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 #include "libavutil/common.h"
00023 #include "libavcodec/mpegaudio.h"
00024 #include "avformat.h"
00025 #include "riff.h"
00026 #include "asf.h"
00027 #include "asfcrypt.h"
00028 
00029 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
00030 
00031 #undef NDEBUG
00032 #include <assert.h>
00033 
00034 #define FRAME_HEADER_SIZE 17
00035 // Fix Me! FRAME_HEADER_SIZE may be different.
00036 
00037 static const GUID index_guid = {
00038     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
00039 };
00040 
00041 static const GUID stream_bitrate_guid = { /* (http://get.to/sdp) */
00042     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
00043 };
00044 /**********************************/
00045 /* decoding */
00046 
00047 //#define DEBUG
00048 
00049 #ifdef DEBUG
00050 #define PRINT_IF_GUID(g,cmp) \
00051 if (!memcmp(g, &cmp, sizeof(GUID))) \
00052     dprintf(NULL, "(GUID: %s) ", #cmp)
00053 
00054 static void print_guid(const GUID *g)
00055 {
00056     int i;
00057     PRINT_IF_GUID(g, ff_asf_header);
00058     else PRINT_IF_GUID(g, ff_asf_file_header);
00059     else PRINT_IF_GUID(g, ff_asf_stream_header);
00060     else PRINT_IF_GUID(g, ff_asf_audio_stream);
00061     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
00062     else PRINT_IF_GUID(g, ff_asf_video_stream);
00063     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
00064     else PRINT_IF_GUID(g, ff_asf_command_stream);
00065     else PRINT_IF_GUID(g, ff_asf_comment_header);
00066     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
00067     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
00068     else PRINT_IF_GUID(g, ff_asf_data_header);
00069     else PRINT_IF_GUID(g, index_guid);
00070     else PRINT_IF_GUID(g, ff_asf_head1_guid);
00071     else PRINT_IF_GUID(g, ff_asf_head2_guid);
00072     else PRINT_IF_GUID(g, ff_asf_my_guid);
00073     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
00074     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
00075     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
00076     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
00077     else PRINT_IF_GUID(g, ff_asf_metadata_header);
00078     else PRINT_IF_GUID(g, stream_bitrate_guid);
00079     else
00080         dprintf(NULL, "(GUID: unknown) ");
00081     for(i=0;i<16;i++)
00082         dprintf(NULL, " 0x%02x,", (*g)[i]);
00083     dprintf(NULL, "}\n");
00084 }
00085 #undef PRINT_IF_GUID
00086 #else
00087 #define print_guid(g)
00088 #endif
00089 
00090 static void get_guid(ByteIOContext *s, GUID *g)
00091 {
00092     assert(sizeof(*g) == 16);
00093     get_buffer(s, *g, sizeof(*g));
00094 }
00095 
00096 #if 0
00097 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
00098 {
00099     int len, c;
00100     char *q;
00101 
00102     len = get_le16(pb);
00103     q = buf;
00104     while (len > 0) {
00105         c = get_le16(pb);
00106         if ((q - buf) < buf_size - 1)
00107             *q++ = c;
00108         len--;
00109     }
00110     *q = '\0';
00111 }
00112 #endif
00113 
00114 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
00115 {
00116     char* q = buf;
00117     len /= 2;
00118     while (len--) {
00119         uint8_t tmp;
00120         PUT_UTF8(get_le16(pb), tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
00121     }
00122     *q = '\0';
00123 }
00124 
00125 static int asf_probe(AVProbeData *pd)
00126 {
00127     /* check file header */
00128     if (!memcmp(pd->buf, &ff_asf_header, sizeof(GUID)))
00129         return AVPROBE_SCORE_MAX;
00130     else
00131         return 0;
00132 }
00133 
00134 static int get_value(ByteIOContext *pb, int type){
00135     switch(type){
00136         case 2: return get_le32(pb);
00137         case 3: return get_le32(pb);
00138         case 4: return get_le64(pb);
00139         case 5: return get_le16(pb);
00140         default:return INT_MIN;
00141     }
00142 }
00143 
00144 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
00145 {
00146     char value[1024];
00147     if (type <= 1) {         // unicode or byte
00148         get_str16_nolen(s->pb, len, value, sizeof(value));
00149     } else if (type <= 5) {  // boolean or DWORD or QWORD or WORD
00150         uint64_t num = get_value(s->pb, type);
00151         snprintf(value, sizeof(value), "%"PRIu64, num);
00152     } else {
00153         url_fskip(s->pb, len);
00154         return;
00155     }
00156     if (strncmp(key, "WM/", 3))
00157         key += 3;
00158     av_metadata_set(&s->metadata, key, value);
00159 }
00160 
00161 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
00162 {
00163     ASFContext *asf = s->priv_data;
00164     GUID g;
00165     ByteIOContext *pb = s->pb;
00166     AVStream *st;
00167     ASFStream *asf_st;
00168     int size, i;
00169     int64_t gsize;
00170     AVRational dar[128];
00171     uint32_t bitrate[128];
00172 
00173     memset(dar, 0, sizeof(dar));
00174     memset(bitrate, 0, sizeof(bitrate));
00175 
