At Sun, 10 Nov 2013 20:29:17 +0200, Anssi Hannula wrote:
The channel selection currently does not work properly when there is a driver-provided non-ALSA-traditional channel map but no manual channel map was explicitely requested with "-m".
For example, the CEA/HDMI 8ch map is FL,FR,RLC,RRC,FC,LFE,RL,RR. Note that it is otherwise the same as the traditional ALSA channel map, except that the traditional rear speakers are considered rear-center speakers and the traditional side speakers are considered rear speakers.
Speaker-test tries to play back channels in this following order: 0, /* Front Left */ 4, /* Center */ 1, /* Front Right */ 7, /* Side Right */ 3, /* Rear Right */ 2, /* Rear Left */ 6, /* Side Left */ 5, /* LFE */
When it is the time to play back Side Left/Right, speaker-test tries to look for SL/SR in the chmap, but doesn't find it, so it just plays back channels 6/7 (which indeed are the side speakers, or RL/RR in this channel map - so the correct channels are selected).
When it becomes the time to playback Rear Left/Right, speaker-test again tries to find RL/RR in the chmap, and this time it does find them in the chmap positions 6/7.
So the channels 6/7 are tested twice and 2/3 are never tested.
To fix this, define a generic playback order to be used when a channel map is present and assign the speaker numbers (i.e. playback order) in the following order:
- channels in map found in map_order[] in the map_order[] order,
- channels in map not found in map_order[] in map order,
- channels outside the map.
You are referring to the teaching of Zen, aren't you...? ;)
I prefer something a bit more easier to understand. For example, how about to sort the given channels once using a weight table?
thanks,
Takashi
When the channel mapping is specified manually, the specified order is used for playback as before.
Signed-off-by: Anssi Hannula anssi.hannula@iki.fi
speaker-test/speaker-test.c | 86 +++++++++++++++++++++++++++++++++++---------- 1 file changed, 67 insertions(+), 19 deletions(-)
diff --git a/speaker-test/speaker-test.c b/speaker-test/speaker-test.c index d35065f..274007d 100644 --- a/speaker-test/speaker-test.c +++ b/speaker-test/speaker-test.c @@ -88,6 +88,8 @@ enum { #define BE_INT(v) (v) #endif
+#define ARRAY_SIZE(x) (int)(sizeof(x)/sizeof(x[0]))
static char *device = "default"; /* playback device */ static snd_pcm_format_t format = SND_PCM_FORMAT_S16; /* sample format */ static unsigned int rate = 48000; /* stream rate */ @@ -156,36 +158,82 @@ static const int channels8[] = { 5, /* LFE */ };
+#ifdef CONFIG_SUPPORT_CHMAP +/* generic version of the above channelsX[] */ +static const int map_order[] = {
- SND_CHMAP_FLW,
- SND_CHMAP_FL,
- SND_CHMAP_TFL,
- SND_CHMAP_FLC,
- SND_CHMAP_TFLC,
- SND_CHMAP_FC,
- SND_CHMAP_TFC,
- SND_CHMAP_FRC,
- SND_CHMAP_TFRC,
- SND_CHMAP_FR,
- SND_CHMAP_TFR,
- SND_CHMAP_FRW,
- SND_CHMAP_SR,
- SND_CHMAP_TSR,
- SND_CHMAP_RR,
- SND_CHMAP_TRR,
- SND_CHMAP_RRC,
- SND_CHMAP_RC,
- SND_CHMAP_TRC,
- SND_CHMAP_RLC,
- SND_CHMAP_RL,
- SND_CHMAP_TRL,
- SND_CHMAP_SL,
- SND_CHMAP_TSL,
- SND_CHMAP_BC,
- SND_CHMAP_TC,
- SND_CHMAP_LLFE,
- SND_CHMAP_LFE,
- SND_CHMAP_RLFE,
+};
static int get_mapped_channel(int chn) { -#ifdef CONFIG_SUPPORT_CHMAP
- static const int maps[MAX_CHANNELS] = {
- SND_CHMAP_FL,
- SND_CHMAP_FR,
- SND_CHMAP_RL,
- SND_CHMAP_RR,
- SND_CHMAP_FC,
- SND_CHMAP_LFE,
- SND_CHMAP_SL,
- SND_CHMAP_SR,
- };
- int found_count = 0;
- int i, j;
- if (chn >= channel_map->channels)
- return chn; /* out of map */
- if (channel_map && maps[chn]) {
- int i;
- for (i = 0; i < channel_map->channels; i++) {
if (channel_map->pos[i] == maps[chn])- return i;
- for (i = 0; i < ARRAY_SIZE(map_order) && found_count <= chn; i++) {
- for (j = 0; j < channel_map->channels; j++) {
if (channel_map->pos[j] == map_order[i]) {found_count++;- break;
}-#endif
- return chn;
- if (found_count == chn + 1)
- return j;
- /* chn is bigger than the amount of present map_order[] channels, find
- the non-map_order[] channels */
- for (j = 0; j < channel_map->channels && found_count <= chn; j++) {
- for (i = 0; i < ARRAY_SIZE(map_order); i++) {
if (channel_map->pos[j] == map_order[i])break;- }
- if (i == ARRAY_SIZE(map_order))
found_count++;- }
- return j - 1;
} +#endif
static int get_speaker_channel(int chn) { #ifdef CONFIG_SUPPORT_CHMAP if (channel_map_set) return chn;
- if (channel_map)
- return get_mapped_channel(chn);
#endif
switch (channels) { @@ -200,7 +248,7 @@ static int get_speaker_channel(int chn) break; }
- return get_mapped_channel(chn);
- return chn;
}
static const char *get_channel_name(int chn)
1.8.1.5