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/common.h"
00025 #include "libavutil/avstring.h"
00026 #include "libavcodec/mpegaudio.h"
00027 #include "avformat.h"
00028 #include "riff.h"
00029 #include "asf.h"
00030 #include "asfcrypt.h"
00031 #include "avlanguage.h"
00032 
00033 void ff_mms_set_stream_selection(URLContext *h, AVFormatContext *format);
00034 
00035 #undef NDEBUG
00036 #include <assert.h>
00037 
00038 #define ASF_MAX_STREAMS 127
00039 #define FRAME_HEADER_SIZE 17
00040 // Fix Me! FRAME_HEADER_SIZE may be different.
00041 
00042 static const ff_asf_guid index_guid = {
00043     0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
00044 };
00045 
00046 static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
00047     0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
00048 };
00049 /**********************************/
00050 /* decoding */
00051 
00052 int ff_guidcmp(const void *g1, const void *g2)
00053 {
00054     return memcmp(g1, g2, sizeof(ff_asf_guid));
00055 }
00056 
00057 #ifdef DEBUG
00058 #define PRINT_IF_GUID(g,cmp) \
00059 if (!ff_guidcmp(g, &cmp)) \
00060     dprintf(NULL, "(GUID: %s) ", #cmp)
00061 
00062 static void print_guid(const ff_asf_guid *g)
00063 {
00064     int i;
00065     PRINT_IF_GUID(g, ff_asf_header);
00066     else PRINT_IF_GUID(g, ff_asf_file_header);
00067     else PRINT_IF_GUID(g, ff_asf_stream_header);
00068     else PRINT_IF_GUID(g, ff_asf_audio_stream);
00069     else PRINT_IF_GUID(g, ff_asf_audio_conceal_none);
00070     else PRINT_IF_GUID(g, ff_asf_video_stream);
00071     else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
00072     else PRINT_IF_GUID(g, ff_asf_command_stream);
00073     else PRINT_IF_GUID(g, ff_asf_comment_header);
00074     else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
00075     else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
00076     else PRINT_IF_GUID(g, ff_asf_data_header);
00077     else PRINT_IF_GUID(g, index_guid);
00078     else PRINT_IF_GUID(g, ff_asf_head1_guid);
00079     else PRINT_IF_GUID(g, ff_asf_head2_guid);
00080     else PRINT_IF_GUID(g, ff_asf_my_guid);
00081     else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
00082     else PRINT_IF_GUID(g, ff_asf_extended_content_header);
00083     else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
00084     else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
00085     else PRINT_IF_GUID(g, ff_asf_metadata_header);
00086     else PRINT_IF_GUID(g, ff_asf_marker_header);
00087     else PRINT_IF_GUID(g, stream_bitrate_guid);
00088     else PRINT_IF_GUID(g, ff_asf_language_guid);
00089     else
00090         dprintf(NULL, "(GUID: unknown) ");
00091     for(i=0;i<16;i++)
00092         dprintf(NULL, " 0x%02x,", (*g)[i]);
00093     dprintf(NULL, "}\n");
00094 }
00095 #undef PRINT_IF_GUID
00096 #else
00097 #define print_guid(g)
00098 #endif
00099 
00100 void ff_get_guid(ByteIOContext *s, ff_asf_guid *g)
00101 {
00102     assert(sizeof(*g) == 16);
00103     get_buffer(s, *g, sizeof(*g));
00104 }
00105 
00106 #if 0
00107 static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
00108 {
00109     int len, c;
00110     char *q;
00111 
00112     len = get_le16(pb);
00113     q = buf;
00114     while (len > 0) {
00115         c = get_le16(pb);
00116         if ((q - buf) < buf_size - 1)
00117             *q++ = c;
00118         len--;
00119     }
00120     *q = '\0';
00121 }
00122 #endif
00123 
00124 static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
00125 {
00126     char* q = buf;
00127     while (len > 1) {
00128         uint8_t tmp;
00129         uint32_t ch;
00130 
00131         GET_UTF16(ch, (len -= 2) >= 0 ? get_le16(pb) : 0, break;)
00132         PUT_UTF8(ch, tmp, if (q - buf < buf_size - 1) *q++ = tmp;)
00133     }
00134     if (len > 0)
00135         url_fskip(pb, len);
00136     *q = '\0';
00137 }
00138 
00139 static int asf_probe(AVProbeData *pd)
00140 {
00141     /* check file header */
00142     if (!ff_guidcmp(pd->buf, &ff_asf_header))
00143         return AVPROBE_SCORE_MAX;
00144     else
00145         return 0;
00146 }
00147 
00148 static int get_value(ByteIOContext *pb, int type){
00149     switch(type){
00150         case 2: return get_le32(pb);
00151         case 3: return get_le32(pb);
00152         case 4: return get_le64(pb);
00153         case 5: return get_le16(pb);
00154         default:return INT_MIN;
00155     }
00156 }
00157 
00158 static void get_tag(AVFormatContext *s, const char *key, int type, int len)
00159 {
00160     char *value;
00161 
00162     if ((unsigned)len >= (UINT_MAX - 1)/2)
00163         return;
00164 
00165     value = av_malloc(2*len+1);
00166     if (!value)
00167         return;
00168 
00169     if (type == 0) {         // UTF16-LE
00170         get_str16_nolen(s->pb, len, value, 2*len + 1);
00171     } else if (type > 1 && type <= 5) {  // boolean or DWORD or QWORD or WORD
00172         uint64_t num = get_value(s->pb, type);
00173         snprintf(value, len, "%"PRIu64, num);
00174     } else {
00175         url_fskip(s->pb, len);
00176         av_freep(&value);
00177         av_log(s, AV_LOG_DEBUG, "Unsupported value type %d in tag %s.\n", type, key);
00178         return;
00179     }
00180     av_metadata_set2(&s->metadata, key, value, 0);
00181     av_freep(&value);
00182 }
00183 
00184 static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
00185 {
00186     ASFContext *asf = s->priv_data;
00187     ff_asf_guid g;
00188     ByteIOContext *pb = s->pb;
00189     AVStream *st;
00190     ASFStream *asf_st;
00191     int size, i;
00192     int64_t gsize;
00193     AVRational dar[128];
00194     uint32_t bitrate[128];
00195 
00196     memset(dar, 0, sizeof(dar));
00197     memset(bitrate, 0, sizeof(bitrate));
00198 
00199     ff_get_guid(pb, &g);
00200     if (ff_guidcmp(&g, &ff_asf_header))
00201         return -1;
00202     get_le64(pb);
00203     get_le32(pb);
00204     get_byte(pb);
00205     get_byte(pb);
00206     memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
00207     for(;;) {
00208         uint64_t gpos= url_ftell(pb);
00209         ff_get_guid(pb, &g);
00210         gsize = get_le64(pb);
00211         dprintf(s, "%08"PRIx64": ", gpos);
00212         print_guid(&g);
00213         dprintf(s, "  size=0x%"PRIx64"\n", gsize);
00214         if (!ff_guidcmp(&g, &ff_asf_data_header)) {
00215             asf->data_object_offset = url_ftell(pb);
00216             // if not streaming, gsize is not unlimited (how?), and there is enough space in the file..
