From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- sound/core/oss/route.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 sound/core/oss/route.c (limited to 'sound/core/oss/route.c') diff --git a/sound/core/oss/route.c b/sound/core/oss/route.c new file mode 100644 index 000000000..72dea0419 --- /dev/null +++ b/sound/core/oss/route.c @@ -0,0 +1,111 @@ +/* + * 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 +#include +#include +#include "pcm_plugin.h" + +static void zero_areas(struct snd_pcm_plugin_channel *dvp, int ndsts, + snd_pcm_uframes_t frames, snd_pcm_format_t format) +{ + int dst = 0; + for (; dst < ndsts; ++dst) { + if (dvp->wanted) + snd_pcm_area_silence(&dvp->area, 0, frames, format); + dvp->enabled = 0; + dvp++; + } +} + +static inline void copy_area(const struct snd_pcm_plugin_channel *src_channel, + struct snd_pcm_plugin_channel *dst_channel, + snd_pcm_uframes_t frames, snd_pcm_format_t format) +{ + dst_channel->enabled = 1; + snd_pcm_area_copy(&src_channel->area, 0, &dst_channel->area, 0, frames, format); +} + +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) +{ + int nsrcs, ndsts, dst; + struct snd_pcm_plugin_channel *dvp; + snd_pcm_format_t format; + + if (snd_BUG_ON(!plugin || !src_channels || !dst_channels)) + return -ENXIO; + if (frames == 0) + return 0; + if (frames > dst_channels[0].frames) + frames = dst_channels[0].frames; + + nsrcs = plugin->src_format.channels; + ndsts = plugin->dst_format.channels; + + format = plugin->dst_format.format; + dvp = dst_channels; + if (nsrcs <= 1) { + /* expand to all channels */ + for (dst = 0; dst < ndsts; ++dst) { + copy_area(src_channels, dvp, frames, format); + dvp++; + } + return frames; + } + + for (dst = 0; dst < ndsts && dst < nsrcs; ++dst) { + copy_area(src_channels, dvp, frames, format); + dvp++; + src_channels++; + } + if (dst < ndsts) + zero_areas(dvp, ndsts - dst, frames, format); + return frames; +} + +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, + struct snd_pcm_plugin **r_plugin) +{ + struct snd_pcm_plugin *plugin; + int err; + + if (snd_BUG_ON(!r_plugin)) + return -ENXIO; + *r_plugin = NULL; + if (snd_BUG_ON(src_format->rate != dst_format->rate)) + return -ENXIO; + if (snd_BUG_ON(src_format->format != dst_format->format)) + return -ENXIO; + + err = snd_pcm_plugin_build(plug, "route conversion", + src_format, dst_format, 0, &plugin); + if (err < 0) + return err; + + plugin->transfer = route_transfer; + *r_plugin = plugin; + return 0; +} -- cgit v1.2.3