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swr: add swr_inject_silence() 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-05-19 18:39:12 +02:00
parent 72872d0201
commit 7a59964ba9
2 changed files with 30 additions and 1 deletions
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24
libswresample/swresample.c
View File

@ -676,3 +676,27 @@ int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_coun
}
}
int swr_inject_silence(struct SwrContext *s, int count){
int ret, i;
AudioData silence = s->out;
uint8_t *tmp_arg[SWR_CH_MAX];
if(count <= 0)
return 0;
silence.count = 0;
silence.data = NULL;
if((ret=realloc_audio(&silence, count))<0)
return ret;
if(silence.planar) for(i=0; i<silence.ch_count; i++) {
memset(silence.ch[i], silence.bps==1 ? 0x80 : 0, count*silence.bps);
} else
memset(silence.ch[0], silence.bps==1 ? 0x80 : 0, count*silence.bps*silence.ch_count);
reversefill_audiodata(&silence, tmp_arg);
av_log(s, AV_LOG_VERBOSE, "adding %d audio samples of silence\n", count);
ret = swr_convert(s, NULL, 0, (const uint8_t**)tmp_arg, count);
av_freep(&silence.data);
return ret;
}

7
libswresample/swresample.h
View File

@ -30,7 +30,7 @@
#include "libavutil/samplefmt.h"
#define LIBSWRESAMPLE_VERSION_MAJOR 0
#define LIBSWRESAMPLE_VERSION_MINOR 12
#define LIBSWRESAMPLE_VERSION_MINOR 13
#define LIBSWRESAMPLE_VERSION_MICRO 100
#define LIBSWRESAMPLE_VERSION_INT AV_VERSION_INT(LIBSWRESAMPLE_VERSION_MAJOR, \
@ -158,6 +158,11 @@ int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map);
*/
int swr_set_matrix(struct SwrContext *s, const double *matrix, int stride);
/**
* Injects the specified number of silence samples.
*/
int swr_inject_silence(struct SwrContext *s, int count);
/**
* Gets the delay the next input sample will experience relative to the next output sample.
*