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ffmpeg / libavformat / asfdec.c @ d970ec75

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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
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 * 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,
13
 * 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

    
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//#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
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#include <assert.h>
37

    
38
#define ASF_MAX_STREAMS 127
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#define FRAME_HEADER_SIZE 17
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// Fix Me! FRAME_HEADER_SIZE may be different.
41

    
42
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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};
45

    
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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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};
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/**********************************/
50
/* decoding */
51

    
52
static int guidcmp(const void *g1, const void *g2)
53
{
54
    return memcmp(g1, g2, sizeof(ff_asf_guid));
55
}
56

    
57
#ifdef DEBUG
58
#define PRINT_IF_GUID(g,cmp) \
59
if (!guidcmp(g, &cmp)) \
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    dprintf(NULL, "(GUID: %s) ", #cmp)
61

    
62
static void print_guid(const ff_asf_guid *g)
63
{
64
    int i;
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    PRINT_IF_GUID(g, ff_asf_header);
66
    else PRINT_IF_GUID(g, ff_asf_file_header);
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    else PRINT_IF_GUID(g, ff_asf_stream_header);
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    else PRINT_IF_GUID(g, ff_asf_audio_stream);
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    else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
70
    else PRINT_IF_GUID(g, ff_asf_video_stream);
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    else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
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    else PRINT_IF_GUID(g, ff_asf_command_stream);
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    else PRINT_IF_GUID(g, ff_asf_comment_header);
74
    else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
75
    else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
76
    else PRINT_IF_GUID(g, ff_asf_data_header);
77
    else PRINT_IF_GUID(g, index_guid);
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    else PRINT_IF_GUID(g, ff_asf_head1_guid);
79
    else PRINT_IF_GUID(g, ff_asf_head2_guid);
80
    else PRINT_IF_GUID(g, ff_asf_my_guid);
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    else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
82
    else PRINT_IF_GUID(g, ff_asf_extended_content_header);
83
    else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
84
    else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
85
    else PRINT_IF_GUID(g, ff_asf_metadata_header);
86
    else PRINT_IF_GUID(g, ff_asf_marker_header);
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    else PRINT_IF_GUID(g, stream_bitrate_guid);
88
    else PRINT_IF_GUID(g, ff_asf_language_guid);
89
    else
90
        dprintf(NULL, "(GUID: unknown) ");
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    for(i=0;i<16;i++)
92
        dprintf(NULL, " 0x%02x,", (*g)[i]);
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    dprintf(NULL, "}\n");
94
}
95
#undef PRINT_IF_GUID
96
#else
97
#define print_guid(g)
98
#endif
99

    
100
static void get_guid(ByteIOContext *s, ff_asf_guid *g)
101
{
102
    assert(sizeof(*g) == 16);
103
    get_buffer(s, *g, sizeof(*g));
104
}
105

    
106
#if 0
107
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
108
{
109
    int len, c;
110
    char *q;
111

112
    len = get_le16(pb);
113
    q = buf;
114
    while (len > 0) {
115
        c = get_le16(pb);
116
        if ((q - buf) < buf_size - 1)
117
            *q++ = c;
118
        len--;
119
    }
120
    *q = '\0';
121
}
122
#endif
123

    
124
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
125
{
126
    char* q = buf;
127
    while (len > 1) {
128
        uint8_t tmp;
129
        uint32_t ch;
130

    
131
        GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
132
        PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
133
    }
134
    if (len > 0)
135
        url_fskip(pb, len);
136
    *q = '\0';
137
}
138

    
139
static int asf_probe(AVProbeData *pd)
140
{
141
    /* check file header */
142
    if (!guidcmp(pd->buf, &ff_asf_header))
143
        return AVPROBE_SCORE_MAX;
144
    else
145
        return 0;
146
}
147

    
148
static int get_value(ByteIOContext *pb, int type){
149
    switch(type){
150
        case 2: return get_le32(pb);
151
        case 3: return get_le32(pb);
152
        case 4: return get_le64(pb);
153
        case 5: return get_le16(pb);
154
        default:return INT_MIN;
155
    }
156
}
157

    
158
static void get_tag(AVFormatContext *s, const char *key, int type, int len)
159
{
160
    char *value;
161

    
162
    if ((unsigned)len >= (UINT_MAX - 1)/2)
163
        return;
164

    
165
    value = av_malloc(2*len+1);
166
    if (!value)
167
        return;
168

    
169
    if (type == 0) {         // UTF16-LE
170
        get_str16_nolen(s->pb, len, value, 2*len + 1);
171
    } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
172
        uint64_t num = get_value(s->pb, type);
173
        snprintf(value, len, "%"PRIu64, num);
174
    } else {
175
        url_fskip(s->pb, len);
176
        av_freep(&value);
177
        av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
178
        return;
179
    }
180
    av_metadata_set2(&s->metadata, key, value, 0);
181
    av_freep(&value);
182
}
183

    
184
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
185
{
186
    ASFContext *asf = s->priv_data;
187
    ff_asf_guid g;
188
    ByteIOContext *pb = s->pb;
189
    AVStream *st;
190
    ASFStream *asf_st;
191
    int size, i;
192
    int64_t gsize;
193
    AVRational dar[128];
194
    uint32_t bitrate[128];
195

