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ffmpeg / libavformat / asfdec.c @ e4ea625a

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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,
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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
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#include <assert.h>
37

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

    
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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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};
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static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
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    0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
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};
48
/**********************************/
49
/* decoding */
50

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

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

    
61
static void print_guid(const ff_asf_guid *g)
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{
63
    int i;
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    PRINT_IF_GUID(g, ff_asf_header);
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    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);
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    else PRINT_IF_GUID(g, ff_asf_video_stream);
70
    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);
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    else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
74
    else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
75
    else PRINT_IF_GUID(g, ff_asf_data_header);
76
    else PRINT_IF_GUID(g, index_guid);
77
    else PRINT_IF_GUID(g, ff_asf_head1_guid);
78
    else PRINT_IF_GUID(g, ff_asf_head2_guid);
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    else PRINT_IF_GUID(g, ff_asf_my_guid);
80
    else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
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    else PRINT_IF_GUID(g, ff_asf_extended_content_header);
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    else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
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    else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
84
    else PRINT_IF_GUID(g, ff_asf_metadata_header);
85
    else PRINT_IF_GUID(g, stream_bitrate_guid);
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    else PRINT_IF_GUID(g, ff_asf_language_guid);
87
    else
88
        dprintf(NULL, "(GUID: unknown) ");
89
    for(i=0;i<16;i++)
90
        dprintf(NULL, " 0x%02x,", (*g)[i]);
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    dprintf(NULL, "}\n");
92
}
93
#undef PRINT_IF_GUID
94
#else
95
#define print_guid(g)
96
#endif
97

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

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

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

    
122
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
123
{
124
    char* q = buf;
125
    while (len > 1) {
126
        uint8_t tmp;
127
        uint32_t ch;
128

    
129
        GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
130
        PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
131
    }
132
    if (len > 0)
133
        url_fskip(pb, len);
134
    *q = '\0';
135
}
136

    
137
static int asf_probe(AVProbeData *pd)
138
{
139
    /* check file header */
140
    if (!guidcmp(pd->buf, &ff_asf_header))
141
        return AVPROBE_SCORE_MAX;
142
    else
143
        return 0;
144
}
145

    
146
static int get_value(ByteIOContext *pb, int type){
147
    switch(type){
148
        case 2: return get_le32(pb);
149
        case 3: return get_le32(pb);
150
        case 4: return get_le64(pb);
151
        case 5: return get_le16(pb);
152
        default:return INT_MIN;
153
    }
154
}
155

    
156
static void get_tag(AVFormatContext *s, const char *key, int type, int len)
157
{
158
    char *value;
159

    
160
    if ((unsigned)len >= (UINT_MAX - 1)/2)
161
        return;
162

    
163
    value = av_malloc(2*len+1);
164
    if (!value)
165
        return;
166

    
167
    if (type == 0) {         // UTF16-LE
168
        get_str16_nolen(s->pb, len, value, 2*len + 1);
169
    } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
170
        uint64_t num = get_value(s->pb, type);
171
        snprintf(value, len, "%"PRIu64, num);
172
    } else {
173
        url_fskip(s->pb, len);
174
        av_freep(&value);
175
        av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
176
        return;
177
    }
178
    av_metadata_set2(&s->metadata, key, value, 0);
179
    av_freep(&value);
180
}
181

    
182
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
183
{
184
    ASFContext *asf = s->priv_data;
185
    ff_asf_guid g;
186
    ByteIOContext *pb = s->pb;
187
    AVStream *st;
188
    ASFStream *asf_st;
189
    int size, i;
190
    int64_t gsize;
191
    AVRational dar[128];
192
    uint32_t bitrate[128];
193

    
194
    memset(dar, 0, sizeof(dar));
195
    memset(bitrate, 0, sizeof(bitrate));
196

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

    
245
            pos1 = url_ftell(pb);
246

    
247
            st = av_new_stream(s, 0);
248
            if (!st)
249
                return AVERROR(ENOMEM);
250
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
251
            asf_st = av_mallocz(sizeof(ASFStream));
252
            if (!asf_st)
253
                return AVERROR(ENOMEM);
254
            st->priv_data = asf_st;
255
            start_time = asf->hdr.preroll;
256

    
257
            asf_st->stream_language_index = 128; // invalid stream index means no language info
258

    
259
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
260
                st->duration = asf->hdr.play_time /
261
                    (10000000 / 1000) - start_time;
262
            }
263
            get_guid(pb, &g);
264

