FFmpeg: libavformat/asfdec.c Source File

00001 /*
00002  * ASF compatible demuxer
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 //#define DEBUG
00023 
00024 #include "libavutil/bswap.h"
00025 #include "libavutil/common.h"
00026 #include "libavutil/avstring.h"
00027 #include "libavutil/dict.h"
00028 #include "libavutil/mathematics.h"
00029 #include "libavcodec/mpegaudio.h"
00030 #include "avformat.h"
00031 #include "internal.h"
00032 #include "avio_internal.h"
00033 #include "riff.h"
00034 #include "asf.h"
00035 #include "asfcrypt.h"
00036 #include "avlanguage.h"
00037 
00038 typedef struct {
00039     int asfid2avid[128];                 
00040     ASFStream streams[128];              
00041     uint32_t stream_bitrates[128];       
00042     AVRational dar[128];
00043     char stream_languages[128][6];       
00044     /* non streamed additonnal info */
00045     /* packet filling */
00046     int packet_size_left;
00047     /* only for reading */
00048     uint64_t data_offset;                
00049     uint64_t data_object_offset;         
00050     uint64_t data_object_size;           
00051     int index_read;
00052 
00053     ASFMainHeader hdr;
00054 
00055     int packet_flags;
00056     int packet_property;
00057     int packet_timestamp;
00058     int packet_segsizetype;
00059     int packet_segments;
00060     int packet_seq;
00061     int packet_replic_size;
00062     int packet_key_frame;
00063     int packet_padsize;
00064     unsigned int packet_frag_offset;
00065     unsigned int packet_frag_size;
00066     int64_t packet_frag_timestamp;
00067     int packet_multi_size;
00068     int packet_obj_size;
00069     int packet_time_delta;
00070     int packet_time_start;
00071     int64_t packet_pos;
00072 
00073     int stream_index;
00074 
00075     ASFStream* asf_st;                   
00076 } ASFContext;
00077 
00078 #undef NDEBUG
00079 #include <assert.h>
00080 
00081 #define ASF_MAX_STREAMS 127
00082 #define FRAME_HEADER_SIZE 17
00083 // Fix Me! FRAME_HEADER_SIZE may be different.
00084 
00085 static const ff_asf_guid index_guid = {
00086     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
00087 };
00088 
00089 #ifdef DEBUG
00090 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
00091     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
00092 };
00093 
00094 #define PRINT_IF_GUID(g,cmp) \
00095 if (!ff_guidcmp(g, &cmp)) \
00096     av_dlog(NULL, "(GUID: %s) ", #cmp)
00097 
00098 static void print_guid(const ff_asf_guid *g)
00099 {
00100     int i;
00101     PRINT_IF_GUID(g, ff_asf_header);
00102     else PRINT_IF_GUID(g, ff_asf_file_header);
00103     else PRINT_IF_GUID(g, ff_asf_stream_header);
00104     else PRINT_IF_GUID(g, ff_asf_audio_stream);
00105     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
00106     else PRINT_IF_GUID(g, ff_asf_video_stream);
00107     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
00108     else PRINT_IF_GUID(g, ff_asf_command_stream);
00109     else PRINT_IF_GUID(g, ff_asf_comment_header);
00110     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
00111     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
00112     else PRINT_IF_GUID(g, ff_asf_data_header);
00113     else PRINT_IF_GUID(g, index_guid);
00114     else PRINT_IF_GUID(g, ff_asf_head1_guid);
00115     else PRINT_IF_GUID(g, ff_asf_head2_guid);
00116     else PRINT_IF_GUID(g, ff_asf_my_guid);
00117     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
00118     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
00119     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
00120     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
00121     else PRINT_IF_GUID(g, ff_asf_metadata_header);
00122     else PRINT_IF_GUID(g, ff_asf_marker_header);
00123     else PRINT_IF_GUID(g, stream_bitrate_guid);
00124     else PRINT_IF_GUID(g, ff_asf_language_guid);
00125     else
00126         av_dlog(NULL, "(GUID: unknown) ");
00127     for(i=0;i<16;i++)
00128         av_dlog(NULL, " 0x%02x,", (*g)[i]);
00129     av_dlog(NULL, "}\n");
00130 }
00131 #undef PRINT_IF_GUID
00132 #else
00133 #define print_guid(g)
00134 #endif
00135 
00136 static int asf_probe(AVProbeData *pd)
00137 {
00138     /* check file header */
00139     if (!ff_guidcmp(pd->buf, &ff_asf_header))
00140         return AVPROBE_SCORE_MAX;
00141     else
00142         return 0;
00143 }
00144 
00145 static int get_value(AVIOContext *pb, int type){
00146     switch(type){
00147         case 2: return avio_rl32(pb);
00148         case 3: return avio_rl32(pb);
00149         case 4: return avio_rl64(pb);
00150         case 5: return avio_rl16(pb);
00151         default:return INT_MIN;
00152     }
00153 }
00154 
00155 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
00156 {
00157     char *value;
00158     int64_t off = avio_tell(s->pb);
00159 
00160     if ((unsigned)len >= (UINT_MAX - 1)/2)
00161         return;
00162 
00163     value = av_malloc(2*len+1);
00164     if (!value)
00165         goto finish;
00166 
00167     if (type == 0) {         // UTF16-LE
00168         avio_get_str16le(s->pb, len, value, 2*len + 1);
00169     } else if (type == -1) { // ASCII
00170         avio_read(s->pb, value, len);
00171         value[len]=0;
00172     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
00173         uint64_t num = get_value(s->pb, type);
00174         snprintf(value, len, "%"PRIu64, num);
00175     } else {
00176         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
00177         goto finish;
00178     }
00179     if (*value)
00180         av_dict_set(&s->metadata, key, value, 0);
00181 finish:
00182     av_freep(&value);
00183     avio_seek(s->pb, off + len, SEEK_SET);
00184 }
00185 
00186 static int asf_read_file_properties(AVFormatContext *s, int64_t size)
00187 {
00188     ASFContext *asf = s->priv_data;
00189     AVIOContext *pb = s->pb;
00190 
00191     ff_get_guid(pb, &asf->hdr.guid);
00192     asf->hdr.file_size          = avio_rl64(pb);
00193     asf->hdr.create_time        = avio_rl64(pb);
00194     avio_rl64(pb);                               /* number of packets */
00195     asf->hdr.play_time          = avio_rl64(pb);
00196     asf->hdr.send_time          = avio_rl64(pb);
00197     asf->hdr.preroll            = avio_rl32(pb);
00198     asf->hdr.ignore             = avio_rl32(pb);
00199     asf->hdr.flags              = avio_rl32(pb);
00200     asf->hdr.min_pktsize        = avio_rl32(pb);
00201     asf->hdr.max_pktsize        = avio_rl32(pb);
00202     if (asf->hdr.min_pktsize >= (1U<<29))
00203         return AVERROR_INVALIDDATA;
00204     asf->hdr.max_bitrate        = avio_rl32(pb);
00205     s->packet_size = asf->hdr.max_pktsize;
00206 
00207     return 0;
00208 }
00209 
00210 static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
00211 {
00212     ASFContext *asf = s->priv_data;
00213     AVIOContext *pb = s->pb;
00214     AVStream *st;
00215     ASFStream *asf_st;
00216     ff_asf_guid g;
00217     enum AVMediaType type;
00218     int type_specific_size, sizeX;
00219     unsigned int tag1;
00220     int64_t pos1, pos2, start_time;
00221     int test_for_ext_stream_audio, is_dvr_ms_audio=0;
00222 
00223     if (s->nb_streams == ASF_MAX_STREAMS) {
00224         av_log(s, AV_LOG_ERROR, "too many streams\n");
00225         return AVERROR(EINVAL);
00226     }
00227 
00228     pos1 = avio_tell(pb);
00229 
00230     st = avformat_new_stream(s, NULL);
00231     if (!st)
00232         return AVERROR(ENOMEM);
00233     avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00234     asf_st = av_mallocz(sizeof(ASFStream));
00235     if (!asf_st)
00236         return AVERROR(ENOMEM);
00237     st->priv_data = asf_st;
00238     start_time = asf->hdr.preroll;
00239 
00240     asf_st->stream_language_index = 128; // invalid stream index means no language info
00241 
00242     if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00243         st->duration = asf->hdr.play_time /
00244             (10000000 / 1000) - start_time;
00245     }
00246     ff_get_guid(pb, &g);
00247 
00248     test_for_ext_stream_audio = 0;
00249     if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
00250         type = AVMEDIA_TYPE_AUDIO;
00251     } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
00252         type = AVMEDIA_TYPE_VIDEO;
00253     } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
00254         type = AVMEDIA_TYPE_VIDEO;
00255         st->codec->codec_id = CODEC_ID_MJPEG;
00256     } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
00257         type = AVMEDIA_TYPE_DATA;
00258     } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
00259         test_for_ext_stream_audio = 1;
00260         type = AVMEDIA_TYPE_UNKNOWN;
00261     } else {
00262         return -1;
00263     }
00264     ff_get_guid(pb, &g);
00265     avio_skip(pb, 8); /* total_size */
00266     type_specific_size = avio_rl32(pb);
00267     avio_rl32(pb);
00268     st->id = avio_rl16(pb) & 0x7f; /* stream id */
00269     // mapping of asf ID to AV stream ID;
00270     asf->asfid2avid[st->id] = s->nb_streams - 1;
00271 
00272     avio_rl32(pb);
00273 
00274     if (test_for_ext_stream_audio) {
00275         ff_get_guid(pb, &g);
00276         if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
00277             type = AVMEDIA_TYPE_AUDIO;
00278             is_dvr_ms_audio=1;
00279             ff_get_guid(pb, &g);
00280             avio_rl32(pb);
00281             avio_rl32(pb);
00282             avio_rl32(pb);
00283             ff_get_guid(pb, &g);
00284             avio_rl32(pb);
00285         }
00286     }
00287 
00288     st->codec->codec_type = type;
00289     if (type == AVMEDIA_TYPE_AUDIO) {
00290         int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
00291         if (ret < 0)
00292             return ret;
00293         if (is_dvr_ms_audio) {
00294             // codec_id and codec_tag are unreliable in dvr_ms
00295             // files. Set them later by probing stream.
00296             st->request_probe= 1;
00297             st->codec->codec_tag = 0;
00298         }
00299         if (st->codec->codec_id == CODEC_ID_AAC) {
00300             st->need_parsing = AVSTREAM_PARSE_NONE;
00301         } else {
00302             st->need_parsing = AVSTREAM_PARSE_FULL;
00303         }
00304         /* We have to init the frame size at some point .... */
00305         pos2 = avio_tell(pb);
00306         if (size >= (pos2 + 8 - pos1 + 24)) {
00307             asf_st->ds_span = avio_r8(pb);
00308             asf_st->ds_packet_size = avio_rl16(pb);
00309             asf_st->ds_chunk_size = avio_rl16(pb);
00310             avio_rl16(pb); //ds_data_size
00311             avio_r8(pb);   //ds_silence_data
00312         }
00313         //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
00314         //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
00315         //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
00316         if (asf_st->ds_span > 1) {
00317             if (!asf_st->ds_chunk_size
00318                     || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00319                     || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00320                 asf_st->ds_span = 0; // disable descrambling
00321         }
00322         switch (st->codec->codec_id) {
00323             case CODEC_ID_MP3:
00324                 st->codec->frame_size = MPA_FRAME_SIZE;
00325                 break;
00326             case CODEC_ID_PCM_S16LE:
00327             case CODEC_ID_PCM_S16BE:
00328             case CODEC_ID_PCM_U16LE:
00329             case CODEC_ID_PCM_U16BE:
00330             case CODEC_ID_PCM_S8:
00331             case CODEC_ID_PCM_U8:
00332             case CODEC_ID_PCM_ALAW:
00333             case CODEC_ID_PCM_MULAW:
00334                 st->codec->frame_size = 1;
00335                 break;
00336             default:
00337                 /* This is probably wrong, but it prevents a crash later */
00338                 st->codec->frame_size = 1;
00339                 break;
00340         }
00341     } else if (type == AVMEDIA_TYPE_VIDEO &&
00342             size - (avio_tell(pb) - pos1 + 24) >= 51) {
00343         avio_rl32(pb);
00344         avio_rl32(pb);
00345         avio_r8(pb);
00346         avio_rl16(pb);        /* size */
00347         sizeX= avio_rl32(pb); /* size */
00348         st->codec->width = avio_rl32(pb);
00349         st->codec->height = avio_rl32(pb);
00350         /* not available for asf */
00351         avio_rl16(pb); /* panes */
00352         st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
00353         tag1 = avio_rl32(pb);
00354         avio_skip(pb, 20);
00355         //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
00356         if (sizeX > 40) {
00357             st->codec->extradata_size = sizeX - 40;
00358             st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00359             avio_read(pb, st->codec->extradata, st->codec->extradata_size);
00360         }
00361 
00362         /* Extract palette from extradata if bpp <= 8 */
00363         /* This code assumes that extradata contains only palette */
00364         /* This is true for all paletted codecs implemented in libavcodec */
00365         if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00366             int av_unused i;
00367 #if HAVE_BIGENDIAN
00368             for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00369                 asf_st->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
00370 #else
00371             memcpy(asf_st->palette, st->codec->extradata,
00372                    FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00373 #endif
00374             asf_st->palette_changed = 1;
00375         }
00376 
00377         st->codec->codec_tag = tag1;
00378         st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00379         if(tag1 == MKTAG('D', 'V', 'R', ' ')){
00380             st->need_parsing = AVSTREAM_PARSE_FULL;
00381             // 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
00382             st->codec->width  =
00383                 st->codec->height = 0;
00384             av_freep(&st->codec->extradata);
00385             st->codec->extradata_size=0;
00386         }
00387         if(st->codec->codec_id == CODEC_ID_H264)
00388             st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
00389     }
00390     pos2 = avio_tell(pb);
00391     avio_skip(pb, size - (pos2 - pos1 + 24));
00392 
00393     return 0;
00394 }
00395 
00396 static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
00397 {
00398     ASFContext *asf = s->priv_data;
00399     AVIOContext *pb = s->pb;
00400     ff_asf_guid g;
00401     int ext_len, payload_ext_ct, stream_ct, i;
00402     uint32_t leak_rate, stream_num;
00403     unsigned int stream_languageid_index;
00404 
00405     avio_rl64(pb); // starttime
00406     avio_rl64(pb); // endtime
00407     leak_rate = avio_rl32(pb); // leak-datarate
00408     avio_rl32(pb); // bucket-datasize
00409     avio_rl32(pb); // init-bucket-fullness
00410     avio_rl32(pb); // alt-leak-datarate
00411     avio_rl32(pb); // alt-bucket-datasize
00412     avio_rl32(pb); // alt-init-bucket-fullness
00413     avio_rl32(pb); // max-object-size
00414     avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00415     stream_num = avio_rl16(pb); // stream-num
00416 
00417     stream_languageid_index = avio_rl16(pb); // stream-language-id-index
00418     if (stream_num < 128)
00419         asf->streams[stream_num].stream_language_index = stream_languageid_index;
00420 
00421     avio_rl64(pb); // avg frametime in 100ns units
00422     stream_ct = avio_rl16(pb); //stream-name-count
00423     payload_ext_ct = avio_rl16(pb); //payload-extension-system-count
00424 
00425     if (stream_num < 128)
00426         asf->stream_bitrates[stream_num] = leak_rate;
00427 
00428     for (i=0; i<stream_ct; i++){
00429         avio_rl16(pb);
00430         ext_len = avio_rl16(pb);
00431         avio_skip(pb, ext_len);
00432     }
00433 
00434     for (i=0; i<payload_ext_ct; i++){
00435         ff_get_guid(pb, &g);
00436         avio_skip(pb, 2);
00437         ext_len=avio_rl32(pb);
00438         avio_skip(pb, ext_len);
00439     }
00440 
00441     return 0;
00442 }
00443 
00444 static int asf_read_content_desc(AVFormatContext *s, int64_t size)
00445 {
00446     AVIOContext *pb = s->pb;
00447     int len1, len2, len3, len4, len5;
00448 
00449     len1 = avio_rl16(pb);
00450     len2 = avio_rl16(pb);
00451     len3 = avio_rl16(pb);
00452     len4 = avio_rl16(pb);
00453     len5 = avio_rl16(pb);
00454     get_tag(s, "title"    , 0, len1);
00455     get_tag(s, "author"   , 0, len2);
00456     get_tag(s, "copyright", 0, len3);
00457     get_tag(s, "comment"  , 0, len4);
00458     avio_skip(pb, len5);
00459 
00460     return 0;
00461 }
00462 
00463 static int asf_read_ext_content_desc(AVFormatContext *s, int64_t size)
00464 {
00465     AVIOContext *pb = s->pb;
00466     ASFContext *asf = s->priv_data;
00467     int desc_count, i, ret;
00468 
00469     desc_count = avio_rl16(pb);
00470     for(i=0;i<desc_count;i++) {
00471         int name_len,value_type,value_len;
00472         char name[1024];
00473 
00474         name_len = avio_rl16(pb);
00475         if (name_len%2)     // must be even, broken lavf versions wrote len-1
00476             name_len += 1;
00477         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00478             avio_skip(pb, name_len - ret);
00479         value_type = avio_rl16(pb);
00480         value_len  = avio_rl16(pb);
00481         if (!value_type && value_len%2)
00482             value_len += 1;
00487         if (!strcmp(name, "AspectRatioX")){
00488             asf->dar[0].num= get_value(s->pb, value_type);
00489         } else if(!strcmp(name, "AspectRatioY")){
00490             asf->dar[0].den= get_value(s->pb, value_type);
00491         } else
00492             get_tag(s, name, value_type, value_len);
00493     }
00494 
00495     return 0;
00496 }
00497 
00498 static int asf_read_language_list(AVFormatContext *s, int64_t size)
00499 {
00500     AVIOContext *pb = s->pb;
00501     ASFContext *asf = s->priv_data;
00502     int j, ret;
00503     int stream_count = avio_rl16(pb);
00504     for(j = 0; j < stream_count; j++) {
00505         char lang[6];
00506         unsigned int lang_len = avio_r8(pb);
00507         if ((ret = avio_get_str16le(pb, lang_len, lang, sizeof(lang))) < lang_len)
00508             avio_skip(pb, lang_len - ret);
00509         if (j < 128)
00510             av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
00511     }
00512 
00513     return 0;
00514 }
00515 
00516 static int asf_read_metadata(AVFormatContext *s, int64_t size)
00517 {
00518     AVIOContext *pb = s->pb;
00519     ASFContext *asf = s->priv_data;
00520     int n, stream_num, name_len, value_len, value_num;
00521     int ret, i;
00522     n = avio_rl16(pb);
00523 
00524     for(i=0;i<n;i++) {
00525         char name[1024];
00526 
00527         avio_rl16(pb); //lang_list_index
00528         stream_num= avio_rl16(pb);
00529         name_len=   avio_rl16(pb);
00530         avio_skip(pb, 2); /* value_type */
00531         value_len=  avio_rl32(pb);
00532 
00533         if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
00534             avio_skip(pb, name_len - ret);
00535         //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
00536         value_num= avio_rl16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00537         avio_skip(pb, value_len - 2);
00538 
00539         if(stream_num<128){
00540             if     (!strcmp(name, "AspectRatioX")) asf->dar[stream_num].num= value_num;
00541             else if(!strcmp(name, "AspectRatioY")) asf->dar[stream_num].den= value_num;
00542         }
00543     }
00544 
00545     return 0;
00546 }
00547 
00548 static int asf_read_marker(AVFormatContext *s, int64_t size)
00549 {
00550     AVIOContext *pb = s->pb;
00551     int i, count, name_len, ret;
00552     char name[1024];
00553 
00554     avio_rl64(pb);            // reserved 16 bytes
00555     avio_rl64(pb);            // ...
00556     count = avio_rl32(pb);    // markers count
00557     avio_rl16(pb);            // reserved 2 bytes
00558     name_len = avio_rl16(pb); // name length
00559     for(i=0;i<name_len;i++){
00560         avio_r8(pb); // skip the name
00561     }
00562 
00563     for(i=0;i<count;i++){
00564         int64_t pres_time;
00565         int name_len;
00566 
00567         avio_rl64(pb);             // offset, 8 bytes
00568         pres_time = avio_rl64(pb); // presentation time
00569         avio_rl16(pb);             // entry length
00570         avio_rl32(pb);             // send time
00571         avio_rl32(pb);             // flags
00572         name_len = avio_rl32(pb);  // name length
00573         if ((ret = avio_get_str16le(pb, name_len * 2, name, sizeof(name))) < name_len)
00574             avio_skip(pb, name_len - ret);
00575         avpriv_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
00576     }
00577 
00578     return 0;
00579 }
00580 
00581 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
00582 {
00583     ASFContext *asf = s->priv_data;
00584     ff_asf_guid g;
00585     AVIOContext *pb = s->pb;
00586     int i;
00587     int64_t gsize;
00588 
00589     ff_get_guid(pb, &g);
00590     if (ff_guidcmp(&g, &ff_asf_header))
00591         return -1;
00592     avio_rl64(pb);
00593     avio_rl32(pb);
00594     avio_r8(pb);
00595     avio_r8(pb);
00596     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00597     for(;;) {
00598         uint64_t gpos= avio_tell(pb);
00599         ff_get_guid(pb, &g);
00600         gsize = avio_rl64(pb);
00601         av_dlog(s, "%08"PRIx64": ", gpos);
00602         print_guid(&g);
00603         av_dlog(s, "  size=0x%"PRIx64"\n", gsize);
00604         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
00605             asf->data_object_offset = avio_tell(pb);
00606             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00607             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00608                 asf->data_object_size = gsize - 24;
00609             } else {
00610                 asf->data_object_size = (uint64_t)-1;
00611             }
00612             break;
00613         }
00614         if (gsize < 24)
00615             return -1;
00616         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
00617             int ret = asf_read_file_properties(s, gsize);
00618             if (ret < 0)
00619                 return ret;
00620         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
00621             asf_read_stream_properties(s, gsize);
00622         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00623             asf_read_content_desc(s, gsize);
00624         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00625             asf_read_language_list(s, gsize);
00626         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00627             asf_read_ext_content_desc(s, gsize);
00628         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00629             asf_read_metadata(s, gsize);
00630         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00631             asf_read_ext_stream_properties(s, gsize);
00632 
00633             // there could be a optional stream properties object to follow
00634             // if so the next iteration will pick it up
00635             continue;
00636         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00637             ff_get_guid(pb, &g);
00638             avio_skip(pb, 6);
00639             continue;
00640         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00641             asf_read_marker(s, gsize);
00642         } else if (url_feof(pb)) {
00643             return -1;
00644         } else {
00645             if (!s->keylen) {
00646                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00647                     unsigned int len;
00648                     AVPacket pkt;
00649                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00650                     len= avio_rl32(pb);
00651                     av_log(s, AV_LOG_DEBUG, "Secret data:\n");
00652                     av_get_packet(pb, &pkt, len); av_hex_dump_log(s, AV_LOG_DEBUG, pkt.data, pkt.size); av_free_packet(&pkt);
00653                     len= avio_rl32(pb);
00654                     get_tag(s, "ASF_Protection_Type", -1, len);
00655                     len= avio_rl32(pb);
00656                     get_tag(s, "ASF_Key_ID", -1, len);
00657                     len= avio_rl32(pb);
00658                     get_tag(s, "ASF_License_URL", -1, len);
00659                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00660                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00661                     av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
00662                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00663                     av_log(s, AV_LOG_INFO, "Digital signature detected!\n");
00664                 }
00665             }
00666         }
00667         if(avio_tell(pb) != gpos + gsize)
00668             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", avio_tell(pb)-gpos, gsize);
00669         avio_seek(pb, gpos + gsize, SEEK_SET);
00670     }
00671     ff_get_guid(pb, &g);
00672     avio_rl64(pb);
00673     avio_r8(pb);
00674     avio_r8(pb);
00675     if (url_feof(pb))
00676         return -1;
00677     asf->data_offset = avio_tell(pb);
00678     asf->packet_size_left = 0;
00679 
00680 
00681     for(i=0; i<128; i++){
00682         int stream_num= asf->asfid2avid[i];
00683         if(stream_num>=0){
00684             AVStream *st = s->streams[stream_num];
00685             if (!st->codec->bit_rate)
00686                 st->codec->bit_rate = asf->stream_bitrates[i];
00687             if (asf->dar[i].num > 0 && asf->dar[i].den > 0){
00688                 av_reduce(&st->sample_aspect_ratio.num,
00689                           &st->sample_aspect_ratio.den,
00690                           asf->dar[i].num, asf->dar[i].den, INT_MAX);
00691             } 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.
00692                 av_reduce(&st->sample_aspect_ratio.num,
00693                           &st->sample_aspect_ratio.den,
00694                           asf->dar[0].num, asf->dar[0].den, INT_MAX);
00695 
00696 //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);
00697 
00698             // copy and convert language codes to the frontend
00699             if (asf->streams[i].stream_language_index < 128) {
00700                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00701                 if (rfc1766 && strlen(rfc1766) > 1) {
00702                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00703                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00704                     if (iso6392)
00705                         av_dict_set(&st->metadata, "language", iso6392, 0);
00706                 }
00707             }
00708         }
00709     }
00710 
00711     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00712 
00713     return 0;
00714 }
00715 
00716 #define DO_2BITS(bits, var, defval) \
00717     switch (bits & 3) \
00718     { \
00719     case 3: var = avio_rl32(pb); rsize += 4; break; \
00720     case 2: var = avio_rl16(pb); rsize += 2; break; \
00721     case 1: var = avio_r8(pb);   rsize++; break; \
00722     default: var = defval; break; \
00723     }
00724 
00731 static int ff_asf_get_packet(AVFormatContext *s, AVIOContext *pb)
00732 {
00733     ASFContext *asf = s->priv_data;
00734     uint32_t packet_length, padsize;
00735     int rsize = 8;
00736     int c, d, e, off;
00737 
00738     // if we do not know packet size, allow skipping up to 32 kB
00739     off= 32768;
00740     if (s->packet_size > 0)
00741         off= (avio_tell(pb) - s->data_offset) % s->packet_size + 3;
00742 
00743     c=d=e=-1;
00744     while(off-- > 0){
00745         c=d; d=e;
00746         e= avio_r8(pb);
00747         if(c == 0x82 && !d && !e)
00748             break;
00749     }
00750 
00751     if (c != 0x82) {
00758         if (pb->error == AVERROR(EAGAIN))
00759             return AVERROR(EAGAIN);
00760         if (!url_feof(pb))
00761             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, avio_tell(pb));
00762     }
00763     if ((c & 0x8f) == 0x82) {
00764         if (d || e) {
00765             if (!url_feof(pb))
00766                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00767             return -1;
00768         }
00769         c= avio_r8(pb);
00770         d= avio_r8(pb);
00771         rsize+=3;
00772     }else if(!url_feof(pb)){
00773         avio_seek(pb, -1, SEEK_CUR); //FIXME
00774     }
00775 
00776     asf->packet_flags    = c;
00777     asf->packet_property = d;
00778 
00779     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00780     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00781     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00782 
00783     //the following checks prevent overflows and infinite loops
00784     if(!packet_length || packet_length >= (1U<<29)){
00785         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, avio_tell(pb));
00786         return -1;
00787     }
00788     if(padsize >= packet_length){
00789         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, avio_tell(pb));
00790         return -1;
00791     }
00792 
00793     asf->packet_timestamp = avio_rl32(pb);
00794     avio_rl16(pb); /* duration */
00795     // rsize has at least 11 bytes which have to be present
00796 
00797     if (asf->packet_flags & 0x01) {
00798         asf->packet_segsizetype = avio_r8(pb); rsize++;
00799         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00800     } else {
00801         asf->packet_segments = 1;
00802         asf->packet_segsizetype = 0x80;
00803     }
00804     if (rsize > packet_length - padsize) {
00805         asf->packet_size_left = 0;
00806         av_log(s, AV_LOG_ERROR,
00807                "invalid packet header length %d for pktlen %d-%d at %"PRId64"\n",
00808                rsize, packet_length, padsize, avio_tell(pb));
00809         return -1;
00810     }
00811     asf->packet_size_left = packet_length - padsize - rsize;
00812     if (packet_length < asf->hdr.min_pktsize)
00813         padsize += asf->hdr.min_pktsize - packet_length;
00814     asf->packet_padsize = padsize;
00815     av_dlog(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00816     return 0;
00817 }
00818 
00823 static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb){
00824     ASFContext *asf = s->priv_data;
00825     int rsize = 1;
00826     int num = avio_r8(pb);
00827     int64_t ts0, ts1 av_unused;
00828 
00829     asf->packet_segments--;
00830     asf->packet_key_frame = num >> 7;
00831     asf->stream_index = asf->asfid2avid[num & 0x7f];
00832     // sequence should be ignored!
00833     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00834     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00835     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00836 //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);
00837     if (rsize+asf->packet_replic_size > asf->packet_size_left) {
00838         av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);
00839         return -1;
00840     }
00841     if (asf->packet_replic_size >= 8) {
00842         asf->packet_obj_size = avio_rl32(pb);
00843         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00844             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00845             return -1;
00846         }
00847         asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
00848         if(asf->packet_replic_size >= 8+38+4){
00849 //            for(i=0; i<asf->packet_replic_size-8; i++)
00850 //                av_log(s, AV_LOG_DEBUG, "%02X ",avio_r8(pb));
00851 //            av_log(s, AV_LOG_DEBUG, "\n");
00852             avio_skip(pb, 10);
00853             ts0= avio_rl64(pb);
00854             ts1= avio_rl64(pb);
00855             avio_skip(pb, 12);
00856             avio_rl32(pb);
00857             avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
00858             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00859             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00860         }else
00861             avio_skip(pb, asf->packet_replic_size - 8);
00862         rsize += asf->packet_replic_size; // FIXME - check validity
00863     } else if (asf->packet_replic_size==1){
00864         // multipacket - frag_offset is beginning timestamp
00865         asf->packet_time_start = asf->packet_frag_offset;
00866         asf->packet_frag_offset = 0;
00867         asf->packet_frag_timestamp = asf->packet_timestamp;
00868 
00869         asf->packet_time_delta = avio_r8(pb);
00870         rsize++;
00871     }else if(asf->packet_replic_size!=0){
00872         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00873         return -1;
00874     }
00875     if (asf->packet_flags & 0x01) {
00876         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00877         if (rsize > asf->packet_size_left) {
00878             av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
00879             return -1;
00880         } else if(asf->packet_frag_size > asf->packet_size_left - rsize){
00881             if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
00882                 av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n", asf->packet_size_left, rsize);
00883                 return -1;
00884             } else {
00885                 int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
00886                 asf->packet_size_left += diff;
00887                 asf->packet_padsize   -= diff;
00888             }
00889         }
00890         //printf("Fragsize %d\n", asf->packet_frag_size);
00891     } else {
00892         asf->packet_frag_size = asf->packet_size_left - rsize;
00893         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00894     }
00895     if (asf->packet_replic_size == 1) {
00896         asf->packet_multi_size = asf->packet_frag_size;
00897         if (asf->packet_multi_size > asf->packet_size_left)
00898             return -1;
00899     }
00900     asf->packet_size_left -= rsize;
00901     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00902 
00903     return 0;
00904 }
00905 
00915 static int ff_asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
00916 {
00917     ASFContext *asf = s->priv_data;
00918     ASFStream *asf_st = 0;
00919     for (;;) {
00920         int ret;
00921         if(url_feof(pb))
00922             return AVERROR_EOF;
00923         if (asf->packet_size_left < FRAME_HEADER_SIZE
00924             || asf->packet_segments < 1) {
00925             //asf->packet_size_left <= asf->packet_padsize) {
00926             int ret = asf->packet_size_left + asf->packet_padsize;
00927             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, avio_tell(pb));
00928             assert(ret>=0);
00929             /* fail safe */
00930             avio_skip(pb, ret);
00931 
00932             asf->packet_pos= avio_tell(pb);
00933             if (asf->data_object_size != (uint64_t)-1 &&
00934                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00935                 return AVERROR_EOF; /* Do not exceed the size of the data object */
00936             return 1;
00937         }
00938         if (asf->packet_time_start == 0) {
00939             if(asf_read_frame_header(s, pb) < 0){
00940                 asf->packet_segments= 0;
00941                 continue;
00942             }
00943             if (asf->stream_index < 0
00944                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00945                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00946                 ) {
00947                 asf->packet_time_start = 0;
00948                 /* unhandled packet (should not happen) */
00949                 avio_skip(pb, asf->packet_frag_size);
00950                 asf->packet_size_left -= asf->packet_frag_size;
00951                 if(asf->stream_index < 0)
00952                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00953                 continue;
00954             }
00955             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00956         }
00957         asf_st = asf->asf_st;
00958 
00959         if (asf->packet_replic_size == 1) {
00960             // frag_offset is here used as the beginning timestamp
00961             asf->packet_frag_timestamp = asf->packet_time_start;
00962             asf->packet_time_start += asf->packet_time_delta;
00963             asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
00964             asf->packet_size_left--;
00965             asf->packet_multi_size--;
00966             if (asf->packet_multi_size < asf->packet_obj_size)
00967             {
00968                 asf->packet_time_start = 0;
00969                 avio_skip(pb, asf->packet_multi_size);
00970                 asf->packet_size_left -= asf->packet_multi_size;
00971                 continue;
00972             }
00973             asf->packet_multi_size -= asf->packet_obj_size;
00974             //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);
00975         }
00976         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00977               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00978            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00979             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00980                 asf_st->frag_offset, asf->packet_frag_size,
00981                 asf->packet_obj_size, asf_st->pkt.size);
00982             asf->packet_obj_size= asf_st->pkt.size;
00983         }
00984 
00985         if (   asf_st->pkt.size != asf->packet_obj_size
00986             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00987             if(asf_st->pkt.data){
00988                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00989                 asf_st->frag_offset = 0;
00990                 av_free_packet(&asf_st->pkt);
00991             }
00992             /* new packet */
00993             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00994             asf_st->seq = asf->packet_seq;
00995             asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
00996             asf_st->pkt.stream_index = asf->stream_index;
00997             asf_st->pkt.pos =
00998             asf_st->packet_pos= asf->packet_pos;
00999             if (asf_st->pkt.data && asf_st->palette_changed) {
01000                 uint8_t *pal;
01001                 pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
01002                                               AVPALETTE_SIZE);
01003                 if (!pal) {
01004                     av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
01005                 } else {
01006                     memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
01007                     asf_st->palette_changed = 0;
01008                 }
01009             }
01010 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
01011 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
01012 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
01013             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
01014                 asf->packet_key_frame = 1;
01015             if (asf->packet_key_frame)
01016                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
01017         }
01018 
01019         /* read data */
01020         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
01021         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
01022         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
01023         asf->packet_size_left -= asf->packet_frag_size;
01024         if (asf->packet_size_left < 0)
01025             continue;
01026 
01027         if(   asf->packet_frag_offset >= asf_st->pkt.size
01028            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
01029             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
01030                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
01031             continue;
01032         }
01033 
01034         ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
01035                          asf->packet_frag_size);
01036         if (ret != asf->packet_frag_size) {
01037             if (ret < 0 || asf->packet_frag_offset + ret == 0)
01038                 return ret < 0 ? ret : AVERROR_EOF;
01039             if (asf_st->ds_span > 1) {
01040                 // scrambling, we can either drop it completely or fill the remainder
01041                 // TODO: should we fill the whole packet instead of just the current
01042                 // fragment?
01043                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
01044                        asf->packet_frag_size - ret);
01045                 ret = asf->packet_frag_size;
01046             } else
01047                 // no scrambling, so we can return partial packets
01048                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
01049         }
01050         if (s->key && s->keylen == 20)
01051             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
01052                             ret);
01053         asf_st->frag_offset += ret;
01054         /* test if whole packet is read */
01055         if (asf_st->frag_offset == asf_st->pkt.size) {
01056             //workaround for macroshit radio DVR-MS files
01057             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
01058                && asf_st->pkt.size > 100){
01059                 int i;
01060                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
01061                 if(i == asf_st->pkt.size){
01062                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
01063                     asf_st->frag_offset = 0;
01064                     av_free_packet(&asf_st->pkt);
01065                     continue;
01066                 }
01067             }
01068 
01069             /* return packet */
01070             if (asf_st->ds_span > 1) {
01071               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
01072                     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);
01073               }else{
01074                 /* packet descrambling */
01075                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
01076                 if (newdata) {
01077                     int offset = 0;
01078                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
01079                     while (offset < asf_st->pkt.size) {
01080                         int off = offset / asf_st->ds_chunk_size;
01081                         int row = off / asf_st->ds_span;
01082                         int col = off % asf_st->ds_span;
01083                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
01084                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
01085 
01086                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
01087                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
01088                         memcpy(newdata + offset,
01089                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
01090                                asf_st->ds_chunk_size);
01091                         offset += asf_st->ds_chunk_size;
01092                     }
01093                     av_free(asf_st->pkt.data);
01094                     asf_st->pkt.data = newdata;
01095                 }
01096               }
01097             }
01098             asf_st->frag_offset = 0;
01099             *pkt= asf_st->pkt;
01100             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
01101             asf_st->pkt.size = 0;
01102             asf_st->pkt.data = 0;
01103             asf_st->pkt.side_data_elems = 0;
01104             asf_st->pkt.side_data = NULL;
01105             break; // packet completed
01106         }
01107     }
01108     return 0;
01109 }
01110 
01111 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
01112 {
01113     ASFContext *asf = s->priv_data;
01114 
01115     for (;;) {
01116         int ret;
01117 
01118         /* parse cached packets, if any */
01119         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
01120             return ret;
01121         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
01122             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
01123         asf->packet_time_start = 0;
01124     }
01125 }
01126 
01127 // Added to support seeking after packets have been read
01128 // If information is not reset, read_packet fails due to
01129 // leftover information from previous reads
01130 static void asf_reset_header(AVFormatContext *s)
01131 {
01132     ASFContext *asf = s->priv_data;
01133     ASFStream *asf_st;
01134     int i;
01135 
01136     asf->packet_size_left = 0;
01137     asf->packet_segments = 0;
01138     asf->packet_flags = 0;
01139     asf->packet_property = 0;
01140     asf->packet_timestamp = 0;
01141     asf->packet_segsizetype = 0;
01142     asf->packet_segments = 0;
01143     asf->packet_seq = 0;
01144     asf->packet_replic_size = 0;
01145     asf->packet_key_frame = 0;
01146     asf->packet_padsize = 0;
01147     asf->packet_frag_offset = 0;
01148     asf->packet_frag_size = 0;
01149     asf->packet_frag_timestamp = 0;
01150     asf->packet_multi_size = 0;
01151     asf->packet_obj_size = 0;
01152     asf->packet_time_delta = 0;
01153     asf->packet_time_start = 0;
01154 
01155     for(i=0; i<s->nb_streams; i++){
01156         asf_st= s->streams[i]->priv_data;
01157         av_free_packet(&asf_st->pkt);
01158         asf_st->frag_offset=0;
01159         asf_st->seq=0;
01160     }
01161     asf->asf_st= NULL;
01162 }
01163 
01164 static int asf_read_close(AVFormatContext *s)
01165 {
01166     asf_reset_header(s);
01167 
01168     return 0;
01169 }
01170 
01171 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01172 {
01173     AVPacket pkt1, *pkt = &pkt1;
01174     ASFStream *asf_st;
01175     int64_t pts;
01176     int64_t pos= *ppos;
01177     int i;
01178     int64_t start_pos[ASF_MAX_STREAMS];
01179 
01180     for(i=0; i<s->nb_streams; i++){
01181         start_pos[i]= pos;
01182     }
01183 
01184     if (s->packet_size > 0)
01185         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01186     *ppos= pos;
01187     if (avio_seek(s->pb, pos, SEEK_SET) < 0)
01188         return AV_NOPTS_VALUE;
01189 
01190 //printf("asf_read_pts\n");
01191     asf_reset_header(s);
01192     for(;;){
01193         if (av_read_frame(s, pkt) < 0){
01194             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01195             return AV_NOPTS_VALUE;
01196         }
01197 
01198         pts = pkt->dts;
01199 
01200         av_free_packet(pkt);
01201         if(pkt->flags&AV_PKT_FLAG_KEY){
01202             i= pkt->stream_index;
01203 
01204             asf_st= s->streams[i]->priv_data;
01205 
01206 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01207             pos= asf_st->packet_pos;
01208 
01209             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01210             start_pos[i]= asf_st->packet_pos + 1;
01211 
01212             if(pkt->stream_index == stream_index)
01213                break;
01214         }
01215     }
01216 
01217     *ppos= pos;
01218 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01219 
01220     return pts;
01221 }
01222 
01223 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01224 {
01225     ff_asf_guid g;
01226     ASFContext *asf = s->priv_data;
01227     int64_t current_pos= avio_tell(s->pb);
01228 
01229     if(avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET) < 0) {
01230         asf->index_read= -1;
01231         return;
01232     }
01233 
01234     ff_get_guid(s->pb, &g);
01235 
01236     /* the data object can be followed by other top-level objects,
01237        skip them until the simple index object is reached */
01238     while (ff_guidcmp(&g, &index_guid)) {
01239         int64_t gsize= avio_rl64(s->pb);
01240         if (gsize < 24 || url_feof(s->pb)) {
01241             avio_seek(s->pb, current_pos, SEEK_SET);
01242             asf->index_read= -1;
01243             return;
01244         }
01245         avio_skip(s->pb, gsize-24);
01246         ff_get_guid(s->pb, &g);
01247     }
01248 
01249     {
01250         int64_t itime, last_pos=-1;
01251         int pct, ict;
01252         int i;
01253         int64_t av_unused gsize= avio_rl64(s->pb);
01254         ff_get_guid(s->pb, &g);
01255         itime=avio_rl64(s->pb);
01256         pct=avio_rl32(s->pb);
01257         ict=avio_rl32(s->pb);
01258         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01259 
01260         for (i=0;i<ict;i++){
01261             int pktnum=avio_rl32(s->pb);
01262             int pktct =avio_rl16(s->pb);
01263             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01264             int64_t index_pts= FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
01265 
01266             if(pos != last_pos){
01267             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d  pts: %"PRId64"\n", pktnum, pktct, index_pts);
01268             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01269             last_pos=pos;
01270             }
01271         }
01272         asf->index_read= 1;
01273     }
01274     avio_seek(s->pb, current_pos, SEEK_SET);
01275 }
01276 
01277 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01278 {
01279     ASFContext *asf = s->priv_data;
01280     AVStream *st = s->streams[stream_index];
01281 
01282     if (s->packet_size <= 0)
01283         return -1;
01284 
01285     /* Try using the protocol's read_seek if available */
01286     if(s->pb) {
01287         int ret = avio_seek_time(s->pb, stream_index, pts, flags);
01288         if(ret >= 0)
01289             asf_reset_header(s);
01290         if (ret != AVERROR(ENOSYS))
01291             return ret;
01292     }
01293 
01294     if (!asf->index_read)
01295         asf_build_simple_index(s, stream_index);
01296 
01297     if((asf->index_read > 0 && st->index_entries)){
01298         int index= av_index_search_timestamp(st, pts, flags);
01299         if(index >= 0) {
01300             /* find the position */
01301             uint64_t pos = st->index_entries[index].pos;
01302 
01303             /* do the seek */
01304             av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01305             if(avio_seek(s->pb, pos, SEEK_SET) < 0)
01306                 return -1;
01307             asf_reset_header(s);
01308             return 0;
01309         }
01310     }
01311     /* no index or seeking by index failed */
01312     if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
01313         return -1;
01314     asf_reset_header(s);
01315     return 0;
01316 }
01317 
01318 AVInputFormat ff_asf_demuxer = {
01319     .name           = "asf",
01320     .long_name      = NULL_IF_CONFIG_SMALL("ASF format"),
01321     .priv_data_size = sizeof(ASFContext),
01322     .read_probe     = asf_probe,
01323     .read_header    = asf_read_header,
01324     .read_packet    = asf_read_packet,
01325     .read_close     = asf_read_close,
01326     .read_seek      = asf_read_seek,
01327     .read_timestamp = asf_read_pts,
01328     .flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
01329 };