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-rw-r--r--sound/core/oss/pcm_plugin.c921
1 files changed, 921 insertions, 0 deletions
diff --git a/sound/core/oss/pcm_plugin.c b/sound/core/oss/pcm_plugin.c
new file mode 100644
index 00000000000..6bb31009f0b
--- /dev/null
+++ b/sound/core/oss/pcm_plugin.c
@@ -0,0 +1,921 @@
+/*
+ * PCM Plug-In shared (kernel/library) code
+ * Copyright (c) 1999 by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
+#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)
+
+static int snd_pcm_plugin_src_channels_mask(snd_pcm_plugin_t *plugin,
+ bitset_t *dst_vmask,
+ bitset_t **src_vmask)
+{
+ bitset_t *vmask = plugin->src_vmask;
+ bitset_copy(vmask, dst_vmask, plugin->src_format.channels);
+ *src_vmask = vmask;
+ return 0;
+}
+
+static int snd_pcm_plugin_dst_channels_mask(snd_pcm_plugin_t *plugin,
+ bitset_t *src_vmask,
+ bitset_t **dst_vmask)
+{
+ bitset_t *vmask = plugin->dst_vmask;
+ bitset_copy(vmask, src_vmask, plugin->dst_format.channels);
+ *dst_vmask = vmask;
+ return 0;
+}
+
+/*
+ * 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(snd_pcm_plugin_t *plugin, snd_pcm_uframes_t frames)
+{
+ snd_pcm_plugin_format_t *format;
+ ssize_t width;
+ size_t size;
+ unsigned int channel;
+ snd_pcm_plugin_channel_t *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;
+ snd_assert((size % 8) == 0, 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) {
+ snd_assert((size % format->channels) == 0,);
+ 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(snd_pcm_plug_t *plug, snd_pcm_uframes_t frames)
+{
+ int err;
+ snd_assert(snd_pcm_plug_first(plug) != NULL, return -ENXIO);
+ if (snd_pcm_plug_stream(plug) == SNDRV_PCM_STREAM_PLAYBACK) {
+ snd_pcm_plugin_t *plugin = snd_pcm_plug_first(plug);
+ while (plugin->next) {
+ if (plugin->dst_frames)
+ frames = plugin->dst_frames(plugin, frames);
+ snd_assert(frames > 0, return -ENXIO);
+ plugin = plugin->next;
+ err = snd_pcm_plugin_alloc(plugin, frames);
+ if (err < 0)
+ return err;
+ }
+ } else {
+ snd_pcm_plugin_t *plugin = snd_pcm_plug_last(plug);
+ while (plugin->prev) {
+ if (plugin->src_frames)
+ frames = plugin->src_frames(plugin, frames);
+ snd_assert(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(snd_pcm_plugin_t *plugin,
+ snd_pcm_uframes_t frames,
+ snd_pcm_plugin_channel_t **channels)
+{
+ *channels = plugin->buf_channels;
+ return frames;
+}
+
+int snd_pcm_plugin_build(snd_pcm_plug_t *plug,
+ const char *name,
+ snd_pcm_plugin_format_t *src_format,
+ snd_pcm_plugin_format_t *dst_format,
+ size_t extra,
+ snd_pcm_plugin_t **ret)
+{
+ snd_pcm_plugin_t *plugin;
+ unsigned int channels;
+
+ snd_assert(plug != NULL, return -ENXIO);
+ snd_assert(src_format != NULL && dst_format != NULL, return -ENXIO);
+ plugin = kcalloc(1, 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_assert(plugin->src_width > 0, );
+ plugin->dst_format = *dst_format;
+ plugin->dst_width = snd_pcm_format_physical_width(dst_format->format);
+ snd_assert(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->src_vmask = bitset_alloc(src_format->channels);
+ if (plugin->src_vmask == NULL) {
+ snd_pcm_plugin_free(plugin);
+ return -ENOMEM;
+ }
+ plugin->dst_vmask = bitset_alloc(dst_format->channels);
+ if (plugin->dst_vmask == NULL) {
+ snd_pcm_plugin_free(plugin);
+ return -ENOMEM;
