--- /dev/null
+/*
+ * PCM Plug-In shared (kernel/library) code
+ * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz>
+ * Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
+ *
+ *
+ * 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
+ *
+ */
+
+#if 0
+#define PLUGIN_DEBUG
+#endif
+
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/vmalloc.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include "pcm_plugin.h"
+
+#define snd_pcm_plug_first(plug) ((plug)->runtime->oss.plugin_first)
+#define snd_pcm_plug_last(plug) ((plug)->runtime->oss.plugin_last)
+
+/*
+ * because some cards might have rates "very close", we ignore
+ * all "resampling" requests within +-5%
+ */
+static int rate_match(unsigned int src_rate, unsigned int dst_rate)
+{
+ unsigned int low = (src_rate * 95) / 100;
+ unsigned int high = (src_rate * 105) / 100;
+ return dst_rate >= low && dst_rate <= high;
+}
+
+static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_plugin_format *format;
+ ssize_t width;
+ size_t size;
+ unsigned int channel;
+ struct snd_pcm_plugin_channel *c;
+
+ if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ format = &plugin->src_format;
+ } else {
+ format = &plugin->dst_format;
+ }
+ if ((width = snd_pcm_format_physical_width(format->format)) < 0)
+ return width;
+ size = frames * format->channels * width;
+ if (snd_BUG_ON(size % 8))
+ return -ENXIO;
+ size /= 8;
+ if (plugin->buf_frames < frames) {
+ vfree(plugin->buf);
+ plugin->buf = vmalloc(size);
+ plugin->buf_frames = frames;
+ }
+ if (!plugin->buf) {
+ plugin->buf_frames = 0;
+ return -ENOMEM;
+ }
+ c = plugin->buf_channels;
+ if (plugin->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED) {
+ for (channel = 0; channel < format->channels; channel++, c++) {
+ c->frames = frames;
+ c->enabled = 1;
+ c->wanted = 0;
+ c->area.addr = plugin->buf;
+ c->area.first = channel * width;
+ c->area.step = format->channels * width;
+ }
+ } else if (plugin->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) {
+ if (snd_BUG_ON(size % format->channels))
+ return -EINVAL;
+ size /= format->channels;
+ for (channel = 0; channel < format->channels; channel++, c++) {
+ c->frames = frames;
+ c->enabled = 1;
+ c->wanted = 0;
+ c->area.addr = plugin->buf + (channel * size);
+ c->area.first = 0;
+ c->area.step = width;
+ }
+ } else
+ return -EINVAL;
+ return 0;
+}
+
+int snd_pcm_plug_alloc(struct snd_pcm_substream *plug, snd_pcm_uframes_t frames)
+{
+ int err;
+ if (snd_BUG_ON(!snd_pcm_plug_first(plug)))
+ return -ENXIO;
+ if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
+ struct snd_pcm_plugin *plugin = snd_pcm_plug_first(plug);
+ while (plugin->next) {
+ if (plugin->dst_frames)
+ frames = plugin->dst_frames(plugin, frames);
+ if (snd_BUG_ON(frames <= 0))
+ return -ENXIO;
+ plugin = plugin->next;
+ err = snd_pcm_plugin_alloc(plugin, frames);
+ if (err < 0)
+ return err;
+ }
+ } else {
+ struct snd_pcm_plugin *plugin = snd_pcm_plug_last(plug);
+ while (plugin->prev) {
+ if (plugin->src_frames)
+ frames = plugin->src_frames(plugin, frames);
+ if (snd_BUG_ON(frames <= 0))
+ return -ENXIO;
+ plugin = plugin->prev;
+ err = snd_pcm_plugin_alloc(plugin, frames);
+ if (err < 0)
+ return err;
+ }
+ }
+ return 0;
+}
+
+
+snd_pcm_sframes_t snd_pcm_plugin_client_channels(struct snd_pcm_plugin *plugin,
+ snd_pcm_uframes_t frames,
+ struct snd_pcm_plugin_channel **channels)
+{
+ *channels = plugin->buf_channels;
+ return frames;
+}
+
+int snd_pcm_plugin_build(struct snd_pcm_substream *plug,
+ const char *name,
+ struct snd_pcm_plugin_format *src_format,
+ struct snd_pcm_plugin_format *dst_format,
+ size_t extra,
+ struct snd_pcm_plugin **ret)
+{
+ struct snd_pcm_plugin *plugin;
+ unsigned int channels;
+
+ if (snd_BUG_ON(!plug))
+ return -ENXIO;
+ if (snd_BUG_ON(!src_format || !dst_format))
+ return -ENXIO;
+ plugin = kzalloc(sizeof(*plugin) + extra, GFP_KERNEL);
+ if (plugin == NULL)
+ return -ENOMEM;
+ plugin->name = name;
+ plugin->plug = plug;
+ plugin->stream = snd_pcm_plug_stream(plug);
+ plugin->access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
+ plugin->src_format = *src_format;
+ plugin->src_width = snd_pcm_format_physical_width(src_format->format);
+ snd_BUG_ON(plugin->src_width <= 0);
+ plugin->dst_format = *dst_format;
+ plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
+ snd_BUG_ON(plugin->dst_width <= 0);
+ if (plugin->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ channels = src_format->channels;
+ else
+ channels = dst_format->channels;
+ plugin->buf_channels = kcalloc(channels, sizeof(*plugin->buf_channels), GFP_KERNEL);
+ if (plugin->buf_channels == NULL) {
+ snd_pcm_plugin_free(plugin);
+ return -ENOMEM;
+ }
+ plugin->client_channels = snd_pcm_plugin_client_channels;
+ *ret = plugin;
+ return 0;
+}
+
+int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
+{
+ if (! plugin)
+ return 0;
+ if (plugin->private_free)
+ plugin->private_free(plugin);
+ kfree(plugin->buf_channels);
+ vfree(plugin->buf);
+ kfree(plugin);
+ return 0;
+}
+
+snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
+{
+ struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
+ int stream;
+
+ if (snd_BUG_ON(!plug))
+ return -ENXIO;
+ if (drv_frames == 0)
+ return 0;
+ stream = snd_pcm_plug_stream(plug);
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ plugin = snd_pcm_plug_last(plug);
+ while (plugin && drv_frames > 0) {
+ plugin_prev = plugin->prev;
+ if (plugin->src_frames)
+ drv_frames = plugin->src_frames(plugin, drv_frames);
+ plugin = plugin_prev;
+ }
+ } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
+ plugin = snd_pcm_plug_first(plug);
+ while (plugin && drv_frames > 0) {
+ plugin_next = plugin->next;
+ if (plugin->dst_frames)
+ drv_frames = plugin->dst_frames(plugin, drv_frames);
+ plugin = plugin_next;
+ }
+ } else
+ snd_BUG();
+ return drv_frames;
+}
+
+snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
+{
+ struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
+ snd_pcm_sframes_t frames;
+ int stream;
+
+ if (snd_BUG_ON(!plug))
+ return -ENXIO;
+ if (clt_frames == 0)
+ return 0;
+ frames = clt_frames;
+ stream = snd_pcm_plug_stream(plug);
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ plugin = snd_pcm_plug_first(plug);
+ while (plugin && frames > 0) {
+ plugin_next = plugin->next;
+ if (plugin->dst_frames) {
+ frames = plugin->dst_frames(plugin, frames);
+ if (frames < 0)
+ return frames;
+ }
+ plugin = plugin_next;
+ }
+ } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
+ plugin = snd_pcm_plug_last(plug);
+ while (plugin) {
+ plugin_prev = plugin->prev;
+ if (plugin->src_frames) {
+ frames = plugin->src_frames(plugin, frames);
+ if (frames < 0)
+ return frames;
+ }
+ plugin = plugin_prev;
+ }
+ } else
+ snd_BUG();
+ return frames;
+}
+
+static int snd_pcm_plug_formats(struct snd_mask *mask, snd_pcm_format_t format)
+{
+ struct snd_mask formats = *mask;
+ u64 linfmts = (SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S8 |
