb, type);
176
        snprintf(value, len, "%"PRIu64, num);
177
    } else {
178
        av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
179
        goto finish;
180
    }
181
    av_metadata_set2(&s->metadata, key, value, 0);
182
finish:
183
    av_freep(&value);
184
    url_fseek(s->pb, off + len, SEEK_SET);
185
}
186

    
187
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
188
{
189
    ASFContext *asf = s->priv_data;
190
    ff_asf_guid g;
191
    ByteIOContext *pb = s->pb;
192
    AVStream *st;
193
    ASFStream *asf_st;
194
    int size, i;
195
    int64_t gsize;
196

    
197
    ff_get_guid(pb, &g);
198
    if (ff_guidcmp(&g, &ff_asf_header))
199
        return -1;
200
    get_le64(pb);
201
    get_le32(pb);
202
    get_byte(pb);
203
    get_byte(pb);
204
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
205
    for(;;) {
206
        uint64_t gpos= url_ftell(pb);
207
        int ret;
208
        ff_get_guid(pb, &g);
209
        gsize = get_le64(pb);
210
        av_dlog(s, "%08"PRIx64": ", gpos);
211
        print_guid(&g);
212
        av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
213
        if (!ff_guidcmp(&g, &ff_asf_data_header)) {
214
            asf->data_object_offset = url_ftell(pb);
215
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
216
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
217
                asf->data_object_size = gsize - 24;
218
            } else {
219
                asf->data_object_size = (uint64_t)-1;
220
            }
221
            break;
222
        }
223
        if (gsize < 24)
224
            return -1;
225
        if (!ff_guidcmp(&g, &ff_asf_file_header)) {
226
            ff_get_guid(pb, &asf->hdr.guid);
227
            asf->hdr.file_size          = get_le64(pb);
228
            asf->hdr.create_time        = get_le64(pb);
229
            get_le64(pb);                               /* number of packets */
230
            asf->hdr.play_time          = get_le64(pb);
231
            asf->hdr.send_time          = get_le64(pb);
232
            asf->hdr.preroll            = get_le32(pb);
233
            asf->hdr.ignore             = get_le32(pb);
234
            asf->hdr.flags              = get_le32(pb);
235
            asf->hdr.min_pktsize        = get_le32(pb);
236
            asf->hdr.max_pktsize        = get_le32(pb);
237
            asf->hdr.max_bitrate        = get_le32(pb);
238
            s->packet_size = asf->hdr.max_pktsize;
239
        } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
240
            enum AVMediaType type;
241
            int type_specific_size, sizeX;
242
            uint64_t total_size;
243
            unsigned int tag1;
244
            int64_t pos1, pos2, start_time;
245
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
246

    
247
            if (s->nb_streams == ASF_MAX_STREAMS) {
248
                av_log(s, AV_LOG_ERROR, "too many streams\n");
249
                return AVERROR(EINVAL);
250
            }
251

    
252
            pos1 = url_ftell(pb);
253

    
254
            st = av_new_stream(s, 0);
255
            if (!st)
256
                return AVERROR(ENOMEM);
257
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
258
            asf_st = av_mallocz(sizeof(ASFStream));
259
            if (!asf_st)
260
                return AVERROR(ENOMEM);
261
            st->priv_data = asf_st;
262
            start_time = asf->hdr.preroll;
263

    
264
            asf_st->stream_language_index = 128; // invalid stream index means no language info
265

    
266
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
267
                st->duration = asf->hdr.play_time /
268
                    (10000000 / 1000) - start_time;
269
            }
270
            ff_get_guid(pb, &g);
271

    
272
            test_for_ext_stream_audio = 0;
273
            if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
274
                type = AVMEDIA_TYPE_AUDIO;
275
            } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
276
                type = AVMEDIA_TYPE_VIDEO;
277
            } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
278
                type = AVMEDIA_TYPE_VIDEO;
279
                st->codec->codec_id = CODEC_ID_MJPEG;
280
            } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
281
                type = AVMEDIA_TYPE_DATA;
282
            } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
283
                test_for_ext_stream_audio = 1;
284
                type = AVMEDIA_TYPE_UNKNOWN;
285
            } else {
286
                return -1;
287
            }
288
            ff_get_guid(pb, &g);
289
            total_size = get_le64(pb);
290
            type_specific_size = get_le32(pb);
291
            get_le32(pb);
292
            st->id = get_le16(pb) & 0x7f; /* stream id */
293
            // mapping of asf ID to AV stream ID;
294
            asf->asfid2avid[st->id] = s->nb_streams - 1;
295

