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ffmpeg / libavformat / asfdec.c @ 6538c0f1

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1
/*
2
 * ASF compatible demuxer
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
4
 *
5
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
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 *
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 * 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
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 */
21

    
22
//#define DEBUG
23

    
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#include "libavutil/common.h"
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#include "libavutil/avstring.h"
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#include "libavcodec/mpegaudio.h"
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#include "avformat.h"
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#include "riff.h"
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#include "asf.h"
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#include "asfcrypt.h"
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#include "avlanguage.h"
32

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

    
35
#undef NDEBUG
36
#include <assert.h>
37

    
38
#define FRAME_HEADER_SIZE 17
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// Fix Me! FRAME_HEADER_SIZE may be different.
40

    
41
static const ff_asf_guid index_guid = {
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    0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
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};
44

    
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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
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};
48
/**********************************/
49
/* decoding */
50

    
51
static int guidcmp(const void *g1, const void *g2)
52
{
53
    return memcmp(g1, g2, sizeof(ff_asf_guid));
54
}
55

    
56
#ifdef DEBUG
57
#define PRINT_IF_GUID(g,cmp) \
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if (!guidcmp(g, &cmp)) \
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    dprintf(NULL, "(GUID: %s) ", #cmp)
60

    
61
static void print_guid(const ff_asf_guid *g)
62
{
63
    int i;
64
    PRINT_IF_GUID(g, ff_asf_header);
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    else PRINT_IF_GUID(g, ff_asf_file_header);
66
    else PRINT_IF_GUID(g, ff_asf_stream_header);
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    else PRINT_IF_GUID(g, ff_asf_audio_stream);
68
    else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
69
    else PRINT_IF_GUID(g, ff_asf_video_stream);
70
    else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
71
    else PRINT_IF_GUID(g, ff_asf_command_stream);
72
    else PRINT_IF_GUID(g, ff_asf_comment_header);
73
    else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
74
    else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
75
    else PRINT_IF_GUID(g, ff_asf_data_header);
76
    else PRINT_IF_GUID(g, index_guid);
77
    else PRINT_IF_GUID(g, ff_asf_head1_guid);
78
    else PRINT_IF_GUID(g, ff_asf_head2_guid);
79
    else PRINT_IF_GUID(g, ff_asf_my_guid);
80
    else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
81
    else PRINT_IF_GUID(g, ff_asf_extended_content_header);
82
    else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
83
    else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
84
    else PRINT_IF_GUID(g, ff_asf_metadata_header);
85
    else PRINT_IF_GUID(g, stream_bitrate_guid);
86
    else PRINT_IF_GUID(g, ff_asf_language_guid);
87
    else
88
        dprintf(NULL, "(GUID: unknown) ");
89
    for(i=0;i<16;i++)
90
        dprintf(NULL, " 0x%02x,", (*g)[i]);
91
    dprintf(NULL, "}\n");
92
}
93
#undef PRINT_IF_GUID
94
#else
95
#define print_guid(g)
96
#endif
97

    
98
static void get_guid(ByteIOContext *s, ff_asf_guid *g)
99
{
100
    assert(sizeof(*g) == 16);
101
    get_buffer(s, *g, sizeof(*g));
102
}
103

    
104
#if 0
105
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
106
{
107
    int len, c;
108
    char *q;
109

110
    len = get_le16(pb);
111
    q = buf;
112
    while (len > 0) {
113
        c = get_le16(pb);
114
        if ((q - buf) < buf_size - 1)
115
            *q++ = c;
116
        len--;
117
    }
118
    *q = '\0';
119
}
120
#endif
121

    
122
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
123
{
124
    char* q = buf;
125
    for (; len > 1; len -= 2) {
126
        uint8_t tmp;
127
        PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
128
    }
129
    if (len > 0)
130
        url_fskip(pb, len);
131
    *q = '\0';
132
}
133

    
134
static int asf_probe(AVProbeData *pd)
135
{
136
    /* check file header */
137
    if (!guidcmp(pd->buf, &ff_asf_header))
138
        return AVPROBE_SCORE_MAX;
139
    else
140
        return 0;
141
}
142

    
143
static int get_value(ByteIOContext *pb, int type){
144
    switch(type){
145
        case 2: return get_le32(pb);
146
        case 3: return get_le32(pb);
147
        case 4: return get_le64(pb);
148
        case 5: return get_le16(pb);
149
        default:return INT_MIN;
150
    }
151
}
152

    
153
static void get_tag(AVFormatContext *s, const char *key, int type, int len)
154
{
155
    char *value;
156

