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 #if HAVE_BIGENDIAN
00365             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00366                 asf_st->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
00367 #else
00368             memcpy(asf_st->palette, st->codec->extradata,
00369                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00370 #endif
00371             asf_st->palette_changed = 1;
00372         }
00373 
00374         st->codec->codec_tag = tag1;
00375         st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00376         if(tag1 == MKTAG('D', 'V', 'R', ' ')){
00377             st->need_parsing = AVSTREAM_PARSE_FULL;
00378             // 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
00379             st->codec->width  =
00380                 st->codec->height = 0;
00381             av_freep(&st->codec->extradata);
00382             st->codec->extradata_size=0;
00383         }
00384         if(st->codec->codec_id == CODEC_ID_H264)
00385             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
00386     }
00387     pos2 = avio_tell(pb);
00388     avio_skip(pb, size - (pos2 - pos1 + 24));
00389 
00390     return 0;
00391 }
00392 
00393 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
00394 {
00395     ASFContext *asf = s->priv_data;
00396     AVIOContext *pb = s->pb;
00397     ff_asf_guid g;
00398     int ext_len, payload_ext_ct, stream_ct, i;
00399     uint32_t leak_rate, stream_num;
00400     unsigned int stream_languageid_index;
00401 
00402     avio_rl64(pb); // starttime
00403     avio_rl64(pb); // endtime
00404     leak_rate = avio_rl32(pb); // leak-datarate
00405     avio_rl32(pb); // bucket-datasize
00406     avio_rl32(pb); // init-bucket-fullness
00407     avio_rl32(pb); // alt-leak-datarate
00408     avio_rl32(pb); // alt-bucket-datasize
00409     avio_rl32(pb); // alt-init-bucket-fullness
00410     avio_rl32(pb); // max-object-size
00411     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00412     stream_num = avio_rl16(pb); // stream-num
00413 
00414     stream_languageid_index = avio_rl16(pb); // stream-language-id-index
00415     if (stream_num < 128)
00416         asf->streams[stream_num].stream_language_index = stream_languageid_index;
00417 
00418     avio_rl64(pb); // avg frametime in 100ns units
00419     stream_ct = avio_rl16(pb); //stream-name-count
00420     payload_ext_ct = avio_rl16(pb); //payload-extension-system-count
00421 
00422     if (stream_num < 128)
00423         asf->stream_bitrates[stream_num] = leak_rate;
00424 
00425     for (i=0; i<stream_ct; i++){
00426         avio_rl16(pb);
00427         ext_len = avio_rl16(pb);
00428         avio_skip(pb, ext_len);
00429     }
00430 
00431     for (i=0; i<payload_ext_ct; i++){
00432         ff_get_guid(pb, &g);
00433         avio_skip(pb, 2);
00434         ext_len=avio_rl32(pb);
00435         avio_skip(pb, ext_len);
00436     }
00437 
00438     return 0;
00439 }
00440 
00441 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
00442 {
00443     AVIOContext *pb = s->pb;
00444     int len1, len2, len3, len4, len5;
00445 
00446     len1 = avio_rl16(pb);
00447     len2 = avio_rl16(pb);
00448     len3 = avio_rl16(pb);
00449     len4 = avio_rl16(pb);
00450     len5 = avio_rl16(pb);
00451     get_tag(s, "title"    , 0, len1);
00452     get_tag(s, "author"   , 0, len2);
00453     get_tag(s, "copyright", 0, len3);
00454     get_tag(s, "comment"  , 0, len4);
00455     avio_skip(pb, len5);
00456 
00457     return 0;
00458 }
00459 
00460 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
00461 {
00462     AVIOContext *pb = s->pb;
00463     ASFContext *asf = s->priv_data;
00464     int desc_count, i, ret;
00465 
00466     desc_count = avio_rl16(pb);
00467     for(i=0;i<desc_count;i++) {
00468         int name_len,value_type,value_len;
00469         char name[1024];
00470 
00471         name_len = avio_rl16(pb);
00472         if (name_len%2)     // must be even, broken lavf versions wrote len-1
00473             name_len += 1;
00474         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00475             avio_skip(pb, name_len - ret);
00476         value_type = avio_rl16(pb);
00477         value_len  = avio_rl16(pb);
00478         if (!value_type && value_len%2)
00479             value_len += 1;
00484         if (!strcmp(name, "AspectRatioX")){
00485             asf->dar[0].num= get_value(s->pb, value_type);
00486         } else if(!strcmp(name, "AspectRatioY")){
00487             asf->dar[0].den= get_value(s->pb, value_type);
00488         } else
00489             get_tag(s, name, value_type, value_len);
00490     }
00491 
00492     return 0;
00493 }
00494 
00495 static int asf_read_language_list(AVFormatContext *s, int64_t size)
00496 {
00497     AVIOContext *pb = s->pb;
00498     ASFContext *asf = s->priv_data;
00499     int j, ret;
00500     int stream_count = avio_rl16(pb);
00501     for(j = 0; j < stream_count; j++) {
00502         char lang[6];
00503         unsigned int lang_len = avio_r8(pb);
00504         if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
00505             avio_skip(pb, lang_len - ret);
00506         if (j < 128)
00507             av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
00508     }
00509 
00510     return 0;
00511 }