    
296
            get_le32(pb);
297

    
298
            if (test_for_ext_stream_audio) {
299
                ff_get_guid(pb, &g);
300
                if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
301
                    type = AVMEDIA_TYPE_AUDIO;
302
                    is_dvr_ms_audio=1;
303
                    ff_get_guid(pb, &g);
304
                    get_le32(pb);
305
                    get_le32(pb);
306
                    get_le32(pb);
307
                    ff_get_guid(pb, &g);
308
                    get_le32(pb);
309
                }
310
            }
311

    
312
            st->codec->codec_type = type;
313
            if (type == AVMEDIA_TYPE_AUDIO) {
314
                ff_get_wav_header(pb, st->codec, type_specific_size);
315
                if (is_dvr_ms_audio) {
316
                    // codec_id and codec_tag are unreliable in dvr_ms
317
                    // files. Set them later by probing stream.
318
                    st->codec->codec_id = CODEC_ID_PROBE;
319
                    st->codec->codec_tag = 0;
320
                }
321
                if (st->codec->codec_id == CODEC_ID_AAC) {
322
                    st->need_parsing = AVSTREAM_PARSE_NONE;
323
                } else {
324
                    st->need_parsing = AVSTREAM_PARSE_FULL;
325
                }
326
                /* We have to init the frame size at some point .... */
327
                pos2 = url_ftell(pb);
328
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
329
                    asf_st->ds_span = get_byte(pb);
330
                    asf_st->ds_packet_size = get_le16(pb);
331
                    asf_st->ds_chunk_size = get_le16(pb);
332
                    get_le16(pb); //ds_data_size
333
                    get_byte(pb); //ds_silence_data
334
                }
335
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
336
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
337
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
338
                if (asf_st->ds_span > 1) {
339
                    if (!asf_st->ds_chunk_size
340
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
341
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
342
                        asf_st->ds_span = 0; // disable descrambling
343
                }
344
                switch (st->codec->codec_id) {
345
                case CODEC_ID_MP3:
346
                    st->codec->frame_size = MPA_FRAME_SIZE;
347
                    break;
348
                case CODEC_ID_PCM_S16LE:
349
                case CODEC_ID_PCM_S16BE:
350
                case CODEC_ID_PCM_U16LE:
351
                case CODEC_ID_PCM_U16BE:
352
                case CODEC_ID_PCM_S8:
353
                case CODEC_ID_PCM_U8:
354
                case CODEC_ID_PCM_ALAW:
355
                case CODEC_ID_PCM_MULAW:
356
                    st->codec->frame_size = 1;
357
                    break;
358
                default:
359
                    /* This is probably wrong, but it prevents a crash later */
360
                    st->codec->frame_size = 1;
361
                    break;
362
                }
363
            } else if (type == AVMEDIA_TYPE_VIDEO &&
364
                       gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
365
                get_le32(pb);
366
                get_le32(pb);
367
                get_byte(pb);
368
                size = get_le16(pb); /* size */
369
                sizeX= get_le32(pb); /* size */
370
                st->codec->width = get_le32(pb);
371
                st->codec->height = get_le32(pb);
372
                /* not available for asf */
373
                get_le16(pb); /* panes */
374
                st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
375
                tag1 = get_le32(pb);
376
                url_fskip(pb, 20);
377
//                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
378
                size= sizeX;
379
                if (size > 40) {
380
                    st->codec->extradata_size = size - 40;
381
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
382
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
383
                }
384

    
385
                /* Extract palette from extradata if bpp <= 8 */
386
                /* This code assumes that extradata contains only palette */
387
                /* This is true for all paletted codecs implemented in ffmpeg */
388
                if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
389
                    st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
390
#if HAVE_BIGENDIAN
391
                    for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
392
                        st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
393
#else
394
                    memcpy(st->codec->palctrl->palette, st->codec->extradata,
395
                           FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
396
#endif
397
                    st->codec->palctrl->palette_changed = 1;
398
                }
399

    
400
                st->codec->codec_tag = tag1;
401
                st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
402
                if(tag1 == MKTAG('D', 'V', 'R', ' ')){
403
                    st->need_parsing = AVSTREAM_PARSE_FULL;
404
                    // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
405
                    st->codec->width  =
406
                    st->codec->height = 0;
407
                    av_freep(&st->codec->extradata);
408
                    st->codec->extradata_size=0;
409
                }
410
                if(st->codec->codec_id == CODEC_ID_H264)
411
                    st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
412
            }
413
            pos2 = url_ftell(pb);
414
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
415
        } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
416
            int len1, len2, len3, len4, len5;
417

