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user specifyable maximum amount of memory to use for the index.

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patch by Paul Kelly  paul stjohnspoint co uk
with some changes by me

Originally committed as revision 11521 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Paul Kelly 2008-01-13 13:33:37 +00:00 committed by Michael Niedermayer
parent 3ed546fe52
commit 3dea63bd7e
3 changed files with 39 additions and 2 deletions
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25
libavformat/avformat.h
View File

@ -21,8 +21,8 @@
#ifndef FFMPEG_AVFORMAT_H
#define FFMPEG_AVFORMAT_H
#define LIBAVFORMAT_VERSION_INT ((52<<16)+(3<<8)+0)
#define LIBAVFORMAT_VERSION 52.3.0
#define LIBAVFORMAT_VERSION_INT ((52<<16)+(4<<8)+0)
#define LIBAVFORMAT_VERSION 52.4.0
#define LIBAVFORMAT_BUILD LIBAVFORMAT_VERSION_INT
#define LIBAVFORMAT_IDENT "Lavf" AV_STRINGIFY(LIBAVFORMAT_VERSION)
@ -477,6 +477,18 @@ typedef struct AVFormatContext {
* demuxing: set by user
*/
enum CodecID subtitle_codec_id;
/**
* Maximum amount of memory in bytes to use per stream for the index.
* If the needed index exceeds this size entries will be discarded as
* needed to maintain a smaller size. This can lead to slower or less
* accurate seeking (depends on demuxer).
* Demuxers for which a full in memory index is mandatory will ignore
* this.
* muxing : unused
* demuxing: set by user
*/
unsigned int max_index_size;
} AVFormatContext;
typedef struct AVPacketList {
@ -735,6 +747,15 @@ int av_find_default_stream_index(AVFormatContext *s);
*/
int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
/**
* Ensures the index uses less memory than the maximum specified in
* AVFormatContext.max_index_size, by discarding entries if it grows
* too large.
* This function is not part of the public API and should only be called
* by demuxers.
*/
void ff_reduce_index(AVFormatContext *s, int stream_index);
/**
* Add a index entry into a sorted list updateing if it is already there.
*

1
libavformat/mpeg.c
View File

@ -386,6 +386,7 @@ static int mpegps_read_pes_header(AVFormatContext *s,
int i;
for(i=0; i<s->nb_streams; i++){
if(startcode == s->streams[i]->id) {
ff_reduce_index(s, i);
av_add_index_entry(s->streams[i], *ppos, dts, 0, 0, AVINDEX_KEYFRAME /* FIXME keyframe? */);
}
}

15
libavformat/utils.c
View File

@ -324,6 +324,7 @@ static const AVOption options[]={
{"year", "set the year", OFFSET(year), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, E},
{"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, 3*AV_TIME_BASE, 0, INT_MAX, D},
{"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, 0, 0, 0, D},
{"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, INT_MAX, 0, INT_MAX, D},
{NULL},
};
@ -791,6 +792,7 @@ static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt)
compute_pkt_fields(s, st, st->parser, pkt);
if((s->iformat->flags & AVFMT_GENERIC_INDEX) && pkt->flags & PKT_FLAG_KEY){
ff_reduce_index(s, st->index);
av_add_index_entry(st, st->parser->frame_offset, pkt->dts,
0, 0, AVINDEX_KEYFRAME);
}
@ -1008,6 +1010,19 @@ void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp){
}
}
void ff_reduce_index(AVFormatContext *s, int stream_index)
{
AVStream *st= s->streams[stream_index];
unsigned int max_entries= s->max_index_size / sizeof(AVIndexEntry);
if((unsigned)st->nb_index_entries >= max_entries){
int i;
for(i=0; 2*i<st->nb_index_entries; i++)
st->index_entries[i]= st->index_entries[2*i];
st->nb_index_entries= i;
}
}
int av_add_index_entry(AVStream *st,
int64_t pos, int64_t timestamp, int size, int distance, int flags)
{