    
157
    if ((unsigned)len >= UINT_MAX)
158
        return;
159

    
160
    value = av_malloc(len+1);
161
    if (!value)
162
        return;
163

    
164
    if (type == 0) {         // UTF16-LE
165
        get_str16_nolen(s->pb, len, value, len);
166
    } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
167
        uint64_t num = get_value(s->pb, type);
168
        snprintf(value, len, "%"PRIu64, num);
169
    } else {
170
        url_fskip(s->pb, len);
171
        av_freep(&value);
172
        av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
173
        return;
174
    }
175
    if (!strncmp(key, "WM/", 3))
176
        key += 3;
177
    av_metadata_set2(&s->metadata, key, value, AV_METADATA_DONT_STRDUP_VAL);
178
}
179

    
180
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
181
{
182
    ASFContext *asf = s->priv_data;
183
    ff_asf_guid g;
184
    ByteIOContext *pb = s->pb;
185
    AVStream *st;
186
    ASFStream *asf_st;
187
    int size, i;
188
    int64_t gsize;
189
    AVRational dar[128];
190
    uint32_t bitrate[128];
191

    
192
    memset(dar, 0, sizeof(dar));
193
    memset(bitrate, 0, sizeof(bitrate));
194

    
195
    get_guid(pb, &g);
196
    if (guidcmp(&g, &ff_asf_header))
197
        return -1;
198
    get_le64(pb);
199
    get_le32(pb);
200
    get_byte(pb);
201
    get_byte(pb);
202
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
203
    for(;;) {
204
        get_guid(pb, &g);
205
        gsize = get_le64(pb);
206
        dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
207
        print_guid(&g);
208
        dprintf(s, "  size=0x%"PRIx64"\n", gsize);
209
        if (!guidcmp(&g, &ff_asf_data_header)) {
210
            asf->data_object_offset = url_ftell(pb);
211
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
212
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
213
                asf->data_object_size = gsize - 24;
214
            } else {
215
                asf->data_object_size = (uint64_t)-1;
216
            }
217
            break;
218
        }
219
        if (gsize < 24)
220
            return -1;
221
        if (!guidcmp(&g, &ff_asf_file_header)) {
222
            get_guid(pb, &asf->hdr.guid);
223
            asf->hdr.file_size          = get_le64(pb);
224
            asf->hdr.create_time        = get_le64(pb);
225
            asf->nb_packets             = get_le64(pb);
226
            asf->hdr.play_time          = get_le64(pb);
227
            asf->hdr.send_time          = get_le64(pb);
228
            asf->hdr.preroll            = get_le32(pb);
229
            asf->hdr.ignore             = get_le32(pb);
230
            asf->hdr.flags              = get_le32(pb);
231
            asf->hdr.min_pktsize        = get_le32(pb);
232
            asf->hdr.max_pktsize        = get_le32(pb);
233
            asf->hdr.max_bitrate        = get_le32(pb);
234
            s->packet_size = asf->hdr.max_pktsize;
235
        } else if (!guidcmp(&g, &ff_asf_stream_header)) {
236
            enum CodecType type;
237
            int type_specific_size, sizeX;
238
            uint64_t total_size;
239
            unsigned int tag1;
240
            int64_t pos1, pos2, start_time;
241
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
242

    
243
            pos1 = url_ftell(pb);
244

    
245
            st = av_new_stream(s, 0);
246
            if (!st)
247
                return AVERROR(ENOMEM);
248
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
249
            asf_st = av_mallocz(sizeof(ASFStream));
250
            if (!asf_st)
251
                return AVERROR(ENOMEM);
252
            st->priv_data = asf_st;
253
            start_time = asf->hdr.preroll;
254

    
255
            asf_st->stream_language_index = 128; // invalid stream index means no language info
256

    
257
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
258
                st->duration = asf->hdr.play_time /
259
                    (10000000 / 1000) - start_time;
260
            }
261
            get_guid(pb, &g);
262

    
263
            test_for_ext_stream_audio = 0;
264
            if (!guidcmp(&g, &ff_asf_audio_stream)) {
265
                type = CODEC_TYPE_AUDIO;
266
            } else if (!guidcmp(&g, &ff_asf_video_stream)) {
267
                type = CODEC_TYPE_VIDEO;
268
            } else if (!guidcmp(&g, &ff_asf_command_stream)) {
269
                type = CODEC_TYPE_DATA;
270
            } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
271
                test_for_ext_stream_audio = 1;
272
                type = CODEC_TYPE_UNKNOWN;
273
            } else {
274
                return -1;
275
            }
276
            get_guid(pb, &g);
277
            total_size = get_le64(pb);
278
            type_specific_size = get_le32(pb);
279
            get_le32(pb);
280
            st->id = get_le16(pb) & 0x7f; /* stream id */
281
            // mapping of asf ID to AV stream ID;
282
            asf->asfid2avid[st->id] = s->nb_streams - 1;
283

    
284
            get_le32(pb);
285

    
286
            if (test_for_ext_stream_audio) {
287
                get_guid(pb, &g);
288
                if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
289
                    type = CODEC_TYPE_AUDIO;
290
                    is_dvr_ms_audio=1;
291
                    get_guid(pb, &g);
292
                    get_le32(pb);
293
                    get_le32(pb);
294
                    get_le32(pb);
295
                    get_guid(pb, &g);
296
                    get_le32(pb);
297
                }
298
            }
299