00217             if (!(asf->hdr.flags & 0x01) && gsize >= 100) {
00218                 asf->data_object_size = gsize - 24;
00219             } else {
00220                 asf->data_object_size = (uint64_t)-1;
00221             }
00222             break;
00223         }
00224         if (gsize < 24)
00225             return -1;
00226         if (!ff_guidcmp(&g, &ff_asf_file_header)) {
00227             ff_get_guid(pb, &asf->hdr.guid);
00228             asf->hdr.file_size          = get_le64(pb);
00229             asf->hdr.create_time        = get_le64(pb);
00230             asf->nb_packets             = get_le64(pb);
00231             asf->hdr.play_time          = get_le64(pb);
00232             asf->hdr.send_time          = get_le64(pb);
00233             asf->hdr.preroll            = get_le32(pb);
00234             asf->hdr.ignore             = get_le32(pb);
00235             asf->hdr.flags              = get_le32(pb);
00236             asf->hdr.min_pktsize        = get_le32(pb);
00237             asf->hdr.max_pktsize        = get_le32(pb);
00238             asf->hdr.max_bitrate        = get_le32(pb);
00239             s->packet_size = asf->hdr.max_pktsize;
00240         } else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
00241             enum AVMediaType type;
00242             int type_specific_size, sizeX;
00243             uint64_t total_size;
00244             unsigned int tag1;
00245             int64_t pos1, pos2, start_time;
00246             int test_for_ext_stream_audio, is_dvr_ms_audio=0;
00247 
00248             if (s->nb_streams == ASF_MAX_STREAMS) {
00249                 av_log(s, AV_LOG_ERROR, "too many streams\n");
00250                 return AVERROR(EINVAL);
00251             }
00252 
00253             pos1 = url_ftell(pb);
00254 
00255             st = av_new_stream(s, 0);
00256             if (!st)
00257                 return AVERROR(ENOMEM);
00258             av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
00259             asf_st = av_mallocz(sizeof(ASFStream));
00260             if (!asf_st)
00261                 return AVERROR(ENOMEM);
00262             st->priv_data = asf_st;
00263             start_time = asf->hdr.preroll;
00264 
00265             asf_st->stream_language_index = 128; // invalid stream index means no language info
00266 
00267             if(!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
00268                 st->duration = asf->hdr.play_time /
00269                     (10000000 / 1000) - start_time;
00270             }
00271             ff_get_guid(pb, &g);
00272 
00273             test_for_ext_stream_audio = 0;
00274             if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
00275                 type = AVMEDIA_TYPE_AUDIO;
00276             } else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
00277                 type = AVMEDIA_TYPE_VIDEO;
00278             } else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
00279                 type = AVMEDIA_TYPE_VIDEO;
00280                 st->codec->codec_id = CODEC_ID_MJPEG;
00281             } else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
00282                 type = AVMEDIA_TYPE_DATA;
00283             } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
00284                 test_for_ext_stream_audio = 1;
00285                 type = AVMEDIA_TYPE_UNKNOWN;
00286             } else {
00287                 return -1;
00288             }
00289             ff_get_guid(pb, &g);
00290             total_size = get_le64(pb);
00291             type_specific_size = get_le32(pb);
00292             get_le32(pb);
00293             st->id = get_le16(pb) & 0x7f; /* stream id */
00294             // mapping of asf ID to AV stream ID;
00295             asf->asfid2avid[st->id] = s->nb_streams - 1;
00296 
00297             get_le32(pb);
00298 
00299             if (test_for_ext_stream_audio) {
00300                 ff_get_guid(pb, &g);
00301                 if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
00302                     type = AVMEDIA_TYPE_AUDIO;
00303                     is_dvr_ms_audio=1;
00304                     ff_get_guid(pb, &g);
00305                     get_le32(pb);
00306                     get_le32(pb);
00307                     get_le32(pb);
00308                     ff_get_guid(pb, &g);
00309                     get_le32(pb);
00310                 }
00311             }
00312 
00313             st->codec->codec_type = type;
00314             if (type == AVMEDIA_TYPE_AUDIO) {
00315                 ff_get_wav_header(pb, st->codec, type_specific_size);
00316                 if (is_dvr_ms_audio) {
00317                     // codec_id and codec_tag are unreliable in dvr_ms
00318                     // files. Set them later by probing stream.
