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-rw-r--r--ANDROID_3.4.5/sound/core/oss/rate.c348
1 files changed, 0 insertions, 348 deletions
diff --git a/ANDROID_3.4.5/sound/core/oss/rate.c b/ANDROID_3.4.5/sound/core/oss/rate.c
deleted file mode 100644
index 2fa9299a..00000000
--- a/ANDROID_3.4.5/sound/core/oss/rate.c
+++ /dev/null
@@ -1,348 +0,0 @@
-/*
- * Rate conversion Plug-In
- * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz>
- *
- *
- * This library is free software; you can redistribute it and/or modify
- * it under the terms of the GNU Library General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-#include <linux/time.h>
-#include <sound/core.h>
-#include <sound/pcm.h>
-#include "pcm_plugin.h"
-
-#define SHIFT 11
-#define BITS (1<<SHIFT)
-#define R_MASK (BITS-1)
-
-/*
- * Basic rate conversion plugin
- */
-
-struct rate_channel {
- signed short last_S1;
- signed short last_S2;
-};
-
-typedef void (*rate_f)(struct snd_pcm_plugin *plugin,
- const struct snd_pcm_plugin_channel *src_channels,
- struct snd_pcm_plugin_channel *dst_channels,
- int src_frames, int dst_frames);
-
-struct rate_priv {
- unsigned int pitch;
- unsigned int pos;
- rate_f func;
- snd_pcm_sframes_t old_src_frames, old_dst_frames;
- struct rate_channel channels[0];
-};
-
-static void rate_init(struct snd_pcm_plugin *plugin)
-{
- unsigned int channel;
- struct rate_priv *data = (struct rate_priv *)plugin->extra_data;
- data->pos = 0;
- for (channel = 0; channel < plugin->src_format.channels; channel++) {
- data->channels[channel].last_S1 = 0;
- data->channels[channel].last_S2 = 0;
- }
-}
-
-static void resample_expand(struct snd_pcm_plugin *plugin,
- const struct snd_pcm_plugin_channel *src_channels,
- struct snd_pcm_plugin_channel *dst_channels,
- int src_frames, int dst_frames)
-{
- unsigned int pos = 0;
- signed int val;
- signed short S1, S2;
- signed short *src, *dst;
- unsigned int channel;
- int src_step, dst_step;
- int src_frames1, dst_frames1;
- struct rate_priv *data = (struct rate_priv *)plugin->extra_data;
- struct rate_channel *rchannels = data->channels;
-
- for (channel = 0; channel < plugin->src_format.channels; channel++) {
- pos = data->pos;
- S1 = rchannels->last_S1;
- S2 = rchannels->last_S2;
- if (!src_channels[channel].enabled) {
- if (dst_channels[channel].wanted)
- snd_pcm_area_silence(&dst_channels[channel].area, 0, dst_frames, plugin->dst_format.format);
- dst_channels[channel].enabled = 0;
- continue;
- }
- dst_channels[channel].enabled = 1;
- src = (signed short *)src_channels[channel].area.addr +
- src_channels[channel].area.first / 8 / 2;
- dst = (signed short *)dst_channels[channel].area.addr +
- dst_channels[channel].area.first / 8 / 2;
- src_step = src_channels[channel].area.step / 8 / 2;
- dst_step = dst_channels[channel].area.step / 8 / 2;
- src_frames1 = src_frames;
- dst_frames1 = dst_frames;
- while (dst_frames1-- > 0) {
- if (pos & ~R_MASK) {
- pos &= R_MASK;
- S1 = S2;
- if (src_frames1-- > 0) {
- S2 = *src;
- src += src_step;
- }
- }
- val = S1 + ((S2 - S1) * (signed int)pos) / BITS;
- if (val < -32768)
- val = -32768;
- else if (val > 32767)
- val = 32767;
- *dst = val;
- dst += dst_step;
- pos += data->pitch;
- }
- rchannels->last_S1 = S1;
- rchannels->last_S2 = S2;
- rchannels++;
- }
- data->pos = pos;
-}
-
-static void resample_shrink(struct snd_pcm_plugin *plugin,
- const struct snd_pcm_plugin_channel *src_channels,
- struct snd_pcm_plugin_channel *dst_channels,
- int src_frames, int dst_frames)
-{
- unsigned int pos = 0;
- signed int val;
- signed short S1, S2;
- signed short *src, *dst;
- unsigned int channel;
- int src_step, dst_step;
- int src_frames1, dst_frames1;
- struct rate_priv *data = (struct rate_priv *)plugin->extra_data;
- struct rate_channel *rchannels = data->channels;
-
- for (channel = 0; channel < plugin->src_format.channels; ++channel) {
- pos = data->pos;
- S1 = rchannels->last_S1;
- S2 = rchannels->last_S2;
- if (!src_channels[channel].enabled) {
- if (dst_channels[channel].wanted)
- snd_pcm_area_silence(&dst_channels[channel].area, 0, dst_frames, plugin->dst_format.format);
- dst_channels[channel].enabled = 0;
- continue;
- }
- dst_channels[channel].enabled = 1;
- src = (signed short *)src_channels[channel].area.addr +
- src_channels[channel].area.first / 8 / 2;
- dst = (signed short *)dst_channels[channel].area.addr +
- dst_channels[channel].area.first / 8 / 2;
- src_step = src_channels[channel].area.step / 8 / 2;
- dst_step = dst_channels[channel].area.step / 8 / 2;
- src_frames1 = src_frames;
- dst_frames1 = dst_frames;
- while (dst_frames1 > 0) {
- S1 = S2;
- if (src_frames1-- > 0) {
- S2 = *src;
- src += src_step;
- }
- if (pos & ~R_MASK) {
- pos &= R_MASK;
- val = S1 + ((S2 - S1) * (signed int)pos) / BITS;
- if (val < -32768)
- val = -32768;
- else if (val > 32767)
- val = 32767;
- *dst = val;
- dst += dst_step;
- dst_frames1--;
- }
- pos += data->pitch;
- }
- rchannels->last_S1 = S1;
- rchannels->last_S2 = S2;
- rchannels++;
- }
- data->pos = pos;
-}
-
-static snd_pcm_sframes_t rate_src_frames(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
-{
- struct rate_priv *data;
- snd_pcm_sframes_t res;
-
- if (snd_BUG_ON(!plugin))
- return -ENXIO;
- if (frames == 0)
- return 0;
- data = (struct rate_priv *)plugin->extra_data;
- if (plugin->src_format.rate < plugin->dst_format.rate) {
- res = (((frames * data->pitch) + (BITS/2)) >> SHIFT);
- } else {
- res = (((frames << SHIFT) + (data->pitch / 2)) / data->pitch);
- }
- if (data->old_src_frames > 0) {
- snd_pcm_sframes_t frames1 = frames, res1 = data->old_dst_frames;
- while (data->old_src_frames < frames1) {
- frames1 >>= 1;
- res1 <<= 1;
- }
- while (data->old_src_frames > frames1) {
- frames1 <<= 1;
- res1 >>= 1;
- }
- if (data->old_src_frames == frames1)
- return res1;
- }
- data->old_src_frames = frames;
- data->old_dst_frames = res;
- return res;
-}
-
-static snd_pcm_sframes_t rate_dst_frames(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
-{
- struct rate_priv *data;
- snd_pcm_sframes_t res;
-
- if (snd_BUG_ON(!plugin))
- return -ENXIO;
- if (frames == 0)
- return 0;
- data = (struct rate_priv *)plugin->extra_data;
- if (plugin->src_format.rate < plugin->dst_format.rate) {
- res = (((frames << SHIFT) + (data->pitch / 2)) / data->pitch);
- } else {
- res = (((frames * data->pitch) + (BITS/2)) >> SHIFT);
- }
- if (data->old_dst_frames > 0) {
- snd_pcm_sframes_t frames1 = frames, res1 = data->old_src_frames;
- while (data->old_dst_frames < frames1) {
- frames1 >>= 1;
- res1 <<= 1;
- }
- while (data->old_dst_frames > frames1) {
- frames1 <<= 1;
- res1 >>= 1;
- }
- if (data->old_dst_frames == frames1)
- return res1;
- }
- data->old_dst_frames = frames;
- data->old_src_frames = res;
- return res;
-}
-
-static snd_pcm_sframes_t rate_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)
-{
- snd_pcm_uframes_t dst_frames;
- struct rate_priv *data;
-
- 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++) {
- 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
-
- dst_frames = rate_dst_frames(plugin, frames);
- if (dst_frames > dst_channels[0].frames)
- dst_frames = dst_channels[0].frames;
- data = (struct rate_priv *)plugin->extra_data;
- data->func(plugin, src_channels, dst_channels, frames, dst_frames);
- return dst_frames;
-}
-
-static int rate_action(struct snd_pcm_plugin *plugin,
- enum snd_pcm_plugin_action action,
- unsigned long udata)
-{
- if (snd_BUG_ON(!plugin))
- return -ENXIO;
- switch (action) {
- case INIT:
- case PREPARE:
- rate_init(plugin);
- break;
- default:
- break;
- }
- return 0; /* silenty ignore other actions */
-}
-
-int snd_pcm_plugin_build_rate(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;
- struct rate_priv *data;
- struct snd_pcm_plugin *plugin;
-
- if (snd_BUG_ON(!r_plugin))
- return -ENXIO;
- *r_plugin = NULL;
-
- if (snd_BUG_ON(src_format->channels != dst_format->channels))
- return -ENXIO;
- if (snd_BUG_ON(src_format->channels <= 0))
- return -ENXIO;
- if (snd_BUG_ON(src_format->format != SNDRV_PCM_FORMAT_S16))
- return -ENXIO;
- if (snd_BUG_ON(dst_format->format != SNDRV_PCM_FORMAT_S16))
- return -ENXIO;
- if (snd_BUG_ON(src_format->rate == dst_format->rate))
- return -ENXIO;
-
- err = snd_pcm_plugin_build(plug, "rate conversion",
- src_format, dst_format,
- sizeof(struct rate_priv) +
- src_format->channels * sizeof(struct rate_channel),
- &plugin);
- if (err < 0)
- return err;
- data = (struct rate_priv *)plugin->extra_data;
- if (src_format->rate < dst_format->rate) {
- data->pitch = ((src_format->rate << SHIFT) + (dst_format->rate >> 1)) / dst_format->rate;
- data->func = resample_expand;
- } else {
- data->pitch = ((dst_format->rate << SHIFT) + (src_format->rate >> 1)) / src_format->rate;
- data->func = resample_shrink;
- }
- data->pos = 0;
- rate_init(plugin);
- data->old_src_frames = data->old_dst_frames = 0;
- plugin->transfer = rate_transfer;
- plugin->src_frames = rate_src_frames;
- plugin->dst_frames = rate_dst_frames;
- plugin->action = rate_action;
- *r_plugin = plugin;
- return 0;
-}
generated by cgit (git 2.34.1) at 2025-06-03 01:38:59 +0000