FFmpeg: libavformat/asfdec.c Source File

00001 /*
00002  * ASF compatible demuxer
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 //#define DEBUG
00023 
00024 #include "libavutil/bswap.h"
00025 #include "libavutil/common.h"
00026 #include "libavutil/avstring.h"
00027 #include "libavutil/dict.h"
00028 #include "libavutil/mathematics.h"
00029 #include "libavutil/opt.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     const AVClass *class;
00040     int asfid2avid[128];                 
00041     ASFStream streams[128];              
00042     uint32_t stream_bitrates[128];       
00043     AVRational dar[128];
00044     char stream_languages[128][6];       
00045     /* non streamed additonnal info */
00046     /* packet filling */
00047     int packet_size_left;
00048     /* only for reading */
00049     uint64_t data_offset;                
00050     uint64_t data_object_offset;         
00051     uint64_t data_object_size;           
00052     int index_read;
00053 
00054     ASFMainHeader hdr;
00055 
00056     int packet_flags;
00057     int packet_property;
00058     int packet_timestamp;
00059     int packet_segsizetype;
00060     int packet_segments;
00061     int packet_seq;
00062     int packet_replic_size;
00063     int packet_key_frame;
00064     int packet_padsize;
00065     unsigned int packet_frag_offset;
00066     unsigned int packet_frag_size;
00067     int64_t packet_frag_timestamp;
00068     int packet_multi_size;
00069     int packet_obj_size;
00070     int packet_time_delta;
00071     int packet_time_start;
00072     int64_t packet_pos;
00073 
00074     int stream_index;
00075 
00076     ASFStream* asf_st;                   
00077 
00078     int no_resync_search;
00079 } ASFContext;
00080 
00081 static const AVOption options[] = {
00082     {"no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_INT, {.dbl = 0}, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
00083     { NULL },
00084 };
00085 
00086 static const AVClass asf_class = {
00087     .class_name = "asf demuxer",
00088     .item_name  = av_default_item_name,
00089     .option     = options,
00090     .version    = LIBAVUTIL_VERSION_INT,
00091 };
00092 
00093 #undef NDEBUG
00094 #include <assert.h>
00095 
00096 #define ASF_MAX_STREAMS 127
00097 #define FRAME_HEADER_SIZE 17
00098 // Fix Me! FRAME_HEADER_SIZE may be different.
00099 
00100 #ifdef DEBUG
00101 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
00102     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
00103 };
00104 
00105 #define PRINT_IF_GUID(g,cmp) \
00106 if (!ff_guidcmp(g, &cmp)) \
00107     av_dlog(NULL, "(GUID: %s) ", #cmp)
00108 
00109 static void print_guid(const ff_asf_guid *g)
00110 {
00111     int i;
00112     PRINT_IF_GUID(g, ff_asf_header);
00113     else PRINT_IF_GUID(g, ff_asf_file_header);
00114     else PRINT_IF_GUID(g, ff_asf_stream_header);
00115     else PRINT_IF_GUID(g, ff_asf_audio_stream);
00116     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
00117     else PRINT_IF_GUID(g, ff_asf_video_stream);
00118     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
00119     else PRINT_IF_GUID(g, ff_asf_command_stream);
00120     else PRINT_IF_GUID(g, ff_asf_comment_header);
00121     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
00122     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
00123     else PRINT_IF_GUID(g, ff_asf_data_header);
00124     else PRINT_IF_GUID(g, ff_asf_simple_index_header);
00125     else PRINT_IF_GUID(g, ff_asf_head1_guid);
00126     else PRINT_IF_GUID(g, ff_asf_head2_guid);
00127     else PRINT_IF_GUID(g, ff_asf_my_guid);
00128     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
00129     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
00130     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
00131     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
00132     else PRINT_IF_GUID(g, ff_asf_metadata_header);
00133     else PRINT_IF_GUID(g, ff_asf_marker_header);
00134     else PRINT_IF_GUID(g, stream_bitrate_guid);
00135     else PRINT_IF_GUID(g, ff_asf_language_guid);
00136     else
00137         av_dlog(NULL, "(GUID: unknown) ");
00138     for(i=0;i<16;i++)
00139         av_dlog(NULL, " 0x%02x,", (*g)[i]);
00140     av_dlog(NULL, "}\n");
00141 }
00142 #undef PRINT_IF_GUID
00143 #else
00144 #define print_guid(g)
00145 #endif
00146 
00147 static int asf_probe(AVProbeData *pd)
00148 {
00149     /* check file header */
00150     if (!ff_guidcmp(pd->buf, &ff_asf_header))
00151         return AVPROBE_SCORE_MAX;
00152     else
00153         return 0;
00154 }
00155 
00156 static int get_value(AVIOContext *pb, int type){
