Author: mchinen Date: Mon Jul 19 01:20:46 2010 New Revision: 5864 Log: Update av_build_index based seeking to work with FLAC. Fix initial table seek to check for invalid start_time and data_offset before seeking. fix broken flag saving in av_save_index add AVSEEK_FLAG_ANY to initial seek in av_build_index Added: seek2010/seek2010_07_19_r24319.patch Added: seek2010/seek2010_07_19_r24319.patch ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ seek2010/seek2010_07_19_r24319.patch Mon Jul 19 01:20:46 2010 (r5864) @@ -0,0 +1,565 @@ +Index: ffplay.c +=================================================================== +--- ffplay.c (revision 24319) ++++ ffplay.c (working copy) +@@ -2381,6 +2381,7 @@ + AVFormatParameters params, *ap = ¶ms; + int eof=0; + int pkt_in_play_range = 0; ++ char *index_filename = NULL; + + ic = avformat_alloc_context(); + +@@ -2497,6 +2498,18 @@ + goto fail; + } + ++ if(ic->filename){ ++ index_filename = av_malloc(strlen(ic->filename) + 5); ++ strcpy(index_filename, ic->filename); ++ strcat(index_filename, ".fdx"); ++ } ++ ++ if (av_load_index_file(ic, index_filename) < 0 ) { ++ av_build_index(ic, 0); //AV_BUILD_INDEX_PARALLEL); ++ av_save_index_file(ic, index_filename); ++ } ++ av_free(index_filename); ++ + for(;;) { + if (is->abort_request) + break; +Index: libavformat/avformat.h +=================================================================== +--- libavformat/avformat.h (revision 24319) ++++ libavformat/avformat.h (working copy) +@@ -536,6 +536,16 @@ + * Number of frames that have been demuxed during av_find_stream_info() + */ + int codec_info_nb_frames; ++ ++ /* new av_seek_frame_table() support */ ++#define AV_SEEKTABLE_BUILDING 0x0001 ///< a flag set by av_build_index to mark that the index is being built ++#define AV_SEEKTABLE_CBR 0x0002 ///< a flag set by av_build_index to note that the file is constant bit rate ++#define AV_SEEKTABLE_FINISHED 0x0004 ///< a flag set by av_build_index to note that the complete index table is ready to use ++#define AV_SEEKTABLE_COPIED 0x0008 ///< a flag to note that the seek table has been copied. ++ int seek_table_flags; ++ AVIndexEntry* parallel_index_entries; ///used with AV_BUILD_INDEX_PARALLEL. should not be touched by client ++ int parallel_nb_index_entries; ++ unsigned int parallel_index_entries_allocated_size; + } AVStream; + + #define AV_PROGRAM_RUNNING 1 +@@ -1134,6 +1144,26 @@ + int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags); + + /** ++ * Builds a complete index for seeking in each stream where it is possible. ++ * Requires that the streams have been opened. ++ * Part of the new seeking api. incomplete. ++ */ ++int av_build_index(AVFormatContext *s, int flags); ++#define AV_BUILD_INDEX_PARALLEL 0x0001 ///< Builds the index via a copied demuxer streams. av_build_index with this flag can be called on a seperate thread while decoding is happening on another. ++ ++/** ++ * Saves the index table built with av_build_index to a file ++ * Returns 0 if succesful or a negative value on failure. ++ */ ++int av_save_index_file(AVFormatContext *ic, const char *filename); ++ ++/** ++ * Loads the index saved with av_save_index. ++ * Returns 0 if successful or a negative value on failure. ++ */ ++int av_load_index_file(AVFormatContext *ic, const char *filename); ++ ++/** + * Ensure the index uses less memory than the maximum specified in + * AVFormatContext.max_index_size by discarding entries if it grows + * too large. +@@ -1152,6 +1182,15 @@ + int size, int distance, int flags); + + /** ++ * Perform a dictionary search