Libav 0.7.1
libavformat/asfdec.c
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00001 /*
00002  * ASF compatible demuxer
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav 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  * Libav 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 Libav; 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/bswap.h"
00025 #include "libavutil/common.h"
00026 #include "libavutil/avstring.h"
00027 #include "libavutil/dict.h"
00028 #include "libavcodec/mpegaudio.h"
00029 #include "avformat.h"
00030 #include "avio_internal.h"
00031 #include "riff.h"
00032 #include "asf.h"
00033 #include "asfcrypt.h"
00034 #include "avlanguage.h"
00035 
00036 typedef struct {
00037     int asfid2avid[128];                 
00038     ASFStream streams[128];              
00039     uint32_t stream_bitrates[128];       
00040     AVRational dar[128];
00041     char stream_languages[128][6];       
00042     /* non streamed additonnal info */
00043     /* packet filling */
00044     int packet_size_left;
00045     /* only for reading */
00046     uint64_t data_offset;                
00047     uint64_t data_object_offset;         
00048     uint64_t data_object_size;           
00049     int index_read;
00050 
00051     ASFMainHeader hdr;
00052 
00053     int packet_flags;
00054     int packet_property;
00055     int packet_timestamp;
00056     int packet_segsizetype;
00057     int packet_segments;
00058     int packet_seq;
00059     int packet_replic_size;
00060     int packet_key_frame;
00061     int packet_padsize;
00062     unsigned int packet_frag_offset;
00063     unsigned int packet_frag_size;
00064     int64_t packet_frag_timestamp;
00065     int packet_multi_size;
00066     int packet_obj_size;
00067     int packet_time_delta;
00068     int packet_time_start;
00069     int64_t packet_pos;
00070 
00071     int stream_index;
00072 
00073     ASFStream* asf_st;                   
00074 } ASFContext;
00075 
00076 #undef NDEBUG
00077 #include <assert.h>
00078 
00079 #define ASF_MAX_STREAMS 127
00080 #define FRAME_HEADER_SIZE 17
00081 // Fix Me! FRAME_HEADER_SIZE may be different.
00082 
00083 static const ff_asf_guid index_guid = {
00084     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
00085 };
00086 
00087 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
00088     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
00089 };
00090 /**********************************/
00091 /* decoding */
00092 
00093 #ifdef DEBUG
00094 #define PRINT_IF_GUID(g,cmp) \
00095 if (!ff_guidcmp(g, &cmp)) \
00096     av_dlog(NULL, "(GUID: %s) ", #cmp)
00097 
00098 static void print_guid(const ff_asf_guid *g)
00099 {
00100     int i;
00101     PRINT_IF_GUID(g, ff_asf_header);
00102     else PRINT_IF_GUID(g, ff_asf_file_header);
00103     else PRINT_IF_GUID(g, ff_asf_stream_header);
00104     else PRINT_IF_GUID(g, ff_asf_audio_stream);
00105     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
00106     else PRINT_IF_GUID(g, ff_asf_video_stream);
00107     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
00108     else PRINT_IF_GUID(g, ff_asf_command_stream);
00109     else PRINT_IF_GUID(g, ff_asf_comment_header);
00110     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
00111     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
00112     else PRINT_IF_GUID(g, ff_asf_data_header);
00113     else PRINT_IF_GUID(g, index_guid);
00114     else PRINT_IF_GUID(g, ff_asf_head1_guid);
00115     else PRINT_IF_GUID(g, ff_asf_head2_guid);
00116     else PRINT_IF_GUID(g, ff_asf_my_guid);
00117     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
00118     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
00119     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
00120     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
00121     else PRINT_IF_GUID(g, ff_asf_metadata_header);
00122     else PRINT_IF_GUID(g, ff_asf_marker_header);
00123     else PRINT_IF_GUID(g, stream_bitrate_guid);
00124     else PRINT_IF_GUID(g, ff_asf_language_guid);
00125     else
00126         av_dlog(NULL, "(GUID: unknown) ");
00127     for(i=0;i<16;i++)
00128         av_dlog(NULL, " 0x%02x,", (*g)[i]);
00129     av_dlog(NULL, "}\n");
00130 }
00131 #undef PRINT_IF_GUID
00132 #else
00133 #define print_guid(g)
00134 #endif
00135 
00136 void ff_get_guid(AVIOContext *s, ff_asf_guid *g)
00137 {
00138     assert(sizeof(*g) == 16);
00139     avio_read(s, *g, sizeof(*g));
00140 }
00141 
00142 static int asf_probe(AVProbeData *pd)
00143 {
00144     /* check file header */
00145     if (!ff_guidcmp(pd->buf, &ff_asf_header))
00146         return AVPROBE_SCORE_MAX;
00147     else
00148         return 0;
00149 }
00150 
00151 static int get_value(AVIOContext *pb, int type){
00152     switch(type){
00153         case 2: return avio_rl32(pb);
00154         case 3: return avio_rl32(pb);
00155         case 4: return avio_rl64(pb);
00156         case 5: return avio_rl16(pb);
00157         default:return INT_MIN;
00158     }
00159 }
00160 
00161 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
00162 {
00163     char *value;
00164     int64_t off = avio_tell(s->pb);
00165 
00166     if ((unsigned)len >= (UINT_MAX - 1)/2)
00167         return;
00168 
00169     value = av_malloc(2*len+1);
00170     if (!value)
00171         goto finish;
00172 
00173     if (type == 0) {         // UTF16-LE
00174         avio_get_str16le(s->pb, len, value, 2*len + 1);
00175     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
00176         uint64_t num = get_value(s->pb, type);
00177         snprintf(value, len, "%"PRIu64, num);
00178     } else {
00179         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
00180         goto finish;
00181     }
00182     if (*value)
00183         av_dict_set(&s->metadata, key, value, 0);
00184 finish:
00185     av_freep(&value);
00186     avio_seek(s->pb, off + len, SEEK_SET);
00187 }
00188 
00189 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
00190 {
00191     ASFContext *asf = s->priv_data;
00192     AVIOContext *pb = s->pb;
00193 
00194     ff_get_guid(pb, &asf->hdr.guid);
00195     asf->hdr.file_size          = avio_rl64(pb);
00196     asf->hdr.create_time        = avio_rl64(pb);
00197     avio_rl64(pb);                               /* number of packets */
00198     asf->hdr.play_time          = avio_rl64(pb);
00199     asf->hdr.send_time          = avio_rl64(pb);
00200     asf->hdr.preroll            = avio_rl32(pb);
00201     asf->hdr.ignore             = avio_rl32(pb);
00202     asf->hdr.flags              = avio_rl32(pb);
00203     asf->hdr.min_pktsize        = avio_rl32(pb);
00204     asf->hdr.max_pktsize        = avio_rl32(pb);
00205     asf->hdr.max_bitrate        = avio_rl32(pb);
00206     s->packet_size = asf->hdr.max_pktsize;
00207 
00208     return 0;
00209 }
00210 
00211 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
00212 {
00213     ASFContext *asf = s->priv_data;
00214     AVIOContext *pb = s->pb;
00215     AVStream *st;
00216     ASFStream *asf_st;
00217     ff_asf_guid g;
00218     enum AVMediaType type;
00219     int type_specific_size, sizeX;
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     if (s->nb_streams == ASF_MAX_STREAMS) {
00225         av_log(s, AV_LOG_ERROR, "too many streams\n");
00226         return AVERROR(EINVAL);
00227     }
00228 
00229     pos1 = avio_tell(pb);
00230 
00231     st = av_new_stream(s, 0);
00232     if (!st)
00233         return AVERROR(ENOMEM);
00234     av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00235     asf_st = av_mallocz(sizeof(ASFStream));
00236     if (!asf_st)
00237         return AVERROR(ENOMEM);
00238     st->priv_data = asf_st;
00239     st->start_time = 0;
00240     start_time = asf->hdr.preroll;
00241 
00242     asf_st->stream_language_index = 128; // invalid stream index means no language info
00243 
00244     if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00245         st->duration = asf->hdr.play_time /
00246             (10000000 / 1000) - start_time;
00247     }
00248     ff_get_guid(pb, &g);
00249 
00250     test_for_ext_stream_audio = 0;
00251     if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
00252         type = AVMEDIA_TYPE_AUDIO;
00253     } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
00254         type = AVMEDIA_TYPE_VIDEO;
00255     } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
00256         type = AVMEDIA_TYPE_VIDEO;
00257         st->codec->codec_id = CODEC_ID_MJPEG;
00258     } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
00259         type = AVMEDIA_TYPE_DATA;
00260     } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
00261         test_for_ext_stream_audio = 1;
00262         type = AVMEDIA_TYPE_UNKNOWN;
00263     } else {
00264         return -1;
00265     }
00266     ff_get_guid(pb, &g);
00267     avio_skip(pb, 8); /* total_size */
00268     type_specific_size = avio_rl32(pb);
00269     avio_rl32(pb);
00270     st->id = avio_rl16(pb) & 0x7f; /* stream id */
00271     // mapping of asf ID to AV stream ID;
00272     asf->asfid2avid[st->id] = s->nb_streams - 1;
00273 
00274     avio_rl32(pb);
00275 
00276     if (test_for_ext_stream_audio) {
00277         ff_get_guid(pb, &g);
00278         if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
00279             type = AVMEDIA_TYPE_AUDIO;
00280             is_dvr_ms_audio=1;
00281             ff_get_guid(pb, &g);
00282             avio_rl32(pb);
00283             avio_rl32(pb);
00284             avio_rl32(pb);
00285             ff_get_guid(pb, &g);
00286             avio_rl32(pb);
00287         }
00288     }
00289 
00290     st->codec->codec_type = type;
00291     if (type == AVMEDIA_TYPE_AUDIO) {
00292         int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
00293         if (ret < 0)
00294             return ret;
00295         if (is_dvr_ms_audio) {
00296             // codec_id and codec_tag are unreliable in dvr_ms
00297             // files. Set them later by probing stream.
00298             st->codec->codec_id = CODEC_ID_PROBE;
00299             st->codec->codec_tag = 0;
00300         }
00301         if (st->codec->codec_id == CODEC_ID_AAC) {
00302             st->need_parsing = AVSTREAM_PARSE_NONE;
00303         } else {
00304             st->need_parsing = AVSTREAM_PARSE_FULL;
00305         }
00306         /* We have to init the frame size at some point .... */
00307         pos2 = avio_tell(pb);
00308         if (size >= (pos2 + 8 - pos1 + 24)) {
00309             asf_st->ds_span = avio_r8(pb);
00310             asf_st->ds_packet_size = avio_rl16(pb);
00311             asf_st->ds_chunk_size = avio_rl16(pb);
00312             avio_rl16(pb); //ds_data_size
00313             avio_r8(pb);   //ds_silence_data
00314         }
00315         //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
00316         //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
00317         //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
00318         if (asf_st->ds_span > 1) {
00319             if (!asf_st->ds_chunk_size
00320                     || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00321                     || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00322                 asf_st->ds_span = 0; // disable descrambling
00323         }
00324         switch (st->codec->codec_id) {
00325             case CODEC_ID_MP3:
00326                 st->codec->frame_size = MPA_FRAME_SIZE;
00327                 break;
00328             case CODEC_ID_PCM_S16LE:
00329             case CODEC_ID_PCM_S16BE:
00330             case CODEC_ID_PCM_U16LE:
00331             case CODEC_ID_PCM_U16BE:
00332             case CODEC_ID_PCM_S8:
00333             case CODEC_ID_PCM_U8:
00334             case CODEC_ID_PCM_ALAW:
00335             case CODEC_ID_PCM_MULAW:
00336                 st->codec->frame_size = 1;
00337                 break;
00338             default:
00339                 /* This is probably wrong, but it prevents a crash later */
00340                 st->codec->frame_size = 1;
00341                 break;
00342         }
00343     } else if (type == AVMEDIA_TYPE_VIDEO &&
00344             size - (avio_tell(pb) - pos1 + 24) >= 51) {
00345         avio_rl32(pb);
00346         avio_rl32(pb);
00347         avio_r8(pb);
00348         avio_rl16(pb);        /* size */
00349         sizeX= avio_rl32(pb); /* size */
00350         st->codec->width = avio_rl32(pb);
00351         st->codec->height = avio_rl32(pb);
00352         /* not available for asf */
00353         avio_rl16(pb); /* panes */
00354         st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
00355         tag1 = avio_rl32(pb);
00356         avio_skip(pb, 20);
00357         //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
00358         if (sizeX > 40) {
00359             st->codec->extradata_size = sizeX - 40;
00360             st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00361             avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00362         }
00363 
00364         /* Extract palette from extradata if bpp <= 8 */
00365         /* This code assumes that extradata contains only palette */
00366         /* This is true for all paletted codecs implemented in ffmpeg */
00367         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00368             int av_unused i;
00369 #if HAVE_BIGENDIAN
00370             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00371                 asf_st->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
00372 #else
00373             memcpy(asf_st->palette, st->codec->extradata,
00374                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00375 #endif
00376             asf_st->palette_changed = 1;
00377         }
00378 
00379         st->codec->codec_tag = tag1;
00380         st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00381         if(tag1 == MKTAG('D', 'V', 'R', ' ')){
00382             st->need_parsing = AVSTREAM_PARSE_FULL;
00383             // issue658 containse wrong w/h and MS even puts a fake seq header with wrong w/h in extradata while a correct one is in te stream. maximum lameness
00384             st->codec->width  =
00385                 st->codec->height = 0;
00386             av_freep(&st->codec->extradata);
00387             st->codec->extradata_size=0;
00388         }
00389         if(st->codec->codec_id == CODEC_ID_H264)
00390             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
00391     }
00392     pos2 = avio_tell(pb);
00393     avio_skip(pb, size - (pos2 - pos1 + 24));
00394 
00395     return 0;
00396 }
00397 
00398 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
00399 {
00400     ASFContext *asf = s->priv_data;
00401     AVIOContext *pb = s->pb;
00402     ff_asf_guid g;
00403     int ext_len, payload_ext_ct, stream_ct, i;
00404     uint32_t leak_rate, stream_num;
00405     unsigned int stream_languageid_index;
00406 
00407     avio_rl64(pb); // starttime
00408     avio_rl64(pb); // endtime
00409     leak_rate = avio_rl32(pb); // leak-datarate
00410     avio_rl32(pb); // bucket-datasize
00411     avio_rl32(pb); // init-bucket-fullness
00412     avio_rl32(pb); // alt-leak-datarate
00413     avio_rl32(pb); // alt-bucket-datasize
00414     avio_rl32(pb); // alt-init-bucket-fullness
00415     avio_rl32(pb); // max-object-size
00416     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00417     stream_num = avio_rl16(pb); // stream-num
00418 
00419     stream_languageid_index = avio_rl16(pb); // stream-language-id-index
00420     if (stream_num < 128)
00421         asf->streams[stream_num].stream_language_index = stream_languageid_index;
00422 
00423     avio_rl64(pb); // avg frametime in 100ns units
00424     stream_ct = avio_rl16(pb); //stream-name-count
00425     payload_ext_ct = avio_rl16(pb); //payload-extension-system-count
00426 
00427     if (stream_num < 128)
00428         asf->stream_bitrates[stream_num] = leak_rate;
00429 
00430     for (i=0; i<stream_ct; i++){
00431         avio_rl16(pb);
00432         ext_len = avio_rl16(pb);
00433         avio_skip(pb, ext_len);
00434     }
00435 
00436     for (i=0; i<payload_ext_ct; i++){
00437         ff_get_guid(pb, &g);
00438         avio_skip(pb, 2);
00439         ext_len=avio_rl32(pb);
00440         avio_skip(pb, ext_len);
00441     }
00442 
00443     return 0;
00444 }
00445 
00446 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
00447 {
00448     AVIOContext *pb = s->pb;
00449     int len1, len2, len3, len4, len5;
00450 
00451     len1 = avio_rl16(pb);
00452     len2 = avio_rl16(pb);
00453     len3 = avio_rl16(pb);
00454     len4 = avio_rl16(pb);
00455     len5 = avio_rl16(pb);
00456     get_tag(s, "title"    , 0, len1);
00457     get_tag(s, "author"   , 0, len2);
00458     get_tag(s, "copyright", 0, len3);
00459     get_tag(s, "comment"  , 0, len4);
00460     avio_skip(pb, len5);
00461 
00462     return 0;
00463 }
00464 
00465 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
00466 {
00467     AVIOContext *pb = s->pb;
00468     ASFContext *asf = s->priv_data;
00469     int desc_count, i, ret;
00470 
00471     desc_count = avio_rl16(pb);
00472     for(i=0;i<desc_count;i++) {
00473         int name_len,value_type,value_len;
00474         char name[1024];
00475 
00476         name_len = avio_rl16(pb);
00477         if (name_len%2)     // must be even, broken lavf versions wrote len-1
00478             name_len += 1;
00479         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00480             avio_skip(pb, name_len - ret);
00481         value_type = avio_rl16(pb);
00482         value_len  = avio_rl16(pb);
00483         if (!value_type && value_len%2)
00484             value_len += 1;
00489         if (!strcmp(name, "AspectRatioX")){
00490             asf->dar[0].num= get_value(s->pb, value_type);
00491         } else if(!strcmp(name, "AspectRatioY")){
00492             asf->dar[0].den= get_value(s->pb, value_type);
00493         } else
00494             get_tag(s, name, value_type, value_len);
00495     }
00496 
00497     return 0;
00498 }
00499 
00500 static int asf_read_language_list(AVFormatContext *s, int64_t size)
00501 {
00502     AVIOContext *pb = s->pb;
00503     ASFContext *asf = s->priv_data;
00504     int j, ret;
00505     int stream_count = avio_rl16(pb);
00506     for(j = 0; j < stream_count; j++) {
00507         char lang[6];
00508         unsigned int lang_len = avio_r8(pb);
00509         if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
00510             avio_skip(pb, lang_len - ret);
00511         if (j < 128)
00512             av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
00513     }
00514 
00515     return 0;
00516 }
00517 
00518 static int asf_read_metadata(AVFormatContext *s, int64_t size)
00519 {
00520     AVIOContext *pb = s->pb;
00521     ASFContext *asf = s->priv_data;
00522     int n, stream_num, name_len, value_len, value_num;
00523     int ret, i;
00524     n = avio_rl16(pb);
00525 
00526     for(i=0;i<n;i++) {
00527         char name[1024];
00528 
00529         avio_rl16(pb); //lang_list_index
00530         stream_num= avio_rl16(pb);
00531         name_len=   avio_rl16(pb);
00532         avio_skip(pb, 2); /* value_type */
00533         value_len=  avio_rl32(pb);
00534 
00535         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00536             avio_skip(pb, name_len - ret);
00537         //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
00538         value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00539         avio_skip(pb, value_len - 2);
00540 
00541         if(stream_num<128){
00542             if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
00543             else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
00544         }
00545     }
00546 
00547     return 0;
00548 }
00549 
00550 static int asf_read_marker(AVFormatContext *s, int64_t size)
00551 {
00552     AVIOContext *pb = s->pb;
00553     int i, count, name_len, ret;
00554     char name[1024];
00555 
00556     avio_rl64(pb);            // reserved 16 bytes
00557     avio_rl64(pb);            // ...
