mirror of
https://github.com/alsa-project/alsa-lib.git
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Merged pcmplug branch.
This commit is contained in:
Jaroslav Kysela
parent
40d1ee071d
commit
6962a9d6ce
61 changed files with 7172 additions and 6743 deletions
693
src/pcm/pcm_rate.c
Normal file
693
src/pcm/pcm_rate.c
Normal file
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@ -0,0 +1,693 @@
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/*
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* PCM - Rate conversion
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* Copyright (c) 2000 by Abramo Bagnara <abramo@alsa-project.org>
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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 <limits.h>
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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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#define DIV (1<<16)
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typedef struct {
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int16_t sample;
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int sum;
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unsigned int pos;
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} rate_state_t;
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typedef size_t (*rate_f)(snd_pcm_channel_area_t *src_areas,
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size_t src_offset, size_t src_frames,
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snd_pcm_channel_area_t *dst_areas,
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size_t dst_offset, size_t *dst_framesp,
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size_t channels,
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int getidx, int putidx,
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unsigned int arg,
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rate_state_t *states);
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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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int get_idx;
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int put_idx;
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unsigned int pitch;
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rate_f func;
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int req_sformat;
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int req_srate;
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int sformat;
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int cformat;
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int srate;
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int crate;
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int cxfer_mode, cmmap_shape;
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rate_state_t *states;
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} snd_pcm_rate_t;
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static size_t resample_expand(snd_pcm_channel_area_t *src_areas,
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size_t src_offset, size_t src_frames,
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snd_pcm_channel_area_t *dst_areas,
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size_t dst_offset, size_t *dst_framesp,
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size_t channels,
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int getidx, int putidx,
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unsigned int get_threshold,
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rate_state_t *states)
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{
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#define GET_S16_LABELS
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#define PUT_S16_LABELS
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#include "plugin_ops.h"
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#undef GET_S16_LABELS
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#undef PUT_S16_LABELS
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void *get = get_s16_labels[getidx];
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void *put = put_s16_labels[putidx];
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unsigned int channel;
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size_t src_frames1 = 0;
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size_t dst_frames1 = 0;
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size_t dst_frames = *dst_framesp;
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int16_t sample = 0;
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if (src_frames == 0 ||
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dst_frames == 0)
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return 0;
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for (channel = 0; channel < channels; ++channel) {
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snd_pcm_channel_area_t *src_area = &src_areas[channel];
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snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
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char *src, *dst;
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int src_step, dst_step;
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int16_t old_sample = states->sample;
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unsigned int pos = states->pos;
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#if 0
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if (!src_area->enabled) {
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if (dst_area->wanted)
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snd_pcm_area_silence(&dst_area->area, 0, dst_frames, plugin->dst_format.sfmt);
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dst_area->enabled = 0;
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continue;
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}
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dst_area->enabled = 1;
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#endif
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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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src_frames1 = 0;
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dst_frames1 = 0;
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while (dst_frames1 < dst_frames) {
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if (pos >= get_threshold) {