+ SNDRV_PCM_FMTBIT_U16_LE | SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_U16_BE | SNDRV_PCM_FMTBIT_S16_BE |
+ SNDRV_PCM_FMTBIT_U24_LE | SNDRV_PCM_FMTBIT_S24_LE |
+ SNDRV_PCM_FMTBIT_U24_BE | SNDRV_PCM_FMTBIT_S24_BE |
+ SNDRV_PCM_FMTBIT_U24_3LE | SNDRV_PCM_FMTBIT_S24_3LE |
+ SNDRV_PCM_FMTBIT_U24_3BE | SNDRV_PCM_FMTBIT_S24_3BE |
+ SNDRV_PCM_FMTBIT_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
+ SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
+ snd_mask_set(&formats, (__force int)SNDRV_PCM_FORMAT_MU_LAW);
+
+ if (formats.bits[0] & (u32)linfmts)
+ formats.bits[0] |= (u32)linfmts;
+ if (formats.bits[1] & (u32)(linfmts >> 32))
+ formats.bits[1] |= (u32)(linfmts >> 32);
+ return snd_mask_test(&formats, (__force int)format);
+}
+
+static snd_pcm_format_t preferred_formats[] = {
+ SNDRV_PCM_FORMAT_S16_LE,
+ SNDRV_PCM_FORMAT_S16_BE,
+ SNDRV_PCM_FORMAT_U16_LE,
+ SNDRV_PCM_FORMAT_U16_BE,
+ SNDRV_PCM_FORMAT_S24_3LE,
+ SNDRV_PCM_FORMAT_S24_3BE,
+ SNDRV_PCM_FORMAT_U24_3LE,
+ SNDRV_PCM_FORMAT_U24_3BE,
+ SNDRV_PCM_FORMAT_S24_LE,
+ SNDRV_PCM_FORMAT_S24_BE,
+ SNDRV_PCM_FORMAT_U24_LE,
+ SNDRV_PCM_FORMAT_U24_BE,
+ SNDRV_PCM_FORMAT_S32_LE,
+ SNDRV_PCM_FORMAT_S32_BE,
+ SNDRV_PCM_FORMAT_U32_LE,
+ SNDRV_PCM_FORMAT_U32_BE,
+ SNDRV_PCM_FORMAT_S8,
+ SNDRV_PCM_FORMAT_U8
+};
+
+snd_pcm_format_t snd_pcm_plug_slave_format(snd_pcm_format_t format,
+ struct snd_mask *format_mask)
+{
+ int i;
+
+ if (snd_mask_test(format_mask, (__force int)format))
+ return format;
+ if (!snd_pcm_plug_formats(format_mask, format))
+ return (__force snd_pcm_format_t)-EINVAL;
+ if (snd_pcm_format_linear(format)) {
+ unsigned int width = snd_pcm_format_width(format);
+ int unsignd = snd_pcm_format_unsigned(format) > 0;
+ int big = snd_pcm_format_big_endian(format) > 0;
+ unsigned int badness, best = -1;
+ snd_pcm_format_t best_format = (__force snd_pcm_format_t)-1;
+ for (i = 0; i < ARRAY_SIZE(preferred_formats); i++) {
+ snd_pcm_format_t f = preferred_formats[i];
+ unsigned int w;
+ if (!snd_mask_test(format_mask, (__force int)f))
+ continue;
+ w = snd_pcm_format_width(f);
+ if (w >= width)
+ badness = w - width;
+ else
+ badness = width - w + 32;
+ badness += snd_pcm_format_unsigned(f) != unsignd;
+ badness += snd_pcm_format_big_endian(f) != big;
+ if (badness < best) {
+ best_format = f;
+ best = badness;
+ }
+ }
+ if ((__force int)best_format >= 0)
+ return best_format;
+ else
+ return (__force snd_pcm_format_t)-EINVAL;
+ } else {
+ switch (format) {
+ case SNDRV_PCM_FORMAT_MU_LAW:
+ for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
+ snd_pcm_format_t format1 = preferred_formats[i];
+ if (snd_mask_test(format_mask, (__force int)format1))
+ return format1;
+ }
+ default:
+ return (__force snd_pcm_format_t)-EINVAL;
+ }
+ }
+}
+
+int snd_pcm_plug_format_plugins(struct snd_pcm_substream *plug,
+ struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_params *slave_params)
+{
+ struct snd_pcm_plugin_format tmpformat;
+ struct snd_pcm_plugin_format dstformat;
+ struct snd_pcm_plugin_format srcformat;
+ snd_pcm_access_t src_access, dst_access;
+ struct snd_pcm_plugin *plugin = NULL;
+ int err;
+ int stream = snd_pcm_plug_stream(plug);
+ int slave_interleaved = (params_channels(slave_params) == 1 ||
+ params_access(slave_params) == SNDRV_PCM_ACCESS_RW_INTERLEAVED);
+
+ switch (stream) {
+ case SNDRV_PCM_STREAM_PLAYBACK:
+ dstformat.format = params_format(slave_params);
+ dstformat.rate = params_rate(slave_params);
+ dstformat.channels = params_channels(slave_params);
+ srcformat.format = params_format(params);
+ srcformat.rate = params_rate(params);
+ srcformat.channels = params_channels(params);
+ src_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
+ dst_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
+ SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
+ break;
+ case SNDRV_PCM_STREAM_CAPTURE:
+ dstformat.format = params_format(params);
+ dstformat.rate = params_rate(params);
+ dstformat.channels = params_channels(params);
+ srcformat.format = params_format(slave_params);
+ srcformat.rate = params_rate(slave_params);
+ srcformat.channels = params_channels(slave_params);
+ src_access = (slave_interleaved ? SNDRV_PCM_ACCESS_RW_INTERLEAVED :
+ SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
+ dst_access = SNDRV_PCM_ACCESS_RW_INTERLEAVED;
+ break;
+ default:
+ snd_BUG();
+ return -EINVAL;
+ }
+ tmpformat = srcformat;
+
+ pdprintf("srcformat: format=%i, rate=%i, channels=%i\n",
+ srcformat.format,
+ srcformat.rate,
+ srcformat.channels);
+ pdprintf("dstformat: format=%i, rate=%i, channels=%i\n",
+ dstformat.format,
+ dstformat.rate,
+ dstformat.channels);
+
+ /* Format change (linearization) */
+ if (! rate_match(srcformat.rate, dstformat.rate) &&
+ ! snd_pcm_format_linear(srcformat.format)) {
+ if (srcformat.format != SNDRV_PCM_FORMAT_MU_LAW)
+ return -EINVAL;
+ tmpformat.format = SNDRV_PCM_FORMAT_S16;
+ err = snd_pcm_plugin_build_mulaw(plug,
+ &srcformat, &tmpformat,
+ &plugin);
+ if (err < 0)
+ return err;
+ err = snd_pcm_plugin_append(plugin);
+ if (err < 0) {
+ snd_pcm_plugin_free(plugin);
+ return err;
+ }
+ srcformat = tmpformat;
+ src_access = dst_access;
+ }
+
+ /* channels reduction */
+ if (srcformat.channels > dstformat.channels) {
+ tmpformat.channels = dstformat.channels;
+ err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
+ pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
+ if (err < 0)
+ return err;
+ err = snd_pcm_plugin_append(plugin);
+ if (err < 0) {
+ snd_pcm_plugin_free(plugin);
+ return err;
+ }
+ srcformat = tmpformat;
+ src_access = dst_access;
+ }
+
+ /* rate resampling */
+ if (!rate_match(srcformat.rate, dstformat.rate)) {
+ if (srcformat.format != SNDRV_PCM_FORMAT_S16) {
+ /* convert to S16 for resampling */
+ tmpformat.format = SNDRV_PCM_FORMAT_S16;
+ err = snd_pcm_plugin_build_linear(plug,
+ &srcformat, &tmpformat,
+ &plugin);
+ if (err < 0)
+ return err;
+ err = snd_pcm_plugin_append(plugin);
+ if (err < 0) {
+ snd_pcm_plugin_free(plugin);
+ return err;
+ }
+ srcformat = tmpformat;
+ src_access = dst_access;
+ }
+ tmpformat.rate = dstformat.rate;
+ err = snd_pcm_plugin_build_rate(plug,
+ &srcformat, &tmpformat,
+ &plugin);
+ pdprintf("rate down resampling: src=%i, dst=%i returns %i\n", srcformat.rate, tmpformat.rate, err);
+ if (err < 0)
+ return err;
+ err = snd_pcm_plugin_append(plugin);
+ if (err < 0) {
+ snd_pcm_plugin_free(plugin);
+ return err;
+ }
+ srcformat = tmpformat;
+ src_access = dst_access;
+ }
+
+ /* format change */
+ if (srcformat.format != dstformat.format) {
+ tmpformat.format = dstformat.format;
+ if (srcformat.format == SNDRV_PCM_FORMAT_MU_LAW ||
+ tmpformat.format == SNDRV_PCM_FORMAT_MU_LAW) {
+ err = snd_pcm_plugin_build_mulaw(plug,
+ &srcformat, &tmpformat,
+ &plugin);
+ }
+ else if (snd_pcm_format_linear(srcformat.format) &&
+ snd_pcm_format_linear(tmpformat.format)) {
+ err = snd_pcm_plugin_build_linear(plug,
+ &srcformat, &tmpformat,
+ &plugin);
+ }
+ else
+ return -EINVAL;
+ pdprintf("format change: src=%i, dst=%i returns %i\n", srcformat.format, tmpformat.format, err);
+ if (err < 0)
+ return err;
+ err = snd_pcm_plugin_append(plugin);
+ if (err < 0) {
+ snd_pcm_plugin_free(plugin);
+ return err;
+ }
+ srcformat = tmpformat;
+ src_access = dst_access;
+ }
+
+ /* channels extension */
+ if (srcformat.channels < dstformat.channels) {
+ tmpformat.channels = dstformat.channels;
+ err = snd_pcm_plugin_build_route(plug, &srcformat, &tmpformat, &plugin);
+ pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
+ if (err < 0)
+ return err;
+ err = snd_pcm_plugin_append(plugin);
+ if (err < 0) {
+ snd_pcm_plugin_free(plugin);
+ return err;
+ }
+ srcformat = tmpformat;
+ src_access = dst_access;
+ }
+
+ /* de-interleave */
+ if (src_access != dst_access) {
+ err = snd_pcm_plugin_build_copy(plug,
+ &srcformat,
+ &tmpformat,
+ &plugin);
+ pdprintf("interleave change (copy: returns %i)\n", err);
+ if (err < 0)
+ return err;
+ err = snd_pcm_plugin_append(plugin);
+ if (err < 0) {
+ snd_pcm_plugin_free(plugin);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+snd_pcm_sframes_t snd_pcm_plug_client_channels_buf(struct snd_pcm_substream *plug,
+ char *buf,
+ snd_pcm_uframes_t count,
+ struct snd_pcm_plugin_channel **channels)
+{
+ struct snd_pcm_plugin *plugin;
+ struct snd_pcm_plugin_channel *v;
+ struct snd_pcm_plugin_format *format;
+ int width, nchannels, channel;
+ int stream = snd_pcm_plug_stream(plug);
+
+ if (snd_BUG_ON(!buf))
+ return -ENXIO;
+ if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ plugin = snd_pcm_plug_first(plug);
+ format = &plugin->src_format;
+ } else {
+ plugin = snd_pcm_plug_last(plug);
+ format = &plugin->dst_format;
+ }
+ v = plugin->buf_channels;
+ *channels = v;
+ if ((width = snd_pcm_format_physical_width(format->format)) < 0)
+ return width;
+ nchannels = format->channels;
+ if (snd_BUG_ON(plugin->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
+ format->channels > 1))
+ return -ENXIO;
+ for (channel = 0; channel < nchannels; channel++, v++) {
+ v->frames = count;
+ v->enabled = 1;
+ v->wanted = (stream == SNDRV_PCM_STREAM_CAPTURE);
+ v->area.addr = buf;
+ v->area.first = channel * width;
+ v->area.step = nchannels * width;
+ }
+ return count;
+}
+
+snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *src_channels, snd_pcm_uframes_t size)
+{
+ struct snd_pcm_plugin *plugin, *next;
+ struct snd_pcm_plugin_channel *dst_channels;
+ int err;
+ snd_pcm_sframes_t frames = size;
+
+ plugin = snd_pcm_plug_first(plug);
+ while (plugin && frames > 0) {
+ if ((next = plugin->next) != NULL) {
+ snd_pcm_sframes_t frames1 = frames;
+ if (plugin->dst_frames)
+ frames1 = plugin->dst_frames(plugin, frames);
+ if ((err = next->client_channels(next, frames1, &dst_channels)) < 0) {
+ return err;
+ }
+ if (err != frames1) {
+ frames = err;
+ if (plugin->src_frames)
+ frames = plugin->src_frames(plugin, frames1);
+ }
+ } else
+ dst_channels = NULL;
+ pdprintf("write plugin: %s, %li\n", plugin->name, frames);
+ if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
+ return frames;
+ src_channels = dst_channels;
+ plugin = next;
+ }
+ return snd_pcm_plug_client_size(plug, frames);
+}
+
+snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *dst_channels_final, snd_pcm_uframes_t size)
+{
+ struct snd_pcm_plugin *plugin, *next;
+ struct snd_pcm_plugin_channel *src_channels, *dst_channels;