00176     get_guid(pb, &g);
00177     if (memcmp(&g, &ff_asf_header, sizeof(GUID)))
00178         return -1;
00179     get_le64(pb);
00180     get_le32(pb);
00181     get_byte(pb);
00182     get_byte(pb);
00183     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00184     for(;;) {
00185         get_guid(pb, &g);
00186         gsize = get_le64(pb);
00187         dprintf(s, "%08"PRIx64": ", url_ftell(pb) - 24);
00188         print_guid(&g);
00189         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
00190         if (!memcmp(&g, &ff_asf_data_header, sizeof(GUID))) {
00191             asf->data_object_offset = url_ftell(pb);
00192             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00193             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00194                 asf->data_object_size = gsize - 24;
00195             } else {
00196                 asf->data_object_size = (uint64_t)-1;
00197             }
00198             break;
00199         }
00200         if (gsize < 24)
00201             return -1;
00202         if (!memcmp(&g, &ff_asf_file_header, sizeof(GUID))) {
00203             get_guid(pb, &asf->hdr.guid);
00204             asf->hdr.file_size          = get_le64(pb);
00205             asf->hdr.create_time        = get_le64(pb);
00206             asf->nb_packets             = get_le64(pb);
00207             asf->hdr.play_time          = get_le64(pb);
00208             asf->hdr.send_time          = get_le64(pb);
00209             asf->hdr.preroll            = get_le32(pb);
00210             asf->hdr.ignore             = get_le32(pb);
00211             asf->hdr.flags              = get_le32(pb);
00212             asf->hdr.min_pktsize        = get_le32(pb);
00213             asf->hdr.max_pktsize        = get_le32(pb);
00214             asf->hdr.max_bitrate        = get_le32(pb);
00215             s->packet_size = asf->hdr.max_pktsize;
00216         } else if (!memcmp(&g, &ff_asf_stream_header, sizeof(GUID))) {
00217             enum CodecType type;
00218             int type_specific_size, sizeX;
00219             uint64_t total_size;
00220             unsigned int tag1;
00221             int64_t pos1, pos2, start_time;
00222             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
00223 
00224             pos1 = url_ftell(pb);
00225 
00226             st = av_new_stream(s, 0);
00227             if (!st)
00228                 return AVERROR(ENOMEM);
00229             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00230             asf_st = av_mallocz(sizeof(ASFStream));
00231             if (!asf_st)
00232                 return AVERROR(ENOMEM);
00233             st->priv_data = asf_st;
00234             start_time = asf->hdr.preroll;
00235 
00236             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00237                 st->duration = asf->hdr.send_time /
00238                     (10000000 / 1000) - start_time;
00239             }
00240             get_guid(pb, &g);
00241 
00242             test_for_ext_stream_audio = 0;
00243             if (!memcmp(&g, &ff_asf_audio_stream, sizeof(GUID))) {
00244                 type = CODEC_TYPE_AUDIO;
00245             } else if (!memcmp(&g, &ff_asf_video_stream, sizeof(GUID))) {
00246                 type = CODEC_TYPE_VIDEO;
00247             } else if (!memcmp(&g, &ff_asf_command_stream, sizeof(GUID))) {
00248                 type = CODEC_TYPE_DATA;
00249             } else if (!memcmp(&g, &ff_asf_ext_stream_embed_stream_header, sizeof(GUID))) {
00250                 test_for_ext_stream_audio = 1;
00251                 type = CODEC_TYPE_UNKNOWN;
00252             } else {
00253                 return -1;
00254             }
00255             get_guid(pb, &g);
00256             total_size = get_le64(pb);
00257             type_specific_size = get_le32(pb);
00258             get_le32(pb);
00259             st->id = get_le16(pb) & 0x7f; /* stream id */
00260             // mapping of asf ID to AV stream ID;
00261             asf->asfid2avid[st->id] = s->nb_streams - 1;
00262 
00263             get_le32(pb);
00264 
00265             if (test_for_ext_stream_audio) {
00266                 get_guid(pb, &g);
00267                 if (!memcmp(&g, &ff_asf_ext_stream_audio_stream, sizeof(GUID))) {
00268                     type = CODEC_TYPE_AUDIO;
00269                     is_dvr_ms_audio=1;
00270                     get_guid(pb, &g);
00271                     get_le32(pb);
00272                     get_le32(pb);
00273                     get_le32(pb);
00274                     get_guid(pb, &g);
00275                     get_le32(pb);
00276                 }
00277             }
00278 
00279             st->codec->codec_type = type;
00280             if (type == CODEC_TYPE_AUDIO) {
00281                 get_wav_header(pb, st->codec, type_specific_size);
00282                 if (is_dvr_ms_audio) {
00283                     // codec_id and codec_tag are unreliable in dvr_ms
00284                     // files. Set them later by probing stream.