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int16_t new_sample;
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if (src_frames1 == src_frames)
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break;
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pos -= get_threshold;
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goto *get;
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#define GET_S16_END after_get
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#include "plugin_ops.h"
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#undef GET_S16_END
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after_get:
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src += src_step;
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src_frames1++;
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new_sample = sample;
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sample = (old_sample * (DIV - pos) + new_sample * pos) / DIV;
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old_sample = new_sample;
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} else
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sample = old_sample;
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goto *put;
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#define PUT_S16_END after_put
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#include "plugin_ops.h"
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#undef PUT_S16_END
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after_put:
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dst += dst_step;
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dst_frames1++;
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pos += DIV;
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}
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states->sample = old_sample;
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states->pos = pos;
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states++;
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}
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*dst_framesp = dst_frames1;
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return src_frames1;
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}
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static size_t resample_shrink(snd_pcm_channel_area_t *src_areas,
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size_t src_offset, size_t src_frames,
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snd_pcm_channel_area_t *dst_areas,
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size_t dst_offset, size_t *dst_framesp,
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size_t channels,
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int getidx, int putidx,
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unsigned int get_increment,
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rate_state_t *states)
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{
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#define GET_S16_LABELS
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#define PUT_S16_LABELS
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#include "plugin_ops.h"
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#undef GET_S16_LABELS
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#undef PUT_S16_LABELS
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void *get = get_s16_labels[getidx];
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void *put = put_s16_labels[putidx];
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unsigned int channel;
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size_t src_frames1 = 0;
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size_t dst_frames1 = 0;
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size_t dst_frames = *dst_framesp;
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int16_t sample = 0;
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if (src_frames == 0 ||
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dst_frames == 0)
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return 0;
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for (channel = 0; channel < channels; ++channel) {
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snd_pcm_channel_area_t *src_area = &src_areas[channel];
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snd_pcm_channel_area_t *dst_area = &dst_areas[channel];
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unsigned int pos;
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int sum;
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char *src, *dst;
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int src_step, dst_step;
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sum = states->sum;
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pos = states->pos;
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#if 0
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if (!src_area->enabled) {
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if (dst_area->wanted)
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snd_pcm_area_silence(&dst_area->area, 0, dst_frames, plugin->dst_format.sfmt);
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dst_area->enabled = 0;
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continue;
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}
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dst_area->enabled = 1;
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#endif
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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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src_frames1 = 0;
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dst_frames1 = 0;
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while (src_frames1 < src_frames) {
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goto *get;
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#define GET_S16_END after_get
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#include "plugin_ops.h"
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#undef GET_S16_END
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after_get:
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src += src_step;
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src_frames1++;
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pos += get_increment;
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if (pos >= DIV) {
