mirror of
https://github.com/alsa-project/alsa-lib.git
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8ed98db259
By doing this we move them from the .data section to .rodata setion, or from .data.rel to .data.rel.ro. The .rodata section is mapped directly from the on-disk file, which is always a save, while .data.rel.ro is mapped directly when using prelink, which is a save in a lot of cases. Signed-off-by: Diego E. 'Flameeyes' Pettenò <flameeyes@gmail.com>
833 lines
21 KiB
C
833 lines
21 KiB
C
/*
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* PCM Interface - misc routines
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* Copyright (c) 1998 by Jaroslav Kysela <perex@perex.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 Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <byteswap.h>
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#include "pcm_local.h"
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/**
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* \brief Return sign info for a PCM sample linear format
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* \param format Format
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* \return 0 unsigned, 1 signed, a negative error code if format is not linear
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*/
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int snd_pcm_format_signed(snd_pcm_format_t format)
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{
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switch (format) {
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case SNDRV_PCM_FORMAT_S8:
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case SNDRV_PCM_FORMAT_S16_LE:
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case SNDRV_PCM_FORMAT_S16_BE:
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S24_BE:
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case SNDRV_PCM_FORMAT_S32_LE:
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case SNDRV_PCM_FORMAT_S32_BE:
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case SNDRV_PCM_FORMAT_S24_3LE:
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case SNDRV_PCM_FORMAT_S24_3BE:
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case SNDRV_PCM_FORMAT_S20_3LE:
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case SNDRV_PCM_FORMAT_S20_3BE:
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case SNDRV_PCM_FORMAT_S18_3LE:
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case SNDRV_PCM_FORMAT_S18_3BE:
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return 1;
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case SNDRV_PCM_FORMAT_U8:
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case SNDRV_PCM_FORMAT_U16_LE:
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case SNDRV_PCM_FORMAT_U16_BE:
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case SNDRV_PCM_FORMAT_U24_LE:
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case SNDRV_PCM_FORMAT_U24_BE:
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case SNDRV_PCM_FORMAT_U32_LE:
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case SNDRV_PCM_FORMAT_U32_BE:
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case SNDRV_PCM_FORMAT_U24_3LE:
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case SNDRV_PCM_FORMAT_U24_3BE:
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case SNDRV_PCM_FORMAT_U20_3LE:
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case SNDRV_PCM_FORMAT_U20_3BE:
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case SNDRV_PCM_FORMAT_U18_3LE:
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case SNDRV_PCM_FORMAT_U18_3BE:
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return 0;
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default:
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return -EINVAL;
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}
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}
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/**
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* \brief Return sign info for a PCM sample linear format
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* \param format Format
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* \return 0 signed, 1 unsigned, a negative error code if format is not linear
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*/
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int snd_pcm_format_unsigned(snd_pcm_format_t format)
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{
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int val;
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val = snd_pcm_format_signed(format);
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if (val < 0)
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return val;
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return !val;
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}
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/**
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* \brief Return linear info for a PCM sample format
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* \param format Format
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* \return 0 non linear, 1 linear
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*/
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int snd_pcm_format_linear(snd_pcm_format_t format)
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{
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return snd_pcm_format_signed(format) >= 0;
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}
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/**
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* \brief Return float info for a PCM sample format
