ALSA: line6: Allow different channel numbers for in/out

Changes bytes_per_frame to bytes_per_channel.
Signed-off-by: Andrej Krutak <dev@andree.sk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/line6/capture.c

@@ -90,7 +90,9 @@ void line6_capture_copy(struct snd_line6_pcm *line6pcm, char *fbuf, int fsize)
 	struct snd_pcm_substream *substream =
 	    get_substream(line6pcm, SNDRV_PCM_STREAM_CAPTURE);
 	struct snd_pcm_runtime *runtime = substream->runtime;
-	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
+	const int bytes_per_frame =
+		line6pcm->properties->bytes_per_channel *
+		line6pcm->properties->capture_hw.channels_max;
 	int frames = fsize / bytes_per_frame;
 
 	if (runtime == NULL)
@@ -191,7 +193,9 @@ static void audio_in_callback(struct urb *urb)
 		 */
 
 		line6pcm->prev_fbuf = fbuf;
-		line6pcm->prev_fsize = fsize;
+		line6pcm->prev_fsize = fsize /
+			(line6pcm->properties->bytes_per_channel *
+			line6pcm->properties->capture_hw.channels_max);
 
 		if (!test_bit(LINE6_STREAM_IMPULSE, &line6pcm->in.running) &&
 		    test_bit(LINE6_STREAM_PCM, &line6pcm->in.running) &&

sound/usb/line6/driver.h

@@ -31,7 +31,7 @@
 #define LINE6_FALLBACK_MAXPACKETSIZE 16
 
 #define LINE6_TIMEOUT 1
-#define LINE6_BUFSIZE_LISTEN 32
+#define LINE6_BUFSIZE_LISTEN 64
 #define LINE6_MESSAGE_MAXLEN 256
 
 /*

sound/usb/line6/pcm.h

@@ -84,7 +84,7 @@ enum {
 struct line6_pcm_properties {
 	struct snd_pcm_hardware playback_hw, capture_hw;
 	struct snd_pcm_hw_constraint_ratdens rates;
-	int bytes_per_frame;
+	int bytes_per_channel;
 };
 
 struct line6_pcm_stream {

sound/usb/line6/playback.c

@@ -146,7 +146,9 @@ static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
 	int index;
 	int i, urb_size, urb_frames;
 	int ret;
-	const int bytes_per_frame = line6pcm->properties->bytes_per_frame;
+	const int bytes_per_frame =
+		line6pcm->properties->bytes_per_channel *
+		line6pcm->properties->playback_hw.channels_max;
 	const int frame_increment =
 		line6pcm->properties->rates.rats[0].num_min;
 	const int frame_factor =
@@ -165,6 +167,7 @@ static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
 	urb_out = line6pcm->out.urbs[index];
 	urb_size = 0;
 
+	/* TODO: this may not work for LINE6_ISO_PACKETS != 1 */
 	for (i = 0; i < LINE6_ISO_PACKETS; ++i) {
 		/* compute frame size for given sampling rate */
 		int fsize = 0;
@@ -178,9 +181,11 @@ static int submit_audio_out_urb(struct snd_line6_pcm *line6pcm)
 			line6pcm->out.count += frame_increment;
 			n = line6pcm->out.count / frame_factor;
 			line6pcm->out.count -= n * frame_factor;
-			fsize = n * bytes_per_frame;
+			fsize = n;
 		}
 
+		fsize *= bytes_per_frame;
+
 		fout->offset = urb_size;
 		fout->length = fsize;
 		urb_size += fsize;
@@ -305,6 +310,9 @@ static void audio_out_callback(struct urb *urb)
 	struct snd_line6_pcm *line6pcm = (struct snd_line6_pcm *)urb->context;
 	struct snd_pcm_substream *substream =
 	    get_substream(line6pcm, SNDRV_PCM_STREAM_PLAYBACK);
+	const int bytes_per_frame =
+		line6pcm->properties->bytes_per_channel *
+		line6pcm->properties->playback_hw.channels_max;
 
 #if USE_CLEAR_BUFFER_WORKAROUND
 	memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
@@ -329,7 +337,7 @@ static void audio_out_callback(struct urb *urb)
 		struct snd_pcm_runtime *runtime = substream->runtime;
 
 		line6pcm->out.pos_done +=
-		    length / line6pcm->properties->bytes_per_frame;
+		    length / bytes_per_frame;
 
 		if (line6pcm->out.pos_done >= runtime->buffer_size)
 			line6pcm->out.pos_done -= runtime->buffer_size;

sound/usb/line6/pod.c

@@ -83,7 +83,6 @@ struct usb_line6_pod {
 };
 
 #define POD_SYSEX_CODE 3
-#define POD_BYTES_PER_FRAME 6	/* 24bit audio (stereo) */
 
 /* *INDENT-OFF* */
 
@@ -167,7 +166,7 @@ static struct line6_pcm_properties pod_pcm_properties = {
 	.rates = {
 			    .nrats = 1,
 			    .rats = &pod_ratden},
-	.bytes_per_frame = POD_BYTES_PER_FRAME
+	.bytes_per_channel = 3 /* SNDRV_PCM_FMTBIT_S24_3LE */
 };
 
 static const char pod_version_header[] = {

sound/usb/line6/podhd.c

@@ -25,8 +25,6 @@ enum {
 	LINE6_PODHD500_1,
 };
 
-#define PODHD_BYTES_PER_FRAME 6	/* 24bit audio (stereo) */
-
 static struct snd_ratden podhd_ratden = {
 	.num_min = 48000,
 	.num_max = 48000,
@@ -73,7 +71,7 @@ static struct line6_pcm_properties podhd_pcm_properties = {
 	.rates = {
 			    .nrats = 1,
 			    .rats = &podhd_ratden},
-	.bytes_per_frame = PODHD_BYTES_PER_FRAME
+	.bytes_per_channel = 3 /* 24bit audio (stereo) */
 };
 
 /*

sound/usb/line6/toneport.c

@@ -114,7 +114,7 @@ static struct line6_pcm_properties toneport_pcm_properties = {
 	.rates = {
 			    .nrats = 1,
 			    .rats = &toneport_ratden},
-	.bytes_per_frame = 4
+	.bytes_per_channel = 2
 };
 
 static const struct {