    
265
            test_for_ext_stream_audio = 0;
266
            if (!guidcmp(&g, &ff_asf_audio_stream)) {
267
                type = CODEC_TYPE_AUDIO;
268
            } else if (!guidcmp(&g, &ff_asf_video_stream)) {
269
                type = CODEC_TYPE_VIDEO;
270
            } else if (!guidcmp(&g, &ff_asf_command_stream)) {
271
                type = CODEC_TYPE_DATA;
272
            } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
273
                test_for_ext_stream_audio = 1;
274
                type = CODEC_TYPE_UNKNOWN;
275
            } else {
276
                return -1;
277
            }
278
            get_guid(pb, &g);
279
            total_size = get_le64(pb);
280
            type_specific_size = get_le32(pb);
281
            get_le32(pb);
282
            st->id = get_le16(pb) & 0x7f; /* stream id */
283
            // mapping of asf ID to AV stream ID;
284
            asf->asfid2avid[st->id] = s->nb_streams - 1;
285

    
286
            get_le32(pb);
287

    
288
            if (test_for_ext_stream_audio) {
289
                get_guid(pb, &g);
290
                if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
291
                    type = CODEC_TYPE_AUDIO;
292
                    is_dvr_ms_audio=1;
293
                    get_guid(pb, &g);
294
                    get_le32(pb);
295
                    get_le32(pb);
296
                    get_le32(pb);
297
                    get_guid(pb, &g);
298
                    get_le32(pb);
299
                }
300
            }
301

    
302
            st->codec->codec_type = type;
303
            if (type == CODEC_TYPE_AUDIO) {
304
                ff_get_wav_header(pb, st->codec, type_specific_size);
305
                if (is_dvr_ms_audio) {
306
                    // codec_id and codec_tag are unreliable in dvr_ms
307
                    // files. Set them later by probing stream.
308
                    st->codec->codec_id = CODEC_ID_PROBE;
309
                    st->codec->codec_tag = 0;
310
                }
311
                if (st->codec->codec_id == CODEC_ID_AAC) {
312
                    st->need_parsing = AVSTREAM_PARSE_NONE;
313
                } else {
314
                    st->need_parsing = AVSTREAM_PARSE_FULL;
315
                }
316
                /* We have to init the frame size at some point .... */
317
                pos2 = url_ftell(pb);
318
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
319
                    asf_st->ds_span = get_byte(pb);
320
                    asf_st->ds_packet_size = get_le16(pb);
321
                    asf_st->ds_chunk_size = get_le16(pb);
322
                    get_le16(pb); //ds_data_size
323
                    get_byte(pb); //ds_silence_data
324
                }
325
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
326
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
327
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
328
                if (asf_st->ds_span > 1) {
329
                    if (!asf_st->ds_chunk_size
330
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
331
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
332
                        asf_st->ds_span = 0; // disable descrambling
333
                }
334
                switch (st->codec->codec_id) {
335
                case CODEC_ID_MP3:
336
                    st->codec->frame_size = MPA_FRAME_SIZE;
337
                    break;
338
                case CODEC_ID_PCM_S16LE:
339
                case CODEC_ID_PCM_S16BE:
340
                case CODEC_ID_PCM_U16LE:
341
                case CODEC_ID_PCM_U16BE:
342
                case CODEC_ID_PCM_S8:
343
                case CODEC_ID_PCM_U8:
344
                case CODEC_ID_PCM_ALAW:
345
                case CODEC_ID_PCM_MULAW:
346
                    st->codec->frame_size = 1;
347
                    break;
348
                default:
349
                    /* This is probably wrong, but it prevents a crash later */
350
                    st->codec->frame_size = 1;
351
                    break;
352
                }
353
            } else if (type == CODEC_TYPE_VIDEO) {
354
                get_le32(pb);
355
                get_le32(pb);
356
                get_byte(pb);
357
                size = get_le16(pb); /* size */
358
                sizeX= get_le32(pb); /* size */
359
                st->codec->width = get_le32(pb);
360
                st->codec->height = get_le32(pb);
361
                /* not available for asf */
362
                get_le16(pb); /* panes */
363
                st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
364
                tag1 = get_le32(pb);
365
                url_fskip(pb, 20);
366
//                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
367
                size= sizeX;
368
                if (size > 40) {
369
                    st->codec->extradata_size = size - 40;
370
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
371
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
372
                }
373