    
300
            st->codec->codec_type = type;
301
            if (type == CODEC_TYPE_AUDIO) {
302
                ff_get_wav_header(pb, st->codec, type_specific_size);
303
                if (is_dvr_ms_audio) {
304
                    // codec_id and codec_tag are unreliable in dvr_ms
305
                    // files. Set them later by probing stream.
306
                    st->codec->codec_id = CODEC_ID_PROBE;
307
                    st->codec->codec_tag = 0;
308
                }
309
                if (st->codec->codec_id == CODEC_ID_AAC) {
310
                    st->need_parsing = AVSTREAM_PARSE_NONE;
311
                } else {
312
                    st->need_parsing = AVSTREAM_PARSE_FULL;
313
                }
314
                /* We have to init the frame size at some point .... */
315
                pos2 = url_ftell(pb);
316
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
317
                    asf_st->ds_span = get_byte(pb);
318
                    asf_st->ds_packet_size = get_le16(pb);
319
                    asf_st->ds_chunk_size = get_le16(pb);
320
                    get_le16(pb); //ds_data_size
321
                    get_byte(pb); //ds_silence_data
322
                }
323
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
324
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
325
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
326
                if (asf_st->ds_span > 1) {
327
                    if (!asf_st->ds_chunk_size
328
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
329
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
330
                        asf_st->ds_span = 0; // disable descrambling
331
                }
332
                switch (st->codec->codec_id) {
333
                case CODEC_ID_MP3:
334
                    st->codec->frame_size = MPA_FRAME_SIZE;
335
                    break;
336
                case CODEC_ID_PCM_S16LE:
337
                case CODEC_ID_PCM_S16BE:
338
                case CODEC_ID_PCM_U16LE:
339
                case CODEC_ID_PCM_U16BE:
340
                case CODEC_ID_PCM_S8:
341
                case CODEC_ID_PCM_U8:
342
                case CODEC_ID_PCM_ALAW:
343
                case CODEC_ID_PCM_MULAW:
344
                    st->codec->frame_size = 1;
345
                    break;
346
                default:
347
                    /* This is probably wrong, but it prevents a crash later */
348
                    st->codec->frame_size = 1;
349
                    break;
350
                }
351
            } else if (type == CODEC_TYPE_VIDEO) {
352
                get_le32(pb);
353
                get_le32(pb);
354
                get_byte(pb);
355
                size = get_le16(pb); /* size */
356
                sizeX= get_le32(pb); /* size */
357
                st->codec->width = get_le32(pb);
358
                st->codec->height = get_le32(pb);
359
                /* not available for asf */
360
                get_le16(pb); /* panes */
361
                st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
362
                tag1 = get_le32(pb);
363
                url_fskip(pb, 20);
364
//                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
365
                size= sizeX;
366
                if (size > 40) {
367
                    st->codec->extradata_size = size - 40;
368
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
369
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
370
                }
371

    
372
                /* Extract palette from extradata if bpp <= 8 */
373
                /* This code assumes that extradata contains only palette */
374
                /* This is true for all paletted codecs implemented in ffmpeg */
375
                if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
376
                    st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
377
#if HAVE_BIGENDIAN
378
                    for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
379
                        st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
380
#else
381
                    memcpy(st->codec->palctrl->palette, st->codec->extradata,
382
                           FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
383
#endif
384
                    st->codec->palctrl->palette_changed = 1;
385
                }
386

    
387
                st->codec->codec_tag = tag1;
388
                st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
389
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
390
                    st->need_parsing = AVSTREAM_PARSE_FULL;
391
            }
392
            pos2 = url_ftell(pb);
393
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
394
        } else if (!guidcmp(&g, &ff_asf_comment_header)) {
395
            int len1, len2, len3, len4, len5;
396

    
397
            len1 = get_le16(pb);
398
            len2 = get_le16(pb);
399
            len3 = get_le16(pb);
400
            len4 = get_le16(pb);
401
            len5 = get_le16(pb);
402
            get_tag(s, "title"    , 0, len1);
403
            get_tag(s, "author"   , 0, len2);
404
            get_tag(s, "copyright", 0, len3);
405
            get_tag(s, "comment"  , 0, len4);
406
            url_fskip(pb, len5);
407
        } else if (!guidcmp(&g, &stream_bitrate_guid)) {
408
            int stream_count = get_le16(pb);
409
            int j;
410

    
411
//            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
412
//            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
413
            for(j = 0; j < stream_count; j++) {
414
                int flags, bitrate, stream_id;
415

