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 "libavcodec/mpegaudio.h"
00029 #include "avformat.h"
00030 #include "avio_internal.h"
00031 #include "riff.h"
00032 #include "asf.h"
00033 #include "asfcrypt.h"
00034 #include "avlanguage.h"
00035 
00036 typedef struct {
00037     int asfid2avid[128];                 
00038     ASFStream streams[128];              
00039     uint32_t stream_bitrates[128];       
00040     AVRational dar[128];
00041     char stream_languages[128][6];       
00042     /* non streamed additonnal info */
00043     /* packet filling */
00044     int packet_size_left;
00045     /* only for reading */
00046     uint64_t data_offset;                
00047     uint64_t data_object_offset;         
00048     uint64_t data_object_size;           
00049     int index_read;
00050 
00051     ASFMainHeader hdr;
00052 
00053     int packet_flags;
00054     int packet_property;
00055     int packet_timestamp;
00056     int packet_segsizetype;
00057     int packet_segments;
00058     int packet_seq;
00059     int packet_replic_size;
00060     int packet_key_frame;
00061     int packet_padsize;
00062     unsigned int packet_frag_offset;
00063     unsigned int packet_frag_size;
00064     int64_t packet_frag_timestamp;
00065     int packet_multi_size;
00066     int packet_obj_size;
00067     int packet_time_delta;
00068     int packet_time_start;
00069     int64_t packet_pos;
00070 
00071     int stream_index;
00072 
00073     ASFStream* asf_st;                   
00074 } ASFContext;
00075 
00076 #undef NDEBUG
00077 #include <assert.h>
00078 
00079 #define ASF_MAX_STREAMS 127
00080 #define FRAME_HEADER_SIZE 17
00081 // Fix Me! FRAME_HEADER_SIZE may be different.
00082 
00083 static const ff_asf_guid index_guid = {
00084     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
00085 };
00086 
00087 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
00088     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
00089 };
00090 /**********************************/
00091 /* decoding */
00092 
00093 #ifdef DEBUG
00094 #define PRINT_IF_GUID(g,cmp) \
00095 if (!ff_guidcmp(g, &cmp)) \
00096     av_dlog(NULL, "(GUID: %s) ", #cmp)
00097 
00098 static void print_guid(const ff_asf_guid *g)
00099 {
00100     int i;
00101     PRINT_IF_GUID(g, ff_asf_header);
00102     else PRINT_IF_GUID(g, ff_asf_file_header);
00103     else PRINT_IF_GUID(g, ff_asf_stream_header);
00104     else PRINT_IF_GUID(g, ff_asf_audio_stream);
00105     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
00106     else PRINT_IF_GUID(g, ff_asf_video_stream);
00107     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
00108     else PRINT_IF_GUID(g, ff_asf_command_stream);
00109     else PRINT_IF_GUID(g, ff_asf_comment_header);
00110     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
00111     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
00112     else PRINT_IF_GUID(g, ff_asf_data_header);
00113     else PRINT_IF_GUID(g, index_guid);
00114     else PRINT_IF_GUID(g, ff_asf_head1_guid);
00115     else PRINT_IF_GUID(g, ff_asf_head2_guid);
00116     else PRINT_IF_GUID(g, ff_asf_my_guid);
00117     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
00118     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
00119     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
00120     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
00121     else PRINT_IF_GUID(g, ff_asf_metadata_header);
00122     else PRINT_IF_GUID(g, ff_asf_marker_header);
00123     else PRINT_IF_GUID(g, stream_bitrate_guid);
00124     else PRINT_IF_GUID(g, ff_asf_language_guid);
00125     else
00126         av_dlog(NULL, "(GUID: unknown) ");
00127     for(i=0;i<16;i++)
00128         av_dlog(NULL, " 0x%02x,", (*g)[i]);
00129     av_dlog(NULL, "}\n");
00130 }
00131 #undef PRINT_IF_GUID
00132 #else
00133 #define print_guid(g)
00134 #endif
00135 
00136 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 && type <= 5) {  // boolean or DWORD or QWORD or WORD
00170         uint64_t num = get_value(s->pb, type);
00171         snprintf(value, len, "%"PRIu64, num);
00172     } else {
00173         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
00174         goto finish;
00175     }
00176     if (*value)
00177         av_dict_set(&s->metadata, key, value, 0);
00178 finish:
