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 "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 static int asf_probe(AVProbeData *pd)
00137 {
00138     /* check file header */
00139     if (!ff_guidcmp(pd->buf, &ff_asf_header))
00140         return AVPROBE_SCORE_MAX;
00141     else
00142         return 0;
00143 }
00144 
00145 static int get_value(AVIOContext *pb, int type){
00146     switch(type){
00147         case 2: return avio_rl32(pb);
00148         case 3: return avio_rl32(pb);
00149         case 4: return avio_rl64(pb);
00150         case 5: return avio_rl16(pb);
00151         default:return INT_MIN;
00152     }
00153 }
00154 
00155 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
00156 {
00157     char *value;
00158     int64_t off = avio_tell(s->pb);
00159 
00160     if ((unsigned)len >= (UINT_MAX - 1)/2)
00161         return;
00162 
00163     value = av_malloc(2*len+1);
00164     if (!value)
00165         goto finish;
00166 
00167     if (type == 0) {         // UTF16-LE
00168         avio_get_str16le(s->pb, len, value, 2*len + 1);
00169     } else if (type == -1) { // ASCII
00170         avio_read(s->pb, value, len);
00171         value[len]=0;
00172     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
00173         uint64_t num = get_value(s->pb, type);
00174         snprintf(value, len, "%"PRIu64, num);
00175     } else {
00176         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
00177         goto finish;
00178     }
00179     if (*value)
00180         av_dict_set(&s->metadata, key, value, 0);
00181 finish:
00182     av_freep(&value);
00183     avio_seek(s->pb, off + len, SEEK_SET);
00184 }
00185 
00186 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
00187 {
00188     ASFContext *asf = s->priv_data;
00189     AVIOContext *pb = s->pb;
00190 
00191     ff_get_guid(pb, &asf->hdr.guid);
00192     asf->hdr.file_size          = avio_rl64(pb);
00193     asf->hdr.create_time        = avio_rl64(pb);
00194     avio_rl64(pb);                               /* number of packets */
00195     asf->hdr.play_time          = avio_rl64(pb);
00196     asf->hdr.send_time          = avio_rl64(pb);
00197     asf->hdr.preroll            = avio_rl32(pb);
00198     asf->hdr.ignore             = avio_rl32(pb);
00199     asf->hdr.flags              = avio_rl32(pb);
00200     asf->hdr.min_pktsize        = avio_rl32(pb);
00201     asf->hdr.max_pktsize        = avio_rl32(pb);
00202     asf->hdr.max_bitrate        = avio_rl32(pb);
00203     s->packet_size = asf->hdr.max_pktsize;
00204 
00205     return 0;
00206 }
00207 
00208 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
00209 {
00210     ASFContext *asf = s->priv_data;
00211     AVIOContext *pb = s->pb;
00212     AVStream *st;
00213     ASFStream *asf_st;
00214     ff_asf_guid g;
00215     enum AVMediaType type;
00216     int type_specific_size, sizeX;
00217     unsigned int tag1;
00218     int64_t pos1, pos2, start_time;
00219     int test_for_ext_stream_audio, is_dvr_ms_audio=0;
00220 
00221     if (s->nb_streams == ASF_MAX_STREAMS) {
00222         av_log(s, AV_LOG_ERROR, "too many streams\n");
00223         return AVERROR(EINVAL);
00224     }
00225 
00226     pos1 = avio_tell(pb);
00227 
00228     st = avformat_new_stream(s, NULL);
00229     if (!st)
00230         return AVERROR(ENOMEM);
00231     avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00232     asf_st = av_mallocz(sizeof(ASFStream));
00233     if (!asf_st)
00234         return AVERROR(ENOMEM);
00235     st->priv_data = asf_st;
00236     start_time = asf->hdr.preroll;
00237 
00238     asf_st->stream_language_index = 128; // invalid stream index means no language info
00239 
00240     if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00241         st->duration = asf->hdr.play_time /
00242             (10000000 / 1000) - start_time;
00243     }
00244     ff_get_guid(pb, &g);
00245 
00246     test_for_ext_stream_audio = 0;
00247     if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
00248         type = AVMEDIA_TYPE_AUDIO;
00249     } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
00250         type = AVMEDIA_TYPE_VIDEO;
00251     } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
00252         type = AVMEDIA_TYPE_VIDEO;
00253         st->codec->codec_id = CODEC_ID_MJPEG;
00254     } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
00255         type = AVMEDIA_TYPE_DATA;
00256     } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
00257         test_for_ext_stream_audio = 1;
00258         type = AVMEDIA_TYPE_UNKNOWN;
00259     } else {
00260         return -1;
00261     }
00262     ff_get_guid(pb, &g);
00263     avio_skip(pb, 8); /* total_size */
00264     type_specific_size = avio_rl32(pb);
00265     avio_rl32(pb);
00266     st->id = avio_rl16(pb) & 0x7f; /* stream id */
00267     // mapping of asf ID to AV stream ID;
00268     asf->asfid2avid[st->id] = s->nb_streams - 1;
00269 
00270     avio_rl32(pb);
00271 
00272     if (test_for_ext_stream_audio) {
00273         ff_get_guid(pb, &g);
00274         if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
00275             type = AVMEDIA_TYPE_AUDIO;
00276             is_dvr_ms_audio=1;
00277             ff_get_guid(pb, &g);
00278             avio_rl32(pb);
00279             avio_rl32(pb);
00280             avio_rl32(pb);
00281             ff_get_guid(pb, &g);
00282             avio_rl32(pb);
00283         }
00284     }
00285 
00286     st->codec->codec_type = type;
00287     if (type == AVMEDIA_TYPE_AUDIO) {
00288         int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
00289         if (ret < 0)
00290             return ret;
00291         if (is_dvr_ms_audio) {
00292             // codec_id and codec_tag are unreliable in dvr_ms
00293             // files. Set them later by probing stream.