00512 
00513 static int asf_read_metadata(AVFormatContext *s, int64_t size)
00514 {
00515     AVIOContext *pb = s->pb;
00516     ASFContext *asf = s->priv_data;
00517     int n, stream_num, name_len, value_len, value_num;
00518     int ret, i;
00519     n = avio_rl16(pb);
00520 
00521     for(i=0;i<n;i++) {
00522         char name[1024];
00523 
00524         avio_rl16(pb); //lang_list_index
00525         stream_num= avio_rl16(pb);
00526         name_len=   avio_rl16(pb);
00527         avio_skip(pb, 2); /* value_type */
00528         value_len=  avio_rl32(pb);
00529 
00530         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00531             avio_skip(pb, name_len - ret);
00532         //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
00533         value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00534         avio_skip(pb, value_len - 2);
00535 
00536         if(stream_num<128){
00537             if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
00538             else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
00539         }
00540     }
00541 
00542     return 0;
00543 }
00544 
00545 static int asf_read_marker(AVFormatContext *s, int64_t size)
00546 {
00547     AVIOContext *pb = s->pb;
00548     int i, count, name_len, ret;
00549     char name[1024];
00550 
00551     avio_rl64(pb);            // reserved 16 bytes
00552     avio_rl64(pb);            // ...
00553     count = avio_rl32(pb);    // markers count
00554     avio_rl16(pb);            // reserved 2 bytes
00555     name_len = avio_rl16(pb); // name length
00556     for(i=0;i<name_len;i++){
00557         avio_r8(pb); // skip the name
00558     }
00559 
00560     for(i=0;i<count;i++){
00561         int64_t pres_time;
00562         int name_len;
00563 
00564         avio_rl64(pb);             // offset, 8 bytes
00565         pres_time = avio_rl64(pb); // presentation time
00566         avio_rl16(pb);             // entry length
00567         avio_rl32(pb);             // send time
00568         avio_rl32(pb);             // flags
00569         name_len = avio_rl32(pb);  // name length
00570         if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
00571             avio_skip(pb, name_len - ret);
00572         ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
00573     }
00574 
00575     return 0;
00576 }
00577 
00578 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
00579 {
00580     ASFContext *asf = s->priv_data;
00581     ff_asf_guid g;
00582     AVIOContext *pb = s->pb;
00583     int i;
00584     int64_t gsize;
00585 
00586     ff_get_guid(pb, &g);
00587     if (ff_guidcmp(&g, &ff_asf_header))
00588         return -1;
00589     avio_rl64(pb);
00590     avio_rl32(pb);
00591     avio_r8(pb);
00592     avio_r8(pb);
00593     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00594     for(;;) {
00595         uint64_t gpos= avio_tell(pb);
00596         ff_get_guid(pb, &g);
00597         gsize = avio_rl64(pb);
00598         av_dlog(s, "%08"PRIx64": ", gpos);
00599         print_guid(&g);
00600         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
00601         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
00602             asf->data_object_offset = avio_tell(pb);
00603             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00604             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00605                 asf->data_object_size = gsize - 24;
00606             } else {
00607                 asf->data_object_size = (uint64_t)-1;
00608             }
00609             break;
00610         }
00611         if (gsize < 24)
00612             return -1;
00613         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
00614             int ret = asf_read_file_properties(s, gsize);
00615             if (ret < 0)
00616                 return ret;
00617         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
00618             asf_read_stream_properties(s, gsize);
00619         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00620             asf_read_content_desc(s, gsize);
00621         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00622             asf_read_language_list(s, gsize);
00623         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00624             asf_read_ext_content_desc(s, gsize);
00625         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00626             asf_read_metadata(s, gsize);
00627         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00628             asf_read_ext_stream_properties(s, gsize);
00629 
00630             // there could be a optional stream properties object to follow
00631             // if so the next iteration will pick it up
00632             continue;
00633         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00634             ff_get_guid(pb, &g);
00635             avio_skip(pb, 6);
00636             continue;
00637         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00638             asf_read_marker(s, gsize);
00639         } else if (url_feof(pb)) {
00640             return -1;
00641         } else {
00642             if (!s->keylen) {