on the seek table. ++ * av_build_index must be successfully called before using this function. ++ * @param timestamp target timestamp in the time base of the given stream ++ * @param stream_index stream number ++ */ ++int av_seek_frame_table(AVFormatContext *s, ++ int stream_index, int64_t timestamp, int flags); ++ ++/** + * Perform a binary search using av_index_search_timestamp() and + * AVCodec.read_timestamp(). + * This is not supposed to be called directly by a user application, +Index: libavformat/utils.c +=================================================================== +--- libavformat/utils.c (revision 24319) ++++ libavformat/utils.c (working copy) +@@ -1031,7 +1031,6 @@ + pkt->convergence_duration = pc->convergence_duration; + } + +- + static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt) + { + AVStream *st; +@@ -1355,21 +1354,28 @@ + + st->index_entries= entries; + +- index= av_index_search_timestamp(st, timestamp, AVSEEK_FLAG_ANY); ++ //if we are building the table, the indicies added in order, so we don't have to do expensive searching. ++ if(st->seek_table_flags & AV_SEEKTABLE_BUILDING) { ++ index = st->nb_index_entries++; ++ ie = &st->index_entries[index]; ++ } ++ else { ++ index= av_index_search_timestamp(st, timestamp, AVSEEK_FLAG_ANY); + +- if(index<0){ +- index= st->nb_index_entries++; +- ie= &entries[index]; +- assert(index==0 || ie[-1].timestamp < timestamp); +- }else{ +- ie= &entries[index]; +- if(ie->timestamp != timestamp){ +- if(ie->timestamp <= timestamp) +- return -1; +- memmove(entries + index + 1, entries + index, sizeof(AVIndexEntry)*(st->nb_index_entries - index)); +- st->nb_index_entries++; +- }else if(ie->pos == pos && distance < ie->min_distance) //do not reduce the distance +- distance= ie->min_distance; ++ if(index<0){ ++ index= st->nb_index_entries++; ++ ie= &entries[index]; ++ assert(index==0 || ie[-1].timestamp < timestamp); ++ }else{ ++ ie= &entries[index]; ++ if(ie->timestamp != timestamp){ ++ if(ie->timestamp <= timestamp) ++ return -1; ++ memmove(entries + index + 1, entries + index, sizeof(AVIndexEntry)*(st->nb_index_entries - index)); ++ st->nb_index_entries++; ++ }else if(ie->pos == pos && distance < ie->min_distance) //do not reduce the distance ++ distance= ie->min_distance; ++ } + } + + ie->pos = pos; +@@ -1705,6 +1711,11 @@ + timestamp = av_rescale(timestamp, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num); + } + ++ /* if we've built a seek table, use it. */ ++ st = s->streams[stream_index]; ++ if (st->seek_table_flags & AV_SEEKTABLE_FINISHED) ++ return av_seek_frame_table(s, stream_index, timestamp, flags); ++ + /* first, we try the format specific seek */ + if (s->iformat->read_seek) + ret = s->iformat->read_seek(s, stream_index, timestamp, flags); +@@ -1742,6 +1753,402 @@ + // try some generic seek like av_seek_frame_generic() but with new ts semantics + } + ++int av_seek_frame_table(AVFormatContext *s, ++ int stream_index, int64_t timestamp, int flags) ++{ ++ int index; ++ int64_t ret; ++ AVStream *st; ++ AVIndexEntry *ie; ++ ++ st = s->streams[stream_index]; ++ ++ //TODO: see if we can do something with the CBR field. ++ if(st->seek_table_flags & AV_SEEKTABLE_CBR){ ++ int64_t target_pos; ++ int64_t start_time; ++ //if there is a constant frame length, we can compute where to jump to, but CBR may not have constant frame length ++ ++ start_time = st->start_time == AV_NOPTS_VALUE ? 