00179     av_freep(&value);
00180     avio_seek(s->pb, off + len, SEEK_SET);
00181 }
00182 
00183 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
00184 {
00185     ASFContext *asf = s->priv_data;
00186     AVIOContext *pb = s->pb;
00187 
00188     ff_get_guid(pb, &asf->hdr.guid);
00189     asf->hdr.file_size          = avio_rl64(pb);
00190     asf->hdr.create_time        = avio_rl64(pb);
00191     avio_rl64(pb);                               /* number of packets */
00192     asf->hdr.play_time          = avio_rl64(pb);
00193     asf->hdr.send_time          = avio_rl64(pb);
00194     asf->hdr.preroll            = avio_rl32(pb);
00195     asf->hdr.ignore             = avio_rl32(pb);
00196     asf->hdr.flags              = avio_rl32(pb);
00197     asf->hdr.min_pktsize        = avio_rl32(pb);
00198     asf->hdr.max_pktsize        = avio_rl32(pb);
00199     if (asf->hdr.min_pktsize >= (1U<<29))
00200         return AVERROR_INVALIDDATA;
00201     asf->hdr.max_bitrate        = avio_rl32(pb);
00202     s->packet_size = asf->hdr.max_pktsize;
00203 
00204     return 0;
00205 }
00206 
00207 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
00208 {
00209     ASFContext *asf = s->priv_data;
00210     AVIOContext *pb = s->pb;
00211     AVStream *st;
00212     ASFStream *asf_st;
00213     ff_asf_guid g;
00214     enum AVMediaType type;
00215     int type_specific_size, sizeX;
00216     unsigned int tag1;
00217     int64_t pos1, pos2, start_time;
00218     int test_for_ext_stream_audio, is_dvr_ms_audio=0;
00219 
00220     if (s->nb_streams == ASF_MAX_STREAMS) {
00221         av_log(s, AV_LOG_ERROR, "too many streams\n");
00222         return AVERROR(EINVAL);
00223     }
00224 
00225     pos1 = avio_tell(pb);
00226 
00227     st = av_new_stream(s, 0);
00228     if (!st)
00229         return AVERROR(ENOMEM);
00230     av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00231     asf_st = av_mallocz(sizeof(ASFStream));
00232     if (!asf_st)
00233         return AVERROR(ENOMEM);
00234     st->priv_data = asf_st;
00235     start_time = asf->hdr.preroll;
00236 
00237     asf_st->stream_language_index = 128; // invalid stream index means no language info
00238 
00239     if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00240         st->duration = asf->hdr.play_time /
00241             (10000000 / 1000) - start_time;
00242     }
00243     ff_get_guid(pb, &g);
00244 
00245     test_for_ext_stream_audio = 0;
00246     if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
00247         type = AVMEDIA_TYPE_AUDIO;
00248     } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
00249         type = AVMEDIA_TYPE_VIDEO;
00250     } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
00251         type = AVMEDIA_TYPE_VIDEO;
00252         st->codec->codec_id = CODEC_ID_MJPEG;
00253     } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
00254         type = AVMEDIA_TYPE_DATA;
00255     } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
00256         test_for_ext_stream_audio = 1;
00257         type = AVMEDIA_TYPE_UNKNOWN;
00258     } else {
00259         return -1;
00260     }
00261     ff_get_guid(pb, &g);
00262     avio_skip(pb, 8); /* total_size */
00263     type_specific_size = avio_rl32(pb);
00264     avio_rl32(pb);
00265     st->id = avio_rl16(pb) & 0x7f; /* stream id */
00266     // mapping of asf ID to AV stream ID;
00267     asf->asfid2avid[st->id] = s->nb_streams - 1;
00268 
00269     avio_rl32(pb);
00270 
00271     if (test_for_ext_stream_audio) {
00272         ff_get_guid(pb, &g);
00273         if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
00274             type = AVMEDIA_TYPE_AUDIO;
00275             is_dvr_ms_audio=1;
00276             ff_get_guid(pb, &g);
00277             avio_rl32(pb);
00278             avio_rl32(pb);
00279             avio_rl32(pb);
00280             ff_get_guid(pb, &g);
00281             avio_rl32(pb);
00282         }
00283     }
00284 
00285     st->codec->codec_type = type;
00286     if (type == AVMEDIA_TYPE_AUDIO) {
00287         int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
00288         if (ret < 0)
00289             return ret;
00290         if (is_dvr_ms_audio) {
00291             // codec_id and codec_tag are unreliable in dvr_ms
00292             // files. Set them later by probing stream.
