diff options
Diffstat (limited to 'sound/core/oss/route.c')
| -rw-r--r-- | sound/core/oss/route.c | 519 |
1 files changed, 519 insertions, 0 deletions
diff --git a/sound/core/oss/route.c b/sound/core/oss/route.c new file mode 100644 index 0000000..c955b7d --- /dev/null +++ b/sound/core/oss/route.c @@ -0,0 +1,519 @@ +/* + * Attenuated route Plug-In + * 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 + * + */ + +#include <sound/driver.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include "pcm_plugin.h" + +/* The best possible hack to support missing optimization in gcc 2.7.2.3 */ +#if ROUTE_PLUGIN_RESOLUTION & (ROUTE_PLUGIN_RESOLUTION - 1) != 0 +#define div(a) a /= ROUTE_PLUGIN_RESOLUTION +#elif ROUTE_PLUGIN_RESOLUTION == 16 +#define div(a) a >>= 4 +#else +#error "Add some code here" +#endif + +typedef struct ttable_dst ttable_dst_t; +typedef struct route_private_data route_t; + +typedef void (*route_channel_f)(snd_pcm_plugin_t *plugin, + const snd_pcm_plugin_channel_t *src_channels, + snd_pcm_plugin_channel_t *dst_channel, + ttable_dst_t* ttable, snd_pcm_uframes_t frames); + +typedef struct { + int channel; + int as_int; +} ttable_src_t; + +struct ttable_dst { + int att; /* Attenuated */ + unsigned int nsrcs; + ttable_src_t* srcs; + route_channel_f func; +}; + +struct route_private_data { + enum {R_UINT32=0, R_UINT64=1} sum_type; + int get, put; + int conv; + int src_sample_size; + ttable_dst_t ttable[0]; +}; + +typedef union { + u_int32_t as_uint32; + u_int64_t as_uint64; +} sum_t; + + +static void route_to_channel_from_zero(snd_pcm_plugin_t *plugin, + const snd_pcm_plugin_channel_t *src_channels ATTRIBUTE_UNUSED, + snd_pcm_plugin_channel_t *dst_channel, + ttable_dst_t* ttable ATTRIBUTE_UNUSED, snd_pcm_uframes_t frames) +{ + if (dst_channel->wanted) + snd_pcm_area_silence(&dst_channel->area, 0, frames, plugin->dst_format.format); + dst_channel->enabled = 0; +} + +static void route_to_channel_from_one(snd_pcm_plugin_t *plugin, + const snd_pcm_plugin_channel_t *src_channels, + snd_pcm_plugin_channel_t *dst_channel, + ttable_dst_t* ttable, snd_pcm_uframes_t frames) +{ +#define CONV_LABELS +#include "plugin_ops.h" +#undef CONV_LABELS + route_t *data = (route_t *)plugin->extra_data; + void *conv; + const snd_pcm_plugin_channel_t *src_channel = NULL; + unsigned int srcidx; + char *src, *dst; + int src_step, dst_step; + for (srcidx = 0; srcidx < ttable->nsrcs; ++srcidx) { + src_channel = &src_channels[ttable->srcs[srcidx].channel]; + if (src_channel->area.addr != NULL) + break; + } + if (srcidx == ttable->nsrcs) { + route_to_channel_from_zero(plugin, src_channels, dst_channel, ttable, frames); + return; + } + + dst_channel->enabled = 1; + conv = conv_labels[data->conv]; + src = src_channel->area.addr + src_channel->area.first / 8; + src_step = src_channel->area.step / 8; + dst = dst_channel->area.addr + dst_channel->area.first / 8; + dst_step = dst_channel->area.step / 8; + while (frames-- > 0) { + goto *conv; +#define CONV_END after +#include "plugin_ops.h" +#undef CONV_END + after: + src += src_step; + dst += dst_step; + } +} + +static void route_to_channel(snd_pcm_plugin_t *plugin, + const snd_pcm_plugin_channel_t *src_channels, + snd_pcm_plugin_channel_t *dst_channel, + ttable_dst_t* ttable, snd_pcm_uframes_t frames) +{ +#define GET_U_LABELS +#define PUT_U32_LABELS +#include "plugin_ops.h" +#undef GET_U_LABELS +#undef PUT_U32_LABELS + static void *zero_labels[2] = { &&zero_int32, &&zero_int64 }; + /* sum_type att */ + static void *add_labels[2 * 2] = { &&add_int32_noatt, &&add_int32_att, + &&add_int64_noatt, &&add_int64_att, + }; + /* sum_type att shift */ + static void *norm_labels[2 * 2 * 4] = { NULL, + &&norm_int32_8_noatt, + &&norm_int32_16_noatt, + &&norm_int32_24_noatt, + NULL, + &&norm_int32_8_att, + &&norm_int32_16_att, + &&norm_int32_24_att, + &&norm_int64_0_noatt, + &&norm_int64_8_noatt, + &&norm_int64_16_noatt, + &&norm_int64_24_noatt, + &&norm_int64_0_att, + &&norm_int64_8_att, + &&norm_int64_16_att, + &&norm_int64_24_att, + }; + route_t *data = (route_t *)plugin->extra_data; + void *zero, *get, *add, *norm, *put_u32; + int nsrcs = ttable->nsrcs; + char *dst; + int dst_step; + char *srcs[nsrcs]; + int src_steps[nsrcs]; + ttable_src_t src_tt[nsrcs]; + u_int32_t sample = 0; + int srcidx, srcidx1 = 0; + for (srcidx = 0; srcidx < nsrcs; ++srcidx) { + const snd_pcm_plugin_channel_t *src_channel = &src_channels[ttable->srcs[srcidx].channel]; + if (!src_channel->enabled) + continue; + srcs[srcidx1] = src_channel->area.addr + src_channel->area.first / 8; + src_steps[srcidx1] = src_channel->area.step / 8; + src_tt[srcidx1] = ttable->srcs[srcidx]; + srcidx1++; + } + nsrcs = srcidx1; + if (nsrcs == 0) { + route_to_channel_from_zero(plugin, src_channels, dst_channel, ttable, frames); + return; + } else if (nsrcs == 1 && src_tt[0].as_int == ROUTE_PLUGIN_RESOLUTION) { + route_to_channel_from_one(plugin, src_channels, dst_channel, ttable, frames); + return; + } + + dst_channel->enabled = 1; + zero = zero_labels[data->sum_type]; + get = get_u_labels[data->get]; + add = add_labels[data->sum_type * 2 + ttable->att]; + norm = norm_labels[data->sum_type * 8 + ttable->att * 4 + 4 - data->src_sample_size]; + put_u32 = put_u32_labels[data->put]; + dst = dst_channel->area.addr + dst_channel->area.first / 8; + dst_step = dst_channel->area.step / 8; + + while (frames-- > 0) { + ttable_src_t *ttp = src_tt; + sum_t sum; + + /* Zero sum */ + goto *zero; + zero_int32: + sum.as_uint32 = 0; + goto zero_end; + zero_int64: + sum.as_uint64 = 0; + goto zero_end; + zero_end: + for (srcidx = 0; srcidx < nsrcs; ++srcidx) { + char *src = srcs[srcidx]; + + /* Get sample */ + goto *get; +#define GET_U_END after_get +#include "plugin_ops.h" +#undef GET_U_END + after_get: + + /* Sum */ + goto *add; + add_int32_att: + sum.as_uint32 += sample * ttp->as_int; + goto after_sum; + add_int32_noatt: + if (ttp->as_int) + sum.as_uint32 += sample; + goto after_sum; + add_int64_att: + sum.as_uint64 += (u_int64_t) sample * ttp->as_int; + goto after_sum; + add_int64_noatt: + if (ttp->as_int) + sum.as_uint64 += sample; + goto after_sum; + after_sum: + srcs[srcidx] += src_steps[srcidx]; + ttp++; + } + + /* Normalization */ + goto *norm; + norm_int32_8_att: + sum.as_uint64 = sum.as_uint32; + norm_int64_8_att: + sum.as_uint64 <<= 8; + norm_int64_0_att: + div(sum.as_uint64); + goto norm_int; + + norm_int32_16_att: + sum.as_uint64 = sum.as_uint32; + norm_int64_16_att: + sum.as_uint64 <<= 16; + div(sum.as_uint64); + goto norm_int; + + norm_int32_24_att: + sum.as_uint64 = sum.as_uint32; + norm_int64_24_att: + sum.as_uint64 <<= 24; + div(sum.as_uint64); + goto norm_int; + + norm_int32_8_noatt: + sum.as_uint64 = sum.as_uint32; + norm_int64_8_noatt: + sum.as_uint64 <<= 8; + goto