00319                     st->codec->codec_id = CODEC_ID_PROBE;
00320                     st->codec->codec_tag = 0;
00321                 }
00322                 if (st->codec->codec_id == CODEC_ID_AAC) {
00323                     st->need_parsing = AVSTREAM_PARSE_NONE;
00324                 } else {
00325                     st->need_parsing = AVSTREAM_PARSE_FULL;
00326                 }
00327                 /* We have to init the frame size at some point .... */
00328                 pos2 = url_ftell(pb);
00329                 if (gsize >= (pos2 + 8 - pos1 + 24)) {
00330                     asf_st->ds_span = get_byte(pb);
00331                     asf_st->ds_packet_size = get_le16(pb);
00332                     asf_st->ds_chunk_size = get_le16(pb);
00333                     get_le16(pb); //ds_data_size
00334                     get_byte(pb); //ds_silence_data
00335                 }
00336                 //printf("Descrambling: ps:%d cs:%d ds:%d s:%d  sd:%d\n",
00337                 //       asf_st->ds_packet_size, asf_st->ds_chunk_size,
00338                 //       asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
00339                 if (asf_st->ds_span > 1) {
00340                     if (!asf_st->ds_chunk_size
00341                         || (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1)
00342                         || asf_st->ds_packet_size % asf_st->ds_chunk_size)
00343                         asf_st->ds_span = 0; // disable descrambling
00344                 }
00345                 switch (st->codec->codec_id) {
00346                 case CODEC_ID_MP3:
00347                     st->codec->frame_size = MPA_FRAME_SIZE;
00348                     break;
00349                 case CODEC_ID_PCM_S16LE:
00350                 case CODEC_ID_PCM_S16BE:
00351                 case CODEC_ID_PCM_U16LE:
00352                 case CODEC_ID_PCM_U16BE:
00353                 case CODEC_ID_PCM_S8:
00354                 case CODEC_ID_PCM_U8:
00355                 case CODEC_ID_PCM_ALAW:
00356                 case CODEC_ID_PCM_MULAW:
00357                     st->codec->frame_size = 1;
00358                     break;
00359                 default:
00360                     /* This is probably wrong, but it prevents a crash later */
00361                     st->codec->frame_size = 1;
00362                     break;
00363                 }
00364             } else if (type == AVMEDIA_TYPE_VIDEO &&
00365                        gsize - (url_ftell(pb) - pos1 + 24) >= 51) {
00366                 get_le32(pb);
00367                 get_le32(pb);
00368                 get_byte(pb);
00369                 size = get_le16(pb); /* size */
00370                 sizeX= get_le32(pb); /* size */
00371                 st->codec->width = get_le32(pb);
00372                 st->codec->height = get_le32(pb);
00373                 /* not available for asf */
00374                 get_le16(pb); /* panes */
00375                 st->codec->bits_per_coded_sample = get_le16(pb); /* depth */
00376                 tag1 = get_le32(pb);
00377                 url_fskip(pb, 20);
00378 //                av_log(s, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
00379                 size= sizeX;
00380                 if (size > 40) {
00381                     st->codec->extradata_size = size - 40;
00382                     st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
00383                     get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
00384                 }
00385 
00386                 /* Extract palette from extradata if bpp <= 8 */
00387                 /* This code assumes that extradata contains only palette */
00388                 /* This is true for all paletted codecs implemented in ffmpeg */
00389                 if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
00390                     st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
00391 #if HAVE_BIGENDIAN
00392                     for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
00393                         st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
00394 #else
00395                     memcpy(st->codec->palctrl->palette, st->codec->extradata,
00396                            FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
00397 #endif
00398                     st->codec->palctrl->palette_changed = 1;
00399                 }
00400 
00401                 st->codec->codec_tag = tag1;
00402                 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
00403                 if(tag1 == MKTAG('D', 'V', 'R', ' ')){
00404                     st->need_parsing = AVSTREAM_PARSE_FULL;
00405                     // 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
00406                     st->codec->width  =
00407                     st->codec->height = 0;
00408                     av_freep(&st->codec->extradata);
00409                     st->codec->extradata_size=0;
00410                 }
00411                 if(st->codec->codec_id == CODEC_ID_H264)
00412                     st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
00413             }
00414             pos2 = url_ftell(pb);
00415             url_fskip(pb, gsize - (pos2 - pos1 + 24));
00416         } else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
00417             int len1, len2, len3, len4, len5;
00418 
00419             len1 = get_le16(pb);
00420             len2 = get_le16(pb);
00421             len3 = get_le16(pb);
00422             len4 = get_le16(pb);
00423             len5 = get_le16(pb);
00424             get_tag(s, "title"    , 0, len1);
00425             get_tag(s, "author"   , 0, len2);
00426             get_tag(s, "copyright", 0, len3);
00427             get_tag(s, "comment"  , 0, len4);
00428             url_fskip(pb, len5);
00429         } else if (!ff_guidcmp(&g, &stream_bitrate_guid)) {
00430             int stream_count = get_le16(pb);
00431             int j;
00432 
00433 //            av_log(s, AV_LOG_ERROR, "stream bitrate properties\n");
00434 //            av_log(s, AV_LOG_ERROR, "streams %d\n", streams);
00435             for(j = 0; j < stream_count; j++) {
00436                 int flags, bitrate, stream_id;
00437 
00438                 flags= get_le16(pb);
00439                 bitrate= get_le32(pb);
00440                 stream_id= (flags & 0x7f);
00441 //                av_log(s, AV_LOG_ERROR, "flags: 0x%x stream id %d, bitrate %d\n", flags, stream_id, bitrate);
00442                 asf->stream_bitrates[stream_id]= bitrate;
00443             }
00444         } else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
00445             int j;
00446             int stream_count = get_le16(pb);
00447             for(j = 0; j < stream_count; j++) {
00448                 char lang[6];
00449                 unsigned int lang_len = get_byte(pb);
00450                 get_str16_nolen(pb, lang_len, lang, sizeof(lang));
00451                 if (j < 128)
00452                     av_strlcpy(asf->stream_languages[j], lang, sizeof(*asf->stream_languages));
00453             }
00454         } else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
00455             int desc_count, i;
00456 
00457             desc_count = get_le16(pb);
00458             for(i=0;i<desc_count;i++) {
00459                     int name_len,value_type,value_len;
00460                     char name[1024];
00461 
00462                     name_len = get_le16(pb);
00463                     if (name_len%2)     // must be even, broken lavf versions wrote len-1
00464                         name_len += 1;
00465                     get_str16_nolen(pb, name_len, name, sizeof(name));
00466                     value_type = get_le16(pb);
00467                     value_len  = get_le16(pb);
00468                     if (!value_type && value_len%2)
00469                         value_len += 1;
00474                     if (!strcmp(name, "AspectRatioX")){