00285                     st->codec->codec_id = CODEC_ID_PROBE;
00286                     st->codec->codec_tag = 0;
00287                 }
00288                 if (st->codec->codec_id == CODEC_ID_AAC) {
00289                     st->need_parsing = AVSTREAM_PARSE_NONE;
00290                 } else {
00291                     st->need_parsing = AVSTREAM_PARSE_FULL;
00292                 }
00293                 /* We have to init the frame size at some point .... */
00294                 pos2 = url_ftell(pb);
00295                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
00296                     asf_st->ds_span = get_byte(pb);
00297                     asf_st->ds_packet_size = get_le16(pb);
00298                     asf_st->ds_chunk_size = get_le16(pb);
00299                     get_le16(pb); //ds_data_size
00300                     get_byte(pb); //ds_silence_data
00301                 }
00302                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
00303                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
00304                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
00305                 if (asf_st->ds_span > 1) {
00306                     if (!asf_st->ds_chunk_size
00307                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00308                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00309                         asf_st->ds_span = 0; // disable descrambling
00310                 }
00311                 switch (st->codec->codec_id) {
00312                 case CODEC_ID_MP3:
00313                     st->codec->frame_size = MPA_FRAME_SIZE;
00314                     break;
00315                 case CODEC_ID_PCM_S16LE:
00316                 case CODEC_ID_PCM_S16BE:
00317                 case CODEC_ID_PCM_U16LE:
00318                 case CODEC_ID_PCM_U16BE:
00319                 case CODEC_ID_PCM_S8:
00320                 case CODEC_ID_PCM_U8:
00321                 case CODEC_ID_PCM_ALAW:
00322                 case CODEC_ID_PCM_MULAW:
00323                     st->codec->frame_size = 1;
00324                     break;
00325                 default:
00326                     /* This is probably wrong, but it prevents a crash later */
00327                     st->codec->frame_size = 1;
00328                     break;
00329                 }
00330             } else if (type == CODEC_TYPE_VIDEO) {
00331                 get_le32(pb);
00332                 get_le32(pb);
00333                 get_byte(pb);
00334                 size = get_le16(pb); /* size */
00335                 sizeX= get_le32(pb); /* size */
00336                 st->codec->width = get_le32(pb);
00337                 st->codec->height = get_le32(pb);
00338                 /* not available for asf */
00339                 get_le16(pb); /* panes */
00340                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
00341                 tag1 = get_le32(pb);
00342                 url_fskip(pb, 20);
00343 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
00344                 size= sizeX;
00345                 if (size > 40) {
00346                     st->codec->extradata_size = size - 40;
00347                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00348                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
00349                 }
00350 
00351         /* Extract palette from extradata if bpp <= 8 */
00352         /* This code assumes that extradata contains only palette */
00353         /* This is true for all paletted codecs implemented in ffmpeg */
00354         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00355             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
00356 #ifdef WORDS_BIGENDIAN
00357             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00358                 st->codec->palctrl->palette[i] = bswap_32(((uint32_t*)st->codec->extradata)[i]);
00359 #else
00360             memcpy(st->codec->palctrl->palette, st->codec->extradata,
00361                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00362 #endif
00363             st->codec->palctrl->palette_changed = 1;
00364         }
00365 
00366                 st->codec->codec_tag = tag1;
00367                 st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1);
00368                 if(tag1 == MKTAG('D', 'V', 'R', ' '))
00369                     st->need_parsing = AVSTREAM_PARSE_FULL;
00370             }
00371             pos2 = url_ftell(pb);
00372             url_fskip(pb, gsize - (pos2 - pos1 + 24));
00373         } else if (!memcmp(&g, &ff_asf_comment_header, sizeof(GUID))) {
00374             int len1, len2, len3, len4, len5;
00375 
00376             len1 = get_le16(pb);
00377             len2 = get_le16(pb);
00378             len3 = get_le16(pb);
00379             len4 = get_le16(pb);
00380             len5 = get_le16(pb);
00381             get_tag(s, "title"    , 0, len1);
00382             get_tag(s, "author"   , 0, len2);
00383             get_tag(s, "copyright", 0, len3);
00384             get_tag(s, "comment"  , 0, len4);
00385             url_fskip(pb, len5);
00386         } else if (!memcmp(&g, &stream_bitrate_guid, sizeof(GUID))) {
00387             int stream_count = get_le16(pb);
00388             int j;
00389 
00390 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
00391 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
00392             for(j = 0; j < stream_count; j++) {
00393                 int flags, bitrate, stream_id;
00394 
00395                 flags= get_le16(pb);
00396                 bitrate= get_le32(pb);
00397                 stream_id= (flags & 0x7f);
00398 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
00399                 asf->stream_bitrates[stream_id]= bitrate;
00400             }
00401        } else if (!memcmp(&g, &ff_asf_extended_content_header, sizeof(GUID))) {
00402                 int desc_count, i;
00403 
00404                 desc_count = get_le16(pb);
00405                 for(i=0;i<desc_count;i++)
00406                 {
00407                         int name_len,value_type,value_len;
00408                         char name[1024];
00409 
00410                         name_len = get_le16(pb);
00411                         get_str16_nolen(pb, name_len, name, sizeof(name));
00412                         value_type = get_le16(pb);
00413                         value_len = get_le16(pb);
00414                         get_tag(s, name, value_type, value_len);
00415                 }
00416         } else if (!memcmp(&g, &ff_asf_metadata_header, sizeof(GUID))) {
00417             int n, stream_num, name_len, value_len, value_type, value_num;
00418             n = get_le16(pb);
00419 
00420             for(i=0;i<n;i++) {
00421                 char name[1024];
00422 
00423                 get_le16(pb); //lang_list_index
00424                 stream_num= get_le16(pb);
00425                 name_len=   get_le16(pb);
00426                 value_type= get_le16(pb);
00427                 value_len=  get_le32(pb);
00428 
00429                 get_str16_nolen(pb, name_len, name, sizeof(name));
00430 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
00431                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00432                 url_fskip(pb, value_len - 2);
00433 
00434                 if(stream_num<128){
00435                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
00436                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
00437                 }
00438             }
00439         } else if (!memcmp(&g, &ff_asf_ext_stream_header, sizeof(GUID))) {
00440             int ext_len, payload_ext_ct, stream_ct;
00441             uint32_t ext_d, leak_rate, stream_num;
00442             int64_t pos_ex_st;
00443             pos_ex_st = url_ftell(pb);
00444 
00445             get_le64(pb); // starttime
00446             get_le64(pb); // endtime
00447             leak_rate = get_le32(pb); // leak-datarate
00448             get_le32(pb); // bucket-datasize
00449             get_le32(pb); // init-bucket-fullness
00450             get_le32(pb); // alt-leak-datarate
00451             get_le32(pb); // alt-bucket-datasize
00452             get_le32(pb); // alt-init-bucket-fullness
00453             get_le32(pb); // max-object-size
00454             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00455             stream_num = get_le16(pb); // stream-num
00456             get_le16(pb); // stream-language-id-index
00457             get_le64(pb); // avg frametime in 100ns units
00458             stream_ct = get_le16(pb); //stream-name-count
00459             payload_ext_ct = get_le16(pb); //payload-extension-system-count
00460 
00461             if (stream_num < 128)
00462                 bitrate[stream_num] = leak_rate;
00463 
00464             for (i=0; i<stream_ct; i++){
00465                 get_le16(pb);
00466                 ext_len = get_le16(pb);
00467                 url_fseek(pb, ext_len, SEEK_CUR);
00468             }
00469 
00470             for (i=0; i<payload_ext_ct; i++){
00471                 get_guid(pb, &g);
00472                 ext_d=get_le16(pb);
00473                 ext_len=get_le32(pb);
00474                 url_fseek(pb, ext_len, SEEK_CUR);
00475             }
00476 
00477             // there could be a optional stream properties object to follow
00478             // if so the next iteration will pick it up
00479         } else if (!memcmp(&g, &ff_asf_head1_guid, sizeof(GUID))) {
00480             int v1, v2;
00481             get_guid(pb, &g);
00482             v1 = get_le32(pb);
00483             v2 = get_le16(pb);
00484 #if 0
00485         } else if (!memcmp(&g, &ff_asf_codec_comment_header, sizeof(GUID))) {
00486             int len, v1, n, num;
00487             char str[256], *q;
00488             char tag[16];
00489 
00490             get_guid(pb, &g);