    
418
            len1 = get_le16(pb);
419
            len2 = get_le16(pb);
420
            len3 = get_le16(pb);
421
            len4 = get_le16(pb);
422
            len5 = get_le16(pb);
423
            get_tag(s, "title"    , 0, len1);
424
            get_tag(s, "author"   , 0, len2);
425
            get_tag(s, "copyright", 0, len3);
426
            get_tag(s, "comment"  , 0, len4);
427
            url_fskip(pb, len5);
428
        } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
429
            int stream_count = get_le16(pb);
430
            int j;
431

    
432
//            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
433
//            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
434
            for(j = 0; j < stream_count; j++) {
435
                int flags, bitrate, stream_id;
436

    
437
                flags= get_le16(pb);
438
                bitrate= get_le32(pb);
439
                stream_id= (flags & 0x7f);
440
//                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
441
                asf->stream_bitrates[stream_id]= bitrate;
442
            }
443
        } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
444
            int j;
445
            int stream_count = get_le16(pb);
446
            for(j = 0; j < stream_count; j++) {
447
                char lang[6];
448
                unsigned int lang_len = get_byte(pb);
449
                if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
450
                    url_fskip(pb, lang_len - ret);
451
                if (j < 128)
452
                    av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
453
            }
454
        } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
455
            int desc_count, i;
456

    
457
            desc_count = get_le16(pb);
458
            for(i=0;i<desc_count;i++) {
459
                    int name_len,value_type,value_len;
460
                    char name[1024];
461

    
462
                    name_len = get_le16(pb);
463
                    if (name_len%2)     // must be even, broken lavf versions wrote len-1
464
                        name_len += 1;
465
                    if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
466
                        url_fskip(pb, name_len - ret);
467
                    value_type = get_le16(pb);
468
                    value_len  = get_le16(pb);
469
                    if (!value_type && value_len%2)
470
                        value_len += 1;
471
                    /**
472
                     * My sample has that stream set to 0 maybe that mean the container.
473
                     * Asf stream count start at 1. I am using 0 to the container value since it's unused
474
                     */
475
                    if (!strcmp(name, "AspectRatioX")){
476
                        asf->dar[0].num= get_value(s->pb, value_type);
477
                    } else if(!strcmp(name, "AspectRatioY")){
478
                        asf->dar[0].den= get_value(s->pb, value_type);
479
                    } else
480
                        get_tag(s, name, value_type, value_len);
481
            }
482
        } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
483
            int n, stream_num, name_len, value_len, value_type, value_num;
484
            n = get_le16(pb);
485

    
486
            for(i=0;i<n;i++) {
487
                char name[1024];
488

    
489
                get_le16(pb); //lang_list_index
490
                stream_num= get_le16(pb);
491
                name_len=   get_le16(pb);
492
                value_type= get_le16(pb);
493
                value_len=  get_le32(pb);
494

    
495
                if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
496
                    url_fskip(pb, name_len - ret);
497
//av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
498
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
499
                url_fskip(pb, value_len - 2);
500

    
501
                if(stream_num<128){
502
                    if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
503
                    else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
504
                }
505
            }
506
        } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
507
            int ext_len, payload_ext_ct, stream_ct;
508
            uint32_t ext_d, leak_rate, stream_num;
509
            unsigned int stream_languageid_index;
510

    
511
            get_le64(pb); // starttime
512
            get_le64(pb); // endtime
513
            leak_rate = get_le32(pb); // leak-datarate
514
            get_le32(pb); // bucket-datasize
515
            get_le32(pb); // init-bucket-fullness
516
            get_le32(pb); // alt-leak-datarate
517
            get_le32(pb); // alt-bucket-datasize
518
            get_le32(pb); // alt-init-bucket-fullness
519
            get_le32(pb); // max-object-size
520
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
521
            stream_num = get_le16(pb); // stream-num
522

    
523
            stream_languageid_index = get_le16(pb); // stream-language-id-index
524
            if (stream_num < 128)
525
                asf->streams[stream_num].stream_language_index = stream_languageid_index;
526

    
527
            get_le64(pb); // avg frametime in 100ns units
528
            stream_ct = get_le16(pb); //stream-name-count
529
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
530

    
531
            if (stream_num < 128)
532
                asf->stream_bitrates[stream_num] = leak_rate;
533

    
534
            for (i=0; i<stream_ct; i++){
535
                get_le16(pb);
536
                ext_len = get_le16(pb);
537
                url_fseek(pb, ext_len, SEEK_CUR);
538
            }
539

    
540
            for (i=0; i<payload_ext_ct; i++){
541
                ff_get_guid(pb, &g);
542
                ext_d=get_le16(pb);
543
                ext_len=get_le32(pb);
544
                url_fseek(pb, ext_len, SEEK_CUR);
545
            }
546