00475                         dar[0].num= get_value(s->pb, value_type);
00476                     } else if(!strcmp(name, "AspectRatioY")){
00477                         dar[0].den= get_value(s->pb, value_type);
00478                     } else
00479                         get_tag(s, name, value_type, value_len);
00480             }
00481         } else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
00482             int n, stream_num, name_len, value_len, value_type, value_num;
00483             n = get_le16(pb);
00484 
00485             for(i=0;i<n;i++) {
00486                 char name[1024];
00487 
00488                 get_le16(pb); //lang_list_index
00489                 stream_num= get_le16(pb);
00490                 name_len=   get_le16(pb);
00491                 value_type= get_le16(pb);
00492                 value_len=  get_le32(pb);
00493 
00494                 get_str16_nolen(pb, name_len, name, sizeof(name));
00495 //av_log(s, AV_LOG_ERROR, "%d %d %d %d %d <%s>\n", i, stream_num, name_len, value_type, value_len, name);
00496                 value_num= get_le16(pb);//we should use get_value() here but it does not work 2 is le16 here but le32 elsewhere
00497                 url_fskip(pb, value_len - 2);
00498 
00499                 if(stream_num<128){
00500                     if     (!strcmp(name, "AspectRatioX")) dar[stream_num].num= value_num;
00501                     else if(!strcmp(name, "AspectRatioY")) dar[stream_num].den= value_num;
00502                 }
00503             }
00504         } else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
00505             int ext_len, payload_ext_ct, stream_ct;
00506             uint32_t ext_d, leak_rate, stream_num;
00507             unsigned int stream_languageid_index;
00508 
00509             get_le64(pb); // starttime
00510             get_le64(pb); // endtime
00511             leak_rate = get_le32(pb); // leak-datarate
00512             get_le32(pb); // bucket-datasize
00513             get_le32(pb); // init-bucket-fullness
00514             get_le32(pb); // alt-leak-datarate
00515             get_le32(pb); // alt-bucket-datasize
00516             get_le32(pb); // alt-init-bucket-fullness
00517             get_le32(pb); // max-object-size
00518             get_le32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
00519             stream_num = get_le16(pb); // stream-num
00520 
00521             stream_languageid_index = get_le16(pb); // stream-language-id-index
00522             if (stream_num < 128)
00523                 asf->streams[stream_num].stream_language_index = stream_languageid_index;
00524 
00525             get_le64(pb); // avg frametime in 100ns units
00526             stream_ct = get_le16(pb); //stream-name-count
00527             payload_ext_ct = get_le16(pb); //payload-extension-system-count
00528 
00529             if (stream_num < 128)
00530                 bitrate[stream_num] = leak_rate;
00531 
00532             for (i=0; i<stream_ct; i++){
00533                 get_le16(pb);
00534                 ext_len = get_le16(pb);
00535                 url_fseek(pb, ext_len, SEEK_CUR);
00536             }
00537 
00538             for (i=0; i<payload_ext_ct; i++){
00539                 ff_get_guid(pb, &g);
00540                 ext_d=get_le16(pb);
00541                 ext_len=get_le32(pb);
00542                 url_fseek(pb, ext_len, SEEK_CUR);
00543             }
00544 
00545             // there could be a optional stream properties object to follow
00546             // if so the next iteration will pick it up
00547             continue;
00548         } else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
00549             int v1, v2;
00550             ff_get_guid(pb, &g);
00551             v1 = get_le32(pb);
00552             v2 = get_le16(pb);
00553             continue;
00554         } else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
00555             int i, count, name_len;
00556             char name[1024];
00557 
00558             get_le64(pb);            // reserved 16 bytes
00559             get_le64(pb);            // ...
00560             count = get_le32(pb);    // markers count
00561             get_le16(pb);            // reserved 2 bytes
00562             name_len = get_le16(pb); // name length
00563             for(i=0;i<name_len;i++){
00564                 get_byte(pb); // skip the name
00565             }
00566 
00567             for(i=0;i<count;i++){
00568                 int64_t pres_time;
00569                 int name_len;
00570 
00571                 get_le64(pb);             // offset, 8 bytes
00572                 pres_time = get_le64(pb); // presentation time
00573                 get_le16(pb);             // entry length
00574                 get_le32(pb);             // send time
00575                 get_le32(pb);             // flags
00576                 name_len = get_le32(pb);  // name length
00577                 get_str16_nolen(pb, name_len * 2, name, sizeof(name));
00578                 ff_new_chapter(s, i, (AVRational){1, 10000000}, pres_time, AV_NOPTS_VALUE, name );
00579             }
00580 #if 0
00581         } else if (!ff_guidcmp(&g, &ff_asf_codec_comment_header)) {
00582             int len, v1, n, num;
00583             char str[256], *q;
00584             char tag[16];
00585 
00586             ff_get_guid(pb, &g);
00587             print_guid(&g);
00588 
00589             n = get_le32(pb);
00590             for(i=0;i<n;i++) {
00591                 num = get_le16(pb); /* stream number */
00592                 get_str16(pb, str, sizeof(str));
00593                 get_str16(pb, str, sizeof(str));
00594                 len = get_le16(pb);
00595                 q = tag;
00596                 while (len > 0) {
00597                     v1 = get_byte(pb);
00598                     if ((q - tag) < sizeof(tag) - 1)
00599                         *q++ = v1;
00600                     len--;
00601                 }
00602                 *q = '\0';
00603             }
00604 #endif
00605         } else if (url_feof(pb)) {
00606             return -1;
00607         } else {
00608             if (!s->keylen) {
00609                 if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
00610                     av_log(s, AV_LOG_WARNING, "DRM protected stream detected, decoding will likely fail!\n");
00611                 } else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
00612                     av_log(s, AV_LOG_WARNING, "Ext DRM protected stream detected, decoding will likely fail!\n");
00613                 } else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
00614                     av_log(s, AV_LOG_WARNING, "Digital signature detected, decoding will likely fail!\n");
00615                 }
00616             }
00617         }
00618         if(url_ftell(pb) != gpos + gsize)
00619             av_log(s, AV_LOG_DEBUG, "gpos mismatch our pos=%"PRIu64", end=%"PRIu64"\n", url_ftell(pb)-gpos, gsize);
00620         url_fseek(pb, gpos + gsize, SEEK_SET);
00621     }
00622     ff_get_guid(pb, &g);
00623     get_le64(pb);
00624     get_byte(pb);
00625     get_byte(pb);
00626     if (url_feof(pb))
00627         return -1;
00628     asf->data_offset = url_ftell(pb);
00629     asf->packet_size_left = 0;
00630 
00631 
00632     for(i=0; i<128; i++){
00633         int stream_num= asf->asfid2avid[i];
00634         if(stream_num>=0){
00635             AVStream *st = s->streams[stream_num];
00636             if (!st->codec->bit_rate)
00637                 st->codec->bit_rate = bitrate[i];
00638             if (dar[i].num > 0 && dar[i].den > 0){
00639                 av_reduce(&st->sample_aspect_ratio.num,
00640                           &st->sample_aspect_ratio.den,
00641                           dar[i].num, dar[i].den, INT_MAX);
00642             } else if ((dar[0].num > 0) && (dar[0].den > 0) && (st->codec->codec_type==AVMEDIA_TYPE_VIDEO)) // Use ASF container value if the stream doesn't AR set.
