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;
++}
+ /*******************************************************/
+
+ /**
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