norm_int; + + norm_int32_16_noatt: + sum.as_uint64 = sum.as_uint32; + norm_int64_16_noatt: + sum.as_uint64 <<= 16; + goto norm_int; + + norm_int32_24_noatt: + sum.as_uint64 = sum.as_uint32; + norm_int64_24_noatt: + sum.as_uint64 <<= 24; + goto norm_int; + + norm_int64_0_noatt: + norm_int: + if (sum.as_uint64 > (u_int32_t)0xffffffff) + sample = (u_int32_t)0xffffffff; + else + sample = sum.as_uint64; + goto after_norm; + + after_norm: + + /* Put sample */ + goto *put_u32; +#define PUT_U32_END after_put_u32 +#include "plugin_ops.h" +#undef PUT_U32_END + after_put_u32: + + dst += dst_step; + } +} + +static int route_src_channels_mask(snd_pcm_plugin_t *plugin, + bitset_t *dst_vmask, + bitset_t **src_vmask) +{ + route_t *data = (route_t *)plugin->extra_data; + int schannels = plugin->src_format.channels; + int dchannels = plugin->dst_format.channels; + bitset_t *vmask = plugin->src_vmask; + int channel; + ttable_dst_t *dp = data->ttable; + bitset_zero(vmask, schannels); + for (channel = 0; channel < dchannels; channel++, dp++) { + unsigned int src; + ttable_src_t *sp; + if (!bitset_get(dst_vmask, channel)) + continue; + sp = dp->srcs; + for (src = 0; src < dp->nsrcs; src++, sp++) + bitset_set(vmask, sp->channel); + } + *src_vmask = vmask; + return 0; +} + +static int route_dst_channels_mask(snd_pcm_plugin_t *plugin, + bitset_t *src_vmask, + bitset_t **dst_vmask) +{ + route_t *data = (route_t *)plugin->extra_data; + int dchannels = plugin->dst_format.channels; + bitset_t *vmask = plugin->dst_vmask; + int channel; + ttable_dst_t *dp = data->ttable; + bitset_zero(vmask, dchannels); + for (channel = 0; channel < dchannels; channel++, dp++) { + unsigned int src; + ttable_src_t *sp; + sp = dp->srcs; + for (src = 0; src < dp->nsrcs; src++, sp++) { + if (bitset_get(src_vmask, sp->channel)) { + bitset_set(vmask, channel); + break; + } + } + } + *dst_vmask = vmask; + return 0; +} + +static void route_free(snd_pcm_plugin_t *plugin) +{ + route_t *data = (route_t *)plugin->extra_data; + unsigned int dst_channel; + for (dst_channel = 0; dst_channel < plugin->dst_format.channels; ++dst_channel) { + kfree(data->ttable[dst_channel].srcs); + } +} + +static int route_load_ttable(snd_pcm_plugin_t *plugin, + const route_ttable_entry_t* src_ttable) +{ + route_t *data; + unsigned int src_channel, dst_channel; + const route_ttable_entry_t *sptr; + ttable_dst_t *dptr; + if (src_ttable == NULL) + return 0; + data = (route_t *)plugin->extra_data; + dptr = data->ttable; + sptr = src_ttable; + plugin->private_free = route_free; + for (dst_channel = 0; dst_channel < plugin->dst_format.channels; ++dst_channel) { + route_ttable_entry_t t = 0; + int att = 0; + int nsrcs = 0; + ttable_src_t srcs[plugin->src_format.channels]; + for (src_channel = 0; src_channel < plugin->src_format.channels; ++src_channel) { + snd_assert(*sptr >= 0 || *sptr <= FULL, return -ENXIO); + if (*sptr != 0) { + srcs[nsrcs].channel = src_channel; + srcs[nsrcs].as_int = *sptr; + if (*sptr != FULL) + att = 1; + t += *sptr; + nsrcs++; + } + sptr++; + } + dptr->att = att; + dptr->nsrcs = nsrcs; + if (nsrcs == 0) + dptr->func = route_to_channel_from_zero; + else if (nsrcs == 1 && !att) + dptr->func = route_to_channel_from_one; + else + dptr->func = route_to_channel; + if (nsrcs > 0) { + int srcidx; + dptr->srcs = kcalloc(nsrcs, sizeof(*srcs), GFP_KERNEL); + for(srcidx = 0; srcidx < nsrcs; srcidx++) + dptr->srcs[srcidx] = srcs[srcidx]; + } else + dptr->srcs = NULL; + dptr++; + } + return 0; +} + +static snd_pcm_sframes_t route_transfer(snd_pcm_plugin_t *plugin, + const snd_pcm_plugin_channel_t *src_channels, + snd_pcm_plugin_channel_t *dst_channels, + snd_pcm_uframes_t frames) +{ + route_t *data; + int src_nchannels, dst_nchannels; + int dst_channel; + ttable_dst_t *ttp; + snd_pcm_plugin_channel_t *dvp; + + snd_assert(plugin != NULL && src_channels != NULL && dst_channels != NULL, return -ENXIO); + if (frames == 0) + return 0; + data = (route_t *)plugin->extra_data; + + src_nchannels = plugin->src_format.channels; + dst_nchannels = plugin->dst_format.channels; + +#ifdef CONFIG_SND_DEBUG + { + int src_channel; + for (src_channel = 0; src_channel < src_nchannels; ++src_channel) { + snd_assert(src_channels[src_channel].area.first % 8 == 0 || + src_channels[src_channel].area.step % 8 == 0, + return -ENXIO); + } + for (dst_channel = 0; dst_channel < dst_nchannels; ++dst_channel) { + snd_assert(dst_channels[dst_channel].area.first % 8 == 0 || + dst_channels[dst_channel].area.step % 8 == 0, + return -ENXIO); + } + } +#endif + + ttp = data->ttable; + dvp = dst_channels; + for (dst_channel = 0; dst_channel < dst_nchannels; ++dst_channel) { + ttp->func(plugin, src_channels, dvp, ttp, frames); + dvp++; + ttp++; + } + return frames; +} + +int getput_index(int format) +{ + int sign, width, endian; + sign = !snd_pcm_format_signed(format); + width = snd_pcm_format_width(format) / 8 - 1; + if (width < 0 || width > 3) { + snd_printk(KERN_ERR "snd-pcm-oss: invalid format %d\n", format); + width = 0; + } +#ifdef SNDRV_LITTLE_ENDIAN + endian = snd_pcm_format_big_endian(format); +#else + endian = snd_pcm_format_little_endian(format); +#endif + if (endian < 0) + endian = 0; + return width * 4 + endian * 2 + sign; +} + +int snd_pcm_plugin_build_route(snd_pcm_plug_t *plug, + snd_pcm_plugin_format_t *src_format, + snd_pcm_plugin_format_t *dst_format, + route_ttable_entry_t *ttable, + snd_pcm_plugin_t **r_plugin) +{ + route_t *data; + snd_pcm_plugin_t *plugin; + int err; + + snd_assert(r_plugin != NULL, return -ENXIO); + *r_plugin = NULL; + snd_assert(src_format->rate == dst_format->rate, return -ENXIO); + snd_assert(snd_pcm_format_linear(src_format->format) != 0 && + snd_pcm_format_linear(dst_format->format) != 0, + return -ENXIO); + + err = snd_pcm_plugin_build(plug, "attenuated route conversion", + src_format, dst_format, + sizeof(route_t) + sizeof(data->ttable[0]) * dst_format->channels, + &plugin); + if (err < 0) + return err; + + data = (route_t *) plugin->extra_data; + + data->get = getput_index(src_format->format); + snd_assert(data->get >= 0 && data->get < 4*2*2, return -EINVAL); + data->put = getput_index(dst_format->format); + snd_assert(data->get >= 0 && data->get < 4*2*2, return -EINVAL); + data->conv = conv_index(src_format->format, dst_format->format); + + if (snd_pcm_format_width(src_format->format) == 32) + data->sum_type = R_UINT64; + else + data->sum_type = R_UINT32; + data->src_sample_size = snd_pcm_format_width(src_format->format) / 8; + + if ((err = route_load_ttable(plugin, ttable)) < 0) { + snd_pcm_plugin_free(plugin); + return err; + } + plugin->transfer = route_transfer; + plugin->src_channels_mask = route_src_channels_mask; + plugin->dst_channels_mask = route_dst_channels_mask; + *r_plugin = plugin; + return 0; +} |