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int s = sample;
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pos -= DIV;
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sum += s * (get_increment - pos);
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sum /= DIV;
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sample = sum;
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goto *put;
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#define PUT_S16_END after_put
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#include "plugin_ops.h"
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#undef PUT_S16_END
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after_put:
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dst += dst_step;
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sum = s * pos;
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dst_frames1++;
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if (dst_frames1 == dst_frames)
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break;
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} else
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sum += sample * get_increment;
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}
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states->sum = sum;
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states->pos = pos;
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states++;
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}
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*dst_framesp = dst_frames1;
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return src_frames1;
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}
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static int snd_pcm_rate_close(snd_pcm_t *pcm)
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{
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snd_pcm_rate_t *rate = pcm->private;
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int err = 0;
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if (rate->plug.close_slave)
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err = snd_pcm_close(rate->plug.slave);
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if (rate->states)
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free(rate->states);
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free(rate);
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return 0;
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}
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static int snd_pcm_rate_params_info(snd_pcm_t *pcm, snd_pcm_params_info_t * info)
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{
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snd_pcm_rate_t *rate = pcm->private;
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unsigned int req_mask = info->req_mask;
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unsigned int sfmt = info->req.format.sfmt;
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unsigned int crate = info->req.format.rate;
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unsigned int srate;
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int err;
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if (req_mask & SND_PCM_PARAMS_SFMT &&
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!snd_pcm_format_linear(sfmt)) {
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info->req.fail_mask = SND_PCM_PARAMS_SFMT;
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info->req.fail_reason = SND_PCM_PARAMS_FAIL_INVAL;
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return -EINVAL;
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}
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if (rate->req_sformat >= 0) {
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info->req_mask |= SND_PCM_PARAMS_SFMT;
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info->req.format.sfmt = rate->req_sformat;
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}
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info->req_mask |= SND_PCM_PARAMS_RATE;
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info->req_mask &= ~(SND_PCM_PARAMS_MMAP_SHAPE |
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SND_PCM_PARAMS_XFER_MODE);
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info->req.format.rate = rate->req_srate;
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err = snd_pcm_params_info(rate->plug.slave, info);
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info->req_mask = req_mask;
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info->req.format.sfmt = sfmt;
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info->req.format.rate = crate;
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if (err < 0)
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return err;
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if (req_mask & SND_PCM_PARAMS_SFMT)
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info->formats = 1 << sfmt;
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else
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info->formats = SND_PCM_LINEAR_FORMATS;
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if (!(req_mask & SND_PCM_PARAMS_RATE)) {
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info->min_rate = 4000;
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info->max_rate = 192000;
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return 0;
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}
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if (rate->req_srate - info->min_rate < info->max_rate - rate->req_srate)
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srate = info->min_rate;
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else
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srate = info->max_rate;
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info->min_rate = crate;
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info->max_rate = crate;
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if (info->buffer_size)
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info->buffer_size = muldiv64(info->buffer_size, crate, srate);
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if (info->min_fragment_size)
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info->min_fragment_size = muldiv64(info->min_fragment_size, crate, srate);
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if (info->max_fragment_size)
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info->max_fragment_size = muldiv64(info->max_fragment_size, crate, srate);
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if (info->fragment_align)
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info->fragment_align = muldiv64(info->fragment_align, crate, srate);
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info->flags &= ~(SND_PCM_INFO_MMAP | SND_PCM_INFO_MMAP_VALID);
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info->flags |= SND_PCM_INFO_INTERLEAVED | SND_PCM_INFO_NONINTERLEAVED;
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return 0;
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}
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static int snd_pcm_rate_params(snd_pcm_t *pcm, snd_pcm_params_t * params)
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{
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snd_pcm_rate_t *rate = pcm->private;
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snd_pcm_t *slave = rate->plug.slave;
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snd_pcm_params_t slave_params;
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snd_pcm_params_info_t slave_info;
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int srate, crate;
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int err;
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if (!snd_pcm_format_linear(params->format.sfmt)) {
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params->fail_mask = SND_PCM_PARAMS_SFMT;
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params->fail_reason = SND_PCM_PARAMS_FAIL_INVAL;
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return -EINVAL;
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}
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slave_params = *params;
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rate->cformat = params->format.sfmt;
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rate->crate = crate = params->format.rate;
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rate->cxfer_mode = params->xfer_mode;
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rate->cmmap_shape = params->mmap_shape;
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memset(&slave_info, 0, sizeof(slave_info));
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slave_info.req = *params;
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if (rate->req_sformat >= 0)
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slave_info.req.format.sfmt = rate->req_sformat;
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slave_info.req.format.rate = rate->req_srate;
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slave_info.req_mask = ~0;
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err = snd_pcm_params_info(slave, &slave_info);
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if (err < 0) {
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params->fail_mask = slave_info.req.fail_mask;
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params->fail_reason = slave_info.req.fail_reason;
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return err;
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}
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if (slave->mmap_data) {
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err = snd_pcm_munmap_data(slave);
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if (err < 0)
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return err;
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}
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|
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if (rate->req_srate - slave_info.min_rate < slave_info.max_rate - rate->req_srate)
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srate = slave_info.min_rate;
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else
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srate = slave_info.max_rate;
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slave_params.format.rate = srate;
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slave_params.avail_min = muldiv64(params->avail_min, srate, crate);
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slave_params.xfer_min = muldiv64(params->xfer_min, srate, crate);
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slave_params.buffer_size = muldiv64(params->buffer_size, srate, crate);
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slave_params.frag_size = muldiv64(params->frag_size, srate, crate);
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slave_params.xfer_align = muldiv64(params->xfer_align, srate, crate);
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slave_params.xrun_max = muldiv64(params->xrun_max, srate, crate);
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/* FIXME: boundary? */
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slave_params.xfer_mode = SND_PCM_XFER_UNSPECIFIED;
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slave_params.mmap_shape = SND_PCM_MMAP_UNSPECIFIED;;
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err = snd_pcm_params(slave, &slave_params);
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params->fail_mask = slave_params.fail_mask;
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params->fail_reason = slave_params.fail_reason;
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if (slave->valid_setup) {
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int r = snd_pcm_mmap_data(slave, NULL);
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assert(r >= 0);
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}
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return err;
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}
|
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|
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static int snd_pcm_rate_setup(snd_pcm_t *pcm, snd_pcm_setup_t * setup)
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{
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snd_pcm_rate_t *rate = pcm->private;
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int src_format, dst_format;
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int src_rate, dst_rate;
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int mul, div;
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int err = snd_pcm_setup(rate->plug.slave, setup);
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if (err < 0)
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return err;
|
