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swr: introduce a public function to customize the channel mapping.

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This commit is contained in:
Clément Bœsch 2011-11-17 15:06:35 +01:00
parent d3baced24f
commit eafa2b6005
5 changed files with 25 additions and 11 deletions
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3
ffmpeg.c
View File

@ -894,8 +894,9 @@ need_realloc:
ost->swr = swr_alloc_set_opts(ost->swr,
enc->channel_layout, enc->sample_fmt, enc->sample_rate,
dec->channel_layout, dec->sample_fmt, dec->sample_rate,
ost->audio_channels_mapped ? ost->audio_channels_map : NULL,
0, NULL);
if (ost->audio_channels_mapped)
swr_set_channel_mapping(ost->swr, ost->audio_channels_map);
av_opt_set_double(ost->swr, "rmvol", ost->rematrix_volume, 0);
if (ost->audio_channels_mapped) {
av_opt_set_int(ost->swr, "icl", av_get_default_channel_layout(ost->audio_channels_mapped), 0);

2
ffplay.c
View File

@ -2079,7 +2079,7 @@ static int audio_decode_frame(VideoState *is, double *pts_ptr)
is->swr_ctx = swr_alloc_set_opts(NULL,
is->audio_tgt_channel_layout, is->audio_tgt_fmt, is->audio_tgt_freq,
dec_channel_layout, dec->sample_fmt, dec->sample_rate,
NULL, 0, NULL);
0, NULL);
if (!is->swr_ctx || swr_init(is->swr_ctx) < 0) {
fprintf(stderr, "Cannot create sample rate converter for conversion of %d Hz %s %d channels to %d Hz %s %d channels!\n",
dec->sample_rate,

11
libswresample/swresample.c
View File

@ -73,6 +73,13 @@ static const AVClass av_class = {
static int resample(SwrContext *s, AudioData *out_param, int out_count,
const AudioData * in_param, int in_count);
int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map){
if(!s || s->in_convert) // s needs to be allocated but not initialized
return AVERROR(EINVAL);
s->channel_map = channel_map;
return 0;
}
struct SwrContext *swr_alloc(void){
SwrContext *s= av_mallocz(sizeof(SwrContext));
if(s){
@ -85,7 +92,7 @@ struct SwrContext *swr_alloc(void){
struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate,
const int *channel_map, int log_offset, void *log_ctx){
int log_offset, void *log_ctx){
if(!s) s= swr_alloc();
if(!s) return NULL;
@ -101,8 +108,6 @@ struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
av_opt_set_int(s, "tsf", AV_SAMPLE_FMT_S16, 0);
av_opt_set_int(s, "ich", av_get_channel_layout_nb_channels(s-> in_ch_layout), 0);
av_opt_set_int(s, "och", av_get_channel_layout_nb_channels(s->out_ch_layout), 0);
s->channel_map = channel_map;
return s;
}

16
libswresample/swresample.h
View File

@ -30,7 +30,7 @@
#include "libavutil/samplefmt.h"
#define LIBSWRESAMPLE_VERSION_MAJOR 0
#define LIBSWRESAMPLE_VERSION_MINOR 3
#define LIBSWRESAMPLE_VERSION_MINOR 4
#define LIBSWRESAMPLE_VERSION_MICRO 0
#define SWR_CH_MAX 16 ///< Maximum number of channels
@ -74,8 +74,6 @@ int swr_init(struct SwrContext *s);
* @param in_ch_layout input channel layout (AV_CH_LAYOUT_*)
* @param in_sample_fmt input sample format (AV_SAMPLE_FMT_*). Use +0x100 for planar audio
* @param in_sample_rate input sample rate (frequency in Hz)
* @param channel_map customized input channel mapping (array of channel
* indexes, -1 for a muted channel), can be NULL
* @param log_offset logging level offset
* @param log_ctx parent logging context, can be NULL
*
@ -85,7 +83,7 @@ int swr_init(struct SwrContext *s);
struct SwrContext *swr_alloc_set_opts(struct SwrContext *s,
int64_t out_ch_layout, enum AVSampleFormat out_sample_fmt, int out_sample_rate,
int64_t in_ch_layout, enum AVSampleFormat in_sample_fmt, int in_sample_rate,
const int *channel_map, int log_offset, void *log_ctx);
int log_offset, void *log_ctx);
/**
* Free the given SwrContext and set the pointer to NULL.
@ -114,4 +112,14 @@ int swr_convert(struct SwrContext *s, uint8_t *out[SWR_CH_MAX], int out_count,
*/
void swr_compensate(struct SwrContext *s, int sample_delta, int compensation_distance);
/**
* Set a customized input channel mapping.
*
* @param s allocated Swr context, not yet initialized
* @param channel_map customized input channel mapping (array of channel
* indexes, -1 for a muted channel)
* @return AVERROR error code in case of failure.
*/
int swr_set_channel_mapping(struct SwrContext *s, const int *channel_map);
#endif

4
libswresample/swresample_test.c
View File

@ -132,10 +132,10 @@ int main(int argc, char **argv){
av_get_sample_fmt_name(in_sample_fmt), av_get_sample_fmt_name(out_sample_fmt));
forw_ctx = swr_alloc_set_opts(forw_ctx, out_ch_layout, out_sample_fmt+planar_out, out_sample_rate,
in_ch_layout, in_sample_fmt+planar_in , in_sample_rate,
NULL, 0, 0);
0, 0);
backw_ctx = swr_alloc_set_opts(backw_ctx, in_ch_layout, in_sample_fmt, in_sample_rate,
out_ch_layout, out_sample_fmt+planar_out, out_sample_rate,
NULL, 0, 0);
0, 0);
if(swr_init( forw_ctx) < 0)
fprintf(stderr, "swr_init(->) failed\n");
if(swr_init(backw_ctx) < 0)