00294             st->request_probe= 1;
00295             st->codec->codec_tag = 0;
00296         }
00297         if (st->codec->codec_id == CODEC_ID_AAC) {
00298             st->need_parsing = AVSTREAM_PARSE_NONE;
00299         } else {
00300             st->need_parsing = AVSTREAM_PARSE_FULL;
00301         }
00302         /* We have to init the frame size at some point .... */
00303         pos2 = avio_tell(pb);
00304         if (size >= (pos2 + 8 - pos1 + 24)) {
00305             asf_st->ds_span = avio_r8(pb);
00306             asf_st->ds_packet_size = avio_rl16(pb);
00307             asf_st->ds_chunk_size = avio_rl16(pb);
00308             avio_rl16(pb); //ds_data_size
00309             avio_r8(pb);   //ds_silence_data
00310         }
00311         //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
00312         //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
00313         //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
00314         if (asf_st->ds_span > 1) {
00315             if (!asf_st->ds_chunk_size
00316                     || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00317                     || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00318                 asf_st->ds_span = 0; // disable descrambling
00319         }
00320         switch (st->codec->codec_id) {
00321             case CODEC_ID_MP3:
00322                 st->codec->frame_size = MPA_FRAME_SIZE;
00323                 break;
00324             case CODEC_ID_PCM_S16LE:
00325             case CODEC_ID_PCM_S16BE:
00326             case CODEC_ID_PCM_U16LE:
00327             case CODEC_ID_PCM_U16BE:
00328             case CODEC_ID_PCM_S8:
00329             case CODEC_ID_PCM_U8:
00330             case CODEC_ID_PCM_ALAW:
00331             case CODEC_ID_PCM_MULAW:
00332                 st->codec->frame_size = 1;
00333                 break;
00334             default:
00335                 /* This is probably wrong, but it prevents a crash later */
00336                 st->codec->frame_size = 1;
00337                 break;
00338         }
00339     } else if (type == AVMEDIA_TYPE_VIDEO &&
00340             size - (avio_tell(pb) - pos1 + 24) >= 51) {
00341         avio_rl32(pb);
00342         avio_rl32(pb);
00343         avio_r8(pb);
00344         avio_rl16(pb);        /* size */
00345         sizeX= avio_rl32(pb); /* size */
00346         st->codec->width = avio_rl32(pb);
00347         st->codec->height = avio_rl32(pb);
00348         /* not available for asf */
00349         avio_rl16(pb); /* panes */
00350         st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
00351         tag1 = avio_rl32(pb);
00352         avio_skip(pb, 20);
00353         //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
00354         if (sizeX > 40) {
00355             st->codec->extradata_size = sizeX - 40;
00356             st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00357             avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00358         }
00359 
00360         /* Extract palette from extradata if bpp <= 8 */
00361         /* This code assumes that extradata contains only palette */
00362         /* This is true for all paletted codecs implemented in libavcodec */
00363         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00364             int av_unused i;
00365 #if HAVE_BIGENDIAN
00366             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00367                 asf_st->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
00368 #else
00369             memcpy(asf_st->palette, st->codec->extradata,
00370                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00371 #endif
00372             asf_st->palette_changed = 1;
00373         }
00374 
00375         st->codec->codec_tag = tag1;
00376         st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00377         if(tag1 == MKTAG('D', 'V', 'R', ' ')){
00378             st->need_parsing = AVSTREAM_PARSE_FULL;
00379             // 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
00380             st->codec->width  =
00381                 st->codec->height = 0;
00382             av_freep(&st->codec->extradata);
00383             st->codec->extradata_size=0;
00384         }
00385         if(st->codec->codec_id == CODEC_ID_H264)
00386             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
00387     }
00388     pos2 = avio_tell(pb);
00389     avio_skip(pb, size - (pos2 - pos1 + 24));
00390 
00391     return 0;
00392 }
00393 
00394 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
00395 {
00396     ASFContext *asf = s->priv_data;
00397     AVIOContext *pb = s->pb;
00398     ff_asf_guid g;
00399     int ext_len, payload_ext_ct, stream_ct, i;
00400     uint32_t leak_rate, stream_num;
00401     unsigned int stream_languageid_index;
00402 
00403     avio_rl64(pb); // starttime
00404     avio_rl64(pb); // endtime
00405     leak_rate = avio_rl32(pb); // leak-datarate
00406     avio_rl32(pb); // bucket-datasize