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if (rate->req_sformat >= 0)
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assert(rate->req_sformat == setup->format.sfmt);
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rate->sformat = setup->format.sfmt;
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rate->srate = setup->format.rate;
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if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
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src_format = rate->cformat;
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dst_format = rate->sformat;
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src_rate = rate->crate;
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dst_rate = rate->srate;
|
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} else {
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src_format = rate->sformat;
|
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dst_format = rate->cformat;
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src_rate = rate->srate;
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dst_rate = rate->crate;
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}
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rate->get_idx = getput_index(src_format);
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rate->put_idx = getput_index(dst_format);
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if (src_rate < dst_rate) {
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rate->func = resample_expand;
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||||
/* pitch is get_threshold */
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} else {
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rate->func = resample_shrink;
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/* pitch is get_increment */
|
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}
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rate->pitch = (((u_int64_t)dst_rate * DIV) + src_rate / 2) / src_rate;
|
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if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
|
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mul = DIV;
|
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div = rate->pitch;
|
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} else {
|
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mul = rate->pitch;
|
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div = DIV;
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}
|
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rate->crate = muldiv64(rate->srate, mul, div);
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if (rate->cxfer_mode == SND_PCM_XFER_UNSPECIFIED)
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setup->xfer_mode = SND_PCM_XFER_NONINTERLEAVED;
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else
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setup->xfer_mode = rate->cxfer_mode;
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if (rate->cmmap_shape == SND_PCM_MMAP_UNSPECIFIED)
|
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setup->mmap_shape = SND_PCM_MMAP_NONINTERLEAVED;
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else
|
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setup->mmap_shape = rate->cmmap_shape;
|
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setup->format.sfmt = rate->cformat;
|
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setup->format.rate = rate->crate;
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/* FIXME */
|
||||
setup->rate_master = rate->crate;
|
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setup->rate_divisor = 1;
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setup->mmap_bytes = 0;
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setup->avail_min = muldiv64(setup->avail_min, mul, div);
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setup->xfer_min = muldiv64(setup->xfer_min, mul, div);
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setup->xrun_max = muldiv64(setup->xrun_max, mul, div);
|
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|
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/* FIXME: the three above are not a lot sensible */
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setup->buffer_size = muldiv64(setup->buffer_size, mul, div);
|
||||
setup->frag_size = muldiv64(setup->frag_size, mul, div);
|
||||
setup->xfer_align = muldiv64(setup->xfer_align, mul, div);
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||||
|
||||
/* FIXME */
|
||||
setup->boundary = LONG_MAX - LONG_MAX % setup->buffer_size;
|
||||
|
||||
if (rate->states)
|
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free(rate->states);
|
||||
rate->states = malloc(setup->format.channels * sizeof(*rate->states));
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int snd_pcm_rate_init(snd_pcm_t *pcm)
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||||
{
|
||||
snd_pcm_rate_t *rate = pcm->private;
|
||||
unsigned int k;
|
||||
for (k = 0; k < pcm->setup.format.channels; ++k) {
|
||||
rate->states[k].sum = 0;
|
||||
rate->states[k].sample = 0;
|
||||
if (rate->func == resample_expand) {
|
||||
/* Get a sample on entry */
|
||||
rate->states[k].pos = rate->pitch + DIV;
|
||||
} else {
|
||||
rate->states[k].pos = 0;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static ssize_t snd_pcm_rate_write_areas(snd_pcm_t *pcm,
|
||||
snd_pcm_channel_area_t *areas,
|
||||
size_t client_offset,
|
||||
size_t client_size,
|
||||
size_t *slave_sizep)
|
||||
{
|
||||
snd_pcm_rate_t *rate = pcm->private;
|
||||
snd_pcm_t *slave = rate->plug.slave;
|
||||
size_t client_xfer = 0;
|
||||
size_t slave_xfer = 0;
|
||||
ssize_t err = 0;
|
||||
size_t slave_size;
|
||||
if (slave_sizep)
|
||||
slave_size = *slave_sizep;
|
||||
else
|
||||
slave_size = INT_MAX;
|
||||
assert(client_size > 0 && slave_size > 0);
|
||||
while (client_xfer < client_size &&
|
||||
slave_xfer < slave_size) {
|
||||
size_t src_frames, dst_frames;
|
||||
src_frames = client_size - client_xfer;
|
||||
dst_frames = snd_pcm_mmap_playback_xfer(slave, slave_size - slave_xfer);
|
||||
src_frames = rate->func(areas, client_offset, src_frames,
|
||||
slave->mmap_areas, snd_pcm_mmap_offset(slave),
|
||||
&dst_frames,
|
||||
pcm->setup.format.channels,
|
||||
rate->get_idx, rate->put_idx,
|
||||
rate->pitch, rate->states);
|
||||
err = snd_pcm_mmap_forward(slave, dst_frames);
|
||||
if (err < 0)
|
||||
break;
|
||||
assert((size_t)err == dst_frames);
|
||||