00643                 av_reduce(&st->sample_aspect_ratio.num,
00644                           &st->sample_aspect_ratio.den,
00645                           dar[0].num, dar[0].den, INT_MAX);
00646 
00647 //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);
00648 
00649             // copy and convert language codes to the frontend
00650             if (asf->streams[i].stream_language_index < 128) {
00651                 const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
00652                 if (rfc1766 && strlen(rfc1766) > 1) {
00653                     const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
00654                     const char *iso6392 = av_convert_lang_to(primary_tag, AV_LANG_ISO639_2_BIBL);
00655                     if (iso6392)
00656                         av_metadata_set2(&st->metadata, "language", iso6392, 0);
00657                 }
00658             }
00659         }
00660     }
00661 
00662     ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
00663 
00664     return 0;
00665 }
00666 
00667 #define DO_2BITS(bits, var, defval) \
00668     switch (bits & 3) \
00669     { \
00670     case 3: var = get_le32(pb); rsize += 4; break; \
00671     case 2: var = get_le16(pb); rsize += 2; break; \
00672     case 1: var = get_byte(pb); rsize++; break; \
00673     default: var = defval; break; \
00674     }
00675 
00682 static int ff_asf_get_packet(AVFormatContext *s, ByteIOContext *pb)
00683 {
00684     ASFContext *asf = s->priv_data;
00685     uint32_t packet_length, padsize;
00686     int rsize = 8;
00687     int c, d, e, off;
00688 
00689     // if we do not know packet size, allow skipping up to 32 kB
00690     off= 32768;
00691     if (s->packet_size > 0)
00692         off= (url_ftell(pb) - s->data_offset) % s->packet_size + 3;
00693 
00694     c=d=e=-1;
00695     while(off-- > 0){
00696         c=d; d=e;
00697         e= get_byte(pb);
00698         if(c == 0x82 && !d && !e)
00699             break;
00700     }
00701 
00702     if (c != 0x82) {
00709         if (url_ferror(pb) == AVERROR(EAGAIN))
00710             return AVERROR(EAGAIN);
00711         if (!url_feof(pb))
00712             av_log(s, AV_LOG_ERROR, "ff asf bad header %x  at:%"PRId64"\n", c, url_ftell(pb));
00713     }
00714     if ((c & 0x8f) == 0x82) {
00715         if (d || e) {
00716             if (!url_feof(pb))
00717                 av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
00718             return -1;
00719         }
00720         c= get_byte(pb);
00721         d= get_byte(pb);
00722         rsize+=3;
00723     }else{
00724         url_fseek(pb, -1, SEEK_CUR); //FIXME
00725     }
00726 
00727     asf->packet_flags    = c;
00728     asf->packet_property = d;
00729 
00730     DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
00731     DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
00732     DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
00733 
00734     //the following checks prevent overflows and infinite loops
00735     if(!packet_length || packet_length >= (1U<<29)){
00736         av_log(s, AV_LOG_ERROR, "invalid packet_length %d at:%"PRId64"\n", packet_length, url_ftell(pb));
00737         return -1;
00738     }
00739     if(padsize >= packet_length){
00740         av_log(s, AV_LOG_ERROR, "invalid padsize %d at:%"PRId64"\n", padsize, url_ftell(pb));
00741         return -1;
00742     }
00743 
00744     asf->packet_timestamp = get_le32(pb);
00745     get_le16(pb); /* duration */
00746     // rsize has at least 11 bytes which have to be present
00747 
00748     if (asf->packet_flags & 0x01) {
00749         asf->packet_segsizetype = get_byte(pb); rsize++;
00750         asf->packet_segments = asf->packet_segsizetype & 0x3f;
00751     } else {
00752         asf->packet_segments = 1;
00753         asf->packet_segsizetype = 0x80;
00754     }
00755     asf->packet_size_left = packet_length - padsize - rsize;
00756     if (packet_length < asf->hdr.min_pktsize)
00757         padsize += asf->hdr.min_pktsize - packet_length;
00758     asf->packet_padsize = padsize;
00759     dprintf(s, "packet: size=%d padsize=%d  left=%d\n", s->packet_size, asf->packet_padsize, asf->packet_size_left);
00760     return 0;
00761 }
00762 
00767 static int asf_read_frame_header(AVFormatContext *s, ByteIOContext *pb){
00768     ASFContext *asf = s->priv_data;
00769     int rsize = 1;
00770     int num = get_byte(pb);
00771     int64_t ts0, ts1;
00772 
00773     asf->packet_segments--;
00774     asf->packet_key_frame = num >> 7;
00775     asf->stream_index = asf->asfid2avid[num & 0x7f];
00776     // sequence should be ignored!
00777     DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
00778     DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
00779     DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
00780 //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);
00781     if (asf->packet_replic_size >= 8) {
00782         asf->packet_obj_size = get_le32(pb);
00783         if(asf->packet_obj_size >= (1<<24) || asf->packet_obj_size <= 0){
00784             av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
00785             return -1;
00786         }
00787         asf->packet_frag_timestamp = get_le32(pb); // timestamp
00788         if(asf->packet_replic_size >= 8+38+4){
00789 //            for(i=0; i<asf->packet_replic_size-8; i++)
00790 //                av_log(s, AV_LOG_DEBUG, "%02X ",get_byte(pb));
00791 //            av_log(s, AV_LOG_DEBUG, "\n");
00792             url_fskip(pb, 10);
00793             ts0= get_le64(pb);
00794             ts1= get_le64(pb);
00795             url_fskip(pb, 12);
00796             get_le32(pb);
00797             url_fskip(pb, asf->packet_replic_size - 8 - 38 - 4);
00798             if(ts0!= -1) asf->packet_frag_timestamp= ts0/10000;
00799             else         asf->packet_frag_timestamp= AV_NOPTS_VALUE;
00800         }else
00801             url_fskip(pb, asf->packet_replic_size - 8);
00802         rsize += asf->packet_replic_size; // FIXME - check validity
00803     } else if (asf->packet_replic_size==1){
00804         // multipacket - frag_offset is beginning timestamp
00805         asf->packet_time_start = asf->packet_frag_offset;
00806         asf->packet_frag_offset = 0;
00807         asf->packet_frag_timestamp = asf->packet_timestamp;
00808 
00809         asf->packet_time_delta = get_byte(pb);
00810         rsize++;
00811     }else if(asf->packet_replic_size!=0){
00812         av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n", asf->packet_replic_size);
00813         return -1;
00814     }
00815     if (asf->packet_flags & 0x01) {
00816         DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
00817         if(asf->packet_frag_size > asf->packet_size_left - rsize){
00818             av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid\n");
00819             return -1;
00820         }
00821         //printf("Fragsize %d\n", asf->packet_frag_size);
00822     } else {
00823         asf->packet_frag_size = asf->packet_size_left - rsize;
00824         //printf("Using rest  %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
00825     }
00826     if (asf->packet_replic_size == 1) {
00827         asf->packet_multi_size = asf->packet_frag_size;
00828         if (asf->packet_multi_size > asf->packet_size_left)
00829             return -1;
00830     }
00831     asf->packet_size_left -= rsize;
00832     //printf("___objsize____  %d   %d    rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
00833 
00834     return 0;
00835 }
00836 
00846 static int ff_asf_parse_packet(AVFormatContext *s, ByteIOContext *pb, AVPacket *pkt)
00847 {
00848     ASFContext *asf = s->priv_data;
00849     ASFStream *asf_st = 0;
00850     for (;;) {
00851         int ret;
00852         if(url_feof(pb))
00853             return AVERROR_EOF;
00854         if (asf->packet_size_left < FRAME_HEADER_SIZE
00855             || asf->packet_segments < 1) {
00856             //asf->packet_size_left <= asf->packet_padsize) {
00857             int ret = asf->packet_size_left + asf->packet_padsize;
00858             //printf("PacketLeftSize:%d  Pad:%d Pos:%"PRId64"\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
00859             assert(ret>=0);
00860             /* fail safe */
00861             url_fskip(pb, ret);
00862 
00863             asf->packet_pos= url_ftell(pb);
00864             if (asf->data_object_size != (uint64_t)-1 &&
00865                 (asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
00866                 return AVERROR_EOF; /* Do not exceed the size of the data object */
00867             return 1;
00868         }
00869         if (asf->packet_time_start == 0) {
00870             if(asf_read_frame_header(s, pb) < 0){
00871                 asf->packet_segments= 0;
00872                 continue;
00873             }
00874             if (asf->stream_index < 0
00875                 || s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
00876                 || (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
00877                 ) {
00878                 asf->packet_time_start = 0;
00879                 /* unhandled packet (should not happen) */
00880                 url_fskip(pb, asf->packet_frag_size);
00881                 asf->packet_size_left -= asf->packet_frag_size;
00882                 if(asf->stream_index < 0)
00883                     av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n", asf->packet_frag_size);
00884                 continue;
00885             }
00886             asf->asf_st = s->streams[asf->stream_index]->priv_data;
00887         }
00888         asf_st = asf->asf_st;
00889 
00890         if (asf->packet_replic_size == 1) {
00891             // frag_offset is here used as the beginning timestamp
00892             asf->packet_frag_timestamp = asf->packet_time_start;
00893             asf->packet_time_start += asf->packet_time_delta;
00894             asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
00895             asf->packet_size_left--;
00896             asf->packet_multi_size--;
00897             if (asf->packet_multi_size < asf->packet_obj_size)
00898             {
00899                 asf->packet_time_start = 0;
00900                 url_fskip(pb, asf->packet_multi_size);
00901                 asf->packet_size_left -= asf->packet_multi_size;
00902                 continue;
00903             }
00904             asf->packet_multi_size -= asf->packet_obj_size;
00905             //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);
00906         }
00907         if(   /*asf->packet_frag_size == asf->packet_obj_size*/
00908               asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size
00909            && asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size){
00910             av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
00911                 asf_st->frag_offset, asf->packet_frag_size,
00912                 asf->packet_obj_size, asf_st->pkt.size);
00913             asf->packet_obj_size= asf_st->pkt.size;
00914         }
00915 
00916         if (   asf_st->pkt.size != asf->packet_obj_size
00917             || asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) { //FIXME is this condition sufficient?
00918             if(asf_st->pkt.data){
00919                 av_log(s, AV_LOG_INFO, "freeing incomplete packet size %d, new %d\n", asf_st->pkt.size, asf->packet_obj_size);
00920                 asf_st->frag_offset = 0;
00921                 av_free_packet(&asf_st->pkt);
00922             }
00923             /* new packet */
00924             av_new_packet(&asf_st->pkt, asf->packet_obj_size);
00925             asf_st->seq = asf->packet_seq;
00926             asf_st->pkt.dts = asf->packet_frag_timestamp;
00927             asf_st->pkt.stream_index = asf->stream_index;
00928             asf_st->pkt.pos =
00929             asf_st->packet_pos= asf->packet_pos;
00930 //printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
00931 //asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & AV_PKT_FLAG_KEY,
00932 //s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO, asf->packet_obj_size);
00933             if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
00934                 asf->packet_key_frame = 1;
00935             if (asf->packet_key_frame)
00936                 asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
00937         }
00938 
00939         /* read data */
00940         //printf("READ PACKET s:%d  os:%d  o:%d,%d  l:%d   DATA:%p\n",
00941         //       s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
00942         //       asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
00943         asf->packet_size_left -= asf->packet_frag_size;
00944         if (asf->packet_size_left < 0)
00945             continue;
00946 
00947         if(   asf->packet_frag_offset >= asf_st->pkt.size
00948            || asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
00949             av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
00950                 asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
00951             continue;
00952         }
00953 
00954         ret = get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
00955                          asf->packet_frag_size);
00956         if (ret != asf->packet_frag_size) {
00957             if (ret < 0 || asf->packet_frag_offset + ret == 0)
00958                 return ret < 0 ? ret : AVERROR_EOF;
00959             if (asf_st->ds_span > 1) {
00960                 // scrambling, we can either drop it completely or fill the remainder
00961                 // TODO: should we fill the whole packet instead of just the current
00962                 // fragment?
00963                 memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
00964                        asf->packet_frag_size - ret);
00965                 ret = asf->packet_frag_size;
00966             } else
00967                 // no scrambling, so we can return partial packets
00968                 av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
00969         }
00970         if (s->key && s->keylen == 20)
00971             ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
00972                             ret);
00973         asf_st->frag_offset += ret;
00974         /* test if whole packet is read */
00975         if (asf_st->frag_offset == asf_st->pkt.size) {
00976             //workaround for macroshit radio DVR-MS files
00977             if(   s->streams[asf->stream_index]->codec->codec_id == CODEC_ID_MPEG2VIDEO
00978                && asf_st->pkt.size > 100){
00979                 int i;
00980                 for(i=0; i<asf_st->pkt.size && !asf_st->pkt.data[i]; i++);
00981                 if(i == asf_st->pkt.size){
00982                     av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
00983                     asf_st->frag_offset = 0;
00984                     av_free_packet(&asf_st->pkt);
00985                     continue;
00986                 }
00987             }
00988 
00989             /* return packet */
00990             if (asf_st->ds_span > 1) {
00991               if(asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span){
00992                     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);
00993               }else{
00994                 /* packet descrambling */
00995                 uint8_t *newdata = av_malloc(asf_st->pkt.size + FF_INPUT_BUFFER_PADDING_SIZE);
00996                 if (newdata) {
00997                     int offset = 0;
00998                     memset(newdata + asf_st->pkt.size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
00999                     while (offset < asf_st->pkt.size) {
01000                         int off = offset / asf_st->ds_chunk_size;
01001                         int row = off / asf_st->ds_span;
01002                         int col = off % asf_st->ds_span;
01003                         int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
01004                         //printf("off:%d  row:%d  col:%d  idx:%d\n", off, row, col, idx);
01005 
01006                         assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
01007                         assert(idx+1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
01008                         memcpy(newdata + offset,
01009                                asf_st->pkt.data + idx * asf_st->ds_chunk_size,
01010                                asf_st->ds_chunk_size);
01011                         offset += asf_st->ds_chunk_size;
01012                     }
01013                     av_free(asf_st->pkt.data);
01014                     asf_st->pkt.data = newdata;
01015                 }
01016               }
01017             }
01018             asf_st->frag_offset = 0;
01019             *pkt= asf_st->pkt;
01020             //printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
01021             asf_st->pkt.size = 0;
01022             asf_st->pkt.data = 0;
01023             break; // packet completed
01024         }
01025     }
01026     return 0;
01027 }
01028 
01029 static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
01030 {
01031     ASFContext *asf = s->priv_data;
01032 
01033     for (;;) {
01034         int ret;
01035 
01036         /* parse cached packets, if any */
01037         if ((ret = ff_asf_parse_packet(s, s->pb, pkt)) <= 0)
01038             return ret;
01039         if ((ret = ff_asf_get_packet(s, s->pb)) < 0)
01040             assert(asf->packet_size_left < FRAME_HEADER_SIZE || asf->packet_segments < 1);
01041         asf->packet_time_start = 0;
01042     }
01043 
01044     return 0;
01045 }
01046 
01047 // Added to support seeking after packets have been read
01048 // If information is not reset, read_packet fails due to
01049 // leftover information from previous reads
01050 static void asf_reset_header(AVFormatContext *s)
01051 {
01052     ASFContext *asf = s->priv_data;
01053     ASFStream *asf_st;
01054     int i;
01055 
01056     asf->packet_nb_frames = 0;
01057     asf->packet_size_left = 0;
01058     asf->packet_segments = 0;
01059     asf->packet_flags = 0;
01060     asf->packet_property = 0;
01061     asf->packet_timestamp = 0;
