diff options
Diffstat (limited to 'ANDROID_3.4.5/sound/core/oss/linear.c')
| -rw-r--r-- | ANDROID_3.4.5/sound/core/oss/linear.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/ANDROID_3.4.5/sound/core/oss/linear.c b/ANDROID_3.4.5/sound/core/oss/linear.c deleted file mode 100644 index 2045697f..00000000 --- a/ANDROID_3.4.5/sound/core/oss/linear.c +++ /dev/null @@ -1,178 +0,0 @@ -/* - * Linear conversion Plug-In - * Copyright (c) 1999 by Jaroslav Kysela <perex@perex.cz>, - * 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 <linux/time.h> -#include <sound/core.h> -#include <sound/pcm.h> -#include "pcm_plugin.h" - -/* - * Basic linear conversion plugin - */ - -struct linear_priv { - int cvt_endian; /* need endian conversion? */ - unsigned int src_ofs; /* byte offset in source format */ - unsigned int dst_ofs; /* byte soffset in destination format */ - unsigned int copy_ofs; /* byte offset in temporary u32 data */ - unsigned int dst_bytes; /* byte size of destination format */ - unsigned int copy_bytes; /* bytes to copy per conversion */ - unsigned int flip; /* MSB flip for signeness, done after endian conv */ -}; - -static inline void do_convert(struct linear_priv *data, - unsigned char *dst, unsigned char *src) -{ - unsigned int tmp = 0; - unsigned char *p = (unsigned char *)&tmp; - - memcpy(p + data->copy_ofs, src + data->src_ofs, data->copy_bytes); - if (data->cvt_endian) - tmp = swab32(tmp); - tmp ^= data->flip; - memcpy(dst, p + data->dst_ofs, data->dst_bytes); -} - -static void convert(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 linear_priv *data = (struct linear_priv *)plugin->extra_data; - int channel; - int nchannels = plugin->src_format.channels; - for (channel = 0; channel < nchannels; ++channel) { - char *src; - char *dst; - int src_step, dst_step; - snd_pcm_uframes_t frames1; - if (!src_channels[channel].enabled) { - if (dst_channels[channel].wanted) - snd_pcm_area_silence(&dst_channels[channel].area, 0, frames, plugin->dst_format.format); - dst_channels[channel].enabled = 0; - continue; - } - dst_channels[channel].enabled = 1; - src = src_channels[channel].area.addr + src_channels[channel].area.first / 8; - dst = dst_channels[channel].area.addr + dst_channels[channel].area.first / 8; - src_step = src_channels[channel].area.step / 8; - dst_step = dst_channels[channel].area.step / 8; - frames1 = frames; - while (frames1-- > 0) { - do_convert(data, dst, src); - src += src_step; - dst += dst_step; - } - } -} - -static snd_pcm_sframes_t linear_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) -{ - if (snd_BUG_ON(!plugin || !src_channels || !dst_channels)) - return -ENXIO; - if (frames == 0) - return 0; -#ifdef CONFIG_SND_DEBUG - { - unsigned int channel; - for (channel = 0; channel < plugin->src_format.channels; channel++) { - if (snd_BUG_ON(src_channels[channel].area.first % 8 || - src_channels[channel].area.step % 8)) - return -ENXIO; - if (snd_BUG_ON(dst_channels[channel].area.first % 8 || - dst_channels[channel].area.step % 8)) - return -ENXIO; - } - } -#endif - convert(plugin, src_channels, dst_channels, frames); - return frames; -} - -static void init_data(struct linear_priv *data, - snd_pcm_format_t src_format, snd_pcm_format_t dst_format) -{ - int src_le, dst_le, src_bytes, dst_bytes; - - src_bytes = snd_pcm_format_width(src_format) / 8; - dst_bytes = snd_pcm_format_width(dst_format) / 8; - src_le = snd_pcm_format_little_endian(src_format) > 0; - dst_le = snd_pcm_format_little_endian(dst_format) > 0; - - data->dst_bytes = dst_bytes; - data->cvt_endian = src_le != dst_le; - data->copy_bytes = src_bytes < dst_bytes ? src_bytes : dst_bytes; - if (src_le) { - data->copy_ofs = 4 - data->copy_bytes; - data->src_ofs = src_bytes - data->copy_bytes; - } else - data->src_ofs = snd_pcm_format_physical_width(src_format) / 8 - - src_bytes; - if (dst_le) - data->dst_ofs = 4 - data->dst_bytes; - else - data->dst_ofs = snd_pcm_format_physical_width(dst_format) / 8 - - dst_bytes; - if (snd_pcm_format_signed(src_format) != - snd_pcm_format_signed(dst_format)) { - if (dst_le) - data->flip = (__force u32)cpu_to_le32(0x80000000); - else - data->flip = (__force u32)cpu_to_be32(0x80000000); - } -} - -int snd_pcm_plugin_build_linear(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) -{ - int err; - struct linear_priv *data; - struct snd_pcm_plugin *plugin; - - 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->channels != dst_format->channels)) - return -ENXIO; - if (snd_BUG_ON(!snd_pcm_format_linear(src_format->format) || - !snd_pcm_format_linear(dst_format->format))) - return -ENXIO; - - err = snd_pcm_plugin_build(plug, "linear format conversion", - src_format, dst_format, - sizeof(struct linear_priv), &plugin); - if (err < 0) - return err; - data = (struct linear_priv *)plugin->extra_data; - init_data(data, src_format->format, dst_format->format); - plugin->transfer = linear_transfer; - *r_plugin = plugin; - return 0; -} |