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libswresample: introduce int swr_set_compensation() instead of void swr_compensate() 

The new version returns AVERROR(EINVAL) is the specified paramters are invalid,
and also creates the resampler if none was used so far.

Signed-off-by: Marton Balint <cus@passwd.hu>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Marton Balint 2012-01-09 01:42:38 +01:00 committed by Michael Niedermayer
parent 3e9668501d
commit 741aca7936
3 changed files with 23 additions and 7 deletions
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2
ffmpeg.c
View File

@ -1160,7 +1160,7 @@ need_realloc:
av_log(NULL, AV_LOG_VERBOSE, "compensating audio timestamp drift:%f compensation:%d in:%d\n",
delta, comp, enc->sample_rate);
// fprintf(stderr, "drift:%f len:%d opts:%"PRId64" ipts:%"PRId64" fifo:%d\n", delta, -1, ost->sync_opts, (int64_t)(get_sync_ipts(ost) * enc->sample_rate), av_fifo_size(ost->fifo)/(ost->st->codec->channels * 2));
swr_compensate(ost->swr, comp, enc->sample_rate);
swr_set_compensation(ost->swr, comp, enc->sample_rate);
}
}
} else

24
libswresample/resample.c
View File

@ -245,11 +245,27 @@ void swri_resample_free(ResampleContext **c){
av_freep(c);
}
void swr_compensate(struct SwrContext *s, int sample_delta, int compensation_distance){
ResampleContext *c= s->resample;
// sample_delta += (c->ideal_dst_incr - c->dst_incr)*(int64_t)c->compensation_distance / c->ideal_dst_incr;
int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance){
ResampleContext *c;
int ret;
if (!s || compensation_distance < 0)
return AVERROR(EINVAL);
if (!compensation_distance && sample_delta)
return AVERROR(EINVAL);
if (!s->resample) {
s->flags |= SWR_FLAG_RESAMPLE;
ret = swr_init(s);
if (ret < 0)
return ret;
}
c= s->resample;
c->compensation_distance= compensation_distance;
c->dst_incr = c->ideal_dst_incr - c->ideal_dst_incr * (int64_t)sample_delta / compensation_distance;
if (compensation_distance)
c->dst_incr = c->ideal_dst_incr - c->ideal_dst_incr * (int64_t)sample_delta / compensation_distance;
else
c->dst_incr = c->ideal_dst_incr;
return 0;
}
int swri_resample(ResampleContext *c, int16_t *dst, const int16_t *src, int *consumed, int src_size, int dst_size, int update_ctx){

4
libswresample/swresample.h
View File

@ -30,7 +30,7 @@
#include "libavutil/samplefmt.h"
#define LIBSWRESAMPLE_VERSION_MAJOR 0
#define LIBSWRESAMPLE_VERSION_MINOR 5
#define LIBSWRESAMPLE_VERSION_MINOR 6
#define LIBSWRESAMPLE_VERSION_MICRO 100
#define LIBSWRESAMPLE_VERSION_INT AV_VERSION_INT(LIBSWRESAMPLE_VERSION_MAJOR, \
@ -114,7 +114,7 @@ int swr_convert(struct SwrContext *s, uint8_t *out[SWR_CH_MAX], int out_count,
/**
* Activate resampling compensation.
*/
void swr_compensate(struct SwrContext *s, int sample_delta, int compensation_distance);
int swr_set_compensation(struct SwrContext *s, int sample_delta, int compensation_distance);
/**
* Set a customized input channel mapping.