FFmpeg: libavformat/asfdec.c Source File

00001 /*
00002  * ASF compatible demuxer
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 //#define DEBUG
00023 
00024 #include "libavutil/common.h"
00025 #include "libavutil/avstring.h"
00026 #include "libavcodec/mpegaudio.h"
00027 #include "avformat.h"
00028 #include "riff.h"
00029 #include "asf.h"
00030 #include "asfcrypt.h"
00031 #include "avlanguage.h"
00032 
00033 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
00034 
00035 #undef NDEBUG
00036 #include <assert.h>
00037 
00038 #define FRAME_HEADER_SIZE 17
00039 // Fix Me! FRAME_HEADER_SIZE may be different.
00040 
00041 static const ff_asf_guid index_guid = {
00042     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
00043 };
00044 
00045 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
00046     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
00047 };
00048 /**********************************/
00049 /* decoding */
00050 
00051 static int guidcmp(const void *g1, const void *g2)
00052 {
00053     return memcmp(g1, g2, sizeof(ff_asf_guid));
00054 }
00055 
00056 #ifdef DEBUG
00057 #define PRINT_IF_GUID(g,cmp) \
00058 if (!guidcmp(g, &cmp)) \
00059     dprintf(NULL, "(GUID: %s) ", #cmp)
00060 
00061 static void print_guid(const ff_asf_guid *g)
00062 {
00063     int i;
00064     PRINT_IF_GUID(g, ff_asf_header);
00065     else PRINT_IF_GUID(g, ff_asf_file_header);
00066     else PRINT_IF_GUID(g, ff_asf_stream_header);
00067     else PRINT_IF_GUID(g, ff_asf_audio_stream);
00068     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
00069     else PRINT_IF_GUID(g, ff_asf_video_stream);
00070     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
00071     else PRINT_IF_GUID(g, ff_asf_command_stream);
00072     else PRINT_IF_GUID(g, ff_asf_comment_header);
00073     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
00074     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
00075     else PRINT_IF_GUID(g, ff_asf_data_header);
00076     else PRINT_IF_GUID(g, index_guid);
00077     else PRINT_IF_GUID(g, ff_asf_head1_guid);
00078     else PRINT_IF_GUID(g, ff_asf_head2_guid);
00079     else PRINT_IF_GUID(g, ff_asf_my_guid);
00080     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
00081     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
00082     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
00083     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
00084     else PRINT_IF_GUID(g, ff_asf_metadata_header);
00085     else PRINT_IF_GUID(g, ff_asf_marker_header);
00086     else PRINT_IF_GUID(g, stream_bitrate_guid);
00087     else PRINT_IF_GUID(g, ff_asf_language_guid);
00088     else
00089         dprintf(NULL, "(GUID: unknown) ");
00090     for(i=0;i<16;i++)
00091         dprintf(NULL, " 0x%02x,", (*g)[i]);
00092     dprintf(NULL, "}\n");
00093 }
00094 #undef PRINT_IF_GUID
00095 #else
00096 #define print_guid(g)
00097 #endif
00098 
00099 static void get_guid(ByteIOContext *s, ff_asf_guid *g)
00100 {
00101     assert(sizeof(*g) == 16);
00102     get_buffer(s, *g, sizeof(*g));
00103 }
00104 
00105 #if 0
00106 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
00107 {
00108     int len, c;
00109     char *q;
00110 
00111     len = get_le16(pb);
00112     q = buf;
00113     while (len > 0) {
00114         c = get_le16(pb);
00115         if ((q - buf) < buf_size - 1)
00116             *q++ = c;
00117         len--;
00118     }
00119     *q = '\0';
00120 }
00121 #endif
00122 
00123 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
00124 {
00125     char* q = buf;
00126     while (len > 1) {
00127         uint8_t tmp;
00128         uint32_t ch;
00129 
00130         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
00131         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
00132     }
00133     if (len > 0)
00134         url_fskip(pb, len);
00135     *q = '\0';
00136 }
00137 
00138 static int asf_probe(AVProbeData *pd)
00139 {
00140     /* check file header */
00141     if (!guidcmp(pd->buf, &ff_asf_header))
00142         return AVPROBE_SCORE_MAX;
00143     else
00144         return 0;
00145 }
00146 
00147 static int get_value(ByteIOContext *pb, int type){
00148     switch(type){
00149         case 2: return get_le32(pb);
00150         case 3: return get_le32(pb);
00151         case 4: return get_le64(pb);
00152         case 5: return get_le16(pb);
00153         default:return INT_MIN;
00154     }
00155 }
00156 
00157 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
00158 {
00159     char *value;
00160 
00161     if ((unsigned)len >= (UINT_MAX - 1)/2)
00162         return;
00163 
00164     value = av_malloc(2*len+1);
00165     if (!value)
00166         return;
00167 
00168     if (type == 0) {         // UTF16-LE
00169         get_str16_nolen(s->pb, len, value, 2*len + 1);
00170     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
00171         uint64_t num = get_value(s->pb, type);
00172         snprintf(value, len, "%"PRIu64, num);
00173     } else {
00174         url_fskip(s->pb, len);
00175         av_freep(&value);
00176         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
00177         return;
00178     }
00179     av_metadata_set2(&s->metadata, key, value, 0);
00180     av_freep(&value);
00181 }
00182 
00183 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
00184 {
00185     ASFContext *asf = s->priv_data;
00186     ff_asf_guid g;
00187     ByteIOContext *pb = s->pb;
00188     AVStream *st;
00189     ASFStream *asf_st;
00190     int size, i;
00191     int64_t gsize;
00192     AVRational dar[128];
00193     uint32_t bitrate[128];
00194 
00195     memset(dar, 0, sizeof(dar));
00196     memset(bitrate, 0, sizeof(bitrate));
00197 
00198     get_guid(pb, &g);
00199     if (guidcmp(&g, &ff_asf_header))
00200         return -1;
00201     get_le64(pb);
00202     get_le32(pb);
00203     get_byte(pb);
00204     get_byte(pb);
00205     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00206     for(;;) {
00207         uint64_t gpos= url_ftell(pb);
00208         get_guid(pb, &g);
00209         gsize = get_le64(pb);
00210         dprintf(s, "%08"PRIx64": ", gpos);
00211         print_guid(&g);
00212         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
00213         if (!guidcmp(&g, &ff_asf_data_header)) {
00214             asf->data_object_offset = url_ftell(pb);
00215             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00216             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00217                 asf->data_object_size = gsize - 24;
00218             } else {
00219                 asf->data_object_size = (uint64_t)-1;
00220             }
00221             break;
00222         }
00223         if (gsize < 24)
00224             return -1;
00225         if (!guidcmp(&g, &ff_asf_file_header)) {
00226             get_guid(pb, &asf->hdr.guid);
00227             asf->hdr.file_size          = get_le64(pb);
00228             asf->hdr.create_time        = get_le64(pb);
00229             asf->nb_packets             = get_le64(pb);
00230             asf->hdr.play_time          = get_le64(pb);
00231             asf->hdr.send_time          = get_le64(pb);
00232             asf->hdr.preroll            = get_le32(pb);
00233             asf->hdr.ignore             = get_le32(pb);
00234             asf->hdr.flags              = get_le32(pb);
00235             asf->hdr.min_pktsize        = get_le32(pb);
00236             asf->hdr.max_pktsize        = get_le32(pb);
00237             asf->hdr.max_bitrate        = get_le32(pb);
00238             s->packet_size = asf->hdr.max_pktsize;
00239         } else if (!guidcmp(&g, &ff_asf_stream_header)) {
00240             enum AVMediaType type;
00241             int type_specific_size, sizeX;
00242             uint64_t total_size;
00243             unsigned int tag1;
00244             int64_t pos1, pos2, start_time;
00245             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
00246 
00247             pos1 = url_ftell(pb);
00248 
00249             st = av_new_stream(s, 0);
00250             if (!st)
00251                 return AVERROR(ENOMEM);
00252             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00253             asf_st = av_mallocz(sizeof(ASFStream));
00254             if (!asf_st)
00255                 return AVERROR(ENOMEM);
00256             st->priv_data = asf_st;
00257             start_time = asf->hdr.preroll;
00258 
00259             asf_st->stream_language_index = 128; // invalid stream index means no language info
00260 
00261             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00262                 st->duration = asf->hdr.play_time /
00263                     (10000000 / 1000) - start_time;
00264             }
00265             get_guid(pb, &g);
00266 
00267             test_for_ext_stream_audio = 0;
00268             if (!guidcmp(&g, &ff_asf_audio_stream)) {
00269                 type = AVMEDIA_TYPE_AUDIO;
00270             } else if (!guidcmp(&g, &ff_asf_video_stream)) {
00271                 type = AVMEDIA_TYPE_VIDEO;
00272             } else if (!guidcmp(&g, &ff_asf_command_stream)) {
00273                 type = AVMEDIA_TYPE_DATA;
00274             } else if (!guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
00275                 test_for_ext_stream_audio = 1;
00276                 type = AVMEDIA_TYPE_UNKNOWN;
00277             } else {
00278                 return -1;
00279             }
00280             get_guid(pb, &g);
00281             total_size = get_le64(pb);
00282             type_specific_size = get_le32(pb);
00283             get_le32(pb);
00284             st->id = get_le16(pb) & 0x7f; /* stream id */
00285             // mapping of asf ID to AV stream ID;
00286             asf->asfid2avid[st->id] = s->nb_streams - 1;
00287 
00288             get_le32(pb);
00289 
00290             if (test_for_ext_stream_audio) {
00291                 get_guid(pb, &g);
00292                 if (!guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
00293                     type = AVMEDIA_TYPE_AUDIO;
00294                     is_dvr_ms_audio=1;
00295                     get_guid(pb, &g);
00296                     get_le32(pb);
00297                     get_le32(pb);
00298                     get_le32(pb);
00299                     get_guid(pb, &g);
00300                     get_le32(pb);
00301                 }
00302             }
00303 
00304             st->codec->codec_type = type;
00305             if (type == AVMEDIA_TYPE_AUDIO) {
00306                 ff_get_wav_header(pb, st->codec, type_specific_size);
00307                 if (is_dvr_ms_audio) {
00308                     // codec_id and codec_tag are unreliable in dvr_ms
00309                     // files. Set them later by probing stream.
00310                     st->codec->codec_id = CODEC_ID_PROBE;
00311                     st->codec->codec_tag = 0;
00312                 }
00313                 if (st->codec->codec_id == CODEC_ID_AAC) {
00314                     st->need_parsing = AVSTREAM_PARSE_NONE;
00315                 } else {
00316                     st->need_parsing = AVSTREAM_PARSE_FULL;
00317                 }
00318                 /* We have to init the frame size at some point .... */
00319                 pos2 = url_ftell(pb);
00320                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
00321                     asf_st->ds_span = get_byte(pb);
00322                     asf_st->ds_packet_size = get_le16(pb);
00323                     asf_st->ds_chunk_size = get_le16(pb);
00324                     get_le16(pb); //ds_data_size
00325                     get_byte(pb); //ds_silence_data
00326                 }
00327                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
00328                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
00329                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
00330                 if (asf_st->ds_span > 1) {
00331                     if (!asf_st->ds_chunk_size
00332                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00333                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00334                         asf_st->ds_span = 0; // disable descrambling
00335                 }
00336                 switch (st->codec->codec_id) {
00337                 case CODEC_ID_MP3:
00338                     st->codec->frame_size = MPA_FRAME_SIZE;
00339                     break;
00340                 case CODEC_ID_PCM_S16LE:
00341                 case CODEC_ID_PCM_S16BE:
00342                 case CODEC_ID_PCM_U16LE:
00343                 case CODEC_ID_PCM_U16BE:
00344                 case CODEC_ID_PCM_S8:
00345                 case CODEC_ID_PCM_U8:
00346                 case CODEC_ID_PCM_ALAW:
00347                 case CODEC_ID_PCM_MULAW:
00348                     st->codec->frame_size = 1;
00349                     break;
00350                 default:
00351                     /* This is probably wrong, but it prevents a crash later */
00352                     st->codec->frame_size = 1;
00353                     break;
00354                 }
00355             } else if (type == AVMEDIA_TYPE_VIDEO) {
00356                 get_le32(pb);
00357                 get_le32(pb);
00358                 get_byte(pb);
00359                 size = get_le16(pb); /* size */
00360                 sizeX= get_le32(pb); /* size */
00361                 st->codec->width = get_le32(pb);
00362                 st->codec->height = get_le32(pb);
00363                 /* not available for asf */
00364                 get_le16(pb); /* panes */
00365                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
00366                 tag1 = get_le32(pb);
00367                 url_fskip(pb, 20);
00368 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
00369                 size= sizeX;
00370                 if (size > 40) {
00371                     st->codec->extradata_size = size - 40;
00372                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00373                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
00374                 }
00375 
00376                 /* Extract palette from extradata if bpp <= 8 */
00377                 /* This code assumes that extradata contains only palette */
00378                 /* This is true for all paletted codecs implemented in ffmpeg */
00379                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00380                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
00381 #if HAVE_BIGENDIAN
00382                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00383                         st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
00384 #else
00385                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
00386                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00387 #endif
00388                     st->codec->palctrl->palette_changed = 1;
00389                 }
00390 
00391                 st->codec->codec_tag = tag1;
00392                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00393                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
00394                     st->need_parsing = AVSTREAM_PARSE_FULL;
00395             }
00396             pos2 = url_ftell(pb);
00397             url_fskip(pb, gsize - (pos2 - pos1 + 24));
00398         } else if (!guidcmp(&g, &ff_asf_comment_header)) {
00399             int len1, len2, len3, len4, len5;
00400 
00401             len1 = get_le16(pb);
00402             len2 = get_le16(pb);
00403             len3 = get_le16(pb);
00404             len4 = get_le16(pb);
00405             len5 = get_le16(pb);
00406             get_tag(s, "title"    , 0, len1);
00407             get_tag(s, "author"   , 0, len2);
00408             get_tag(s, "copyright", 0, len3);
00409             get_tag(s, "comment"  , 0, len4);
00410             url_fskip(pb, len5);
00411         } else if (!guidcmp(&g, &stream_bitrate_guid)) {
00412             int stream_count = get_le16(pb);
00413             int j;
00414 
00415 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
00416 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
00417             for(j = 0; j < stream_count; j++) {
00418                 int flags, bitrate, stream_id;
00419 
00420                 flags= get_le16(pb);
00421                 bitrate= get_le32(pb);
00422                 stream_id= (flags & 0x7f);
00423 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
00424                 asf->stream_bitrates[stream_id]= bitrate;
00425             }
00426         } else if (!guidcmp(&g, &ff_asf_language_guid)) {
00427             int j;
00428             int stream_count = get_le16(pb);
00429             for(j = 0; j < stream_count; j++) {
00430                 char lang[6];
00431                 unsigned int lang_len = get_byte(pb);
00432                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
00433                 if (j < 128)
00434                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
00435             }
00436         } else if (!guidcmp(&g, &ff_asf_extended_content_header)) {
00437             int desc_count, i;
00438 
00439             desc_count = get_le16(pb);
00440             for(i=0;i<desc_count;i++) {
00441                     int name_len,value_type,value_len;
00442                     char name[1024];
00443 
00444                     name_len = get_le16(pb);
00445                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
00446                         name_len += 1;
00447                     get_str16_nolen(pb, name_len, name, sizeof(name));
00448                     value_type = get_le16(pb);
00449                     value_len  = get_le16(pb);
00450                     if (!value_type && value_len%2)
00451                         value_len += 1;
00452                     get_tag(s, name, value_type, value_len);
00453             }
00454         } else if (!guidcmp(&g, &ff_asf_metadata_header)) {
00455             int n, stream_num, name_len, value_len, value_type, value_num;
00456             n = get_le16(pb);
00457 
00458             for(i=0;i<n;i++) {
00459                 char name[1024];
00460 
00461                 get_le16(pb); //lang_list_index
00462                 stream_num= get_le16(pb);
00463                 name_len=   get_le16(pb);
00464                 value_type= get_le16(pb);
00465                 value_len=  get_le32(pb);
00466 
00467                 get_str16_nolen(pb, name_len, name, sizeof(name));
00468 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
00469                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00470                 url_fskip(pb, value_len - 2);
00471 
00472                 if(stream_num<128){
00473                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
00474                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
00475                 }
00476             }
00477         } else if (!guidcmp(&g, &ff_asf_ext_stream_header)) {
00478             int ext_len, payload_ext_ct, stream_ct;
00479             uint32_t ext_d, leak_rate, stream_num;
00480             unsigned int stream_languageid_index;
00481 
00482             get_le64(pb); // starttime
00483             get_le64(pb); // endtime
00484             leak_rate = get_le32(pb); // leak-datarate
00485             get_le32(pb); // bucket-datasize
00486             get_le32(pb); // init-bucket-fullness
00487             get_le32(pb); // alt-leak-datarate
00488             get_le32(pb); // alt-bucket-datasize
00489             get_le32(pb); // alt-init-bucket-fullness
00490             get_le32(pb); // max-object-size
00491             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00492             stream_num = get_le16(pb); // stream-num
00493 
00494             stream_languageid_index = get_le16(pb); // stream-language-id-index
00495             if (stream_num < 128)
00496                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
00497 
00498             get_le64(pb); // avg frametime in 100ns units
00499             stream_ct = get_le16(pb); //stream-name-count
00500             payload_ext_ct = get_le16(pb); //payload-extension-system-count
00501 
00502             if (stream_num < 128)
00503                 bitrate[stream_num] = leak_rate;
00504 
00505             for (i=0; i<stream_ct; i++){
00506                 get_le16(pb);
00507                 ext_len = get_le16(pb);
00508                 url_fseek(pb, ext_len, SEEK_CUR);
00509             }
00510 
00511             for (i=0; i<payload_ext_ct; i++){
00512                 get_guid(pb, &g);
00513                 ext_d=get_le16(pb);
00514                 ext_len=get_le32(pb);
00515                 url_fseek(pb, ext_len, SEEK_CUR);
00516             }
00517 
00518             // there could be a optional stream properties object to follow
00519             // if so the next iteration will pick it up
00520         } else if (!guidcmp(&g, &ff_asf_head1_guid)) {
00521             int v1, v2;
00522             get_guid(pb, &g);
00523             v1 = get_le32(pb);
00524             v2 = get_le16(pb);
00525         } else if (!guidcmp(&g, &ff_asf_marker_header)) {
00526             int i, count, name_len;
00527             char name[1024];
00528 
00529             get_le64(pb);            // reserved 16 bytes
00530             get_le64(pb);            // ...
00531             count = get_le32(pb);    // markers count
00532             get_le16(pb);            // reserved 2 bytes
00533             name_len = get_le16(pb); // name length
00534             for(i=0;i<name_len;i++){
00535                 get_byte(pb); // skip the name
00536             }
00537 
00538             for(i=0;i<count;i++){
00539                 int64_t pres_time;
00540                 int name_len;
00541 
00542                 get_le64(pb);             // offset, 8 bytes
00543                 pres_time = get_le64(pb); // presentation time
00544                 get_le16(pb);             // entry length
00545                 get_le32(pb);             // send time
00546                 get_le32(pb);             // flags
00547                 name_len = get_le32(pb);  // name length
00548                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
00549                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
00550             }
00551 #if 0
00552         } else if (!guidcmp(&g, &ff_asf_codec_comment_header)) {
00553             int len, v1, n, num;
00554             char str[256], *q;
00555             char tag[16];
00556 
00557             get_guid(pb, &g);
00558             print_guid(&g);
00559 
00560             n = get_le32(pb);
00561             for(i=0;i<n;i++) {
00562                 num = get_le16(pb); /* stream number */
00563                 get_str16(pb, str, sizeof(str));
00564                 get_str16(pb, str, sizeof(str));
00565                 len = get_le16(pb);
00566                 q = tag;
00567                 while (len > 0) {
00568                     v1 = get_byte(pb);
00569                     if ((q - tag) < sizeof(tag) - 1)
00570                         *q++ = v1;
00571                     len--;
00572                 }
00573                 *q = '\0';
00574             }
00575 #endif
00576         } else if (url_feof(pb)) {
00577             return -1;
00578         } else {
00579             if (!s->keylen) {
00580                 if (!guidcmp(&g, &ff_asf_content_encryption)) {
00581                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00582                 } else if (!guidcmp(&g, &ff_asf_ext_content_encryption)) {
00583                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00584                 } else if (!guidcmp(&g, &ff_asf_digital_signature)) {
00585                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
00586                 }
00587             }
00588         }
00589         if(url_ftell(pb) != gpos + gsize)
00590             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
00591         url_fseek(pb, gpos + gsize, SEEK_SET);
00592     }
00593     get_guid(pb, &g);
00594     get_le64(pb);
00595     get_byte(pb);
00596     get_byte(pb);
00597     if (url_feof(pb))
00598         return -1;
00599     asf->data_offset = url_ftell(pb);
00600     asf->packet_size_left = 0;
00601 
00602 
00603     for(i=0; i<128; i++){
00604         int stream_num= asf->asfid2avid[i];
00605         if(stream_num>=0){
00606             AVStream *st = s->streams[stream_num];
00607             if (!st->codec->bit_rate)
00608                 st->codec->bit_rate = bitrate[i];
00609             if (dar[i].num > 0 && dar[i].den > 0)
00610                 av_reduce(&st->sample_aspect_ratio.num,
00611                           &st->sample_aspect_ratio.den,
00612                           dar[i].num, dar[i].den, INT_MAX);
00613 //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);
00614 
00615             // copy and convert language codes to the frontend
00616             if (asf->streams[i].stream_language_index < 128) {
00617                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00618                 if (rfc1766 && strlen(rfc1766) > 1) {
00619                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00620                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00621                     if (iso6392)
00622                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
00623                 }
00624             }
00625         }
00626     }
00627 
00628     return 0;
00629 }
00630 
00631 #define DO_2BITS(bits, var, defval) \
00632     switch (bits & 3) \
00633     { \
00634     case 3: var = get_le32(pb); rsize += 4; break; \
00635     case 2: var = get_le16(pb); rsize += 2; break; \
00636     case 1: var = get_byte(pb); rsize++; break; \
00637     default: var = defval; break; \
00638     }
00639 
00646 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
00647 {
00648     ASFContext *asf = s->priv_data;
00649     uint32_t packet_length, padsize;
00650     int rsize = 8;
00651     int c, d, e, off;
00652 
00653     // if we do not know packet size, allow skipping up to 32 kB
00654     off= 32768;
00655     if (s->packet_size > 0)
00656         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
00657 
00658     c=d=e=-1;
00659     while(off-- > 0){
00660         c=d; d=e;
00661         e= get_byte(pb);
00662         if(c == 0x82 && !d && !e)
00663             break;
00664     }
00665 
00666     if (c != 0x82) {
00673         if (url_ferror(pb) == AVERROR(EAGAIN))
00674             return AVERROR(EAGAIN);
00675         if (!url_feof(pb))
00676             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
00677     }
00678     if ((c & 0x8f) == 0x82) {
00679         if (d || e) {
00680             if (!url_feof(pb))
00681                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00682             return -1;
00683         }
00684         c= get_byte(pb);
00685         d= get_byte(pb);
00686         rsize+=3;
00687     }else{
00688         url_fseek(pb, -1, SEEK_CUR); //FIXME
00689     }
00690 
00691     asf->packet_flags    = c;
00692     asf->packet_property = d;
00693 
00694     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00695     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00696     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00697 
00698     //the following checks prevent overflows and infinite loops
00699     if(!packet_length || packet_length >= (1U<<29)){
00700         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
00701         return -1;
00702     }
00703     if(padsize >= packet_length){
00704         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
00705         return -1;
00706     }
00707 
00708     asf->packet_timestamp = get_le32(pb);
00709     get_le16(pb); /* duration */
00710     // rsize has at least 11 bytes which have to be present
00711 
00712     if (asf->packet_flags & 0x01) {
00713         asf->packet_segsizetype = get_byte(pb); rsize++;
00714         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00715     } else {
00716         asf->packet_segments = 1;
00717         asf->packet_segsizetype = 0x80;
00718     }
00719     asf->packet_size_left = packet_length - padsize - rsize;
00720     if (packet_length < asf->hdr.min_pktsize)
00721         padsize += asf->hdr.min_pktsize - packet_length;
00722     asf->packet_padsize = padsize;
00723     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00724     return 0;
00725 }
00726 
00731 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
00732     ASFContext *asf = s->priv_data;
00733     int rsize = 1;
00734     int num = get_byte(pb);
00735     int64_t ts0, ts1;
00736 
00737     asf->packet_segments--;
00738     asf->packet_key_frame = num >> 7;
00739     asf->stream_index = asf->asfid2avid[num & 0x7f];
00740     // sequence should be ignored!
00741     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00742     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00743     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00744 //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);
00745     if (asf->packet_replic_size >= 8) {
00746         asf->packet_obj_size = get_le32(pb);
00747         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00748             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00749             return -1;
00750         }
00751         asf->packet_frag_timestamp = get_le32(pb); // timestamp
00752         if(asf->packet_replic_size >= 8+38+4){
00753 //            for(i=0; i<asf->packet_replic_size-8; i++)
00754 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
00755 //            av_log(s, AV_LOG_DEBUG, "\n");
00756             url_fskip(pb, 10);
00757             ts0= get_le64(pb);
00758             ts1= get_le64(pb);
00759             url_fskip(pb, 12);
00760             get_le32(pb);
00761             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
00762             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00763             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00764         }else
00765             url_fskip(pb, asf->packet_replic_size - 8);
00766         rsize += asf->packet_replic_size; // FIXME - check validity
00767     } else if (asf->packet_replic_size==1){
00768         // multipacket - frag_offset is beginning timestamp
00769         asf->packet_time_start = asf->packet_frag_offset;
00770         asf->packet_frag_offset = 0;
00771         asf->packet_frag_timestamp = asf->packet_timestamp;
00772 
00773         asf->packet_time_delta = get_byte(pb);
00774         rsize++;
00775     }else if(asf->packet_replic_size!=0){
00776         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00777         return -1;
00778     }
00779     if (asf->packet_flags & 0x01) {
00780         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00781         if(asf->packet_frag_size > asf->packet_size_left - rsize){
00782             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
00783             return -1;
00784         }
00785         //printf("Fragsize %d\n", asf->packet_frag_size);
00786     } else {
00787         asf->packet_frag_size = asf->packet_size_left - rsize;
00788         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00789     }
00790     if (asf->packet_replic_size == 1) {
00791         asf->packet_multi_size = asf->packet_frag_size;
00792         if (asf->packet_multi_size > asf->packet_size_left)
00793             return -1;
00794     }
00795     asf->packet_size_left -= rsize;
00796     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00797 
00798     return 0;
00799 }
00800 
00810 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
00811 {
00812     ASFContext *asf = s->priv_data;
00813     ASFStream *asf_st = 0;
00814     for (;;) {
00815         if(url_feof(pb))
00816             return AVERROR_EOF;
00817         if (asf->packet_size_left < FRAME_HEADER_SIZE
00818             || asf->packet_segments < 1) {
00819             //asf->packet_size_left <= asf->packet_padsize) {
00820             int ret = asf->packet_size_left + asf->packet_padsize;
00821             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
00822             assert(ret>=0);
00823             /* fail safe */
00824             url_fskip(pb, ret);
00825 
00826             asf->packet_pos= url_ftell(pb);
00827             if (asf->data_object_size != (uint64_t)-1 &&
00828                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00829                 return AVERROR_EOF; /* Do not exceed the size of the data object */
00830             return 1;
00831         }
00832         if (asf->packet_time_start == 0) {
00833             if(asf_read_frame_header(s, pb) < 0){
00834                 asf->packet_segments= 0;
00835                 continue;
00836             }
00837             if (asf->stream_index < 0
00838                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00839                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00840                 ) {
00841                 asf->packet_time_start = 0;
00842                 /* unhandled packet (should not happen) */
00843                 url_fskip(pb, asf->packet_frag_size);
00844                 asf->packet_size_left -= asf->packet_frag_size;
00845                 if(asf->stream_index < 0)
00846                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00847                 continue;
00848             }
00849             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00850         }
00851         asf_st = asf->asf_st;
00852 
00853         if (asf->packet_replic_size == 1) {
00854             // frag_offset is here used as the beginning timestamp
00855             asf->packet_frag_timestamp = asf->packet_time_start;
00856             asf->packet_time_start += asf->packet_time_delta;
00857             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
00858             asf->packet_size_left--;
00859             asf->packet_multi_size--;
00860             if (asf->packet_multi_size < asf->packet_obj_size)
00861             {
00862                 asf->packet_time_start = 0;
00863                 url_fskip(pb, asf->packet_multi_size);
00864                 asf->packet_size_left -= asf->packet_multi_size;
00865                 continue;
00866             }
00867             asf->packet_multi_size -= asf->packet_obj_size;
00868             //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);
00869         }
00870         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00871               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00872            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00873             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00874                 asf_st->frag_offset, asf->packet_frag_size,
00875                 asf->packet_obj_size, asf_st->pkt.size);
00876             asf->packet_obj_size= asf_st->pkt.size;
00877         }
00878 
00879         if (   asf_st->pkt.size != asf->packet_obj_size
00880             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00881             if(asf_st->pkt.data){
00882                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00883                 asf_st->frag_offset = 0;
00884                 av_free_packet(&asf_st->pkt);
00885             }
00886             /* new packet */
00887             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00888             asf_st->seq = asf->packet_seq;
00889             asf_st->pkt.dts = asf->packet_frag_timestamp;
00890             asf_st->pkt.stream_index = asf->stream_index;
00891             asf_st->pkt.pos =
00892             asf_st->packet_pos= asf->packet_pos;
00893 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
00894 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
00895 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
00896             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
00897                 asf->packet_key_frame = 1;
00898             if (asf->packet_key_frame)
00899                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
00900         }
00901 
00902         /* read data */
00903         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
00904         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
00905         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
00906         asf->packet_size_left -= asf->packet_frag_size;
00907         if (asf->packet_size_left < 0)
00908             continue;
00909 
00910         if(   asf->packet_frag_offset >= asf_st->pkt.size
00911            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
00912             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
00913                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
00914             continue;
00915         }
00916 
00917         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
00918                    asf->packet_frag_size);
00919         if (s->key && s->keylen == 20)
00920             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
00921                             asf->packet_frag_size);
00922         asf_st->frag_offset += asf->packet_frag_size;
00923         /* test if whole packet is read */
00924         if (asf_st->frag_offset == asf_st->pkt.size) {
00925             //workaround for macroshit radio DVR-MS files
00926             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
00927                && asf_st->pkt.size > 100){
00928                 int i;
00929                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
00930                 if(i == asf_st->pkt.size){
00931                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
00932                     asf_st->frag_offset = 0;
00933                     av_free_packet(&asf_st->pkt);
00934                     continue;
00935                 }
00936             }
00937 
00938             /* return packet */
00939             if (asf_st->ds_span > 1) {
00940               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
00941                     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);
00942               }else{
00943                 /* packet descrambling */
00944                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
00945                 if (newdata) {
00946                     int offset = 0;
00947                     while (offset < asf_st->pkt.size) {
00948                         int off = offset / asf_st->ds_chunk_size;
00949                         int row = off / asf_st->ds_span;
00950                         int col = off % asf_st->ds_span;
00951                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
00952                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
00953 
00954                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
00955                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
00956                         memcpy(newdata + offset,
00957                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
00958                                asf_st->ds_chunk_size);
00959                         offset += asf_st->ds_chunk_size;
00960                     }
00961                     av_free(asf_st->pkt.data);
00962                     asf_st->pkt.data = newdata;
00963                 }
00964               }
00965             }
00966             asf_st->frag_offset = 0;
00967             *pkt= asf_st->pkt;
00968             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
00969             asf_st->pkt.size = 0;
00970             asf_st->pkt.data = 0;
00971             break; // packet completed
00972         }
00973     }
00974     return 0;
00975 }
00976 
00977 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
00978 {
00979     ASFContext *asf = s->priv_data;
00980 
00981     for (;;) {
00982         int ret;
00983 
00984         /* parse cached packets, if any */
00985         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
00986             return ret;
00987         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
00988             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
00989         asf->packet_time_start = 0;
00990     }
00991 
00992     return 0;
00993 }
00994 
00995 // Added to support seeking after packets have been read
00996 // If information is not reset, read_packet fails due to
00997 // leftover information from previous reads
00998 static void asf_reset_header(AVFormatContext *s)
00999 {
01000     ASFContext *asf = s->priv_data;
01001     ASFStream *asf_st;
01002     int i;
01003 
01004     asf->packet_nb_frames = 0;
01005     asf->packet_size_left = 0;
01006     asf->packet_segments = 0;
01007     asf->packet_flags = 0;
01008     asf->packet_property = 0;
01009     asf->packet_timestamp = 0;
01010     asf->packet_segsizetype = 0;
01011     asf->packet_segments = 0;
01012     asf->packet_seq = 0;
01013     asf->packet_replic_size = 0;
01014     asf->packet_key_frame = 0;
01015     asf->packet_padsize = 0;
01016     asf->packet_frag_offset = 0;
01017     asf->packet_frag_size = 0;
01018     asf->packet_frag_timestamp = 0;
01019     asf->packet_multi_size = 0;
01020     asf->packet_obj_size = 0;
01021     asf->packet_time_delta = 0;
01022     asf->packet_time_start = 0;
01023 
01024     for(i=0; i<s->nb_streams; i++){
01025         asf_st= s->streams[i]->priv_data;
01026         av_free_packet(&asf_st->pkt);
01027         asf_st->frag_offset=0;
01028         asf_st->seq=0;
01029     }
01030     asf->asf_st= NULL;
01031 }
01032 
01033 static int asf_read_close(AVFormatContext *s)
01034 {
01035     int i;
01036 
01037     asf_reset_header(s);
01038     for(i=0;i<s->nb_streams;i++) {
01039         AVStream *st = s->streams[i];
01040         av_free(st->codec->palctrl);
01041     }
01042     return 0;
01043 }
01044 
01045 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01046 {
01047     AVPacket pkt1, *pkt = &pkt1;
01048     ASFStream *asf_st;
01049     int64_t pts;
01050     int64_t pos= *ppos;
01051     int i;
01052     int64_t start_pos[s->nb_streams];
01053 
01054     for(i=0; i<s->nb_streams; i++){
01055         start_pos[i]= pos;
01056     }
01057 
01058     if (s->packet_size > 0)
01059         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01060     *ppos= pos;
01061     url_fseek(s->pb, pos, SEEK_SET);
01062 
01063 //printf("asf_read_pts\n");
01064     asf_reset_header(s);
01065     for(;;){
01066         if (av_read_frame(s, pkt) < 0){
01067             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01068             return AV_NOPTS_VALUE;
01069         }
01070 
01071         pts= pkt->pts;
01072 
01073         av_free_packet(pkt);
01074         if(pkt->flags&AV_PKT_FLAG_KEY){
01075             i= pkt->stream_index;
01076 
01077             asf_st= s->streams[i]->priv_data;
01078 
01079 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01080             pos= asf_st->packet_pos;
01081 
01082             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01083             start_pos[i]= asf_st->packet_pos + 1;
01084 
01085             if(pkt->stream_index == stream_index)
01086                break;
01087         }
01088     }
01089 
01090     *ppos= pos;
01091 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01092 
01093     return pts;
01094 }
01095 
01096 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01097 {
01098     ff_asf_guid g;
01099     ASFContext *asf = s->priv_data;
01100     int64_t current_pos= url_ftell(s->pb);
01101     int i;
01102 
01103     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
01104     get_guid(s->pb, &g);
01105     if (!guidcmp(&g, &index_guid)) {
01106         int64_t itime, last_pos=-1;
01107         int pct, ict;
01108         int64_t av_unused gsize= get_le64(s->pb);
01109         get_guid(s->pb, &g);
01110         itime=get_le64(s->pb);
01111         pct=get_le32(s->pb);
01112         ict=get_le32(s->pb);
01113         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01114 
01115         for (i=0;i<ict;i++){
01116             int pktnum=get_le32(s->pb);
01117             int pktct =get_le16(s->pb);
01118             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01119             int64_t index_pts= av_rescale(itime, i, 10000);
01120 
01121             if(pos != last_pos){
01122             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
01123             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01124             last_pos=pos;
01125             }
01126         }
01127         asf->index_read= 1;
01128     }
01129     url_fseek(s->pb, current_pos, SEEK_SET);
01130 }
01131 
01132 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01133 {
01134     ASFContext *asf = s->priv_data;
01135     AVStream *st = s->streams[stream_index];
01136     int64_t pos;
01137     int index;
01138 
01139     if (s->packet_size <= 0)
01140         return -1;
01141 
01142     /* Try using the protocol's read_seek if available */
01143     if(s->pb) {
01144         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
01145         if(ret >= 0)
01146             asf_reset_header(s);
01147         if (ret != AVERROR(ENOSYS))
01148             return ret;
01149     }
01150 
01151     if (!asf->index_read)
01152         asf_build_simple_index(s, stream_index);
01153 
01154     if(!(asf->index_read && st->index_entries)){
01155         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
01156             return -1;
01157     }else{
01158         index= av_index_search_timestamp(st, pts, flags);
01159         if(index<0)
01160             return -1;
01161 
01162         /* find the position */
01163         pos = st->index_entries[index].pos;
01164 
01165     // various attempts to find key frame have failed so far
01166     //    asf_reset_header(s);
01167     //    url_fseek(s->pb, pos, SEEK_SET);
01168     //    key_pos = pos;
01169     //     for(i=0;i<16;i++){
01170     //         pos = url_ftell(s->pb);
01171     //         if (av_read_frame(s, &pkt) < 0){
01172     //             av_log(s, AV_LOG_INFO, "seek failed\n");
01173     //             return -1;
01174     //         }
01175     //         asf_st = s->streams[stream_index]->priv_data;
01176     //         pos += st->parser->frame_offset;
01177     //
01178     //         if (pkt.size > b) {
01179     //             b = pkt.size;
01180     //             key_pos = pos;
01181     //         }
01182     //
01183     //         av_free_packet(&pkt);
01184     //     }
01185 
01186         /* do the seek */
01187         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01188         url_fseek(s->pb, pos, SEEK_SET);
01189     }
01190     asf_reset_header(s);
01191     return 0;
01192 }
01193 
01194 AVInputFormat asf_demuxer = {
01195     "asf",
01196     NULL_IF_CONFIG_SMALL("ASF format"),
01197     sizeof(ASFContext),
01198     asf_probe,
01199     asf_read_header,
01200     asf_read_packet,
01201     asf_read_close,
01202     asf_read_seek,
01203     asf_read_pts,
01204     .metadata_conv = ff_asf_metadata_conv,
01205 };