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             asf_read_stream_properties(s, gsize);
00626         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00627             asf_read_content_desc(s, gsize);
00628         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00629             asf_read_language_list(s, gsize);
00630         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00631             asf_read_ext_content_desc(s, gsize);
00632         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00633             asf_read_metadata(s, gsize);
00634         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00635             asf_read_ext_stream_properties(s, gsize);
00636 
00637             // there could be a optional stream properties object to follow
00638             // if so the next iteration will pick it up
00639             continue;
00640         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00641             ff_get_guid(pb, &g);
00642             avio_skip(pb, 6);
00643             continue;
00644         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00645             asf_read_marker(s, gsize);
00646         } else if (pb->eof_reached) {
00647             return -1;
00648         } else {
00649             if (!s->keylen) {
00650                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00651                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00652                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00653                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00654                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00655                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
00656                 }
00657             }
00658         }
00659         if(avio_tell(pb) != gpos + gsize)
00660             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
00661         avio_seek(pb, gpos + gsize, SEEK_SET);
00662     }
00663     ff_get_guid(pb, &g);
00664     avio_rl64(pb);
00665     avio_r8(pb);
00666     avio_r8(pb);
00667     if (pb->eof_reached)
00668         return -1;
00669     asf->data_offset = avio_tell(pb);
00670     asf->packet_size_left = 0;
00671 
00672 
00673     for(i=0; i<128; i++){
00674         int stream_num= asf->asfid2avid[i];
00675         if(stream_num>=0){
00676             AVStream *st = s->streams[stream_num];
00677             if (!st->codec->bit_rate)
00678                 st->codec->bit_rate = asf->stream_bitrates[i];
00679             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
00680                 av_reduce(&st->sample_aspect_ratio.num,
00681                           &st->sample_aspect_ratio.den,
00682                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
00683             } 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.
00684                 av_reduce(&st->sample_aspect_ratio.num,
00685                           &st->sample_aspect_ratio.den,
00686                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
00687 
00688 //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);
00689 
00690             // copy and convert language codes to the frontend
00691             if (asf->streams[i].stream_language_index < 128) {
00692                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00693                 if (rfc1766 && strlen(rfc1766) > 1) {
00694                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00695                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00696                     if (iso6392)
00697                         av_dict_set(&st->metadata, "language", iso6392, 0);
00698                 }
00699             }
00700         }
00701     }
00702 
00703     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00704 
00705     return 0;
00706 }
00707 
00708 #define DO_2BITS(bits, var, defval) \
00709     switch (bits & 3) \
00710     { \
00711     case 3: var = avio_rl32(pb); rsize += 4; break; \
00712     case 2: var = avio_rl16(pb); rsize += 2; break; \
00713     case 1: var = avio_r8(pb);   rsize++; break; \
00714     default: var = defval; break; \
00715     }
00716 
00723 static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
00724 {
00725     ASFContext *asf = s->priv_data;
00726     uint32_t packet_length, padsize;
00727     int rsize = 8;
00728     int c, d, e, off;
00729 
00730     // if we do not know packet size, allow skipping up to 32 kB
00731     off= 32768;
00732     if (s->packet_size > 0)
00733         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
00734 
00735     c=d=e=-1;
00736     while(off-- > 0){
00737         c=d; d=e;
00738         e= avio_r8(pb);
00739         if(c == 0x82 && !d && !e)
00740             break;
00741     }
00742 
00743     if (c != 0x82) {
00750         if (pb->error == AVERROR(EAGAIN))
00751             return AVERROR(EAGAIN);
00752         if (!pb->eof_reached)
00753             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
00754     }
00755     if ((c & 0x8f) == 0x82) {
00756         if (d || e) {
00757             if (!pb->eof_reached)
00758                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00759             return -1;
00760         }
00761         c= avio_r8(pb);
00762         d= avio_r8(pb);
00763         rsize+=3;
00764     } else if (!pb->eof_reached) {
00765         avio_seek(pb, -1, SEEK_CUR); //FIXME
00766     }
00767 
00768     asf->packet_flags    = c;
00769     asf->packet_property = d;
00770 
00771     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00772     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00773     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00774 
00775     //the following checks prevent overflows and infinite loops
00776     if(!packet_length || packet_length >= (1U<<29)){
00777         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
00778         return -1;
00779     }
00780     if(padsize >= packet_length){
00781         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
00782         return -1;
00783     }
00784 
00785     asf->packet_timestamp = avio_rl32(pb);
00786     avio_rl16(pb); /* duration */
00787     // rsize has at least 11 bytes which have to be present
00788 
00789     if (asf->packet_flags & 0x01) {
00790         asf->packet_segsizetype = avio_r8(pb); rsize++;
00791         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00792     } else {
00793         asf->packet_segments = 1;
00794         asf->packet_segsizetype = 0x80;
00795     }
00796     if (rsize > packet_length - padsize) {
00797         asf->packet_size_left = 0;
00798         av_log(s, AV_LOG_ERROR,
00799                "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
00800                rsize, packet_length, padsize, avio_tell(pb));
00801         return -1;
00802     }
00803     asf->packet_size_left = packet_length - padsize - rsize;
00804     if (packet_length < asf->hdr.min_pktsize)
00805         padsize += asf->hdr.min_pktsize - packet_length;
00806     asf->packet_padsize = padsize;
00807     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00808     return 0;
00809 }
00810 
00815 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
00816     ASFContext *asf = s->priv_data;
00817     int rsize = 1;
00818     int num = avio_r8(pb);
00819     int64_t ts0;
00820 
00821     asf->packet_segments--;
00822     asf->packet_key_frame = num >> 7;
00823     asf->stream_index = asf->asfid2avid[num & 0x7f];
00824     // sequence should be ignored!
00825     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00826     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00827     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00828 //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);
00829     if (asf->packet_replic_size >= 8) {
00830         asf->packet_obj_size = avio_rl32(pb);
00831         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00832             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00833             return -1;
00834         }
00835         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
00836         if(asf->packet_replic_size >= 8+38+4){
00837 //            for(i=0; i<asf->packet_replic_size-8; i++)
00838 //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
00839 //            av_log(s, AV_LOG_DEBUG, "\n");
00840             avio_skip(pb, 10);
00841             ts0= avio_rl64(pb);
00842             avio_skip(pb, 8);;
00843             avio_skip(pb, 12);
00844             avio_rl32(pb);
00845             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
00846             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00847             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00848         }else
00849             avio_skip(pb, asf->packet_replic_size - 8);
00850         rsize += asf->packet_replic_size; // FIXME - check validity
00851     } else if (asf->packet_replic_size==1){
00852         // multipacket - frag_offset is beginning timestamp
00853         asf->packet_time_start = asf->packet_frag_offset;
00854         asf->packet_frag_offset = 0;
00855         asf->packet_frag_timestamp = asf->packet_timestamp;
00856 
00857         asf->packet_time_delta = avio_r8(pb);
00858         rsize++;
00859     }else if(asf->packet_replic_size!=0){
00860         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00861         return -1;
00862     }
00863     if (asf->packet_flags & 0x01) {
00864         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00865         if (rsize > asf->packet_size_left) {
00866             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00867             return -1;
00868         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
00869             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
00870                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
00871                 return -1;
00872             } else {
00873                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
00874                 asf->packet_size_left += diff;
00875                 asf->packet_padsize   -= diff;
00876             }
00877         }
00878         //printf("Fragsize %d\n", asf->packet_frag_size);
00879     } else {
00880         if (rsize > asf->packet_size_left) {
00881             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00882             return -1;
00883         }
00884         asf->packet_frag_size = asf->packet_size_left - rsize;
00885         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00886     }
00887     if (asf->packet_replic_size == 1) {
00888         asf->packet_multi_size = asf->packet_frag_size;
00889         if (asf->packet_multi_size > asf->packet_size_left)
00890             return -1;
00891     }
00892     asf->packet_size_left -= rsize;
00893     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00894 
00895     return 0;
00896 }
00897 
00907 static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
00908 {
00909     ASFContext *asf = s->priv_data;
00910     ASFStream *asf_st = 0;
00911     for (;;) {
00912         int ret;
00913         if(pb->eof_reached)
00914             return AVERROR_EOF;
00915         if (asf->packet_size_left < FRAME_HEADER_SIZE
00916             || asf->packet_segments < 1) {
00917             //asf->packet_size_left <= asf->packet_padsize) {
00918             int ret = asf->packet_size_left + asf->packet_padsize;
00919             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));
00920             assert(ret>=0);
00921             /* fail safe */
00922             avio_skip(pb, ret);
00923 
00924             asf->packet_pos= avio_tell(pb);
00925             if (asf->data_object_size != (uint64_t)-1 &&
00926                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00927                 return AVERROR_EOF; /* Do not exceed the size of the data object */
00928             return 1;
00929         }
00930         if (asf->packet_time_start == 0) {
00931             if(asf_read_frame_header(s, pb) < 0){
00932                 asf->packet_segments= 0;
00933                 continue;
00934             }
00935             if (asf->stream_index < 0
00936                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00937                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00938                 ) {
00939                 asf->packet_time_start = 0;
00940                 /* unhandled packet (should not happen) */
00941                 avio_skip(pb, asf->packet_frag_size);
00942                 asf->packet_size_left -= asf->packet_frag_size;
00943                 if(asf->stream_index < 0)
00944                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00945                 continue;
00946             }
00947             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00948         }
00949         asf_st = asf->asf_st;
00950 
00951         if (asf->packet_replic_size == 1) {
00952             // frag_offset is here used as the beginning timestamp
00953             asf->packet_frag_timestamp = asf->packet_time_start;
00954             asf->packet_time_start += asf->packet_time_delta;
00955             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
00956             asf->packet_size_left--;
00957             asf->packet_multi_size--;
00958             if (asf->packet_multi_size < asf->packet_obj_size)
00959             {
00960                 asf->packet_time_start = 0;
00961                 avio_skip(pb, asf->packet_multi_size);
00962                 asf->packet_size_left -= asf->packet_multi_size;
00963                 continue;
00964             }
00965             asf->packet_multi_size -= asf->packet_obj_size;
00966             //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);
00967         }
00968         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00969               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00970            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00971             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00972                 asf_st->frag_offset, asf->packet_frag_size,
00973                 asf->packet_obj_size, asf_st->pkt.size);
00974             asf->packet_obj_size= asf_st->pkt.size;
00975         }
00976 
00977         if (   asf_st->pkt.size != asf->packet_obj_size
00978             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00979             if(asf_st->pkt.data){
00980                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00981                 asf_st->frag_offset = 0;
00982                 av_free_packet(&asf_st->pkt);
00983             }
00984             /* new packet */
00985             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00986             asf_st->seq = asf->packet_seq;
00987             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
00988             asf_st->pkt.stream_index = asf->stream_index;
00989             asf_st->pkt.pos =
00990             asf_st->packet_pos= asf->packet_pos;
00991             if (asf_st->pkt.data && asf_st->palette_changed) {
00992                 uint8_t *pal;
00993                 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
00994                                               AVPALETTE_SIZE);
00995                 if (!pal) {
00996                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
00997                 } else {
00998                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
00999                     asf_st->palette_changed = 0;
01000                 }
01001             }
01002 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
01003 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
01004 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
01005             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
01006                 asf->packet_key_frame = 1;
01007             if (asf->packet_key_frame)
01008                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
01009         }
01010 
01011         /* read data */
01012         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
01013         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
01014         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
01015         asf->packet_size_left -= asf->packet_frag_size;
01016         if (asf->packet_size_left < 0)
01017             continue;
01018 
01019         if(   asf->packet_frag_offset >= asf_st->pkt.size
01020            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
01021             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
01022                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
01023             continue;
01024         }
01025 
01026         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
01027                          asf->packet_frag_size);
01028         if (ret != asf->packet_frag_size) {
01029             if (ret < 0 || asf->packet_frag_offset + ret == 0)
01030                 return ret < 0 ? ret : AVERROR_EOF;
01031             if (asf_st->ds_span > 1) {
01032                 // scrambling, we can either drop it completely or fill the remainder
01033                 // TODO: should we fill the whole packet instead of just the current
01034                 // fragment?
01035                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
01036                        asf->packet_frag_size - ret);
01037                 ret = asf->packet_frag_size;
01038             } else
01039                 // no scrambling, so we can return partial packets
01040                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
01041         }
01042         if (s->key && s->keylen == 20)
01043             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
01044                             ret);
01045         asf_st->frag_offset += ret;
01046         /* test if whole packet is read */
01047         if (asf_st->frag_offset == asf_st->pkt.size) {
01048             //workaround for macroshit radio DVR-MS files
01049             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
01050                && asf_st->pkt.size > 100){
01051                 int i;
01052                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
01053                 if(i == asf_st->pkt.size){
01054                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
01055                     asf_st->frag_offset = 0;
01056                     av_free_packet(&asf_st->pkt);
01057                     continue;
01058                 }
01059             }
01060 
01061             /* return packet */
01062             if (asf_st->ds_span > 1) {
01063               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
01064                     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);
01065               }else{
01066                 /* packet descrambling */
01067                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
01068                 if (newdata) {
01069                     int offset = 0;
01070                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
01071                     while (offset < asf_st->pkt.size) {
01072                         int off = offset / asf_st->ds_chunk_size;
01073                         int row = off / asf_st->ds_span;
01074                         int col = off % asf_st->ds_span;
01075                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
01076                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
01077 
01078                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
01079                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
01080                         memcpy(newdata + offset,
01081                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
01082                                asf_st->ds_chunk_size);
01083                         offset += asf_st->ds_chunk_size;
01084                     }
01085                     av_free(asf_st->pkt.data);
01086                     asf_st->pkt.data = newdata;
01087                 }
01088               }
01089             }
01090             asf_st->frag_offset = 0;
01091             *pkt= asf_st->pkt;
01092             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
01093             asf_st->pkt.size = 0;
01094             asf_st->pkt.data = 0;
01095             asf_st->pkt.side_data_elems = 0;
01096             asf_st->pkt.side_data = NULL;
01097             break; // packet completed
01098         }
01099     }
01100     return 0;
01101 }
01102 
01103 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
01104 {
01105     ASFContext *asf = s->priv_data;
01106 
01107     for (;;) {
01108         int ret;
01109 
01110         /* parse cached packets, if any */
01111         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
01112             return ret;
01113         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
01114             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
01115         asf->packet_time_start = 0;
01116     }
01117 }
01118 
01119 // Added to support seeking after packets have been read
01120 // If information is not reset, read_packet fails due to
01121 // leftover information from previous reads
01122 static void asf_reset_header(AVFormatContext *s)
01123 {
01124     ASFContext *asf = s->priv_data;
01125     ASFStream *asf_st;
01126     int i;
01127 
01128     asf->packet_size_left = 0;
01129     asf->packet_segments = 0;
01130     asf->packet_flags = 0;
01131     asf->packet_property = 0;
01132     asf->packet_timestamp = 0;
01133     asf->packet_segsizetype = 0;
01134     asf->packet_segments = 0;
01135     asf->packet_seq = 0;
01136     asf->packet_replic_size = 0;
01137     asf->packet_key_frame = 0;
01138     asf->packet_padsize = 0;
01139     asf->packet_frag_offset = 0;
01140     asf->packet_frag_size = 0;
01141     asf->packet_frag_timestamp = 0;
01142     asf->packet_multi_size = 0;
01143     asf->packet_obj_size = 0;
01144     asf->packet_time_delta = 0;
01145     asf->packet_time_start = 0;
01146 
01147     for(i=0; i<s->nb_streams; i++){
01148         asf_st= s->streams[i]->priv_data;
01149         av_free_packet(&asf_st->pkt);
01150         asf_st->frag_offset=0;
01151         asf_st->seq=0;
01152     }
01153     asf->asf_st= NULL;
01154 }
01155 
01156 static int asf_read_close(AVFormatContext *s)
01157 {
01158     asf_reset_header(s);
01159 
01160     return 0;
01161 }
01162 
01163 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01164 {
01165     AVPacket pkt1, *pkt = &pkt1;
01166     ASFStream *asf_st;
01167     int64_t pts;
01168     int64_t pos= *ppos;
01169     int i;
01170     int64_t start_pos[ASF_MAX_STREAMS];
01171 
01172     for(i=0; i<s->nb_streams; i++){
01173         start_pos[i]= pos;
01174     }
01175 
01176     if (s->packet_size > 0)
01177         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01178     *ppos= pos;
01179     avio_seek(s->pb, pos, SEEK_SET);
01180 
01181 //printf("asf_read_pts\n");
01182     asf_reset_header(s);
01183     for(;;){
01184         if (asf_read_packet(s, pkt) < 0){
01185             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01186             return AV_NOPTS_VALUE;
01187         }
01188 
01189         pts = pkt->dts;
01190 
01191         av_free_packet(pkt);
01192         if(pkt->flags&AV_PKT_FLAG_KEY){
01193             i= pkt->stream_index;
01194 
01195             asf_st= s->streams[i]->priv_data;
01196 
01197 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01198             pos= asf_st->packet_pos;
01199 
01200             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01201             start_pos[i]= asf_st->packet_pos + 1;
01202 
01203             if(pkt->stream_index == stream_index)
01204                break;
01205         }
01206     }
01207 
01208     *ppos= pos;
01209 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01210 
01211     return pts;
01212 }
01213 
01214 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01215 {
01216     ff_asf_guid g;
01217     ASFContext *asf = s->priv_data;
01218     int64_t current_pos= avio_tell(s->pb);
01219     int i;
01220 
01221     avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
01222     ff_get_guid(s->pb, &g);
01223 
01224     /* the data object can be followed by other top-level objects,
01225        skip them until the simple index object is reached */
01226     while (ff_guidcmp(&g, &index_guid)) {
01227         int64_t gsize= avio_rl64(s->pb);
01228         if (gsize < 24 || s->pb->eof_reached) {
01229             avio_seek(s->pb, current_pos, SEEK_SET);
01230             return;
01231         }
01232         avio_skip(s->pb, gsize-24);
01233         ff_get_guid(s->pb, &g);
01234     }
01235 
01236     {
01237         int64_t itime, last_pos=-1;
01238         int pct, ict;
01239         int64_t av_unused gsize= avio_rl64(s->pb);
01240         ff_get_guid(s->pb, &g);
01241         itime=avio_rl64(s->pb);
01242         pct=avio_rl32(s->pb);
01243         ict=avio_rl32(s->pb);
01244         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01245 
01246         for (i=0;i<ict;i++){
01247             int pktnum=avio_rl32(s->pb);
01248             int pktct =avio_rl16(s->pb);
01249             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01250             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
01251 
01252             if(pos != last_pos){
01253             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);
01254             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01255             last_pos=pos;
01256             }
01257         }
01258         asf->index_read= 1;
01259     }
01260     avio_seek(s->pb, current_pos, SEEK_SET);
01261 }
01262 
01263 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01264 {
01265     ASFContext *asf = s->priv_data;
01266     AVStream *st = s->streams[stream_index];
01267     int64_t pos;
01268     int index;
01269 
01270     if (s->packet_size <= 0)
01271         return -1;
01272 
01273     /* Try using the protocol's read_seek if available */
01274     if(s->pb) {
01275         int ret = avio_seek_time(s->pb, stream_index, pts, flags);
01276         if(ret >= 0)
01277             asf_reset_header(s);
01278         if (ret != AVERROR(ENOSYS))
01279             return ret;
01280     }
01281 
01282     if (!asf->index_read)
01283         asf_build_simple_index(s, stream_index);
01284 
01285     if((asf->index_read && st->index_entries)){
01286         index= av_index_search_timestamp(st, pts, flags);
01287         if(index >= 0) {
01288             /* find the position */
01289             pos = st->index_entries[index].pos;
01290 
01291             /* do the seek */
01292             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01293             avio_seek(s->pb, pos, SEEK_SET);
01294             asf_reset_header(s);
01295             return 0;
01296         }
01297     }
01298     /* no index or seeking by index failed */
01299     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
01300         return -1;
01301     asf_reset_header(s);
01302     return 0;
01303 }
01304 
01305 AVInputFormat ff_asf_demuxer = {
01306     .name           = "asf",
01307     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),
01308     .priv_data_size = sizeof(ASFContext),
01309     .read_probe     = asf_probe,
01310     .read_header    = asf_read_header,
01311     .read_packet    = asf_read_packet,
01312     .read_close     = asf_read_close,
01313     .read_seek      = asf_read_seek,
01314     .read_timestamp = asf_read_pts,
01315     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
01316 };