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* \param format Format
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* \return 0 non float, 1 float
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*/
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int snd_pcm_format_float(snd_pcm_format_t format)
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{
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switch (format) {
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case SNDRV_PCM_FORMAT_FLOAT_LE:
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case SNDRV_PCM_FORMAT_FLOAT_BE:
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case SNDRV_PCM_FORMAT_FLOAT64_LE:
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case SNDRV_PCM_FORMAT_FLOAT64_BE:
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return 1;
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default:
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return 0;
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}
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}
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/**
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* \brief Return endian info for a PCM sample format
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* \param format Format
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* \return 0 big endian, 1 little endian, a negative error code if endian independent
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*/
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int snd_pcm_format_little_endian(snd_pcm_format_t format)
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{
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switch (format) {
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case SNDRV_PCM_FORMAT_S16_LE:
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case SNDRV_PCM_FORMAT_U16_LE:
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_U24_LE:
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case SNDRV_PCM_FORMAT_S32_LE:
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case SNDRV_PCM_FORMAT_U32_LE:
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case SNDRV_PCM_FORMAT_FLOAT_LE:
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case SNDRV_PCM_FORMAT_FLOAT64_LE:
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case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
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case SNDRV_PCM_FORMAT_S24_3LE:
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case SNDRV_PCM_FORMAT_S20_3LE:
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case SNDRV_PCM_FORMAT_S18_3LE:
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case SNDRV_PCM_FORMAT_U24_3LE:
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case SNDRV_PCM_FORMAT_U20_3LE:
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case SNDRV_PCM_FORMAT_U18_3LE:
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return 1;
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case SNDRV_PCM_FORMAT_S16_BE:
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case SNDRV_PCM_FORMAT_U16_BE:
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case SNDRV_PCM_FORMAT_S24_BE:
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case SNDRV_PCM_FORMAT_U24_BE:
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case SNDRV_PCM_FORMAT_S32_BE:
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case SNDRV_PCM_FORMAT_U32_BE:
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case SNDRV_PCM_FORMAT_FLOAT_BE:
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case SNDRV_PCM_FORMAT_FLOAT64_BE:
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case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE:
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case SNDRV_PCM_FORMAT_S24_3BE:
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case SNDRV_PCM_FORMAT_S20_3BE:
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case SNDRV_PCM_FORMAT_S18_3BE:
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case SNDRV_PCM_FORMAT_U24_3BE:
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case SNDRV_PCM_FORMAT_U20_3BE:
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case SNDRV_PCM_FORMAT_U18_3BE:
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return 0;
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default:
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return -EINVAL;
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}
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}
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/**
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* \brief Return endian info for a PCM sample format
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* \param format Format
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* \return 0 little endian, 1 big endian, a negative error code if endian independent
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*/
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int snd_pcm_format_big_endian(snd_pcm_format_t format)
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{
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int val;
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val = snd_pcm_format_little_endian(format);
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if (val < 0)
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return val;
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return !val;
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}
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/**
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* \brief Return endian info for a PCM sample format
