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audioconvert: make av_get_channel_layout accept composite names.

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Signed-off-by: Nicolas George <nicolas.george@normalesup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Nicolas George 2011-11-08 16:32:50 +01:00 committed by Michael Niedermayer
parent 8cd210700b
commit e7062a1e9f
3 changed files with 51 additions and 10 deletions
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47
libavutil/audioconvert.c
View File

@ -72,21 +72,50 @@ static const struct {
{ "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 },
{ "7.1", 8, AV_CH_LAYOUT_7POINT1 },
{ "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE },
{ "5.1+downmix", 8, AV_CH_LAYOUT_5POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, },
{ "7.1+downmix", 10, AV_CH_LAYOUT_7POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, },
{ "downmix", 2, AV_CH_LAYOUT_STEREO_DOWNMIX, },
{ 0 }
};
static int64_t get_channel_layout_single(const char *name, int name_len)
{
int i;
char *end;
int64_t layout;
for (i = 0; i < FF_ARRAY_ELEMS(channel_layout_map) - 1; i++) {
if (strlen(channel_layout_map[i].name) == name_len &&
!memcmp(channel_layout_map[i].name, name, name_len))
return channel_layout_map[i].layout;
}
for (i = 0; i < FF_ARRAY_ELEMS(channel_names); i++)
if (channel_names[i] &&
strlen(channel_names[i]) == name_len &&
!memcmp(channel_names[i], name, name_len))
return (int64_t)1 << i;
i = strtol(name, &end, 10);
if (end - name == name_len ||
(end + 1 - name == name_len && *end == 'c'))
return av_get_default_channel_layout(i);
layout = strtoll(name, &end, 0);
if (end - name == name_len)
return FFMAX(layout, 0);
return 0;
}
int64_t av_get_channel_layout(const char *name)
{
int i = 0;
do {
if (!strcmp(channel_layout_map[i].name, name))
return channel_layout_map[i].layout;
i++;
} while (channel_layout_map[i].name);
const char *n, *e;
const char *name_end = name + strlen(name);
int64_t layout = 0, layout_single;
return 0;
for (n = name; n < name_end; n = e + 1) {
for (e = n; e < name_end && *e != '+' && *e != '|'; e++);
layout_single = get_channel_layout_single(n, e - n);
if (!layout_single)
return 0;
layout |= layout_single;
}
return layout;
}
void av_get_channel_layout_string(char *buf, int buf_size,

12
libavutil/audioconvert.h
View File

@ -75,6 +75,18 @@
/**
* Return a channel layout id that matches name, 0 if no match.
* name can be one or several of the following notations,
* separated by '+' or '|':
* - the name of an usual channel layout (mono, stereo, 4.0, quad, 5.0,
* 5.0(side), 5.1, 5.1(side), 7.1, 7.1(wide), downmix);
* - the name of a single channel (FL, FR, FC, LFE, BL, BR, FLC, FRC, BC,
* SL, SR, TC, TFL, TFC, TFR, TBL, TBC, TBR, DL, DR);
* - a number of channels, in decimal, optionnally followed by 'c', yielding
* the default channel layout for that number of channels (@see
* av_get_default_channel_layout);
* - a channel layout mask, in hexadecimal starting with "0x" (see the
* AV_CH_* macros).
+ Example: "stereo+FC" = "2+FC" = "2c+1c" = "0x7"
*/
int64_t av_get_channel_layout(const char *name);

2
libavutil/avutil.h
View File

@ -41,7 +41,7 @@
#define LIBAVUTIL_VERSION_MAJOR 51
#define LIBAVUTIL_VERSION_MINOR 24
#define LIBAVUTIL_VERSION_MICRO 0
#define LIBAVUTIL_VERSION_MICRO 1
#define LIBAVUTIL_VERSION_INT AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
LIBAVUTIL_VERSION_MINOR, \