client_offset += src_frames;
|
||||
client_xfer += src_frames;
|
||||
snd_pcm_mmap_hw_forward(pcm, src_frames);
|
||||
slave_xfer += dst_frames;
|
||||
}
|
||||
if (client_xfer > 0 || slave_xfer > 0) {
|
||||
if (slave_sizep)
|
||||
*slave_sizep = slave_xfer;
|
||||
return client_xfer;
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static ssize_t snd_pcm_rate_read_areas(snd_pcm_t *pcm,
|
||||
snd_pcm_channel_area_t *areas,
|
||||
size_t client_offset,
|
||||
size_t client_size,
|
||||
size_t *slave_sizep)
|
||||
|
||||
{
|
||||
snd_pcm_rate_t *rate = pcm->private;
|
||||
snd_pcm_t *slave = rate->plug.slave;
|
||||
size_t client_xfer = 0;
|
||||
size_t slave_xfer = 0;
|
||||
ssize_t err = 0;
|
||||
size_t slave_size;
|
||||
if (slave_sizep)
|
||||
slave_size = *slave_sizep;
|
||||
else
|
||||
slave_size = INT_MAX;
|
||||
assert(client_size > 0 && slave_size > 0);
|
||||
while (client_xfer < client_size &&
|
||||
slave_xfer < slave_size) {
|
||||
size_t src_frames, dst_frames;
|
||||
dst_frames = client_size - client_xfer;
|
||||
src_frames = snd_pcm_mmap_capture_xfer(slave, slave_size - slave_xfer);
|
||||
src_frames = rate->func(slave->mmap_areas, snd_pcm_mmap_offset(slave),
|
||||
src_frames,
|
||||
areas, client_offset, &dst_frames,
|
||||
pcm->setup.format.channels,
|
||||
rate->get_idx, rate->put_idx,
|
||||
rate->pitch, rate->states);
|
||||
err = snd_pcm_mmap_forward(slave, src_frames);
|
||||
if (err < 0)
|
||||
break;
|
||||
assert((size_t)err == src_frames);
|
||||
client_offset += dst_frames;
|
||||
client_xfer += dst_frames;
|
||||
snd_pcm_mmap_hw_forward(pcm, dst_frames);
|
||||
slave_xfer += src_frames;
|
||||
}
|
||||
if (client_xfer > 0 || slave_xfer > 0) {
|
||||
if (slave_sizep)
|
||||
*slave_sizep = slave_xfer;
|
||||
return client_xfer;
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
size_t snd_pcm_rate_client_frames(snd_pcm_t *pcm, size_t frames)
|
||||
{
|
||||
snd_pcm_rate_t *rate = pcm->private;
|
||||
/* Round toward zero */
|
||||
if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
|
||||
return (int64_t)frames * DIV / rate->pitch;
|
||||
else
|
||||
return (int64_t)frames * rate->pitch / DIV;
|
||||
}
|
||||
|
||||
static void snd_pcm_rate_dump(snd_pcm_t *pcm, FILE *fp)
|
||||
{
|
||||
snd_pcm_rate_t *rate = pcm->private;
|
||||
if (rate->req_sformat < 0)
|
||||
fprintf(fp, "Rate conversion PCM (%d)\n",
|
||||
rate->req_srate);
|
||||
else
|
||||
fprintf(fp, "Rate conversion PCM (%d, sformat=%s)\n",
|
||||
rate->req_srate,
|
||||
snd_pcm_format_name(rate->req_sformat));
|
||||
if (pcm->valid_setup) {
|
||||
fprintf(fp, "Its setup is:\n");
|
||||
snd_pcm_dump_setup(pcm, fp);
|
||||
}
|
||||
fprintf(fp, "Slave: ");
|
||||
snd_pcm_dump(rate->plug.slave, fp);
|
||||
}
|
||||
|
||||
struct snd_pcm_ops snd_pcm_rate_ops = {
|
||||
close: snd_pcm_rate_close,
|
||||
info: snd_pcm_plugin_info,
|
||||
params_info: snd_pcm_rate_params_info,
|
||||
params: snd_pcm_rate_params,
|
||||
setup: snd_pcm_rate_setup,
|
||||
channel_info: snd_pcm_plugin_channel_info,
|
||||
channel_params: snd_pcm_plugin_channel_params,
|
||||
channel_setup: snd_pcm_plugin_channel_setup,
|
||||
dump: snd_pcm_rate_dump,
|
||||
nonblock: snd_pcm_plugin_nonblock,
|
||||
mmap_status: snd_pcm_plugin_mmap_status,
|
||||
mmap_control: snd_pcm_plugin_mmap_control,
|
||||
mmap_data: snd_pcm_plugin_mmap_data,
|
||||
munmap_status: snd_pcm_plugin_munmap_status,
|
||||
munmap_control: snd_pcm_plugin_munmap_control,
|
||||
munmap_data: snd_pcm_plugin_munmap_data,
|
||||
};
|
||||
|
||||
int snd_pcm_rate_open(snd_pcm_t **handlep, int sformat, int srate, snd_pcm_t *slave, int close_slave)
|
||||
{
|
||||
snd_pcm_t *handle;
|
||||
snd_pcm_rate_t *rate;
|
||||
int err;
|
||||
assert(handlep && slave);
|
||||
if (sformat >= 0 && snd_pcm_format_linear(sformat) != 1)
|
||||
return -EINVAL;
|
||||
rate = calloc(1, sizeof(snd_pcm_rate_t));
|
||||
if (!rate) {
|
||||
return -ENOMEM;
|
||||
}
|
||||
rate->req_srate = srate;
|
||||
rate->req_sformat = sformat;
|
||||
rate->plug.read = snd_pcm_rate_read_areas;
|
||||
rate->plug.write = snd_pcm_rate_write_areas;
|
||||
rate->plug.client_frames = snd_pcm_rate_client_frames;
|
||||
rate->plug.init = snd_pcm_rate_init;
|
||||
rate->plug.slave = slave;
|
||||
rate->plug.close_slave = close_slave;
|
||||
|
||||
handle = calloc(1, sizeof(snd_pcm_t));
|
||||
if (!handle) {
|
||||
free(rate);
|
||||
return -ENOMEM;
|
||||
}
|
||||
handle->type = SND_PCM_TYPE_RATE;
|
||||
handle->stream = slave->stream;
|
||||
handle->ops = &snd_pcm_rate_ops;
|
||||
handle->op_arg = handle;
|
||||
handle->fast_ops = &snd_pcm_plugin_fast_ops;
|
||||
handle->fast_op_arg = handle;
|
||||
handle->mode = slave->mode;
|
||||
handle->private = rate;
|
||||
err = snd_pcm_init(handle);
|
||||
if (err < 0) {
|
||||
snd_pcm_close(handle);
|
||||
return err;
|
||||
}
|
||||
*handlep = handle;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int _snd_pcm_rate_open(snd_pcm_t **pcmp, char *name,
|
||||
snd_config_t *conf,
|
||||
int stream, int mode)
|
||||
{
|
||||
snd_config_iterator_t i;
|
||||
char *sname = NULL;
|
||||
int err;
|
||||
snd_pcm_t *spcm;
|
||||
int sformat = -1;
|
||||
long srate = -1;
|
||||
snd_config_foreach(i, conf) {
|
||||
snd_config_t *n = snd_config_entry(i);
|
||||
if (strcmp(n->id, "comment") == 0)
|
||||
continue;
|
||||
if (strcmp(n->id, "type") == 0)
|
||||
continue;
|
||||
if (strcmp(n->id, "stream") == 0)
|
||||
continue;
|
||||
if (strcmp(n->id, "sname") == 0) {
|
||||
err = snd_config_string_get(n, &sname);
|
||||
if (err < 0)
|
||||
return -EINVAL;
|
||||
continue;
|
||||
}
|
||||
if (strcmp(n->id, "sformat") == 0) {
|
||||
char *f;
|
||||
err = snd_config_string_get(n, &f);
|
||||
if (err < 0)
|
||||
return -EINVAL;
|
||||
sformat = snd_pcm_format_value(f);
|
||||
if (sformat < 0)
|
||||
return -EINVAL;
|
||||
if (snd_pcm_format_linear(sformat) != 1)
|
||||
return -EINVAL;
|
||||
continue;
|
||||
}
|
||||
if (strcmp(n->id, "srate") == 0) {
|
||||
err = snd_config_integer_get(n, &srate);
|
||||
if (err < 0)
|
||||
return -EINVAL;
|
||||
continue;
|
||||
}
|
||||
return -EINVAL;
|
||||
}
|
||||
if (!sname || !srate)
|
||||
return -EINVAL;
|
||||
/* This is needed cause snd_config_update may destroy config */
|
||||
sname = strdup(sname);
|
||||
if (!sname)
|
||||
return -ENOMEM;
|
||||
err = snd_pcm_open(&spcm, sname, stream, mode);
|
||||
free(sname);
|
||||
if (err < 0)
|
||||
return err;
|
||||
err = snd_pcm_rate_open(pcmp, sformat, srate, spcm, 1);
|
||||
if (err < 0)
|
||||
snd_pcm_close(spcm);
|
||||
return err;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue