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audioconvert: implement av_bprint_channel_layout().

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And reimplement av_get_channel_layout_string() on top of it.
This commit is contained in:
Nicolas George 2012-06-03 21:09:16 +02:00
parent 7a2b429175
commit e45a92dc88
2 changed files with 24 additions and 8 deletions
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26
libavutil/audioconvert.c
View File

@ -26,6 +26,7 @@
#include "avstring.h"
#include "avutil.h"
#include "audioconvert.h"
#include "bprint.h"
static const char * const channel_names[] = {
[0] = "FL", /* front left */
@ -136,8 +137,8 @@ uint64_t av_get_channel_layout(const char *name)
return layout;
}
void av_get_channel_layout_string(char *buf, int buf_size,
int nb_channels, uint64_t channel_layout)
void av_bprint_channel_layout(struct AVBPrint *bp,
int nb_channels, uint64_t channel_layout)
{
int i;
@ -147,29 +148,38 @@ void av_get_channel_layout_string(char *buf, int buf_size,
for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map); i++)
if (nb_channels == channel_layout_map[i].nb_channels &&
channel_layout == channel_layout_map[i].layout) {
av_strlcpy(buf, channel_layout_map[i].name, buf_size);
av_bprintf(bp, "%s", channel_layout_map[i].name);
return;
}
snprintf(buf, buf_size, "%d channels", nb_channels);
av_bprintf(bp, "%d channels", nb_channels);
if (channel_layout) {
int i, ch;
av_strlcat(buf, " (", buf_size);
av_bprintf(bp, " (");
for (i = 0, ch = 0; i < 64; i++) {
if ((channel_layout & (UINT64_C(1) << i))) {
const char *name = get_channel_name(i);
if (name) {
if (ch > 0)
av_strlcat(buf, "+", buf_size);
av_strlcat(buf, name, buf_size);
av_bprintf(bp, "+");
av_bprintf(bp, "%s", name);
}
ch++;
}
}
av_strlcat(buf, ")", buf_size);
av_bprintf(bp, ")");
}
}
void av_get_channel_layout_string(char *buf, int buf_size,
int nb_channels, uint64_t channel_layout)
{
AVBPrint bp;
av_bprint_init_for_buffer(&bp, buf, buf_size);
av_bprint_channel_layout(&bp, nb_channels, channel_layout);
}
int av_get_channel_layout_nb_channels(uint64_t channel_layout)
{
int count;

6
libavutil/audioconvert.h
View File

@ -133,6 +133,12 @@ uint64_t av_get_channel_layout(const char *name);
*/
void av_get_channel_layout_string(char *buf, int buf_size, int nb_channels, uint64_t channel_layout);
struct AVBPrint;
/**
* Append a description of a channel layout to a bprint buffer.
*/
void av_bprint_channel_layout(struct AVBPrint *bp, int nb_channels, uint64_t channel_layout);
/**
* Return the number of channels in the channel layout.
*/