00157     switch(type){
00158         case 2: return avio_rl32(pb);
00159         case 3: return avio_rl32(pb);
00160         case 4: return avio_rl64(pb);
00161         case 5: return avio_rl16(pb);
00162         default:return INT_MIN;
00163     }
00164 }
00165 
00166 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
00167 {
00168     char *value;
00169     int64_t off = avio_tell(s->pb);
00170 
00171     if ((unsigned)len >= (UINT_MAX - 1)/2)
00172         return;
00173 
00174     value = av_malloc(2*len+1);
00175     if (!value)
00176         goto finish;
00177 
00178     if (type == 0) {         // UTF16-LE
00179         avio_get_str16le(s->pb, len, value, 2*len + 1);
00180     } else if (type == -1) { // ASCII
00181         avio_read(s->pb, value, len);
00182         value[len]=0;
00183     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
00184         uint64_t num = get_value(s->pb, type);
00185         snprintf(value, len, "%"PRIu64, num);
00186     } else {
00187         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
00188         goto finish;
00189     }
00190     if (*value)
00191         av_dict_set(&s->metadata, key, value, 0);
00192 finish:
00193     av_freep(&value);
00194     avio_seek(s->pb, off + len, SEEK_SET);
00195 }
00196 
00197 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
00198 {
00199     ASFContext *asf = s->priv_data;
00200     AVIOContext *pb = s->pb;
00201 
00202     ff_get_guid(pb, &asf->hdr.guid);
00203     asf->hdr.file_size          = avio_rl64(pb);
00204     asf->hdr.create_time        = avio_rl64(pb);
00205     avio_rl64(pb);                               /* number of packets */
00206     asf->hdr.play_time          = avio_rl64(pb);
00207     asf->hdr.send_time          = avio_rl64(pb);
00208     asf->hdr.preroll            = avio_rl32(pb);
00209     asf->hdr.ignore             = avio_rl32(pb);
00210     asf->hdr.flags              = avio_rl32(pb);
00211     asf->hdr.min_pktsize        = avio_rl32(pb);
00212     asf->hdr.max_pktsize        = avio_rl32(pb);
00213     if (asf->hdr.min_pktsize >= (1U<<29))
00214         return AVERROR_INVALIDDATA;
00215     asf->hdr.max_bitrate        = avio_rl32(pb);
00216     s->packet_size = asf->hdr.max_pktsize;
00217 
00218     return 0;
00219 }
00220 
00221 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
00222 {
00223     ASFContext *asf = s->priv_data;
00224     AVIOContext *pb = s->pb;
00225     AVStream *st;
00226     ASFStream *asf_st;
00227     ff_asf_guid g;
00228     enum AVMediaType type;
00229     int type_specific_size, sizeX;
00230     unsigned int tag1;
00231     int64_t pos1, pos2, start_time;
00232     int test_for_ext_stream_audio, is_dvr_ms_audio=0;
00233 
00234     if (s->nb_streams == ASF_MAX_STREAMS) {
00235         av_log(s, AV_LOG_ERROR, "too many streams\n");
00236         return AVERROR(EINVAL);
00237     }
00238 
00239     pos1 = avio_tell(pb);
00240 
00241     st = avformat_new_stream(s, NULL);
00242     if (!st)
00243         return AVERROR(ENOMEM);
00244     avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00245     asf_st = av_mallocz(sizeof(ASFStream));
00246     if (!asf_st)
00247         return AVERROR(ENOMEM);
00248     st->priv_data = asf_st;
00249     start_time = asf->hdr.preroll;
00250 
00251     asf_st->stream_language_index = 128; // invalid stream index means no language info
00252 
00253     if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00254         st->duration = asf->hdr.play_time /
00255             (10000000 / 1000) - start_time;
00256     }
00257     ff_get_guid(pb, &g);
00258 
00259     test_for_ext_stream_audio = 0;
00260     if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
00261         type = AVMEDIA_TYPE_AUDIO;
00262     } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
00263         type = AVMEDIA_TYPE_VIDEO;
00264     } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
00265         type = AVMEDIA_TYPE_VIDEO;
00266         st->codec->codec_id = CODEC_ID_MJPEG;
00267     } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
00268         type = AVMEDIA_TYPE_DATA;
00269     } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
00270         test_for_ext_stream_audio = 1;
00271         type = AVMEDIA_TYPE_UNKNOWN;
00272     } else {
00273         return -1;
00274     }
00275     ff_get_guid(pb, &g);
00276     avio_skip(pb, 8); /* total_size */
00277     type_specific_size = avio_rl32(pb);
00278     avio_rl32(pb);
00279     st->id = avio_rl16(pb) & 0x7f; /* stream id */
00280     // mapping of asf ID to AV stream ID;
00281     asf->asfid2avid[st->id] = s->nb_streams - 1;
00282 
00283     avio_rl32(pb);
00284 