00643                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00644                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00645                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00646                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00647                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00648                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
00649                 }
00650             }
00651         }
00652         if(avio_tell(pb) != gpos + gsize)
00653             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
00654         avio_seek(pb, gpos + gsize, SEEK_SET);
00655     }
00656     ff_get_guid(pb, &g);
00657     avio_rl64(pb);
00658     avio_r8(pb);
00659     avio_r8(pb);
00660     if (url_feof(pb))
00661         return -1;
00662     asf->data_offset = avio_tell(pb);
00663     asf->packet_size_left = 0;
00664 
00665 
00666     for(i=0; i<128; i++){
00667         int stream_num= asf->asfid2avid[i];
00668         if(stream_num>=0){
00669             AVStream *st = s->streams[stream_num];
00670             if (!st->codec->bit_rate)
00671                 st->codec->bit_rate = asf->stream_bitrates[i];
00672             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
00673                 av_reduce(&st->sample_aspect_ratio.num,
00674                           &st->sample_aspect_ratio.den,
00675                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
00676             } 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.
00677                 av_reduce(&st->sample_aspect_ratio.num,
00678                           &st->sample_aspect_ratio.den,
00679                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
00680 
00681 //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);
00682 
00683             // copy and convert language codes to the frontend
00684             if (asf->streams[i].stream_language_index < 128) {
00685                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00686                 if (rfc1766 && strlen(rfc1766) > 1) {
00687                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00688                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00689                     if (iso6392)
00690                         av_dict_set(&st->metadata, "language", iso6392, 0);
00691                 }
00692             }
00693         }
00694     }
00695 
00696     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00697 
00698     return 0;
00699 }
00700 
00701 #define DO_2BITS(bits, var, defval) \
00702     switch (bits & 3) \
00703     { \
00704     case 3: var = avio_rl32(pb); rsize += 4; break; \
00705     case 2: var = avio_rl16(pb); rsize += 2; break; \
00706     case 1: var = avio_r8(pb);   rsize++; break; \
00707     default: var = defval; break; \
00708     }
00709 
00716 static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
00717 {
00718     ASFContext *asf = s->priv_data;
00719     uint32_t packet_length, padsize;
00720     int rsize = 8;
00721     int c, d, e, off;
00722 
00723     // if we do not know packet size, allow skipping up to 32 kB
00724     off= 32768;
00725     if (s->packet_size > 0)
00726         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
00727 
00728     c=d=e=-1;
00729     while(off-- > 0){
00730         c=d; d=e;
00731         e= avio_r8(pb);
00732         if(c == 0x82 && !d && !e)
00733             break;
00734     }
00735 
00736     if (c != 0x82) {
00743         if (pb->error == AVERROR(EAGAIN))
00744             return AVERROR(EAGAIN);
00745         if (!url_feof(pb))
00746             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
00747     }
00748     if ((c & 0x8f) == 0x82) {
00749         if (d || e) {
00750             if (!url_feof(pb))
00751                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00752             return -1;
00753         }
00754         c= avio_r8(pb);
00755         d= avio_r8(pb);
00756         rsize+=3;
00757     } else if (!pb->eof_reached) {
00758         avio_seek(pb, -1, SEEK_CUR); //FIXME
00759     }
00760 
00761     asf->packet_flags    = c;
00762     asf->packet_property = d;
00763 
00764     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00765     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00766     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00767 
00768     //the following checks prevent overflows and infinite loops
00769     if(!packet_length || packet_length >= (1U<<29)){
00770         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
00771         return -1;
00772     }
00773     if(padsize >= packet_length){
00774         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
00775         return -1;
00776     }
00777 
00778     asf->packet_timestamp = avio_rl32(pb);
00779     avio_rl16(pb); /* duration */
00780     // rsize has at least 11 bytes which have to be present
00781 
00782     if (asf->packet_flags & 0x01) {
00783         asf->packet_segsizetype = avio_r8(pb); rsize++;
00784         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00785     } else {
00786         asf->packet_segments = 1;
00787         asf->packet_segsizetype = 0x80;
00788     }
00789     if (rsize > packet_length - padsize) {
00790         asf->packet_size_left = 0;
00791         av_log(s, AV_LOG_ERROR,
00792                "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
