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Code Issues Releases Activity

Decode previous 32 frames to avoid seeking artifacts in MPC

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Originally committed as revision 7393 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov
2007-01-01 05:32:27 +00:00
parent 0587b0cacd
commit aac88b534c
2 changed files with 19 additions and 1 deletions
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libavformat/mpc.c
+4 -1
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@@ -22,6 +22,7 @@
#include "bitstream.h"
#define MPC_FRAMESIZE 1152
#define DELAY_FRAMES 32
static const int mpc_rate[4] = { 44100, 48000, 37800, 32000 };
typedef struct {
@@ -155,6 +156,7 @@ static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
pkt->data[1] = (c->curframe > c->fcount);
pkt->stream_index = 0;
pkt->pts = cur;
ret = get_buffer(&s->pb, pkt->data + 4, size);
if(c->curbits)
url_fseek(&s->pb, -4, SEEK_CUR);
@@ -188,7 +190,7 @@ static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp
MPCContext *c = s->priv_data;
AVPacket pkt1, *pkt = &pkt1;
int ret;
int index = av_index_search_timestamp(st, timestamp, flags);
int index = av_index_search_timestamp(st, timestamp - DELAY_FRAMES, flags);
uint32_t lastframe;
/* if found, seek there */
@@ -199,6 +201,7 @@ static int mpc_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp
/* if timestamp is out of bounds, return error */
if(timestamp < 0 || timestamp >= c->fcount)
return -1;
timestamp -= DELAY_FRAMES;
/* seek to the furthest known position and read packets until
we reach desired position */
lastframe = c->curframe;