00558     count = avio_rl32(pb);    // markers count
00559     avio_rl16(pb);            // reserved 2 bytes
00560     name_len = avio_rl16(pb); // name length
00561     for(i=0;i<name_len;i++){
00562         avio_r8(pb); // skip the name
00563     }
00564 
00565     for(i=0;i<count;i++){
00566         int64_t pres_time;
00567         int name_len;
00568 
00569         avio_rl64(pb);             // offset, 8 bytes
00570         pres_time = avio_rl64(pb); // presentation time
00571         avio_rl16(pb);             // entry length
00572         avio_rl32(pb);             // send time
00573         avio_rl32(pb);             // flags
00574         name_len = avio_rl32(pb);  // name length
00575         if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
00576             avio_skip(pb, name_len - ret);
00577         ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
00578     }
00579 
00580     return 0;
00581 }
00582 
00583 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
00584 {
00585     ASFContext *asf = s->priv_data;
00586     ff_asf_guid g;
00587     AVIOContext *pb = s->pb;
00588     int i;
00589     int64_t gsize;
00590 
00591     ff_get_guid(pb, &g);
00592     if (ff_guidcmp(&g, &ff_asf_header))
00593         return -1;
00594     avio_rl64(pb);
00595     avio_rl32(pb);
00596     avio_r8(pb);
00597     avio_r8(pb);
00598     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00599     for(;;) {
00600         uint64_t gpos= avio_tell(pb);
00601         ff_get_guid(pb, &g);
00602         gsize = avio_rl64(pb);
00603         av_dlog(s, "%08"PRIx64": ", gpos);
00604         print_guid(&g);
00605         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
00606         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
00607             asf->data_object_offset = avio_tell(pb);
00608             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00609             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00610                 asf->data_object_size = gsize - 24;
00611             } else {
00612                 asf->data_object_size = (uint64_t)-1;
00613             }
00614             break;
00615         }
00616         if (gsize < 24)
00617             return -1;
00618         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
00619             asf_read_file_properties(s, gsize);
00620         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
00621             asf_read_stream_properties(s, gsize);
00622         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00623             asf_read_content_desc(s, gsize);
00624         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00625             asf_read_language_list(s, gsize);
00626         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00627             asf_read_ext_content_desc(s, gsize);
00628         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00629             asf_read_metadata(s, gsize);
00630         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00631             asf_read_ext_stream_properties(s, gsize);
00632 
00633             // there could be a optional stream properties object to follow
00634             // if so the next iteration will pick it up
00635             continue;
00636         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00637             ff_get_guid(pb, &g);
00638             avio_skip(pb, 6);
00639             continue;
00640         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00641             asf_read_marker(s, gsize);
00642         } else if (pb->eof_reached) {
00643             return -1;
00644         } else {
00645             if (!s->keylen) {
00646                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00647                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00648                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00649                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00650                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00651                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
00652                 }
00653             }
00654         }
00655         if(avio_tell(pb) != gpos + gsize)
00656             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
00657         avio_seek(pb, gpos + gsize, SEEK_SET);
00658     }
00659     ff_get_guid(pb, &g);
00660     avio_rl64(pb);
00661     avio_r8(pb);
00662     avio_r8(pb);
00663     if (pb->eof_reached)
00664         return -1;
00665     asf->data_offset = avio_tell(pb);
00666     asf->packet_size_left = 0;
00667 
00668 
00669     for(i=0; i<128; i++){
00670         int stream_num= asf->asfid2avid[i];
00671         if(stream_num>=0){
00672             AVStream *st = s->streams[stream_num];
00673             if (!st->codec->bit_rate)
00674                 st->codec->bit_rate = asf->stream_bitrates[i];
00675             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
00676                 av_reduce(&st->sample_aspect_ratio.num,
00677                           &st->sample_aspect_ratio.den,
00678                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
00679             } else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
00680                 av_reduce(&st->sample_aspect_ratio.num,
00681                           &st->sample_aspect_ratio.den,
00682                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
00683 
00684 //av_log(s, AV_LOG_INFO, "i=%d, st->codec->codec_type:%d, dar %d:%d sar=%d:%d\n", i, st->codec->codec_type, dar[i].num, dar[i].den, st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
00685 
00686             // copy and convert language codes to the frontend
00687             if (asf->streams[i].stream_language_index < 128) {
00688                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00689                 if (rfc1766 && strlen(rfc1766) > 1) {
00690                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00691                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00692                     if (iso6392)
00693                         av_dict_set(&st->metadata, "language", iso6392, 0);
00694                 }
00695             }
00696         }
00697     }
00698 
00699     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00700 
00701     return 0;
00702 }
00703 
00704 #define DO_2BITS(bits, var, defval) \
00705     switch (bits & 3) \
00706     { \
00707     case 3: var = avio_rl32(pb); rsize += 4; break; \
00708     case 2: var = avio_rl16(pb); rsize += 2; break; \
00709     case 1: var = avio_r8(pb);   rsize++; break; \
00710     default: var = defval; break; \
00711     }
00712 
00719 static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
00720 {
00721     ASFContext *asf = s->priv_data;
00722     uint32_t packet_length, padsize;
00723     int rsize = 8;
00724     int c, d, e, off;
00725 
00726     // if we do not know packet size, allow skipping up to 32 kB
00727     off= 32768;
00728     if (s->packet_size > 0)
00729         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
00730 
00731     c=d=e=-1;
00732     while(off-- > 0){
00733         c=d; d=e;
00734         e= avio_r8(pb);
00735         if(c == 0x82 && !d && !e)
00736             break;
00737     }
00738 
00739     if (c != 0x82) {
00746         if (pb->error == AVERROR(EAGAIN))
00747             return AVERROR(EAGAIN);
00748         if (!pb->eof_reached)
00749             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
00750     }
00751     if ((c & 0x8f) == 0x82) {
00752         if (d || e) {
00753             if (!pb->eof_reached)
00754                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00755             return -1;
00756         }
00757         c= avio_r8(pb);
00758         d= avio_r8(pb);
00759         rsize+=3;
00760     }else{
00761         avio_seek(pb, -1, SEEK_CUR); //FIXME
00762     }
00763 
00764     asf->packet_flags    = c;
00765     asf->packet_property = d;
00766 
00767     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00768     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00769     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00770 
00771     //the following checks prevent overflows and infinite loops
00772     if(!packet_length || packet_length >= (1U<<29)){
00773         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
00774         return -1;
00775     }
00776     if(padsize >= packet_length){
00777         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
00778         return -1;
00779     }
00780 
00781     asf->packet_timestamp = avio_rl32(pb);
00782     avio_rl16(pb); /* duration */
00783     // rsize has at least 11 bytes which have to be present
00784 
00785     if (asf->packet_flags & 0x01) {
00786         asf->packet_segsizetype = avio_r8(pb); rsize++;
00787         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00788     } else {
00789         asf->packet_segments = 1;
00790         asf->packet_segsizetype = 0x80;
00791     }
00792     asf->packet_size_left = packet_length - padsize - rsize;
00793     if (packet_length < asf->hdr.min_pktsize)
00794         padsize += asf->hdr.min_pktsize - packet_length;
00795     asf->packet_padsize = padsize;
00796     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00797     return 0;
00798 }
00799 
00804 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
00805     ASFContext *asf = s->priv_data;
00806     int rsize = 1;
00807     int num = avio_r8(pb);
00808     int64_t ts0;
00809 
00810     asf->packet_segments--;
00811     asf->packet_key_frame = num >> 7;
00812     asf->stream_index = asf->asfid2avid[num & 0x7f];
00813     // sequence should be ignored!
00814     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00815     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00816     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00817 //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);
00818     if (asf->packet_replic_size >= 8) {
00819         asf->packet_obj_size = avio_rl32(pb);
00820         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00821             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00822             return -1;
00823         }
00824         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
00825         if(asf->packet_replic_size >= 8+38+4){
00826 //            for(i=0; i<asf->packet_replic_size-8; i++)
00827 //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
00828 //            av_log(s, AV_LOG_DEBUG, "\n");
00829             avio_skip(pb, 10);
00830             ts0= avio_rl64(pb);
00831             avio_skip(pb, 8);;
00832             avio_skip(pb, 12);
00833             avio_rl32(pb);
00834             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
00835             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00836             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00837         }else
00838             avio_skip(pb, asf->packet_replic_size - 8);
00839         rsize += asf->packet_replic_size; // FIXME - check validity
00840     } else if (asf->packet_replic_size==1){
00841         // multipacket - frag_offset is beginning timestamp
00842         asf->packet_time_start = asf->packet_frag_offset;
00843         asf->packet_frag_offset = 0;
00844         asf->packet_frag_timestamp = asf->packet_timestamp;
00845 
00846         asf->packet_time_delta = avio_r8(pb);
00847         rsize++;
00848     }else if(asf->packet_replic_size!=0){
00849         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00850         return -1;
00851     }
00852     if (asf->packet_flags & 0x01) {
00853         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00854         if (rsize > asf->packet_size_left) {
00855             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00856             return -1;
00857         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
00858             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
00859                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
00860                 return -1;
00861             } else {
00862                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
00863                 asf->packet_size_left += diff;
00864                 asf->packet_padsize   -= diff;
00865             }
00866         }
00867         //printf("Fragsize %d\n", asf->packet_frag_size);
00868     } else {
00869         if (rsize > asf->packet_size_left) {
00870             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00871             return -1;
00872         }
00873         asf->packet_frag_size = asf->packet_size_left - rsize;
00874         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00875     }
00876     if (asf->packet_replic_size == 1) {
00877         asf->packet_multi_size = asf->packet_frag_size;
00878         if (asf->packet_multi_size > asf->packet_size_left)
00879             return -1;
00880     }
00881     asf->packet_size_left -= rsize;
00882     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00883 
00884     return 0;
00885 }
00886 
00896 static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
00897 {
00898     ASFContext *asf = s->priv_data;
00899     ASFStream *asf_st = 0;
00900     for (;;) {
00901         int ret;
00902         if(pb->eof_reached)
00903             return AVERROR_EOF;
00904         if (asf->packet_size_left < FRAME_HEADER_SIZE
00905             || asf->packet_segments < 1) {
00906             //asf->packet_size_left <= asf->packet_padsize) {
00907             int ret = asf->packet_size_left + asf->packet_padsize;
00908             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));
00909             assert(ret>=0);
00910             /* fail safe */
00911             avio_skip(pb, ret);
00912 
00913             asf->packet_pos= avio_tell(pb);
00914             if (asf->data_object_size != (uint64_t)-1 &&
00915                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00916                 return AVERROR_EOF; /* Do not exceed the size of the data object */
00917             return 1;
00918         }
00919         if (asf->packet_time_start == 0) {
00920             if(asf_read_frame_header(s, pb) < 0){
00921                 asf->packet_segments= 0;
00922                 continue;
00923             }
00924             if (asf->stream_index < 0
00925                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00926                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00927                 ) {
00928                 asf->packet_time_start = 0;
00929                 /* unhandled packet (should not happen) */
00930                 avio_skip(pb, asf->packet_frag_size);
00931                 asf->packet_size_left -= asf->packet_frag_size;
00932                 if(asf->stream_index < 0)
00933                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00934                 continue;
00935             }
00936             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00937         }
00938         asf_st = asf->asf_st;
00939 
00940         if (asf->packet_replic_size == 1) {
00941             // frag_offset is here used as the beginning timestamp
00942             asf->packet_frag_timestamp = asf->packet_time_start;
00943             asf->packet_time_start += asf->packet_time_delta;
00944             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
00945             asf->packet_size_left--;
00946             asf->packet_multi_size--;
00947             if (asf->packet_multi_size < asf->packet_obj_size)
00948             {
00949                 asf->packet_time_start = 0;
00950                 avio_skip(pb, asf->packet_multi_size);
00951                 asf->packet_size_left -= asf->packet_multi_size;
00952                 continue;
00953             }
00954             asf->packet_multi_size -= asf->packet_obj_size;
00955             //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);
00956         }
00957         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00958               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00959            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00960             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00961                 asf_st->frag_offset, asf->packet_frag_size,
00962                 asf->packet_obj_size, asf_st->pkt.size);
00963             asf->packet_obj_size= asf_st->pkt.size;
00964         }
00965 
00966         if (   asf_st->pkt.size != asf->packet_obj_size
00967             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00968             if(asf_st->pkt.data){
00969                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00970                 asf_st->frag_offset = 0;
00971                 av_free_packet(&asf_st->pkt);
00972             }
00973             /* new packet */
00974             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00975             asf_st->seq = asf->packet_seq;
00976             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
00977             asf_st->pkt.stream_index = asf->stream_index;
00978             asf_st->pkt.pos =
00979             asf_st->packet_pos= asf->packet_pos;
00980             if (asf_st->pkt.data && asf_st->palette_changed) {
00981                 uint8_t *pal;
00982                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
00983                                               AVPALETTE_SIZE);
00984                 if (!pal) {
00985                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
00986                 } else {
00987                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
00988                     asf_st->palette_changed = 0;
00989                 }
00990             }
00991 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
00992 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
00993 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
00994             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
00995                 asf->packet_key_frame = 1;
00996             if (asf->packet_key_frame)
00997                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
00998         }
00999 
01000         /* read data */
01001         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
01002         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
01003         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
01004         asf->packet_size_left -= asf->packet_frag_size;
01005         if (asf->packet_size_left < 0)
01006             continue;
01007 
01008         if(   asf->packet_frag_offset >= asf_st->pkt.size
01009            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
01010             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
01011                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
01012             continue;
01013         }
01014 
01015         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
01016                          asf->packet_frag_size);
01017         if (ret != asf->packet_frag_size) {
01018             if (ret < 0 || asf->packet_frag_offset + ret == 0)
01019                 return ret < 0 ? ret : AVERROR_EOF;
01020             if (asf_st->ds_span > 1) {
01021                 // scrambling, we can either drop it completely or fill the remainder
01022                 // TODO: should we fill the whole packet instead of just the current
01023                 // fragment?
01024                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
01025                        asf->packet_frag_size - ret);
01026                 ret = asf->packet_frag_size;
01027             } else
01028                 // no scrambling, so we can return partial packets
01029                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
01030         }
01031         if (s->key && s->keylen == 20)
01032             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
01033                             ret);
01034         asf_st->frag_offset += ret;
01035         /* test if whole packet is read */
01036         if (asf_st->frag_offset == asf_st->pkt.size) {
01037             //workaround for macroshit radio DVR-MS files
01038             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
01039                && asf_st->pkt.size > 100){
01040                 int i;
01041                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
01042                 if(i == asf_st->pkt.size){
01043                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
01044                     asf_st->frag_offset = 0;
01045                     av_free_packet(&asf_st->pkt);
01046                     continue;
01047                 }
01048             }
01049 
01050             /* return packet */
01051             if (asf_st->ds_span > 1) {
01052               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
01053                     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);
01054               }else{
01055                 /* packet descrambling */
01056                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
01057                 if (newdata) {
01058                     int offset = 0;
01059                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
01060                     while (offset < asf_st->pkt.size) {
01061                         int off = offset / asf_st->ds_chunk_size;
01062                         int row = off / asf_st->ds_span;
01063                         int col = off % asf_st->ds_span;
01064                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
01065                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
01066 
01067                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
01068                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
01069                         memcpy(newdata + offset,
01070                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
01071                                asf_st->ds_chunk_size);
01072                         offset += asf_st->ds_chunk_size;
01073                     }
01074                     av_free(asf_st->pkt.data);
01075                     asf_st->pkt.data = newdata;
01076                 }
01077               }
01078             }
01079             asf_st->frag_offset = 0;
01080             *pkt= asf_st->pkt;
01081             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
01082             asf_st->pkt.size = 0;
01083             asf_st->pkt.data = 0;
01084             break; // packet completed
01085         }
01086     }
01087     return 0;
01088 }
01089 
01090 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
01091 {
01092     ASFContext *asf = s->priv_data;
01093 
01094     for (;;) {
01095         int ret;
01096 
01097         /* parse cached packets, if any */
01098         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
01099             return ret;
01100         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
01101             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
01102         asf->packet_time_start = 0;
01103     }
01104 
01105     return 0;
01106 }
01107 
01108 // Added to support seeking after packets have been read
01109 // If information is not reset, read_packet fails due to
01110 // leftover information from previous reads
01111 static void asf_reset_header(AVFormatContext *s)
01112 {
01113     ASFContext *asf = s->priv_data;
01114     ASFStream *asf_st;
01115     int i;
01116 
01117     asf->packet_size_left = 0;
01118     asf->packet_segments = 0;
01119     asf->packet_flags = 0;
01120     asf->packet_property = 0;
01121     asf->packet_timestamp = 0;
01122     asf->packet_segsizetype = 0;
01123     asf->packet_segments = 0;
01124     asf->packet_seq = 0;
01125     asf->packet_replic_size = 0;
01126     asf->packet_key_frame = 0;
01127     asf->packet_padsize = 0;
01128     asf->packet_frag_offset = 0;
01129     asf->packet_frag_size = 0;
01130     asf->packet_frag_timestamp = 0;
01131     asf->packet_multi_size = 0;
01132     asf->packet_obj_size = 0;
01133     asf->packet_time_delta = 0;
01134     asf->packet_time_start = 0;
01135 
01136     for(i=0; i<s->nb_streams; i++){
01137         asf_st= s->streams[i]->priv_data;
01138         av_free_packet(&asf_st->pkt);
01139         asf_st->frag_offset=0;
01140         asf_st->seq=0;
01141     }
01142     asf->asf_st= NULL;
01143 }
01144 
01145 static int asf_read_close(AVFormatContext *s)
01146 {
01147     asf_reset_header(s);
01148 
01149     return 0;
01150 }
01151 
01152 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01153 {
01154     AVPacket pkt1, *pkt = &pkt1;
01155     ASFStream *asf_st;
01156     int64_t pts;
01157     int64_t pos= *ppos;
01158     int i;
01159     int64_t start_pos[ASF_MAX_STREAMS];
01160 
01161     for(i=0; i<s->nb_streams; i++){
01162         start_pos[i]= pos;
01163     }
01164 
01165     if (s->packet_size > 0)
01166         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01167     *ppos= pos;
01168     avio_seek(s->pb, pos, SEEK_SET);
01169 
01170 //printf("asf_read_pts\n");
01171     asf_reset_header(s);
01172     for(;;){
01173         if (av_read_frame(s, pkt) < 0){
01174             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01175             return AV_NOPTS_VALUE;
01176         }
01177 
01178         pts= pkt->pts;
01179 
01180         av_free_packet(pkt);
01181         if(pkt->flags&AV_PKT_FLAG_KEY){
01182             i= pkt->stream_index;
01183 
01184             asf_st= s->streams[i]->priv_data;
01185 
01186 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01187             pos= asf_st->packet_pos;
01188 
01189             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01190             start_pos[i]= asf_st->packet_pos + 1;
01191 
01192             if(pkt->stream_index == stream_index)
01193                break;
01194         }
01195     }
01196 
01197     *ppos= pos;
01198 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01199 
01200     return pts;
01201 }
01202 
01203 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01204 {
01205     ff_asf_guid g;
01206     ASFContext *asf = s->priv_data;
01207     int64_t current_pos= avio_tell(s->pb);
01208     int i;
01209 
01210     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
01211     ff_get_guid(s->pb, &g);
01212 
01213     /* the data object can be followed by other top-level objects,
01214        skip them until the simple index object is reached */
01215     while (ff_guidcmp(&g, &index_guid)) {
01216         int64_t gsize= avio_rl64(s->pb);
01217         if (gsize < 24 || s->pb->eof_reached) {
01218             avio_seek(s->pb, current_pos, SEEK_SET);
01219             return;
01220         }
01221         avio_skip(s->pb, gsize-24);
01222         ff_get_guid(s->pb, &g);
01223     }
01224 
01225     {
01226         int64_t itime, last_pos=-1;
01227         int pct, ict;
01228         int64_t av_unused gsize= avio_rl64(s->pb);
01229         ff_get_guid(s->pb, &g);
01230         itime=avio_rl64(s->pb);
01231         pct=avio_rl32(s->pb);
01232         ict=avio_rl32(s->pb);
01233         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01234 
01235         for (i=0;i<ict;i++){
01236             int pktnum=avio_rl32(s->pb);
01237             int pktct =avio_rl16(s->pb);
01238             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01239             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
01240 
01241             if(pos != last_pos){
01242             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);
01243             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01244             last_pos=pos;
01245             }
01246         }
01247         asf->index_read= 1;
01248     }
01249     avio_seek(s->pb, current_pos, SEEK_SET);
01250 }
01251 
01252 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01253 {
01254     ASFContext *asf = s->priv_data;
01255     AVStream *st = s->streams[stream_index];
01256     int64_t pos;
01257     int index;
01258 
01259     if (s->packet_size <= 0)
01260         return -1;
01261 
01262     /* Try using the protocol's read_seek if available */
01263     if(s->pb) {
01264         int ret = avio_seek_time(s->pb, stream_index, pts, flags);
01265         if(ret >= 0)
01266             asf_reset_header(s);
01267         if (ret != AVERROR(ENOSYS))
01268             return ret;
01269     }
01270 
01271     if (!asf->index_read)
01272         asf_build_simple_index(s, stream_index);
01273 
01274     if((asf->index_read && st->index_entries)){
01275         index= av_index_search_timestamp(st, pts, flags);
01276         if(index >= 0) {
01277             /* find the position */
01278             pos = st->index_entries[index].pos;
01279 
01280             /* do the seek */
01281             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01282             avio_seek(s->pb, pos, SEEK_SET);
01283             asf_reset_header(s);
01284             return 0;
01285         }
01286     }
01287     /* no index or seeking by index failed */
01288     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
01289         return -1;
01290     asf_reset_header(s);
01291     return 0;
01292 }
01293 
01294 AVInputFormat ff_asf_demuxer = {
01295     "asf",
01296     NULL_IF_CONFIG_SMALL("ASF format"),
01297     sizeof(ASFContext),
01298     asf_probe,
01299     asf_read_header,
01300     asf_read_packet,
01301     asf_read_close,
01302     asf_read_seek,
01303     asf_read_pts,
01304     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
01305 };