    
196
    memset(dar, 0, sizeof(dar));
197
    memset(bitrate, 0, sizeof(bitrate));
198

    
199
    get_guid(pb, &g);
200
    if (guidcmp(&g, &ff_asf_header))
201
        return -1;
202
    get_le64(pb);
203
    get_le32(pb);
204
    get_byte(pb);
205
    get_byte(pb);
206
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
207
    for(;;) {
208
        uint64_t gpos= url_ftell(pb);
209
        get_guid(pb, &g);
210
        gsize = get_le64(pb);
211
        dprintf(s, "%08"PRIx64": ", gpos);
212
        print_guid(&g);
213
        dprintf(s, "  size=0x%"PRIx64"\n", gsize);
214
        if (!guidcmp(&g, &ff_asf_data_header)) {
215
            asf->data_object_offset = url_ftell(pb);
216
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
217
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
218
                asf->data_object_size = gsize - 24;
219
            } else {
220
                asf->data_object_size = (uint64_t)-1;
221
            }
222
            break;
223
        }
224
        if (gsize < 24)
225
            return -1;
226
        if (!guidcmp(&g, &ff_asf_file_header)) {
227
            get_guid(pb, &asf->hdr.guid);
228
            asf->hdr.file_size          = get_le64(pb);
229
            asf->hdr.create_time        = get_le64(pb);
230
            asf->nb_packets             = get_le64(pb);
231
            asf->hdr.play_time          = get_le64(pb);
232
            asf->hdr.send_time          = get_le64(pb);
233
            asf->hdr.preroll            = get_le32(pb);
234
            asf->hdr.ignore             = get_le32(pb);
235
            asf->hdr.flags              = get_le32(pb);
236
            asf->hdr.min_pktsize        = get_le32(pb);
237
            asf->hdr.max_pktsize        = get_le32(pb);
238
            asf->hdr.max_bitrate        = get_le32(pb);
239
            s->packet_size = asf->hdr.max_pktsize;
240
        } else if (!guidcmp(&g, &ff_asf_stream_header)) {
241
            enum AVMediaType type;
242
            int type_specific_size, sizeX;
243
            uint64_t total_size;
244
            unsigned int tag1;
245
            int64_t pos1, pos2, start_time;
246
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
247

    
248
            if (s->nb_streams == ASF_MAX_STREAMS) {
249
                av_log(s, AV_LOG_ERROR, "too many streams\n");
250
                return AVERROR(EINVAL);
251
            }
252

    
253
            pos1 = url_ftell(pb);
254

    
255
            st = av_new_stream(s, 0);
256
            if (!st)
257
                return AVERROR(ENOMEM);
258
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
259
            asf_st = av_mallocz(sizeof(ASFStream));
260
            if (!asf_st)
261
                return AVERROR(ENOMEM);
262
            st->priv_data = asf_st;
263
            start_time = asf->hdr.preroll;
264

    
265
            asf_st->stream_language_index = 128; // invalid stream index means no language info
266

    
267
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
268
                st->duration = asf->hdr.play_time /
269
                    (10000000 / 1000) - start_time;
270
            }
271
            get_guid(pb, &g);
272

    
273
            test_for_ext_stream_audio = 0;
274
            if (!guidcmp(&g, &ff_asf_audio_stream)) {
275
                type = AVMEDIA_TYPE_AUDIO;
276
            } else if (!guidcmp(&g, &ff_asf_video_stream)) {
277
                type = AVMEDIA_TYPE_VIDEO;
278
            } else if (!guidcmp(&g, &ff_asf_jfif_media)) {
279
                type = AVMEDIA_TYPE_VIDEO;
280
                st->codec->codec_id = CODEC_ID_MJPEG;
281
            } else if (!guidcmp(&g, &ff_asf_command_stream)) {
282
                type = AVMEDIA_TYPE_DATA;
283
            } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
284
                test_for_ext_stream_audio = 1;
285
                type = AVMEDIA_TYPE_UNKNOWN;
286
            } else {
287
                return -1;
288
            }
289
            get_guid(pb, &g);
290
            total_size = get_le64(pb);
291
            type_specific_size = get_le32(pb);
292
            get_le32(pb);
293
            st->id = get_le16(pb) & 0x7f; /* stream id */
294
            // mapping of asf ID to AV stream ID;
295
            asf->asfid2avid[st->id] = s->nb_streams - 1;
296

    
297
            get_le32(pb);
298

    
299
            if (test_for_ext_stream_audio) {
300
                get_guid(pb, &g);
301
                if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
302
                    type = AVMEDIA_TYPE_AUDIO;
303
                    is_dvr_ms_audio=1;
304
                    get_guid(pb, &g);
305
                    get_le32(pb);
306
                    get_le32(pb);
307
                    get_le32(pb);
308
                    get_guid(pb, &g);
309
                    get_le32(pb);
310
                }
311
            }
312

    
313
            st->codec->codec_type = type;
314
            if (type == AVMEDIA_TYPE_AUDIO) {
315
                ff_get_wav_header(pb, st->codec, type_specific_size);
316
                if (is_dvr_ms_audio) {
317
                    // codec_id and codec_tag are unreliable in dvr_ms
318
                    // files. Set them later by probing stream.
319
                    st->codec->codec_id = CODEC_ID_PROBE;
320
                    st->codec->codec_tag = 0;
321
                }
322
                if (st->codec->codec_id == CODEC_ID_AAC) {
323
                    st->need_parsing = AVSTREAM_PARSE_NONE;
324
                } else {
325
                    st->need_parsing = AVSTREAM_PARSE_FULL;
326
                }
327
                /* We have to init the frame size at some point .... */
328
                pos2 = url_ftell(pb);
329
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
330
                    asf_st->ds_span = get_byte(pb);
331
                    asf_st->ds_packet_size = get_le16(pb);
332
                    asf_st->ds_chunk_size = get_le16(pb);
333
                    get_le16(pb); //ds_data_size
334
                    get_byte(pb); //ds_silence_data
335
                }
336
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
337
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
338
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
339
                if (asf_st->ds_span > 1) {
340
                    if (!asf_st->ds_chunk_size
341
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
342
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
343
                        asf_st->ds_span = 0; // disable descrambling
344
                }
345
                switch (st->codec->codec_id) {
346
                case CODEC_ID_MP3:
347
                    st->codec->frame_size = MPA_FRAME_SIZE;
348
                    break;
349
                case CODEC_ID_PCM_S16LE:
350
                case CODEC_ID_PCM_S16BE:
351
                case CODEC_ID_PCM_U16LE:
352
                case CODEC_ID_PCM_U16BE:
353
                case CODEC_ID_PCM_S8:
354
                case CODEC_ID_PCM_U8:
355
                case CODEC_ID_PCM_ALAW:
356
                case CODEC_ID_PCM_MULAW:
357
                    st->codec->frame_size = 1;
358
                    break;
359
                default:
360
                    /* This is probably wrong, but it prevents a crash later */
361
                    st->codec->frame_size = 1;
362
                    break;
363
                }
364
            } else if (type == AVMEDIA_TYPE_VIDEO &&
365
                       gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
366
                get_le32(pb);
367
                get_le32(pb);
368
                get_byte(pb);
369
                size = get_le16(pb); /* size */
370
                sizeX= get_le32(pb); /* size */
371
                st->codec->width = get_le32(pb);
372
                st->codec->height = get_le32(pb);
373
                /* not available for asf */
374
                get_le16(pb); /* panes */
375
                st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
376
                tag1 = get_le32(pb);
377
                url_fskip(pb, 20);
378
//                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
379
                size= sizeX;
380
                if (size > 40) {
381
                    st->codec->extradata_size = size - 40;
382
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
383
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
384
                }
385

    
386
                /* Extract palette from extradata if bpp <= 8 */
387
                /* This code assumes that extradata contains only palette */
388
                /* This is true for all paletted codecs implemented in ffmpeg */
389
                if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
390
                    st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
391
#if HAVE_BIGENDIAN
392
                    for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
393
                        st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
394
#else
395
                    memcpy(st->codec->palctrl->palette, st->codec->extradata,
396
                           FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
397
#endif
398
                    st->codec->palctrl->palette_changed = 1;
399
                }
400

    
401
                st->codec->codec_tag = tag1;
402
                st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
403
                if(tag1 == MKTAG('D', 'V', 'R', ' ')){
404
                    st->need_parsing = AVSTREAM_PARSE_FULL;
405
                    // 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
406
                    st->codec->width  =
407
                    st->codec->height = 0;
408
                    av_freep(&st->codec->extradata);
409
                    st->codec->extradata_size=0;
410
                }
411
                if(st->codec->codec_id == CODEC_ID_H264)
412
                    st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
413
            }
414
            pos2 = url_ftell(pb);
415
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
416
        } else if (!guidcmp(&g, &ff_asf_comment_header)) {
417
            int len1, len2, len3, len4, len5;
418

    
419
            len1 = get_le16(pb);
420
            len2 = get_le16(pb);
421
            len3 = get_le16(pb);
422
            len4 = get_le16(pb);
423
            len5 = get_le16(pb);
424
            get_tag(s, "title"    , 0, len1);
425
            get_tag(s, "author"   , 0, len2);
426
            get_tag(s, "copyright", 0, len3);
427
            get_tag(s, "comment"  , 0, len4);
428
            url_fskip(pb, len5);
429
        } else if (!guidcmp(&g, &stream_bitrate_guid)) {
430
            int stream_count = get_le16(pb);
431
            int j;
432

    
433
//            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
434
//            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
435
            for(j = 0; j < stream_count; j++) {
436
                int flags, bitrate, stream_id;
437

    
438
                flags= get_le16(pb);
439
                bitrate= get_le32(pb);
440
                stream_id= (flags & 0x7f);
441
//                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
442
                asf->stream_bitrates[stream_id]= bitrate;
443
            }
444
        } else if (!guidcmp(&g, &ff_asf_language_guid)) {
445
            int j;
446
            int stream_count = get_le16(pb);
447
            for(j = 0; j < stream_count; j++) {
448
                char lang[6];
449
                unsigned int lang_len = get_byte(pb);
450
                get_str16_nolen(pb, lang_len, lang, sizeof(lang));
451
                if (j < 128)
452
                    av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
453
            }
454
        } else if (!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
                    get_str16_nolen(pb, name_len, name, sizeof(name));
466
                    value_type = get_le16(pb);
467
                    value_len  = get_le16(pb);
468
                    if (!value_type && value_len%2)
469
                        value_len += 1;
470
                    get_tag(s, name, value_type, value_len);
471
            }
472
        } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
473
            int n, stream_num, name_len, value_len, value_type, value_num;
474
            n = get_le16(pb);
475

    
476
            for(i=0;i<n;i++) {
477
                char name[1024];
478

    
479
                get_le16(pb); //lang_list_index
480
                stream_num= get_le16(pb);
481
                name_len=   get_le16(pb);
482
                value_type= get_le16(pb);
483
                value_len=  get_le32(pb);
484

    
485
                get_str16_nolen(pb, name_len, name, sizeof(name));
486
//av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
487
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
488
                url_fskip(pb, value_len - 2);
489

    
490
                if(stream_num<128){
491
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
492
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
493
                }
494
            }
495
        } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
496
            int ext_len, payload_ext_ct, stream_ct;
497
            uint32_t ext_d, leak_rate, stream_num;
498
            unsigned int stream_languageid_index;
499

    
500
            get_le64(pb); // starttime
501
            get_le64(pb); // endtime
502
            leak_rate = get_le32(pb); // leak-datarate
503
            get_le32(pb); // bucket-datasize
504
            get_le32(pb); // init-bucket-fullness
505
            get_le32(pb); // alt-leak-datarate
506
            get_le32(pb); // alt-bucket-datasize
507
            get_le32(pb); // alt-init-bucket-fullness
508
            get_le32(pb); // max-object-size
509
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
510
            stream_num = get_le16(pb); // stream-num
511

    
512
            stream_languageid_index = get_le16(pb); // stream-language-id-index
513
            if (stream_num < 128)
514
                asf->streams[stream_num].stream_language_index = stream_languageid_index;
515

    
516
            get_le64(pb); // avg frametime in 100ns units
517
            stream_ct = get_le16(pb); //stream-name-count
518
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
519

    
520
            if (stream_num < 128)
521
                bitrate[stream_num] = leak_rate;
522

    
523
            for (i=0; i<stream_ct; i++){
524
                get_le16(pb);
525
                ext_len = get_le16(pb);
526
                url_fseek(pb, ext_len, SEEK_CUR);
527
            }
528

    
529
            for (i=0; i<payload_ext_ct; i++){
530
                get_guid(pb, &g);
531
                ext_d=get_le16(pb);
532
                ext_len=get_le32(pb);
533
                url_fseek(pb, ext_len, SEEK_CUR);
534
            }
535

    
536
            // there could be a optional stream properties object to follow
537
            // if so the next iteration will pick it up
538
            continue;
539
        } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
540
            int v1, v2;
541
            get_guid(pb, &g);
542
            v1 = get_le32(pb);
543
            v2 = get_le16(pb);
544
            continue;
545
        } else if (!guidcmp(&g, &ff_asf_marker_header)) {
546
            int i, count, name_len;
547
            char name[1024];
548

    
549
            get_le64(pb);            // reserved 16 bytes
550
            get_le64(pb);            // ...
551
            count = get_le32(pb);    // markers count
552
            get_le16(pb);            // reserved 2 bytes
553
            name_len = get_le16(pb); // name length
554
            for(i=0;i<name_len;i++){
555
                get_byte(pb); // skip the name
556
            }
557

    
558
            for(i=0;i<count;i++){
559
                int64_t pres_time;
560
                int name_len;
561

    
562
                get_le64(pb);             // offset, 8 bytes
563
                pres_time = get_le64(pb); // presentation time
564
                get_le16(pb);             // entry length
565
                get_le32(pb);             // send time
566
                get_le32(pb);             // flags
567
                name_len = get_le32(pb);  // name length
568
                get_str16_nolen(pb, name_len * 2, name, sizeof(name));
569
                ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
570
            }
571
#if 0
572
        } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
573
            int len, v1, n, num;
574
            char str[256], *q;
575
            char tag[16];
576

577
            get_guid(pb, &g);
578
            print_guid(&g);
579

580
            n = get_le32(pb);
581
            for(i=0;i<n;i++) {
582
                num = get_le16(pb); /* stream number */
583
                get_str16(pb, str, sizeof(str));
584
                get_str16(pb, str, sizeof(str));
585
                len = get_le16(pb);
586
                q = tag;
587
                while (len > 0) {
588
                    v1 = get_byte(pb);
589
                    if ((q - tag) < sizeof(tag) - 1)
590
                        *q++ = v1;
591
                    len--;
592
                }
593
                *q = '\0';
594
            }
595
#endif
596
        } else if (url_feof(pb)) {
597
            return -1;
598
        } else {
599
            if (!s->keylen) {
600
                if (!guidcmp(&g, &ff_asf_content_encryption)) {
601
                    av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
602
                } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
603
                    av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
604
                } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
605
                    av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
606
                }
607
            }
608
        }
609
        if(url_ftell(pb) != gpos + gsize)
610
            av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
611
        url_fseek(pb, gpos + gsize, SEEK_SET);
612
    }
613
    get_guid(pb, &g);
614
    get_le64(pb);
615
    get_byte(pb);
616
    get_byte(pb);
617
    if (url_feof(pb))
618
        return -1;
619
    asf->data_offset = url_ftell(pb);
620
    asf->packet_size_left = 0;
621

    
622

    
623
    for(i=0; i<128; i++){
624
        int stream_num= asf->asfid2avid[i];
625
        if(stream_num>=0){
626
            AVStream *st = s->streams[stream_num];
627
            if (!st->codec->bit_rate)
628
                st->codec->bit_rate = bitrate[i];
629
            if (dar[i].num > 0 && dar[i].den > 0)
630
                av_reduce(&st->sample_aspect_ratio.num,
631
                          &st->sample_aspect_ratio.den,
632
                          dar[i].num, dar[i].den, INT_MAX);
633
//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);
634

    
635
            // copy and convert language codes to the frontend
636
            if (asf->streams[i].stream_language_index < 128) {
637
                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
638
                if (rfc1766 && strlen(rfc1766) > 1) {
639
                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
640
                    const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
641
                    if (iso6392)
642
                        av_metadata_set2(&st->metadata, "language", iso6392, 0);
643
                }
644
            }
645
        }
646
    }
647

    
648
    return 0;
649
}
650

    
651
#define DO_2BITS(bits, var, defval) \
652
    switch (bits & 3) \
653
    { \
654
    case 3: var = get_le32(pb); rsize += 4; break; \
655
    case 2: var = get_le16(pb); rsize += 2; break; \
656
    case 1: var = get_byte(pb); rsize++; break; \
657
    default: var = defval; break; \
658
    }
659

    
660
/**
661
 * Load a single ASF packet into the demuxer.
662
 * @param s demux context
663
 * @param pb context to read data from
664
 * @return 0 on success, <0 on error
665
 */
666
static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
667
{
668
    ASFContext *asf = s->priv_data;
669
    uint32_t packet_length, padsize;
670
    int rsize = 8;
671
    int c, d, e, off;
672

    
673
    // if we do not know packet size, allow skipping up to 32 kB
674
    off= 32768;
675
    if (s->packet_size > 0)
676
        off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
677

    
678
    c=d=e=-1;
679
    while(off-- > 0){
680
        c=d; d=e;
681
        e= get_byte(pb);
682
        if(c == 0x82 && !d && !e)
683
            break;
684
    }
685

    
686
    if (c != 0x82) {
687
        /**
688
         * This code allows handling of -EAGAIN at packet boundaries (i.e.
689
         * if the packet sync code above triggers -EAGAIN). This does not
690
         * imply complete -EAGAIN handling support at random positions in
691
         * the stream.
692
         */
693
        if (url_ferror(pb) == AVERROR(EAGAIN))
694
            return AVERROR(EAGAIN);
695
        if (!url_feof(pb))
696
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
697
    }
698
    if ((c & 0x8f) == 0x82) {
699
        if (d || e) {
700
            if (!url_feof(pb))
701
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
702
            return -1;
703
        }
704
        c= get_byte(pb);
705
        d= get_byte(pb);
706
        rsize+=3;
707
    }else{
708
        url_fseek(pb, -1, SEEK_CUR); //FIXME
709
    }
710

    
711
    asf->packet_flags    = c;
712
    asf->packet_property = d;
713

    
714
    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
715
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
716
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
717

    
718
    //the following checks prevent overflows and infinite loops
719
    if(!packet_length || packet_length >= (1U<<29)){
720
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
721
        return -1;
722
    }
723
    if(padsize >= packet_length){
724
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
725
        return -1;
726
    }
727

    
728
    asf->packet_timestamp = get_le32(pb);
729
    get_le16(pb); /* duration */
730
    // rsize has at least 11 bytes which have to be present
731

    
732
    if (asf->packet_flags & 0x01) {
733
        asf->packet_segsizetype = get_byte(pb); rsize++;
734
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
735
    } else {
736
        asf->packet_segments = 1;
737
        asf->packet_segsizetype = 0x80;
738
    }
739
    asf->packet_size_left = packet_length - padsize - rsize;
740
    if (packet_length < asf->hdr.min_pktsize)
741
        padsize += asf->hdr.min_pktsize - packet_length;
742
    asf->packet_padsize = padsize;
743
    dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
744
    return 0;
745
}
746

    
747
/**
748
 *
749
 * @return <0 if error
750
 */
751
static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
752
    ASFContext *asf = s->priv_data;
753
    int rsize = 1;
754
    int num = get_byte(pb);
755
    int64_t ts0, ts1;
756

    
757
    asf->packet_segments--;
758
    asf->packet_key_frame = num >> 7;
759
    asf->stream_index = asf->asfid2avid[num & 0x7f];
760
    // sequence should be ignored!
761
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
762
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
763
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
764
//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);
765
    if (asf->packet_replic_size >= 8) {
766
        asf->packet_obj_size = get_le32(pb);
767
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
768
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
769
            return -1;
770
        }
771
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
772
        if(asf->packet_replic_size >= 8+38+4){
773
//            for(i=0; i<asf->packet_replic_size-8; i++)
774
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
775
//            av_log(s, AV_LOG_DEBUG, "\n");
776
            url_fskip(pb, 10);
777
            ts0= get_le64(pb);
778
            ts1= get_le64(pb);
779
            url_fskip(pb, 12);
780
            get_le32(pb);
781
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
782
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
783
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
784
        }else
785
            url_fskip(pb, asf->packet_replic_size - 8);
786
        rsize += asf->packet_replic_size; // FIXME - check validity
787
    } else if (asf->packet_replic_size==1){
788
        // multipacket - frag_offset is beginning timestamp
789
        asf->packet_time_start = asf->packet_frag_offset;
790
        asf->packet_frag_offset = 0;
791
        asf->packet_frag_timestamp = asf->packet_timestamp;
792

    
793
        asf->packet_time_delta = get_byte(pb);
794
        rsize++;
795
    }else if(asf->packet_replic_size!=0){
796
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
797
        return -1;
798
    }
799
    if (asf->packet_flags & 0x01) {
800
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
801
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
802
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
803
            return -1;
804
        }
805
        //printf("Fragsize %d\n", asf->packet_frag_size);
806
    } else {
807
        asf->packet_frag_size = asf->packet_size_left - rsize;
808
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
809
    }
810
    if (asf->packet_replic_size == 1) {
811
        asf->packet_multi_size = asf->packet_frag_size;
812
        if (asf->packet_multi_size > asf->packet_size_left)
813
            return -1;
814
    }
815
    asf->packet_size_left -= rsize;
816
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
817

    
818
    return 0;
819
}
820

    
821
/**
822
 * Parse data from individual ASF packets (which were previously loaded
823
 * with asf_get_packet()).
824
 * @param s demux context
825
 * @param pb context to read data from
826
 * @param pkt pointer to store packet data into
827
 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
828
 *          packets need to be loaded (through asf_get_packet())
829
 */
830
static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
831
{
832
    ASFContext *asf = s->priv_data;
833
    ASFStream *asf_st = 0;
834
    for (;;) {
835
        if(url_feof(pb))
836
            return AVERROR_EOF;
837
        if (asf->packet_size_left < FRAME_HEADER_SIZE
838
            || asf->packet_segments < 1) {
839
            //asf->packet_size_left <= asf->packet_padsize) {
840
            int ret = asf->packet_size_left + asf->packet_padsize;
841
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
842
            assert(ret>=0);
843
            /* fail safe */
844
            url_fskip(pb, ret);
845

    
846
            asf->packet_pos= url_ftell(pb);
847
            if (asf->data_object_size != (uint64_t)-1 &&
848
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
849
                return AVERROR_EOF; /* Do not exceed the size of the data object */
850
            return 1;
851
        }
852
        if (asf->packet_time_start == 0) {
853
            if(asf_read_frame_header(s, pb) < 0){
854
                asf->packet_segments= 0;
855
                continue;
856
            }
857
            if (asf->stream_index < 0
858
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
859
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
860
                ) {
861
                asf->packet_time_start = 0;
862
                /* unhandled packet (should not happen) */
863
                url_fskip(pb, asf->packet_frag_size);
864
                asf->packet_size_left -= asf->packet_frag_size;
865
                if(asf->stream_index < 0)
866
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
867
                continue;
868
            }
869
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
870
        }
871
        asf_st = asf->asf_st;
872

    
873
        if (asf->packet_replic_size == 1) {
874
            // frag_offset is here used as the beginning timestamp
875
            asf->packet_frag_timestamp = asf->packet_time_start;
876
            asf->packet_time_start += asf->packet_time_delta;
877
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
878
            asf->packet_size_left--;
879
            asf->packet_multi_size--;
880
            if (asf->packet_multi_size < asf->packet_obj_size)
881
            {
882
                asf->packet_time_start = 0;
883
                url_fskip(pb, asf->packet_multi_size);
884
                asf->packet_size_left -= asf->packet_multi_size;
885
                continue;
886
            }
887
            asf->packet_multi_size -= asf->packet_obj_size;
888
            //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);
889
        }
890
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
891
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
892
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
893
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
894
                asf_st->frag_offset, asf->packet_frag_size,
895
                asf->packet_obj_size, asf_st->pkt.size);
896
            asf->packet_obj_size= asf_st->pkt.size;
897
        }
898

    
899
        if (   asf_st->pkt.size != asf->packet_obj_size
900
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
901
            if(asf_st->pkt.data){
902
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
903
                asf_st->frag_offset = 0;
904
                av_free_packet(&asf_st->pkt);
905
            }
906
            /* new packet */
907
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
908
            asf_st->seq = asf->packet_seq;
909
            asf_st->pkt.dts = asf->packet_frag_timestamp;
910
            asf_st->pkt.stream_index = asf->stream_index;
911
            asf_st->pkt.pos =
912
            asf_st->packet_pos= asf->packet_pos;
913
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
914
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
915
//s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
916
            if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
917
                asf->packet_key_frame = 1;
918
            if (asf->packet_key_frame)
919
                asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
920
        }
921

    
922
        /* read data */
923
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
924
        //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
925
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
926
        asf->packet_size_left -= asf->packet_frag_size;
927
        if (asf->packet_size_left < 0)
928
            continue;
929

    
930
        if(   asf->packet_frag_offset >= asf_st->pkt.size
931
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
932
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
933
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
934
            continue;
935
        }
936

    
937
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
938
                   asf->packet_frag_size);
939
        if (s->key && s->keylen == 20)
940
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
941
                            asf->packet_frag_size);
942
        asf_st->frag_offset += asf->packet_frag_size;
943
        /* test if whole packet is read */
944
        if (asf_st->frag_offset == asf_st->pkt.size) {
945
            //workaround for macroshit radio DVR-MS files
946
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
947
               && asf_st->pkt.size > 100){
948
                int i;
949
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
950
                if(i == asf_st->pkt.size){
951
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
952
                    asf_st->frag_offset = 0;
953
                    av_free_packet(&asf_st->pkt);
954
                    continue;
955
                }
956
            }
957

    
958
            /* return packet */
959
            if (asf_st->ds_span > 1) {
960
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
961
                    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);
962
              }else{
963
                /* packet descrambling */
964
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
965
                if (newdata) {
966
                    int offset = 0;
967
                    while (offset < asf_st->pkt.size) {
968
                        int off = offset / asf_st->ds_chunk_size;
969
                        int row = off / asf_st->ds_span;
970
                        int col = off % asf_st->ds_span;
971
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
972
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
973

    
974
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
975
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
976
                        memcpy(newdata + offset,
977
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
978
                               asf_st->ds_chunk_size);
979
                        offset += asf_st->ds_chunk_size;
980
                    }
981
                    av_free(asf_st->pkt.data);
982
                    asf_st->pkt.data = newdata;
983
                }
984
              }
985
            }
986
            asf_st->frag_offset = 0;
987
            *pkt= asf_st->pkt;
988
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
989
            asf_st->pkt.size = 0;
990
            asf_st->pkt.data = 0;
991
            break; // packet completed
992
        }
993
    }
994
    return 0;
995
}
996

    
997
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
998
{
999
    ASFContext *asf = s->priv_data;
1000

    
1001
    for (;;) {
1002
        int ret;
1003

    
1004
        /* parse cached packets, if any */
1005
        if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1006
            return ret;
1007
        if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1008
            assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1009
        asf->packet_time_start = 0;
1010
    }
1011

    
1012
    return 0;
1013
}
1014

    
1015
// Added to support seeking after packets have been read
1016
// If information is not reset, read_packet fails due to
1017
// leftover information from previous reads
1018
static void asf_reset_header(AVFormatContext *s)
1019
{
1020
    ASFContext *asf = s->priv_data;
1021
    ASFStream *asf_st;
1022
    int i;
1023

    
1024
    asf->packet_nb_frames = 0;
1025
    asf->packet_size_left = 0;
1026
    asf->packet_segments = 0;
1027
    asf->packet_flags = 0;
1028
    asf->packet_property = 0;
1029
    asf->packet_timestamp = 0;
1030
    asf->packet_segsizetype = 0;
1031
    asf->packet_segments = 0;
1032
    asf->packet_seq = 0;
1033
    asf->packet_replic_size = 0;
1034
    asf->packet_key_frame = 0;
1035
    asf->packet_padsize = 0;
1036
    asf->packet_frag_offset = 0;
1037
    asf->packet_frag_size = 0;
1038
    asf->packet_frag_timestamp = 0;
1039
    asf->packet_multi_size = 0;
1040
    asf->packet_obj_size = 0;
1041
    asf->packet_time_delta = 0;
1042
    asf->packet_time_start = 0;
1043

    
1044
    for(i=0; i<s->nb_streams; i++){
1045
        asf_st= s->streams[i]->priv_data;
1046
        av_free_packet(&asf_st->pkt);
1047
        asf_st->frag_offset=0;
1048
        asf_st->seq=0;
1049
    }
1050
    asf->asf_st= NULL;
1051
}
1052

    
1053
static int asf_read_close(AVFormatContext *s)
1054
{
1055
    int i;
1056

    
1057
    asf_reset_header(s);
1058
    for(i=0;i<s->nb_streams;i++) {
1059
        AVStream *st = s->streams[i];
1060
        av_free(st->codec->palctrl);
1061
    }
1062
    return 0;
1063
}
1064

    
1065
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1066
{
1067
    AVPacket pkt1, *pkt = &pkt1;
1068
    ASFStream *asf_st;
1069
    int64_t pts;
1070
    int64_t pos= *ppos;
1071
    int i;
1072
    int64_t start_pos[ASF_MAX_STREAMS];
1073

    
1074
    for(i=0; i<s->nb_streams; i++){
1075
        start_pos[i]= pos;
1076
    }
1077

    
1078
    if (s->packet_size > 0)
1079
        pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1080
    *ppos= pos;
1081
    url_fseek(s->pb, pos, SEEK_SET);
1082

    
1083
//printf("asf_read_pts\n");
1084
    asf_reset_header(s);
1085
    for(;;){
1086
        if (av_read_frame(s, pkt) < 0){
1087
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1088
            return AV_NOPTS_VALUE;
1089
        }
1090

    
1091
        pts= pkt->pts;
1092

    
1093
        av_free_packet(pkt);
1094
        if(pkt->flags&AV_PKT_FLAG_KEY){
1095
            i= pkt->stream_index;
1096

    
1097
            asf_st= s->streams[i]->priv_data;
1098

    
1099
//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1100
            pos= asf_st->packet_pos;
1101

    
1102
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1103
            start_pos[i]= asf_st->packet_pos + 1;
1104

    
1105
            if(pkt->stream_index == stream_index)
1106
               break;
1107
        }
1108
    }
1109

    
1110
    *ppos= pos;
1111
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1112

    
1113
    return pts;
1114
}
1115

    
1116
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1117
{
1118
    ff_asf_guid g;
1119
    ASFContext *asf = s->priv_data;
1120
    int64_t current_pos= url_ftell(s->pb);
1121
    int i;
1122

    
1123
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1124
    get_guid(s->pb, &g);
1125
    if (!guidcmp(&g, &index_guid)) {
1126
        int64_t itime, last_pos=-1;
1127
        int pct, ict;
1128
        int64_t av_unused gsize= get_le64(s->pb);
1129
        get_guid(s->pb, &g);
1130
        itime=get_le64(s->pb);
1131
        pct=get_le32(s->pb);
1132
        ict=get_le32(s->pb);
1133
        av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1134

    
1135
        for (i=0;i<ict;i++){
1136
            int pktnum=get_le32(s->pb);
1137
            int pktct =get_le16(s->pb);
1138
            int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1139
            int64_t index_pts= av_rescale(itime, i, 10000);
1140

    
1141
            if(pos != last_pos){
1142
            av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1143
            av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1144
            last_pos=pos;
1145
            }
1146
        }
1147
        asf->index_read= 1;
1148
    }
1149
    url_fseek(s->pb, current_pos, SEEK_SET);
1150
}
1151

    
1152
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1153
{
1154
    ASFContext *asf = s->priv_data;
1155
    AVStream *st = s->streams[stream_index];
1156
    int64_t pos;
1157
    int index;
1158

    
1159
    if (s->packet_size <= 0)
1160
        return -1;
1161

    
1162
    /* Try using the protocol's read_seek if available */
1163
    if(s->pb) {
1164
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1165
        if(ret >= 0)
1166
            asf_reset_header(s);
1167
        if (ret != AVERROR(ENOSYS))
1168
            return ret;
1169
    }
1170

    
1171
    if (!asf->index_read)
1172
        asf_build_simple_index(s, stream_index);
1173

    
1174
    if(!(asf->index_read && st->index_entries)){
1175
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1176
            return -1;
1177
    }else{
1178
        index= av_index_search_timestamp(st, pts, flags);
1179
        if(index<0)
1180
            return -1;
1181

    
1182
        /* find the position */
1183
        pos = st->index_entries[index].pos;
1184

    
1185
    // various attempts to find key frame have failed so far
1186
    //    asf_reset_header(s);
1187
    //    url_fseek(s->pb, pos, SEEK_SET);
1188
    //    key_pos = pos;
1189
    //     for(i=0;i<16;i++){
1190
    //         pos = url_ftell(s->pb);
1191
    //         if (av_read_frame(s, &pkt) < 0){
1192
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1193
    //             return -1;
1194
    //         }
1195
    //         asf_st = s->streams[stream_index]->priv_data;
1196
    //         pos += st->parser->frame_offset;
1197
    //
1198
    //         if (pkt.size > b) {
1199
    //             b = pkt.size;
1200
    //             key_pos = pos;
1201
    //         }
1202
    //
1203
    //         av_free_packet(&pkt);
1204
    //     }
1205

    
1206
        /* do the seek */
1207
        av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1208
        url_fseek(s->pb, pos, SEEK_SET);
1209
    }
1210
    asf_reset_header(s);
1211
    return 0;
1212
}
1213

    
1214
AVInputFormat asf_demuxer = {
1215
    "asf",
1216
    NULL_IF_CONFIG_SMALL("ASF format"),
1217
    sizeof(ASFContext),
1218
    asf_probe,
1219
    asf_read_header,
1220
    asf_read_packet,
1221
    asf_read_close,
1222
    asf_read_seek,
1223
    asf_read_pts,
1224
    .metadata_conv = ff_asf_metadata_conv,
1225
};