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ffmpeg / libavformat / asfdec.c @ 2934cd9d

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1
/*
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 * ASF compatible demuxer
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 * Copyright (c) 2000, 2001 Fabrice Bellard
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 *
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 * 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

    
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#undef NDEBUG
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#include <assert.h>
37

    
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#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

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

    
52
int ff_guidcmp(const void *g1, const void *g2)
53
{
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    return memcmp(g1, g2, sizeof(ff_asf_guid));
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}
56

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

    
62
static void print_guid(const ff_asf_guid *g)
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{
64
    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);
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    else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
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    else PRINT_IF_GUID(g, ff_asf_command_stream);
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    else PRINT_IF_GUID(g, ff_asf_comment_header);
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    else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
75
    else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
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    else PRINT_IF_GUID(g, ff_asf_data_header);
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    else PRINT_IF_GUID(g, index_guid);
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    else PRINT_IF_GUID(g, ff_asf_head1_guid);
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    else PRINT_IF_GUID(g, ff_asf_head2_guid);
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    else PRINT_IF_GUID(g, ff_asf_my_guid);
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    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);
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    else PRINT_IF_GUID(g, ff_asf_metadata_header);
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    else PRINT_IF_GUID(g, ff_asf_marker_header);
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    else PRINT_IF_GUID(g, stream_bitrate_guid);
88
    else PRINT_IF_GUID(g, ff_asf_language_guid);
89
    else
90
        dprintf(NULL, "(GUID: unknown) ");
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    for(i=0;i<16;i++)
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        dprintf(NULL, " 0x%02x,", (*g)[i]);
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    dprintf(NULL, "}\n");
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}
95
#undef PRINT_IF_GUID
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#else
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#define print_guid(g)
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#endif
99

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

    
106
static int asf_probe(AVProbeData *pd)
107
{
108
    /* check file header */
109
    if (!ff_guidcmp(pd->buf, &ff_asf_header))
110
        return AVPROBE_SCORE_MAX;
111
    else
112
        return 0;
113
}
114

    
115
static int get_value(ByteIOContext *pb, int type){
116
    switch(type){
117
        case 2: return get_le32(pb);
118
        case 3: return get_le32(pb);
119
        case 4: return get_le64(pb);
120
        case 5: return get_le16(pb);
121
        default:return INT_MIN;
122
    }
123
}
124

    
125
static void get_tag(AVFormatContext *s, const char *key, int type, int len)
126
{
127
    char *value;
128

    
129
    if ((unsigned)len >= (UINT_MAX - 1)/2)
130
        return;
131

    
132
    value = av_malloc(2*len+1);
133
    if (!value)
134
        return;
135

    
136
    if (type == 0) {         // UTF16-LE
137
        avio_get_str16le(s->pb, len, value, 2*len + 1);
138
    } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
139
        uint64_t num = get_value(s->pb, type);
140
        snprintf(value, len, "%"PRIu64, num);
141
    } else {
142
        url_fskip(s->pb, len);
143
        av_freep(&value);
144
        av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
145
        return;
146
    }
147
    av_metadata_set2(&s->metadata, key, value, 0);
148
    av_freep(&value);
149
}
150

    
151
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
152
{
153
    ASFContext *asf = s->priv_data;
154
    ff_asf_guid g;
155
    ByteIOContext *pb = s->pb;
156
    AVStream *st;
157
    ASFStream *asf_st;
158
    int size, i;
159
    int64_t gsize;
160
    AVRational dar[128];
161
    uint32_t bitrate[128];
162

    
163
    memset(dar, 0, sizeof(dar));
164
    memset(bitrate, 0, sizeof(bitrate));
165

    
166
    ff_get_guid(pb, &g);
167
    if (ff_guidcmp(&g, &ff_asf_header))
168
        return -1;
169
    get_le64(pb);
170
    get_le32(pb);
171
    get_byte(pb);
172
    get_byte(pb);
173
    memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
174
    for(;;) {
175
        uint64_t gpos= url_ftell(pb);
176
        int ret;
177
        ff_get_guid(pb, &g);
178
        gsize = get_le64(pb);
179
        dprintf(s, "%08"PRIx64": ", gpos);
180
        print_guid(&g);
181
        dprintf(s, "  size=0x%"PRIx64"\n", gsize);
182
        if (!ff_guidcmp(&g, &ff_asf_data_header)) {
183
            asf->data_object_offset = url_ftell(pb);
184
            // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
185
            if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
186
                asf->data_object_size = gsize - 24;
187
            } else {
188
                asf->data_object_size = (uint64_t)-1;
189
            }
190
            break;
191
        }
192
        if (gsize < 24)
193
            return -1;
194
        if (!ff_guidcmp(&g, &ff_asf_file_header)) {
195
            ff_get_guid(pb, &asf->hdr.guid);
196
            asf->hdr.file_size          = get_le64(pb);
197
            asf->hdr.create_time        = get_le64(pb);
198
            asf->nb_packets             = get_le64(pb);
199
            asf->hdr.play_time          = get_le64(pb);
200
            asf->hdr.send_time          = get_le64(pb);
201
            asf->hdr.preroll            = get_le32(pb);
202
            asf->hdr.ignore             = get_le32(pb);
203
            asf->hdr.flags              = get_le32(pb);
204
            asf->hdr.min_pktsize        = get_le32(pb);
205
            asf->hdr.max_pktsize        = get_le32(pb);
206
            asf->hdr.max_bitrate        = get_le32(pb);
207
            s->packet_size = asf->hdr.max_pktsize;
208
        } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
209
            enum AVMediaType type;
210
            int type_specific_size, sizeX;
211
            uint64_t total_size;
212
            unsigned int tag1;
213
            int64_t pos1, pos2, start_time;
214
            int test_for_ext_stream_audio, is_dvr_ms_audio=0;
215