00293             st->request_probe= 1;
00294             st->codec->codec_tag = 0;
00295         }
00296         if (st->codec->codec_id == CODEC_ID_AAC) {
00297             st->need_parsing = AVSTREAM_PARSE_NONE;
00298         } else {
00299             st->need_parsing = AVSTREAM_PARSE_FULL;
00300         }
00301         /* We have to init the frame size at some point .... */
00302         pos2 = avio_tell(pb);
00303         if (size >= (pos2 + 8 - pos1 + 24)) {
00304             asf_st->ds_span = avio_r8(pb);
00305             asf_st->ds_packet_size = avio_rl16(pb);
00306             asf_st->ds_chunk_size = avio_rl16(pb);
00307             avio_rl16(pb); //ds_data_size
00308             avio_r8(pb);   //ds_silence_data
00309         }
00310         //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
00311         //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
00312         //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
00313         if (asf_st->ds_span > 1) {
00314             if (!asf_st->ds_chunk_size
00315                     || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00316                     || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00317                 asf_st->ds_span = 0; // disable descrambling
00318         }
00319         switch (st->codec->codec_id) {
00320             case CODEC_ID_MP3:
00321                 st->codec->frame_size = MPA_FRAME_SIZE;
00322                 break;
00323             case CODEC_ID_PCM_S16LE:
00324             case CODEC_ID_PCM_S16BE:
00325             case CODEC_ID_PCM_U16LE:
00326             case CODEC_ID_PCM_U16BE:
00327             case CODEC_ID_PCM_S8:
00328             case CODEC_ID_PCM_U8:
00329             case CODEC_ID_PCM_ALAW:
00330             case CODEC_ID_PCM_MULAW:
00331                 st->codec->frame_size = 1;
00332                 break;
00333             default:
00334                 /* This is probably wrong, but it prevents a crash later */
00335                 st->codec->frame_size = 1;
00336                 break;
00337         }
00338     } else if (type == AVMEDIA_TYPE_VIDEO &&
00339             size - (avio_tell(pb) - pos1 + 24) >= 51) {
00340         avio_rl32(pb);
00341         avio_rl32(pb);
00342         avio_r8(pb);
00343         avio_rl16(pb);        /* size */
00344         sizeX= avio_rl32(pb); /* size */
00345         st->codec->width = avio_rl32(pb);
00346         st->codec->height = avio_rl32(pb);
00347         /* not available for asf */
00348         avio_rl16(pb); /* panes */
00349         st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
00350         tag1 = avio_rl32(pb);
00351         avio_skip(pb, 20);
00352         //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
00353         if (sizeX > 40) {
00354             st->codec->extradata_size = sizeX - 40;
00355             st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00356             avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00357         }
00358 
00359         /* Extract palette from extradata if bpp <= 8 */
00360         /* This code assumes that extradata contains only palette */
00361         /* This is true for all paletted codecs implemented in ffmpeg */
00362         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00363             int av_unused i;
00364             st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
00365 #if HAVE_BIGENDIAN
00366             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00367                 st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
00368 #else
00369             memcpy(st->codec->palctrl->palette, st->codec->extradata,
00370                     FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00371 #endif
00372             st->codec->palctrl->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         ff_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             int ret = asf_read_file_properties(s, gsize);
00616             if (ret < 0)
00617                 return ret;
00618         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
00619             asf_read_stream_properties(s, gsize);
00620         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00621             asf_read_content_desc(s, gsize);
00622         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00623             asf_read_language_list(s, gsize);
00624         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00625             asf_read_ext_content_desc(s, gsize);
00626         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00627             asf_read_metadata(s, gsize);
00628         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00629             asf_read_ext_stream_properties(s, gsize);
00630 
00631             // there could be a optional stream properties object to follow
00632             // if so the next iteration will pick it up
00633             continue;
00634         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00635             ff_get_guid(pb, &g);
00636             avio_skip(pb, 6);
00637             continue;
00638         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00639             asf_read_marker(s, gsize);