00491             print_guid(&g);
00492 
00493             n = get_le32(pb);
00494             for(i=0;i<n;i++) {
00495                 num = get_le16(pb); /* stream number */
00496                 get_str16(pb, str, sizeof(str));
00497                 get_str16(pb, str, sizeof(str));
00498                 len = get_le16(pb);
00499                 q = tag;
00500                 while (len > 0) {
00501                     v1 = get_byte(pb);
00502                     if ((q - tag) < sizeof(tag) - 1)
00503                         *q++ = v1;
00504                     len--;
00505                 }
00506                 *q = '\0';
00507             }
00508 #endif
00509         } else if (url_feof(pb)) {
00510             return -1;
00511         } else {
00512             url_fseek(pb, gsize - 24, SEEK_CUR);
00513         }
00514     }
00515     get_guid(pb, &g);
00516     get_le64(pb);
00517     get_byte(pb);
00518     get_byte(pb);
00519     if (url_feof(pb))
00520         return -1;
00521     asf->data_offset = url_ftell(pb);
00522     asf->packet_size_left = 0;
00523 
00524 
00525     for(i=0; i<128; i++){
00526         int stream_num= asf->asfid2avid[i];
00527         if(stream_num>=0){
00528             AVStream *st = s->streams[stream_num];
00529             if (!st->codec->bit_rate)
00530                 st->codec->bit_rate = bitrate[i];
00531             if (dar[i].num > 0 && dar[i].den > 0)
00532                 av_reduce(&st->sample_aspect_ratio.num,
00533                           &st->sample_aspect_ratio.den,
00534                           dar[i].num, dar[i].den, INT_MAX);
00535 //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);
00536         }
00537     }
00538 
00539     return 0;
00540 }
00541 
00542 #define DO_2BITS(bits, var, defval) \
00543     switch (bits & 3) \
00544     { \
00545     case 3: var = get_le32(pb); rsize += 4; break; \
00546     case 2: var = get_le16(pb); rsize += 2; break; \
00547     case 1: var = get_byte(pb); rsize++; break; \
00548     default: var = defval; break; \
00549     }
00550 
00551 int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
00552 {
00553     ASFContext *asf = s->priv_data;
00554     uint32_t packet_length, padsize;
00555     int rsize = 8;
00556     int c, d, e, off;
00557 
00558     off= 32768;
00559     if (s->packet_size > 0)
00560         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
00561 
00562     c=d=e=-1;
00563     while(off-- > 0){
00564         c=d; d=e;
00565         e= get_byte(pb);
00566         if(c == 0x82 && !d && !e)
00567             break;
00568     }
00569 
00570     if (c != 0x82) {
00571         if (!url_feof(pb))
00572             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
00573     }
00574     if ((c & 0x8f) == 0x82) {
00575         if (d || e) {
00576             if (!url_feof(pb))
00577                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00578             return -1;
00579         }
00580         c= get_byte(pb);
00581         d= get_byte(pb);
00582         rsize+=3;
00583     }else{
00584         url_fseek(pb, -1, SEEK_CUR); //FIXME
00585     }
00586 
00587     asf->packet_flags    = c;
00588     asf->packet_property = d;
00589 
00590     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00591     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00592     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00593 
00594     //the following checks prevent overflows and infinite loops
00595     if(!packet_length || packet_length >= (1U<<29)){
00596         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
00597         return -1;
00598     }
00599     if(padsize >= packet_length){
00600         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
00601         return -1;
00602     }
00603 
00604     asf->packet_timestamp = get_le32(pb);
00605     get_le16(pb); /* duration */
00606     // rsize has at least 11 bytes which have to be present
00607 
00608     if (asf->packet_flags & 0x01) {
00609         asf->packet_segsizetype = get_byte(pb); rsize++;
00610         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00611     } else {
00612         asf->packet_segments = 1;
00613         asf->packet_segsizetype = 0x80;
00614     }
00615     asf->packet_size_left = packet_length - padsize - rsize;
00616     if (packet_length < asf->hdr.min_pktsize)
00617         padsize += asf->hdr.min_pktsize - packet_length;
00618     asf->packet_padsize = padsize;
00619     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00620     return 0;
00621 }
00622 
00627 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
00628     ASFContext *asf = s->priv_data;
00629     int rsize = 1;
00630     int num = get_byte(pb);
00631     int64_t ts0, ts1;
00632 
00633     asf->packet_segments--;
00634     asf->packet_key_frame = num >> 7;
00635     asf->stream_index = asf->asfid2avid[num & 0x7f];
00636     // sequence should be ignored!