00407     avio_rl32(pb); // init-bucket-fullness
00408     avio_rl32(pb); // alt-leak-datarate
00409     avio_rl32(pb); // alt-bucket-datasize
00410     avio_rl32(pb); // alt-init-bucket-fullness
00411     avio_rl32(pb); // max-object-size
00412     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00413     stream_num = avio_rl16(pb); // stream-num
00414 
00415     stream_languageid_index = avio_rl16(pb); // stream-language-id-index
00416     if (stream_num < 128)
00417         asf->streams[stream_num].stream_language_index = stream_languageid_index;
00418 
00419     avio_rl64(pb); // avg frametime in 100ns units
00420     stream_ct = avio_rl16(pb); //stream-name-count
00421     payload_ext_ct = avio_rl16(pb); //payload-extension-system-count
00422 
00423     if (stream_num < 128)
00424         asf->stream_bitrates[stream_num] = leak_rate;
00425 
00426     for (i=0; i<stream_ct; i++){
00427         avio_rl16(pb);
00428         ext_len = avio_rl16(pb);
00429         avio_skip(pb, ext_len);
00430     }
00431 
00432     for (i=0; i<payload_ext_ct; i++){
00433         ff_get_guid(pb, &g);
00434         avio_skip(pb, 2);
00435         ext_len=avio_rl32(pb);
00436         avio_skip(pb, ext_len);
00437     }
00438 
00439     return 0;
00440 }
00441 
00442 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
00443 {
00444     AVIOContext *pb = s->pb;
00445     int len1, len2, len3, len4, len5;
00446 
00447     len1 = avio_rl16(pb);
00448     len2 = avio_rl16(pb);
00449     len3 = avio_rl16(pb);
00450     len4 = avio_rl16(pb);
00451     len5 = avio_rl16(pb);
00452     get_tag(s, "title"    , 0, len1);
00453     get_tag(s, "author"   , 0, len2);
00454     get_tag(s, "copyright", 0, len3);
00455     get_tag(s, "comment"  , 0, len4);
00456     avio_skip(pb, len5);
00457 
00458     return 0;
00459 }
00460 
00461 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
00462 {
00463     AVIOContext *pb = s->pb;
00464     ASFContext *asf = s->priv_data;
00465     int desc_count, i, ret;
00466 
00467     desc_count = avio_rl16(pb);
00468     for(i=0;i<desc_count;i++) {
00469         int name_len,value_type,value_len;
00470         char name[1024];
00471 
00472         name_len = avio_rl16(pb);
00473         if (name_len%2)     // must be even, broken lavf versions wrote len-1
00474             name_len += 1;
00475         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00476             avio_skip(pb, name_len - ret);
00477         value_type = avio_rl16(pb);
00478         value_len  = avio_rl16(pb);
00479         if (!value_type && value_len%2)
00480             value_len += 1;
00485         if (!strcmp(name, "AspectRatioX")){
00486             asf->dar[0].num= get_value(s->pb, value_type);
00487         } else if(!strcmp(name, "AspectRatioY")){
00488             asf->dar[0].den= get_value(s->pb, value_type);
00489         } else
00490             get_tag(s, name, value_type, value_len);
00491     }
00492 
00493     return 0;
00494 }
00495 
00496 static int asf_read_language_list(AVFormatContext *s, int64_t size)
00497 {
00498     AVIOContext *pb = s->pb;
00499     ASFContext *asf = s->priv_data;
00500     int j, ret;
00501     int stream_count = avio_rl16(pb);
00502     for(j = 0; j < stream_count; j++) {
00503         char lang[6];
00504         unsigned int lang_len = avio_r8(pb);
00505         if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
00506             avio_skip(pb, lang_len - ret);
00507         if (j < 128)
00508             av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
00509     }
00510 
00511     return 0;
00512 }
00513 
00514 static int asf_read_metadata(AVFormatContext *s, int64_t size)
00515 {
00516     AVIOContext *pb = s->pb;
00517     ASFContext *asf = s->priv_data;
00518     int n, stream_num, name_len, value_len, value_num;
00519     int ret, i;
00520     n = avio_rl16(pb);
00521 
00522     for(i=0;i<n;i++) {
00523         char name[1024];
00524 
00525         avio_rl16(pb); //lang_list_index
00526         stream_num= avio_rl16(pb);
00527         name_len=   avio_rl16(pb);
00528         avio_skip(pb, 2); /* value_type */
00529         value_len=  avio_rl32(pb);
00530 
00531         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00532             avio_skip(pb, name_len - ret);
00533         //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
00534         value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00535         avio_skip(pb, value_len - 2);
00536 
00537         if(stream_num<128){
00538             if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
00539             else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
00540         }
00541     }
00542 
00543     return 0;
00544 }
00545 
00546 static int asf_read_marker(AVFormatContext *s, int64_t size)
00547 {
00548     AVIOContext *pb = s->pb;
00549     int i, count, name_len, ret;
00550     char name[1024];
00551 
00552     avio_rl64(pb);            // reserved 16 bytes
00553     avio_rl64(pb);            // ...