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* \param format Format
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* \return 0 swapped, 1 CPU endian, a negative error code if endian independent
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*/
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int snd_pcm_format_cpu_endian(snd_pcm_format_t format)
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{
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#ifdef SNDRV_LITTLE_ENDIAN
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return snd_pcm_format_little_endian(format);
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#else
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return snd_pcm_format_big_endian(format);
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#endif
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}
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/**
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* \brief Return nominal bits per a PCM sample
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* \param format Sample format
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* \return bits per sample, a negative error code if not applicable
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*/
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int snd_pcm_format_width(snd_pcm_format_t format)
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{
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switch (format) {
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case SNDRV_PCM_FORMAT_S8:
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case SNDRV_PCM_FORMAT_U8:
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return 8;
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case SNDRV_PCM_FORMAT_S16_LE:
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case SNDRV_PCM_FORMAT_S16_BE:
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case SNDRV_PCM_FORMAT_U16_LE:
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case SNDRV_PCM_FORMAT_U16_BE:
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return 16;
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case SNDRV_PCM_FORMAT_S18_3LE:
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case SNDRV_PCM_FORMAT_S18_3BE:
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case SNDRV_PCM_FORMAT_U18_3LE:
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case SNDRV_PCM_FORMAT_U18_3BE:
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return 18;
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case SNDRV_PCM_FORMAT_S20_3LE:
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case SNDRV_PCM_FORMAT_S20_3BE:
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case SNDRV_PCM_FORMAT_U20_3LE:
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case SNDRV_PCM_FORMAT_U20_3BE:
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return 20;
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S24_BE:
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case SNDRV_PCM_FORMAT_U24_LE:
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case SNDRV_PCM_FORMAT_U24_BE:
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case SNDRV_PCM_FORMAT_S24_3LE:
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case SNDRV_PCM_FORMAT_S24_3BE:
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case SNDRV_PCM_FORMAT_U24_3LE:
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case SNDRV_PCM_FORMAT_U24_3BE:
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return 24;
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case SNDRV_PCM_FORMAT_S32_LE:
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case SNDRV_PCM_FORMAT_S32_BE:
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case SNDRV_PCM_FORMAT_U32_LE:
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case SNDRV_PCM_FORMAT_U32_BE:
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case SNDRV_PCM_FORMAT_FLOAT_LE:
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case SNDRV_PCM_FORMAT_FLOAT_BE:
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return 32;
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case SNDRV_PCM_FORMAT_FLOAT64_LE:
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case SNDRV_PCM_FORMAT_FLOAT64_BE:
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return 64;
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case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
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case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE:
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return 32;
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case SNDRV_PCM_FORMAT_MU_LAW:
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case SNDRV_PCM_FORMAT_A_LAW:
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return 8;
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case SNDRV_PCM_FORMAT_IMA_ADPCM:
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return 4;
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default:
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return -EINVAL;
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}
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}
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/**
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* \brief Return bits needed to store a PCM sample
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* \param format Sample format
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* \return bits per sample, a negative error code if not applicable
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*/
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int snd_pcm_format_physical_width(snd_pcm_format_t format)
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{
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switch (format) {
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case SNDRV_PCM_FORMAT_S8:
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case SNDRV_PCM_FORMAT_U8:
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return 8;
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case SNDRV_PCM_FORMAT_S16_LE:
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case SNDRV_PCM_FORMAT_S16_BE:
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case SNDRV_PCM_FORMAT_U16_LE:
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case SNDRV_PCM_FORMAT_U16_BE:
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return 16;
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case SNDRV_PCM_FORMAT_S18_3LE:
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case SNDRV_PCM_FORMAT_S18_3BE:
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case SNDRV_PCM_FORMAT_U18_3LE:
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case SNDRV_PCM_FORMAT_U18_3BE:
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case SNDRV_PCM_FORMAT_S20_3LE:
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case SNDRV_PCM_FORMAT_S20_3BE:
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case SNDRV_PCM_FORMAT_U20_3LE:
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case SNDRV_PCM_FORMAT_U20_3BE:
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case SNDRV_PCM_FORMAT_S24_3LE:
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case SNDRV_PCM_FORMAT_S24_3BE:
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case SNDRV_PCM_FORMAT_U24_3LE:
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case SNDRV_PCM_FORMAT_U24_3BE:
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return 24;
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S24_BE:
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case SNDRV_PCM_FORMAT_U24_LE:
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case SNDRV_PCM_FORMAT_U24_BE:
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case SNDRV_PCM_FORMAT_S32_LE:
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case SNDRV_PCM_FORMAT_S32_BE:
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case SNDRV_PCM_FORMAT_U32_LE:
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case SNDRV_PCM_FORMAT_U32_BE:
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case SNDRV_PCM_FORMAT_FLOAT_LE:
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case SNDRV_PCM_FORMAT_FLOAT_BE:
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case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
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case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE:
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return 32;
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case SNDRV_PCM_FORMAT_FLOAT64_LE:
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case SNDRV_PCM_FORMAT_FLOAT64_BE:
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return 64;
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case SNDRV_PCM_FORMAT_MU_LAW:
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case SNDRV_PCM_FORMAT_A_LAW:
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return 8;
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case SNDRV_PCM_FORMAT_IMA_ADPCM:
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return 4;
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default:
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return -EINVAL;
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}
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}
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/**
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* \brief Return bytes needed to store a quantity of PCM sample
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* \param format Sample format
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* \param samples Samples count
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* \return bytes needed, a negative error code if not integer or unknown
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*/
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ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples)
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{
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switch (format) {
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case SNDRV_PCM_FORMAT_S8:
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case SNDRV_PCM_FORMAT_U8:
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return samples;
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case SNDRV_PCM_FORMAT_S16_LE:
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case SNDRV_PCM_FORMAT_S16_BE:
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case SNDRV_PCM_FORMAT_U16_LE:
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case SNDRV_PCM_FORMAT_U16_BE:
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return samples * 2;
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case SNDRV_PCM_FORMAT_S18_3LE:
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case SNDRV_PCM_FORMAT_S18_3BE:
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case SNDRV_PCM_FORMAT_U18_3LE:
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case SNDRV_PCM_FORMAT_U18_3BE:
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case SNDRV_PCM_FORMAT_S20_3LE:
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case SNDRV_PCM_FORMAT_S20_3BE:
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case SNDRV_PCM_FORMAT_U20_3LE:
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case SNDRV_PCM_FORMAT_U20_3BE:
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case SNDRV_PCM_FORMAT_S24_3LE:
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case SNDRV_PCM_FORMAT_S24_3BE:
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case SNDRV_PCM_FORMAT_U24_3LE:
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case SNDRV_PCM_FORMAT_U24_3BE:
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return samples * 3;
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S24_BE:
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case SNDRV_PCM_FORMAT_U24_LE:
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case SNDRV_PCM_FORMAT_U24_BE:
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case SNDRV_PCM_FORMAT_S32_LE:
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case SNDRV_PCM_FORMAT_S32_BE:
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case SNDRV_PCM_FORMAT_U32_LE:
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case SNDRV_PCM_FORMAT_U32_BE:
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case SNDRV_PCM_FORMAT_FLOAT_LE:
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case SNDRV_PCM_FORMAT_FLOAT_BE:
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return samples * 4;
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case SNDRV_PCM_FORMAT_FLOAT64_LE:
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case SNDRV_PCM_FORMAT_FLOAT64_BE:
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return samples * 8;
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case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
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case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE:
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return samples * 4;
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case SNDRV_PCM_FORMAT_MU_LAW:
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case SNDRV_PCM_FORMAT_A_LAW:
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return samples;
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case SNDRV_PCM_FORMAT_IMA_ADPCM:
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if (samples & 1)
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return -EINVAL;
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return samples / 2;
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default:
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assert(0);
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return -EINVAL;
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}
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}
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/**
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* \brief Return 64 bit expressing silence for a PCM sample format
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* \param format Sample format
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* \return silence 64 bit word
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*/
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u_int64_t snd_pcm_format_silence_64(snd_pcm_format_t format)
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{
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switch (format) {
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case SNDRV_PCM_FORMAT_S8:
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case SNDRV_PCM_FORMAT_S16_LE:
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case SNDRV_PCM_FORMAT_S16_BE:
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case SNDRV_PCM_FORMAT_S24_LE:
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case SNDRV_PCM_FORMAT_S24_BE:
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case SNDRV_PCM_FORMAT_S32_LE:
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case SNDRV_PCM_FORMAT_S32_BE:
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case SNDRV_PCM_FORMAT_S24_3LE:
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case SNDRV_PCM_FORMAT_S24_3BE:
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case SNDRV_PCM_FORMAT_S20_3LE:
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case SNDRV_PCM_FORMAT_S20_3BE:
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case SNDRV_PCM_FORMAT_S18_3LE:
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case SNDRV_PCM_FORMAT_S18_3BE:
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return 0;
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case SNDRV_PCM_FORMAT_U8:
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return 0x8080808080808080ULL;
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#ifdef SNDRV_LITTLE_ENDIAN
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case SNDRV_PCM_FORMAT_U16_LE:
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return 0x8000800080008000ULL;
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case SNDRV_PCM_FORMAT_U24_LE:
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return 0x0080000000800000ULL;
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case SNDRV_PCM_FORMAT_U32_LE:
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return 0x8000000080000000ULL;
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case SNDRV_PCM_FORMAT_U16_BE:
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return 0x0080008000800080ULL;
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case SNDRV_PCM_FORMAT_U24_BE:
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return 0x0000800000008000ULL;
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case SNDRV_PCM_FORMAT_U32_BE:
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return 0x0000008000000080ULL;
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case SNDRV_PCM_FORMAT_U24_3LE:
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return 0x0000800000800000ULL;
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case SNDRV_PCM_FORMAT_U24_3BE:
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return 0x0080000080000080ULL;
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case SNDRV_PCM_FORMAT_U20_3LE:
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return 0x0000080000080000ULL;
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case SNDRV_PCM_FORMAT_U20_3BE:
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return 0x0008000008000008ULL;
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case SNDRV_PCM_FORMAT_U18_3LE:
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return 0x0000020000020000ULL;
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case SNDRV_PCM_FORMAT_U18_3BE:
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return 0x0002000002000002ULL;
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#else
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case SNDRV_PCM_FORMAT_U16_LE:
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return 0x0080008000800080ULL;
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case SNDRV_PCM_FORMAT_U24_LE:
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return 0x0000800000008000ULL;
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case SNDRV_PCM_FORMAT_U32_LE:
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return 0x0000008000000080ULL;
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case SNDRV_PCM_FORMAT_U16_BE:
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return 0x8000800080008000ULL;
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case SNDRV_PCM_FORMAT_U24_BE:
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return 0x0080000000800000ULL;
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case SNDRV_PCM_FORMAT_U32_BE:
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return 0x8000000080000000ULL;
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case SNDRV_PCM_FORMAT_U24_3LE:
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return 0x0080000080000080ULL;
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case SNDRV_PCM_FORMAT_U24_3BE:
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return 0x0000800000800000ULL;
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case SNDRV_PCM_FORMAT_U20_3LE:
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return 0x0008000008000008ULL;
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case SNDRV_PCM_FORMAT_U20_3BE:
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return 0x0000080000080000ULL;
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case SNDRV_PCM_FORMAT_U18_3LE:
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return 0x0002000002000002ULL;
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case SNDRV_PCM_FORMAT_U18_3BE:
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return 0x0000020000020000ULL;
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#endif
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case SNDRV_PCM_FORMAT_FLOAT_LE:
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{
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union {
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float f[2];
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u_int64_t i;
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} u;
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u.f[0] = u.f[1] = 0.0;
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#ifdef SNDRV_LITTLE_ENDIAN
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return u.i;
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#else
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return bswap_64(u.i);
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#endif
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}
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case SNDRV_PCM_FORMAT_FLOAT64_LE:
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{
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union {
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double f;
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u_int64_t i;
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} u;
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u.f = 0.0;
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#ifdef SNDRV_LITTLE_ENDIAN
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return u.i;
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#else
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return bswap_64(u.i);
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#endif
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}
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case SNDRV_PCM_FORMAT_FLOAT_BE:
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{
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union {
|
|
float f[2];
|
|
u_int64_t i;
|
|
} u;
|
|
u.f[0] = u.f[1] = 0.0;
|
|
#ifdef SNDRV_LITTLE_ENDIAN
|
|
return bswap_64(u.i);
|
|
#else
|
|
return u.i;
|
|
#endif
|
|
}
|
|
case SNDRV_PCM_FORMAT_FLOAT64_BE:
|
|
{
|
|
union {
|
|
double f;
|
|
u_int64_t i;
|
|
} u;
|
|
u.f = 0.0;
|
|
#ifdef SNDRV_LITTLE_ENDIAN
|
|
return bswap_64(u.i);
|
|
#else
|
|
return u.i;
|
|
#endif
|
|
}
|
|
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE:
|
|
case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE:
|
|
return 0;
|
|
case SNDRV_PCM_FORMAT_MU_LAW:
|
|
return 0x7f7f7f7f7f7f7f7fULL;
|
|
case SNDRV_PCM_FORMAT_A_LAW:
|
|
return 0x5555555555555555ULL;
|
|
case SNDRV_PCM_FORMAT_IMA_ADPCM: /* special case */
|
|
case SNDRV_PCM_FORMAT_MPEG:
|
|
case SNDRV_PCM_FORMAT_GSM:
|
|
case SNDRV_PCM_FORMAT_SPECIAL:
|
|
return 0;
|
|
default:
|
|
assert(0);
|
|
return 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* \brief Return 32 bit expressing silence for a PCM sample format
|
|
* \param format Sample format
|
|
* \return silence 32 bit word
|
|
*/
|
|
u_int32_t snd_pcm_format_silence_32(snd_pcm_format_t format)
|
|
{
|
|
assert(snd_pcm_format_physical_width(format) <= 32);
|
|
return (u_int32_t)snd_pcm_format_silence_64(format);
|
|
}
|
|
|
|
/**
|
|
* \brief Return 16 bit expressing silence for a PCM sample format
|
|
* \param format Sample format
|
|
* \return silence 16 bit word
|
|
*/
|
|
u_int16_t snd_pcm_format_silence_16(snd_pcm_format_t format)
|
|
{
|
|
assert(snd_pcm_format_physical_width(format) <= 16);
|
|
return (u_int16_t)snd_pcm_format_silence_64(format);
|
|
}
|
|
|
|
/**
|
|
* \brief Return 8 bit expressing silence for a PCM sample format
|
|
* \param format Sample format
|
|
* \return silence 8 bit word
|
|
*/
|
|
u_int8_t snd_pcm_format_silence(snd_pcm_format_t format)
|
|
{
|
|
assert(snd_pcm_format_physical_width(format) <= 8);
|
|
return (u_int8_t)snd_pcm_format_silence_64(format);
|
|
}
|
|
|
|
/**
|
|
* \brief Silence a PCM samples buffer
|
|
* \param format Sample format
|
|
* \param data Buffer
|
|
* \param samples Samples count
|
|
* \return 0 if successful or a negative error code
|
|
*/
|
|
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples)
|
|
{
|
|
if (samples == 0)
|
|
return 0;
|
|
switch (snd_pcm_format_physical_width(format)) {
|
|
case 4: {
|
|
u_int8_t silence = snd_pcm_format_silence_64(format);
|
|
unsigned int samples1;
|
|
if (samples % 2 != 0)
|
|
return -EINVAL;
|
|
samples1 = samples / 2;
|
|
memset(data, silence, samples1);
|
|
break;
|
|
}
|
|
case 8: {
|
|
u_int8_t silence = snd_pcm_format_silence_64(format);
|
|
memset(data, silence, samples);
|
|
break;
|
|
}
|
|
case 16: {
|
|
u_int16_t silence = snd_pcm_format_silence_64(format);
|
|
u_int16_t *pdata = (u_int16_t *)data;
|
|
if (! silence)
|
|
memset(data, 0, samples * 2);
|
|
else {
|
|
while (samples-- > 0)
|
|
*pdata++ = silence;
|
|
}
|
|
break;
|
|
}
|
|
case 24: {
|
|
u_int32_t silence = snd_pcm_format_silence_64(format);
|
|
u_int8_t *pdata = (u_int8_t *)data;
|
|
if (! silence)
|
|
memset(data, 0, samples * 3);
|
|
else {
|
|
while (samples-- > 0) {
|
|
#ifdef SNDRV_LITTLE_ENDIAN
|
|
*pdata++ = silence >> 0;
|
|
*pdata++ = silence >> 8;
|
|
*pdata++ = silence >> 16;
|
|
#else
|
|
*pdata++ = silence >> 16;
|
|
*pdata++ = silence >> 8;
|
|
*pdata++ = silence >> 0;
|
|
#endif
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case 32: {
|
|
u_int32_t silence = snd_pcm_format_silence_64(format);
|
|
u_int32_t *pdata = (u_int32_t *)data;
|
|
if (! silence)
|
|
memset(data, 0, samples * 4);
|
|
else {
|
|
while (samples-- > 0)
|
|
*pdata++ = silence;
|
|
}
|
|
break;
|
|
}
|
|
case 64: {
|
|
u_int64_t silence = snd_pcm_format_silence_64(format);
|
|
u_int64_t *pdata = (u_int64_t *)data;
|
|
if (! silence)
|
|
memset(data, 0, samples * 8);
|
|
else {
|
|
while (samples-- > 0)
|
|
*pdata++ = silence;
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
assert(0);
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const int linear_formats[4][2][2] = {
|
|
{ { SNDRV_PCM_FORMAT_S8, SNDRV_PCM_FORMAT_S8 },
|
|
{ SNDRV_PCM_FORMAT_U8, SNDRV_PCM_FORMAT_U8 } },
|
|
{ { SNDRV_PCM_FORMAT_S16_LE, SNDRV_PCM_FORMAT_S16_BE },
|
|
{ SNDRV_PCM_FORMAT_U16_LE, SNDRV_PCM_FORMAT_U16_BE } },
|
|
{ { SNDRV_PCM_FORMAT_S24_LE, SNDRV_PCM_FORMAT_S24_BE },
|
|
{ SNDRV_PCM_FORMAT_U24_LE, SNDRV_PCM_FORMAT_U24_BE } },
|
|
{ { SNDRV_PCM_FORMAT_S32_LE, SNDRV_PCM_FORMAT_S32_BE },
|
|
{ SNDRV_PCM_FORMAT_U32_LE, SNDRV_PCM_FORMAT_U32_BE } }
|
|
};
|
|
|
|
static const int linear24_formats[3][2][2] = {
|
|
{ { SNDRV_PCM_FORMAT_S24_3LE, SNDRV_PCM_FORMAT_S24_3BE },
|
|
{ SNDRV_PCM_FORMAT_U24_3LE, SNDRV_PCM_FORMAT_U24_3BE } },
|
|
{ { SNDRV_PCM_FORMAT_S20_3LE, SNDRV_PCM_FORMAT_S20_3BE },
|
|
{ SNDRV_PCM_FORMAT_U20_3LE, SNDRV_PCM_FORMAT_U20_3BE } },
|
|
{ { SNDRV_PCM_FORMAT_S18_3LE, SNDRV_PCM_FORMAT_S18_3BE },
|
|
{ SNDRV_PCM_FORMAT_U18_3LE, SNDRV_PCM_FORMAT_U18_3BE } },
|
|
};
|
|
|
|
/**
|
|
* \brief Compose a PCM sample linear format
|
|
* \param width Nominal bits per sample
|
|
* \param pwidth Physical bit width of the format
|
|
* \param unsignd Sign: 0 signed, 1 unsigned
|
|
* \param big_endian Endian: 0 little endian, 1 big endian
|
|
* \return The matching format type, or #SND_PCM_FORMAT_UNKNOWN if no match
|
|
*/
|
|
snd_pcm_format_t snd_pcm_build_linear_format(int width, int pwidth, int unsignd, int big_endian)
|
|
{
|
|
if (pwidth == 24) {
|
|
switch (width) {
|
|
case 24:
|
|
width = 0;
|
|
break;
|
|
case 20:
|
|
width = 1;
|
|
break;
|
|
case 18:
|
|
width = 2;
|
|
break;
|
|
default:
|
|
return SND_PCM_FORMAT_UNKNOWN;
|
|
}
|
|
return linear24_formats[width][!!unsignd][!!big_endian];
|
|
} else {
|
|
switch (width) {
|
|
case 8:
|
|
width = 0;
|
|
break;
|
|
case 16:
|
|
width = 1;
|
|
break;
|
|
case 24:
|
|
width = 2;
|
|
break;
|
|
case 32:
|
|
width = 3;
|
|
break;
|
|
default:
|
|
return SND_PCM_FORMAT_UNKNOWN;
|
|
}
|
|
return linear_formats[width][!!unsignd][!!big_endian];
|
|
}
|
|
}
|
|
|
|
/**
|
|
* \brief Parse control element id from the config
|
|
* \param conf the config tree to parse
|
|
* \param ctl_id the pointer to store the resultant control element id
|
|
* \param cardp the pointer to store the card index
|
|
* \param cchannelsp the pointer to store the number of channels (optional)
|
|
* \param hwctlp the pointer to store the h/w control flag (optional)
|
|
* \return 0 if successful, or a negative error code
|
|
*
|
|
* This function parses the given config tree to retrieve the control element id
|
|
* and the card index. It's used by softvol. External PCM plugins can use this
|
|
* function for creating or assigining their controls.
|
|
*
|
|
* cchannelsp and hwctlp arguments are optional. Set NULL if not necessary.
|
|
*/
|
|
int snd_pcm_parse_control_id(snd_config_t *conf, snd_ctl_elem_id_t *ctl_id, int *cardp,
|
|
int *cchannelsp, int *hwctlp)
|
|
{
|
|
snd_config_iterator_t i, next;
|
|
int iface = SND_CTL_ELEM_IFACE_MIXER;
|
|
const char *name = NULL;
|
|
long index = 0;
|
|
long device = -1;
|
|
long subdevice = -1;
|
|
int err;
|
|
|
|
assert(ctl_id && cardp);
|
|
|
|
*cardp = -1;
|
|
if (cchannelsp)
|
|
*cchannelsp = 2;
|
|
snd_config_for_each(i, next, conf) {
|
|
snd_config_t *n = snd_config_iterator_entry(i);
|
|
const char *id;
|
|
if (snd_config_get_id(n, &id) < 0)
|
|
continue;
|
|
if (strcmp(id, "comment") == 0)
|
|
continue;
|
|
if (strcmp(id, "card") == 0) {
|
|
const char *str;
|
|
long v;
|
|
if ((err = snd_config_get_integer(n, &v)) < 0) {
|
|
if ((err = snd_config_get_string(n, &str)) < 0) {
|
|
SNDERR("Invalid field %s", id);
|
|
goto _err;
|
|
}
|
|
*cardp = snd_card_get_index(str);
|
|
if (*cardp < 0) {
|
|
SNDERR("Cannot get index for %s", str);
|
|
err = *cardp;
|
|
goto _err;
|
|
}
|
|
} else
|
|
*cardp = v;
|
|
continue;
|
|
}
|
|
if (strcmp(id, "iface") == 0 || strcmp(id, "interface") == 0) {
|
|
const char *ptr;
|
|
if ((err = snd_config_get_string(n, &ptr)) < 0) {
|
|
SNDERR("field %s is not a string", id);
|
|
goto _err;
|
|
}
|
|
if ((err = snd_config_get_ctl_iface_ascii(ptr)) < 0) {
|
|
SNDERR("Invalid value for '%s'", id);
|
|
goto _err;
|
|
}
|
|
iface = err;
|
|
continue;
|
|
}
|
|
if (strcmp(id, "name") == 0) {
|
|
if ((err = snd_config_get_string(n, &name)) < 0) {
|
|
SNDERR("field %s is not a string", id);
|
|
goto _err;
|
|
}
|
|
continue;
|
|
}
|
|
if (strcmp(id, "index") == 0) {
|
|
if ((err = snd_config_get_integer(n, &index)) < 0) {
|
|
SNDERR("field %s is not an integer", id);
|
|
goto _err;
|
|
}
|
|
continue;
|
|
}
|
|
if (strcmp(id, "device") == 0) {
|
|
if ((err = snd_config_get_integer(n, &device)) < 0) {
|
|
SNDERR("field %s is not an integer", id);
|
|
goto _err;
|
|
}
|
|
continue;
|
|
}
|
|
if (strcmp(id, "subdevice") == 0) {
|
|
if ((err = snd_config_get_integer(n, &subdevice)) < 0) {
|
|
SNDERR("field %s is not an integer", id);
|
|
goto _err;
|
|
}
|
|
continue;
|
|
}
|
|
if (cchannelsp && strcmp(id, "count") == 0) {
|
|
long v;
|
|
if ((err = snd_config_get_integer(n, &v)) < 0) {
|
|
SNDERR("field %s is not an integer", id);
|
|
goto _err;
|
|
}
|
|
if (v < 1 || v > 2) {
|
|
SNDERR("Invalid count %ld", v);
|
|
goto _err;
|
|
}
|
|
*cchannelsp = v;
|
|
continue;
|
|
}
|
|
if (hwctlp && strcmp(id, "hwctl") == 0) {
|
|
if ((err = snd_config_get_bool(n)) < 0) {
|
|
SNDERR("The field %s must be a boolean type", id);
|
|
return err;
|
|
}
|
|
*hwctlp = err;
|
|
continue;
|
|
}
|
|
SNDERR("Unknown field %s", id);
|
|
return -EINVAL;
|
|
}
|
|
if (name == NULL) {
|
|
SNDERR("Missing control name");
|
|
err = -EINVAL;
|
|
goto _err;
|
|
}
|
|
if (device < 0)
|
|
device = 0;
|
|
if (subdevice < 0)
|
|
subdevice = 0;
|
|
|
|
snd_ctl_elem_id_set_interface(ctl_id, iface);
|
|
snd_ctl_elem_id_set_name(ctl_id, name);
|
|
snd_ctl_elem_id_set_index(ctl_id, index);
|
|
snd_ctl_elem_id_set_device(ctl_id, device);
|
|
snd_ctl_elem_id_set_subdevice(ctl_id, subdevice);
|
|
|
|
return 0;
|
|
|
|
_err:
|
|
return err;
|
|
}
|