+ snd_pcm_sframes_t frames = size;
+ int err;
+
+ frames = snd_pcm_plug_slave_size(plug, frames);
+ if (frames < 0)
+ return frames;
+
+ src_channels = NULL;
+ plugin = snd_pcm_plug_first(plug);
+ while (plugin && frames > 0) {
+ if ((next = plugin->next) != NULL) {
+ if ((err = plugin->client_channels(plugin, frames, &dst_channels)) < 0) {
+ return err;
+ }
+ frames = err;
+ } else {
+ dst_channels = dst_channels_final;
+ }
+ pdprintf("read plugin: %s, %li\n", plugin->name, frames);
+ if ((frames = plugin->transfer(plugin, src_channels, dst_channels, frames)) < 0)
+ return frames;
+ plugin = next;
+ src_channels = dst_channels;
+ }
+ return frames;
+}
+
+int snd_pcm_area_silence(const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
+ size_t samples, snd_pcm_format_t format)
+{
+ /* FIXME: sub byte resolution and odd dst_offset */
+ unsigned char *dst;
+ unsigned int dst_step;
+ int width;
+ const unsigned char *silence;
+ if (!dst_area->addr)
+ return 0;
+ dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
+ width = snd_pcm_format_physical_width(format);
+ if (width <= 0)
+ return -EINVAL;
+ if (dst_area->step == (unsigned int) width && width >= 8)
+ return snd_pcm_format_set_silence(format, dst, samples);
+ silence = snd_pcm_format_silence_64(format);
+ if (! silence)
+ return -EINVAL;
+ dst_step = dst_area->step / 8;
+ if (width == 4) {
+ /* Ima ADPCM */
+ int dstbit = dst_area->first % 8;
+ int dstbit_step = dst_area->step % 8;
+ while (samples-- > 0) {
+ if (dstbit)
+ *dst &= 0xf0;
+ else
+ *dst &= 0x0f;
+ dst += dst_step;
+ dstbit += dstbit_step;
+ if (dstbit == 8) {
+ dst++;
+ dstbit = 0;
+ }
+ }
+ } else {
+ width /= 8;
+ while (samples-- > 0) {
+ memcpy(dst, silence, width);
+ dst += dst_step;
+ }
+ }
+ return 0;
+}
+
+int snd_pcm_area_copy(const struct snd_pcm_channel_area *src_area, size_t src_offset,
+ const struct snd_pcm_channel_area *dst_area, size_t dst_offset,
+ size_t samples, snd_pcm_format_t format)
+{
+ /* FIXME: sub byte resolution and odd dst_offset */
+ char *src, *dst;
+ int width;
+ int src_step, dst_step;
+ src = src_area->addr + (src_area->first + src_area->step * src_offset) / 8;
+ if (!src_area->addr)
+ return snd_pcm_area_silence(dst_area, dst_offset, samples, format);
+ dst = dst_area->addr + (dst_area->first + dst_area->step * dst_offset) / 8;
+ if (!dst_area->addr)
+ return 0;
+ width = snd_pcm_format_physical_width(format);
+ if (width <= 0)
+ return -EINVAL;
+ if (src_area->step == (unsigned int) width &&
+ dst_area->step == (unsigned int) width && width >= 8) {
+ size_t bytes = samples * width / 8;
+ memcpy(dst, src, bytes);
+ return 0;
+ }
+ src_step = src_area->step / 8;
+ dst_step = dst_area->step / 8;
+ if (width == 4) {
+ /* Ima ADPCM */
+ int srcbit = src_area->first % 8;
+ int srcbit_step = src_area->step % 8;
+ int dstbit = dst_area->first % 8;
+ int dstbit_step = dst_area->step % 8;
+ while (samples-- > 0) {
+ unsigned char srcval;
+ if (srcbit)
+ srcval = *src & 0x0f;
+ else
+ srcval = (*src & 0xf0) >> 4;
+ if (dstbit)
+ *dst = (*dst & 0xf0) | srcval;
+ else
+ *dst = (*dst & 0x0f) | (srcval << 4);
+ src += src_step;
+ srcbit += srcbit_step;
+ if (srcbit == 8) {
+ src++;
+ srcbit = 0;
+ }
+ dst += dst_step;
+ dstbit += dstbit_step;
+ if (dstbit == 8) {
+ dst++;
+ dstbit = 0;
+ }
+ }
+ } else {
+ width /= 8;
+ while (samples-- > 0) {
+ memcpy(dst, src, width);
+ src += src_step;
+ dst += dst_step;
+ }
+ }
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff