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 "libavutil/mathematics.h"
00029 #include "libavcodec/mpegaudio.h"
00030 #include "avformat.h"
00031 #include "internal.h"
00032 #include "avio_internal.h"
00033 #include "riff.h"
00034 #include "asf.h"
00035 #include "asfcrypt.h"
00036 #include "avlanguage.h"
00037 
00038 typedef struct {
00039     int asfid2avid[128];                 
00040     ASFStream streams[128];              
00041     uint32_t stream_bitrates[128];       
00042     AVRational dar[128];
00043     char stream_languages[128][6];       
00044     /* non streamed additonnal info */
00045     /* packet filling */
00046     int packet_size_left;
00047     /* only for reading */
00048     uint64_t data_offset;                
00049     uint64_t data_object_offset;         
00050     uint64_t data_object_size;           
00051     int index_read;
00052 
00053     ASFMainHeader hdr;
00054 
00055     int packet_flags;
00056     int packet_property;
00057     int packet_timestamp;
00058     int packet_segsizetype;
00059     int packet_segments;
00060     int packet_seq;
00061     int packet_replic_size;
00062     int packet_key_frame;
00063     int packet_padsize;
00064     unsigned int packet_frag_offset;
00065     unsigned int packet_frag_size;
00066     int64_t packet_frag_timestamp;
00067     int packet_multi_size;
00068     int packet_obj_size;
00069     int packet_time_delta;
00070     int packet_time_start;
00071     int64_t packet_pos;
00072 
00073     int stream_index;
00074 
00075     ASFStream* asf_st;                   
00076 } ASFContext;
00077 
00078 #undef NDEBUG
00079 #include <assert.h>
00080 
00081 #define ASF_MAX_STREAMS 127
00082 #define FRAME_HEADER_SIZE 17
00083 // Fix Me! FRAME_HEADER_SIZE may be different.
00084 
00085 static const ff_asf_guid index_guid = {
00086     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
00087 };
00088 
00089 #ifdef DEBUG
00090 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
00091     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
00092 };
00093 
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     if (asf->hdr.min_pktsize >= (1U<<29))
00206         return AVERROR_INVALIDDATA;
00207     asf->hdr.max_bitrate        = avio_rl32(pb);
00208     s->packet_size = asf->hdr.max_pktsize;
00209 
00210     return 0;
00211 }
00212 
00213 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
00214 {
00215     ASFContext *asf = s->priv_data;
00216     AVIOContext *pb = s->pb;
00217     AVStream *st;
00218     ASFStream *asf_st;
00219     ff_asf_guid g;
00220     enum AVMediaType type;
00221     int type_specific_size, sizeX;
00222     unsigned int tag1;
00223     int64_t pos1, pos2, start_time;
00224     int test_for_ext_stream_audio, is_dvr_ms_audio=0;
00225 
00226     if (s->nb_streams == ASF_MAX_STREAMS) {
00227         av_log(s, AV_LOG_ERROR, "too many streams\n");
00228         return AVERROR(EINVAL);
00229     }
00230 
00231     pos1 = avio_tell(pb);
00232 
00233     st = avformat_new_stream(s, NULL);
00234     if (!st)
00235         return AVERROR(ENOMEM);
00236     avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00237     asf_st = av_mallocz(sizeof(ASFStream));
00238     if (!asf_st)
00239         return AVERROR(ENOMEM);
00240     st->priv_data = asf_st;
00241     st->start_time = 0;
00242     start_time = asf->hdr.preroll;
00243 
00244     asf_st->stream_language_index = 128; // invalid stream index means no language info
00245 
00246     if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00247         st->duration = asf->hdr.play_time /
00248             (10000000 / 1000) - start_time;
00249     }
00250     ff_get_guid(pb, &g);
00251 
00252     test_for_ext_stream_audio = 0;
00253     if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
00254         type = AVMEDIA_TYPE_AUDIO;
00255     } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
00256         type = AVMEDIA_TYPE_VIDEO;
00257     } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
00258         type = AVMEDIA_TYPE_VIDEO;
00259         st->codec->codec_id = CODEC_ID_MJPEG;
00260     } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
00261         type = AVMEDIA_TYPE_DATA;
00262     } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
00263         test_for_ext_stream_audio = 1;
00264         type = AVMEDIA_TYPE_UNKNOWN;
00265     } else {
00266         return -1;
00267     }
00268     ff_get_guid(pb, &g);
00269     avio_skip(pb, 8); /* total_size */
00270     type_specific_size = avio_rl32(pb);
00271     avio_rl32(pb);
00272     st->id = avio_rl16(pb) & 0x7f; /* stream id */
00273     // mapping of asf ID to AV stream ID;
00274     asf->asfid2avid[st->id] = s->nb_streams - 1;
00275 
00276     avio_rl32(pb);
00277 
00278     if (test_for_ext_stream_audio) {
00279         ff_get_guid(pb, &g);
00280         if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
00281             type = AVMEDIA_TYPE_AUDIO;
00282             is_dvr_ms_audio=1;
00283             ff_get_guid(pb, &g);
00284             avio_rl32(pb);
00285             avio_rl32(pb);
00286             avio_rl32(pb);
00287             ff_get_guid(pb, &g);
00288             avio_rl32(pb);
00289         }
00290     }
00291 
00292     st->codec->codec_type = type;
00293     if (type == AVMEDIA_TYPE_AUDIO) {
00294         int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
00295         if (ret < 0)
00296             return ret;
00297         if (is_dvr_ms_audio) {
00298             // codec_id and codec_tag are unreliable in dvr_ms
00299             // files. Set them later by probing stream.
00300             st->codec->codec_id = CODEC_ID_PROBE;
00301             st->codec->codec_tag = 0;
00302         }
00303         if (st->codec->codec_id == CODEC_ID_AAC) {
00304             st->need_parsing = AVSTREAM_PARSE_NONE;
00305         } else {
00306             st->need_parsing = AVSTREAM_PARSE_FULL;
00307         }
00308         /* We have to init the frame size at some point .... */
00309         pos2 = avio_tell(pb);
00310         if (size >= (pos2 + 8 - pos1 + 24)) {
00311             asf_st->ds_span = avio_r8(pb);
00312             asf_st->ds_packet_size = avio_rl16(pb);
00313             asf_st->ds_chunk_size = avio_rl16(pb);
00314             avio_rl16(pb); //ds_data_size
00315             avio_r8(pb);   //ds_silence_data
00316         }
00317         //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
00318         //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
00319         //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
00320         if (asf_st->ds_span > 1) {
00321             if (!asf_st->ds_chunk_size
00322                     || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00323                     || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00324                 asf_st->ds_span = 0; // disable descrambling
00325         }
00326         switch (st->codec->codec_id) {
00327             case CODEC_ID_MP3:
00328                 st->codec->frame_size = MPA_FRAME_SIZE;
00329                 break;
00330             case CODEC_ID_PCM_S16LE:
00331             case CODEC_ID_PCM_S16BE:
00332             case CODEC_ID_PCM_U16LE:
00333             case CODEC_ID_PCM_U16BE:
00334             case CODEC_ID_PCM_S8:
00335             case CODEC_ID_PCM_U8:
00336             case CODEC_ID_PCM_ALAW:
00337             case CODEC_ID_PCM_MULAW:
00338                 st->codec->frame_size = 1;
00339                 break;
00340             default:
00341                 /* This is probably wrong, but it prevents a crash later */
00342                 st->codec->frame_size = 1;
00343                 break;
00344         }
00345     } else if (type == AVMEDIA_TYPE_VIDEO &&
00346             size - (avio_tell(pb) - pos1 + 24) >= 51) {
00347         avio_rl32(pb);
00348         avio_rl32(pb);
00349         avio_r8(pb);
00350         avio_rl16(pb);        /* size */
00351         sizeX= avio_rl32(pb); /* size */
00352         st->codec->width = avio_rl32(pb);
00353         st->codec->height = avio_rl32(pb);
00354         /* not available for asf */
00355         avio_rl16(pb); /* panes */
00356         st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
00357         tag1 = avio_rl32(pb);
00358         avio_skip(pb, 20);
00359         //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
00360         if (sizeX > 40) {
00361             st->codec->extradata_size = sizeX - 40;
00362             st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00363             avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00364         }
00365 
00366         /* Extract palette from extradata if bpp <= 8 */
00367         /* This code assumes that extradata contains only palette */
00368         /* This is true for all paletted codecs implemented in libavcodec */
00369         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00370             int av_unused i;
00371 #if HAVE_BIGENDIAN
00372             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00373                 asf_st->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
00374 #else
00375             memcpy(asf_st->palette, st->codec->extradata,
00376                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00377 #endif
00378             asf_st->palette_changed = 1;
00379         }
00380 
00381         st->codec->codec_tag = tag1;
00382         st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00383         if(tag1 == MKTAG('D', 'V', 'R', ' ')){
00384             st->need_parsing = AVSTREAM_PARSE_FULL;
00385             // 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
00386             st->codec->width  =
00387                 st->codec->height = 0;
00388             av_freep(&st->codec->extradata);
00389             st->codec->extradata_size=0;
00390         }
00391         if(st->codec->codec_id == CODEC_ID_H264)
00392             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
00393     }
00394     pos2 = avio_tell(pb);
00395     avio_skip(pb, size - (pos2 - pos1 + 24));
00396 
00397     return 0;
00398 }
00399 
00400 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
00401 {
00402     ASFContext *asf = s->priv_data;
00403     AVIOContext *pb = s->pb;
00404     ff_asf_guid g;
00405     int ext_len, payload_ext_ct, stream_ct, i;
00406     uint32_t leak_rate, stream_num;
00407     unsigned int stream_languageid_index;
00408 
00409     avio_rl64(pb); // starttime
00410     avio_rl64(pb); // endtime
00411     leak_rate = avio_rl32(pb); // leak-datarate
00412     avio_rl32(pb); // bucket-datasize