    
416
                flags= get_le16(pb);
417
                bitrate= get_le32(pb);
418
                stream_id= (flags & 0x7f);
419
//                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
420
                asf->stream_bitrates[stream_id]= bitrate;
421
            }
422
        } else if (!guidcmp(&g, &ff_asf_language_guid)) {
423
            int j;
424
            int stream_count = get_le16(pb);
425
            for(j = 0; j < stream_count; j++) {
426
                char lang[6];
427
                unsigned int lang_len = get_byte(pb);
428
                get_str16_nolen(pb, lang_len, lang, sizeof(lang));
429
                if (j < 128)
430
                    av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
431
            }
432
        } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
433
            int desc_count, i;
434

    
435
            desc_count = get_le16(pb);
436
            for(i=0;i<desc_count;i++) {
437
                    int name_len,value_type,value_len;
438
                    char name[1024];
439

    
440
                    name_len = get_le16(pb);
441
                    if (name_len%2)     // must be even, broken lavf versions wrote len-1
442
                        name_len += 1;
443
                    get_str16_nolen(pb, name_len, name, sizeof(name));
444
                    value_type = get_le16(pb);
445
                    value_len  = get_le16(pb);
446
                    if (!value_type && value_len%2)
447
                        value_len += 1;
448
                    get_tag(s, name, value_type, value_len);
449
            }
450
        } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
451
            int n, stream_num, name_len, value_len, value_type, value_num;
452
            n = get_le16(pb);
453

    
454
            for(i=0;i<n;i++) {
455
                char name[1024];
456

    
457
                get_le16(pb); //lang_list_index
458
                stream_num= get_le16(pb);
459
                name_len=   get_le16(pb);
460
                value_type= get_le16(pb);
461
                value_len=  get_le32(pb);
462

    
463
                get_str16_nolen(pb, name_len, name, sizeof(name));
464
//av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
465
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
466
                url_fskip(pb, value_len - 2);
467

    
468
                if(stream_num<128){
469
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
470
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
471
                }
472
            }
473
        } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
474
            int ext_len, payload_ext_ct, stream_ct;
475
            uint32_t ext_d, leak_rate, stream_num;
476
            unsigned int stream_languageid_index;
477

    
478
            get_le64(pb); // starttime
479
            get_le64(pb); // endtime
480
            leak_rate = get_le32(pb); // leak-datarate
481
            get_le32(pb); // bucket-datasize
482
            get_le32(pb); // init-bucket-fullness
483
            get_le32(pb); // alt-leak-datarate
484
            get_le32(pb); // alt-bucket-datasize
485
            get_le32(pb); // alt-init-bucket-fullness
486
            get_le32(pb); // max-object-size
487
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
488
            stream_num = get_le16(pb); // stream-num
489

    
490
            stream_languageid_index = get_le16(pb); // stream-language-id-index
491
            if (stream_num < 128)
492
                asf->streams[stream_num].stream_language_index = stream_languageid_index;
493

    
494
            get_le64(pb); // avg frametime in 100ns units
495
            stream_ct = get_le16(pb); //stream-name-count
496
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
497

    
498
            if (stream_num < 128)
499
                bitrate[stream_num] = leak_rate;
500

    
501
            for (i=0; i<stream_ct; i++){
502
                get_le16(pb);
503
                ext_len = get_le16(pb);
504
                url_fseek(pb, ext_len, SEEK_CUR);
505
            }
506

    
507
            for (i=0; i<payload_ext_ct; i++){
508
                get_guid(pb, &g);
509
                ext_d=get_le16(pb);
510
                ext_len=get_le32(pb);
511
                url_fseek(pb, ext_len, SEEK_CUR);
512
            }
513

    
514
            // there could be a optional stream properties object to follow
515
            // if so the next iteration will pick it up
516
        } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
517
            int v1, v2;
518
            get_guid(pb, &g);
519
            v1 = get_le32(pb);
520
            v2 = get_le16(pb);
521
#if 0
522
        } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
523
            int len, v1, n, num;
524
            char str[256], *q;
525
            char tag[16];
526

527
            get_guid(pb, &g);
528
            print_guid(&g);
529

530
            n = get_le32(pb);
531
            for(i=0;i<n;i++) {
532
                num = get_le16(pb); /* stream number */
533
                get_str16(pb, str, sizeof(str));
534
                get_str16(pb, str, sizeof(str));
535
                len = get_le16(pb);
536
                q = tag;
537
                while (len > 0) {
538
                    v1 = get_byte(pb);
539
                    if ((q - tag) < sizeof(tag) - 1)
540
                        *q++ = v1;
541
                    len--;
542
                }
543
                *q = '\0';
544
            }
545
#endif
546
        } else if (url_feof(pb)) {
547
            return -1;
548
        } else {
549
            if (!s->keylen) {
550
                if (!guidcmp(&g, &ff_asf_content_encryption)) {
551
                    av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
552
                } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
553
                    av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
554
                } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
555
                    av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
556
                }
557
            }
558
            url_fseek(pb, gsize - 24, SEEK_CUR);
559
        }
560
    }
561
    get_guid(pb, &g);
562
    get_le64(pb);
563
    get_byte(pb);
564
    get_byte(pb);
565
    if (url_feof(pb))
566
        return -1;
567
    asf->data_offset = url_ftell(pb);
568
    asf->packet_size_left = 0;
569