00793                rsize, packet_length, padsize, avio_tell(pb));
00794         return -1;
00795     }
00796     asf->packet_size_left = packet_length - padsize - rsize;
00797     if (packet_length < asf->hdr.min_pktsize)
00798         padsize += asf->hdr.min_pktsize - packet_length;
00799     asf->packet_padsize = padsize;
00800     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00801     return 0;
00802 }
00803 
00808 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
00809     ASFContext *asf = s->priv_data;
00810     int rsize = 1;
00811     int num = avio_r8(pb);
00812     int64_t ts0;
00813 
00814     asf->packet_segments--;
00815     asf->packet_key_frame = num >> 7;
00816     asf->stream_index = asf->asfid2avid[num & 0x7f];
00817     // sequence should be ignored!
00818     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00819     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00820     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00821 //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);
00822     if (rsize+asf->packet_replic_size > asf->packet_size_left) {
00823         av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
00824         return -1;
00825     }
00826     if (asf->packet_replic_size >= 8) {
00827         asf->packet_obj_size = avio_rl32(pb);
00828         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00829             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00830             return -1;
00831         }
00832         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
00833         if(asf->packet_replic_size >= 8+38+4){
00834 //            for(i=0; i<asf->packet_replic_size-8; i++)
00835 //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
00836 //            av_log(s, AV_LOG_DEBUG, "\n");
00837             avio_skip(pb, 10);
00838             ts0= avio_rl64(pb);
00839             avio_skip(pb, 8);;
00840             avio_skip(pb, 12);
00841             avio_rl32(pb);
00842             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
00843             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00844             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00845         }else
00846             avio_skip(pb, asf->packet_replic_size - 8);
00847         rsize += asf->packet_replic_size; // FIXME - check validity
00848     } else if (asf->packet_replic_size==1){
00849         // multipacket - frag_offset is beginning timestamp
00850         asf->packet_time_start = asf->packet_frag_offset;
00851         asf->packet_frag_offset = 0;
00852         asf->packet_frag_timestamp = asf->packet_timestamp;
00853 
00854         asf->packet_time_delta = avio_r8(pb);
00855         rsize++;
00856     }else if(asf->packet_replic_size!=0){
00857         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00858         return -1;
00859     }
00860     if (asf->packet_flags & 0x01) {
00861         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00862         if (rsize > asf->packet_size_left) {
00863             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00864             return -1;
00865         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
00866             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
00867                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
00868                 return -1;
00869             } else {
00870                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
00871                 asf->packet_size_left += diff;
00872                 asf->packet_padsize   -= diff;
00873             }
00874         }
00875         //printf("Fragsize %d\n", asf->packet_frag_size);
00876     } else {
00877         asf->packet_frag_size = asf->packet_size_left - rsize;
00878         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00879     }
00880     if (asf->packet_replic_size == 1) {
00881         asf->packet_multi_size = asf->packet_frag_size;
00882         if (asf->packet_multi_size > asf->packet_size_left)
00883             return -1;
00884     }
00885     asf->packet_size_left -= rsize;
00886     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00887 
00888     return 0;
00889 }
00890 
00900 static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
00901 {
00902     ASFContext *asf = s->priv_data;
00903     ASFStream *asf_st = 0;
00904     for (;;) {
00905         int ret;
00906         if(url_feof(pb))
00907             return AVERROR_EOF;
00908         if (asf->packet_size_left < FRAME_HEADER_SIZE
00909             || asf->packet_segments < 1) {
00910             //asf->packet_size_left <= asf->packet_padsize) {
00911             int ret = asf->packet_size_left + asf->packet_padsize;
00912             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));
00913             assert(ret>=0);
00914             /* fail safe */
00915             avio_skip(pb, ret);
00916 
00917             asf->packet_pos= avio_tell(pb);
00918             if (asf->data_object_size != (uint64_t)-1 &&
00919                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00920                 return AVERROR_EOF; /* Do not exceed the size of the data object */
00921             return 1;
00922         }
00923         if (asf->packet_time_start == 0) {
00924             if(asf_read_frame_header(s, pb) < 0){
00925                 asf->packet_segments= 0;
00926                 continue;
00927             }
00928             if (asf->stream_index < 0
00929                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00930                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00931                 ) {
00932                 asf->packet_time_start = 0;
00933                 /* unhandled packet (should not happen) */
00934                 avio_skip(pb, asf->packet_frag_size);
00935                 asf->packet_size_left -= asf->packet_frag_size;
00936                 if(asf->stream_index < 0)
00937                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00938                 continue;
00939             }
00940             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00941         }
00942         asf_st = asf->asf_st;
00943 
00944         if (asf->packet_replic_size == 1) {
00945             // frag_offset is here used as the beginning timestamp
00946             asf->packet_frag_timestamp = asf->packet_time_start;
00947             asf->packet_time_start += asf->packet_time_delta;
00948             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
00949             asf->packet_size_left--;
00950             asf->packet_multi_size--;
00951             if (asf->packet_multi_size < asf->packet_obj_size)
00952             {
00953                 asf->packet_time_start = 0;
00954                 avio_skip(pb, asf->packet_multi_size);
00955                 asf->packet_size_left -= asf->packet_multi_size;
00956                 continue;
00957             }
00958             asf->packet_multi_size -= asf->packet_obj_size;
00959             //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);
00960         }
00961         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00962               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00963            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00964             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00965                 asf_st->frag_offset, asf->packet_frag_size,
00966                 asf->packet_obj_size, asf_st->pkt.size);
00967             asf->packet_obj_size= asf_st->pkt.size;
00968         }
00969 
00970         if (   asf_st->pkt.size != asf->packet_obj_size
00971             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00972             if(asf_st->pkt.data){
00973                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00974                 asf_st->frag_offset = 0;
00975                 av_free_packet(&asf_st->pkt);
00976             }
00977             /* new packet */
00978             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00979             asf_st->seq = asf->packet_seq;
00980             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
00981             asf_st->pkt.stream_index = asf->stream_index;
00982             asf_st->pkt.pos =
00983             asf_st->packet_pos= asf->packet_pos;
00984             if (asf_st->pkt.data && asf_st->palette_changed) {
00985                 uint8_t *pal;
00986                 pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
00987                                               AVPALETTE_SIZE);
00988                 if (!pal) {
00989                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
00990                 } else {
00991                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
00992                     asf_st->palette_changed = 0;
00993                 }
00994             }
00995 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
00996 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
00997 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
00998             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
00999                 asf->packet_key_frame = 1;
01000             if (asf->packet_key_frame)
01001                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
01002         }
01003 
01004         /* read data */
01005         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
01006         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
01007         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
01008         asf->packet_size_left -= asf->packet_frag_size;
01009         if (asf->packet_size_left < 0)
01010             continue;
01011 
01012         if(   asf->packet_frag_offset >= asf_st->pkt.size
01013            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
01014             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
01015                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
01016             continue;
01017         }
01018 
01019         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
01020                          asf->packet_frag_size);
01021         if (ret != asf->packet_frag_size) {
01022             if (ret < 0 || asf->packet_frag_offset + ret == 0)
01023                 return ret < 0 ? ret : AVERROR_EOF;
01024             if (asf_st->ds_span > 1) {
01025                 // scrambling, we can either drop it completely or fill the remainder
01026                 // TODO: should we fill the whole packet instead of just the current
01027                 // fragment?
01028                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
01029                        asf->packet_frag_size - ret);
01030                 ret = asf->packet_frag_size;
01031             } else
01032                 // no scrambling, so we can return partial packets
01033                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
01034         }
01035         if (s->key && s->keylen == 20)
01036             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
01037                             ret);
01038         asf_st->frag_offset += ret;
01039         /* test if whole packet is read */
01040         if (asf_st->frag_offset == asf_st->pkt.size) {
01041             //workaround for macroshit radio DVR-MS files
01042             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
01043                && asf_st->pkt.size > 100){
01044                 int i;
01045                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
01046                 if(i == asf_st->pkt.size){
01047                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
01048                     asf_st->frag_offset = 0;
01049                     av_free_packet(&asf_st->pkt);
01050                     continue;
01051                 }
01052             }
01053 
01054             /* return packet */
01055             if (asf_st->ds_span > 1) {
01056               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
01057                     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);
01058               }else{
01059                 /* packet descrambling */
01060                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
01061                 if (newdata) {
01062                     int offset = 0;
01063                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
01064                     while (offset < asf_st->pkt.size) {
01065                         int off = offset / asf_st->ds_chunk_size;
01066                         int row = off / asf_st->ds_span;
01067                         int col = off % asf_st->ds_span;
01068                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
01069                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
01070 
01071                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
01072                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
01073                         memcpy(newdata + offset,
01074                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
01075                                asf_st->ds_chunk_size);
01076                         offset += asf_st->ds_chunk_size;
01077                     }
01078                     av_free(asf_st->pkt.data);
01079                     asf_st->pkt.data = newdata;
01080                 }
01081               }
01082             }
01083             asf_st->frag_offset = 0;
01084             *pkt= asf_st->pkt;
01085             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
01086             asf_st->pkt.size = 0;
01087             asf_st->pkt.data = 0;
01088             break; // packet completed
01089         }
01090     }
01091     return 0;
01092 }
01093 
01094 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
01095 {
01096     ASFContext *asf = s->priv_data;
01097 
01098     for (;;) {
01099         int ret;
01100 
01101         /* parse cached packets, if any */
01102         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
01103             return ret;
01104         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
01105             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
01106         asf->packet_time_start = 0;
01107     }
01108 
01109     return 0;
01110 }
01111 
01112 // Added to support seeking after packets have been read
01113 // If information is not reset, read_packet fails due to
01114 // leftover information from previous reads
01115 static void asf_reset_header(AVFormatContext *s)
01116 {
01117     ASFContext *asf = s->priv_data;
01118     ASFStream *asf_st;
01119     int i;
01120 
01121     asf->packet_size_left = 0;
01122     asf->packet_segments = 0;
01123     asf->packet_flags = 0;
01124     asf->packet_property = 0;
01125     asf->packet_timestamp = 0;
01126     asf->packet_segsizetype = 0;
01127     asf->packet_segments = 0;
01128     asf->packet_seq = 0;
01129     asf->packet_replic_size = 0;
01130     asf->packet_key_frame = 0;
01131     asf->packet_padsize = 0;
01132     asf->packet_frag_offset = 0;
01133     asf->packet_frag_size = 0;
01134     asf->packet_frag_timestamp = 0;
01135     asf->packet_multi_size = 0;
01136     asf->packet_obj_size = 0;
01137     asf->packet_time_delta = 0;
01138     asf->packet_time_start = 0;
01139 
01140     for(i=0; i<s->nb_streams; i++){
01141         asf_st= s->streams[i]->priv_data;
01142         av_free_packet(&asf_st->pkt);
01143         asf_st->frag_offset=0;
01144         asf_st->seq=0;
01145     }
01146     asf->asf_st= NULL;
01147 }
01148 
01149 static int asf_read_close(AVFormatContext *s)
01150 {
01151     asf_reset_header(s);
01152 
01153     return 0;
01154 }
01155 
01156 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01157 {
01158     AVPacket pkt1, *pkt = &pkt1;
01159     ASFStream *asf_st;
01160     int64_t pts;
01161     int64_t pos= *ppos;
01162     int i;
01163     int64_t start_pos[ASF_MAX_STREAMS];
01164 
01165     for(i=0; i<s->nb_streams; i++){
01166         start_pos[i]= pos;
01167     }
01168 
01169     if (s->packet_size > 0)
01170         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01171     *ppos= pos;
01172     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
01173         return AV_NOPTS_VALUE;
01174 
01175 //printf("asf_read_pts\n");
01176     asf_reset_header(s);
01177     for(;;){
01178         if (av_read_frame(s, pkt) < 0){
01179             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01180             return AV_NOPTS_VALUE;
01181         }
01182 
01183         pts= pkt->pts;
01184 
01185         av_free_packet(pkt);
01186         if(pkt->flags&AV_PKT_FLAG_KEY){
01187             i= pkt->stream_index;
01188 
01189             asf_st= s->streams[i]->priv_data;
01190 
01191 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01192             pos= asf_st->packet_pos;
01193 
01194             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01195             start_pos[i]= asf_st->packet_pos + 1;
01196 
01197             if(pkt->stream_index == stream_index)
01198                break;
01199         }
01200     }
01201 
01202     *ppos= pos;
01203 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01204 
01205     return pts;
01206 }
01207 
01208 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01209 {
01210     ff_asf_guid g;
01211     ASFContext *asf = s->priv_data;
01212     int64_t current_pos= avio_tell(s->pb);
01213     int i;
01214 
01215     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0)
01216         return;
01217 
01218     ff_get_guid(s->pb, &g);
01219 
01220     /* the data object can be followed by other top-level objects,
01221        skip them until the simple index object is reached */
01222     while (ff_guidcmp(&g, &index_guid)) {
01223         int64_t gsize= avio_rl64(s->pb);
01224         if (gsize < 24 || url_feof(s->pb)) {
01225             avio_seek(s->pb, current_pos, SEEK_SET);
01226             return;
01227         }
01228         avio_skip(s->pb, gsize-24);
01229         ff_get_guid(s->pb, &g);
01230     }
01231 
01232     {
01233         int64_t itime, last_pos=-1;
01234         int pct, ict;
01235         int64_t av_unused gsize= avio_rl64(s->pb);
01236         ff_get_guid(s->pb, &g);
01237         itime=avio_rl64(s->pb);
01238         pct=avio_rl32(s->pb);
01239         ict=avio_rl32(s->pb);
01240         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01241 
01242         for (i=0;i<ict;i++){
01243             int pktnum=avio_rl32(s->pb);
01244             int pktct =avio_rl16(s->pb);
01245             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01246             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
01247 
01248             if(pos != last_pos){
01249             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);
01250             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01251             last_pos=pos;
01252             }
01253         }
01254         asf->index_read= 1;
01255     }
01256     avio_seek(s->pb, current_pos, SEEK_SET);
01257 }
01258 
01259 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01260 {
01261     ASFContext *asf = s->priv_data;
01262     AVStream *st = s->streams[stream_index];
01263     int64_t pos;
01264     int index;
01265 
01266     if (s->packet_size <= 0)
01267         return -1;
01268 
01269     /* Try using the protocol's read_seek if available */
01270     if(s->pb) {
01271         int ret = avio_seek_time(s->pb, stream_index, pts, flags);
01272         if(ret >= 0)
01273             asf_reset_header(s);
01274         if (ret != AVERROR(ENOSYS))
01275             return ret;
01276     }
01277 
01278     if (!asf->index_read)
01279         asf_build_simple_index(s, stream_index);
01280 
01281     if((asf->index_read && st->index_entries)){
01282         index= av_index_search_timestamp(st, pts, flags);
01283         if(index >= 0) {
01284             /* find the position */
01285             pos = st->index_entries[index].pos;
01286 
01287             /* do the seek */
01288             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01289             if(avio_seek(s->pb, pos, SEEK_SET) < 0)
01290                 return -1;
01291             asf_reset_header(s);
01292             return 0;
01293         }
01294     }
01295     /* no index or seeking by index failed */
01296     if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
01297         return -1;
01298     asf_reset_header(s);
01299     return 0;
01300 }
01301 
01302 AVInputFormat ff_asf_demuxer = {
01303     "asf",
01304     NULL_IF_CONFIG_SMALL("ASF format"),
01305     sizeof(ASFContext),
01306     asf_probe,
01307     asf_read_header,
01308     asf_read_packet,
01309     asf_read_close,
01310     asf_read_seek,
01311     asf_read_pts,
01312     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
01313 };