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Add seek support to transcode

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This commit is contained in:
Julien BLACHE 2010-04-04 12:34:28 +02:00
parent 9fb7ec8e5c
commit 17daace67f
2 changed files with 78 additions and 0 deletions
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75
src/transcode.c
View File

@ -245,6 +245,81 @@ transcode(struct transcode_ctx *ctx, struct evbuffer *evbuf, int wanted)
return processed;
}
int
transcode_seek(struct transcode_ctx *ctx, int ms)
{
int64_t start_time;
int64_t target_pts;
int64_t got_pts;
int got_ms;
int flags;
int ret;
target_pts = ms * AV_TIME_BASE / 1000;
target_pts = av_rescale_q(target_pts, AV_TIME_BASE_Q, ctx->fmtctx->streams[ctx->astream]->time_base);
start_time = ctx->fmtctx->streams[ctx->astream]->start_time;
if ((start_time != AV_NOPTS_VALUE) && (start_time > 0))
target_pts += start_time;
ret = av_seek_frame(ctx->fmtctx, ctx->astream, target_pts, AVSEEK_FLAG_BACKWARD);
if (ret < 0)
{
DPRINTF(E_WARN, L_XCODE, "Could not seek into stream: %s\n", strerror(AVUNERROR(ret)));
return -1;
}
avcodec_flush_buffers(ctx->acodec);
ctx->acodec->hurry_up = 1;
flags = 0;
while (1)
{
if (ctx->apacket.data)
av_free_packet(&ctx->apacket);
ret = av_read_frame(ctx->fmtctx, &ctx->apacket);
if (ret < 0)
{
DPRINTF(E_WARN, L_XCODE, "Could not read more data while seeking\n");
flags = 1;
break;
}
if (ctx->apacket.stream_index != ctx->astream)
continue;
/* Need a pts to return the real position */
if (ctx->apacket.pts == AV_NOPTS_VALUE)
continue;
break;
}
/* Error while reading frame above */
if (flags)
return -1;
/* Copy apacket data & size and do not mess with them */
ctx->apacket_data = ctx->apacket.data;
ctx->apacket_size = ctx->apacket.size;
/* Compute position in ms from pts */
if ((start_time != AV_NOPTS_VALUE) && (start_time > 0))
got_pts -= start_time;
got_pts = av_rescale_q(ctx->apacket.pts, ctx->fmtctx->streams[ctx->astream]->time_base, AV_TIME_BASE_Q);
got_ms = got_pts / (AV_TIME_BASE / 1000);
DPRINTF(E_DBG, L_XCODE, "Seek wanted %d ms, got %d ms\n", ms, got_ms);
return got_ms;
}
struct transcode_ctx *
transcode_setup(struct media_file_info *mfi, off_t *est_size, int wavhdr)
{

3
src/transcode.h
View File

@ -9,6 +9,9 @@ struct transcode_ctx;
int
transcode(struct transcode_ctx *ctx, struct evbuffer *evbuf, int wanted);
int
transcode_seek(struct transcode_ctx *ctx, int ms);
struct transcode_ctx *
transcode_setup(struct media_file_info *mfi, off_t *est_size, int wavhdr);