00637     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00638     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00639     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00640 //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);
00641     if (asf->packet_replic_size >= 8) {
00642         asf->packet_obj_size = get_le32(pb);
00643         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00644             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00645             return -1;
00646         }
00647         asf->packet_frag_timestamp = get_le32(pb); // timestamp
00648         if(asf->packet_replic_size >= 8+38+4){
00649 //            for(i=0; i<asf->packet_replic_size-8; i++)
00650 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
00651 //            av_log(s, AV_LOG_DEBUG, "\n");
00652             url_fskip(pb, 10);
00653             ts0= get_le64(pb);
00654             ts1= get_le64(pb);
00655             url_fskip(pb, 12);
00656             get_le32(pb);
00657             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
00658             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00659             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00660         }else
00661             url_fskip(pb, asf->packet_replic_size - 8);
00662         rsize += asf->packet_replic_size; // FIXME - check validity
00663     } else if (asf->packet_replic_size==1){
00664         // multipacket - frag_offset is beginning timestamp
00665         asf->packet_time_start = asf->packet_frag_offset;
00666         asf->packet_frag_offset = 0;
00667         asf->packet_frag_timestamp = asf->packet_timestamp;
00668 
00669         asf->packet_time_delta = get_byte(pb);
00670         rsize++;
00671     }else if(asf->packet_replic_size!=0){
00672         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00673         return -1;
00674     }
00675     if (asf->packet_flags & 0x01) {
00676         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00677         if(asf->packet_frag_size > asf->packet_size_left - rsize){
00678             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
00679             return -1;
00680         }
00681         //printf("Fragsize %d\n", asf->packet_frag_size);
00682     } else {
00683         asf->packet_frag_size = asf->packet_size_left - rsize;
00684         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00685     }
00686     if (asf->packet_replic_size == 1) {
00687         asf->packet_multi_size = asf->packet_frag_size;
00688         if (asf->packet_multi_size > asf->packet_size_left)
00689             return -1;
00690     }
00691     asf->packet_size_left -= rsize;
00692     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00693 
00694     return 0;
00695 }
00696 
00697 int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
00698 {
00699     ASFContext *asf = s->priv_data;
00700     ASFStream *asf_st = 0;
00701     for (;;) {
00702         if(url_feof(pb))
00703             return AVERROR(EIO);
00704         if (asf->packet_size_left < FRAME_HEADER_SIZE
00705             || asf->packet_segments < 1) {
00706             //asf->packet_size_left <= asf->packet_padsize) {
00707             int ret = asf->packet_size_left + asf->packet_padsize;
00708             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
00709             assert(ret>=0);
00710             /* fail safe */
00711             url_fskip(pb, ret);
00712 
00713             asf->packet_pos= url_ftell(pb);
00714             if (asf->data_object_size != (uint64_t)-1 &&
00715                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00716                 return AVERROR(EIO); /* Do not exceed the size of the data object */
00717             return 1;
00718         }
00719         if (asf->packet_time_start == 0) {
00720             if(asf_read_frame_header(s, pb) < 0){
00721                 asf->packet_segments= 0;
00722                 continue;
00723             }
00724             if (asf->stream_index < 0
00725                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00726                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00727                 ) {
00728                 asf->packet_time_start = 0;
00729                 /* unhandled packet (should not happen) */
00730                 url_fskip(pb, asf->packet_frag_size);
00731                 asf->packet_size_left -= asf->packet_frag_size;
00732                 if(asf->stream_index < 0)
00733                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00734                 continue;
00735             }
00736             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00737         }
00738         asf_st = asf->asf_st;
00739 
00740         if (asf->packet_replic_size == 1) {
00741             // frag_offset is here used as the beginning timestamp
00742             asf->packet_frag_timestamp = asf->packet_time_start;
00743             asf->packet_time_start += asf->packet_time_delta;
00744             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
00745             asf->packet_size_left--;
00746             asf->packet_multi_size--;
00747             if (asf->packet_multi_size < asf->packet_obj_size)
00748             {
00749                 asf->packet_time_start = 0;
00750                 url_fskip(pb, asf->packet_multi_size);
00751                 asf->packet_size_left -= asf->packet_multi_size;
00752                 continue;
00753             }
00754             asf->packet_multi_size -= asf->packet_obj_size;
00755             //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);
00756         }
00757         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00758               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00759            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00760             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00761                 asf_st->frag_offset, asf->packet_frag_size,
00762                 asf->packet_obj_size, asf_st->pkt.size);
00763             asf->packet_obj_size= asf_st->pkt.size;
00764         }
00765 
00766         if (   asf_st->pkt.size != asf->packet_obj_size
00767             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00768             if(asf_st->pkt.data){
00769                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00770                 asf_st->frag_offset = 0;
00771                 av_free_packet(&asf_st->pkt);
00772             }
00773             /* new packet */
00774             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00775             asf_st->seq = asf->packet_seq;
00776             asf_st->pkt.dts = asf->packet_frag_timestamp;
00777             asf_st->pkt.stream_index = asf->stream_index;
00778             asf_st->pkt.pos =
00779             asf_st->packet_pos= asf->packet_pos;
00780 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
00781 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
00782 //s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
00783             if (s->streams[asf->stream_index]->codec->codec_type == CODEC_TYPE_AUDIO)
00784                 asf->packet_key_frame = 1;
00785             if (asf->packet_key_frame)
00786                 asf_st->pkt.flags |= PKT_FLAG_KEY;
00787         }
00788 
00789         /* read data */
00790         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
00791         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
00792         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
00793         asf->packet_size_left -= asf->packet_frag_size;
00794         if (asf->packet_size_left < 0)
00795             continue;
00796 
00797         if(   asf->packet_frag_offset >= asf_st->pkt.size
00798            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
00799             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
00800                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
00801             continue;
00802         }
00803 
00804         get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
00805                    asf->packet_frag_size);
00806         if (s->key && s->keylen == 20)
00807             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
00808                             asf->packet_frag_size);
00809         asf_st->frag_offset += asf->packet_frag_size;
00810         /* test if whole packet is read */
00811         if (asf_st->frag_offset == asf_st->pkt.size) {
00812             //workaround for macroshit radio DVR-MS files
00813             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
00814                && asf_st->pkt.size > 100){
00815                 int i;
00816                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
00817                 if(i == asf_st->pkt.size){
00818                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
00819                     asf_st->frag_offset = 0;
00820                     av_free_packet(&asf_st->pkt);
00821                     continue;
00822                 }
00823             }
00824 
00825             /* return packet */
00826             if (asf_st->ds_span > 1) {
00827               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
00828                     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);
00829               }else{
00830                 /* packet descrambling */
00831                 uint8_t *newdata = av_malloc(asf_st->pkt.size);
00832                 if (newdata) {
00833                     int offset = 0;
00834                     while (offset < asf_st->pkt.size) {
00835                         int off = offset / asf_st->ds_chunk_size;
00836                         int row = off / asf_st->ds_span;
00837                         int col = off % asf_st->ds_span;
00838                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
00839                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
00840 
00841                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
00842                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
00843                         memcpy(newdata + offset,
00844                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
00845                                asf_st->ds_chunk_size);
00846                         offset += asf_st->ds_chunk_size;
00847                     }
00848                     av_free(asf_st->pkt.data);
00849                     asf_st->pkt.data = newdata;
00850                 }
00851               }
00852             }
00853             asf_st->frag_offset = 0;
00854             *pkt= asf_st->pkt;
00855             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
00856             asf_st->pkt.size = 0;
00857             asf_st->pkt.data = 0;
00858             break; // packet completed
00859         }
00860     }
00861     return 0;
00862 }
00863 
00864 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
00865 {
00866     ASFContext *asf = s->priv_data;
00867 
00868     for (;;) {
00869         int ret;
00870 
00871         /* parse cached packets, if any */
00872         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
00873             return ret;
00874         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
00875             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
00876         asf->packet_time_start = 0;
00877     }
00878 
00879     return 0;
00880 }
00881 
00882 // Added to support seeking after packets have been read
00883 // If information is not reset, read_packet fails due to
00884 // leftover information from previous reads
00885 static void asf_reset_header(AVFormatContext *s)
00886 {
00887     ASFContext *asf = s->priv_data;
00888     ASFStream *asf_st;
00889     int i;
00890 
00891     asf->packet_nb_frames = 0;
00892     asf->packet_size_left = 0;
00893     asf->packet_segments = 0;
00894     asf->packet_flags = 0;
00895     asf->packet_property = 0;
00896     asf->packet_timestamp = 0;
00897     asf->packet_segsizetype = 0;
00898     asf->packet_segments = 0;
00899     asf->packet_seq = 0;
00900     asf->packet_replic_size = 0;
00901     asf->packet_key_frame = 0;