    
547
            // there could be a optional stream properties object to follow
548
            // if so the next iteration will pick it up
549
            continue;
550
        } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
551
            int v1, v2;
552
            ff_get_guid(pb, &g);
553
            v1 = get_le32(pb);
554
            v2 = get_le16(pb);
555
            continue;
556
        } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
557
            int i, count, name_len;
558
            char name[1024];
559

    
560
            get_le64(pb);            // reserved 16 bytes
561
            get_le64(pb);            // ...
562
            count = get_le32(pb);    // markers count
563
            get_le16(pb);            // reserved 2 bytes
564
            name_len = get_le16(pb); // name length
565
            for(i=0;i<name_len;i++){
566
                get_byte(pb); // skip the name
567
            }
568

    
569
            for(i=0;i<count;i++){
570
                int64_t pres_time;
571
                int name_len;
572

    
573
                get_le64(pb);             // offset, 8 bytes
574
                pres_time = get_le64(pb); // presentation time
575
                get_le16(pb);             // entry length
576
                get_le32(pb);             // send time
577
                get_le32(pb);             // flags
578
                name_len = get_le32(pb);  // name length
579
                if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
580
                    url_fskip(pb, name_len - ret);
581
                ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
582
            }
583
        } else if (url_feof(pb)) {
584
            return -1;
585
        } else {
586
            if (!s->keylen) {
587
                if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
588
                    av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
589
                } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
590
                    av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
591
                } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
592
                    av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
593
                }
594
            }
595
        }
596
        if(url_ftell(pb) != gpos + gsize)
597
            av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
598
        url_fseek(pb, gpos + gsize, SEEK_SET);
599
    }
600
    ff_get_guid(pb, &g);
601
    get_le64(pb);
602
    get_byte(pb);
603
    get_byte(pb);
604
    if (url_feof(pb))
605
        return -1;
606
    asf->data_offset = url_ftell(pb);
607
    asf->packet_size_left = 0;
608

    
609

    
610
    for(i=0; i<128; i++){
611
        int stream_num= asf->asfid2avid[i];
612
        if(stream_num>=0){
613
            AVStream *st = s->streams[stream_num];
614
            if (!st->codec->bit_rate)
615
                st->codec->bit_rate = asf->stream_bitrates[i];
616
            if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
617
                av_reduce(&st->sample_aspect_ratio.num,
618
                          &st->sample_aspect_ratio.den,
619
                          asf->dar[i].num, asf->dar[i].den, INT_MAX);
620
            } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
621
                av_reduce(&st->sample_aspect_ratio.num,
622
                          &st->sample_aspect_ratio.den,
623
                          asf->dar[0].num, asf->dar[0].den, INT_MAX);
624

    
625
//av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
626

    
627
            // copy and convert language codes to the frontend
628
            if (asf->streams[i].stream_language_index < 128) {
629
                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
630
                if (rfc1766 && strlen(rfc1766) > 1) {
631
                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
632
                    const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
633
                    if (iso6392)
634
                        av_metadata_set2(&st->metadata, "language", iso6392, 0);
635
                }
636
            }
637
        }
638
    }
639

    
640
    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
641

    
642
    return 0;
643
}
644

    
645
#define DO_2BITS(bits, var, defval) \
646
    switch (bits & 3) \
647
    { \
648
    case 3: var = get_le32(pb); rsize += 4; break; \
649
    case 2: var = get_le16(pb); rsize += 2; break; \
650
    case 1: var = get_byte(pb); rsize++; break; \
651
    default: var = defval; break; \
652
    }
653

    
654
/**
655
 * Load a single ASF packet into the demuxer.
656
 * @param s demux context
657
 * @param pb context to read data from
658
 * @return 0 on success, <0 on error
659
 */
660
static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
661
{
662
    ASFContext *asf = s->priv_data;
663
    uint32_t packet_length, padsize;
664
    int rsize = 8;
665
    int c, d, e, off;
666

    
667
    // if we do not know packet size, allow skipping up to 32 kB
668
    off= 32768;
669
    if (s->packet_size > 0)
670
        off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
671

    
672
    c=d=e=-1;
673
    while(off-- > 0){
674
        c=d; d=e;
675
        e= get_byte(pb);
676
        if(c == 0x82 && !d && !e)
677
            break;
678
    }
679