    
216
            if (s->nb_streams == ASF_MAX_STREAMS) {
217
                av_log(s, AV_LOG_ERROR, "too many streams\n");
218
                return AVERROR(EINVAL);
219
            }
220

    
221
            pos1 = url_ftell(pb);
222

    
223
            st = av_new_stream(s, 0);
224
            if (!st)
225
                return AVERROR(ENOMEM);
226
            av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
227
            asf_st = av_mallocz(sizeof(ASFStream));
228
            if (!asf_st)
229
                return AVERROR(ENOMEM);
230
            st->priv_data = asf_st;
231
            start_time = asf->hdr.preroll;
232

    
233
            asf_st->stream_language_index = 128; // invalid stream index means no language info
234

    
235
            if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
236
                st->duration = asf->hdr.play_time /
237
                    (10000000 / 1000) - start_time;
238
            }
239
            ff_get_guid(pb, &g);
240

    
241
            test_for_ext_stream_audio = 0;
242
            if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
243
                type = AVMEDIA_TYPE_AUDIO;
244
            } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
245
                type = AVMEDIA_TYPE_VIDEO;
246
            } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
247
                type = AVMEDIA_TYPE_VIDEO;
248
                st->codec->codec_id = CODEC_ID_MJPEG;
249
            } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
250
                type = AVMEDIA_TYPE_DATA;
251
            } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
252
                test_for_ext_stream_audio = 1;
253
                type = AVMEDIA_TYPE_UNKNOWN;
254
            } else {
255
                return -1;
256
            }
257
            ff_get_guid(pb, &g);
258
            total_size = get_le64(pb);
259
            type_specific_size = get_le32(pb);
260
            get_le32(pb);
261
            st->id = get_le16(pb) & 0x7f; /* stream id */
262
            // mapping of asf ID to AV stream ID;
263
            asf->asfid2avid[st->id] = s->nb_streams - 1;
264

    
265
            get_le32(pb);
266

    
267
            if (test_for_ext_stream_audio) {
268
                ff_get_guid(pb, &g);
269
                if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
270
                    type = AVMEDIA_TYPE_AUDIO;
271
                    is_dvr_ms_audio=1;
272
                    ff_get_guid(pb, &g);
273
                    get_le32(pb);
274
                    get_le32(pb);
275
                    get_le32(pb);
276
                    ff_get_guid(pb, &g);
277
                    get_le32(pb);
278
                }
279
            }
280