0 : st->start_time; ++ target_pos = s->data_offset + s->file_size * (timestamp - start_time) * av_q2d(st->time_base) / (st->duration * av_q2d(st->time_base)); ++ if ((ret = url_fseek(s->pb, target_pos, SEEK_SET)) < 0) ++ return ret; ++ av_update_cur_dts(s, st, timestamp); ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: cbr seek ok to %lli of %lli bytes\n", target_pos, s->file_size); ++ return 0; ++ } ++ ++ //see if we need to move the parallel table over ++ if(st->parallel_index_entries) { ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: copying over parallel frames\n"); ++ av_free(st->index_entries); ++ st->index_entries = st->parallel_index_entries; ++ st->nb_index_entries = st->parallel_nb_index_entries; ++ st->index_entries_allocated_size = st->parallel_index_entries_allocated_size; ++ st->parallel_index_entries = NULL; ++ } ++ ++ index = av_index_search_timestamp(st, timestamp, flags); ++ ++ /* this function should only be called after the table is complete. */ ++ if(index < 0 || index >= st->nb_index_entries-1){ ++ return -1; ++ } ++ ++ ff_read_frame_flush(s); ++ /* we use the native seek function if it exists, (still have to modify them to use seek_table) */ ++ if (s->iformat->read_seek){ ++ if(s->iformat->read_seek(s, stream_index, timestamp, flags) >= 0) { ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: table seeked using native function\n"); ++ return 0; ++ } ++ } ++ ++ ie = &st->index_entries[index]; ++ if ((ret = url_fseek(s->pb, ie->pos, SEEK_SET)) < 0) ++ return ret; ++ av_update_cur_dts(s, st, ie->timestamp); ++ ++ { ++ float request_time = (((float)timestamp/st->time_base.den)*st->time_base.num); ++ float actual_time = (((float)ie->timestamp/st->time_base.den)*st->time_base.num); ++ float time_base_inv = ((float)st->time_base.den/st->time_base.num); ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: table seeked to %.2fs (actual request was %.2fs), timebaseinv %f, samplerate of %d\n",actual_time, request_time, time_base_inv, st->codec->sample_rate ); ++ } ++ return 0; ++} ++ ++//if we don't have the number of frames, we just guess. ++#define AV_DETECT_CBR_FPS_GUESS 10 ++static int av_detect_cbr(AVFormatContext *s, AVStream *st) { ++ //check the stream's codec to see if a number of frames are listed, but we can't assume that is available. ++ if(s->data_offset > 0 && s->file_size > 0 && s->data_offset != s->file_size && st->codec && st->duration > 0) { ++ double sec_duration = st->duration * av_q2d(st->time_base); ++ int nb_frames = st->nb_frames?st->nb_frames:(sec_duration*AV_DETECT_CBR_FPS_GUESS); ++ int64_t br_dur_len = (st->codec->bit_rate * sec_duration)/8; ++ int64_t min_len = (s->file_size - s->data_offset) * (1 - 2.0/nb_frames); ++ int64_t max_len = (s->file_size - s->data_offset) * (1 + 2.0/nb_frames); ++ ++ if(min_len < br_dur_len && br_dur_len < max_len) { ++ av_log(s, AV_LOG_DEBUG, "cbr ok (%lli < %lli < %lli) with bitrate=%i, timebase=%i/%i, duration = %f(%lli), nb_frames = %lli, offset= %lli\n", ++ min_len, br_dur_len, max_len, st->codec->bit_rate,st->time_base.num,st->time_base.den, st->duration*av_q2d(st->time_base),st->duration,st->nb_frames,s->data_offset); ++ return 1; ++ } ++ av_log(s, AV_LOG_DEBUG, "cbr failed !