[ALSA] Simplify the format conversion in PCM OSS emulation

Simplify the format conversion code in PCM OSS emulation.
This patch also adds the support of 3bytes 24bit formats with linear
and mulaw, but they are not enabled in pcm_plugin.c yet.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

1 files changed, 48 insertions, 35 deletions

diff --git a/sound/core/oss/mulaw.c b/sound/core/oss/mulaw.c
index 91b6242..3da3b81 100644
--- a/sound/core/oss/mulaw.c
+++ b/sound/core/oss/mulaw.c
@@ -146,19 +146,32 @@ typedef void (*mulaw_f)(struct snd_pcm_plugin *plugin,
 
 struct mulaw_priv {
 	mulaw_f func;
-	int conv;
+	int cvt_endian;			/* need endian conversion? */
+	unsigned int native_ofs;	/* byte offset in native format */
+	unsigned int copy_ofs;		/* byte offset in s16 format */
+	unsigned int native_bytes;	/* byte size of the native format */
+	unsigned int copy_bytes;	/* bytes to copy per conversion */
+	u16 flip; /* MSB flip for signedness, done after endian conversion */
 };
 
+static inline void cvt_s16_to_native(struct mulaw_priv *data,
+				     unsigned char *dst, u16 sample)
+{
+	sample ^= data->flip;
+	if (data->cvt_endian)
+		sample = swab16(sample);
+	if (data->native_bytes > data->copy_bytes)
+		memset(dst, 0, data->native_bytes);
+	memcpy(dst + data->native_ofs, (char *)&sample + data->copy_ofs,
+	       data->copy_bytes);
+}
+
 static void mulaw_decode(struct snd_pcm_plugin *plugin,
 			const struct snd_pcm_plugin_channel *src_channels,
 			struct snd_pcm_plugin_channel *dst_channels,
 			snd_pcm_uframes_t frames)
 {
-#define PUT_S16_LABELS
-#include "plugin_ops.h"
-#undef PUT_S16_LABELS
 	struct mulaw_priv *data = (struct mulaw_priv *)plugin->extra_data;
-	void *put = put_s16_labels[data->conv];
 	int channel;
 	int nchannels = plugin->src_format.channels;
 	for (channel = 0; channel < nchannels; ++channel) {
@@ -180,30 +193,33 @@ static void mulaw_decode(struct snd_pcm_plugin *plugin,
 		frames1 = frames;
 		while (frames1-- > 0) {
 			signed short sample = ulaw2linear(*src);
-			goto *put;
-#define PUT_S16_END after
-#include "plugin_ops.h"
-#undef PUT_S16_END
-		after:
+			cvt_s16_to_native(data, dst, sample);
 			src += src_step;
 			dst += dst_step;
 		}
 	}
 }
 
+static inline signed short cvt_native_to_s16(struct mulaw_priv *data,
+					     unsigned char *src)
+{
+	u16 sample = 0;
+	memcpy((char *)&sample + data->copy_ofs, src + data->native_ofs,
+	       data->copy_bytes);
+	if (data->cvt_endian)
+		sample = swab16(sample);
+	sample ^= data->flip;
+	return (signed short)sample;
+}
+
 static void mulaw_encode(struct snd_pcm_plugin *plugin,
 			const struct snd_pcm_plugin_channel *src_channels,
 			struct snd_pcm_plugin_channel *dst_channels,
 			snd_pcm_uframes_t frames)
 {
-#define GET_S16_LABELS
-#include "plugin_ops.h"
-#undef GET_S16_LABELS
 	struct mulaw_priv *data = (struct mulaw_priv *)plugin->extra_data;
-	void *get = get_s16_labels[data->conv];
 	int channel;
 	int nchannels = plugin->src_format.channels;
-	signed short sample = 0;
 	for (channel = 0; channel < nchannels; ++channel) {
 		char *src;
 		char *dst;
@@ -222,11 +238,7 @@ static void mulaw_encode(struct snd_pcm_plugin *plugin,
 		dst_step = dst_channels[channel].area.step / 8;
 		frames1 = frames;
 		while (frames1-- > 0) {
-			goto *get;
-#define GET_S16_END after
-#include "plugin_ops.h"
-#undef GET_S16_END
-		after:
+			signed short sample = cvt_native_to_s16(data, src);
 			*dst = linear2ulaw(sample);
 			src += src_step;
 			dst += dst_step;
@@ -262,23 +274,25 @@ static snd_pcm_sframes_t mulaw_transfer(struct snd_pcm_plugin *plugin,
 	return frames;
 }
 
-static int getput_index(int format)
+static void init_data(struct mulaw_priv *data, int format)
 {
-	int sign, width, endian;
-	sign = !snd_pcm_format_signed(format);
-	width = snd_pcm_format_width(format) / 8 - 1;
-	if (width < 0 || width > 3) {
-		snd_printk(KERN_ERR "snd-pcm-oss: invalid format %d\n", format);
-		width = 0;
-	}
 #ifdef SNDRV_LITTLE_ENDIAN
-	endian = snd_pcm_format_big_endian(format);
+	data->cvt_endian = snd_pcm_format_big_endian(format) > 0;
 #else
-	endian = snd_pcm_format_little_endian(format);
+	data->cvt_endian = snd_pcm_format_little_endian(format) > 0;
 #endif
-	if (endian < 0)
-		endian = 0;
-	return width * 4 + endian * 2 + sign;
+	if (!snd_pcm_format_signed(format))
+		data->flip = 0x8000;
+	data->native_bytes = snd_pcm_format_physical_width(format) / 8;
+	data->copy_bytes = data->native_bytes < 2 ? 1 : 2;
+	if (snd_pcm_format_little_endian(format)) {
+		data->native_ofs = data->native_bytes - data->copy_bytes;
+		data->copy_ofs = 2 - data->copy_bytes;
+	} else {
+		/* S24 in 4bytes need an 1 byte offset */
+		data->native_ofs = data->native_bytes -
+			snd_pcm_format_width(format) / 8;
+	}
 }
 
 int snd_pcm_plugin_build_mulaw(struct snd_pcm_substream *plug,
@@ -319,8 +333,7 @@ int snd_pcm_plugin_build_mulaw(struct snd_pcm_substream *plug,
 		return err;
 	data = (struct mulaw_priv *)plugin->extra_data;
 	data->func = func;
-	data->conv = getput_index(format->format);
-	snd_assert(data->conv >= 0 && data->conv < 4*2*2, return -EINVAL);
+	init_data(data, format->format);
 	plugin->transfer = mulaw_transfer;
 	*r_plugin = plugin;
 	return 0;