    
281
            st->codec->codec_type = type;
282
            if (type == AVMEDIA_TYPE_AUDIO) {
283
                ff_get_wav_header(pb, st->codec, type_specific_size);
284
                if (is_dvr_ms_audio) {
285
                    // codec_id and codec_tag are unreliable in dvr_ms
286
                    // files. Set them later by probing stream.
287
                    st->codec->codec_id = CODEC_ID_PROBE;
288
                    st->codec->codec_tag = 0;
289
                }
290
                if (st->codec->codec_id == CODEC_ID_AAC) {
291
                    st->need_parsing = AVSTREAM_PARSE_NONE;
292
                } else {
293
                    st->need_parsing = AVSTREAM_PARSE_FULL;
294
                }
295
                /* We have to init the frame size at some point .... */
296
                pos2 = url_ftell(pb);
297
                if (gsize >= (pos2 + 8 - pos1 + 24)) {
298
                    asf_st->ds_span = get_byte(pb);
299
                    asf_st->ds_packet_size = get_le16(pb);
300
                    asf_st->ds_chunk_size = get_le16(pb);
301
                    get_le16(pb); //ds_data_size
302
                    get_byte(pb); //ds_silence_data
303
                }
304
                //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
305
                //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
306
                //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
307
                if (asf_st->ds_span > 1) {
308
                    if (!asf_st->ds_chunk_size
309
                        || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
310
                        || asf_st->ds_packet_size % asf_st->ds_chunk_size)
311
                        asf_st->ds_span = 0; // disable descrambling
312
                }
313
                switch (st->codec->codec_id) {
314
                case CODEC_ID_MP3:
315
                    st->codec->frame_size = MPA_FRAME_SIZE;
316
                    break;
317
                case CODEC_ID_PCM_S16LE:
318
                case CODEC_ID_PCM_S16BE:
319
                case CODEC_ID_PCM_U16LE:
320
                case CODEC_ID_PCM_U16BE:
321
                case CODEC_ID_PCM_S8:
322
                case CODEC_ID_PCM_U8:
323
                case CODEC_ID_PCM_ALAW:
324
                case CODEC_ID_PCM_MULAW:
325
                    st->codec->frame_size = 1;
326
                    break;
327
                default:
328
                    /* This is probably wrong, but it prevents a crash later */
329
                    st->codec->frame_size = 1;
330
                    break;
331
                }
332
            } else if (type == AVMEDIA_TYPE_VIDEO &&
333
                       gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
334
                get_le32(pb);
335
                get_le32(pb);
336
                get_byte(pb);
337
                size = get_le16(pb); /* size */
338
                sizeX= get_le32(pb); /* size */
339
                st->codec->width = get_le32(pb);
340
                st->codec->height = get_le32(pb);
341
                /* not available for asf */
342
                get_le16(pb); /* panes */
343
                st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
344
                tag1 = get_le32(pb);
345
                url_fskip(pb, 20);
346
//                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
347
                size= sizeX;
348
                if (size > 40) {
349
                    st->codec->extradata_size = size - 40;
350
                    st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
351
                    get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
352
                }
353

    
354
                /* Extract palette from extradata if bpp <= 8 */
355
                /* This code assumes that extradata contains only palette */
356
                /* This is true for all paletted codecs implemented in ffmpeg */
357
                if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
358
                    st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
359
#if HAVE_BIGENDIAN
360
                    for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
361
                        st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
362
#else
363
                    memcpy(st->codec->palctrl->palette, st->codec->extradata,
364
                           FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
365
#endif
366
                    st->codec->palctrl->palette_changed = 1;
367
                }
368

    
369
                st->codec->codec_tag = tag1;
370
                st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
371
                if(tag1 == MKTAG('D', 'V', 'R', ' ')){
372
                    st->need_parsing = AVSTREAM_PARSE_FULL;
373
                    // 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
374
                    st->codec->width  =
375
                    st->codec->height = 0;
376
                    av_freep(&st->codec->extradata);
377
                    st->codec->extradata_size=0;
378
                }
379
                if(st->codec->codec_id == CODEC_ID_H264)
380
                    st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
381
            }
382
            pos2 = url_ftell(pb);
383
            url_fskip(pb, gsize - (pos2 - pos1 + 24));
384
        } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
385
            int len1, len2, len3, len4, len5;
386

    
387
            len1 = get_le16(pb);
388
            len2 = get_le16(pb);
389
            len3 = get_le16(pb);
390
            len4 = get_le16(pb);
391
            len5 = get_le16(pb);
392
            get_tag(s, "title"    , 0, len1);
393
            get_tag(s, "author"   , 0, len2);
394
            get_tag(s, "copyright", 0, len3);
395
            get_tag(s, "comment"  , 0, len4);
396
            url_fskip(pb, len5);
397
        } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
398
            int stream_count = get_le16(pb);
399
            int j;
400

    
401
//            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
402
//            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
403
            for(j = 0; j < stream_count; j++) {
404
                int flags, bitrate, stream_id;
405

    
406
                flags= get_le16(pb);
407
                bitrate= get_le32(pb);
408
                stream_id= (flags & 0x7f);
409
//                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
410
                asf->stream_bitrates[stream_id]= bitrate;
411
            }
412
        } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
413
            int j;
414
            int stream_count = get_le16(pb);
415
            for(j = 0; j < stream_count; j++) {
416
                char lang[6];
417
                unsigned int lang_len = get_byte(pb);
418
                if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
419
                    url_fskip(pb, lang_len - ret);
420
                if (j < 128)
421
                    av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
422
            }
423
        } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
424
            int desc_count, i;
425

    
426
            desc_count = get_le16(pb);
427
            for(i=0;i<desc_count;i++) {
428
                    int name_len,value_type,value_len;
429
                    char name[1024];
430

    
431
                    name_len = get_le16(pb);
432
                    if (name_len%2)     // must be even, broken lavf versions wrote len-1
433
                        name_len += 1;
434
                    if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
435
                        url_fskip(pb, name_len - ret);
436
                    value_type = get_le16(pb);
437
                    value_len  = get_le16(pb);
438
                    if (!value_type && value_len%2)
439
                        value_len += 1;
440
                    /**
441
                     * My sample has that stream set to 0 maybe that mean the container.
442
                     * Asf stream count start at 1. I am using 0 to the container value since it's unused
443
                     */
444
                    if (!strcmp(name, "AspectRatioX")){
445
                        dar[0].num= get_value(s->pb, value_type);
446
                    } else if(!strcmp(name, "AspectRatioY")){
447
                        dar[0].den= get_value(s->pb, value_type);
448
                    } else
449
                        get_tag(s, name, value_type, value_len);
450
            }
451
        } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
452
            int n, stream_num, name_len, value_len, value_type, value_num;
453
            n = get_le16(pb);
454

    
455
            for(i=0;i<n;i++) {
456
                char name[1024];
457

    
458
                get_le16(pb); //lang_list_index
459
                stream_num= get_le16(pb);
460
                name_len=   get_le16(pb);
461
                value_type= get_le16(pb);
462
                value_len=  get_le32(pb);
463

    
464
                if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
465
                    url_fskip(pb, name_len - ret);
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 (!ff_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
                ff_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
            continue;
519
        } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
520
            int v1, v2;
521
            ff_get_guid(pb, &g);
522
            v1 = get_le32(pb);
523
            v2 = get_le16(pb);
524
            continue;
525
        } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
526
            int i, count, name_len;
527
            char name[1024];
528

    
529
            get_le64(pb);            // reserved 16 bytes
530
            get_le64(pb);            // ...
531
            count = get_le32(pb);    // markers count
532
            get_le16(pb);            // reserved 2 bytes
533
            name_len = get_le16(pb); // name length
534
            for(i=0;i<name_len;i++){
535
                get_byte(pb); // skip the name
536
            }
537

    
538
            for(i=0;i<count;i++){
539
                int64_t pres_time;
540
                int name_len;
541

    
542
                get_le64(pb);             // offset, 8 bytes
543
                pres_time = get_le64(pb); // presentation time
544
                get_le16(pb);             // entry length
545
                get_le32(pb);             // send time
546
                get_le32(pb);             // flags
547
                name_len = get_le32(pb);  // name length
548
                if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
549
                    url_fskip(pb, name_len - ret);
550
                ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
551
            }
552
        } else if (url_feof(pb)) {
553
            return -1;
554
        } else {
555
            if (!s->keylen) {
556
                if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
557
                    av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
558
                } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
559
                    av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
560
                } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
561
                    av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
562
                }
563
            }
564
        }
565
        if(url_ftell(pb) != gpos + gsize)
566
            av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
567
        url_fseek(pb, gpos + gsize, SEEK_SET);
568
    }
569
    ff_get_guid(pb, &g);
570
    get_le64(pb);
571
    get_byte(pb);
572
    get_byte(pb);
573
    if (url_feof(pb))
574
        return -1;
575
    asf->data_offset = url_ftell(pb);
576
    asf->packet_size_left = 0;
577

    
578

    
579
    for(i=0; i<128; i++){
580
        int stream_num= asf->asfid2avid[i];
581
        if(stream_num>=0){
582
            AVStream *st = s->streams[stream_num];
583
            if (!st->codec->bit_rate)
584
                st->codec->bit_rate = bitrate[i];
585
            if (dar[i].num > 0 && dar[i].den > 0){
586
                av_reduce(&st->sample_aspect_ratio.num,
587
                          &st->sample_aspect_ratio.den,
588
                          dar[i].num, dar[i].den, INT_MAX);
589
            } 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.
590
                av_reduce(&st->sample_aspect_ratio.num,
591
                          &st->sample_aspect_ratio.den,
592
                          dar[0].num, dar[0].den, INT_MAX);
593

    
594
//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);
595

    
596
            // copy and convert language codes to the frontend
597
            if (asf->streams[i].stream_language_index < 128) {
598
                const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
599
                if (rfc1766 && strlen(rfc1766) > 1) {
600
                    const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
601
                    const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
602
                    if (iso6392)
603
                        av_metadata_set2(&st->metadata, "language", iso6392, 0);
604
                }
605
            }
606
        }
607
    }
608

    
609
    ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
610

    
611
    return 0;
612
}
613

    
614
#define DO_2BITS(bits, var, defval) \
615
    switch (bits & 3) \
616
    { \
617
    case 3: var = get_le32(pb); rsize += 4; break; \
618
    case 2: var = get_le16(pb); rsize += 2; break; \
619
    case 1: var = get_byte(pb); rsize++; break; \
620
    default: var = defval; break; \
621
    }
622

    
623
/**
624
 * Load a single ASF packet into the demuxer.
625
 * @param s demux context
626
 * @param pb context to read data from
627
 * @return 0 on success, <0 on error
628
 */
629
static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
630
{
631
    ASFContext *asf = s->priv_data;
632
    uint32_t packet_length, padsize;
633
    int rsize = 8;
634
    int c, d, e, off;
635

    
636
    // if we do not know packet size, allow skipping up to 32 kB
637
    off= 32768;
638
    if (s->packet_size > 0)
639
        off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
640

    
641
    c=d=e=-1;
642
    while(off-- > 0){
643
        c=d; d=e;
644
        e= get_byte(pb);
645
        if(c == 0x82 && !d && !e)
646
            break;
647
    }
648

    
649
    if (c != 0x82) {
650
        /**
651
         * This code allows handling of -EAGAIN at packet boundaries (i.e.
652
         * if the packet sync code above triggers -EAGAIN). This does not
653
         * imply complete -EAGAIN handling support at random positions in
654
         * the stream.
655
         */
656
        if (url_ferror(pb) == AVERROR(EAGAIN))
657
            return AVERROR(EAGAIN);
658
        if (!url_feof(pb))
659
            av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
660
    }
661
    if ((c & 0x8f) == 0x82) {
662
        if (d || e) {
663
            if (!url_feof(pb))
664
                av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
665
            return -1;
666
        }
667
        c= get_byte(pb);
668
        d= get_byte(pb);
669
        rsize+=3;
670
    }else{
671
        url_fseek(pb, -1, SEEK_CUR); //FIXME
672
    }
673

    
674
    asf->packet_flags    = c;
675
    asf->packet_property = d;
676

    
677
    DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
678
    DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
679
    DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
680

    
681
    //the following checks prevent overflows and infinite loops
682
    if(!packet_length || packet_length >= (1U<<29)){
683
        av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
684
        return -1;
685
    }
686
    if(padsize >= packet_length){
687
        av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
688
        return -1;
689
    }
690

    
691
    asf->packet_timestamp = get_le32(pb);
692
    get_le16(pb); /* duration */
693
    // rsize has at least 11 bytes which have to be present
694

    
695
    if (asf->packet_flags & 0x01) {
696
        asf->packet_segsizetype = get_byte(pb); rsize++;
697
        asf->packet_segments = asf->packet_segsizetype & 0x3f;
698
    } else {
699
        asf->packet_segments = 1;
700
        asf->packet_segsizetype = 0x80;
701
    }
702
    asf->packet_size_left = packet_length - padsize - rsize;
703
    if (packet_length < asf->hdr.min_pktsize)
704
        padsize += asf->hdr.min_pktsize - packet_length;
705
    asf->packet_padsize = padsize;
706
    dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
707
    return 0;
708
}
709

    
710
/**
711
 *
712
 * @return <0 if error
713
 */
714
static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
715
    ASFContext *asf = s->priv_data;
716
    int rsize = 1;
717
    int num = get_byte(pb);
718
    int64_t ts0, ts1;
719

    
720
    asf->packet_segments--;
721
    asf->packet_key_frame = num >> 7;
722
    asf->stream_index = asf->asfid2avid[num & 0x7f];
723
    // sequence should be ignored!
724
    DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
725
    DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
726
    DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
727
//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);
728
    if (asf->packet_replic_size >= 8) {
729
        asf->packet_obj_size = get_le32(pb);
730
        if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
731
            av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
732
            return -1;
733
        }
734
        asf->packet_frag_timestamp = get_le32(pb); // timestamp
735
        if(asf->packet_replic_size >= 8+38+4){
736
//            for(i=0; i<asf->packet_replic_size-8; i++)
737
//                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
738
//            av_log(s, AV_LOG_DEBUG, "\n");
739
            url_fskip(pb, 10);
740
            ts0= get_le64(pb);
741
            ts1= get_le64(pb);
742
            url_fskip(pb, 12);
743
            get_le32(pb);
744
            url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
745
            if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
746
            else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
747
        }else
748
            url_fskip(pb, asf->packet_replic_size - 8);
749
        rsize += asf->packet_replic_size; // FIXME - check validity
750
    } else if (asf->packet_replic_size==1){
751
        // multipacket - frag_offset is beginning timestamp
752
        asf->packet_time_start = asf->packet_frag_offset;
753
        asf->packet_frag_offset = 0;
754
        asf->packet_frag_timestamp = asf->packet_timestamp;
755

    
756
        asf->packet_time_delta = get_byte(pb);
757
        rsize++;
758
    }else if(asf->packet_replic_size!=0){
759
        av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
760
        return -1;
761
    }
762
    if (asf->packet_flags & 0x01) {
763
        DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
764
        if(asf->packet_frag_size > asf->packet_size_left - rsize){
765
            av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
766
            return -1;
767
        }
768
        //printf("Fragsize %d\n", asf->packet_frag_size);
769
    } else {
770
        asf->packet_frag_size = asf->packet_size_left - rsize;
771
        //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
772
    }
773
    if (asf->packet_replic_size == 1) {
774
        asf->packet_multi_size = asf->packet_frag_size;
775
        if (asf->packet_multi_size > asf->packet_size_left)
776
            return -1;
777
    }
778
    asf->packet_size_left -= rsize;
779
    //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
780

    
781
    return 0;
782
}
783

    
784
/**
785
 * Parse data from individual ASF packets (which were previously loaded
786
 * with asf_get_packet()).
787
 * @param s demux context
788
 * @param pb context to read data from
789
 * @param pkt pointer to store packet data into
790
 * @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
791
 *          packets need to be loaded (through asf_get_packet())
792
 */
793
static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
794
{
795
    ASFContext *asf = s->priv_data;
796
    ASFStream *asf_st = 0;
797
    for (;;) {
798
        int ret;
799
        if(url_feof(pb))
800
            return AVERROR_EOF;
801
        if (asf->packet_size_left < FRAME_HEADER_SIZE
802
            || asf->packet_segments < 1) {
803
            //asf->packet_size_left <= asf->packet_padsize) {
804
            int ret = asf->packet_size_left + asf->packet_padsize;
805
            //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
806
            assert(ret>=0);
807
            /* fail safe */
808
            url_fskip(pb, ret);
809

    
810
            asf->packet_pos= url_ftell(pb);
811
            if (asf->data_object_size != (uint64_t)-1 &&
812
                (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
813
                return AVERROR_EOF; /* Do not exceed the size of the data object */
814
            return 1;
815
        }
816
        if (asf->packet_time_start == 0) {
817
            if(asf_read_frame_header(s, pb) < 0){
818
                asf->packet_segments= 0;
819
                continue;
820
            }
821
            if (asf->stream_index < 0
822
                || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
823
                || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
824
                ) {
825
                asf->packet_time_start = 0;
826
                /* unhandled packet (should not happen) */
827
                url_fskip(pb, asf->packet_frag_size);
828
                asf->packet_size_left -= asf->packet_frag_size;
829
                if(asf->stream_index < 0)
830
                    av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
831
                continue;
832
            }
833
            asf->asf_st = s->streams[asf->stream_index]->priv_data;
834
        }
835
        asf_st = asf->asf_st;
836

    
837
        if (asf->packet_replic_size == 1) {
838
            // frag_offset is here used as the beginning timestamp
839
            asf->packet_frag_timestamp = asf->packet_time_start;
840
            asf->packet_time_start += asf->packet_time_delta;
841
            asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
842
            asf->packet_size_left--;
843
            asf->packet_multi_size--;
844
            if (asf->packet_multi_size < asf->packet_obj_size)
845
            {
846
                asf->packet_time_start = 0;
847
                url_fskip(pb, asf->packet_multi_size);
848
                asf->packet_size_left -= asf->packet_multi_size;
849
                continue;
850
            }
851
            asf->packet_multi_size -= asf->packet_obj_size;
852
            //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);
853
        }
854
        if(   /*asf->packet_frag_size == asf->packet_obj_size*/
855
              asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
856
           && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
857
            av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
858
                asf_st->frag_offset, asf->packet_frag_size,
859
                asf->packet_obj_size, asf_st->pkt.size);
860
            asf->packet_obj_size= asf_st->pkt.size;
861
        }
862

    
863
        if (   asf_st->pkt.size != asf->packet_obj_size
864
            || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
865
            if(asf_st->pkt.data){
866
                av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
867
                asf_st->frag_offset = 0;
868
                av_free_packet(&asf_st->pkt);
869
            }
870
            /* new packet */
871
            av_new_packet(&asf_st->pkt, asf->packet_obj_size);
872
            asf_st->seq = asf->packet_seq;
873
            asf_st->pkt.dts = asf->packet_frag_timestamp;
874
            asf_st->pkt.stream_index = asf->stream_index;
875
            asf_st->pkt.pos =
876
            asf_st->packet_pos= asf->packet_pos;
877
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
878
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
879
//s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
880
            if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
881
                asf->packet_key_frame = 1;
882
            if (asf->packet_key_frame)
883
                asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
884
        }
885

    
886
        /* read data */
887
        //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
888
        //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
889
        //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
890
        asf->packet_size_left -= asf->packet_frag_size;
891
        if (asf->packet_size_left < 0)
892
            continue;
893

    
894
        if(   asf->packet_frag_offset >= asf_st->pkt.size
895
           || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
896
            av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
897
                asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
898
            continue;
899
        }
900

    
901
        ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
902
                         asf->packet_frag_size);
903
        if (ret != asf->packet_frag_size) {
904
            if (ret < 0 || asf->packet_frag_offset + ret == 0)
905
                return ret < 0 ? ret : AVERROR_EOF;
906
            if (asf_st->ds_span > 1) {
907
                // scrambling, we can either drop it completely or fill the remainder
908
                // TODO: should we fill the whole packet instead of just the current
909
                // fragment?
910
                memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
911
                       asf->packet_frag_size - ret);
912
                ret = asf->packet_frag_size;
913
            } else
914
                // no scrambling, so we can return partial packets
915
                av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
916
        }
917
        if (s->key && s->keylen == 20)
918
            ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
919
                            ret);
920
        asf_st->frag_offset += ret;
921
        /* test if whole packet is read */
922
        if (asf_st->frag_offset == asf_st->pkt.size) {
923
            //workaround for macroshit radio DVR-MS files
924
            if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
925
               && asf_st->pkt.size > 100){
926
                int i;
927
                for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
928
                if(i == asf_st->pkt.size){
929
                    av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
930
                    asf_st->frag_offset = 0;
931
                    av_free_packet(&asf_st->pkt);
932
                    continue;
933
                }
934
            }
935

    
936
            /* return packet */
937
            if (asf_st->ds_span > 1) {
938
              if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
939
                    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);
940
              }else{
941
                /* packet descrambling */
942
                uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
943
                if (newdata) {
944
                    int offset = 0;
945
                    memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
946
                    while (offset < asf_st->pkt.size) {
947
                        int off = offset / asf_st->ds_chunk_size;
948
                        int row = off / asf_st->ds_span;
949
                        int col = off % asf_st->ds_span;
950
                        int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
951
                        //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
952

    
953
                        assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
954
                        assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
955
                        memcpy(newdata + offset,
956
                               asf_st->pkt.data + idx * asf_st->ds_chunk_size,
957
                               asf_st->ds_chunk_size);
958
                        offset += asf_st->ds_chunk_size;
959
                    }
960
                    av_free(asf_st->pkt.data);
961
                    asf_st->pkt.data = newdata;
962
                }
963
              }
964
            }
965
            asf_st->frag_offset = 0;
966
            *pkt= asf_st->pkt;
967
            //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
968
            asf_st->pkt.size = 0;
969
            asf_st->pkt.data = 0;
970
            break; // packet completed
971
        }
972
    }
973
    return 0;
974
}
975

    
976
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
977
{
978
    ASFContext *asf = s->priv_data;
979

    
980
    for (;;) {
981
        int ret;
982

    
983
        /* parse cached packets, if any */
984
        if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
985
            return ret;
986
        if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
987
            assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
988
        asf->packet_time_start = 0;
989
    }
990

    
991
    return 0;
992
}
993

    
994
// Added to support seeking after packets have been read
995
// If information is not reset, read_packet fails due to
996
// leftover information from previous reads
997
static void asf_reset_header(AVFormatContext *s)
998
{
999
    ASFContext *asf = s->priv_data;
1000
    ASFStream *asf_st;
1001
    int i;
1002

    
1003
    asf->packet_nb_frames = 0;
1004
    asf->packet_size_left = 0;
1005
    asf->packet_segments = 0;
1006
    asf->packet_flags = 0;
1007
    asf->packet_property = 0;
1008
    asf->packet_timestamp = 0;
1009
    asf->packet_segsizetype = 0;
1010
    asf->packet_segments = 0;
1011
    asf->packet_seq = 0;
1012
    asf->packet_replic_size = 0;
1013
    asf->packet_key_frame = 0;
1014
    asf->packet_padsize = 0;
1015
    asf->packet_frag_offset = 0;
1016
    asf->packet_frag_size = 0;
1017
    asf->packet_frag_timestamp = 0;
1018
    asf->packet_multi_size = 0;
1019
    asf->packet_obj_size = 0;
1020
    asf->packet_time_delta = 0;
1021
    asf->packet_time_start = 0;
1022

    
1023
    for(i=0; i<s->nb_streams; i++){
1024
        asf_st= s->streams[i]->priv_data;
1025
        av_free_packet(&asf_st->pkt);
1026
        asf_st->frag_offset=0;
1027
        asf_st->seq=0;
1028
    }
1029
    asf->asf_st= NULL;
1030
}
1031

    
1032
static int asf_read_close(AVFormatContext *s)
1033
{
1034
    int i;
1035

    
1036
    asf_reset_header(s);
1037
    for(i=0;i<s->nb_streams;i++) {
1038
        AVStream *st = s->streams[i];
1039
        av_free(st->codec->palctrl);
1040
    }
1041
    return 0;
1042
}
1043

    
1044
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
1045
{
1046
    AVPacket pkt1, *pkt = &pkt1;
1047
    ASFStream *asf_st;
1048
    int64_t pts;
1049
    int64_t pos= *ppos;
1050
    int i;
1051
    int64_t start_pos[ASF_MAX_STREAMS];
1052

    
1053
    for(i=0; i<s->nb_streams; i++){
1054
        start_pos[i]= pos;
1055
    }
1056

    
1057
    if (s->packet_size > 0)
1058
        pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
1059
    *ppos= pos;
1060
    url_fseek(s->pb, pos, SEEK_SET);
1061

    
1062
//printf("asf_read_pts\n");
1063
    asf_reset_header(s);
1064
    for(;;){
1065
        if (av_read_frame(s, pkt) < 0){
1066
            av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
1067
            return AV_NOPTS_VALUE;
1068
        }
1069

    
1070
        pts= pkt->pts;
1071

    
1072
        av_free_packet(pkt);
1073
        if(pkt->flags&AV_PKT_FLAG_KEY){
1074
            i= pkt->stream_index;
1075

    
1076
            asf_st= s->streams[i]->priv_data;
1077

    
1078
//            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
1079
            pos= asf_st->packet_pos;
1080

    
1081
            av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
1082
            start_pos[i]= asf_st->packet_pos + 1;
1083

    
1084
            if(pkt->stream_index == stream_index)
1085
               break;
1086
        }
1087
    }
1088

    
1089
    *ppos= pos;
1090
//printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
1091

    
1092
    return pts;
1093
}
1094

    
1095
static void asf_build_simple_index(AVFormatContext *s, int stream_index)
1096
{
1097
    ff_asf_guid g;
1098
    ASFContext *asf = s->priv_data;
1099
    int64_t current_pos= url_ftell(s->pb);
1100
    int i;
1101

    
1102
    url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
1103
    ff_get_guid(s->pb, &g);
1104

    
1105
    /* the data object can be followed by other top-level objects,
1106
       skip them until the simple index object is reached */
1107
    while (ff_guidcmp(&g, &index_guid)) {
1108
        int64_t gsize= get_le64(s->pb);
1109
        if (gsize < 24 || url_feof(s->pb)) {
1110
            url_fseek(s->pb, current_pos, SEEK_SET);
1111
            return;
1112
        }
1113
        url_fseek(s->pb, gsize-24, SEEK_CUR);
1114
        ff_get_guid(s->pb, &g);
1115
    }
1116

    
1117
    {
1118
        int64_t itime, last_pos=-1;
1119
        int pct, ict;
1120
        int64_t av_unused gsize= get_le64(s->pb);
1121
        ff_get_guid(s->pb, &g);
1122
        itime=get_le64(s->pb);
1123
        pct=get_le32(s->pb);
1124
        ict=get_le32(s->pb);
1125
        av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
1126

    
1127
        for (i=0;i<ict;i++){
1128
            int pktnum=get_le32(s->pb);
1129
            int pktct =get_le16(s->pb);
1130
            int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
1131
            int64_t index_pts= av_rescale(itime, i, 10000);
1132

    
1133
            if(pos != last_pos){
1134
            av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
1135
            av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
1136
            last_pos=pos;
1137
            }
1138
        }
1139
        asf->index_read= 1;
1140
    }
1141
    url_fseek(s->pb, current_pos, SEEK_SET);
1142
}
1143

    
1144
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
1145
{
1146
    ASFContext *asf = s->priv_data;
1147
    AVStream *st = s->streams[stream_index];
1148
    int64_t pos;
1149
    int index;
1150

    
1151
    if (s->packet_size <= 0)
1152
        return -1;
1153

    
1154
    /* Try using the protocol's read_seek if available */
1155
    if(s->pb) {
1156
        int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
1157
        if(ret >= 0)
1158
            asf_reset_header(s);
1159
        if (ret != AVERROR(ENOSYS))
1160
            return ret;
1161
    }
1162

    
1163
    if (!asf->index_read)
1164
        asf_build_simple_index(s, stream_index);
1165

    
1166
    if(!(asf->index_read && st->index_entries)){
1167
        if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
1168
            return -1;
1169
    }else{
1170
        index= av_index_search_timestamp(st, pts, flags);
1171
        if(index<0)
1172
            return -1;
1173

    
1174
        /* find the position */
1175
        pos = st->index_entries[index].pos;
1176

    
1177
    // various attempts to find key frame have failed so far
1178
    //    asf_reset_header(s);
1179
    //    url_fseek(s->pb, pos, SEEK_SET);
1180
    //    key_pos = pos;
1181
    //     for(i=0;i<16;i++){
1182
    //         pos = url_ftell(s->pb);
1183
    //         if (av_read_frame(s, &pkt) < 0){
1184
    //             av_log(s, AV_LOG_INFO, "seek failed\n");
1185
    //             return -1;
1186
    //         }
1187
    //         asf_st = s->streams[stream_index]->priv_data;
1188
    //         pos += st->parser->frame_offset;
1189
    //
1190
    //         if (pkt.size > b) {
1191
    //             b = pkt.size;
1192
    //             key_pos = pos;
1193
    //         }
1194
    //
1195
    //         av_free_packet(&pkt);
1196
    //     }
1197

    
1198
        /* do the seek */
1199
        av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
1200
        url_fseek(s->pb, pos, SEEK_SET);
1201
    }
1202
    asf_reset_header(s);
1203
    return 0;
1204
}
1205

    
1206
AVInputFormat asf_demuxer = {
1207
    "asf",
1208
    NULL_IF_CONFIG_SMALL("ASF format"),
1209
    sizeof(ASFContext),
1210
    asf_probe,
1211
    asf_read_header,
1212
    asf_read_packet,
1213
    asf_read_close,
1214
    asf_read_seek,
1215
    asf_read_pts,
1216
};