+ }
+ plugin->client_channels = snd_pcm_plugin_client_channels;
+ plugin->src_channels_mask = snd_pcm_plugin_src_channels_mask;
+ plugin->dst_channels_mask = snd_pcm_plugin_dst_channels_mask;
+ *ret = plugin;
+ return 0;
+}
+
+int snd_pcm_plugin_free(snd_pcm_plugin_t *plugin)
+{
+ if (! plugin)
+ return 0;
+ if (plugin->private_free)
+ plugin->private_free(plugin);
+ kfree(plugin->buf_channels);
+ vfree(plugin->buf);
+ kfree(plugin->src_vmask);
+ kfree(plugin->dst_vmask);
+ kfree(plugin);
+ return 0;
+}
+
+snd_pcm_sframes_t snd_pcm_plug_client_size(snd_pcm_plug_t *plug, snd_pcm_uframes_t drv_frames)
+{
+ snd_pcm_plugin_t *plugin, *plugin_prev, *plugin_next;
+ int stream = snd_pcm_plug_stream(plug);
+
+ snd_assert(plug != NULL, return -ENXIO);
+ if (drv_frames == 0)
+ return 0;
+ 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(snd_pcm_plug_t *plug, snd_pcm_uframes_t clt_frames)
+{
+ snd_pcm_plugin_t *plugin, *plugin_prev, *plugin_next;
+ snd_pcm_sframes_t frames;
+ int stream = snd_pcm_plug_stream(plug);
+
+ snd_assert(plug != NULL, return -ENXIO);
+ if (clt_frames == 0)
+ return 0;
+ frames = clt_frames;
+ 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(snd_mask_t *mask, int format)
+{
+ snd_mask_t 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_U32_LE | SNDRV_PCM_FMTBIT_S32_LE |
+ SNDRV_PCM_FMTBIT_U32_BE | SNDRV_PCM_FMTBIT_S32_BE);
+ snd_mask_set(&formats, 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, format);
+}
+
+static int 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_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
+};
+
+int snd_pcm_plug_slave_format(int format, snd_mask_t *format_mask)
+{
+ if (snd_mask_test(format_mask, format))
+ return format;
+ if (! snd_pcm_plug_formats(format_mask, format))
+ return -EINVAL;
+ if (snd_pcm_format_linear(format)) {
+ int width = snd_pcm_format_width(format);
+ int unsignd = snd_pcm_format_unsigned(format);
+ int big = snd_pcm_format_big_endian(format);
+ int format1;
+ int wid, width1=width;
+ int dwidth1 = 8;
+ for (wid = 0; wid < 4; ++wid) {
+ int end, big1 = big;
+ for (end = 0; end < 2; ++end) {
+ int sgn, unsignd1 = unsignd;
+ for (sgn = 0; sgn < 2; ++sgn) {
+ format1 = snd_pcm_build_linear_format(width1, unsignd1, big1);
+ if (format1 >= 0 &&
+ snd_mask_test(format_mask, format1))
+ goto _found;
+ unsignd1 = !unsignd1;
+ }
+ big1 = !big1;
+ }
+ if (width1 == 32) {
+ dwidth1 = -dwidth1;
+ width1 = width;
+ }
+ width1 += dwidth1;
+ }
+ return -EINVAL;
+ _found:
+ return format1;
+ } else {
+ unsigned int i;
+ switch (format) {
+ case SNDRV_PCM_FORMAT_MU_LAW:
+ for (i = 0; i < ARRAY_SIZE(preferred_formats); ++i) {
+ int format1 = preferred_formats[i];
+ if (snd_mask_test(format_mask, format1))
+ return format1;
+ }
+ default:
+ return -EINVAL;
+ }
+ }
+}
+
+int snd_pcm_plug_format_plugins(snd_pcm_plug_t *plug,
+ snd_pcm_hw_params_t *params,
+ snd_pcm_hw_params_t *slave_params)
+{
+ snd_pcm_plugin_format_t tmpformat;
+ snd_pcm_plugin_format_t dstformat;
+ snd_pcm_plugin_format_t srcformat;
+ int src_access, dst_access;
+ snd_pcm_plugin_t *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 ((srcformat.format != dstformat.format ||
+ !rate_match(srcformat.rate, dstformat.rate) ||
+ srcformat.channels != dstformat.channels) &&
+ !snd_pcm_format_linear(srcformat.format)) {
+ if (snd_pcm_format_linear(dstformat.format))
+ tmpformat.format = dstformat.format;
+ else
+ tmpformat.format = SNDRV_PCM_FORMAT_S16;
+ switch (srcformat.format) {
+ case SNDRV_PCM_FORMAT_MU_LAW:
+ err = snd_pcm_plugin_build_mulaw(plug,
+ &srcformat, &tmpformat,
+ &plugin);
+ break;
+ default:
+ 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 reduction */
+ if (srcformat.channels > dstformat.channels) {
+ int sv = srcformat.channels;
+ int dv = dstformat.channels;
+ route_ttable_entry_t *ttable = kcalloc(dv * sv, sizeof(*ttable), GFP_KERNEL);
+ if (ttable == NULL)
+ return -ENOMEM;
+#if 1
+ if (sv == 2 && dv == 1) {
+ ttable[0] = HALF;
+ ttable[1] = HALF;
+ } else
+#endif
+ {
+ int v;
+ for (v = 0; v < dv; ++v)
+ ttable[v * sv + v] = FULL;
+ }
+ tmpformat.channels = dstformat.channels;
+ if (rate_match(srcformat.rate, dstformat.rate) &&
+ snd_pcm_format_linear(dstformat.format))
+ tmpformat.format = dstformat.format;
+ err = snd_pcm_plugin_build_route(plug,
+ &srcformat, &tmpformat,
+ ttable, &plugin);
+ kfree(ttable);
+ pdprintf("channels reduction: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
+ if (err < 0) {
+ snd_pcm_plugin_free(plugin);
+ 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)) {
+ tmpformat.rate = dstformat.rate;
+ if (srcformat.channels == dstformat.channels &&
+ snd_pcm_format_linear(dstformat.format))
+ tmpformat.format = dstformat.format;
+ 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) {
+ snd_pcm_plugin_free(plugin);
+ 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) {
+ int sv = srcformat.channels;
+ int dv = dstformat.channels;
+ route_ttable_entry_t *ttable = kcalloc(dv * sv, sizeof(*ttable), GFP_KERNEL);
+ if (ttable == NULL)
+ return -ENOMEM;
+#if 0
+ {
+ int v;
+ for (v = 0; v < sv; ++v)
+ ttable[v * sv + v] = FULL;
+ }
+#else
+ {
+ /* Playback is spreaded on all channels */
+ int vd, vs;
+ for (vd = 0, vs = 0; vd < dv; ++vd) {
+ ttable[vd * sv + vs] = FULL;
+ vs++;
+ if (vs == sv)
+ vs = 0;
+ }
+ }
+#endif
+ tmpformat.channels = dstformat.channels;
+ if (snd_pcm_format_linear(dstformat.format))
+ tmpformat.format = dstformat.format;
+ err = snd_pcm_plugin_build_route(plug,
+ &srcformat, &tmpformat,
+ ttable, &plugin);
+ kfree(ttable);
+ pdprintf("channels extension: src=%i, dst=%i returns %i\n", srcformat.channels, tmpformat.channels, err);
+ if (err < 0) {
+ snd_pcm_plugin_free(plugin);
+ 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 (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;
+ }
+
+ /* 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(snd_pcm_plug_t *plug,
+ char *buf,
+ snd_pcm_uframes_t count,
+ snd_pcm_plugin_channel_t **channels)
+{
+ snd_pcm_plugin_t *plugin;
+ snd_pcm_plugin_channel_t *v;
+ snd_pcm_plugin_format_t *format;
+ int width, nchannels, channel;
+ int stream = snd_pcm_plug_stream(plug);
+
+ snd_assert(buf != NULL, 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;
+ snd_assert(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;
+}
+
+static int snd_pcm_plug_playback_channels_mask(snd_pcm_plug_t *plug,
+ bitset_t *client_vmask)
+{
+ snd_pcm_plugin_t *plugin = snd_pcm_plug_last(plug);
+ if (plugin == NULL) {
+ return 0;
+ } else {
+ int schannels = plugin->dst_format.channels;
+ bitset_t bs[bitset_size(schannels)];
+ bitset_t *srcmask;
+ bitset_t *dstmask = bs;
+ int err;
+ bitset_one(dstmask, schannels);
+ if (plugin == NULL) {
+ bitset_and(client_vmask, dstmask, schannels);
+ return 0;
+ }
+ while (1) {
+ err = plugin->src_channels_mask(plugin, dstmask, &srcmask);
+ if (err < 0)
+ return err;
+ dstmask = srcmask;
+ if (plugin->prev == NULL)
+ break;
+ plugin = plugin->prev;
+ }
+ bitset_and(client_vmask, dstmask, plugin->src_format.channels);
+ return 0;
+ }
+}
+
+static int snd_pcm_plug_playback_disable_useless_channels(snd_pcm_plug_t *plug,
+ snd_pcm_plugin_channel_t *src_channels)
+{
+ snd_pcm_plugin_t *plugin = snd_pcm_plug_first(plug);
+ unsigned int nchannels = plugin->src_format.channels;
+ bitset_t bs[bitset_size(nchannels)];
+ bitset_t *srcmask = bs;
+ int err;
+ unsigned int channel;
+ for (channel = 0; channel < nchannels; channel++) {
+ if (src_channels[channel].enabled)
+ bitset_set(srcmask, channel);
+ else
+ bitset_reset(srcmask, channel);
+ }
+ err = snd_pcm_plug_playback_channels_mask(plug, srcmask);
+ if (err < 0)
+ return err;
+ for (channel = 0; channel < nchannels; channel++) {
+ if (!bitset_get(srcmask, channel))
+ src_channels[channel].enabled = 0;
+ }
+ return 0;
+}
+
+static int snd_pcm_plug_capture_disable_useless_channels(snd_pcm_plug_t *plug,
+ snd_pcm_plugin_channel_t *src_channels,
+ snd_pcm_plugin_channel_t *client_channels)
+{
+ snd_pcm_plugin_t *plugin = snd_pcm_plug_last(plug);
+ unsigned int nchannels = plugin->dst_format.channels;
+ bitset_t bs[bitset_size(nchannels)];
+ bitset_t *dstmask = bs;
+ bitset_t *srcmask;
+ int err;
+ unsigned int channel;
+ for (channel = 0; channel < nchannels; channel++) {
+ if (client_channels[channel].enabled)
+ bitset_set(dstmask, channel);
+ else
+ bitset_reset(dstmask, channel);
+ }
+ while (plugin) {
+ err = plugin->src_channels_mask(plugin, dstmask, &srcmask);
+ if (err < 0)
+ return err;
+ dstmask = srcmask;
+ plugin = plugin->prev;
+ }
+ plugin = snd_pcm_plug_first(plug);
+ nchannels = plugin->src_format.channels;
+ for (channel = 0; channel < nchannels; channel++) {
+ if (!bitset_get(dstmask, channel))
+ src_channels[channel].enabled = 0;
+ }
+ return 0;
+}
+
+snd_pcm_sframes_t snd_pcm_plug_write_transfer(snd_pcm_plug_t *plug, snd_pcm_plugin_channel_t *src_channels, snd_pcm_uframes_t size)
+{
+ snd_pcm_plugin_t *plugin, *next;
+ snd_pcm_plugin_channel_t *dst_channels;
+ int err;
+ snd_pcm_sframes_t frames = size;
+
+ if ((err = snd_pcm_plug_playback_disable_useless_channels(plug, src_channels)) < 0)
+ return err;
+
+ 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(snd_pcm_plug_t *plug, snd_pcm_plugin_channel_t *dst_channels_final, snd_pcm_uframes_t size)
+{
+ snd_pcm_plugin_t *plugin, *next;
+ snd_pcm_plugin_channel_t *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;
+ if (!plugin->prev) {
+ if ((err = snd_pcm_plug_capture_disable_useless_channels(plug, dst_channels, dst_channels_final)) < 0)
+ return 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 snd_pcm_channel_area_t *dst_area, size_t dst_offset,
+ size_t samples, int 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 snd_pcm_channel_area_t *src_area, size_t src_offset,
+ const snd_pcm_channel_area_t *dst_area, size_t dst_offset,
+ size_t samples, int 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;
+}