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ffmpeg / libavformat / asfdec.c @ b9f9e59a

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1
/*
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 * 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,
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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
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 * 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
36
#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
48
};
49
/**********************************/
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);
68
    else PRINT_IF_GUID(g, ff_asf_audio_stream);
69
    else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
70
    else PRINT_IF_GUID(g, ff_asf_video_stream);
71
    else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
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    else PRINT_IF_GUID(g, ff_asf_command_stream);
73
    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);
78
    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);
81
    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);
87
    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) ");
91
    for(i=0;i<16;i++)
92
        dprintf(NULL, " 0x%02x,", (*g)[i]);
93
    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
                    /**
471
                     * My sample has that stream set to 0 maybe that mean the container.
472
                     * Asf stream count start at 1. I am using 0 to the container value since it's unused
473
                     */
474
                    if (!strcmp(name, "AspectRatioX")){
475
                        dar[0].num= get_value(s->pb, value_type);
476
                    } else if(!strcmp(name, "AspectRatioY")){
477
                        dar[0].den= get_value(s->pb, value_type);
478
                    } else
479
                        get_tag(s, name, value_type, value_len);
480
            }
481
        } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
482
            int n, stream_num, name_len, value_len, value_type, value_num;
483
            n = get_le16(pb);
484

    
485
            for(i=0;i<n;i++) {
486
                char name[1024];
487

    
488
                get_le16(pb); //lang_list_index
489
                stream_num= get_le16(pb);
490
                name_len=   get_le16(pb);
491
                value_type= get_le16(pb);
492
                value_len=  get_le32(pb);
493

    
494
                get_str16_nolen(pb, name_len, name, sizeof(name));
495
//av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
496
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
497
                url_fskip(pb, value_len - 2);
498

    
499
                if(stream_num<128){
500
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
501
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
502
                }
503
            }
504
        } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
505
            int ext_len, payload_ext_ct, stream_ct;
506
            uint32_t ext_d, leak_rate, stream_num;
507
            unsigned int stream_languageid_index;
508

    
509
            get_le64(pb); // starttime
510
            get_le64(pb); // endtime
511
            leak_rate = get_le32(pb); // leak-datarate
512
            get_le32(pb); // bucket-datasize
513
            get_le32(pb); // init-bucket-fullness
514
            get_le32(pb); // alt-leak-datarate
515
            get_le32(pb); // alt-bucket-datasize
516
            get_le32(pb); // alt-init-bucket-fullness
517
            get_le32(pb); // max-object-size
518
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
519
            stream_num = get_le16(pb); // stream-num
520

    
521
            stream_languageid_index = get_le16(pb); // stream-language-id-index
522
            if (stream_num < 128)
523
                asf->streams[stream_num].stream_language_index = stream_languageid_index;
524

    
525
            get_le64(pb); // avg frametime in 100ns units
526
            stream_ct = get_le16(pb); //stream-name-count
527
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
528

    
529
            if (stream_num < 128)
530
                bitrate[stream_num] = leak_rate;
531

    
532
            for (i=0; i<stream_ct; i++){
533
                get_le16(pb);
534
                ext_len = get_le16(pb);
535
                url_fseek(pb, ext_len, SEEK_CUR);
536
            }
537

    
538
            for (i=0; i<payload_ext_ct; i++){
539
                get_guid(pb, &g);
540
                ext_d=get_le16(pb);
541
                ext_len=get_le32(pb);
542
                url_fseek(pb, ext_len, SEEK_CUR);
543
            }
544

    
545
            // there could be a optional stream properties object to follow
546
            // if so the next iteration will pick it up
547
            continue;
548
        } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
549
            int v1, v2;
550
            get_guid(pb, &g);
551
            v1 = get_le32(pb);
552
            v2 = get_le16(pb);
553
            continue;
554
        } else if (!guidcmp(&g, &ff_asf_marker_header)) {
555
            int i, count, name_len;
556
            char name[1024];
557

    
558
            get_le64(pb);            // reserved 16 bytes
559
            get_le64(pb);            // ...
560
            count = get_le32(pb);    // markers count
561
            get_le16(pb);            // reserved 2 bytes
562
            name_len = get_le16(pb); // name length
563
            for(i=0;i<name_len;i++){
564
                get_byte(pb); // skip the name
565
            }
566

    
567
            for(i=0;i<count;i++){
568
                int64_t pres_time;
569
                int name_len;
570

    
571
                get_le64(pb);             // offset, 8 bytes
572
                pres_time = get_le64(pb); // presentation time
573
                get_le16(pb);             // entry length
574
                get_le32(pb);             // send time
575
                get_le32(pb);             // flags
576
                name_len = get_le32(pb);  // name length
577
                get_str16_nolen(pb, name_len * 2, name, sizeof(name));
578
                ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
579
            }
580
#if 0
581
        } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
582
            int len, v1, n, num;
583
            char str[256], *q;
584
            char tag[16];
585

586
            get_guid(pb, &g);
587
            print_guid(&g);
588

589
            n = get_le32(pb);
590
            for(i=0;i<n;i++) {
591
                num = get_le16(pb); /* stream number */
592
                get_str16(pb, str, sizeof(str));
593
                get_str16(pb, str, sizeof(str));
594
                len = get_le16(pb);
595
                q = tag;
596
                while (len > 0) {
597
                    v1 = get_byte(pb);
598
                    if ((q - tag) < sizeof(tag) - 1)
599
                        *q++ = v1;
600
                    len--;
601
                }
602
                *q = '\0';
603
            }
604
#endif
605
        } else if (url_feof(pb)) {
606
            return -1;
607
        } else {
608
            if (!s->keylen) {
609
                if (!guidcmp(&g, &ff_asf_content_encryption)) {
610
                    av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
611
                } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
612
                    av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
613
                } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
614
                    av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
615
                }
616
            }
617
        }
618
        if(url_ftell(pb) != gpos + gsize)
619
            av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
620
        url_fseek(pb, gpos + gsize, SEEK_SET);
621
    }
622
    get_guid(pb, &g);
623
    get_le64(pb);
624
    get_byte(pb);
625
    get_byte(pb);
626
    if (url_feof(pb))
627
        return -1;
628
    asf->data_offset = url_ftell(pb);
629
    asf->packet_size_left = 0;
630

    
631

    
632
    for(i=0; i<128; i++){
633
        int stream_num= asf->asfid2avid[i];
634
        if(stream_num>=0){
635
            AVStream *st = s->streams[stream_num];
636
            if (!st->codec->bit_rate)
637
                st->codec->bit_rate = bitrate[i];
638
            if (dar[i].num > 0 && dar[i].den > 0){
639
                av_reduce(&st->sample_aspect_ratio.num,
640
                          &st->sample_aspect_ratio.den,
641
                          dar[i].num, dar[i].den, INT_MAX);
642
            } else if ((dar[0].num > 0) && (dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
643
                av_reduce(&st->sample_aspect_ratio.num,
644
                          &st->sample_aspect_ratio.den,
645
                          dar[0].num, dar[0].den, INT_MAX);
646

    
647
//av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
648

    
649
            // copy and convert language codes to the frontend
650
            if (asf->streams[i].stream_language_index < 128) {
651
                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
652
                if (rfc1766 && strlen(rfc1766) > 1) {
653
                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
654
                    const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
655
                    if (iso6392)
656
                        av_metadata_set2(&st->metadata, "language", iso6392, 0);
657
                }
658
            }
659
        }
660
    }
661

    
662
    return 0;
663
}
664

    
665
#define DO_2BITS(bits, var, defval) \
666
    switch (bits & 3) \
667
    { \
668
    case 3: var = get_le32(pb); rsize += 4; break; \
669
    case 2: var = get_le16(pb); rsize += 2; break; \
670
    case 1: var = get_byte(pb); rsize++; break; \
671
    default: var = defval; break; \
672
    }
673

    
674
/**
675
 * Load a single ASF packet into the demuxer.
676
 * @param s demux context
677
 * @param pb context to read data from
678
 * @return 0 on success, <0 on error
679
 */
680
static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
681
{
682
    ASFContext *asf = s->priv_data;
683
    uint32_t packet_length, padsize;
684
    int rsize = 8;
685
    int c, d, e, off;
686

    
687
    // if we do not know packet size, allow skipping up to 32 kB
688
    off= 32768;
689
    if (s->packet_size > 0)
690
        off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
691

    
692
    c=d=e=-1;
693
    while(off-- > 0){
694
        c=d; d=e;
695
        e= get_byte(pb);
696
        if(c == 0x82 && !d && !e)
697
            break;
698
    }
699

    
700
    if (c != 0x82) {
701
        /**
702
         * This code allows handling of -EAGAIN at packet boundaries (i.e.
703
         * if the packet sync code above triggers -EAGAIN). This does not
704
         * imply complete -EAGAIN handling support at random positions in
705
         * the stream.
706
         */
707
        if (url_ferror(pb) == AVERROR(EAGAIN))
708
            return AVERROR(EAGAIN);
709
        if (!url_feof(pb))
710
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
711
    }
712
    if ((c & 0x8f) == 0x82) {
713
        if (d || e) {
714
            if (!url_feof(pb))
715
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
716
            return -1;
717
        }
718
        c= get_byte(pb);
719
        d= get_byte(pb);
720
        rsize+=3;
721
    }else{
722
        url_fseek(pb, -1, SEEK_CUR); //FIXME
723
    }
724

    
725
    asf->packet_flags    = c;
726
    asf->packet_property = d;
727

    
728
    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
729
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
730
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
731

    
732
    //the following checks prevent overflows and infinite loops
733
    if(!packet_length || packet_length >= (1U<<29)){
734
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
735
        return -1;
736
    }
737
    if(padsize >= packet_length){
738
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
739
        return -1;
740
    }
741

    
742
    asf->packet_timestamp = get_le32(pb);
743
    get_le16(pb); /* duration */
744
    // rsize has at least 11 bytes which have to be present
745

    
746
    if (asf->packet_flags & 0x01) {
747
        asf->packet_segsizetype = get_byte(pb); rsize++;
748
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
749
    } else {
750
        asf->packet_segments = 1;
751
        asf->packet_segsizetype = 0x80;
752
    }
753
    asf->packet_size_left = packet_length - padsize - rsize;
754
    if (packet_length < asf->hdr.min_pktsize)
755
        padsize += asf->hdr.min_pktsize - packet_length;
756
    asf->packet_padsize = padsize;
757
    dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
758
    return 0;
759
}
760

    
761
/**
762
 *
763
 * @return <0 if error
764
 */
765
static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
766
    ASFContext *asf = s->priv_data;
767
    int rsize = 1;
768
    int num = get_byte(pb);
769
    int64_t ts0, ts1;
770

    
771
    asf->packet_segments--;
772
    asf->packet_key_frame = num >> 7;
773
    asf->stream_index = asf->asfid2avid[num & 0x7f];
774
    // sequence should be ignored!
775
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
776
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
777
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
778
//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);
779
    if (asf->packet_replic_size >= 8) {
780
        asf->packet_obj_size = get_le32(pb);
781
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
782
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
783
            return -1;
784
        }
785
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
786
        if(asf->packet_replic_size >= 8+38+4){
787
//            for(i=0; i<asf->packet_replic_size-8; i++)
788
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
789
//            av_log(s, AV_LOG_DEBUG, "\n");
790
            url_fskip(pb, 10);
791
            ts0= get_le64(pb);
792
            ts1= get_le64(pb);
793
            url_fskip(pb, 12);
794
            get_le32(pb);
795
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
796
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
797
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
798
        }else
799
            url_fskip(pb, asf->packet_replic_size - 8);
800
        rsize += asf->packet_replic_size; // FIXME - check validity
801
    } else if (asf->packet_replic_size==1){
802
        // multipacket - frag_offset is beginning timestamp
803
        asf->packet_time_start = asf->packet_frag_offset;
804
        asf->packet_frag_offset = 0;
805
        asf->packet_frag_timestamp = asf->packet_timestamp;
806

    
807
        asf->packet_time_delta = get_byte(pb);
808
        rsize++;
809
    }else if(asf->packet_replic_size!=0){
810
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
811
        return -1;
812
    }
813
    if (asf->packet_flags & 0x01) {
814
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
815
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
816
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
817
            return -1;
818
        }
819
        //printf("Fragsize %d\n", asf->packet_frag_size);
820
    } else {
821
        asf->packet_frag_size = asf->packet_size_left - rsize;
822
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
823
    }
824
    if (asf->packet_replic_size == 1) {
825
        asf->packet_multi_size = asf->packet_frag_size;
826
        if (asf->packet_multi_size > asf->packet_size_left)
827
            return -1;
828
    }
829
    asf->packet_size_left -= rsize;
830
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
831

    
832
    return 0;
833
}
834

    
835
/**
836
 * Parse data from individual ASF packets (which were previously loaded
837
 * with asf_get_packet()).
838
 * @param s demux context
839
 * @param pb context to read data from
840
 * @param pkt pointer to store packet data into
841
 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
842
 *          packets need to be loaded (through asf_get_packet())
843
 */
844
static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
845
{
846
    ASFContext *asf = s->priv_data;
847
    ASFStream *asf_st = 0;
848
    for (;;) {
849
        if(url_feof(pb))
850
            return AVERROR_EOF;
851
        if (asf->packet_size_left < FRAME_HEADER_SIZE
852
            || asf->packet_segments < 1) {
853
            //asf->packet_size_left <= asf->packet_padsize) {
854
            int ret = asf->packet_size_left + asf->packet_padsize;
855
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
856
            assert(ret>=0);
857
            /* fail safe */
858
            url_fskip(pb, ret);
859

    
860
            asf->packet_pos= url_ftell(pb);
861
            if (asf->data_object_size != (uint64_t)-1 &&
862
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
863
                return AVERROR_EOF; /* Do not exceed the size of the data object */
864
            return 1;
865
        }
866
        if (asf->packet_time_start == 0) {
867
            if(asf_read_frame_header(s, pb) < 0){
868
                asf->packet_segments= 0;
869
                continue;
870
            }
871
            if (asf->stream_index < 0
872
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
873
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
874
                ) {
875
                asf->packet_time_start = 0;
876
                /* unhandled packet (should not happen) */
877
                url_fskip(pb, asf->packet_frag_size);
878
                asf->packet_size_left -= asf->packet_frag_size;
879
                if(asf->stream_index < 0)
880
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
881
                continue;
882
            }
883
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
884
        }
885
        asf_st = asf->asf_st;
886

    
887
        if (asf->packet_replic_size == 1) {
888
            // frag_offset is here used as the beginning timestamp
889
            asf->packet_frag_timestamp = asf->packet_time_start;
890
            asf->packet_time_start += asf->packet_time_delta;
891
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
892
            asf->packet_size_left--;
893
            asf->packet_multi_size--;
894
            if (asf->packet_multi_size < asf->packet_obj_size)
895
            {
896
                asf->packet_time_start = 0;
897
                url_fskip(pb, asf->packet_multi_size);
898
                asf->packet_size_left -= asf->packet_multi_size;
899
                continue;
900
            }
901
            asf->packet_multi_size -= asf->packet_obj_size;
902
            //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);
903
        }
904
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
905
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
906
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
907
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
908
                asf_st->frag_offset, asf->packet_frag_size,
909
                asf->packet_obj_size, asf_st->pkt.size);
910
            asf->packet_obj_size= asf_st->pkt.size;
911
        }
912

    
913
        if (   asf_st->pkt.size != asf->packet_obj_size
914
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
915
            if(asf_st->pkt.data){
916
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
917
                asf_st->frag_offset = 0;
918
                av_free_packet(&asf_st->pkt);
919
            }
920
            /* new packet */
921
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
922
            asf_st->seq = asf->packet_seq;
923
            asf_st->pkt.dts = asf->packet_frag_timestamp;
924
            asf_st->pkt.stream_index = asf->stream_index;
925
            asf_st->pkt.pos =
926
            asf_st->packet_pos= asf->packet_pos;
927
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
928
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
929
//s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
930
            if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
931
                asf->packet_key_frame = 1;
932
            if (asf->packet_key_frame)
933
                asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
934
        }
935

    
936
        /* read data */
937
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
938
        //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
939
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
940
        asf->packet_size_left -= asf->packet_frag_size;
941
        if (asf->packet_size_left < 0)
942
            continue;
943

    
944
        if(   asf->packet_frag_offset >= asf_st->pkt.size
945
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
946
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
947
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
948
            continue;
949
        }
950

    
951
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
952
                   asf->packet_frag_size);
953
        if (s->key && s->keylen == 20)
954
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
955
                            asf->packet_frag_size);
956
        asf_st->frag_offset += asf->packet_frag_size;
957
        /* test if whole packet is read */
958
        if (asf_st->frag_offset == asf_st->pkt.size) {
959
            //workaround for macroshit radio DVR-MS files
960
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
961
               && asf_st->pkt.size > 100){
962
                int i;
963
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
964
                if(i == asf_st->pkt.size){
965
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
966
                    asf_st->frag_offset = 0;
967
                    av_free_packet(&asf_st->pkt);
968
                    continue;
969
                }
970
            }
971

    
972
            /* return packet */
973
            if (asf_st->ds_span > 1) {
974
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
975
                    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);
976
              }else{
977
                /* packet descrambling */
978
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
979
                if (newdata) {
980
                    int offset = 0;
981
                    while (offset < asf_st->pkt.size) {
982
                        int off = offset / asf_st->ds_chunk_size;
983
                        int row = off / asf_st->ds_span;
984
                        int col = off % asf_st->ds_span;
985
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
986
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
987

    
988
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
989
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
990
                        memcpy(newdata + offset,
991
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
992
                               asf_st->ds_chunk_size);
993
                        offset += asf_st->ds_chunk_size;
994
                    }
995
                    av_free(asf_st->pkt.data);
996
                    asf_st->pkt.data = newdata;
997
                }
998
              }
999
            }
1000
            asf_st->frag_offset = 0;
1001
            *pkt= asf_st->pkt;
1002
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
1003
            asf_st->pkt.size = 0;
1004
            asf_st->pkt.data = 0;
1005
            break; // packet completed
1006
        }
1007
    }
1008
    return 0;
1009
}
1010

    
1011
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
1012
{
1013
    ASFContext *asf = s->priv_data;
1014

    
1015
    for (;;) {
1016
        int ret;
1017

    
1018
        /* parse cached packets, if any */
1019
        if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
1020
            return ret;
1021
        if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
1022
            assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
1023
        asf->packet_time_start = 0;
1024
    }
1025

    
1026
    return 0;
1027
}
1028

    
1029
// Added to support seeking after packets have been read
1030
// If information is not reset, read_packet fails due to
1031
// leftover information from previous reads
1032
static void asf_reset_header(AVFormatContext *s)
1033
{
1034
    ASFContext *asf = s->priv_data;
1035
    ASFStream *asf_st;
1036
    int i;
1037

    
1038
    asf->packet_nb_frames = 0;
1039
    asf->packet_size_left = 0;
1040
    asf->packet_segments = 0;
1041
    asf->packet_flags = 0;
1042
    asf->packet_property = 0;
1043
    asf->packet_timestamp = 0;
1044
    asf->packet_segsizetype = 0;
1045
    asf->packet_segments = 0;
1046
    asf->packet_seq = 0;
1047
    asf->packet_replic_size = 0;
1048
    asf->packet_key_frame = 0;
1049
    asf->packet_padsize = 0;
1050
    asf->packet_frag_offset = 0;
1051
    asf->packet_frag_size = 0;
1052
    asf->packet_frag_timestamp = 0;
1053
    asf->packet_multi_size = 0;
1054
    asf->packet_obj_size = 0;
1055
    asf->packet_time_delta = 0;
1056
    asf->packet_time_start = 0;
1057

    
1058
    for(i=0; i<s->nb_streams; i++){
1059
        asf_st= s->streams[i]->priv_data;
1060
        av_free_packet(&asf_st->pkt);
1061
        asf_st->frag_offset=0;
1062
        asf_st->seq=0;
1063
    }
1064
    asf->asf_st= NULL;
1065
}
1066

    
1067
static int asf_read_close(AVFormatContext *s)
1068
{
1069
    int i;
1070

    
1071
    asf_reset_header(s);
1072
    for(i=0;i<s->nb_streams;i++) {
1073
        AVStream *st = s->streams[i];
1074
        av_free(st->codec->palctrl);
1075
    }
1076
    return 0;
1077
}
1078

    
1079
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1080
{
1081
    AVPacket pkt1, *pkt = &pkt1;
1082
    ASFStream *asf_st;
1083
    int64_t pts;
1084
    int64_t pos= *ppos;
1085
    int i;
1086
    int64_t start_pos[ASF_MAX_STREAMS];
1087

    
1088
    for(i=0; i<s->nb_streams; i++){
1089
        start_pos[i]= pos;
1090
    }
1091

    
1092
    if (s->packet_size > 0)
1093
        pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1094
    *ppos= pos;
1095
    url_fseek(s->pb, pos, SEEK_SET);
1096

    
1097
//printf("asf_read_pts\n");
1098
    asf_reset_header(s);
1099
    for(;;){
1100
        if (av_read_frame(s, pkt) < 0){
1101
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1102
            return AV_NOPTS_VALUE;
1103
        }
1104

    
1105
        pts= pkt->pts;
1106

    
1107
        av_free_packet(pkt);
1108
        if(pkt->flags&AV_PKT_FLAG_KEY){
1109
            i= pkt->stream_index;
1110

    
1111
            asf_st= s->streams[i]->priv_data;
1112

    
1113
//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1114
            pos= asf_st->packet_pos;
1115

    
1116
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1117
            start_pos[i]= asf_st->packet_pos + 1;
1118

    
1119
            if(pkt->stream_index == stream_index)
1120
               break;
1121
        }
1122
    }
1123

    
1124
    *ppos= pos;
1125
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1126

    
1127
    return pts;
1128
}
1129

    
1130
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1131
{
1132
    ff_asf_guid g;
1133
    ASFContext *asf = s->priv_data;
1134
    int64_t current_pos= url_ftell(s->pb);
1135
    int i;
1136

    
1137
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1138
    get_guid(s->pb, &g);
1139
    if (!guidcmp(&g, &index_guid)) {
1140
        int64_t itime, last_pos=-1;
1141
        int pct, ict;
1142
        int64_t av_unused gsize= get_le64(s->pb);
1143
        get_guid(s->pb, &g);
1144
        itime=get_le64(s->pb);
1145
        pct=get_le32(s->pb);
1146
        ict=get_le32(s->pb);
1147
        av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1148

    
1149
        for (i=0;i<ict;i++){
1150
            int pktnum=get_le32(s->pb);
1151
            int pktct =get_le16(s->pb);
1152
            int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1153
            int64_t index_pts= av_rescale(itime, i, 10000);
1154

    
1155
            if(pos != last_pos){
1156
            av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1157
            av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1158
            last_pos=pos;
1159
            }
1160
        }
1161
        asf->index_read= 1;
1162
    }
1163
    url_fseek(s->pb, current_pos, SEEK_SET);
1164
}
1165

    
1166
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1167
{
1168
    ASFContext *asf = s->priv_data;
1169
    AVStream *st = s->streams[stream_index];
1170
    int64_t pos;
1171
    int index;
1172

    
1173
    if (s->packet_size <= 0)
1174
        return -1;
1175

    
1176
    /* Try using the protocol's read_seek if available */
1177
    if(s->pb) {
1178
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1179
        if(ret >= 0)
1180
            asf_reset_header(s);
1181
        if (ret != AVERROR(ENOSYS))
1182
            return ret;
1183
    }
1184

    
1185
    if (!asf->index_read)
1186
        asf_build_simple_index(s, stream_index);
1187

    
1188
    if(!(asf->index_read && st->index_entries)){
1189
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1190
            return -1;
1191
    }else{
1192
        index= av_index_search_timestamp(st, pts, flags);
1193
        if(index<0)
1194
            return -1;
1195

    
1196
        /* find the position */
1197
        pos = st->index_entries[index].pos;
1198

    
1199
    // various attempts to find key frame have failed so far
1200
    //    asf_reset_header(s);
1201
    //    url_fseek(s->pb, pos, SEEK_SET);
1202
    //    key_pos = pos;
1203
    //     for(i=0;i<16;i++){
1204
    //         pos = url_ftell(s->pb);
1205
    //         if (av_read_frame(s, &pkt) < 0){
1206
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1207
    //             return -1;
1208
    //         }
1209
    //         asf_st = s->streams[stream_index]->priv_data;
1210
    //         pos += st->parser->frame_offset;
1211
    //
1212
    //         if (pkt.size > b) {
1213
    //             b = pkt.size;
1214
    //             key_pos = pos;
1215
    //         }
1216
    //
1217
    //         av_free_packet(&pkt);
1218
    //     }
1219

    
1220
        /* do the seek */
1221
        av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1222
        url_fseek(s->pb, pos, SEEK_SET);
1223
    }
1224
    asf_reset_header(s);
1225
    return 0;
1226
}
1227

    
1228
AVInputFormat asf_demuxer = {
1229
    "asf",
1230
    NULL_IF_CONFIG_SMALL("ASF format"),
1231
    sizeof(ASFContext),
1232
    asf_probe,
1233
    asf_read_header,
1234
    asf_read_packet,
1235
    asf_read_close,
1236
    asf_read_seek,
1237
    asf_read_pts,
1238
    .metadata_conv = ff_asf_metadata_conv,
1239
};