[alsa-plugins] [PATCH 1/1] Allow number of channels

[alsa-plugins] [PATCH 1/1] Allow number of channels

[Corfu, ValentinX]

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From f80d5665fdc1c5c42f2616eacbe548c1d0e7aba6 Mon Sep 17 00:00:00 2001
From: Valentin Corfu <valentinx.corfu@intel.com>
Date: Fri, 28 Feb 2014 10:29:01 -0500
Subject: [PATCH] Allow number of channels

The modification allows to specify the number of channels as parameters
in the configuration file. The given number of channels are then created
but not connected

Signed-off-by: Valentin Corfu <valentinx.corfu@intel.com>

diff --git a/jack/pcm_jack.c b/jack/pcm_jack.c
index 4213708..059c60d 100644
--- a/jack/pcm_jack.c
+++ b/jack/pcm_jack.c
@@ -325,7 +325,7 @@ static int make_nonblock(int fd)
 static int snd_pcm_jack_open(snd_pcm_t **pcmp, const char *name,
 			     snd_config_t *playback_conf,
 			     snd_config_t *capture_conf,
-			     snd_pcm_stream_t stream, int mode)
+			     snd_pcm_stream_t stream, int mode, unsigned int num_channels)
 {
 	snd_pcm_jack_t *jack;
 	int err;
@@ -341,11 +341,21 @@ static int snd_pcm_jack_open(snd_pcm_t **pcmp, const char *name,
 	jack->fd = -1;
 	jack->io.poll_fd = -1;
 
-	err = parse_ports(jack, stream == SND_PCM_STREAM_PLAYBACK ?
-			  playback_conf : capture_conf);
-	if (err) {
-		snd_pcm_jack_free(jack);
-		return err;
+	if (num_channels > 0) {
+		jack->num_ports = num_channels;
+		jack->port_names = calloc(num_channels, sizeof(char*));
+		if (jack->port_names == NULL) {
+			snd_pcm_jack_free(jack);
+			return -ENOMEM;
+		}
+	}
+	else {
+		err = parse_ports(jack, stream == SND_PCM_STREAM_PLAYBACK ?
+				playback_conf : capture_conf);
+		if (err) {
+			snd_pcm_jack_free(jack);
+			return err;
+		}
 	}
 
 	jack->channels = jack->num_ports;
@@ -422,6 +432,7 @@ SND_PCM_PLUGIN_DEFINE_FUNC(jack)
 	snd_config_t *playback_conf = NULL;
 	snd_config_t *capture_conf = NULL;
 	int err;
+	unsigned int num_channels = 0;
 	
 	snd_config_for_each(i, next, conf) {
 		snd_config_t *n = snd_config_iterator_entry(i);
@@ -434,6 +445,10 @@ SND_PCM_PLUGIN_DEFINE_FUNC(jack)
 			snd_config_get_string(n, &name);
 			continue;
 		}
+		if (strcmp(id, "channels") == 0) {
+			snd_config_get_integer(n, &num_channels);
+			continue;
+		}
 		if (strcmp(id, "playback_ports") == 0) {
 			if (snd_config_get_type(n) != SND_CONFIG_TYPE_COMPOUND) {
 				SNDERR("Invalid type for %s", id);
@@ -454,7 +469,7 @@ SND_PCM_PLUGIN_DEFINE_FUNC(jack)
 		return -EINVAL;
 	}
 
-	err = snd_pcm_jack_open(pcmp, name, playback_conf, capture_conf, stream, mode);
+	err = snd_pcm_jack_open(pcmp, name, playback_conf, capture_conf, stream, mode, num_channels);
 
 	return err;
 }
-- 
1.8.1.4


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