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swr: add swr_drop_output() 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-05-19 18:42:11 +02:00
parent 7a59964ba9
commit f88f705abc
3 changed files with 38 additions and 1 deletions
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31
libswresample/swresample.c
View File

@ -596,6 +596,27 @@ int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_coun
AudioData * in= &s->in;
AudioData *out= &s->out;
if(s->drop_output > 0){
int ret;
AudioData tmp = s->out;
uint8_t *tmp_arg[SWR_CH_MAX];
tmp.count = 0;
tmp.data = NULL;
if((ret=realloc_audio(&tmp, s->drop_output))<0)
return ret;
reversefill_audiodata(&tmp, tmp_arg);
s->drop_output *= -1; //FIXME find a less hackish solution
ret = swr_convert(s, tmp_arg, -s->drop_output, in_arg, in_count); //FIXME optimize but this is as good as never called so maybe it doesnt matter
s->drop_output *= -1;
if(ret>0)
s->drop_output -= ret;
av_freep(&tmp.data);
if(s->drop_output || !out_arg)
return 0;
}
if(!in_arg){
if(s->in_buffer_count){
if (s->resample && !s->flushed) {
@ -676,6 +697,16 @@ int swr_convert(struct SwrContext *s, uint8_t *out_arg[SWR_CH_MAX], int out_coun
}
}
int swr_drop_output(struct SwrContext *s, int count){
s->drop_output += count;
if(s->drop_output <= 0)
return 0;
av_log(s, AV_LOG_VERBOSE, "discarding %d audio samples\n", count);
return swr_convert(s, NULL, s->drop_output, NULL, 0);
}
int swr_inject_silence(struct SwrContext *s, int count){
int ret, i;
AudioData silence = s->out;

7
libswresample/swresample.h
View File

@ -30,7 +30,7 @@
#include "libavutil/samplefmt.h"
#define LIBSWRESAMPLE_VERSION_MAJOR 0
#define LIBSWRESAMPLE_VERSION_MINOR 13
#define LIBSWRESAMPLE_VERSION_MINOR 14
#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);
/**
* Drops the specified number of output samples.
*/
int swr_drop_output(struct SwrContext *s, int count);
/**
* Injects the specified number of silence samples.
*/

1
libswresample/swresample_internal.h
View File

@ -77,6 +77,7 @@ struct SwrContext {
int in_buffer_count; ///< cached buffer length
int resample_in_constraint; ///< 1 if the input end was reach before the output end, 0 otherwise
int flushed; ///< 1 if data is to be flushed and no further input is expected
int drop_output; ///< number of output samples to drop
struct AudioConvert *in_convert; ///< input conversion context
struct AudioConvert *out_convert; ///< output conversion context