00413     avio_rl32(pb); // init-bucket-fullness
00414     avio_rl32(pb); // alt-leak-datarate
00415     avio_rl32(pb); // alt-bucket-datasize
00416     avio_rl32(pb); // alt-init-bucket-fullness
00417     avio_rl32(pb); // max-object-size
00418     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00419     stream_num = avio_rl16(pb); // stream-num
00420 
00421     stream_languageid_index = avio_rl16(pb); // stream-language-id-index
00422     if (stream_num < 128)
00423         asf->streams[stream_num].stream_language_index = stream_languageid_index;
00424 
00425     avio_rl64(pb); // avg frametime in 100ns units
00426     stream_ct = avio_rl16(pb); //stream-name-count
00427     payload_ext_ct = avio_rl16(pb); //payload-extension-system-count
00428 
00429     if (stream_num < 128)
00430         asf->stream_bitrates[stream_num] = leak_rate;
00431 
00432     for (i=0; i<stream_ct; i++){
00433         avio_rl16(pb);
00434         ext_len = avio_rl16(pb);
00435         avio_skip(pb, ext_len);
00436     }
00437 
00438     for (i=0; i<payload_ext_ct; i++){
00439         ff_get_guid(pb, &g);
00440         avio_skip(pb, 2);
00441         ext_len=avio_rl32(pb);
00442         avio_skip(pb, ext_len);
00443     }
00444 
00445     return 0;
00446 }
00447 
00448 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
00449 {
00450     AVIOContext *pb = s->pb;
00451     int len1, len2, len3, len4, len5;
00452 
00453     len1 = avio_rl16(pb);
00454     len2 = avio_rl16(pb);
00455     len3 = avio_rl16(pb);
00456     len4 = avio_rl16(pb);
00457     len5 = avio_rl16(pb);
00458     get_tag(s, "title"    , 0, len1);
00459     get_tag(s, "author"   , 0, len2);
00460     get_tag(s, "copyright", 0, len3);
00461     get_tag(s, "comment"  , 0, len4);
00462     avio_skip(pb, len5);
00463 
00464     return 0;
00465 }
00466 
00467 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
00468 {
00469     AVIOContext *pb = s->pb;
00470     ASFContext *asf = s->priv_data;
00471     int desc_count, i, ret;
00472 
00473     desc_count = avio_rl16(pb);
00474     for(i=0;i<desc_count;i++) {
00475         int name_len,value_type,value_len;
00476         char name[1024];
00477 
00478         name_len = avio_rl16(pb);
00479         if (name_len%2)     // must be even, broken lavf versions wrote len-1
00480             name_len += 1;
00481         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00482             avio_skip(pb, name_len - ret);
00483         value_type = avio_rl16(pb);
00484         value_len  = avio_rl16(pb);
00485         if (!value_type && value_len%2)
00486             value_len += 1;
00491         if (!strcmp(name, "AspectRatioX")){
00492             asf->dar[0].num= get_value(s->pb, value_type);
00493         } else if(!strcmp(name, "AspectRatioY")){
00494             asf->dar[0].den= get_value(s->pb, value_type);
00495         } else
00496             get_tag(s, name, value_type, value_len);
00497     }
00498 
00499     return 0;
00500 }
00501 
00502 static int asf_read_language_list(AVFormatContext *s, int64_t size)
00503 {
00504     AVIOContext *pb = s->pb;
00505     ASFContext *asf = s->priv_data;
00506     int j, ret;
00507     int stream_count = avio_rl16(pb);
00508     for(j = 0; j < stream_count; j++) {
00509         char lang[6];
00510         unsigned int lang_len = avio_r8(pb);
00511         if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
00512             avio_skip(pb, lang_len - ret);
00513         if (j < 128)
00514             av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
00515     }
00516 
00517     return 0;
00518 }
00519 
00520 static int asf_read_metadata(AVFormatContext *s, int64_t size)
00521 {
00522     AVIOContext *pb = s->pb;
00523     ASFContext *asf = s->priv_data;
00524     int n, stream_num, name_len, value_len, value_num;
00525     int ret, i;
00526     n = avio_rl16(pb);
00527 
00528     for(i=0;i<n;i++) {
00529         char name[1024];
00530 
00531         avio_rl16(pb); //lang_list_index
00532         stream_num= avio_rl16(pb);
00533         name_len=   avio_rl16(pb);
00534         avio_skip(pb, 2); /* value_type */
00535         value_len=  avio_rl32(pb);
00536 
00537         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00538             avio_skip(pb, name_len - ret);
00539         //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
00540         value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00541         avio_skip(pb, value_len - 2);
00542 
00543         if(stream_num<128){
00544             if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
00545             else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
00546         }
00547     }
00548 
00549     return 0;
00550 }
00551 
00552 static int asf_read_marker(AVFormatContext *s, int64_t size)
00553 {
00554     AVIOContext *pb = s->pb;
00555     int i, count, name_len, ret;
00556     char name[1024];
00557 
00558     avio_rl64(pb);            // reserved 16 bytes
00559     avio_rl64(pb);            // ...
00560     count = avio_rl32(pb);    // markers count
00561     avio_rl16(pb);            // reserved 2 bytes
00562     name_len = avio_rl16(pb); // name length
00563     for(i=0;i<name_len;i++){
00564         avio_r8(pb); // skip the name
00565     }
00566 
00567     for(i=0;i<count;i++){
00568         int64_t pres_time;
00569         int name_len;
00570 
00571         avio_rl64(pb);             // offset, 8 bytes
00572         pres_time = avio_rl64(pb); // presentation time
00573         avio_rl16(pb);             // entry length
00574         avio_rl32(pb);             // send time
00575         avio_rl32(pb);             // flags
00576         name_len = avio_rl32(pb);  // name length
00577         if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
00578             avio_skip(pb, name_len - ret);
00579         avpriv_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
00580     }
00581 
00582     return 0;
00583 }
00584 
00585 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
00586 {
00587     ASFContext *asf = s->priv_data;
00588     ff_asf_guid g;
00589     AVIOContext *pb = s->pb;
00590     int i;
00591     int64_t gsize;
00592 
00593     ff_get_guid(pb, &g);
00594     if (ff_guidcmp(&g, &ff_asf_header))
00595         return -1;
00596     avio_rl64(pb);
00597     avio_rl32(pb);
00598     avio_r8(pb);
00599     avio_r8(pb);
00600     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00601     for(;;) {
00602         uint64_t gpos= avio_tell(pb);
00603         ff_get_guid(pb, &g);
00604         gsize = avio_rl64(pb);
00605         av_dlog(s, "%08"PRIx64": ", gpos);
00606         print_guid(&g);
00607         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
00608         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
00609             asf->data_object_offset = avio_tell(pb);
00610             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00611             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00612                 asf->data_object_size = gsize - 24;
00613             } else {
00614                 asf->data_object_size = (uint64_t)-1;
00615             }
00616             break;
00617         }
00618         if (gsize < 24)
00619             return -1;
00620         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
00621             int ret = asf_read_file_properties(s, gsize);
00622             if (ret < 0)
00623                 return ret;
00624         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
00625             int ret = asf_read_stream_properties(s, gsize);
00626             if (ret < 0)
00627                 return ret;
00628         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00629             asf_read_content_desc(s, gsize);
00630         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00631             asf_read_language_list(s, gsize);
00632         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00633             asf_read_ext_content_desc(s, gsize);
00634         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00635             asf_read_metadata(s, gsize);
00636         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00637             asf_read_ext_stream_properties(s, gsize);
00638 
00639             // there could be a optional stream properties object to follow
00640             // if so the next iteration will pick it up
00641             continue;
00642         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00643             ff_get_guid(pb, &g);
00644             avio_skip(pb, 6);
00645             continue;
00646         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00647             asf_read_marker(s, gsize);
00648         } else if (pb->eof_reached) {
00649             return -1;
00650         } else {
00651             if (!s->keylen) {
00652                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00653                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00654                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00655                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00656                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00657                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
00658                 }
00659             }
00660         }
00661         if(avio_tell(pb) != gpos + gsize)
00662             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
00663         avio_seek(pb, gpos + gsize, SEEK_SET);
00664     }
00665     ff_get_guid(pb, &g);
00666     avio_rl64(pb);
00667     avio_r8(pb);
00668     avio_r8(pb);
00669     if (pb->eof_reached)
00670         return -1;
00671     asf->data_offset = avio_tell(pb);
00672     asf->packet_size_left = 0;
00673 
00674 
00675     for(i=0; i<128; i++){
00676         int stream_num= asf->asfid2avid[i];
00677         if(stream_num>=0){
00678             AVStream *st = s->streams[stream_num];
00679             if (!st->codec->bit_rate)
00680                 st->codec->bit_rate = asf->stream_bitrates[i];
00681             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
00682                 av_reduce(&st->sample_aspect_ratio.num,
00683                           &st->sample_aspect_ratio.den,
00684                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
00685             } 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.
00686                 av_reduce(&st->sample_aspect_ratio.num,
00687                           &st->sample_aspect_ratio.den,
00688                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
00689 
00690 //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);
00691 
00692             // copy and convert language codes to the frontend
00693             if (asf->streams[i].stream_language_index < 128) {
00694                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00695                 if (rfc1766 && strlen(rfc1766) > 1) {
00696                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00697                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00698                     if (iso6392)
00699                         av_dict_set(&st->metadata, "language", iso6392, 0);
00700                 }
00701             }
00702         }
00703     }
00704 
00705     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00706 
00707     return 0;
00708 }
00709 
00710 #define DO_2BITS(bits, var, defval) \
00711     switch (bits & 3) \
00712     { \
00713     case 3: var = avio_rl32(pb); rsize += 4; break; \
00714     case 2: var = avio_rl16(pb); rsize += 2; break; \
00715     case 1: var = avio_r8(pb);   rsize++; break; \
00716     default: var = defval; break; \
00717     }
00718 
00725 static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
00726 {
00727     ASFContext *asf = s->priv_data;
00728     uint32_t packet_length, padsize;
00729     int rsize = 8;
00730     int c, d, e, off;
00731 
00732     // if we do not know packet size, allow skipping up to 32 kB
00733     off= 32768;
00734     if (s->packet_size > 0)
00735         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
00736 
00737     c=d=e=-1;
00738     while(off-- > 0){
00739         c=d; d=e;
00740         e= avio_r8(pb);
00741         if(c == 0x82 && !d && !e)
00742             break;
00743     }
00744 
00745     if (c != 0x82) {
00752         if (pb->error == AVERROR(EAGAIN))
00753             return AVERROR(EAGAIN);
00754         if (!pb->eof_reached)
00755             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
00756     }
00757     if ((c & 0x8f) == 0x82) {
00758         if (d || e) {
00759             if (!pb->eof_reached)
00760                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00761             return -1;
00762         }
00763         c= avio_r8(pb);
00764         d= avio_r8(pb);
00765         rsize+=3;
00766     } else if (!pb->eof_reached) {
00767         avio_seek(pb, -1, SEEK_CUR); //FIXME
00768     }
00769 
00770     asf->packet_flags    = c;
00771     asf->packet_property = d;
00772 
00773     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00774     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00775     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00776 
00777     //the following checks prevent overflows and infinite loops
00778     if(!packet_length || packet_length >= (1U<<29)){
00779         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
00780         return -1;
00781     }
00782     if(padsize >= packet_length){
00783         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
00784         return -1;
00785     }
00786 
00787     asf->packet_timestamp = avio_rl32(pb);
00788     avio_rl16(pb); /* duration */
00789     // rsize has at least 11 bytes which have to be present
00790 
00791     if (asf->packet_flags & 0x01) {
00792         asf->packet_segsizetype = avio_r8(pb); rsize++;
00793         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00794     } else {
00795         asf->packet_segments = 1;
00796         asf->packet_segsizetype = 0x80;
00797     }
00798     if (rsize > packet_length - padsize) {
00799         asf->packet_size_left = 0;
00800         av_log(s, AV_LOG_ERROR,
00801                "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
00802                rsize, packet_length, padsize, avio_tell(pb));
00803         return -1;
00804     }
00805     asf->packet_size_left = packet_length - padsize - rsize;
00806     if (packet_length < asf->hdr.min_pktsize)
00807         padsize += asf->hdr.min_pktsize - packet_length;
00808     asf->packet_padsize = padsize;
00809     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00810     return 0;
00811 }
00812 
00817 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
00818     ASFContext *asf = s->priv_data;
00819     int rsize = 1;
00820     int num = avio_r8(pb);
00821     int64_t ts0;
00822 
00823     asf->packet_segments--;
00824     asf->packet_key_frame = num >> 7;
00825     asf->stream_index = asf->asfid2avid[num & 0x7f];
00826     // sequence should be ignored!
00827     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00828     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00829     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00830 //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);
00831     if (asf->packet_replic_size >= 8) {
00832         asf->packet_obj_size = avio_rl32(pb);
00833         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00834             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00835             return -1;
00836         }
00837         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
00838         if(asf->packet_replic_size >= 8+38+4){
00839 //            for(i=0; i<asf->packet_replic_size-8; i++)
00840 //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
00841 //            av_log(s, AV_LOG_DEBUG, "\n");
00842             avio_skip(pb, 10);
00843             ts0= avio_rl64(pb);
00844             avio_skip(pb, 8);;
00845             avio_skip(pb, 12);
00846             avio_rl32(pb);
00847             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
00848             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00849             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00850         }else
00851             avio_skip(pb, asf->packet_replic_size - 8);
00852         rsize += asf->packet_replic_size; // FIXME - check validity
00853     } else if (asf->packet_replic_size==1){
00854         // multipacket - frag_offset is beginning timestamp
00855         asf->packet_time_start = asf->packet_frag_offset;
00856         asf->packet_frag_offset = 0;
00857         asf->packet_frag_timestamp = asf->packet_timestamp;
00858 
00859         asf->packet_time_delta = avio_r8(pb);
00860         rsize++;
00861     }else if(asf->packet_replic_size!=0){
00862         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00863         return -1;
00864     }
00865     if (asf->packet_flags & 0x01) {
00866         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00867         if (rsize > asf->packet_size_left) {
00868             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00869             return -1;
00870         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
00871             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
00872                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
00873                 return -1;
00874             } else {
00875                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
00876                 asf->packet_size_left += diff;
00877                 asf->packet_padsize   -= diff;
00878             }
00879         }
00880         //printf("Fragsize %d\n", asf->packet_frag_size);
00881     } else {
00882         if (rsize > asf->packet_size_left) {
00883             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00884             return -1;
00885         }
00886         asf->packet_frag_size = asf->packet_size_left - rsize;
00887         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00888     }
00889     if (asf->packet_replic_size == 1) {
00890         asf->packet_multi_size = asf->packet_frag_size;
00891         if (asf->packet_multi_size > asf->packet_size_left)
00892             return -1;
00893     }
00894     asf->packet_size_left -= rsize;
00895     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00896 
00897     return 0;
00898 }
00899 
00909 static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
00910 {
00911     ASFContext *asf = s->priv_data;
00912     ASFStream *asf_st = 0;
00913     for (;;) {
00914         int ret;
00915         if(pb->eof_reached)
00916             return AVERROR_EOF;
00917         if (asf->packet_size_left < FRAME_HEADER_SIZE
00918             || asf->packet_segments < 1) {
00919             //asf->packet_size_left <= asf->packet_padsize) {
00920             int ret = asf->packet_size_left + asf->packet_padsize;
00921             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));
00922             assert(ret>=0);
00923             /* fail safe */
00924             avio_skip(pb, ret);
00925 
00926             asf->packet_pos= avio_tell(pb);
00927             if (asf->data_object_size != (uint64_t)-1 &&
00928                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00929                 return AVERROR_EOF; /* Do not exceed the size of the data object */
00930             return 1;
00931         }
00932         if (asf->packet_time_start == 0) {
00933             if(asf_read_frame_header(s, pb) < 0){
00934                 asf->packet_segments= 0;
00935                 continue;
00936             }
00937             if (asf->stream_index < 0
00938                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00939                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00940                 ) {
00941                 asf->packet_time_start = 0;
00942                 /* unhandled packet (should not happen) */
00943                 avio_skip(pb, asf->packet_frag_size);
00944                 asf->packet_size_left -= asf->packet_frag_size;
00945                 if(asf->stream_index < 0)
00946                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00947                 continue;
00948             }
00949             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00950         }
00951         asf_st = asf->asf_st;
00952 
00953         if (asf->packet_replic_size == 1) {
00954             // frag_offset is here used as the beginning timestamp
00955             asf->packet_frag_timestamp = asf->packet_time_start;
00956             asf->packet_time_start += asf->packet_time_delta;
00957             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
00958             asf->packet_size_left--;
00959             asf->packet_multi_size--;
00960             if (asf->packet_multi_size < asf->packet_obj_size)
00961             {
00962                 asf->packet_time_start = 0;
00963                 avio_skip(pb, asf->packet_multi_size);
00964                 asf->packet_size_left -= asf->packet_multi_size;
00965                 continue;
00966             }
00967             asf->packet_multi_size -= asf->packet_obj_size;
00968             //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);
00969         }
00970         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00971               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00972            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00973             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00974                 asf_st->frag_offset, asf->packet_frag_size,
00975                 asf->packet_obj_size, asf_st->pkt.size);
00976             asf->packet_obj_size= asf_st->pkt.size;
00977         }
00978 
00979         if (   asf_st->pkt.size != asf->packet_obj_size
00980             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00981             if(asf_st->pkt.data){
00982                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00983                 asf_st->frag_offset = 0;
00984                 av_free_packet(&asf_st->pkt);
00985             }
00986             /* new packet */
00987             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00988             asf_st->seq = asf->packet_seq;
00989             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
00990             asf_st->pkt.stream_index = asf->stream_index;
00991             asf_st->pkt.pos =
00992             asf_st->packet_pos= asf->packet_pos;
00993             if (asf_st->pkt.data && asf_st->palette_changed) {
00994                 uint8_t *pal;
00995                 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
00996                                               AVPALETTE_SIZE);
00997                 if (!pal) {
00998                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
00999                 } else {
01000                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
01001                     asf_st->palette_changed = 0;
01002                 }
01003             }
01004 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
01005 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
01006 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
01007             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
01008                 asf->packet_key_frame = 1;
01009             if (asf->packet_key_frame)
01010                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
01011         }
01012 
01013         /* read data */
01014         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
01015         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
01016         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
01017         asf->packet_size_left -= asf->packet_frag_size;
01018         if (asf->packet_size_left < 0)
01019             continue;
01020 
01021         if(   asf->packet_frag_offset >= asf_st->pkt.size
01022            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
01023             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
01024                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
01025             continue;
01026         }
01027 
01028         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
01029                          asf->packet_frag_size);
01030         if (ret != asf->packet_frag_size) {
01031             if (ret < 0 || asf->packet_frag_offset + ret == 0)
01032                 return ret < 0 ? ret : AVERROR_EOF;
01033             if (asf_st->ds_span > 1) {
01034                 // scrambling, we can either drop it completely or fill the remainder
01035                 // TODO: should we fill the whole packet instead of just the current
01036                 // fragment?
01037                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
01038                        asf->packet_frag_size - ret);
01039                 ret = asf->packet_frag_size;
01040             } else
01041                 // no scrambling, so we can return partial packets
01042                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
01043         }
01044         if (s->key && s->keylen == 20)
01045             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
01046                             ret);
01047         asf_st->frag_offset += ret;
01048         /* test if whole packet is read */
01049         if (asf_st->frag_offset == asf_st->pkt.size) {
01050             //workaround for macroshit radio DVR-MS files
01051             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
01052                && asf_st->pkt.size > 100){
01053                 int i;
01054                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
01055                 if(i == asf_st->pkt.size){
01056                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
01057                     asf_st->frag_offset = 0;
01058                     av_free_packet(&asf_st->pkt);
01059                     continue;
01060                 }
01061             }
01062 
01063             /* return packet */
01064             if (asf_st->ds_span > 1) {
01065               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
01066                     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);
01067               }else{
01068                 /* packet descrambling */
01069                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
01070                 if (newdata) {
01071                     int offset = 0;
01072                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
01073                     while (offset < asf_st->pkt.size) {
01074                         int off = offset / asf_st->ds_chunk_size;
01075                         int row = off / asf_st->ds_span;
01076                         int col = off % asf_st->ds_span;
01077                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
01078                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
01079 
01080                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
01081                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
01082                         memcpy(newdata + offset,
01083                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
01084                                asf_st->ds_chunk_size);
01085                         offset += asf_st->ds_chunk_size;
01086                     }
01087                     av_free(asf_st->pkt.data);
01088                     asf_st->pkt.data = newdata;
01089                 }
01090               }
01091             }
01092             asf_st->frag_offset = 0;
01093             *pkt= asf_st->pkt;
01094             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
01095             asf_st->pkt.size = 0;
01096             asf_st->pkt.data = 0;
01097             asf_st->pkt.side_data_elems = 0;
01098             asf_st->pkt.side_data = NULL;
01099             break; // packet completed
01100         }
01101     }
01102     return 0;
01103 }
01104 
01105 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
01106 {
01107     ASFContext *asf = s->priv_data;
01108 
01109     for (;;) {
01110         int ret;
01111 
01112         /* parse cached packets, if any */
01113         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
01114             return ret;
01115         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
01116             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
01117         asf->packet_time_start = 0;
01118     }
01119 }
01120 
01121 // Added to support seeking after packets have been read
01122 // If information is not reset, read_packet fails due to
01123 // leftover information from previous reads
01124 static void asf_reset_header(AVFormatContext *s)
01125 {
01126     ASFContext *asf = s->priv_data;
01127     ASFStream *asf_st;
01128     int i;
01129 
01130     asf->packet_size_left = 0;
01131     asf->packet_segments = 0;
01132     asf->packet_flags = 0;
01133     asf->packet_property = 0;
01134     asf->packet_timestamp = 0;
01135     asf->packet_segsizetype = 0;
01136     asf->packet_segments = 0;
01137     asf->packet_seq = 0;
01138     asf->packet_replic_size = 0;
01139     asf->packet_key_frame = 0;
01140     asf->packet_padsize = 0;
01141     asf->packet_frag_offset = 0;
01142     asf->packet_frag_size = 0;
01143     asf->packet_frag_timestamp = 0;
01144     asf->packet_multi_size = 0;
01145     asf->packet_obj_size = 0;
01146     asf->packet_time_delta = 0;
01147     asf->packet_time_start = 0;
01148 
01149     for(i=0; i<s->nb_streams; i++){
01150         asf_st= s->streams[i]->priv_data;
01151         av_free_packet(&asf_st->pkt);
01152         asf_st->frag_offset=0;
01153         asf_st->seq=0;
01154     }
01155     asf->asf_st= NULL;
01156 }
01157 
01158 static int asf_read_close(AVFormatContext *s)
01159 {
01160     asf_reset_header(s);
01161 
01162     return 0;
01163 }
01164 
01165 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01166 {
01167     AVPacket pkt1, *pkt = &pkt1;
01168     ASFStream *asf_st;
01169     int64_t pts;
01170     int64_t pos= *ppos;
01171     int i;
01172     int64_t start_pos[ASF_MAX_STREAMS];
01173 
01174     for(i=0; i<s->nb_streams; i++){
01175         start_pos[i]= pos;
01176     }
01177 
01178     if (s->packet_size > 0)
01179         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01180     *ppos= pos;
01181     avio_seek(s->pb, pos, SEEK_SET);
01182 
01183 //printf("asf_read_pts\n");
01184     asf_reset_header(s);
01185     for(;;){
01186         if (asf_read_packet(s, pkt) < 0){
01187             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01188             return AV_NOPTS_VALUE;
01189         }
01190 
01191         pts = pkt->dts;
01192 
01193         av_free_packet(pkt);
01194         if(pkt->flags&AV_PKT_FLAG_KEY){
01195             i= pkt->stream_index;
01196 
01197             asf_st= s->streams[i]->priv_data;
01198 
01199 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01200             pos= asf_st->packet_pos;
01201 
01202             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01203             start_pos[i]= asf_st->packet_pos + 1;
01204 
01205             if(pkt->stream_index == stream_index)
01206                break;
01207         }
01208     }
01209 
01210     *ppos= pos;
01211 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01212 
01213     return pts;
01214 }
01215 
01216 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01217 {
01218     ff_asf_guid g;
01219     ASFContext *asf = s->priv_data;
01220     int64_t current_pos= avio_tell(s->pb);
01221     int i;
01222 
01223     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
01224     ff_get_guid(s->pb, &g);
01225 
01226     /* the data object can be followed by other top-level objects,
01227        skip them until the simple index object is reached */
01228     while (ff_guidcmp(&g, &index_guid)) {
01229         int64_t gsize= avio_rl64(s->pb);
01230         if (gsize < 24 || s->pb->eof_reached) {
01231             avio_seek(s->pb, current_pos, SEEK_SET);
01232             return;
01233         }
01234         avio_skip(s->pb, gsize-24);
01235         ff_get_guid(s->pb, &g);
01236     }
01237 
01238     {
01239         int64_t itime, last_pos=-1;
01240         int pct, ict;
01241         int64_t av_unused gsize= avio_rl64(s->pb);
01242         ff_get_guid(s->pb, &g);
01243         itime=avio_rl64(s->pb);
01244         pct=avio_rl32(s->pb);
01245         ict=avio_rl32(s->pb);
01246         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01247 
01248         for (i=0;i<ict;i++){
01249             int pktnum=avio_rl32(s->pb);
01250             int pktct =avio_rl16(s->pb);
01251             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01252             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
01253 
01254             if(pos != last_pos){
01255             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);
01256             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01257             last_pos=pos;
01258             }
01259         }
01260         asf->index_read= 1;
01261     }
01262     avio_seek(s->pb, current_pos, SEEK_SET);
01263 }
01264 
01265 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01266 {
01267     ASFContext *asf = s->priv_data;
01268     AVStream *st = s->streams[stream_index];
01269     int64_t pos;
01270     int index;
01271 
01272     if (s->packet_size <= 0)
01273         return -1;
01274 
01275     /* Try using the protocol's read_seek if available */
01276     if(s->pb) {
01277         int ret = avio_seek_time(s->pb, stream_index, pts, flags);
01278         if(ret >= 0)
01279             asf_reset_header(s);
01280         if (ret != AVERROR(ENOSYS))
01281             return ret;
01282     }
01283 
01284     if (!asf->index_read)
01285         asf_build_simple_index(s, stream_index);
01286 
01287     if((asf->index_read && st->index_entries)){
01288         index= av_index_search_timestamp(st, pts, flags);
01289         if(index >= 0) {
01290             /* find the position */
01291             pos = st->index_entries[index].pos;
01292 
01293             /* do the seek */
01294             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01295             avio_seek(s->pb, pos, SEEK_SET);
01296             asf_reset_header(s);
01297             return 0;
01298         }
01299     }
01300     /* no index or seeking by index failed */
01301     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
01302         return -1;
01303     asf_reset_header(s);
01304     return 0;
01305 }
01306 
01307 AVInputFormat ff_asf_demuxer = {
01308     .name           = "asf",
01309     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),
01310     .priv_data_size = sizeof(ASFContext),
01311     .read_probe     = asf_probe,
01312     .read_header    = asf_read_header,
01313     .read_packet    = asf_read_packet,
01314     .read_close     = asf_read_close,
01315     .read_seek      = asf_read_seek,
01316     .read_timestamp = asf_read_pts,
01317     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
01318 };