#include "audioconvert.h"
static const char * const channel_names[] = {
- "FL", "FR", "FC", "LFE", "BL", "BR", "FLC", "FRC",
- "BC", "SL", "SR", "TC", "TFL", "TFC", "TFR", "TBL",
- "TBC", "TBR",
- [29] = "DL",
- [30] = "DR",
+ [0] = "FL", /* front left */
+ [1] = "FR", /* front right */
+ [2] = "FC", /* front center */
+ [3] = "LFE", /* low frequency */
+ [4] = "BL", /* back left */
+ [5] = "BR", /* back right */
+ [6] = "FLC", /* front left-of-center */
+ [7] = "FRC", /* front right-of-center */
+ [8] = "BC", /* back-center */
+ [9] = "SL", /* side left */
+ [10] = "SR", /* side right */
+ [11] = "TC", /* top center */
+ [12] = "TFL", /* top front left */
+ [13] = "TFC", /* top front center */
+ [14] = "TFR", /* top front right */
+ [15] = "TBL", /* top back left */
+ [16] = "TBC", /* top back center */
+ [17] = "TBR", /* top back right */
+ [29] = "DL", /* downmix left */
+ [30] = "DR", /* downmix right */
};
static const char *get_channel_name(int channel_id)
{ "stereo", 2, AV_CH_LAYOUT_STEREO },
{ "4.0", 4, AV_CH_LAYOUT_4POINT0 },
{ "quad", 4, AV_CH_LAYOUT_QUAD },
- { "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 },
{ "5.0", 5, AV_CH_LAYOUT_5POINT0_BACK },
- { "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 },
+ { "5.0(side)", 5, AV_CH_LAYOUT_5POINT0 },
{ "5.1", 6, AV_CH_LAYOUT_5POINT1_BACK },
- { "5.1+downmix", 8, AV_CH_LAYOUT_5POINT1|AV_CH_LAYOUT_STEREO_DOWNMIX, },
+ { "5.1(side)", 6, AV_CH_LAYOUT_5POINT1 },
{ "7.1", 8, AV_CH_LAYOUT_7POINT1 },
{ "7.1(wide)", 8, AV_CH_LAYOUT_7POINT1_WIDE },
- { "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)
{
snprintf(buf, buf_size, "%d channels", nb_channels);
if (channel_layout) {
- int i,ch;
+ int i, ch;
av_strlcat(buf, " (", buf_size);
- for(i=0,ch=0; i<64; i++) {
- if ((channel_layout & (1L<<i))) {
+ for (i = 0, ch = 0; i < 64; i++) {
+ if ((channel_layout & (1L << i))) {
const char *name = get_channel_name(i);
if (name) {
- if (ch>0) av_strlcat(buf, "|", buf_size);
+ if (ch > 0)
+ av_strlcat(buf, "+", buf_size);
av_strlcat(buf, name, buf_size);
}
ch++;
x &= x-1; // unset lowest set bit
return count;
}
+
+int64_t av_get_default_channel_layout(int nb_channels) {
+ int i;
+ for (i = 0; channel_layout_map[i].name; i++)
+ if (nb_channels == channel_layout_map[i].nb_channels)
+ return channel_layout_map[i].layout;
+ return 0;
+}