01062     asf->packet_segsizetype = 0;
01063     asf->packet_segments = 0;
01064     asf->packet_seq = 0;
01065     asf->packet_replic_size = 0;
01066     asf->packet_key_frame = 0;
01067     asf->packet_padsize = 0;
01068     asf->packet_frag_offset = 0;
01069     asf->packet_frag_size = 0;
01070     asf->packet_frag_timestamp = 0;
01071     asf->packet_multi_size = 0;
01072     asf->packet_obj_size = 0;
01073     asf->packet_time_delta = 0;
01074     asf->packet_time_start = 0;
01075 
01076     for(i=0; i<s->nb_streams; i++){
01077         asf_st= s->streams[i]->priv_data;
01078         av_free_packet(&asf_st->pkt);
01079         asf_st->frag_offset=0;
01080         asf_st->seq=0;
01081     }
01082     asf->asf_st= NULL;
01083 }
01084 
01085 static int asf_read_close(AVFormatContext *s)
01086 {
01087     int i;
01088 
01089     asf_reset_header(s);
01090     for(i=0;i<s->nb_streams;i++) {
01091         AVStream *st = s->streams[i];
01092         av_free(st->codec->palctrl);
01093     }
01094     return 0;
01095 }
01096 
01097 static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
01098 {
01099     AVPacket pkt1, *pkt = &pkt1;
01100     ASFStream *asf_st;
01101     int64_t pts;
01102     int64_t pos= *ppos;
01103     int i;
01104     int64_t start_pos[ASF_MAX_STREAMS];
01105 
01106     for(i=0; i<s->nb_streams; i++){
01107         start_pos[i]= pos;
01108     }
01109 
01110     if (s->packet_size > 0)
01111         pos= (pos+s->packet_size-1-s->data_offset)/s->packet_size*s->packet_size+ s->data_offset;
01112     *ppos= pos;
01113     url_fseek(s->pb, pos, SEEK_SET);
01114 
01115 //printf("asf_read_pts\n");
01116     asf_reset_header(s);
01117     for(;;){
01118         if (av_read_frame(s, pkt) < 0){
01119             av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
01120             return AV_NOPTS_VALUE;
01121         }
01122 
01123         pts= pkt->pts;
01124 
01125         av_free_packet(pkt);
01126         if(pkt->flags&AV_PKT_FLAG_KEY){
01127             i= pkt->stream_index;
01128 
01129             asf_st= s->streams[i]->priv_data;
01130 
01131 //            assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
01132             pos= asf_st->packet_pos;
01133 
01134             av_add_index_entry(s->streams[i], pos, pts, pkt->size, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
01135             start_pos[i]= asf_st->packet_pos + 1;
01136 
01137             if(pkt->stream_index == stream_index)
01138                break;
01139         }
01140     }
01141 
01142     *ppos= pos;
01143 //printf("found keyframe at %"PRId64" stream %d stamp:%"PRId64"\n", *ppos, stream_index, pts);
01144 
01145     return pts;
01146 }
01147 
01148 static void asf_build_simple_index(AVFormatContext *s, int stream_index)
01149 {
01150     ff_asf_guid g;
01151     ASFContext *asf = s->priv_data;
01152     int64_t current_pos= url_ftell(s->pb);
01153     int i;
01154 
01155     url_fseek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
01156     ff_get_guid(s->pb, &g);
01157 
01158     /* the data object can be followed by other top-level objects,
01159        skip them until the simple index object is reached */
01160     while (ff_guidcmp(&g, &index_guid)) {
01161         int64_t gsize= get_le64(s->pb);
01162         if (gsize < 24 || url_feof(s->pb)) {
01163             url_fseek(s->pb, current_pos, SEEK_SET);
01164             return;
01165         }
01166         url_fseek(s->pb, gsize-24, SEEK_CUR);
01167         ff_get_guid(s->pb, &g);
01168     }
01169 
01170     {
01171         int64_t itime, last_pos=-1;
01172         int pct, ict;
01173         int64_t av_unused gsize= get_le64(s->pb);
01174         ff_get_guid(s->pb, &g);
01175         itime=get_le64(s->pb);
01176         pct=get_le32(s->pb);
01177         ict=get_le32(s->pb);
01178         av_log(s, AV_LOG_DEBUG, "itime:0x%"PRIx64", pct:%d, ict:%d\n",itime,pct,ict);
01179 
01180         for (i=0;i<ict;i++){
01181             int pktnum=get_le32(s->pb);
01182             int pktct =get_le16(s->pb);
01183             int64_t pos      = s->data_offset + s->packet_size*(int64_t)pktnum;
01184             int64_t index_pts= av_rescale(itime, i, 10000);
01185 
01186             if(pos != last_pos){
01187             av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d\n", pktnum, pktct);
01188             av_add_index_entry(s->streams[stream_index], pos, index_pts, s->packet_size, 0, AVINDEX_KEYFRAME);
01189             last_pos=pos;
01190             }
01191         }
01192         asf->index_read= 1;
01193     }
01194     url_fseek(s->pb, current_pos, SEEK_SET);
01195 }
01196 
01197 static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
01198 {
01199     ASFContext *asf = s->priv_data;
01200     AVStream *st = s->streams[stream_index];
01201     int64_t pos;
01202     int index;
01203 
01204     if (s->packet_size <= 0)
01205         return -1;
01206 
01207     /* Try using the protocol's read_seek if available */
01208     if(s->pb) {
01209         int ret = av_url_read_fseek(s->pb, stream_index, pts, flags);
01210         if(ret >= 0)
01211             asf_reset_header(s);
01212         if (ret != AVERROR(ENOSYS))
01213             return ret;
01214     }
01215 
01216     if (!asf->index_read)
01217         asf_build_simple_index(s, stream_index);
01218 
01219     if(!(asf->index_read && st->index_entries)){
01220         if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
01221             return -1;
01222     }else{
01223         index= av_index_search_timestamp(st, pts, flags);
01224         if(index<0)
01225             return -1;
01226 
01227         /* find the position */
01228         pos = st->index_entries[index].pos;
01229 
01230     // various attempts to find key frame have failed so far
01231     //    asf_reset_header(s);
01232     //    url_fseek(s->pb, pos, SEEK_SET);
01233     //    key_pos = pos;
01234     //     for(i=0;i<16;i++){
01235     //         pos = url_ftell(s->pb);
01236     //         if (av_read_frame(s, &pkt) < 0){
01237     //             av_log(s, AV_LOG_INFO, "seek failed\n");
01238     //             return -1;
01239     //         }
01240     //         asf_st = s->streams[stream_index]->priv_data;
01241     //         pos += st->parser->frame_offset;
01242     //
01243     //         if (pkt.size > b) {
01244     //             b = pkt.size;
01245     //             key_pos = pos;
01246     //         }
01247     //
01248     //         av_free_packet(&pkt);
01249     //     }
01250 
01251         /* do the seek */
01252         av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
01253         url_fseek(s->pb, pos, SEEK_SET);
01254     }
01255     asf_reset_header(s);
01256     return 0;
01257 }
01258 
01259 AVInputFormat asf_demuxer = {
01260     "asf",
01261     NULL_IF_CONFIG_SMALL("ASF format"),
01262     sizeof(ASFContext),
01263     asf_probe,
01264     asf_read_header,
01265     asf_read_packet,
01266     asf_read_close,
01267     asf_read_seek,
01268     asf_read_pts,
01269 };