mirror of
https://github.com/alsa-project/alsa-lib.git
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Initial (not working) version
This commit is contained in:
Jaroslav Kysela
parent
dcc691073e
commit
72a221be2c
1 changed files with 377 additions and 0 deletions
377
src/pcm/pcm_lfloat.c
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377
src/pcm/pcm_lfloat.c
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/*
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* PCM - Linear Integer <-> Linear Float conversion
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* Copyright (c) 2001 by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Library General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <byteswap.h>
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#include "pcm_local.h"
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#include "pcm_plugin.h"
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#ifndef PIC
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/* entry for static linking */
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const char *_snd_module_pcm_float = "";
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#endif
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typedef struct {
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/* This field need to be the first */
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snd_pcm_plugin_t plug;
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unsigned int conv_idx;
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snd_pcm_format_t sformat;
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} snd_pcm_lfloat_t;
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int snd_pcm_lfloat_convert_index(snd_pcm_format_t src_format,
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snd_pcm_format_t dst_format)
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{
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int src_endian, dst_endian, sign, src_width, dst_width;
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sign = (snd_pcm_format_signed(src_format) !=
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snd_pcm_format_signed(dst_format));
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#ifdef SND_LITTLE_ENDIAN
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src_endian = snd_pcm_format_big_endian(src_format);
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dst_endian = snd_pcm_format_big_endian(dst_format);
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#else
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src_endian = snd_pcm_format_little_endian(src_format);
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dst_endian = snd_pcm_format_little_endian(dst_format);
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#endif
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if (src_endian < 0)
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src_endian = 0;
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if (dst_endian < 0)
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dst_endian = 0;
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src_width = snd_pcm_format_width(src_format) / 8 - 1;
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dst_width = snd_pcm_format_width(dst_format) / 8 - 1;
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return src_width * 32 + src_endian * 16 + sign * 8 + dst_width * 2 + dst_endian;
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}
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int snd_pcm_lfloat_get_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format)
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{
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int sign, width, endian;
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sign = (snd_pcm_format_signed(src_format) !=
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snd_pcm_format_signed(dst_format));
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width = snd_pcm_format_width(src_format) / 8 - 1;
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#ifdef SND_LITTLE_ENDIAN
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endian = snd_pcm_format_big_endian(src_format);
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#else
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endian = snd_pcm_format_little_endian(src_format);
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#endif
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if (endian < 0)
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endian = 0;
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return width * 4 + endian * 2 + sign;
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}
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int snd_pcm_lfloat_put_index(snd_pcm_format_t src_format, snd_pcm_format_t dst_format)
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{
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int sign, width, endian;
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sign = (snd_pcm_format_signed(src_format) !=
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snd_pcm_format_signed(dst_format));
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width = snd_pcm_format_width(dst_format) / 8 - 1;
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#ifdef SND_LITTLE_ENDIAN
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endian = snd_pcm_format_big_endian(dst_format);
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#else
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endian = snd_pcm_format_little_endian(dst_format);
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#endif
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if (endian < 0)
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endian = 0;
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return width * 4 + endian * 2 + sign;
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}
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void snd_pcm_lfloat_convert(const snd_pcm_channel_area_t *dst_areas, snd_pcm_uframes_t dst_offset,
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const snd_pcm_channel_area_t *src_areas, snd_pcm_uframes_t src_offset,
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unsigned int channels, snd_pcm_uframes_t frames,
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unsigned int convidx)
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{
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#define CONV_LABELS
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#include "plugin_ops.h"
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#undef CONV_LABELS
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void *conv = conv_labels[convidx];
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unsigned int channel;
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for (channel = 0; channel < channels; ++channel) {
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const char *src;
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char *dst;
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int src_step, dst_step;
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snd_pcm_uframes_t frames1;
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const snd_pcm_channel_area_t *src_area = &src_areas[channel];
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const snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
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src = snd_pcm_channel_area_addr(src_area, src_offset);
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dst = snd_pcm_channel_area_addr(dst_area, dst_offset);
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src_step = snd_pcm_channel_area_step(src_area);
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dst_step = snd_pcm_channel_area_step(dst_area);
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frames1 = frames;
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while (frames1-- > 0) {
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goto *conv;
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#define CONV_END after
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#include "plugin_ops.h"
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#undef CONV_END
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after:
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src += src_step;
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dst += dst_step;
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}
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}
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}
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static int snd_pcm_lfloat_hw_refine_cprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
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{
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snd_pcm_lfloat_t *lfloat = pcm->private_data;
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int err;
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snd_pcm_access_mask_t access_mask = { SND_PCM_ACCBIT_SHM };
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snd_pcm_format_mask_t lformat_mask = { SND_PCM_FMTBIT_LINEAR };
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snd_pcm_format_mask_t fformat_mask = { SND_PCM_FMTBIT_FLOAT };
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err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_ACCESS,
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&access_mask);
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if (err < 0)
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return err;
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err = _snd_pcm_hw_param_set_mask(params, SND_PCM_HW_PARAM_FORMAT,
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snd_pcm_format_linear(lfloat->sformat) ?
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&fformat_mask : &lformat_mask);
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if (err < 0)
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return err;
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err = _snd_pcm_hw_params_set_subformat(params, SND_PCM_SUBFORMAT_STD);
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if (err < 0)
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return err;
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params->info &= ~(SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID);
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return 0;
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}
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static int snd_pcm_lfloat_hw_refine_sprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *sparams)
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{
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snd_pcm_lfloat_t *lfloat = pcm->private_data;
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snd_pcm_access_mask_t saccess_mask = { SND_PCM_ACCBIT_MMAP };
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_snd_pcm_hw_params_any(sparams);
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_snd_pcm_hw_param_set_mask(sparams, SND_PCM_HW_PARAM_ACCESS,
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&saccess_mask);
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_snd_pcm_hw_params_set_format(sparams, lfloat->sformat);
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_snd_pcm_hw_params_set_subformat(sparams, SND_PCM_SUBFORMAT_STD);
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return 0;
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}
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static int snd_pcm_lfloat_hw_refine_schange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params,
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snd_pcm_hw_params_t *sparams)
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{
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int err;
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unsigned int links = (SND_PCM_HW_PARBIT_CHANNELS |
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SND_PCM_HW_PARBIT_RATE |
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SND_PCM_HW_PARBIT_PERIOD_SIZE |
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SND_PCM_HW_PARBIT_BUFFER_SIZE |
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SND_PCM_HW_PARBIT_PERIODS |
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SND_PCM_HW_PARBIT_PERIOD_TIME |
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SND_PCM_HW_PARBIT_BUFFER_TIME |
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SND_PCM_HW_PARBIT_TICK_TIME);
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err = _snd_pcm_hw_params_refine(sparams, links, params);
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if (err < 0)
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return err;
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return 0;
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}
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static int snd_pcm_lfloat_hw_refine_cchange(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params,
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snd_pcm_hw_params_t *sparams)
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{
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int err;
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unsigned int links = (SND_PCM_HW_PARBIT_CHANNELS |
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SND_PCM_HW_PARBIT_RATE |
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SND_PCM_HW_PARBIT_PERIOD_SIZE |
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SND_PCM_HW_PARBIT_BUFFER_SIZE |
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SND_PCM_HW_PARBIT_PERIODS |
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SND_PCM_HW_PARBIT_PERIOD_TIME |
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SND_PCM_HW_PARBIT_BUFFER_TIME |
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SND_PCM_HW_PARBIT_TICK_TIME);
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err = _snd_pcm_hw_params_refine(params, links, sparams);
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if (err < 0)
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return err;
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return 0;
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}
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static int snd_pcm_lfloat_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
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{
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return snd_pcm_hw_refine_slave(pcm, params,
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snd_pcm_lfloat_hw_refine_cprepare,
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snd_pcm_lfloat_hw_refine_cchange,
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snd_pcm_lfloat_hw_refine_sprepare,
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snd_pcm_lfloat_hw_refine_schange,
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snd_pcm_plugin_hw_refine_slave);
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}
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static int snd_pcm_lfloat_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
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{
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snd_pcm_lfloat_t *lfloat = pcm->private_data;
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int err = snd_pcm_hw_params_slave(pcm, params,
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snd_pcm_lfloat_hw_refine_cchange,
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snd_pcm_lfloat_hw_refine_sprepare,
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snd_pcm_lfloat_hw_refine_schange,
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snd_pcm_plugin_hw_params_slave);
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if (err < 0)
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return err;
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if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
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lfloat->conv_idx = snd_pcm_lfloat_convert_index(snd_pcm_hw_params_get_format(params),
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lfloat->sformat);
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else
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lfloat->conv_idx = snd_pcm_lfloat_convert_index(lfloat->sformat,
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snd_pcm_hw_params_get_format(params));
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return 0;
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}
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static snd_pcm_uframes_t
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snd_pcm_lfloat_write_areas(snd_pcm_t *pcm,
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const snd_pcm_channel_area_t *areas,
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snd_pcm_uframes_t offset,
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snd_pcm_uframes_t size,
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const snd_pcm_channel_area_t *slave_areas,
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snd_pcm_uframes_t slave_offset,
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snd_pcm_uframes_t *slave_sizep)
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{
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snd_pcm_lfloat_t *lfloat = pcm->private_data;
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if (size > *slave_sizep)
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size = *slave_sizep;
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snd_pcm_lfloat_convert(slave_areas, slave_offset,
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areas, offset,
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pcm->channels, size, lfloat->conv_idx);
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*slave_sizep = size;
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return size;
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}
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static snd_pcm_uframes_t
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snd_pcm_lfloat_read_areas(snd_pcm_t *pcm,
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const snd_pcm_channel_area_t *areas,
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snd_pcm_uframes_t offset,
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snd_pcm_uframes_t size,
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const snd_pcm_channel_area_t *slave_areas,
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snd_pcm_uframes_t slave_offset,
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snd_pcm_uframes_t *slave_sizep)
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{
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snd_pcm_lfloat_t *lfloat = pcm->private_data;
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if (size > *slave_sizep)
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size = *slave_sizep;
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snd_pcm_lfloat_convert(areas, offset,
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slave_areas, slave_offset,
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pcm->channels, size, lfloat->conv_idx);
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*slave_sizep = size;
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return size;
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}
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static void snd_pcm_lfloat_dump(snd_pcm_t *pcm, snd_output_t *out)
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{
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snd_pcm_lfloat_t *lfloat = pcm->private_data;
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snd_output_printf(out, "Linear Integer <-> Linear Float conversion PCM (%s)\n",
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snd_pcm_format_name(lfloat->sformat));
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if (pcm->setup) {
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snd_output_printf(out, "Its setup is:\n");
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snd_pcm_dump_setup(pcm, out);
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}
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snd_output_printf(out, "Slave: ");
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snd_pcm_dump(lfloat->plug.slave, out);
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}
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snd_pcm_ops_t snd_pcm_lfloat_ops = {
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close: snd_pcm_plugin_close,
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info: snd_pcm_plugin_info,
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hw_refine: snd_pcm_lfloat_hw_refine,
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hw_params: snd_pcm_lfloat_hw_params,
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hw_free: snd_pcm_plugin_hw_free,
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sw_params: snd_pcm_plugin_sw_params,
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channel_info: snd_pcm_plugin_channel_info,
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dump: snd_pcm_lfloat_dump,
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nonblock: snd_pcm_plugin_nonblock,
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async: snd_pcm_plugin_async,
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mmap: snd_pcm_plugin_mmap,
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munmap: snd_pcm_plugin_munmap,
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};
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int snd_pcm_lfloat_open(snd_pcm_t **pcmp, const char *name, snd_pcm_format_t sformat, snd_pcm_t *slave, int close_slave)
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{
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snd_pcm_t *pcm;
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snd_pcm_lfloat_t *lfloat;
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int err;
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assert(pcmp && slave);
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if (snd_pcm_format_linear(sformat) != 1 &&
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snd_pcm_format_float(sformat) != 1)
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return -EINVAL;
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lfloat = calloc(1, sizeof(snd_pcm_lfloat_t));
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if (!lfloat) {
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return -ENOMEM;
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}
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lfloat->sformat = sformat;
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lfloat->plug.read = snd_pcm_lfloat_read_areas;
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lfloat->plug.write = snd_pcm_lfloat_write_areas;
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lfloat->plug.slave = slave;
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lfloat->plug.close_slave = close_slave;
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err = snd_pcm_new(&pcm, SND_PCM_TYPE_LINEAR_FLOAT, name, slave->stream, slave->mode);
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if (err < 0) {
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free(lfloat);
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return err;
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}
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pcm->ops = &snd_pcm_lfloat_ops;
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pcm->fast_ops = &snd_pcm_plugin_fast_ops;
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pcm->private_data = lfloat;
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pcm->poll_fd = slave->poll_fd;
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pcm->hw_ptr = &lfloat->plug.hw_ptr;
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pcm->appl_ptr = &lfloat->plug.appl_ptr;
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*pcmp = pcm;
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return 0;
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}
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int _snd_pcm_lfloat_open(snd_pcm_t **pcmp, const char *name,
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snd_config_t *root, snd_config_t *conf,
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snd_pcm_stream_t stream, int mode)
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{
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snd_config_iterator_t i, next;
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int err;
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snd_pcm_t *spcm;
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snd_config_t *slave = NULL, *sconf;
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snd_pcm_format_t sformat;
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snd_config_for_each(i, next, conf) {
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snd_config_t *n = snd_config_iterator_entry(i);
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const char *id;
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if (snd_config_get_id(n, &id) < 0)
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continue;
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if (snd_pcm_conf_generic_id(id))
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continue;
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if (strcmp(id, "slave") == 0) {
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slave = n;
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continue;
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}
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SNDERR("Unknown field %s", id);
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return -EINVAL;
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}
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if (!slave) {
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SNDERR("slave is not defined");
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return -EINVAL;
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}
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err = snd_pcm_slave_conf(root, slave, &sconf, 1,
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SND_PCM_HW_PARAM_FORMAT, SCONF_MANDATORY, &sformat);
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if (err < 0)
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return err;
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if (snd_pcm_format_linear(sformat) != 1 &&
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snd_pcm_format_float(sformat) != 1) {
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snd_config_delete(sconf);
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SNDERR("slave format is not linear integer or linear float");
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return -EINVAL;
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}
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err = snd_pcm_open_slave(&spcm, root, sconf, stream, mode);
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snd_config_delete(sconf);
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if (err < 0)
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return err;
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err = snd_pcm_lfloat_open(pcmp, name, sformat, spcm, 1);
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if (err < 0)
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snd_pcm_close(spcm);
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return err;
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}
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SND_DLSYM_BUILD_VERSION(_snd_pcm_lfloat_open, SND_PCM_DLSYM_VERSION);
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