00554     count = avio_rl32(pb);    // markers count
00555     avio_rl16(pb);            // reserved 2 bytes
00556     name_len = avio_rl16(pb); // name length
00557     for(i=0;i<name_len;i++){
00558         avio_r8(pb); // skip the name
00559     }
00560 
00561     for(i=0;i<count;i++){
00562         int64_t pres_time;
00563         int name_len;
00564 
00565         avio_rl64(pb);             // offset, 8 bytes
00566         pres_time = avio_rl64(pb); // presentation time
00567         avio_rl16(pb);             // entry length
00568         avio_rl32(pb);             // send time
00569         avio_rl32(pb);             // flags
00570         name_len = avio_rl32(pb);  // name length
00571         if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
00572             avio_skip(pb, name_len - ret);
00573         avpriv_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
00574     }
00575 
00576     return 0;
00577 }
00578 
00579 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
00580 {
00581     ASFContext *asf = s->priv_data;
00582     ff_asf_guid g;
00583     AVIOContext *pb = s->pb;
00584     int i;
00585     int64_t gsize;
00586 
00587     ff_get_guid(pb, &g);
00588     if (ff_guidcmp(&g, &ff_asf_header))
00589         return -1;
00590     avio_rl64(pb);
00591     avio_rl32(pb);
00592     avio_r8(pb);
00593     avio_r8(pb);
00594     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00595     for(;;) {
00596         uint64_t gpos= avio_tell(pb);
00597         ff_get_guid(pb, &g);
00598         gsize = avio_rl64(pb);
00599         av_dlog(s, "%08"PRIx64": ", gpos);
00600         print_guid(&g);
00601         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
00602         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
00603             asf->data_object_offset = avio_tell(pb);
00604             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00605             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00606                 asf->data_object_size = gsize - 24;
00607             } else {
00608                 asf->data_object_size = (uint64_t)-1;
00609             }
00610             break;
00611         }
00612         if (gsize < 24)
00613             return -1;
00614         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
00615             asf_read_file_properties(s, gsize);
00616         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
00617             asf_read_stream_properties(s, gsize);
00618         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00619             asf_read_content_desc(s, gsize);
00620         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00621             asf_read_language_list(s, gsize);
00622         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00623             asf_read_ext_content_desc(s, gsize);
00624         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00625             asf_read_metadata(s, gsize);
00626         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00627             asf_read_ext_stream_properties(s, gsize);
00628 
00629             // there could be a optional stream properties object to follow
00630             // if so the next iteration will pick it up
00631             continue;
00632         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00633             ff_get_guid(pb, &g);
00634             avio_skip(pb, 6);
00635             continue;
00636         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00637             asf_read_marker(s, gsize);
00638         } else if (url_feof(pb)) {
00639             return -1;
00640         } else {
00641             if (!s->keylen) {
00642                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00643                     unsigned int len;
00644                     AVPacket pkt;
00645                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00646                     len= avio_rl32(pb);
00647                     av_log(s, AV_LOG_DEBUG, "Secret data:\n");
00648                     av_get_packet(pb, &pkt, len); av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size); av_free_packet(&pkt);
00649                     len= avio_rl32(pb);
00650                     get_tag(s, "ASF_Protection_Type", -1, len);
00651                     len= avio_rl32(pb);
00652                     get_tag(s, "ASF_Key_ID", -1, len);
00653                     len= avio_rl32(pb);
00654                     get_tag(s, "ASF_License_URL", -1, len);
00655                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00656                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00657                     av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
00658                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00659                     av_log(s, AV_LOG_INFO, "Digital signature detected!\n");
00660                 }
00661             }
00662         }
00663         if(avio_tell(pb) != gpos + gsize)
00664             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
00665         avio_seek(pb, gpos + gsize, SEEK_SET);
00666     }
00667     ff_get_guid(pb, &g);
00668     avio_rl64(pb);
00669     avio_r8(pb);
00670     avio_r8(pb);
00671     if (url_feof(pb))
00672         return -1;
00673     asf->data_offset = avio_tell(pb);
00674     asf->packet_size_left = 0;
00675 
00676 
00677     for(i=0; i<128; i++){
00678         int stream_num= asf->asfid2avid[i];
00679         if(stream_num>=0){
00680             AVStream *st = s->streams[stream_num];
00681             if (!st->codec->bit_rate)
00682                 st->codec->bit_rate = asf->stream_bitrates[i];
00683             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
00684                 av_reduce(&st->sample_aspect_ratio.num,
00685                           &st->sample_aspect_ratio.den,
00686                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
00687             } 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.
00688                 av_reduce(&st->sample_aspect_ratio.num,
00689                           &st->sample_aspect_ratio.den,
00690                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
00691 
00692 //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);
00693 
00694             // copy and convert language codes to the frontend
00695             if (asf->streams[i].stream_language_index < 128) {
00696                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00697                 if (rfc1766 && strlen(rfc1766) > 1) {
00698                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00699                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00700                     if (iso6392)
00701                         av_dict_set(&st->metadata, "language", iso6392, 0);
00702                 }
00703             }
00704         }
00705     }
00706 
00707     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00708 
00709     return 0;
00710 }
00711 
00712 #define DO_2BITS(bits, var, defval) \
00713     switch (bits & 3) \
00714     { \
00715     case 3: var = avio_rl32(pb); rsize += 4; break; \
00716     case 2: var = avio_rl16(pb); rsize += 2; break; \
00717     case 1: var = avio_r8(pb);   rsize++; break; \
00718     default: var = defval; break; \
00719     }
00720 
00727 static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
00728 {
00729     ASFContext *asf = s->priv_data;
00730     uint32_t packet_length, padsize;
00731     int rsize = 8;
00732     int c, d, e, off;
00733 
00734     // if we do not know packet size, allow skipping up to 32 kB
00735     off= 32768;
00736     if (s->packet_size > 0)
00737         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
00738 
00739     c=d=e=-1;
00740     while(off-- > 0){
00741         c=d; d=e;
00742         e= avio_r8(pb);
00743         if(c == 0x82 && !d && !e)
00744             break;
00745     }
00746 
00747     if (c != 0x82) {
00754         if (pb->error == AVERROR(EAGAIN))
00755             return AVERROR(EAGAIN);
00756         if (!url_feof(pb))
00757             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
00758     }
00759     if ((c & 0x8f) == 0x82) {
00760         if (d || e) {
00761             if (!url_feof(pb))
00762                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00763             return -1;
00764         }
00765         c= avio_r8(pb);
00766         d= avio_r8(pb);
00767         rsize+=3;
00768     }else if(!url_feof(pb)){
00769         avio_seek(pb, -1, SEEK_CUR); //FIXME
00770     }
00771 
00772     asf->packet_flags    = c;
00773     asf->packet_property = d;
00774 
00775     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00776     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00777     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00778 
00779     //the following checks prevent overflows and infinite loops
00780     if(!packet_length || packet_length >= (1U<<29)){
00781         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
00782         return -1;
00783     }
00784     if(padsize >= packet_length){
00785         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
00786         return -1;
00787     }
00788 
00789     asf->packet_timestamp = avio_rl32(pb);
00790     avio_rl16(pb); /* duration */
00791     // rsize has at least 11 bytes which have to be present
00792 
00793     if (asf->packet_flags & 0x01) {
00794         asf->packet_segsizetype = avio_r8(pb); rsize++;
00795         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00796     } else {
00797         asf->packet_segments = 1;
00798         asf->packet_segsizetype = 0x80;
00799     }
00800     asf->packet_size_left = packet_length - padsize - rsize;
00801     if (packet_length < asf->hdr.min_pktsize)
00802         padsize += asf->hdr.min_pktsize - packet_length;
00803     asf->packet_padsize = padsize;
00804     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00805     return 0;
00806 }
00807 
00812 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
00813     ASFContext *asf = s->priv_data;
00814     int rsize = 1;
00815     int num = avio_r8(pb);
00816     int64_t ts0, ts1 av_unused;
00817 
00818     asf->packet_segments--;
00819     asf->packet_key_frame = num >> 7;
00820     asf->stream_index = asf->asfid2avid[num & 0x7f];
00821     // sequence should be ignored!
00822     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00823     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00824     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00825 //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);
00826     if (rsize+asf->packet_replic_size > asf->packet_size_left) {
00827         av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
00828         return -1;
00829     }
00830     if (asf->packet_replic_size >= 8) {
00831         asf->packet_obj_size = avio_rl32(pb);
00832         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00833             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00834             return -1;
00835         }
00836         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
00837         if(asf->packet_replic_size >= 8+38+4){
00838 //            for(i=0; i<asf->packet_replic_size-8; i++)
00839 //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
00840 //            av_log(s, AV_LOG_DEBUG, "\n");
00841             avio_skip(pb, 10);
00842             ts0= avio_rl64(pb);
00843             ts1= avio_rl64(pb);
00844             avio_skip(pb, 12);
00845             avio_rl32(pb);
00846             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
00847             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00848             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00849         }else
00850             avio_skip(pb, asf->packet_replic_size - 8);
00851         rsize += asf->packet_replic_size; // FIXME - check validity
00852     } else if (asf->packet_replic_size==1){
00853         // multipacket - frag_offset is beginning timestamp
00854         asf->packet_time_start = asf->packet_frag_offset;
00855         asf->packet_frag_offset = 0;
00856         asf->packet_frag_timestamp = asf->packet_timestamp;
00857 
00858         asf->packet_time_delta = avio_r8(pb);
00859         rsize++;
00860     }else if(asf->packet_replic_size!=0){
00861         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00862         return -1;
00863     }
00864     if (asf->packet_flags & 0x01) {
00865         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00866         if (rsize > asf->packet_size_left) {
00867             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00868             return -1;
00869         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
00870             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
00871                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
00872                 return -1;
00873             } else {
00874                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
00875                 asf->packet_size_left += diff;
00876                 asf->packet_padsize   -= diff;
00877             }
00878         }
00879         //printf("Fragsize %d\n", asf->packet_frag_size);
00880     } else {
00881         asf->packet_frag_size = asf->packet_size_left - rsize;
00882         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00883     }
00884     if (asf->packet_replic_size == 1) {
00885         asf->packet_multi_size = asf->packet_frag_size;
00886         if (asf->packet_multi_size > asf->packet_size_left)
00887             return -1;
00888     }
00889     asf->packet_size_left -= rsize;
00890     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00891 
00892     return 0;
00893 }
00894 
00904 static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
00905 {
00906     ASFContext *asf = s->priv_data;
00907     ASFStream *asf_st = 0;
00908     for (;;) {
00909         int ret;
00910         if(url_feof(pb))
00911             return AVERROR_EOF;
00912         if (asf->packet_size_left < FRAME_HEADER_SIZE
00913             || asf->packet_segments < 1) {
00914             //asf->packet_size_left <= asf->packet_padsize) {
00915             int ret = asf->packet_size_left + asf->packet_padsize;
00916             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));
00917             assert(ret>=0);
00918             /* fail safe */
00919             avio_skip(pb, ret);
00920 
00921             asf->packet_pos= avio_tell(pb);
00922             if (asf->data_object_size != (uint64_t)-1 &&
00923                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00924                 return AVERROR_EOF; /* Do not exceed the size of the data object */
00925             return 1;
00926         }
00927         if (asf->packet_time_start == 0) {
00928             if(asf_read_frame_header(s, pb) < 0){
00929                 asf->packet_segments= 0;
00930                 continue;
00931             }
00932             if (asf->stream_index < 0
00933                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00934                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00935                 ) {
00936                 asf->packet_time_start = 0;
00937                 /* unhandled packet (should not happen) */
00938                 avio_skip(pb, asf->packet_frag_size);
00939                 asf->packet_size_left -= asf->packet_frag_size;
00940                 if(asf->stream_index < 0)
00941                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00942                 continue;
00943             }
00944             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00945         }
00946         asf_st = asf->asf_st;
00947 
00948         if (asf->packet_replic_size == 1) {
00949             // frag_offset is here used as the beginning timestamp
00950             asf->packet_frag_timestamp = asf->packet_time_start;
00951             asf->packet_time_start += asf->packet_time_delta;
00952             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
00953             asf->packet_size_left--;
00954             asf->packet_multi_size--;
00955             if (asf->packet_multi_size < asf->packet_obj_size)
00956             {
00957                 asf->packet_time_start = 0;
00958                 avio_skip(pb, asf->packet_multi_size);
00959                 asf->packet_size_left -= asf->packet_multi_size;
00960                 continue;
00961             }
00962             asf->packet_multi_size -= asf->packet_obj_size;
00963             //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);
00964         }
00965         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00966               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00967            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00968             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00969                 asf_st->frag_offset, asf->packet_frag_size,
00970                 asf->packet_obj_size, asf_st->pkt.size);
00971             asf->packet_obj_size= asf_st->pkt.size;
00972         }
00973 
00974         if (   asf_st->pkt.size != asf->packet_obj_size
00975             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00976             if(asf_st->pkt.data){
00977                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00978                 asf_st->frag_offset = 0;
00979                 av_free_packet(&asf_st->pkt);
00980             }
00981             /* new packet */
00982             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00983             asf_st->seq = asf->packet_seq;
00984             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
00985             asf_st->pkt.stream_index = asf->stream_index;
00986             asf_st->pkt.pos =
00987             asf_st->packet_pos= asf->packet_pos;
00988             if (asf_st->pkt.data && asf_st->palette_changed) {
00989                 uint8_t *pal;
00990                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
00991                                               AVPALETTE_SIZE);
00992                 if (!pal) {
00993                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
00994                 } else {
00995                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
00996                     asf_st->palette_changed = 0;
00997                 }
00998             }
00999 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
01000 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
01001 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
01002             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
01003                 asf->packet_key_frame = 1;
01004             if (asf->packet_key_frame)
01005                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
01006         }
01007 
01008         /* read data */
01009         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
01010         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
01011         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
01012         asf->packet_size_left -= asf->packet_frag_size;
01013         if (asf->packet_size_left < 0)
01014             continue;
01015 
01016         if(   asf->packet_frag_offset >= asf_st->pkt.size
01017            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
01018             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
01019                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
01020             continue;
01021         }
01022 
01023         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
01024                          asf->packet_frag_size);
01025         if (ret != asf->packet_frag_size) {
01026             if (ret < 0 || asf->packet_frag_offset + ret == 0)
01027                 return ret < 0 ? ret : AVERROR_EOF;
01028             if (asf_st->ds_span > 1) {
01029                 // scrambling, we can either drop it completely or fill the remainder
01030                 // TODO: should we fill the whole packet instead of just the current
01031                 // fragment?
01032                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
01033                        asf->packet_frag_size - ret);
01034                 ret = asf->packet_frag_size;
01035             } else
01036                 // no scrambling, so we can return partial packets
01037                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
01038         }
01039         if (s->key && s->keylen == 20)
01040             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
01041                             ret);
01042         asf_st->frag_offset += ret;
01043         /* test if whole packet is read */
01044         if (asf_st->frag_offset == asf_st->pkt.size) {
01045             //workaround for macroshit radio DVR-MS files
01046             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
01047                && asf_st->pkt.size > 100){
01048                 int i;
01049                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
01050                 if(i == asf_st->pkt.size){
01051                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
01052                     asf_st->frag_offset = 0;
01053                     av_free_packet(&asf_st->pkt);
01054                     continue;
01055                 }
01056             }
01057 
01058             /* return packet */
01059             if (asf_st->ds_span > 1) {
01060               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
01061                     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);
01062               }else{
01063                 /* packet descrambling */
01064                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
01065                 if (newdata) {
01066                     int offset = 0;
01067                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
01068                     while (offset < asf_st->pkt.size) {
01069                         int off = offset / asf_st->ds_chunk_size;
01070                         int row = off / asf_st->ds_span;
01071                         int col = off % asf_st->ds_span;
01072                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
01073                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
01074 
01075                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
01076                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
01077                         memcpy(newdata + offset,
01078                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
01079                                asf_st->ds_chunk_size);
01080                         offset += asf_st->ds_chunk_size;
01081                     }
01082                     av_free(asf_st->pkt.data);
01083                     asf_st->pkt.data = newdata;
01084                 }
01085               }
01086             }
01087             asf_st->frag_offset = 0;
01088             *pkt= asf_st->pkt;
01089             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
01090             asf_st->pkt.size = 0;
01091             asf_st->pkt.data = 0;
01092             break; // packet completed
01093         }
01094     }
01095     return 0;
01096 }
01097 
01098 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
01099 {
01100     ASFContext *asf = s->priv_data;
01101 
01102     for (;;) {
01103         int ret;
01104 
01105         /* parse cached packets, if any */
01106         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
01107             return ret;
01108         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
01109             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
01110         asf->packet_time_start = 0;
01111     }
01112 }
01113 
01114 // Added to support seeking after packets have been read
01115 // If information is not reset, read_packet fails due to
01116 // leftover information from previous reads
01117 static void asf_reset_header(AVFormatContext *s)
01118 {
01119     ASFContext *asf = s->priv_data;
01120     ASFStream *asf_st;
01121     int i;
01122 
01123     asf->packet_size_left = 0;
01124     asf->packet_segments = 0;
01125     asf->packet_flags = 0;
01126     asf->packet_property = 0;
01127     asf->packet_timestamp = 0;
01128     asf->packet_segsizetype = 0;
01129     asf->packet_segments = 0;
01130     asf->packet_seq = 0;
01131     asf->packet_replic_size = 0;
01132     asf->packet_key_frame = 0;
01133     asf->packet_padsize = 0;
01134     asf->packet_frag_offset = 0;
01135     asf->packet_frag_size = 0;
01136     asf->packet_frag_timestamp = 0;
01137     asf->packet_multi_size = 0;
01138     asf->packet_obj_size = 0;
01139     asf->packet_time_delta = 0;
01140     asf->packet_time_start = 0;
01141 
01142     for(i=0; i<s->nb_streams; i++){
01143         asf_st= s->streams[i]->priv_data;
01144         av_free_packet(&asf_st->pkt);
01145         asf_st->frag_offset=0;
01146         asf_st->seq=0;
01147     }
01148     asf->asf_st= NULL;
01149 }
01150 
01151 static int asf_read_close(AVFormatContext *s)
01152 {
01153     asf_reset_header(s);
01154 
01155     return 0;
01156 }
01157 
01158 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01159 {
01160     AVPacket pkt1, *pkt = &pkt1;
01161     ASFStream *asf_st;
01162     int64_t pts;
01163     int64_t pos= *ppos;
01164     int i;
01165     int64_t start_pos[ASF_MAX_STREAMS];
01166 
01167     for(i=0; i<s->nb_streams; i++){
01168         start_pos[i]= pos;
01169     }
01170 
01171     if (s->packet_size > 0)
01172         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01173     *ppos= pos;
01174     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
01175         return AV_NOPTS_VALUE;
01176 
01177 //printf("asf_read_pts\n");
01178     asf_reset_header(s);
01179     for(;;){
01180         if (av_read_frame(s, pkt) < 0){
01181             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01182             return AV_NOPTS_VALUE;
01183         }
01184 
01185         pts = pkt->dts;
01186 
01187         av_free_packet(pkt);
01188         if(pkt->flags&AV_PKT_FLAG_KEY){
01189             i= pkt->stream_index;
01190 
01191             asf_st= s->streams[i]->priv_data;
01192 
01193 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01194             pos= asf_st->packet_pos;
01195 
01196             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01197             start_pos[i]= asf_st->packet_pos + 1;
01198 
01199             if(pkt->stream_index == stream_index)
01200                break;
01201         }
01202     }
01203 
01204     *ppos= pos;
01205 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01206 
01207     return pts;
01208 }
01209 
01210 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01211 {
01212     ff_asf_guid g;
01213     ASFContext *asf = s->priv_data;
01214     int64_t current_pos= avio_tell(s->pb);
01215     int i;
01216 
01217     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {
01218         asf->index_read= -1;
01219         return;
01220     }
01221 
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 || url_feof(s->pb)) {
01229             avio_seek(s->pb, current_pos, SEEK_SET);
01230             asf->index_read= -1;
01231             return;
01232         }
01233         avio_skip(s->pb, gsize-24);
01234         ff_get_guid(s->pb, &g);
01235     }
01236 
01237     {
01238         int64_t itime, last_pos=-1;
01239         int pct, ict;
01240         int64_t av_unused gsize= avio_rl64(s->pb);
01241         ff_get_guid(s->pb, &g);
01242         itime=avio_rl64(s->pb);
01243         pct=avio_rl32(s->pb);
01244         ict=avio_rl32(s->pb);
01245         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01246 
01247         for (i=0;i<ict;i++){
01248             int pktnum=avio_rl32(s->pb);
01249             int pktct =avio_rl16(s->pb);
01250             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01251             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
01252 
01253             if(pos != last_pos){
01254             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);
01255             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01256             last_pos=pos;
01257             }
01258         }
01259         asf->index_read= 1;
01260     }
01261     avio_seek(s->pb, current_pos, SEEK_SET);
01262 }
01263 
01264 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01265 {
01266     ASFContext *asf = s->priv_data;
01267     AVStream *st = s->streams[stream_index];
01268     int64_t pos;
01269     int index;
01270 
01271     if (s->packet_size <= 0)
01272         return -1;
01273 
01274     /* Try using the protocol's read_seek if available */
01275     if(s->pb) {
01276         int ret = avio_seek_time(s->pb, stream_index, pts, flags);
01277         if(ret >= 0)
01278             asf_reset_header(s);
01279         if (ret != AVERROR(ENOSYS))
01280             return ret;
01281     }
01282 
01283     if (!asf->index_read)
01284         asf_build_simple_index(s, stream_index);
01285 
01286     if((asf->index_read > 0 && st->index_entries)){
01287         index= av_index_search_timestamp(st, pts, flags);
01288         if(index >= 0) {
01289             /* find the position */
01290             pos = st->index_entries[index].pos;
01291 
01292             /* do the seek */
01293             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01294             if(avio_seek(s->pb, pos, SEEK_SET) < 0)
01295                 return -1;
01296             asf_reset_header(s);
01297             return 0;
01298         }
01299     }
01300     /* no index or seeking by index failed */
01301     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
01302         return -1;
01303     asf_reset_header(s);
01304     return 0;
01305 }
01306 
01307 AVInputFormat ff_asf_demuxer = {
01308     .name           = "asf",
01309     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),
01310     .priv_data_size = sizeof(ASFContext),
01311     .read_probe     = asf_probe,
01312     .read_header    = asf_read_header,
01313     .read_packet    = asf_read_packet,
01314     .read_close     = asf_read_close,
01315     .read_seek      = asf_read_seek,
01316     .read_timestamp = asf_read_pts,
01317     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
01318 };