[FFmpeg-devel] [PATCH 1/2] audioconvert: make av_get_channel_layout accept composite names.
Nicolas George
nicolas.george at normalesup.org
Tue Nov 8 16:32:50 CET 2011
Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
---
libavutil/audioconvert.c | 47 +++++++++++++++++++++++++++++++++++++--------
libavutil/audioconvert.h | 12 +++++++++++
2 files changed, 50 insertions(+), 9 deletions(-)
diff --git a/libavutil/audioconvert.c b/libavutil/audioconvert.c
index 0bcc9b7..30f6074 100644
--- a/libavutil/audioconvert.c
+++ b/libavutil/audioconvert.c
@@ -72,23 +72,52 @@ 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 }
};
-int64_t av_get_channel_layout(const char *name)
+static int64_t get_channel_layout_single(const char *name, int name_len)
{
- 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);
+ 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)
+{
+ const char *n, *e;
+ const char *name_end = name + strlen(name);
+ int64_t layout = 0, layout_single;
+
+ 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,
int nb_channels, int64_t channel_layout)
{
diff --git a/libavutil/audioconvert.h b/libavutil/audioconvert.h
index 8cef7f6..4e0e98c 100644
--- a/libavutil/audioconvert.h
+++ b/libavutil/audioconvert.h
@@ -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);
--
1.7.7.1
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