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chmap_sel: add channel replacement for sl/sr <-> sdl/sdr

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This can be use useful for the 7.1 rear layout. In particular it looks like
OS X likes to use sdl/sdr as opposed to sl/sr.
This commit is contained in:
Stefano Pigozzi 2014-05-08 21:45:04 +02:00
parent 26b00ffe8a
commit e7d1c12131
1 changed files with 21 additions and 16 deletions
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37
audio/chmap_sel.c
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@ -18,21 +18,21 @@
#include <stdlib.h>
#include <assert.h>
#include "common/common.h"
#include "chmap_sel.h"
// 5.1 and 5.1(side) are practically the same. It doesn't make much sense to
// reject either of them.
static const int replaceable_speakers[][2] = {
{MP_SPEAKER_ID_SL, MP_SPEAKER_ID_BL},
{MP_SPEAKER_ID_SR, MP_SPEAKER_ID_BR},
{-1},
static struct mp_chmap speaker_replacements[][2] = {
// 5.1 <-> 5.1 (side)
{ MP_CHMAP2(SL, SR), MP_CHMAP2(BL, BR) },
// 7.1 <-> 7.1 (rear ext)
{ MP_CHMAP2(SL, SR), MP_CHMAP2(SDL, SDR) },
};
// list[] contains a list of speaker pairs, with each pair indicating how
// a speaker can be swapped for another speaker. Try to replace speakers from
// the left of the list with the ones on the right, or the other way around.
static bool replace_speakers(struct mp_chmap *map, const int list[][2])
// Try to replace speakers from the left of the list with the ones on the
// right, or the other way around.
static bool replace_speakers(struct mp_chmap *map, struct mp_chmap list[2])
{
assert(list[0].num == list[1].num);
if (!mp_chmap_is_valid(map))
return false;
for (int dir = 0; dir < 2; dir++) {
@ -41,9 +41,9 @@ static bool replace_speakers(struct mp_chmap *map, const int list[][2])
bool replaced = false;
struct mp_chmap t = *map;
for (int n = 0; n < t.num; n++) {
for (int i = 0; list[i][0] != -1; i++) {
if (t.speaker[n] == list[i][from]) {
t.speaker[n] = list[i][to];
for (int i = 0; i < list[0].num; i++) {
if (t.speaker[n] == list[from].speaker[i]) {
t.speaker[n] = list[to].speaker[i];
replaced = true;
break;
}
@ -168,9 +168,14 @@ bool mp_chmap_sel_adjust(const struct mp_chmap_sel *s, struct mp_chmap *map)
return true;
}
}
// 5.1 <-> 5.1(side)
if (replace_speakers(map, replaceable_speakers) && test_layout(s, map))
return true;
for (int i = 0; i < MP_ARRAY_SIZE(speaker_replacements); i++) {
struct mp_chmap t = *map;
struct mp_chmap *r = speaker_replacements[i];
if (replace_speakers(&t, r) && test_layout(s, &t)) {
*map = t;
return true;
}
}
// Fallback to mono/stereo as last resort
if (map->num == 1) {
*map = (struct mp_chmap) MP_CHMAP_INIT_MONO;