    
680
    if (c != 0x82) {
681
        /**
682
         * This code allows handling of -EAGAIN at packet boundaries (i.e.
683
         * if the packet sync code above triggers -EAGAIN). This does not
684
         * imply complete -EAGAIN handling support at random positions in
685
         * the stream.
686
         */
687
        if (url_ferror(pb) == AVERROR(EAGAIN))
688
            return AVERROR(EAGAIN);
689
        if (!url_feof(pb))
690
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
691
    }
692
    if ((c & 0x8f) == 0x82) {
693
        if (d || e) {
694
            if (!url_feof(pb))
695
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
696
            return -1;
697
        }
698
        c= get_byte(pb);
699
        d= get_byte(pb);
700
        rsize+=3;
701
    }else{
702
        url_fseek(pb, -1, SEEK_CUR); //FIXME
703
    }
704

    
705
    asf->packet_flags    = c;
706
    asf->packet_property = d;
707

    
708
    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
709
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
710
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
711

    
712
    //the following checks prevent overflows and infinite loops
713
    if(!packet_length || packet_length >= (1U<<29)){
714
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
715
        return -1;
716
    }
717
    if(padsize >= packet_length){
718
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
719
        return -1;
720
    }
721

    
722
    asf->packet_timestamp = get_le32(pb);
723
    get_le16(pb); /* duration */
724
    // rsize has at least 11 bytes which have to be present
725

    
726
    if (asf->packet_flags & 0x01) {
727
        asf->packet_segsizetype = get_byte(pb); rsize++;
728
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
729
    } else {
730
        asf->packet_segments = 1;
731
        asf->packet_segsizetype = 0x80;
732
    }
733
    asf->packet_size_left = packet_length - padsize - rsize;
734
    if (packet_length < asf->hdr.min_pktsize)
735
        padsize += asf->hdr.min_pktsize - packet_length;
736
    asf->packet_padsize = padsize;
737
    av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
738
    return 0;
739
}
740

    
741
/**
742
 *
743
 * @return <0 if error
744
 */
745
static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
746
    ASFContext *asf = s->priv_data;
747
    int rsize = 1;
748
    int num = get_byte(pb);
749
    int64_t ts0, ts1;
750

    
751
    asf->packet_segments--;
752
    asf->packet_key_frame = num >> 7;
753
    asf->stream_index = asf->asfid2avid[num & 0x7f];
754
    // sequence should be ignored!
755
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
756
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
757
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
758
//printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
759
    if (asf->packet_replic_size >= 8) {
760
        asf->packet_obj_size = get_le32(pb);
761
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
762
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
763
            return -1;
764
        }
765
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
766
        if(asf->packet_replic_size >= 8+38+4){
767
//            for(i=0; i<asf->packet_replic_size-8; i++)
768
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
769
//            av_log(s, AV_LOG_DEBUG, "\n");
770
            url_fskip(pb, 10);
771
            ts0= get_le64(pb);
772
            ts1= get_le64(pb);
773
            url_fskip(pb, 12);
774
            get_le32(pb);
775
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
776
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
777
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
778
        }else
779
            url_fskip(pb, asf->packet_replic_size - 8);
780
        rsize += asf->packet_replic_size; // FIXME - check validity
781
    } else if (asf->packet_replic_size==1){
782
        // multipacket - frag_offset is beginning timestamp
783
        asf->packet_time_start = asf->packet_frag_offset;
784
        asf->packet_frag_offset = 0;
785
        asf->packet_frag_timestamp = asf->packet_timestamp;
786

    
787
        asf->packet_time_delta = get_byte(pb);
788
        rsize++;
789
    }else if(asf->packet_replic_size!=0){
790
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
791
        return -1;
792
    }
793
    if (asf->packet_flags & 0x01) {
794
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
795
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
796
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
797
            return -1;
798
        }
799
        //printf("Fragsize %d\n", asf->packet_frag_size);
800
    } else {
801
        asf->packet_frag_size = asf->packet_size_left - rsize;
802
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
803
    }
804
    if (asf->packet_replic_size == 1) {
805
        asf->packet_multi_size = asf->packet_frag_size;
806
        if (asf->packet_multi_size > asf->packet_size_left)
807
            return -1;
808
    }
809
    asf->packet_size_left -= rsize;
810
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
811

    
812
    return 0;
813
}
814

    
815
/**
816
 * Parse data from individual ASF packets (which were previously loaded
817
 * with asf_get_packet()).
818
 * @param s demux context
819
 * @param pb context to read data from
820
 * @param pkt pointer to store packet data into
821
 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
822
 *          packets need to be loaded (through asf_get_packet())
823
 */
824
static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
825
{
826
    ASFContext *asf = s->priv_data;
827
    ASFStream *asf_st = 0;
828
    for (;;) {
829
        int ret;
830
        if(url_feof(pb))
831
            return AVERROR_EOF;
832
        if (asf->packet_size_left < FRAME_HEADER_SIZE
833
            || asf->packet_segments < 1) {
834
            //asf->packet_size_left <= asf->packet_padsize) {
835
            int ret = asf->packet_size_left + asf->packet_padsize;
836
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
837
            assert(ret>=0);
838
            /* fail safe */
839
            url_fskip(pb, ret);
840

    
841
            asf->packet_pos= url_ftell(pb);
842
            if (asf->data_object_size != (uint64_t)-1 &&
843
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
844
                return AVERROR_EOF; /* Do not exceed the size of the data object */
845
            return 1;
846
        }
847
        if (asf->packet_time_start == 0) {
848
            if(asf_read_frame_header(s, pb) < 0){
849
                asf->packet_segments= 0;
850
                continue;
851
            }
852
            if (asf->stream_index < 0
853
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
854
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
855
                ) {
856
                asf->packet_time_start = 0;
857
                /* unhandled packet (should not happen) */
858
                url_fskip(pb, asf->packet_frag_size);
859
                asf->packet_size_left -= asf->packet_frag_size;
860
                if(asf->stream_index < 0)
861
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
862
                continue;
863
            }
864
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
865
        }
866
        asf_st = asf->asf_st;
867

    
868
        if (asf->packet_replic_size == 1) {
869
            // frag_offset is here used as the beginning timestamp
870
            asf->packet_frag_timestamp = asf->packet_time_start;
871
            asf->packet_time_start += asf->packet_time_delta;
872
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
873
            asf->packet_size_left--;
874
            asf->packet_multi_size--;
875
            if (asf->packet_multi_size < asf->packet_obj_size)
876
            {
877
                asf->packet_time_start = 0;
878
                url_fskip(pb, asf->packet_multi_size);
879
                asf->packet_size_left -= asf->packet_multi_size;
880
                continue;
881
            }
882
            asf->packet_multi_size -= asf->packet_obj_size;
883
            //printf("COMPRESS size  %d  %d  %d   ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
884
        }
885
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
886
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
887
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
888
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
889
                asf_st->frag_offset, asf->packet_frag_size,
890
                asf->packet_obj_size, asf_st->pkt.size);
891
            asf->packet_obj_size= asf_st->pkt.size;
892
        }
893

    
894
        if (   asf_st->pkt.size != asf->packet_obj_size
895
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
896
            if(asf_st->pkt.data){
897
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
898
                asf_st->frag_offset = 0;
899
                av_free_packet(&asf_st->pkt);
900
            }
901
            /* new packet */
902
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
903
            asf_st->seq = asf->packet_seq;
904
            asf_st->pkt.dts = asf->packet_frag_timestamp;
905
            asf_st->pkt.stream_index = asf->stream_index;
906
            asf_st->pkt.pos =
907
            asf_st->packet_pos= asf->packet_pos;
908
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
909
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
910
//s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
911
            if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
912
                asf->packet_key_frame = 1;
913
            if (asf->packet_key_frame)
914
                asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
915
        }
916

    
917
        /* read data */
918
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
919
        //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
920
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
921
        asf->packet_size_left -= asf->packet_frag_size;
922
        if (asf->packet_size_left < 0)
923
            continue;
924

    
925
        if(   asf->packet_frag_offset >= asf_st->pkt.size
926
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
927
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
928
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
929
            continue;
930
        }
931

    
932
        ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
933
                         asf->packet_frag_size);
934
        if (ret != asf->packet_frag_size) {
935
            if (ret < 0 || asf->packet_frag_offset + ret == 0)
936
                return ret < 0 ? ret : AVERROR_EOF;
937
            if (asf_st->ds_span > 1) {
938
                // scrambling, we can either drop it completely or fill the remainder
939
                // TODO: should we fill the whole packet instead of just the current
940
                // fragment?
941
                memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
942
                       asf->packet_frag_size - ret);
943
                ret = asf->packet_frag_size;
944
            } else
945
                // no scrambling, so we can return partial packets
946
                av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
947
        }
948
        if (s->key && s->keylen == 20)
949
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
950
                            ret);
951
        asf_st->frag_offset += ret;
952
        /* test if whole packet is read */
953
        if (asf_st->frag_offset == asf_st->pkt.size) {
954
            //workaround for macroshit radio DVR-MS files
955
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
956
               && asf_st->pkt.size > 100){
957
                int i;
958
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
959
                if(i == asf_st->pkt.size){
960
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
961
                    asf_st->frag_offset = 0;
962
                    av_free_packet(&asf_st->pkt);
963
                    continue;
964
                }
965
            }
966

    
967
            /* return packet */
968
            if (asf_st->ds_span > 1) {
969
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
970
                    av_log(s, AV_LOG_ERROR, "pkt.size != ds_packet_size * ds_span (%d %d %d)\n", asf_st->pkt.size, asf_st->ds_packet_size, asf_st->ds_span);
971
              }else{
972
                /* packet descrambling */
973
                uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
974
                if (newdata) {
975
                    int offset = 0;
976
                    memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
977
                    while (offset < asf_st->pkt.size) {
978
                        int off = offset / asf_st->ds_chunk_size;
979
                        int row = off / asf_st->ds_span;
980
                        int col = off % asf_st->ds_span;
981
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
982
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
983

    
984
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
985
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
986
                        memcpy(newdata + offset,
987
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
988
                               asf_st->ds_chunk_size);
989
                        offset += asf_st->ds_chunk_size;
990
                    }
991
                    av_free(asf_st->pkt.data);
992
                    asf_st->pkt.data = newdata;
993
                }
994
              }
995
            }
996
            asf_st->frag_offset = 0;
997
            *pkt= asf_st->pkt;
998
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
999
            asf_st->pkt.size = 0;
1000
            asf_st->pkt.data = 0;
1001
            break; // packet completed
1002
        }
1003
    }
1004
    return 0;
1005
}
1006

    
1007
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1008
{
1009
    ASFContext *asf = s->priv_data;
1010

    
1011
    for (;;) {
1012
        int ret;
1013

    
1014
        /* parse cached packets, if any */
1015
        if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1016
            return ret;
1017
        if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1018
            assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1019
        asf->packet_time_start = 0;
1020
    }
1021

    
1022
    return 0;
1023
}
1024

    
1025
// Added to support seeking after packets have been read
1026
// If information is not reset, read_packet fails due to
1027
// leftover information from previous reads
1028
static void asf_reset_header(AVFormatContext *s)
1029
{
1030
    ASFContext *asf = s->priv_data;
1031
    ASFStream *asf_st;
1032
    int i;
1033

    
1034
    asf->packet_size_left = 0;
1035
    asf->packet_segments = 0;
1036
    asf->packet_flags = 0;
1037
    asf->packet_property = 0;
1038
    asf->packet_timestamp = 0;
1039
    asf->packet_segsizetype = 0;
1040
    asf->packet_segments = 0;
1041
    asf->packet_seq = 0;
1042
    asf->packet_replic_size = 0;
1043
    asf->packet_key_frame = 0;
1044
    asf->packet_padsize = 0;
1045
    asf->packet_frag_offset = 0;
1046
    asf->packet_frag_size = 0;
1047
    asf->packet_frag_timestamp = 0;
1048
    asf->packet_multi_size = 0;
1049
    asf->packet_obj_size = 0;
1050
    asf->packet_time_delta = 0;
1051
    asf->packet_time_start = 0;
1052

    
1053
    for(i=0; i<s->nb_streams; i++){
1054
        asf_st= s->streams[i]->priv_data;
1055
        av_free_packet(&asf_st->pkt);
1056
        asf_st->frag_offset=0;
1057
        asf_st->seq=0;
1058
    }
1059
    asf->asf_st= NULL;
1060
}
1061

    
1062
static int asf_read_close(AVFormatContext *s)
1063
{
1064
    int i;
1065

    
1066
    asf_reset_header(s);
1067
    for(i=0;i<s->nb_streams;i++) {
1068
        AVStream *st = s->streams[i];
1069
        av_free(st->codec->palctrl);
1070
    }
1071
    return 0;
1072
}
1073

    
1074
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1075
{
1076
    AVPacket pkt1, *pkt = &pkt1;
1077
    ASFStream *asf_st;
1078
    int64_t pts;
1079
    int64_t pos= *ppos;
1080
    int i;
1081
    int64_t start_pos[ASF_MAX_STREAMS];
1082

    
1083
    for(i=0; i<s->nb_streams; i++){
1084
        start_pos[i]= pos;
1085
    }
1086

    
1087
    if (s->packet_size > 0)
1088
        pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1089
    *ppos= pos;
1090
    url_fseek(s->pb, pos, SEEK_SET);
1091

    
1092
//printf("asf_read_pts\n");
1093
    asf_reset_header(s);
1094
    for(;;){
1095
        if (av_read_frame(s, pkt) < 0){
1096
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1097
            return AV_NOPTS_VALUE;
1098
        }
1099

    
1100
        pts= pkt->pts;
1101

    
1102
        av_free_packet(pkt);
1103
        if(pkt->flags&AV_PKT_FLAG_KEY){
1104
            i= pkt->stream_index;
1105

    
1106
            asf_st= s->streams[i]->priv_data;
1107

    
1108
//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1109
            pos= asf_st->packet_pos;
1110

    
1111
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1112
            start_pos[i]= asf_st->packet_pos + 1;
1113

    
1114
            if(pkt->stream_index == stream_index)
1115
               break;
1116
        }
1117
    }
1118

    
1119
    *ppos= pos;
1120
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1121

    
1122
    return pts;
1123
}
1124

    
1125
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1126
{
1127
    ff_asf_guid g;
1128
    ASFContext *asf = s->priv_data;
1129
    int64_t current_pos= url_ftell(s->pb);
1130
    int i;
1131

    
1132
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1133
    ff_get_guid(s->pb, &g);
1134

    
1135
    /* the data object can be followed by other top-level objects,
1136
       skip them until the simple index object is reached */
1137
    while (ff_guidcmp(&g, &index_guid)) {
1138
        int64_t gsize= get_le64(s->pb);
1139
        if (gsize < 24 || url_feof(s->pb)) {
1140
            url_fseek(s->pb, current_pos, SEEK_SET);
1141
            return;
1142
        }
1143
        url_fseek(s->pb, gsize-24, SEEK_CUR);
1144
        ff_get_guid(s->pb, &g);
1145
    }
1146

    
1147
    {
1148
        int64_t itime, last_pos=-1;
1149
        int pct, ict;
1150
        int64_t av_unused gsize= get_le64(s->pb);
1151
        ff_get_guid(s->pb, &g);
1152
        itime=get_le64(s->pb);
1153
        pct=get_le32(s->pb);
1154
        ict=get_le32(s->pb);
1155
        av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1156

    
1157
        for (i=0;i<ict;i++){
1158
            int pktnum=get_le32(s->pb);
1159
            int pktct =get_le16(s->pb);
1160
            int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1161
            int64_t index_pts= av_rescale(itime, i, 10000);
1162

    
1163
            if(pos != last_pos){
1164
            av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1165
            av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1166
            last_pos=pos;
1167
            }
1168
        }
1169
        asf->index_read= 1;
1170
    }
1171
    url_fseek(s->pb, current_pos, SEEK_SET);
1172
}
1173

    
1174
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1175
{
1176
    ASFContext *asf = s->priv_data;
1177
    AVStream *st = s->streams[stream_index];
1178
    int64_t pos;
1179
    int index;
1180

    
1181
    if (s->packet_size <= 0)
1182
        return -1;
1183

    
1184
    /* Try using the protocol's read_seek if available */
1185
    if(s->pb) {
1186
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1187
        if(ret >= 0)
1188
            asf_reset_header(s);
1189
        if (ret != AVERROR(ENOSYS))
1190
            return ret;
1191
    }
1192

    
1193
    if (!asf->index_read)
1194
        asf_build_simple_index(s, stream_index);
1195

    
1196
    if(!(asf->index_read && st->index_entries)){
1197
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1198
            return -1;
1199
    }else{
1200
        index= av_index_search_timestamp(st, pts, flags);
1201
        if(index<0)
1202
            return -1;
1203

    
1204
        /* find the position */
1205
        pos = st->index_entries[index].pos;
1206

    
1207
    // various attempts to find key frame have failed so far
1208
    //    asf_reset_header(s);
1209
    //    url_fseek(s->pb, pos, SEEK_SET);
1210
    //    key_pos = pos;
1211
    //     for(i=0;i<16;i++){
1212
    //         pos = url_ftell(s->pb);
1213
    //         if (av_read_frame(s, &pkt) < 0){
1214
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1215
    //             return -1;
1216
    //         }
1217
    //         asf_st = s->streams[stream_index]->priv_data;
1218
    //         pos += st->parser->frame_offset;
1219
    //
1220
    //         if (pkt.size > b) {
1221
    //             b = pkt.size;
1222
    //             key_pos = pos;
1223
    //         }
1224
    //
1225
    //         av_free_packet(&pkt);
1226
    //     }
1227

    
1228
        /* do the seek */
1229
        av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1230
        url_fseek(s->pb, pos, SEEK_SET);
1231
    }
1232
    asf_reset_header(s);
1233
    return 0;
1234
}
1235

    
1236
AVInputFormat ff_asf_demuxer = {
1237
    "asf",
1238
    NULL_IF_CONFIG_SMALL("ASF format"),
1239
    sizeof(ASFContext),
1240
    asf_probe,
1241
    asf_read_header,
1242
    asf_read_packet,
1243
    asf_read_close,
1244
    asf_read_seek,
1245
    asf_read_pts,
1246
};