00640         } else if (url_feof(pb)) {
00641             return -1;
00642         } else {
00643             if (!s->keylen) {
00644                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00645                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00646                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00647                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00648                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00649                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
00650                 }
00651             }
00652         }
00653         if(avio_tell(pb) != gpos + gsize)
00654             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
00655         avio_seek(pb, gpos + gsize, SEEK_SET);
00656     }
00657     ff_get_guid(pb, &g);
00658     avio_rl64(pb);
00659     avio_r8(pb);
00660     avio_r8(pb);
00661     if (url_feof(pb))
00662         return -1;
00663     asf->data_offset = avio_tell(pb);
00664     asf->packet_size_left = 0;
00665 
00666 
00667     for(i=0; i<128; i++){
00668         int stream_num= asf->asfid2avid[i];
00669         if(stream_num>=0){
00670             AVStream *st = s->streams[stream_num];
00671             if (!st->codec->bit_rate)
00672                 st->codec->bit_rate = asf->stream_bitrates[i];
00673             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
00674                 av_reduce(&st->sample_aspect_ratio.num,
00675                           &st->sample_aspect_ratio.den,
00676                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
00677             } 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.
00678                 av_reduce(&st->sample_aspect_ratio.num,
00679                           &st->sample_aspect_ratio.den,
00680                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
00681 
00682 //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);
00683 
00684             // copy and convert language codes to the frontend
00685             if (asf->streams[i].stream_language_index < 128) {
00686                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00687                 if (rfc1766 && strlen(rfc1766) > 1) {
00688                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00689                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00690                     if (iso6392)
00691                         av_dict_set(&st->metadata, "language", iso6392, 0);
00692                 }
00693             }
00694         }
00695     }
00696 
00697     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00698 
00699     return 0;
00700 }
00701 
00702 #define DO_2BITS(bits, var, defval) \
00703     switch (bits & 3) \
00704     { \
00705     case 3: var = avio_rl32(pb); rsize += 4; break; \
00706     case 2: var = avio_rl16(pb); rsize += 2; break; \
00707     case 1: var = avio_r8(pb);   rsize++; break; \
00708     default: var = defval; break; \
00709     }
00710 
00717 static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
00718 {
00719     ASFContext *asf = s->priv_data;
00720     uint32_t packet_length, padsize;
00721     int rsize = 8;
00722     int c, d, e, off;
00723 
00724     // if we do not know packet size, allow skipping up to 32 kB
00725     off= 32768;
00726     if (s->packet_size > 0)
00727         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
00728 
00729     c=d=e=-1;
00730     while(off-- > 0){
00731         c=d; d=e;
00732         e= avio_r8(pb);
00733         if(c == 0x82 && !d && !e)
00734             break;
00735     }
00736 
00737     if (c != 0x82) {
00744         if (pb->error == AVERROR(EAGAIN))
00745             return AVERROR(EAGAIN);
00746         if (!url_feof(pb))
00747             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
00748     }
00749     if ((c & 0x8f) == 0x82) {
00750         if (d || e) {
00751             if (!url_feof(pb))
00752                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00753             return -1;
00754         }
00755         c= avio_r8(pb);
00756         d= avio_r8(pb);
00757         rsize+=3;
00758     } else if (!pb->eof_reached) {
00759         avio_seek(pb, -1, SEEK_CUR); //FIXME
00760     }
00761 
00762     asf->packet_flags    = c;
00763     asf->packet_property = d;
00764 
00765     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00766     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00767     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00768 
00769     //the following checks prevent overflows and infinite loops
00770     if(!packet_length || packet_length >= (1U<<29)){
00771         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
00772         return -1;
00773     }
00774     if(padsize >= packet_length){
00775         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
00776         return -1;
00777     }
00778 
00779     asf->packet_timestamp = avio_rl32(pb);
00780     avio_rl16(pb); /* duration */
00781     // rsize has at least 11 bytes which have to be present
00782 
00783     if (asf->packet_flags & 0x01) {
00784         asf->packet_segsizetype = avio_r8(pb); rsize++;
00785         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00786     } else {
00787         asf->packet_segments = 1;
00788         asf->packet_segsizetype = 0x80;
00789     }
00790     if (rsize > packet_length - padsize) {
00791         asf->packet_size_left = 0;
00792         av_log(s, AV_LOG_ERROR,
00793                "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
00794                rsize, packet_length, padsize, avio_tell(pb));
00795         return -1;
00796     }
00797     asf->packet_size_left = packet_length - padsize - rsize;
00798     if (packet_length < asf->hdr.min_pktsize)
00799         padsize += asf->hdr.min_pktsize - packet_length;
00800     asf->packet_padsize = padsize;
00801     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00802     return 0;
00803 }
00804 
00809 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
00810     ASFContext *asf = s->priv_data;
00811     int rsize = 1;
00812     int num = avio_r8(pb);
00813     int64_t ts0;
00814 
00815     asf->packet_segments--;
00816     asf->packet_key_frame = num >> 7;
00817     asf->stream_index = asf->asfid2avid[num & 0x7f];
00818     // sequence should be ignored!
00819     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00820     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00821     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00822 //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);
00823     if (rsize+asf->packet_replic_size > asf->packet_size_left) {
00824         av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
00825         return -1;
00826     }
00827     if (asf->packet_replic_size >= 8) {
00828         asf->packet_obj_size = avio_rl32(pb);
00829         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00830             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00831             return -1;
00832         }
00833         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
00834         if(asf->packet_replic_size >= 8+38+4){
00835 //            for(i=0; i<asf->packet_replic_size-8; i++)
00836 //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
00837 //            av_log(s, AV_LOG_DEBUG, "\n");
00838             avio_skip(pb, 10);
00839             ts0= avio_rl64(pb);
00840             avio_skip(pb, 8);;
00841             avio_skip(pb, 12);
00842             avio_rl32(pb);
00843             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
00844             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00845             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00846         }else
00847             avio_skip(pb, asf->packet_replic_size - 8);
00848         rsize += asf->packet_replic_size; // FIXME - check validity
00849     } else if (asf->packet_replic_size==1){
00850         // multipacket - frag_offset is beginning timestamp
00851         asf->packet_time_start = asf->packet_frag_offset;
00852         asf->packet_frag_offset = 0;
00853         asf->packet_frag_timestamp = asf->packet_timestamp;
00854 
00855         asf->packet_time_delta = avio_r8(pb);
00856         rsize++;
00857     }else if(asf->packet_replic_size!=0){
00858         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00859         return -1;
00860     }
00861     if (asf->packet_flags & 0x01) {
00862         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00863         if (rsize > asf->packet_size_left) {
00864             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00865             return -1;
00866         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
00867             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
00868                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
00869                 return -1;
00870             } else {
00871                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
00872                 asf->packet_size_left += diff;
00873                 asf->packet_padsize   -= diff;
00874             }
00875         }
00876         //printf("Fragsize %d\n", asf->packet_frag_size);
00877     } else {
00878         asf->packet_frag_size = asf->packet_size_left - rsize;
00879         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00880     }
00881     if (asf->packet_replic_size == 1) {
00882         asf->packet_multi_size = asf->packet_frag_size;
00883         if (asf->packet_multi_size > asf->packet_size_left)
00884             return -1;
00885     }
00886     asf->packet_size_left -= rsize;
00887     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00888 
00889     return 0;
00890 }
00891 
00901 static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
00902 {
00903     ASFContext *asf = s->priv_data;
00904     ASFStream *asf_st = 0;
00905     for (;;) {
00906         int ret;
00907         if(url_feof(pb))
00908             return AVERROR_EOF;
00909         if (asf->packet_size_left < FRAME_HEADER_SIZE
00910             || asf->packet_segments < 1) {
00911             //asf->packet_size_left <= asf->packet_padsize) {
00912             int ret = asf->packet_size_left + asf->packet_padsize;
00913             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));
00914             assert(ret>=0);
00915             /* fail safe */
00916             avio_skip(pb, ret);
00917 
00918             asf->packet_pos= avio_tell(pb);
00919             if (asf->data_object_size != (uint64_t)-1 &&
00920                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00921                 return AVERROR_EOF; /* Do not exceed the size of the data object */
00922             return 1;
00923         }
00924         if (asf->packet_time_start == 0) {
00925             if(asf_read_frame_header(s, pb) < 0){
00926                 asf->packet_segments= 0;
00927                 continue;
00928             }
00929             if (asf->stream_index < 0
00930                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00931                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00932                 ) {
00933                 asf->packet_time_start = 0;
00934                 /* unhandled packet (should not happen) */
00935                 avio_skip(pb, asf->packet_frag_size);
00936                 asf->packet_size_left -= asf->packet_frag_size;
00937                 if(asf->stream_index < 0)
00938                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00939                 continue;
00940             }
00941             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00942         }
00943         asf_st = asf->asf_st;
00944 
00945         if (asf->packet_replic_size == 1) {
00946             // frag_offset is here used as the beginning timestamp
00947             asf->packet_frag_timestamp = asf->packet_time_start;
00948             asf->packet_time_start += asf->packet_time_delta;
00949             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
00950             asf->packet_size_left--;
00951             asf->packet_multi_size--;
00952             if (asf->packet_multi_size < asf->packet_obj_size)
00953             {
00954                 asf->packet_time_start = 0;
00955                 avio_skip(pb, asf->packet_multi_size);
00956                 asf->packet_size_left -= asf->packet_multi_size;
00957                 continue;
00958             }
00959             asf->packet_multi_size -= asf->packet_obj_size;
00960             //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);
00961         }
00962         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00963               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00964            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00965             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00966                 asf_st->frag_offset, asf->packet_frag_size,
00967                 asf->packet_obj_size, asf_st->pkt.size);
00968             asf->packet_obj_size= asf_st->pkt.size;
00969         }
00970 
00971         if (   asf_st->pkt.size != asf->packet_obj_size
00972             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00973             if(asf_st->pkt.data){
00974                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00975                 asf_st->frag_offset = 0;
00976                 av_free_packet(&asf_st->pkt);
00977             }
00978             /* new packet */
00979             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00980             asf_st->seq = asf->packet_seq;
00981             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
00982             asf_st->pkt.stream_index = asf->stream_index;
00983             asf_st->pkt.pos =
00984             asf_st->packet_pos= asf->packet_pos;
00985 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
00986 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
00987 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
00988             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
00989                 asf->packet_key_frame = 1;
00990             if (asf->packet_key_frame)
00991                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
00992         }
00993 
00994         /* read data */
00995         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
00996         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
00997         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
00998         asf->packet_size_left -= asf->packet_frag_size;
00999         if (asf->packet_size_left < 0)
01000             continue;
01001 
01002         if(   asf->packet_frag_offset >= asf_st->pkt.size
01003            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
01004             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
01005                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
01006             continue;
01007         }
01008 
01009         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
01010                          asf->packet_frag_size);
01011         if (ret != asf->packet_frag_size) {
01012             if (ret < 0 || asf->packet_frag_offset + ret == 0)
01013                 return ret < 0 ? ret : AVERROR_EOF;
01014             if (asf_st->ds_span > 1) {
01015                 // scrambling, we can either drop it completely or fill the remainder
01016                 // TODO: should we fill the whole packet instead of just the current
01017                 // fragment?
01018                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
01019                        asf->packet_frag_size - ret);
01020                 ret = asf->packet_frag_size;
01021             } else
01022                 // no scrambling, so we can return partial packets
01023                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
01024         }
01025         if (s->key && s->keylen == 20)
01026             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
01027                             ret);
01028         asf_st->frag_offset += ret;
01029         /* test if whole packet is read */
01030         if (asf_st->frag_offset == asf_st->pkt.size) {
01031             //workaround for macroshit radio DVR-MS files
01032             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
01033                && asf_st->pkt.size > 100){
01034                 int i;
01035                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
01036                 if(i == asf_st->pkt.size){
01037                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
01038                     asf_st->frag_offset = 0;
01039                     av_free_packet(&asf_st->pkt);
01040                     continue;
01041                 }
01042             }
01043 
01044             /* return packet */
01045             if (asf_st->ds_span > 1) {
01046               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
01047                     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);
01048               }else{
01049                 /* packet descrambling */
01050                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
01051                 if (newdata) {
01052                     int offset = 0;
01053                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
01054                     while (offset < asf_st->pkt.size) {
01055                         int off = offset / asf_st->ds_chunk_size;
01056                         int row = off / asf_st->ds_span;
01057                         int col = off % asf_st->ds_span;
01058                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
01059                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
01060 
01061                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
01062                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
01063                         memcpy(newdata + offset,
01064                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
01065                                asf_st->ds_chunk_size);
01066                         offset += asf_st->ds_chunk_size;
01067                     }
01068                     av_free(asf_st->pkt.data);
01069                     asf_st->pkt.data = newdata;
01070                 }
01071               }
01072             }
01073             asf_st->frag_offset = 0;
01074             *pkt= asf_st->pkt;
01075             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
01076             asf_st->pkt.size = 0;
01077             asf_st->pkt.data = 0;
01078             break; // packet completed
01079         }
01080     }
01081     return 0;
01082 }
01083 
01084 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
01085 {
01086     ASFContext *asf = s->priv_data;
01087 
01088     for (;;) {
01089         int ret;
01090 
01091         /* parse cached packets, if any */
01092         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
01093             return ret;
01094         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
01095             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
01096         asf->packet_time_start = 0;
01097     }
01098 
01099     return 0;
01100 }
01101 
01102 // Added to support seeking after packets have been read
01103 // If information is not reset, read_packet fails due to
01104 // leftover information from previous reads
01105 static void asf_reset_header(AVFormatContext *s)
01106 {
01107     ASFContext *asf = s->priv_data;
01108     ASFStream *asf_st;
01109     int i;
01110 
01111     asf->packet_size_left = 0;
01112     asf->packet_segments = 0;
01113     asf->packet_flags = 0;
01114     asf->packet_property = 0;
01115     asf->packet_timestamp = 0;
01116     asf->packet_segsizetype = 0;
01117     asf->packet_segments = 0;
01118     asf->packet_seq = 0;
01119     asf->packet_replic_size = 0;
01120     asf->packet_key_frame = 0;
01121     asf->packet_padsize = 0;
01122     asf->packet_frag_offset = 0;
01123     asf->packet_frag_size = 0;
01124     asf->packet_frag_timestamp = 0;
01125     asf->packet_multi_size = 0;
01126     asf->packet_obj_size = 0;
01127     asf->packet_time_delta = 0;
01128     asf->packet_time_start = 0;
01129 
01130     for(i=0; i<s->nb_streams; i++){
01131         asf_st= s->streams[i]->priv_data;
01132         av_free_packet(&asf_st->pkt);
01133         asf_st->frag_offset=0;
01134         asf_st->seq=0;
01135     }
01136     asf->asf_st= NULL;
01137 }
01138 
01139 static int asf_read_close(AVFormatContext *s)
01140 {
01141     int i;
01142     asf_reset_header(s);
01143 
01144     for(i=0;i<s->nb_streams;i++) {
01145         AVStream *st = s->streams[i];
01146         av_free(st->codec->palctrl);
01147     }
01148 
01149     return 0;
01150 }
01151 
01152 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01153 {
01154     AVPacket pkt1, *pkt = &pkt1;
01155     ASFStream *asf_st;
01156     int64_t pts;
01157     int64_t pos= *ppos;
01158     int i;
01159     int64_t start_pos[ASF_MAX_STREAMS];
01160 
01161     for(i=0; i<s->nb_streams; i++){
01162         start_pos[i]= pos;
01163     }
01164 
01165     if (s->packet_size > 0)
01166         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01167     *ppos= pos;
01168     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
01169         return AV_NOPTS_VALUE;
01170 
01171 //printf("asf_read_pts\n");
01172     asf_reset_header(s);
01173     for(;;){
01174         if (av_read_frame(s, pkt) < 0){
01175             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01176             return AV_NOPTS_VALUE;
01177         }
01178 
01179         pts= pkt->pts;
01180 
01181         av_free_packet(pkt);
01182         if(pkt->flags&AV_PKT_FLAG_KEY){
01183             i= pkt->stream_index;
01184 
01185             asf_st= s->streams[i]->priv_data;
01186 
01187 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01188             pos= asf_st->packet_pos;
01189 
01190             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01191             start_pos[i]= asf_st->packet_pos + 1;
01192 
01193             if(pkt->stream_index == stream_index)
01194                break;
01195         }
01196     }
01197 
01198     *ppos= pos;
01199 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01200 
01201     return pts;
01202 }
01203 
01204 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01205 {
01206     ff_asf_guid g;
01207     ASFContext *asf = s->priv_data;
01208     int64_t current_pos= avio_tell(s->pb);
01209     int i;
01210 
01211     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0)
01212         return;
01213 
01214     ff_get_guid(s->pb, &g);
01215 
01216     /* the data object can be followed by other top-level objects,
01217        skip them until the simple index object is reached */
01218     while (ff_guidcmp(&g, &index_guid)) {
01219         int64_t gsize= avio_rl64(s->pb);
01220         if (gsize < 24 || url_feof(s->pb)) {
01221             avio_seek(s->pb, current_pos, SEEK_SET);
01222             return;
01223         }
01224         avio_skip(s->pb, gsize-24);
01225         ff_get_guid(s->pb, &g);
01226     }
01227 
01228     {
01229         int64_t itime, last_pos=-1;
01230         int pct, ict;
01231         int64_t av_unused gsize= avio_rl64(s->pb);
01232         ff_get_guid(s->pb, &g);
01233         itime=avio_rl64(s->pb);
01234         pct=avio_rl32(s->pb);
01235         ict=avio_rl32(s->pb);
01236         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01237 
01238         for (i=0;i<ict;i++){
01239             int pktnum=avio_rl32(s->pb);
01240             int pktct =avio_rl16(s->pb);
01241             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01242             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
01243 
01244             if(pos != last_pos){
01245             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);
01246             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01247             last_pos=pos;
01248             }
01249         }
01250         asf->index_read= 1;
01251     }
01252     avio_seek(s->pb, current_pos, SEEK_SET);
01253 }
01254 
01255 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01256 {
01257     ASFContext *asf = s->priv_data;
01258     AVStream *st = s->streams[stream_index];
01259     int64_t pos;
01260     int index;
01261 
01262     if (s->packet_size <= 0)
01263         return -1;
01264 
01265     /* Try using the protocol's read_seek if available */
01266     if(s->pb) {
01267         int ret = avio_seek_time(s->pb, stream_index, pts, flags);
01268         if(ret >= 0)
01269             asf_reset_header(s);
01270         if (ret != AVERROR(ENOSYS))
01271             return ret;
01272     }
01273 
01274     if (!asf->index_read)
01275         asf_build_simple_index(s, stream_index);
01276 
01277     if((asf->index_read && st->index_entries)){
01278         index= av_index_search_timestamp(st, pts, flags);
01279         if(index >= 0) {
01280             /* find the position */
01281             pos = st->index_entries[index].pos;
01282 
01283             /* do the seek */
01284             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01285             if(avio_seek(s->pb, pos, SEEK_SET) < 0)
01286                 return -1;
01287             asf_reset_header(s);
01288             return 0;
01289         }
01290     }
01291     /* no index or seeking by index failed */
01292     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
01293         return -1;
01294     asf_reset_header(s);
01295     return 0;
01296 }
01297 
01298 AVInputFormat ff_asf_demuxer = {
01299     "asf",
01300     NULL_IF_CONFIG_SMALL("ASF format"),
01301     sizeof(ASFContext),
01302     asf_probe,
01303     asf_read_header,
01304     asf_read_packet,
01305     asf_read_close,
01306     asf_read_seek,
01307     asf_read_pts,
01308     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
01309 };