00285     if (test_for_ext_stream_audio) {
00286         ff_get_guid(pb, &g);
00287         if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
00288             type = AVMEDIA_TYPE_AUDIO;
00289             is_dvr_ms_audio=1;
00290             ff_get_guid(pb, &g);
00291             avio_rl32(pb);
00292             avio_rl32(pb);
00293             avio_rl32(pb);
00294             ff_get_guid(pb, &g);
00295             avio_rl32(pb);
00296         }
00297     }
00298 
00299     st->codec->codec_type = type;
00300     if (type == AVMEDIA_TYPE_AUDIO) {
00301         int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
00302         if (ret < 0)
00303             return ret;
00304         if (is_dvr_ms_audio) {
00305             // codec_id and codec_tag are unreliable in dvr_ms
00306             // files. Set them later by probing stream.
00307             st->request_probe= 1;
00308             st->codec->codec_tag = 0;
00309         }
00310         if (st->codec->codec_id == CODEC_ID_AAC) {
00311             st->need_parsing = AVSTREAM_PARSE_NONE;
00312         } else {
00313             st->need_parsing = AVSTREAM_PARSE_FULL;
00314         }
00315         /* We have to init the frame size at some point .... */
00316         pos2 = avio_tell(pb);
00317         if (size >= (pos2 + 8 - pos1 + 24)) {
00318             asf_st->ds_span = avio_r8(pb);
00319             asf_st->ds_packet_size = avio_rl16(pb);
00320             asf_st->ds_chunk_size = avio_rl16(pb);
00321             avio_rl16(pb); //ds_data_size
00322             avio_r8(pb);   //ds_silence_data
00323         }
00324         //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
00325         //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
00326         //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
00327         if (asf_st->ds_span > 1) {
00328             if (!asf_st->ds_chunk_size
00329                     || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00330                     || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00331                 asf_st->ds_span = 0; // disable descrambling
00332         }
00333     } else if (type == AVMEDIA_TYPE_VIDEO &&
00334             size - (avio_tell(pb) - pos1 + 24) >= 51) {
00335         avio_rl32(pb);
00336         avio_rl32(pb);
00337         avio_r8(pb);
00338         avio_rl16(pb);        /* size */
00339         sizeX= avio_rl32(pb); /* size */
00340         st->codec->width = avio_rl32(pb);
00341         st->codec->height = avio_rl32(pb);
00342         /* not available for asf */
00343         avio_rl16(pb); /* panes */
00344         st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
00345         tag1 = avio_rl32(pb);
00346         avio_skip(pb, 20);
00347         //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
00348         if (sizeX > 40) {
00349             st->codec->extradata_size = sizeX - 40;
00350             st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00351             avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00352         }
00353 
00354         /* Extract palette from extradata if bpp <= 8 */
00355         /* This code assumes that extradata contains only palette */
00356         /* This is true for all paletted codecs implemented in libavcodec */
00357         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00358 #if HAVE_BIGENDIAN
00359             int i;
00360             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00361                 asf_st->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
00362 #else
00363             memcpy(asf_st->palette, st->codec->extradata,
00364                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00365 #endif
00366             asf_st->palette_changed = 1;
00367         }
00368 
00369         st->codec->codec_tag = tag1;
00370         st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00371         if(tag1 == MKTAG('D', 'V', 'R', ' ')){
00372             st->need_parsing = AVSTREAM_PARSE_FULL;
00373             // 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
00374             st->codec->width  =
00375                 st->codec->height = 0;
00376             av_freep(&st->codec->extradata);
00377             st->codec->extradata_size=0;
00378         }
00379         if(st->codec->codec_id == CODEC_ID_H264)
00380             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
00381     }
00382     pos2 = avio_tell(pb);
00383     avio_skip(pb, size - (pos2 - pos1 + 24));
00384 
00385     return 0;
00386 }
00387 
00388 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
00389 {
00390     ASFContext *asf = s->priv_data;
