/* * Attenuated route Plug-In * Copyright (c) 2000 by Abramo Bagnara * * * 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 #ifdef CONFIG_SND_PCM_OSS_PLUGINS #include #include #include #include #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 struct ttable_dst; typedef void (*route_channel_f)(struct snd_pcm_plugin *plugin, const struct snd_pcm_plugin_channel *src_channels, struct snd_pcm_plugin_channel *dst_channel, struct ttable_dst *ttable, snd_pcm_uframes_t frames); struct ttable_src { int channel; int as_int; }; struct ttable_dst { int att; /* Attenuated */ unsigned int nsrcs; struct ttable_src *srcs; route_channel_f func; }; struct route_priv { enum {R_UINT32=0, R_UINT64=1} sum_type; int get, put; int conv; int src_sample_size; struct ttable_dst ttable[0]; }; union sum { u_int32_t as_uint32; u_int64_t as_uint64; }; static void route_to_channel_from_zero(struct snd_pcm_plugin *plugin, const struct snd_pcm_plugin_channel *src_channels, struct snd_pcm_plugin_channel *dst_channel, struct ttable_dst *ttable, 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(struct snd_pcm_plugin *plugin, const struct snd_pcm_plugin_channel *src_channels, struct snd_pcm_plugin_channel *dst_channel, struct ttable_dst *ttable, snd_pcm_uframes_t frames) { #define CONV_LABELS #include "plugin_ops.h" #undef CONV_LABELS struct route_priv *data = (struct route_priv *)plugin->extra_data; void *conv; const struct snd_pcm_plugin_channel *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(struct snd_pcm_plugin *plugin, const struct snd_pcm_plugin_channel *src_channels, struct snd_pcm_plugin_channel *dst_channel, struct ttable_dst *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, }; struct route_priv *data = (struct route_priv *)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]; struct ttable_src src_tt[nsrcs]; u_int32_t sample = 0; int srcidx, srcidx1 = 0; for (srcidx = 0; srcidx < nsrcs; ++srcidx) { const struct snd_pcm_plugin_channel *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) { struct ttable_src *ttp = src_tt; union sum 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(struct snd_pcm_plugin *plugin, unsigned long *dst_vmask, unsigned long **src_vmask) { struct route_priv *data = (struct route_priv *)plugin->extra_data; int schannels = plugin->src_format.channels; int dchannels = plugin->dst_format.channels; unsigned long *vmask = plugin->src_vmask; int channel; struct ttable_dst *dp = data->ttable; bitmap_zero(vmask, schannels); for (channel = 0; channel < dchannels; channel++, dp++) { unsigned int src; struct ttable_src *sp; if (!test_bit(channel, dst_vmask)) continue; sp = dp->srcs; for (src = 0; src < dp->nsrcs; src++, sp++) set_bit(sp->channel, vmask); } *src_vmask = vmask; return 0; } static int route_dst_channels_mask(struct snd_pcm_plugin *plugin, unsigned long *src_vmask, unsigned long **dst_vmask) { struct route_priv *data = (struct route_priv *)plugin->extra_data; int dchannels = plugin->dst_format.channels; unsigned long *vmask = plugin->dst_vmask; int channel; struct ttable_dst *dp = data->ttable; bitmap_zero(vmask, dchannels); for (channel = 0; channel < dchannels; channel++, dp++) { unsigned int src; struct ttable_src *sp; sp = dp->srcs; for (src = 0; src < dp->nsrcs; src++, sp++) { if (test_bit(sp->channel, src_vmask)) { set_bit(channel, vmask); break; } } } *dst_vmask = vmask; return 0; } static void route_free(struct snd_pcm_plugin *plugin) { struct route_priv *data = (struct route_priv *)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(struct snd_pcm_plugin *plugin, const int *src_ttable) { struct route_priv *data; unsigned int src_channel, dst_channel; const int *sptr; struct ttable_dst *dptr; if (src_ttable == NULL) return 0; data = (struct route_priv *)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) { int t = 0; int att = 0; int nsrcs = 0; struct ttable_src 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(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) { struct route_priv *data; int src_nchannels, dst_nchannels; int dst_channel; struct ttable_dst *ttp; struct snd_pcm_plugin_channel *dvp; snd_assert(plugin != NULL && src_channels != NULL && dst_channels != NULL, return -ENXIO); if (frames == 0) return 0; data = (struct route_priv *)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(struct snd_pcm_substream *plug, struct snd_pcm_plugin_format *src_format, struct snd_pcm_plugin_format *dst_format, int *ttable, struct snd_pcm_plugin **r_plugin) { struct route_priv *data; struct snd_pcm_plugin *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(struct route_priv) + sizeof(data->ttable[0]) * dst_format->channels, &plugin); if (err < 0) return err; data = (struct route_priv *)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; } #endif