    
374
                /* Extract palette from extradata if bpp <= 8 */
375
                /* This code assumes that extradata contains only palette */
376
                /* This is true for all paletted codecs implemented in ffmpeg */
377
                if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
378
                    st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
379
#if HAVE_BIGENDIAN
380
                    for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
381
                        st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
382
#else
383
                    memcpy(st->codec->palctrl->palette, st->codec->extradata,
384
                           FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
385
#endif
386
                    st->codec->palctrl->palette_changed = 1;
387
                }
388

    
389
                st->codec->codec_tag = tag1;
390
                st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
391
                if(tag1 == MKTAG('D', 'V', 'R', ' '))
392
                    st->need_parsing = AVSTREAM_PARSE_FULL;
393
            }
394
            pos2 = url_ftell(pb);
395
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
396
        } else if (!guidcmp(&g, &ff_asf_comment_header)) {
397
            int len1, len2, len3, len4, len5;
398

    
399
            len1 = get_le16(pb);
400
            len2 = get_le16(pb);
401
            len3 = get_le16(pb);
402
            len4 = get_le16(pb);
403
            len5 = get_le16(pb);
404
            get_tag(s, "title"    , 0, len1);
405
            get_tag(s, "author"   , 0, len2);
406
            get_tag(s, "copyright", 0, len3);
407
            get_tag(s, "comment"  , 0, len4);
408
            url_fskip(pb, len5);
409
        } else if (!guidcmp(&g, &stream_bitrate_guid)) {
410
            int stream_count = get_le16(pb);
411
            int j;
412

    
413
//            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
414
//            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
415
            for(j = 0; j < stream_count; j++) {
416
                int flags, bitrate, stream_id;
417

    
418
                flags= get_le16(pb);
419
                bitrate= get_le32(pb);
420
                stream_id= (flags & 0x7f);
421
//                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
422
                asf->stream_bitrates[stream_id]= bitrate;
423
            }
424
        } else if (!guidcmp(&g, &ff_asf_language_guid)) {
425
            int j;
426
            int stream_count = get_le16(pb);
427
            for(j = 0; j < stream_count; j++) {
428
                char lang[6];
429
                unsigned int lang_len = get_byte(pb);
430
                get_str16_nolen(pb, lang_len, lang, sizeof(lang));
431
                if (j < 128)
432
                    av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
433
            }
434
        } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
435
            int desc_count, i;
436

    
437
            desc_count = get_le16(pb);
438
            for(i=0;i<desc_count;i++) {
439
                    int name_len,value_type,value_len;
440
                    char name[1024];
441

    
442
                    name_len = get_le16(pb);
443
                    if (name_len%2)     // must be even, broken lavf versions wrote len-1
444
                        name_len += 1;
445
                    get_str16_nolen(pb, name_len, name, sizeof(name));
446
                    value_type = get_le16(pb);
447
                    value_len  = get_le16(pb);
448
                    if (!value_type && value_len%2)
449
                        value_len += 1;
450
                    get_tag(s, name, value_type, value_len);
451
            }
452
        } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
453
            int n, stream_num, name_len, value_len, value_type, value_num;
454
            n = get_le16(pb);
455

    
456
            for(i=0;i<n;i++) {
457
                char name[1024];
458

    
459
                get_le16(pb); //lang_list_index
460
                stream_num= get_le16(pb);
461
                name_len=   get_le16(pb);
462
                value_type= get_le16(pb);
463
                value_len=  get_le32(pb);
464

    
465
                get_str16_nolen(pb, name_len, name, sizeof(name));
466
//av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
467
                value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
468
                url_fskip(pb, value_len - 2);
469

    
470
                if(stream_num<128){
471
                    if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
472
                    else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
473
                }
474
            }
475
        } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
476
            int ext_len, payload_ext_ct, stream_ct;
477
            uint32_t ext_d, leak_rate, stream_num;
478
            unsigned int stream_languageid_index;
479

    
480
            get_le64(pb); // starttime
481
            get_le64(pb); // endtime
482
            leak_rate = get_le32(pb); // leak-datarate
483
            get_le32(pb); // bucket-datasize
484
            get_le32(pb); // init-bucket-fullness
485
            get_le32(pb); // alt-leak-datarate
486
            get_le32(pb); // alt-bucket-datasize
487
            get_le32(pb); // alt-init-bucket-fullness
488
            get_le32(pb); // max-object-size
489
            get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
490
            stream_num = get_le16(pb); // stream-num
491

    
492
            stream_languageid_index = get_le16(pb); // stream-language-id-index
493
            if (stream_num < 128)
494
                asf->streams[stream_num].stream_language_index = stream_languageid_index;
495

    
496
            get_le64(pb); // avg frametime in 100ns units
497
            stream_ct = get_le16(pb); //stream-name-count
498
            payload_ext_ct = get_le16(pb); //payload-extension-system-count
499

    
500
            if (stream_num < 128)
501
                bitrate[stream_num] = leak_rate;
502

    
503
            for (i=0; i<stream_ct; i++){
504
                get_le16(pb);
505
                ext_len = get_le16(pb);
506
                url_fseek(pb, ext_len, SEEK_CUR);
507
            }
508

    
509
            for (i=0; i<payload_ext_ct; i++){
510
                get_guid(pb, &g);
511
                ext_d=get_le16(pb);
512
                ext_len=get_le32(pb);
513
                url_fseek(pb, ext_len, SEEK_CUR);
514
            }
515

    
516
            // there could be a optional stream properties object to follow
517
            // if so the next iteration will pick it up
518
        } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
519
            int v1, v2;
520
            get_guid(pb, &g);
521
            v1 = get_le32(pb);
522
            v2 = get_le16(pb);
523
#if 0
524
        } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
525
            int len, v1, n, num;
526
            char str[256], *q;
527
            char tag[16];
528

529
            get_guid(pb, &g);
530
            print_guid(&g);
531

532
            n = get_le32(pb);
533
            for(i=0;i<n;i++) {
534
                num = get_le16(pb); /* stream number */
535
                get_str16(pb, str, sizeof(str));
536
                get_str16(pb, str, sizeof(str));
537
                len = get_le16(pb);
538
                q = tag;
539
                while (len > 0) {
540
                    v1 = get_byte(pb);
541
                    if ((q - tag) < sizeof(tag) - 1)
542
                        *q++ = v1;
543
                    len--;
544
                }
545
                *q = '\0';
546
            }
547
#endif
548
        } else if (url_feof(pb)) {
549
            return -1;
550
        } else {
551
            if (!s->keylen) {
552
                if (!guidcmp(&g, &ff_asf_content_encryption)) {
553
                    av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
554
                } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
555
                    av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
556
                } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
557
                    av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
558
                }
559
            }
560
            url_fseek(pb, gsize - 24, SEEK_CUR);
561
        }
562
    }
563
    get_guid(pb, &g);
564
    get_le64(pb);
565
    get_byte(pb);
566
    get_byte(pb);
567
    if (url_feof(pb))
568
        return -1;
569
    asf->data_offset = url_ftell(pb);
570
    asf->packet_size_left = 0;
571

    
572

    
573
    for(i=0; i<128; i++){
574
        int stream_num= asf->asfid2avid[i];
575
        if(stream_num>=0){
576
            AVStream *st = s->streams[stream_num];
577
            if (!st->codec->bit_rate)
578
                st->codec->bit_rate = bitrate[i];
579
            if (dar[i].num > 0 && dar[i].den > 0)
580
                av_reduce(&st->sample_aspect_ratio.num,
581
                          &st->sample_aspect_ratio.den,
582
                          dar[i].num, dar[i].den, INT_MAX);
583
//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);
584

    
585
            // copy and convert language codes to the frontend
586
            if (asf->streams[i].stream_language_index < 128) {
587
                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
588
                if (rfc1766 && strlen(rfc1766) > 1) {
589
                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
590
                    const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
591
                    if (iso6392)
592
                        av_metadata_set(&st->metadata, "language", iso6392);
593
                }
594
            }
595
        }
596
    }
597

    
598
    return 0;
599
}
600

    
601
#define DO_2BITS(bits, var, defval) \
602
    switch (bits & 3) \
603
    { \
604
    case 3: var = get_le32(pb); rsize += 4; break; \
605
    case 2: var = get_le16(pb); rsize += 2; break; \
606
    case 1: var = get_byte(pb); rsize++; break; \
607
    default: var = defval; break; \
608
    }
609

    
610
/**
611
 * Load a single ASF packet into the demuxer.
612
 * @param s demux context
613
 * @param pb context to read data from
614
 * @returns 0 on success, <0 on error
615
 */
616
static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
617
{
618
    ASFContext *asf = s->priv_data;
619
    uint32_t packet_length, padsize;
620
    int rsize = 8;
621
    int c, d, e, off;
622

    
623
    // if we do not know packet size, allow skipping up to 32 kB
624
    off= 32768;
625
    if (s->packet_size > 0)
626
        off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
627

    
628
    c=d=e=-1;
629
    while(off-- > 0){
630
        c=d; d=e;
631
        e= get_byte(pb);
632
        if(c == 0x82 && !d && !e)
633
            break;
634
    }
635

    
636
    if (c != 0x82) {
637
        /**
638
         * This code allows handling of -EAGAIN at packet boundaries (i.e.
639
         * if the packet sync code above triggers -EAGAIN). This does not
640
         * imply complete -EAGAIN handling support at random positions in
641
         * the stream.
642
         */
643
        if (url_ferror(pb) == AVERROR(EAGAIN))
644
            return AVERROR(EAGAIN);
645
        if (!url_feof(pb))
646
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
647
    }
648
    if ((c & 0x8f) == 0x82) {
649
        if (d || e) {
650
            if (!url_feof(pb))
651
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
652
            return -1;
653
        }
654
        c= get_byte(pb);
655
        d= get_byte(pb);
656
        rsize+=3;
657
    }else{
658
        url_fseek(pb, -1, SEEK_CUR); //FIXME
659
    }
660

    
661
    asf->packet_flags    = c;
662
    asf->packet_property = d;
663

    
664
    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
665
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
666
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
667

    
668
    //the following checks prevent overflows and infinite loops
669
    if(!packet_length || packet_length >= (1U<<29)){
670
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
671
        return -1;
672
    }
673
    if(padsize >= packet_length){
674
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
675
        return -1;
676
    }
677

    
678
    asf->packet_timestamp = get_le32(pb);
679
    get_le16(pb); /* duration */
680
    // rsize has at least 11 bytes which have to be present
681

    
682
    if (asf->packet_flags & 0x01) {
683
        asf->packet_segsizetype = get_byte(pb); rsize++;
684
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
685
    } else {
686
        asf->packet_segments = 1;
687
        asf->packet_segsizetype = 0x80;
688
    }
689
    asf->packet_size_left = packet_length - padsize - rsize;
690
    if (packet_length < asf->hdr.min_pktsize)
691
        padsize += asf->hdr.min_pktsize - packet_length;
692
    asf->packet_padsize = padsize;
693
    dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
694
    return 0;
695
}
696

    
697
/**
698
 *
699
 * @return <0 if error
700
 */
701
static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
702
    ASFContext *asf = s->priv_data;
703
    int rsize = 1;
704
    int num = get_byte(pb);
705
    int64_t ts0, ts1;
706

    
707
    asf->packet_segments--;
708
    asf->packet_key_frame = num >> 7;
709
    asf->stream_index = asf->asfid2avid[num & 0x7f];
710
    // sequence should be ignored!
711
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
712
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
713
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
714
//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);
715
    if (asf->packet_replic_size >= 8) {
716
        asf->packet_obj_size = get_le32(pb);
717
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
718
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
719
            return -1;
720
        }
721
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
722
        if(asf->packet_replic_size >= 8+38+4){
723
//            for(i=0; i<asf->packet_replic_size-8; i++)
724
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
725
//            av_log(s, AV_LOG_DEBUG, "\n");
726
            url_fskip(pb, 10);
727
            ts0= get_le64(pb);
728
            ts1= get_le64(pb);
729
            url_fskip(pb, 12);
730
            get_le32(pb);
731
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
732
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
733
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
734
        }else
735
            url_fskip(pb, asf->packet_replic_size - 8);
736
        rsize += asf->packet_replic_size; // FIXME - check validity
737
    } else if (asf->packet_replic_size==1){
738
        // multipacket - frag_offset is beginning timestamp
739
        asf->packet_time_start = asf->packet_frag_offset;
740
        asf->packet_frag_offset = 0;
741
        asf->packet_frag_timestamp = asf->packet_timestamp;
742

    
743
        asf->packet_time_delta = get_byte(pb);
744
        rsize++;
745
    }else if(asf->packet_replic_size!=0){
746
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
747
        return -1;
748
    }
749
    if (asf->packet_flags & 0x01) {
750
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
751
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
752
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
753
            return -1;
754
        }
755
        //printf("Fragsize %d\n", asf->packet_frag_size);
756
    } else {
757
        asf->packet_frag_size = asf->packet_size_left - rsize;
758
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
759
    }
760
    if (asf->packet_replic_size == 1) {
761
        asf->packet_multi_size = asf->packet_frag_size;
762
        if (asf->packet_multi_size > asf->packet_size_left)
763
            return -1;
764
    }
765
    asf->packet_size_left -= rsize;
766
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
767

    
768
    return 0;
769
}
770

    
771
/**
772
 * Parse data from individual ASF packets (which were previously loaded
773
 * with asf_get_packet()).
774
 * @param s demux context
775
 * @param pb context to read data from
776
 * @param pkt pointer to store packet data into
777
 * @returns 0 if data was stored in pkt, <0 on error or 1 if more ASF
778
 *          packets need to be loaded (through asf_get_packet())
779
 */
780
static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
781
{
782
    ASFContext *asf = s->priv_data;
783
    ASFStream *asf_st = 0;
784
    for (;;) {
785
        if(url_feof(pb))
786
            return AVERROR_EOF;
787
        if (asf->packet_size_left < FRAME_HEADER_SIZE
788
            || asf->packet_segments < 1) {
789
            //asf->packet_size_left <= asf->packet_padsize) {
790
            int ret = asf->packet_size_left + asf->packet_padsize;
791
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
792
            assert(ret>=0);
793
            /* fail safe */
794
            url_fskip(pb, ret);
795

    
796
            asf->packet_pos= url_ftell(pb);
797
            if (asf->data_object_size != (uint64_t)-1 &&
798
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
799
                return AVERROR_EOF; /* Do not exceed the size of the data object */
800
            return 1;
801
        }
802
        if (asf->packet_time_start == 0) {
803
            if(asf_read_frame_header(s, pb) < 0){
804
                asf->packet_segments= 0;
805
                continue;
806
            }
807
            if (asf->stream_index < 0
808
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
809
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
810
                ) {
811
                asf->packet_time_start = 0;
812
                /* unhandled packet (should not happen) */
813
                url_fskip(pb, asf->packet_frag_size);
814
                asf->packet_size_left -= asf->packet_frag_size;
815
                if(asf->stream_index < 0)
816
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
817
                continue;
818
            }
819
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
820
        }
821
        asf_st = asf->asf_st;
822

    
823
        if (asf->packet_replic_size == 1) {
824
            // frag_offset is here used as the beginning timestamp
825
            asf->packet_frag_timestamp = asf->packet_time_start;
826
            asf->packet_time_start += asf->packet_time_delta;
827
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
828
            asf->packet_size_left--;
829
            asf->packet_multi_size--;
830
            if (asf->packet_multi_size < asf->packet_obj_size)
831
            {
832
                asf->packet_time_start = 0;
833
                url_fskip(pb, asf->packet_multi_size);
834
                asf->packet_size_left -= asf->packet_multi_size;
835
                continue;
836
            }
837
            asf->packet_multi_size -= asf->packet_obj_size;
838
            //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);
839
        }
840
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
841
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
842
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
843
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
844
                asf_st->frag_offset, asf->packet_frag_size,
845
                asf->packet_obj_size, asf_st->pkt.size);
846
            asf->packet_obj_size= asf_st->pkt.size;
847
        }
848

    
849
        if (   asf_st->pkt.size != asf->packet_obj_size
850
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
851
            if(asf_st->pkt.data){
852
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
853
                asf_st->frag_offset = 0;
854
                av_free_packet(&asf_st->pkt);
855
            }
856
            /* new packet */
857
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
858
            asf_st->seq = asf->packet_seq;
859
            asf_st->pkt.dts = asf->packet_frag_timestamp;
860
            asf_st->pkt.stream_index = asf->stream_index;
861
            asf_st->pkt.pos =
862
            asf_st->packet_pos= asf->packet_pos;
863
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
864
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
865
//s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
866
            if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
867
                asf->packet_key_frame = 1;
868
            if (asf->packet_key_frame)
869
                asf_st->pkt.flags |= PKT_FLAG_KEY;
870
        }
871

    
872
        /* read data */
873
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
874
        //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
875
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
876
        asf->packet_size_left -= asf->packet_frag_size;
877
        if (asf->packet_size_left < 0)
878
            continue;
879

    
880
        if(   asf->packet_frag_offset >= asf_st->pkt.size
881
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
882
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
883
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
884
            continue;
885
        }
886

    
887
        get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
888
                   asf->packet_frag_size);
889
        if (s->key && s->keylen == 20)
890
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
891
                            asf->packet_frag_size);
892
        asf_st->frag_offset += asf->packet_frag_size;
893
        /* test if whole packet is read */
894
        if (asf_st->frag_offset == asf_st->pkt.size) {
895
            //workaround for macroshit radio DVR-MS files
896
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
897
               && asf_st->pkt.size > 100){
898
                int i;
899
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
900
                if(i == asf_st->pkt.size){
901
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
902
                    asf_st->frag_offset = 0;
903
                    av_free_packet(&asf_st->pkt);
904
                    continue;
905
                }
906
            }
907

    
908
            /* return packet */
909
            if (asf_st->ds_span > 1) {
910
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
911
                    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);
912
              }else{
913
                /* packet descrambling */
914
                uint8_t *newdata = av_malloc(asf_st->pkt.size);
915
                if (newdata) {
916
                    int offset = 0;
917
                    while (offset < asf_st->pkt.size) {
918
                        int off = offset / asf_st->ds_chunk_size;
919
                        int row = off / asf_st->ds_span;
920
                        int col = off % asf_st->ds_span;
921
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
922
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
923

    
924
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
925
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
926
                        memcpy(newdata + offset,
927
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
928
                               asf_st->ds_chunk_size);
929
                        offset += asf_st->ds_chunk_size;
930
                    }
931
                    av_free(asf_st->pkt.data);
932
                    asf_st->pkt.data = newdata;
933
                }
934
              }
935
            }
936
            asf_st->frag_offset = 0;
937
            *pkt= asf_st->pkt;
938
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
939
            asf_st->pkt.size = 0;
940
            asf_st->pkt.data = 0;
941
            break; // packet completed
942
        }
943
    }
944
    return 0;
945
}
946

    
947
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
948
{
949
    ASFContext *asf = s->priv_data;
950

    
951
    for (;;) {
952
        int ret;
953

    
954
        /* parse cached packets, if any */
955
        if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
956
            return ret;
957
        if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
958
            assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
959
        asf->packet_time_start = 0;
960
    }
961

    
962
    return 0;
963
}
964

    
965
// Added to support seeking after packets have been read
966
// If information is not reset, read_packet fails due to
967
// leftover information from previous reads
968
static void asf_reset_header(AVFormatContext *s)
969
{
970
    ASFContext *asf = s->priv_data;
971
    ASFStream *asf_st;
972
    int i;
973

    
974
    asf->packet_nb_frames = 0;
975
    asf->packet_size_left = 0;
976
    asf->packet_segments = 0;
977
    asf->packet_flags = 0;
978
    asf->packet_property = 0;
979
    asf->packet_timestamp = 0;
980
    asf->packet_segsizetype = 0;
981
    asf->packet_segments = 0;
982
    asf->packet_seq = 0;
983
    asf->packet_replic_size = 0;
984
    asf->packet_key_frame = 0;
985
    asf->packet_padsize = 0;
986
    asf->packet_frag_offset = 0;
987
    asf->packet_frag_size = 0;
988
    asf->packet_frag_timestamp = 0;
989
    asf->packet_multi_size = 0;
990
    asf->packet_obj_size = 0;
991
    asf->packet_time_delta = 0;
992
    asf->packet_time_start = 0;
993

    
994
    for(i=0; i<s->nb_streams; i++){
995
        asf_st= s->streams[i]->priv_data;
996
        av_free_packet(&asf_st->pkt);
997
        asf_st->frag_offset=0;
998
        asf_st->seq=0;
999
    }
1000
    asf->asf_st= NULL;
1001
}
1002

    
1003
static int asf_read_close(AVFormatContext *s)
1004
{
1005
    int i;
1006

    
1007
    asf_reset_header(s);
1008
    for(i=0;i<s->nb_streams;i++) {
1009
        AVStream *st = s->streams[i];
1010
        av_free(st->codec->palctrl);
1011
    }
1012
    return 0;
1013
}
1014

    
1015
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1016
{
1017
    AVPacket pkt1, *pkt = &pkt1;
1018
    ASFStream *asf_st;
1019
    int64_t pts;
1020
    int64_t pos= *ppos;
1021
    int i;
1022
    int64_t start_pos[s->nb_streams];
1023

    
1024
    for(i=0; i<s->nb_streams; i++){
1025
        start_pos[i]= pos;
1026
    }
1027

    
1028
    if (s->packet_size > 0)
1029
        pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1030
    *ppos= pos;
1031
    url_fseek(s->pb, pos, SEEK_SET);
1032

    
1033
//printf("asf_read_pts\n");
1034
    asf_reset_header(s);
1035
    for(;;){
1036
        if (av_read_frame(s, pkt) < 0){
1037
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1038
            return AV_NOPTS_VALUE;
1039
        }
1040

    
1041
        pts= pkt->pts;
1042

    
1043
        av_free_packet(pkt);
1044
        if(pkt->flags&PKT_FLAG_KEY){
1045
            i= pkt->stream_index;
1046

    
1047
            asf_st= s->streams[i]->priv_data;
1048

    
1049
//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1050
            pos= asf_st->packet_pos;
1051

    
1052
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1053
            start_pos[i]= asf_st->packet_pos + 1;
1054

    
1055
            if(pkt->stream_index == stream_index)
1056
               break;
1057
        }
1058
    }
1059

    
1060
    *ppos= pos;
1061
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1062

    
1063
    return pts;
1064
}
1065

    
1066
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1067
{
1068
    ff_asf_guid g;
1069
    ASFContext *asf = s->priv_data;
1070
    int64_t current_pos= url_ftell(s->pb);
1071
    int i;
1072

    
1073
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1074
    get_guid(s->pb, &g);
1075
    if (!guidcmp(&g, &index_guid)) {
1076
        int64_t itime, last_pos=-1;
1077
        int pct, ict;
1078
        int64_t av_unused gsize= get_le64(s->pb);
1079
        get_guid(s->pb, &g);
1080
        itime=get_le64(s->pb);
1081
        pct=get_le32(s->pb);
1082
        ict=get_le32(s->pb);
1083
        av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1084

    
1085
        for (i=0;i<ict;i++){
1086
            int pktnum=get_le32(s->pb);
1087
            int pktct =get_le16(s->pb);
1088
            int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1089
            int64_t index_pts= av_rescale(itime, i, 10000);
1090

    
1091
            if(pos != last_pos){
1092
            av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1093
            av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1094
            last_pos=pos;
1095
            }
1096
        }
1097
        asf->index_read= 1;
1098
    }
1099
    url_fseek(s->pb, current_pos, SEEK_SET);
1100
}
1101

    
1102
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1103
{
1104
    ASFContext *asf = s->priv_data;
1105
    AVStream *st = s->streams[stream_index];
1106
    int64_t pos;
1107
    int index;
1108

    
1109
    if (s->packet_size <= 0)
1110
        return -1;
1111

    
1112
    /* Try using the protocol's read_seek if available */
1113
    if(s->pb) {
1114
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1115
        if(ret >= 0)
1116
            asf_reset_header(s);
1117
        if (ret != AVERROR(ENOSYS))
1118
            return ret;
1119
    }
1120

    
1121
    if (!asf->index_read)
1122
        asf_build_simple_index(s, stream_index);
1123

    
1124
    if(!(asf->index_read && st->index_entries)){
1125
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1126
            return -1;
1127
    }else{
1128
        index= av_index_search_timestamp(st, pts, flags);
1129
        if(index<0)
1130
            return -1;
1131

    
1132
        /* find the position */
1133
        pos = st->index_entries[index].pos;
1134

    
1135
    // various attempts to find key frame have failed so far
1136
    //    asf_reset_header(s);
1137
    //    url_fseek(s->pb, pos, SEEK_SET);
1138
    //    key_pos = pos;
1139
    //     for(i=0;i<16;i++){
1140
    //         pos = url_ftell(s->pb);
1141
    //         if (av_read_frame(s, &pkt) < 0){
1142
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1143
    //             return -1;
1144
    //         }
1145
    //         asf_st = s->streams[stream_index]->priv_data;
1146
    //         pos += st->parser->frame_offset;
1147
    //
1148
    //         if (pkt.size > b) {
1149
    //             b = pkt.size;
1150
    //             key_pos = pos;
1151
    //         }
1152
    //
1153
    //         av_free_packet(&pkt);
1154
    //     }
1155

    
1156
        /* do the seek */
1157
        av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1158
        url_fseek(s->pb, pos, SEEK_SET);
1159
    }
1160
    asf_reset_header(s);
1161
    return 0;
1162
}
1163

    
1164
AVInputFormat asf_demuxer = {
1165
    "asf",
1166
    NULL_IF_CONFIG_SMALL("ASF format"),
1167
    sizeof(ASFContext),
1168
    asf_probe,
1169
    asf_read_header,
1170
    asf_read_packet,
1171
    asf_read_close,
1172
    asf_read_seek,
1173
    asf_read_pts,
1174
    .metadata_conv = ff_asf_metadata_conv,
1175
};