00391     AVIOContext *pb = s->pb;
00392     ff_asf_guid g;
00393     int ext_len, payload_ext_ct, stream_ct, i;
00394     uint32_t leak_rate, stream_num;
00395     unsigned int stream_languageid_index;
00396 
00397     avio_rl64(pb); // starttime
00398     avio_rl64(pb); // endtime
00399     leak_rate = avio_rl32(pb); // leak-datarate
00400     avio_rl32(pb); // bucket-datasize
00401     avio_rl32(pb); // init-bucket-fullness
00402     avio_rl32(pb); // alt-leak-datarate
00403     avio_rl32(pb); // alt-bucket-datasize
00404     avio_rl32(pb); // alt-init-bucket-fullness
00405     avio_rl32(pb); // max-object-size
00406     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00407     stream_num = avio_rl16(pb); // stream-num
00408 
00409     stream_languageid_index = avio_rl16(pb); // stream-language-id-index
00410     if (stream_num < 128)
00411         asf->streams[stream_num].stream_language_index = stream_languageid_index;
00412 
00413     avio_rl64(pb); // avg frametime in 100ns units
00414     stream_ct = avio_rl16(pb); //stream-name-count
00415     payload_ext_ct = avio_rl16(pb); //payload-extension-system-count
00416 
00417     if (stream_num < 128)
00418         asf->stream_bitrates[stream_num] = leak_rate;
00419 
00420     for (i=0; i<stream_ct; i++){
00421         avio_rl16(pb);
00422         ext_len = avio_rl16(pb);
00423         avio_skip(pb, ext_len);
00424     }
00425 
00426     for (i=0; i<payload_ext_ct; i++){
00427         ff_get_guid(pb, &g);
00428         avio_skip(pb, 2);
00429         ext_len=avio_rl32(pb);
00430         avio_skip(pb, ext_len);
00431     }
00432 
00433     return 0;
00434 }
00435 
00436 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
00437 {
00438     AVIOContext *pb = s->pb;
00439     int len1, len2, len3, len4, len5;
00440 
00441     len1 = avio_rl16(pb);
00442     len2 = avio_rl16(pb);
00443     len3 = avio_rl16(pb);
00444     len4 = avio_rl16(pb);
00445     len5 = avio_rl16(pb);
00446     get_tag(s, "title"    , 0, len1);
00447     get_tag(s, "author"   , 0, len2);
00448     get_tag(s, "copyright", 0, len3);
00449     get_tag(s, "comment"  , 0, len4);
00450     avio_skip(pb, len5);
00451 
00452     return 0;
00453 }
00454 
00455 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
00456 {
00457     AVIOContext *pb = s->pb;
00458     ASFContext *asf = s->priv_data;
00459     int desc_count, i, ret;
00460 
00461     desc_count = avio_rl16(pb);
00462     for(i=0;i<desc_count;i++) {
00463         int name_len,value_type,value_len;
00464         char name[1024];
00465 
00466         name_len = avio_rl16(pb);
00467         if (name_len%2)     // must be even, broken lavf versions wrote len-1
00468             name_len += 1;
00469         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00470             avio_skip(pb, name_len - ret);
00471         value_type = avio_rl16(pb);
00472         value_len  = avio_rl16(pb);
00473         if (!value_type && value_len%2)
00474             value_len += 1;
00479         if (!strcmp(name, "AspectRatioX")){
00480             asf->dar[0].num= get_value(s->pb, value_type);
00481         } else if(!strcmp(name, "AspectRatioY")){
00482             asf->dar[0].den= get_value(s->pb, value_type);
00483         } else
00484             get_tag(s, name, value_type, value_len);
00485     }
00486 
00487     return 0;
00488 }
00489 
00490 static int asf_read_language_list(AVFormatContext *s, int64_t size)
00491 {
00492     AVIOContext *pb = s->pb;
00493     ASFContext *asf = s->priv_data;
00494     int j, ret;
00495     int stream_count = avio_rl16(pb);
00496     for(j = 0; j < stream_count; j++) {
00497         char lang[6];
00498         unsigned int lang_len = avio_r8(pb);
00499         if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
00500             avio_skip(pb, lang_len - ret);
00501         if (j < 128)
00502             av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
00503     }
00504 
00505     return 0;
00506 }
00507 
00508 static int asf_read_metadata(AVFormatContext *s, int64_t size)
00509 {
00510     AVIOContext *pb = s->pb;
00511     ASFContext *asf = s->priv_data;
00512     int n, stream_num, name_len, value_len, value_num;
00513     int ret, i;
00514     n = avio_rl16(pb);
00515 
00516     for(i=0;i<n;i++) {
00517         char name[1024];
00518 
00519         avio_rl16(pb); //lang_list_index
00520         stream_num= avio_rl16(pb);
00521         name_len=   avio_rl16(pb);
00522         avio_skip(pb, 2); /* value_type */
00523         value_len=  avio_rl32(pb);
00524 
00525         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00526             avio_skip(pb, name_len - ret);
00527         //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
00528         value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00529         avio_skip(pb, value_len - 2);
00530 
00531         if(stream_num<128){
00532             if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
00533             else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
00534         }
00535     }
00536 
00537     return 0;
00538 }
00539 
00540 static int asf_read_marker(AVFormatContext *s, int64_t size)
00541 {
00542     AVIOContext *pb = s->pb;
00543     int i, count, name_len, ret;
00544     char name[1024];
00545 
00546     avio_rl64(pb);            // reserved 16 bytes
00547     avio_rl64(pb);            // ...
00548     count = avio_rl32(pb);    // markers count
00549     avio_rl16(pb);            // reserved 2 bytes
00550     name_len = avio_rl16(pb); // name length
00551     for(i=0;i<name_len;i++){
00552         avio_r8(pb); // skip the name
00553     }
00554 
00555     for(i=0;i<count;i++){
00556         int64_t pres_time;
00557         int name_len;
00558 
00559         avio_rl64(pb);             // offset, 8 bytes
00560         pres_time = avio_rl64(pb); // presentation time
00561         avio_rl16(pb);             // entry length
00562         avio_rl32(pb);             // send time
00563         avio_rl32(pb);             // flags
00564         name_len = avio_rl32(pb);  // name length
00565         if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
00566             avio_skip(pb, name_len - ret);
00567         avpriv_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
00568     }
00569 
00570     return 0;
00571 }
00572 
00573 static int asf_read_header(AVFormatContext *s)
00574 {
00575     ASFContext *asf = s->priv_data;
00576     ff_asf_guid g;
00577     AVIOContext *pb = s->pb;
00578     int i;
00579     int64_t gsize;
00580 
00581     ff_get_guid(pb, &g);
00582     if (ff_guidcmp(&g, &ff_asf_header))
00583         return -1;
00584     avio_rl64(pb);
00585     avio_rl32(pb);
00586     avio_r8(pb);
00587     avio_r8(pb);
00588     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00589     for(;;) {
00590         uint64_t gpos= avio_tell(pb);
00591         ff_get_guid(pb, &g);
00592         gsize = avio_rl64(pb);
00593         av_dlog(s, "%08"PRIx64": ", gpos);
00594         print_guid(&g);
00595         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
00596         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
00597             asf->data_object_offset = avio_tell(pb);
00598             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00599             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00600                 asf->data_object_size = gsize - 24;
00601             } else {
00602                 asf->data_object_size = (uint64_t)-1;
00603             }
00604             break;
00605         }
00606         if (gsize < 24)
00607             return -1;
00608         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
00609             int ret = asf_read_file_properties(s, gsize);
00610             if (ret < 0)
00611                 return ret;
00612         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
00613             asf_read_stream_properties(s, gsize);
00614         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00615             asf_read_content_desc(s, gsize);
00616         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00617             asf_read_language_list(s, gsize);
00618         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00619             asf_read_ext_content_desc(s, gsize);
00620         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00621             asf_read_metadata(s, gsize);
00622         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00623             asf_read_ext_stream_properties(s, gsize);
00624 
00625             // there could be a optional stream properties object to follow
00626             // if so the next iteration will pick it up
00627             continue;
00628         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00629             ff_get_guid(pb, &g);
00630             avio_skip(pb, 6);
00631             continue;
00632         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00633             asf_read_marker(s, gsize);
00634         } else if (url_feof(pb)) {
00635             return -1;
00636         } else {
00637             if (!s->keylen) {
00638                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00639                     unsigned int len;
00640                     AVPacket pkt;
00641                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00642                     len= avio_rl32(pb);
00643                     av_log(s, AV_LOG_DEBUG, "Secret data:\n");
00644                     av_get_packet(pb, &pkt, len); av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size); av_free_packet(&pkt);
00645                     len= avio_rl32(pb);
00646                     get_tag(s, "ASF_Protection_Type", -1, len);
00647                     len= avio_rl32(pb);
00648                     get_tag(s, "ASF_Key_ID", -1, len);
00649                     len= avio_rl32(pb);
00650                     get_tag(s, "ASF_License_URL", -1, len);
00651                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00652                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00653                     av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
00654                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00655                     av_log(s, AV_LOG_INFO, "Digital signature detected!\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 (url_feof(pb))
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 (asf->no_resync_search)
00733         off = 3;
00734     else 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 (!url_feof(pb))
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 (!url_feof(pb))
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(!url_feof(pb)){
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, ts1 av_unused;
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 (rsize+asf->packet_replic_size > asf->packet_size_left) {
00832         av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
00833         return -1;
00834     }
00835     if (asf->packet_replic_size >= 8) {
00836         asf->packet_obj_size = avio_rl32(pb);
00837         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00838             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00839             return -1;
00840         }
00841         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
00842         if(asf->packet_replic_size >= 8+38+4){
00843 //            for(i=0; i<asf->packet_replic_size-8; i++)
00844 //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
00845 //            av_log(s, AV_LOG_DEBUG, "\n");
00846             avio_skip(pb, 10);
00847             ts0= avio_rl64(pb);
00848             ts1= avio_rl64(pb);
00849             avio_skip(pb, 12);
00850             avio_rl32(pb);
00851             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
00852             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00853             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00854         }else
00855             avio_skip(pb, asf->packet_replic_size - 8);
00856         rsize += asf->packet_replic_size; // FIXME - check validity
00857     } else if (asf->packet_replic_size==1){
00858         // multipacket - frag_offset is beginning timestamp
00859         asf->packet_time_start = asf->packet_frag_offset;
00860         asf->packet_frag_offset = 0;
00861         asf->packet_frag_timestamp = asf->packet_timestamp;
00862 
00863         asf->packet_time_delta = avio_r8(pb);
00864         rsize++;
00865     }else if(asf->packet_replic_size!=0){
00866         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00867         return -1;
00868     }
00869     if (asf->packet_flags & 0x01) {
00870         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00871         if (rsize > asf->packet_size_left) {
00872             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00873             return -1;
00874         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
00875             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
00876                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
00877                 return -1;
00878             } else {
00879                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
00880                 asf->packet_size_left += diff;
00881                 asf->packet_padsize   -= diff;
00882             }
00883         }
00884         //printf("Fragsize %d\n", asf->packet_frag_size);
00885     } else {
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(url_feof(pb))
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     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
01182         return AV_NOPTS_VALUE;
01183 
01184 //printf("asf_read_pts\n");
01185     asf_reset_header(s);
01186     for(;;){
01187         if (av_read_frame(s, pkt) < 0){
01188             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01189             return AV_NOPTS_VALUE;
01190         }
01191 
01192         pts = pkt->dts;
01193 
01194         av_free_packet(pkt);
01195         if(pkt->flags&AV_PKT_FLAG_KEY){
01196             i= pkt->stream_index;
01197 
01198             asf_st= s->streams[i]->priv_data;
01199 
01200 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01201             pos= asf_st->packet_pos;
01202 
01203             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01204             start_pos[i]= asf_st->packet_pos + 1;
01205 
01206             if(pkt->stream_index == stream_index)
01207                break;
01208         }
01209     }
01210 
01211     *ppos= pos;
01212 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01213 
01214     return pts;
01215 }
01216 
01217 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01218 {
01219     ff_asf_guid g;
01220     ASFContext *asf = s->priv_data;
01221     int64_t current_pos= avio_tell(s->pb);
01222 
01223     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {
01224         asf->index_read= -1;
01225         return;
01226     }
01227 
01228     ff_get_guid(s->pb, &g);
01229 
01230     /* the data object can be followed by other top-level objects,
01231        skip them until the simple index object is reached */
01232     while (ff_guidcmp(&g, &ff_asf_simple_index_header)) {
01233         int64_t gsize= avio_rl64(s->pb);
01234         if (gsize < 24 || url_feof(s->pb)) {
01235             avio_seek(s->pb, current_pos, SEEK_SET);
01236             asf->index_read= -1;
01237             return;
01238         }
01239         avio_skip(s->pb, gsize-24);
01240         ff_get_guid(s->pb, &g);
01241     }
01242 
01243     {
01244         int64_t itime, last_pos=-1;
01245         int pct, ict;
01246         int i;
01247         int64_t av_unused gsize= avio_rl64(s->pb);
01248         ff_get_guid(s->pb, &g);
01249         itime=avio_rl64(s->pb);
01250         pct=avio_rl32(s->pb);
01251         ict=avio_rl32(s->pb);
01252         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01253 
01254         for (i=0;i<ict;i++){
01255             int pktnum=avio_rl32(s->pb);
01256             int pktct =avio_rl16(s->pb);
01257             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01258             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
01259 
01260             if(pos != last_pos){
01261             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);
01262             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01263             last_pos=pos;
01264             }
01265         }
01266         asf->index_read= ict > 0;
01267     }
01268     avio_seek(s->pb, current_pos, SEEK_SET);
01269 }
01270 
01271 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01272 {
01273     ASFContext *asf = s->priv_data;
01274     AVStream *st = s->streams[stream_index];
01275 
01276     if (s->packet_size <= 0)
01277         return -1;
01278 
01279     /* Try using the protocol's read_seek if available */
01280     if(s->pb) {
01281         int ret = avio_seek_time(s->pb, stream_index, pts, flags);
01282         if(ret >= 0)
01283             asf_reset_header(s);
01284         if (ret != AVERROR(ENOSYS))
01285             return ret;
01286     }
01287 
01288     if (!asf->index_read)
01289         asf_build_simple_index(s, stream_index);
01290 
01291     if((asf->index_read > 0 && st->index_entries)){
01292         int index= av_index_search_timestamp(st, pts, flags);
01293         if(index >= 0) {
01294             /* find the position */
01295             uint64_t pos = st->index_entries[index].pos;
01296 
01297             /* do the seek */
01298             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01299             if(avio_seek(s->pb, pos, SEEK_SET) < 0)
01300                 return -1;
01301             asf_reset_header(s);
01302             return 0;
01303         }
01304     }
01305     /* no index or seeking by index failed */
01306     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
01307         return -1;
01308     asf_reset_header(s);
01309     return 0;
01310 }
01311 
01312 AVInputFormat ff_asf_demuxer = {
01313     .name           = "asf",
01314     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),
01315     .priv_data_size = sizeof(ASFContext),
01316     .read_probe     = asf_probe,
01317     .read_header    = asf_read_header,
01318     .read_packet    = asf_read_packet,
01319     .read_close     = asf_read_close,
01320     .read_seek      = asf_read_seek,
01321     .read_timestamp = asf_read_pts,
01322     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
01323     .priv_class     = &asf_class,
01324 };