diff options
Diffstat (limited to 'sound/core/oss/pcm_plugin.c')
| -rw-r--r-- | sound/core/oss/pcm_plugin.c | 921 |
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 000000000000..6bb31009f0b4 --- /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; +} |