00902     asf->packet_padsize = 0;
00903     asf->packet_frag_offset = 0;
00904     asf->packet_frag_size = 0;
00905     asf->packet_frag_timestamp = 0;
00906     asf->packet_multi_size = 0;
00907     asf->packet_obj_size = 0;
00908     asf->packet_time_delta = 0;
00909     asf->packet_time_start = 0;
00910 
00911     for(i=0; i<s->nb_streams; i++){
00912         asf_st= s->streams[i]->priv_data;
00913         av_free_packet(&asf_st->pkt);
00914         asf_st->frag_offset=0;
00915         asf_st->seq=0;
00916     }
00917     asf->asf_st= NULL;
00918 }
00919 
00920 static int asf_read_close(AVFormatContext *s)
00921 {
00922     int i;
00923 
00924     asf_reset_header(s);
00925     for(i=0;i<s->nb_streams;i++) {
00926         AVStream *st = s->streams[i];
00927         av_free(st->codec->palctrl);
00928     }
00929     return 0;
00930 }
00931 
00932 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
00933 {
00934     AVPacket pkt1, *pkt = &pkt1;
00935     ASFStream *asf_st;
00936     int64_t pts;
00937     int64_t pos= *ppos;
00938     int i;
00939     int64_t start_pos[s->nb_streams];
00940 
00941     for(i=0; i<s->nb_streams; i++){
00942         start_pos[i]= pos;
00943     }
00944 
00945     if (s->packet_size > 0)
00946         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
00947     *ppos= pos;
00948     url_fseek(s->pb, pos, SEEK_SET);
00949 
00950 //printf("asf_read_pts\n");
00951     asf_reset_header(s);
00952     for(;;){
00953         if (av_read_frame(s, pkt) < 0){
00954             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
00955             return AV_NOPTS_VALUE;
00956         }
00957 
00958         pts= pkt->pts;
00959 
00960         av_free_packet(pkt);
00961         if(pkt->flags&PKT_FLAG_KEY){
00962             i= pkt->stream_index;
00963 
00964             asf_st= s->streams[i]->priv_data;
00965 
00966 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
00967             pos= asf_st->packet_pos;
00968 
00969             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
00970             start_pos[i]= asf_st->packet_pos + 1;
00971 
00972             if(pkt->stream_index == stream_index)
00973                break;
00974         }
00975     }
00976 
00977     *ppos= pos;
00978 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
00979 
00980     return pts;
00981 }
00982 
00983 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
00984 {
00985     GUID g;
00986     ASFContext *asf = s->priv_data;
00987     int64_t gsize, itime;
00988     int64_t pos, current_pos, index_pts;
00989     int i;
00990     int pct,ict;
00991 
00992     current_pos = url_ftell(s->pb);
00993 
00994     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
00995     get_guid(s->pb, &g);
00996     if (!memcmp(&g, &index_guid, sizeof(GUID))) {
00997         gsize = get_le64(s->pb);
00998         get_guid(s->pb, &g);
00999         itime=get_le64(s->pb);
01000         pct=get_le32(s->pb);
01001         ict=get_le32(s->pb);
01002         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01003 
01004         for (i=0;i<ict;i++){
01005             int pktnum=get_le32(s->pb);
01006             int pktct =get_le16(s->pb);
01007             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
01008 
01009             pos=s->data_offset + s->packet_size*(int64_t)pktnum;
01010             index_pts=av_rescale(itime, i, 10000);
01011 
01012             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01013         }
01014         asf->index_read= 1;
01015     }
01016     url_fseek(s->pb, current_pos, SEEK_SET);
01017 }
01018 
01019 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01020 {
01021     ASFContext *asf = s->priv_data;
01022     AVStream *st = s->streams[stream_index];
01023     int64_t pos;
01024     int index;
01025 
01026     if (s->packet_size <= 0)
01027         return -1;
01028 
01029     /* Try using the protocol's read_seek if available */
01030     if(s->pb) {
01031         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
01032         if(ret >= 0)
01033             asf_reset_header(s);
01034         if (ret != AVERROR(ENOSYS))
01035             return ret;
01036     }
01037 
01038     if (!asf->index_read)
01039         asf_build_simple_index(s, stream_index);
01040 
01041     if(!(asf->index_read && st->index_entries)){
01042         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
01043             return -1;
01044     }else{
01045         index= av_index_search_timestamp(st, pts, flags);
01046         if(index<0)
01047             return -1;
01048 
01049         /* find the position */
01050         pos = st->index_entries[index].pos;
01051         pts = st->index_entries[index].timestamp;
01052 
01053     // various attempts to find key frame have failed so far
01054     //    asf_reset_header(s);
01055     //    url_fseek(s->pb, pos, SEEK_SET);
01056     //    key_pos = pos;
01057     //     for(i=0;i<16;i++){
01058     //         pos = url_ftell(s->pb);
01059     //         if (av_read_frame(s, &pkt) < 0){
01060     //             av_log(s, AV_LOG_INFO, "seek failed\n");
01061     //             return -1;
01062     //         }
01063     //         asf_st = s->streams[stream_index]->priv_data;
01064     //         pos += st->parser->frame_offset;
01065     //
01066     //         if (pkt.size > b) {
01067     //             b = pkt.size;
01068     //             key_pos = pos;
01069     //         }
01070     //
01071     //         av_free_packet(&pkt);
01072     //     }
01073 
01074         /* do the seek */
01075         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01076         url_fseek(s->pb, pos, SEEK_SET);
01077     }
01078     asf_reset_header(s);
01079     return 0;
01080 }
01081 
01082 AVInputFormat asf_demuxer = {
01083     "asf",
01084     NULL_IF_CONFIG_SMALL("ASF format"),
01085     sizeof(ASFContext),
01086     asf_probe,
01087     asf_read_header,
01088     asf_read_packet,
01089     asf_read_close,
01090     asf_read_seek,
01091     asf_read_pts,
01092     .metadata_conv = ff_asf_metadata_conv,
01093 };