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Diffstat (limited to 'sound/core/oss/mulaw.c')
-rw-r--r--sound/core/oss/mulaw.c160
1 files changed, 98 insertions, 62 deletions
diff --git a/sound/core/oss/mulaw.c b/sound/core/oss/mulaw.c
index 44ec4c66eb1..7915564bd39 100644
--- a/sound/core/oss/mulaw.c
+++ b/sound/core/oss/mulaw.c
@@ -1,6 +1,6 @@
/*
* Mu-Law conversion Plug-In Interface
- * Copyright (c) 1999 by Jaroslav Kysela <perex@suse.cz>
+ * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz>
* Uros Bizjak <uros@kss-loka.si>
*
* Based on reference implementation by Sun Microsystems, Inc.
@@ -21,7 +21,6 @@
*
*/
-#include <sound/driver.h>
#include <linux/time.h>
#include <sound/core.h>
#include <sound/pcm.h>
@@ -139,26 +138,39 @@ static int ulaw2linear(unsigned char u_val)
* Basic Mu-Law plugin
*/
-typedef void (*mulaw_f)(snd_pcm_plugin_t *plugin,
- const snd_pcm_plugin_channel_t *src_channels,
- snd_pcm_plugin_channel_t *dst_channels,
+typedef void (*mulaw_f)(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);
-typedef struct mulaw_private_data {
+struct mulaw_priv {
mulaw_f func;
- int conv;
-} mulaw_t;
+ 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 void mulaw_decode(snd_pcm_plugin_t *plugin,
- const snd_pcm_plugin_channel_t *src_channels,
- snd_pcm_plugin_channel_t *dst_channels,
+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
- mulaw_t *data = (mulaw_t *)plugin->extra_data;
- void *put = put_s16_labels[data->conv];
+ struct mulaw_priv *data = (struct mulaw_priv *)plugin->extra_data;
int channel;
int nchannels = plugin->src_format.channels;
for (channel = 0; channel < nchannels; ++channel) {
@@ -180,30 +192,33 @@ static void mulaw_decode(snd_pcm_plugin_t *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 void mulaw_encode(snd_pcm_plugin_t *plugin,
- const snd_pcm_plugin_channel_t *src_channels,
- snd_pcm_plugin_channel_t *dst_channels,
+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
- mulaw_t *data = (mulaw_t *)plugin->extra_data;
- void *get = get_s16_labels[data->conv];
+ struct mulaw_priv *data = (struct mulaw_priv *)plugin->extra_data;
int channel;
int nchannels = plugin->src_format.channels;
- signed short sample = 0;
for (channel = 0; channel < nchannels; ++channel) {
char *src;
char *dst;
@@ -222,11 +237,7 @@ static void mulaw_encode(snd_pcm_plugin_t *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;
@@ -234,50 +245,75 @@ static void mulaw_encode(snd_pcm_plugin_t *plugin,
}
}
-static snd_pcm_sframes_t mulaw_transfer(snd_pcm_plugin_t *plugin,
- const snd_pcm_plugin_channel_t *src_channels,
- snd_pcm_plugin_channel_t *dst_channels,
+static snd_pcm_sframes_t mulaw_transfer(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)
{
- mulaw_t *data;
+ struct mulaw_priv *data;
- snd_assert(plugin != NULL && src_channels != NULL && dst_channels != NULL, return -ENXIO);
+ if (snd_BUG_ON(!plugin || !src_channels || !dst_channels))
+ return -ENXIO;
if (frames == 0)
return 0;
#ifdef CONFIG_SND_DEBUG
{
unsigned int channel;
for (channel = 0; channel < plugin->src_format.channels; channel++) {
- snd_assert(src_channels[channel].area.first % 8 == 0 &&
- src_channels[channel].area.step % 8 == 0,
- return -ENXIO);
- snd_assert(dst_channels[channel].area.first % 8 == 0 &&
- dst_channels[channel].area.step % 8 == 0,
- return -ENXIO);
+ if (snd_BUG_ON(src_channels[channel].area.first % 8 ||
+ src_channels[channel].area.step % 8))
+ return -ENXIO;
+ if (snd_BUG_ON(dst_channels[channel].area.first % 8 ||
+ dst_channels[channel].area.step % 8))
+ return -ENXIO;
}
}
#endif
- data = (mulaw_t *)plugin->extra_data;
+ data = (struct mulaw_priv *)plugin->extra_data;
data->func(plugin, src_channels, dst_channels, frames);
return frames;
}
-int snd_pcm_plugin_build_mulaw(snd_pcm_plug_t *plug,
- snd_pcm_plugin_format_t *src_format,
- snd_pcm_plugin_format_t *dst_format,
- snd_pcm_plugin_t **r_plugin)
+static void init_data(struct mulaw_priv *data, snd_pcm_format_t format)
+{
+#ifdef SNDRV_LITTLE_ENDIAN
+ data->cvt_endian = snd_pcm_format_big_endian(format) > 0;
+#else
+ data->cvt_endian = snd_pcm_format_little_endian(format) > 0;
+#endif
+ 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,
+ struct snd_pcm_plugin_format *src_format,
+ struct snd_pcm_plugin_format *dst_format,
+ struct snd_pcm_plugin **r_plugin)
{
int err;
- mulaw_t *data;
- snd_pcm_plugin_t *plugin;
- snd_pcm_plugin_format_t *format;
+ struct mulaw_priv *data;
+ struct snd_pcm_plugin *plugin;
+ struct snd_pcm_plugin_format *format;
mulaw_f func;
- snd_assert(r_plugin != NULL, return -ENXIO);
+ if (snd_BUG_ON(!r_plugin))
+ return -ENXIO;
*r_plugin = NULL;
- snd_assert(src_format->rate == dst_format->rate, return -ENXIO);
- snd_assert(src_format->channels == dst_format->channels, return -ENXIO);
+ if (snd_BUG_ON(src_format->rate != dst_format->rate))
+ return -ENXIO;
+ if (snd_BUG_ON(src_format->channels != dst_format->channels))
+ return -ENXIO;
if (dst_format->format == SNDRV_PCM_FORMAT_MU_LAW) {
format = src_format;
@@ -291,17 +327,17 @@ int snd_pcm_plugin_build_mulaw(snd_pcm_plug_t *plug,
snd_BUG();
return -EINVAL;
}
- snd_assert(snd_pcm_format_linear(format->format) != 0, return -ENXIO);
+ if (snd_BUG_ON(!snd_pcm_format_linear(format->format)))
+ return -ENXIO;
err = snd_pcm_plugin_build(plug, "Mu-Law<->linear conversion",
src_format, dst_format,
- sizeof(mulaw_t), &plugin);
+ sizeof(struct mulaw_priv), &plugin);
if (err < 0)
return err;
- data = (mulaw_t*)plugin->extra_data;
+ 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;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 18:34:09 +0000