(%lli < %lli < %lli) with bitrate=%i, timebase=%i/%i, duration = %f(%lli), nb_frames = %lli, offset= %lli\n", ++ min_len, br_dur_len, max_len, st->codec->bit_rate,st->time_base.num,st->time_base.den, st->duration*av_q2d(st->time_base),st->duration,st->nb_frames,s->data_offset); ++ }else { ++ av_log(s, AV_LOG_DEBUG, "no cbr test with bitrate=%i, timebase=%i/%i, duration = %f(%lli), nb_frames = %lli, offset= %lli\n", ++ st->codec?st->codec->bit_rate:-1,st->time_base.num,st->time_base.den, st->duration*av_q2d(st->time_base),st->duration,st->nb_frames,s->data_offset); ++ } ++ ++ return 0; ++} ++ ++/** ++ * Starts building a index for seeking. ++ * TODO: use a different file pointer so we can do this in a thread-safe manner, ++ * as there are cases when the user will want to playback while building the index ++ **/ ++int av_build_index(AVFormatContext *s, int flags) ++{ ++ AVStream *st; ++ int ret; ++ int stream_index; ++ int i; ++ int orig_flags; ++ ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: starting building index\n"); ++ stream_index = av_find_default_stream_index(s); ++ if(stream_index < 0) ++ return -1; ++ ++ st = s->streams[stream_index]; ++ /* TODO: check if this stream is CBR and the codec has a seek by timestamp. */ ++ /* if this is true then we can set a flag and exit here. */ ++ if(0 && av_detect_cbr(s,st)) { ++ st->seek_table_flags |= AV_SEEKTABLE_CBR | AV_SEEKTABLE_FINISHED; ++ } else if(0) { ++ /* TODO: for this case see if we have a special method for generating the table */ ++ /* specific to a given format. */ ++ } else if(st->nb_frames!=0 && st->nb_index_entries > st->nb_frames/2) { ++ /* some demuxers load a complete index upon file open. */ ++ st->seek_table_flags |= AV_SEEKTABLE_COPIED; ++ } else { ++ AVFormatContext *build_ic; ++ AVPacket pkt; ++ ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: building index from scratch\n"); ++ ++ /* if the client needs it to be threadsafe, create a new format context to read from. */ ++ if(flags & AV_BUILD_INDEX_PARALLEL) { ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: making thread-safe copy of streams\n"); ++ build_ic = avformat_alloc_context(); ++ ret = av_open_input_file(&build_ic, s->filename, s->iformat, 0, NULL); ++ ++ if(ret < 0) { ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: error re-opening file/streams: %i\n", ret); ++ goto cleanup; ++ } ++ if(build_ic->nb_streams != s->nb_streams) { ++ ret = -1; ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: cloned AVFormatContext has different number of streams!"); ++ goto cleanup; ++ } ++ ++ for(i = 0; i < build_ic->nb_streams; i++) { ++ AVStream *build_st= build_ic->streams[i]; ++ AVCodecContext *avctx = build_st->codec; ++ AVCodec *pcodec; ++ build_ic->streams[i]->discard = AVDISCARD_DEFAULT; ++ ++ //compare with the orignal stream's context, and if opened, copy settings and open the clone ++ if(s->streams[i]->codec->priv_data) { ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: copying stream based on priv_data\n"); ++ if((ret = avcodec_copy_context(avctx, s->streams[i]->codec)) < 0) { ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: error copying codec:%i\n", ret); ++ goto cleanup; ++ } ++ pcodec = avcodec_find_decoder(avctx->codec_id); ++ if((ret = avcodec_open(avctx,pcodec)) < 0) { ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: error opening codec:%i\n", ret); ++ goto cleanup; ++ } ++ } ++ } ++ } else { ++ build_ic = s; ++ } ++ ++ /* default table generation behavior from av_seek_frame_generic */ ++ /* TODO: see why s->data_offset is the file length for avi/mp4 and others */ ++ if ((ret = url_fseek(build_ic->pb, 0/*s->data_offset*/, SEEK_SET)) < 0){ ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: error building index: %i\n", ret); ++ goto cleanup; ++ } ++ ++ orig_flags = build_ic->flags; ++ build_ic->flags |= AVFMT_FLAG_GENPTS; ++ for(i=0;; i++) { ++ do{ ++ ret = av_read_frame(build_ic, &pkt); ++ }while(ret == AVERROR(EAGAIN)); ++ if(ret<0) ++ break; ++ av_free_packet(&pkt); ++ } ++ build_ic->flags = orig_flags; ++ ret = 0; ++ cleanup: ++ if(flags & AV_BUILD_INDEX_PARALLEL) { ++ //TODO: delay/wait till the main index signals us that we are okay to swap ++ if(build_ic) { ++ //take the index over from our clone ++ for(i = 0; i < build_ic->nb_streams; i++) { ++ if(ret >= 0) { ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: marking %i frames from parallel stream ready for copy\n", build_ic->streams[i]->nb_index_entries); ++ s->streams[i]->parallel_index_entries = build_ic->streams[i]->index_entries; ++ s->streams[i]->parallel_nb_index_entries = build_ic->streams[i]->nb_index_entries; ++ s->streams[i]->parallel_index_entries_allocated_size = build_ic->streams[i]->index_entries_allocated_size; ++ build_ic->streams[i]->index_entries = NULL; ++ s->streams[i]->seek_table_flags |= AV_SEEKTABLE_FINISHED; ++ } ++ avcodec_close(build_ic->streams[i]->codec); ++ } ++ av_close_input_file(build_ic); ++ } ++ } ++ if(ret < 0) ++ return ret; ++ } ++ ++ /* since we may have moved the read cursor to the end, return seek to start of stream for non-parallel clients. Not sure if this the desired behavior. */ ++ if( !(flags & AV_BUILD_INDEX_PARALLEL) && !(st->seek_table_flags & AV_SEEKTABLE_COPIED) ) { ++ ff_read_frame_flush(s); ++ for(i=0; i<s->nb_streams;i++) ++ if(s->streams[i]->nb_index_entries) ++ s->streams[i]->seek_table_flags |= AV_SEEKTABLE_FINISHED; ++ ++ if(st->start_time == AV_NOPTS_VALUE || (ret = av_seek_frame(s, stream_index, st->start_time, AVSEEK_FLAG_ANY) ) < 0 ) { ++ int data_offset = (s->data_offset < 0) || (s->data_offset >= s->file_size) ? 0 : s->data_offset; ++ ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: finished building index but error seeking: %i,trying url_fseek\n", ret); ++ ++ /* last ditch effort to seek using the file pointer. */ ++ if ((ret = url_fseek(s->pb, data_offset, SEEK_SET)) < 0) { ++ av_log(s,AV_LOG_DEBUG,"SEEK_TABLE_DEBUG: error seeking with url_fseek: %i\n", ret); ++ return ret; ++ } ++ } ++ } ++ av_log(s, AV_LOG_DEBUG, "SEEK_TABLE_DEBUG: finished building index\n"); ++ return 0; ++} ++ ++/** ++ * Save the flags, size, and differences for the index table ++ */ ++#define AV_SAVEINDEX_PACKETSIZE 1000 ++static int av_save_index_stream(ByteIOContext *bc, AVStream *st) { ++ AVIndexEntry start_ie; ++ AVIndexEntry *last_ie, *curr_ie; ++ int i; ++ ++ //we may need to save something like codec id to be safe. ++ ff_put_v(bc, st->seek_table_flags); ++ //we only write the index if we have a finished table. ++ if(st->seek_table_flags & AV_SEEKTABLE_FINISHED) { ++ ff_put_v(bc, st->nb_index_entries); ++ ++ memset(&start_ie, 0, sizeof(AVIndexEntry)); ++ last_ie = &start_ie; ++ for(i = 0; i < st->nb_index_entries; i++) { ++ curr_ie = &st->index_entries[i]; ++ ff_put_v(bc, curr_ie->pos - last_ie->pos); ++ ff_put_v(bc, curr_ie->timestamp - last_ie->timestamp); ++ ff_put_v(bc, curr_ie->flags - last_ie->flags); ++ ff_put_v(bc, curr_ie->size - last_ie->size); ++ ff_put_v(bc, curr_ie->min_distance - last_ie->min_distance); ++ last_ie = curr_ie; ++ if(i % AV_SAVEINDEX_PACKETSIZE == 0) ++ put_flush_packet(bc); ++ } ++ av_log(NULL, AV_LOG_DEBUG, "successfully wrote index stream with %i entries.\n", st->nb_index_entries); ++ } ++ put_flush_packet(bc); ++ ++ return 0; ++} ++ ++/** ++ * load the flags, size, and differences for the index table ++ */ ++static int av_load_index_stream(ByteIOContext *bc, AVStream *st) { ++ AVIndexEntry *ie, *last_ie; ++ uint64_t v; ++ ++ //check to see if we have a table saved in this stream. ++ v = ff_get_v(bc); ++ if(v & AV_SEEKTABLE_FINISHED) { ++ st->seek_table_flags = v; ++ st->nb_index_entries = v = ff_get_v(bc); ++ ++ //dump the old index and make the new one. ++ av_free(st->index_entries); ++ st->index_entries = av_malloc(v * sizeof(AVIndexEntry)); ++ ++ //the first index entry is not a diff, so it gets special treatment. ++ ie = st->index_entries; ++ if(v--) { ++ ie->pos = ff_get_v(bc); ++ ie->timestamp = ff_get_v(bc); ++ ie->flags = ff_get_v(bc); ++ ie->size = ff_get_v(bc); ++ ie->min_distance = ff_get_v(bc); ++ last_ie = ie; ++ ie++; ++ } ++ ++ while(v--) { ++ ie->pos = ff_get_v(bc) + last_ie->pos; ++ ie->timestamp = ff_get_v(bc) + last_ie->timestamp; ++ ie->flags = ff_get_v(bc) + last_ie->flags; ++ ie->size = ff_get_v(bc) + last_ie->size; ++ ie->min_distance = ff_get_v(bc) + last_ie->min_distance; ++ last_ie = ie; ++ ie++; ++ } ++ av_log(NULL, AV_LOG_DEBUG, "successfully loaded index stream with %i entries.\n", st->nb_index_entries); ++ } ++ return 0; ++} ++ ++/** ++ * Saves the table index built with av_build_index to a file. ++ * Returns 0 if successful, or a negative number if not. ++ * this is not mean to be human-readable ++ * we save the following things in order: ++ * - A strz "FFmpegTableIndex" (17 bytes) ++ * - The libavformat version number ++ * - The file name (null terminated) ++ * - the number of streams (4 bytes) ++ * - each of the streams' index tables via av_save_index_stream ++ */ ++#define AV_INDEX_IDENTIFIER "FFmpegTableIndex" ++#define AV_INDEX_NOFILENAME "nofilename" ++static int av_save_index(ByteIOContext *bc, AVFormatContext *ic) { ++ int i, ret; ++ ++ put_strz(bc, AV_INDEX_IDENTIFIER); ++ ff_put_v(bc, LIBAVFORMAT_VERSION_INT); ++ put_strz(bc, ic->filename?ic->filename:AV_INDEX_NOFILENAME); ++ ff_put_v(bc, ic->nb_streams); ++ for(i = 0; i< ic->nb_streams; i++) { ++ ret = av_save_index_stream(bc, ic->streams[i]); ++ if(ret < 0) ++ return ret; ++ } ++ put_flush_packet(bc); ++ av_log(ic, AV_LOG_DEBUG, "successfully wrote index.\n"); ++ return 0; ++} ++ ++static int av_load_index(ByteIOContext *bc, AVFormatContext *ic) { ++ int i, ret; ++ uint64_t v; ++ char read_str[256]; ++ ++ get_strz(bc, read_str, 255); ++ if( strcmp(read_str, AV_INDEX_IDENTIFIER) ) ++ return -1; ++ //version ++ v = ff_get_v(bc); ++ //make sure the filename matches the context we will write to. ++ get_strz(bc, read_str, 255); ++ if( strlen(read_str) < 255 && strcmp(read_str, ic->filename) && strcmp(read_str, AV_INDEX_NOFILENAME) ) ++ return -1; ++ ++ v = ff_get_v(bc); ++ if( v != ic->nb_streams) ++ return -1; ++ for(i =0; i<v; i++) { ++ ret = av_load_index_stream(bc, ic->streams[i]); ++ if(ret < 0) ++ return ret; ++ } ++ av_log(ic, AV_LOG_DEBUG, "successfully read index.\n"); ++ return 0; ++} ++ ++int av_save_index_file(AVFormatContext *ic, const char* filename) { ++ ByteIOContext* bc; ++ int i, ret, table_completed = 0; ++ ++ //do a first pass to see if we have any tables that need saving. ++ //only write the file if it exists. ++ for(i = 0; i< ic->nb_streams; i++) ++ table_completed |= ic->streams[i]->seek_table_flags & AV_SEEKTABLE_FINISHED; ++ if(!table_completed) ++ return -1; ++ ++ if ((ret=url_fopen(&bc, filename, URL_WRONLY)) < 0) { ++ return -1; ++ } ++ ret = av_save_index(bc, ic); ++ url_fclose(bc); ++ return ret; ++} ++ ++int av_load_index_file(AVFormatContext *ic, const char* filename) { ++ ByteIOContext* bc; ++ int ret; ++ ++ if ((ret=url_fopen(&bc, filename, URL_RDONLY)) < 0) { ++ return -1; ++ } ++ ret = av_load_index(bc, ic); ++ url_fclose(bc); ++ return ret; ++} + /*******************************************************/ + + /**