    
570

    
571
    for(i=0; i<128; i++){
572
        int stream_num= asf->asfid2avid[i];
573
        if(stream_num>=0){
574
            AVStream *st = s->streams[stream_num];
575
            if (!st->codec->bit_rate)
576
                st->codec->bit_rate = bitrate[i];
577
            if (dar[i].num > 0 && dar[i].den > 0)
578
                av_reduce(&st->sample_aspect_ratio.num,
579
                          &st->sample_aspect_ratio.den,
580
                          dar[i].num, dar[i].den, INT_MAX);
581
//av_log(s, AV_LOG_ERROR, "dar %d:%d sar=%d:%d\n", dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
582

    
583
            // copy and convert language codes to the frontend
584
            if (asf->streams[i].stream_language_index < 128) {
585
                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
586
                if (rfc1766 && strlen(rfc1766) > 1) {
587
                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
588
                    const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
589
                    if (iso6392)
590
                        av_metadata_set(&st->metadata, "language", iso6392);
591
                }
592
            }
593
        }
594
    }
595

    
596
    return 0;
597
}
598

    
599
#define DO_2BITS(bits, var, defval) \
600
    switch (bits & 3) \
601
    { \
602
    case 3: var = get_le32(pb); rsize += 4; break; \
603
    case 2: var = get_le16(pb); rsize += 2; break; \
604
    case 1: var = get_byte(pb); rsize++; break; \
605
    default: var = defval; break; \
606
    }
607

    
608
/**
609
 * Load a single ASF packet into the demuxer.
610
 * @param s demux context
611
 * @param pb context to read data from
612
 * @returns 0 on success, <0 on error
613
 */
614
static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
615
{
616
    ASFContext *asf = s->priv_data;
617
    uint32_t packet_length, padsize;
618
    int rsize = 8;
619
    int c, d, e, off;
620

    
621
    // if we do not know packet size, allow skipping up to 32 kB
622
    off= 32768;
623
    if (s->packet_size > 0)
624
        off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
625

    
626
    c=d=e=-1;
627
    while(off-- > 0){
628
        c=d; d=e;
629
        e= get_byte(pb);
630
        if(c == 0x82 && !d && !e)
631
            break;
632
    }
633

    
634
    if (c != 0x82) {
635
        /**
636
         * This code allows handling of -EAGAIN at packet boundaries (i.e.
637
         * if the packet sync code above triggers -EAGAIN). This does not
638
         * imply complete -EAGAIN handling support at random positions in
639
         * the stream.
640
         */
641
        if (url_ferror(pb) == AVERROR(EAGAIN))
642
            return AVERROR(EAGAIN);
643
        if (!url_feof(pb))
644
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
645
    }
646
    if ((c & 0x8f) == 0x82) {
647
        if (d || e) {
648
            if (!url_feof(pb))
649
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
650
            return -1;
651
        }
652
        c= get_byte(pb);
653
        d= get_byte(pb);
654
        rsize+=3;
655
    }else{
656
        url_fseek(pb, -1, SEEK_CUR); //FIXME
657
    }
658

    
659
    asf->packet_flags    = c;
660
    asf->packet_property = d;
661

    
662
    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
663
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
664
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
665

    
666
    //the following checks prevent overflows and infinite loops
667
    if(!packet_length || packet_length >= (1U<<29)){
668
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
669
        return -1;
670
    }
671
    if(padsize >= packet_length){
672
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
673
        return -1;
674
    }
675

    
676
    asf->packet_timestamp = get_le32(pb);
677
    get_le16(pb); /* duration */
678
    // rsize has at least 11 bytes which have to be present
679

    
680
    if (asf->packet_flags & 0x01) {
681
        asf->packet_segsizetype = get_byte(pb); rsize++;
682
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
683
    } else {
684
        asf->packet_segments = 1;
685
        asf->packet_segsizetype = 0x80;
686
    }
687
    asf->packet_size_left = packet_length - padsize - rsize;
688
    if (packet_length < asf->hdr.min_pktsize)
689
        padsize += asf->hdr.min_pktsize - packet_length;
690
    asf->packet_padsize = padsize;
691
    dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
692
    return 0;
693
}
694

    
695
/**
696
 *
697
 * @return <0 if error
698
 */
699
static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
700
    ASFContext *asf = s->priv_data;
701
    int rsize = 1;
702
    int num = get_byte(pb);
703
    int64_t ts0, ts1;
704

    
705
    asf->packet_segments--;
706
    asf->packet_key_frame = num >> 7;
707
    asf->stream_index = asf->asfid2avid[num & 0x7f];
708
    // sequence should be ignored!
709
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
710
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
711
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
712
//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);
713
    if (asf->packet_replic_size >= 8) {
714
        asf->packet_obj_size = get_le32(pb);
715
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
716
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
717
            return -1;
718
        }
719
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
720
        if(asf->packet_replic_size >= 8+38+4){
721
//            for(i=0; i<asf->packet_replic_size-8; i++)
722
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
723
//            av_log(s, AV_LOG_DEBUG, "\n");
724
            url_fskip(pb, 10);
725
            ts0= get_le64(pb);
726
            ts1= get_le64(pb);
727
            url_fskip(pb, 12);
728
            get_le32(pb);
729
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
730
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
731
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
732
        }else
733
            url_fskip(pb, asf->packet_replic_size - 8);
734
        rsize += asf->packet_replic_size; // FIXME - check validity
735
    } else if (asf->packet_replic_size==1){
736
        // multipacket - frag_offset is beginning timestamp
737
        asf->packet_time_start = asf->packet_frag_offset;
738
        asf->packet_frag_offset = 0;
739
        asf->packet_frag_timestamp = asf->packet_timestamp;
740

    
741
        asf->packet_time_delta = get_byte(pb);
742
        rsize++;
743
    }else if(asf->packet_replic_size!=0){
744
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
745
        return -1;
746
    }
747
    if (asf->packet_flags & 0x01) {
748
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
749
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
750
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
751
            return -1;
752
        }
753
        //printf("Fragsize %d\n", asf->packet_frag_size);
754
    } else {
755
        asf->packet_frag_size = asf->packet_size_left - rsize;
756
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
757
    }
758
    if (asf->packet_replic_size == 1) {
759
        asf->packet_multi_size = asf->packet_frag_size;
760
        if (asf->packet_multi_size > asf->packet_size_left)
761
            return -1;
762
    }
763
    asf->packet_size_left -= rsize;
764
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
765

    
766
    return 0;
767
}
768

    
769
/**
770
 * Parse data from individual ASF packets (which were previously loaded
771
 * with asf_get_packet()).
772
 * @param s demux context
773
 * @param pb context to read data from
774
 * @param pkt pointer to store packet data into
775
 * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
776
 *          packets need to be loaded (through asf_get_packet())
777
 */
778
static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
779
{
780
    ASFContext *asf = s->priv_data;
781
    ASFStream *asf_st = 0;
782
    for (;;) {
783
        if(url_feof(pb))
784
            return AVERROR_EOF;
785
        if (asf->packet_size_left < FRAME_HEADER_SIZE
786
            || asf->packet_segments < 1) {
787
            //asf->packet_size_left <= asf->packet_padsize) {
788
            int ret = asf->packet_size_left + asf->packet_padsize;
789
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
790
            assert(ret>=0);
791
            /* fail safe */
792
            url_fskip(pb, ret);
793

    
794
            asf->packet_pos= url_ftell(pb);
795
            if (asf->data_object_size != (uint64_t)-1 &&
796
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
797
                return AVERROR_EOF; /* Do not exceed the size of the data object */
798
            return 1;
799
        }
800
        if (asf->packet_time_start == 0) {
801
            if(asf_read_frame_header(s, pb) < 0){
802
                asf->packet_segments= 0;
803
                continue;
804
            }
805
            if (asf->stream_index < 0
806
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
807
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
808
                ) {
809
                asf->packet_time_start = 0;
810
                /* unhandled packet (should not happen) */
811
                url_fskip(pb, asf->packet_frag_size);
812
                asf->packet_size_left -= asf->packet_frag_size;
813
                if(asf->stream_index < 0)
814
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
815
                continue;
816
            }
817
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
818
        }
819
        asf_st = asf->asf_st;
820

    
821
        if (asf->packet_replic_size == 1) {
822
            // frag_offset is here used as the beginning timestamp
823
            asf->packet_frag_timestamp = asf->packet_time_start;
824
            asf->packet_time_start += asf->packet_time_delta;
825
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
826
            asf->packet_size_left--;
827
            asf->packet_multi_size--;
828
            if (asf->packet_multi_size < asf->packet_obj_size)
829
            {
830
                asf->packet_time_start = 0;
831
                url_fskip(pb, asf->packet_multi_size);
832
                asf->packet_size_left -= asf->packet_multi_size;
833
                continue;
834
            }
835
            asf->packet_multi_size -= asf->packet_obj_size;
836
            //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);
837
        }
838
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
839
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
840
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
841
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
842
                asf_st->frag_offset, asf->packet_frag_size,
843
                asf->packet_obj_size, asf_st->pkt.size);
844
            asf->packet_obj_size= asf_st->pkt.size;
845
        }
846

    
847
        if (   asf_st->pkt.size != asf->packet_obj_size
848
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
849
            if(asf_st->pkt.data){
850
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
851
                asf_st->frag_offset = 0;
852
                av_free_packet(&asf_st->pkt);
853
            }
854
            /* new packet */
855
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
856
            asf_st->seq = asf->packet_seq;
857
            asf_st->pkt.dts = asf->packet_frag_timestamp;
858
            asf_st->pkt.stream_index = asf->stream_index;
859
            asf_st->pkt.pos =
860
            asf_st->packet_pos= asf->packet_pos;
861
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
862
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
863
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
864
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
865
                asf->packet_key_frame = 1;
866
            if (asf->packet_key_frame)
867
                asf_st->pkt.flags |= PKT_FLAG_KEY;
868
        }
869

    
870
        /* read data */
871
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
872
        //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
873
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
874
        asf->packet_size_left -= asf->packet_frag_size;
875
        if (asf->packet_size_left < 0)
876
            continue;
877

    
878
        if(   asf->packet_frag_offset >= asf_st->pkt.size
879
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
880
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
881
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
882
            continue;
883
        }
884

    
885
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
886
                   asf->packet_frag_size);
887
        if (s->key && s->keylen == 20)
888
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
889
                            asf->packet_frag_size);
890
        asf_st->frag_offset += asf->packet_frag_size;
891
        /* test if whole packet is read */
892
        if (asf_st->frag_offset == asf_st->pkt.size) {
893
            //workaround for macroshit radio DVR-MS files
894
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
895
               && asf_st->pkt.size > 100){
896
                int i;
897
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
898
                if(i == asf_st->pkt.size){
899
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
900
                    asf_st->frag_offset = 0;
901
                    av_free_packet(&asf_st->pkt);
902
                    continue;
903
                }
904
            }
905

    
906
            /* return packet */
907
            if (asf_st->ds_span > 1) {
908
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
909
                    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);
910
              }else{
911
                /* packet descrambling */
912
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
913
                if (newdata) {
914
                    int offset = 0;
915
                    while (offset < asf_st->pkt.size) {
916
                        int off = offset / asf_st->ds_chunk_size;
917
                        int row = off / asf_st->ds_span;
918
                        int col = off % asf_st->ds_span;
919
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
920
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
921

    
922
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
923
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
924
                        memcpy(newdata + offset,
925
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
926
                               asf_st->ds_chunk_size);
927
                        offset += asf_st->ds_chunk_size;
928
                    }
929
                    av_free(asf_st->pkt.data);
930
                    asf_st->pkt.data = newdata;
931
                }
932
              }
933
            }
934
            asf_st->frag_offset = 0;
935
            *pkt= asf_st->pkt;
936
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
937
            asf_st->pkt.size = 0;
938
            asf_st->pkt.data = 0;
939
            break; // packet completed
940
        }
941
    }
942
    return 0;
943
}
944

    
945
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
946
{
947
    ASFContext *asf = s->priv_data;
948

    
949
    for (;;) {
950
        int ret;
951

    
952
        /* parse cached packets, if any */
953
        if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
954
            return ret;
955
        if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
956
            assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
957
        asf->packet_time_start = 0;
958
    }
959

    
960
    return 0;
961
}
962

    
963
// Added to support seeking after packets have been read
964
// If information is not reset, read_packet fails due to
965
// leftover information from previous reads
966
static void asf_reset_header(AVFormatContext *s)
967
{
968
    ASFContext *asf = s->priv_data;
969
    ASFStream *asf_st;
970
    int i;
971

    
972
    asf->packet_nb_frames = 0;
973
    asf->packet_size_left = 0;
974
    asf->packet_segments = 0;
975
    asf->packet_flags = 0;
976
    asf->packet_property = 0;
977
    asf->packet_timestamp = 0;
978
    asf->packet_segsizetype = 0;
979
    asf->packet_segments = 0;
980
    asf->packet_seq = 0;
981
    asf->packet_replic_size = 0;
982
    asf->packet_key_frame = 0;
983
    asf->packet_padsize = 0;
984
    asf->packet_frag_offset = 0;
985
    asf->packet_frag_size = 0;
986
    asf->packet_frag_timestamp = 0;
987
    asf->packet_multi_size = 0;
988
    asf->packet_obj_size = 0;
989
    asf->packet_time_delta = 0;
990
    asf->packet_time_start = 0;
991

    
992
    for(i=0; i<s->nb_streams; i++){
993
        asf_st= s->streams[i]->priv_data;
994
        av_free_packet(&asf_st->pkt);
995
        asf_st->frag_offset=0;
996
        asf_st->seq=0;
997
    }
998
    asf->asf_st= NULL;
999
}
1000

    
1001
static int asf_read_close(AVFormatContext *s)
1002
{
1003
    int i;
1004

    
1005
    asf_reset_header(s);
1006
    for(i=0;i<s->nb_streams;i++) {
1007
        AVStream *st = s->streams[i];
1008
        av_free(st->codec->palctrl);
1009
    }
1010
    return 0;
1011
}
1012

    
1013
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1014
{
1015
    AVPacket pkt1, *pkt = &pkt1;
1016
    ASFStream *asf_st;
1017
    int64_t pts;
1018
    int64_t pos= *ppos;
1019
    int i;
1020
    int64_t start_pos[s->nb_streams];
1021

    
1022
    for(i=0; i<s->nb_streams; i++){
1023
        start_pos[i]= pos;
1024
    }
1025

    
1026
    if (s->packet_size > 0)
1027
        pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1028
    *ppos= pos;
1029
    url_fseek(s->pb, pos, SEEK_SET);
1030

    
1031
//printf("asf_read_pts\n");
1032
    asf_reset_header(s);
1033
    for(;;){
1034
        if (av_read_frame(s, pkt) < 0){
1035
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1036
            return AV_NOPTS_VALUE;
1037
        }
1038

    
1039
        pts= pkt->pts;
1040

    
1041
        av_free_packet(pkt);
1042
        if(pkt->flags&PKT_FLAG_KEY){
1043
            i= pkt->stream_index;
1044

    
1045
            asf_st= s->streams[i]->priv_data;
1046

    
1047
//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1048
            pos= asf_st->packet_pos;
1049

    
1050
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1051
            start_pos[i]= asf_st->packet_pos + 1;
1052

    
1053
            if(pkt->stream_index == stream_index)
1054
               break;
1055
        }
1056
    }
1057

    
1058
    *ppos= pos;
1059
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1060

    
1061
    return pts;
1062
}
1063

    
1064
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1065
{
1066
    ff_asf_guid g;
1067
    ASFContext *asf = s->priv_data;
1068
    int64_t current_pos= url_ftell(s->pb);
1069
    int i;
1070

    
1071
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1072
    get_guid(s->pb, &g);
1073
    if (!guidcmp(&g, &index_guid)) {
1074
        int64_t itime, last_pos=-1;
1075
        int pct, ict;
1076
        int64_t av_unused gsize= get_le64(s->pb);
1077
        get_guid(s->pb, &g);
1078
        itime=get_le64(s->pb);
1079
        pct=get_le32(s->pb);
1080
        ict=get_le32(s->pb);
1081
        av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1082

    
1083
        for (i=0;i<ict;i++){
1084
            int pktnum=get_le32(s->pb);
1085
            int pktct =get_le16(s->pb);
1086
            int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1087
            int64_t index_pts= av_rescale(itime, i, 10000);
1088

    
1089
            if(pos != last_pos){
1090
            av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1091
            av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1092
            last_pos=pos;
1093
            }
1094
        }
1095
        asf->index_read= 1;
1096
    }
1097
    url_fseek(s->pb, current_pos, SEEK_SET);
1098
}
1099

    
1100
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1101
{
1102
    ASFContext *asf = s->priv_data;
1103
    AVStream *st = s->streams[stream_index];
1104
    int64_t pos;
1105
    int index;
1106

    
1107
    if (s->packet_size <= 0)
1108
        return -1;
1109

    
1110
    /* Try using the protocol's read_seek if available */
1111
    if(s->pb) {
1112
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1113
        if(ret >= 0)
1114
            asf_reset_header(s);
1115
        if (ret != AVERROR(ENOSYS))
1116
            return ret;
1117
    }
1118

    
1119
    if (!asf->index_read)
1120
        asf_build_simple_index(s, stream_index);
1121

    
1122
    if(!(asf->index_read && st->index_entries)){
1123
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1124
            return -1;
1125
    }else{
1126
        index= av_index_search_timestamp(st, pts, flags);
1127
        if(index<0)
1128
            return -1;
1129

    
1130
        /* find the position */
1131
        pos = st->index_entries[index].pos;
1132

    
1133
    // various attempts to find key frame have failed so far
1134
    //    asf_reset_header(s);
1135
    //    url_fseek(s->pb, pos, SEEK_SET);
1136
    //    key_pos = pos;
1137
    //     for(i=0;i<16;i++){
1138
    //         pos = url_ftell(s->pb);
1139
    //         if (av_read_frame(s, &pkt) < 0){
1140
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1141
    //             return -1;
1142
    //         }
1143
    //         asf_st = s->streams[stream_index]->priv_data;
1144
    //         pos += st->parser->frame_offset;
1145
    //
1146
    //         if (pkt.size > b) {
1147
    //             b = pkt.size;
1148
    //             key_pos = pos;
1149
    //         }
1150
    //
1151
    //         av_free_packet(&pkt);
1152
    //     }
1153

    
1154
        /* do the seek */
1155
        av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1156
        url_fseek(s->pb, pos, SEEK_SET);
1157
    }
1158
    asf_reset_header(s);
1159
    return 0;
1160
}
1161

    
1162
AVInputFormat asf_demuxer = {
1163
    "asf",
1164
    NULL_IF_CONFIG_SMALL("ASF format"),
1165
    sizeof(ASFContext),
1166
    asf_probe,
1167
    asf_read_header,
1168
    asf_read_packet,
1169
    asf_read_close,
1170
    asf_read_seek,
1171
    asf_read_pts,
1172
    .metadata_conv = ff_asf_metadata_conv,
1173
};