mirror of
https://github.com/alsa-project/alsa-lib.git
synced 2025-11-16 06:59:57 -05:00
ffdb04c3ea
Fixed the bug producing silent tones with some combinations of plugins. The internal buffer handling is now better (cleaner) integrated with snd_pcm_generic_*().
1545 lines
47 KiB
C
1545 lines
47 KiB
C
/**
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* \file pcm/pcm_rate.c
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* \ingroup PCM_Plugins
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* \brief PCM Rate Plugin Interface
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* \author Abramo Bagnara <abramo@alsa-project.org>
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* \author Jaroslav Kysela <perex@suse.cz>
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* \date 2000-2004
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*/
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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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* 2004 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 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 <inttypes.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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#include "iatomic.h"
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#if 0
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#define DEBUG_REFINE
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#endif
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#ifndef PIC
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/* entry for static linking */
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const char *_snd_module_pcm_rate = "";
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#endif
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#ifndef DOC_HIDDEN
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/* LINEAR_DIV needs to be large enough to handle resampling from 192000 -> 8000 */
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#define LINEAR_DIV_SHIFT 19
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#define LINEAR_DIV (1<<LINEAR_DIV_SHIFT)
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enum rate_type {
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RATE_TYPE_LINEAR, /* linear interpolation */
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RATE_TYPE_BANDLIMIT, /* bandlimited interpolation */
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RATE_TYPE_POLYPHASE, /* polyphase resampling */
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};
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typedef struct _snd_pcm_rate snd_pcm_rate_t;
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typedef void (*rate_f)(const snd_pcm_channel_area_t *dst_areas,
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snd_pcm_uframes_t dst_offset,
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snd_pcm_uframes_t dst_frames,
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const snd_pcm_channel_area_t *src_areas,
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snd_pcm_uframes_t src_offset,
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snd_pcm_uframes_t src_frames,
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unsigned int channels,
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snd_pcm_rate_t *rate);
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struct _snd_pcm_rate {
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snd_pcm_generic_t gen;
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snd_atomic_write_t watom;
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snd_pcm_uframes_t appl_ptr, hw_ptr;
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snd_pcm_uframes_t last_commit_ptr;
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snd_pcm_uframes_t orig_avail_min;
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snd_pcm_sw_params_t sw_params;
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enum rate_type type;
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unsigned int get_idx;
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unsigned int put_idx;
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unsigned int pitch;
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unsigned int pitch_shift; /* for expand interpolation */
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rate_f func;
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snd_pcm_format_t sformat;
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unsigned int srate;
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snd_pcm_channel_area_t *pareas; /* areas for splitted period (rate pcm) */
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snd_pcm_channel_area_t *sareas; /* areas for splitted period (slave pcm) */
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int16_t *old_sample;
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};
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static void snd_pcm_rate_expand(const snd_pcm_channel_area_t *dst_areas,
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snd_pcm_uframes_t dst_offset, snd_pcm_uframes_t dst_frames,
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const snd_pcm_channel_area_t *src_areas,
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snd_pcm_uframes_t src_offset, snd_pcm_uframes_t src_frames,
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unsigned int channels,
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snd_pcm_rate_t *rate)
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{
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#define GET16_LABELS
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#define PUT16_LABELS
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#include "plugin_ops.h"
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#undef GET16_LABELS
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#undef PUT16_LABELS
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void *get = get16_labels[rate->get_idx];
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void *put = put16_labels[rate->put_idx];
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unsigned int get_threshold = rate->pitch;
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unsigned int channel;
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snd_pcm_uframes_t src_frames1;
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snd_pcm_uframes_t dst_frames1;
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int16_t sample = 0;
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unsigned int pos;
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for (channel = 0; channel < channels; ++channel) {
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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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const char *src;
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char *dst;
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int src_step, dst_step;
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int16_t old_sample = 0;
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int16_t new_sample;
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int old_weight, new_weight;
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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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new_sample = rate->old_sample[channel];
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pos = get_threshold;
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while (dst_frames1 < dst_frames) {
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if (pos >= get_threshold) {
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pos -= get_threshold;
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old_sample = new_sample;
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if (src_frames1 < src_frames) {
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goto *get;
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#define GET16_END after_get
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#include "plugin_ops.h"
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#undef GET16_END
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after_get:
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new_sample = sample;
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}
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}
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new_weight = (pos << (16 - rate->pitch_shift)) / (get_threshold >> rate->pitch_shift);
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old_weight = 0x10000 - new_weight;
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sample = (old_sample * old_weight + new_sample * new_weight) >> 16;
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goto *put;
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#define PUT16_END after_put
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#include "plugin_ops.h"
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#undef PUT16_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 += LINEAR_DIV;
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if (pos >= get_threshold) {
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src += src_step;
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src_frames1++;
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}
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}
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rate->old_sample[channel] = new_sample;
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}
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}
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/* optimized version for S16 format */
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static void snd_pcm_rate_expand_s16(const snd_pcm_channel_area_t *dst_areas,
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snd_pcm_uframes_t dst_offset, snd_pcm_uframes_t dst_frames,
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const snd_pcm_channel_area_t *src_areas,
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snd_pcm_uframes_t src_offset, snd_pcm_uframes_t src_frames,
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unsigned int channels,
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snd_pcm_rate_t *rate)
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{
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unsigned int channel;
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snd_pcm_uframes_t src_frames1;
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snd_pcm_uframes_t dst_frames1;
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unsigned int get_threshold = rate->pitch;
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unsigned int pos;
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for (channel = 0; channel < channels; ++channel) {
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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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const int16_t *src;
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int16_t *dst;
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int src_step, dst_step;
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int16_t old_sample = 0;
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int16_t new_sample;
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int old_weight, new_weight;
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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) >> 1;
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dst_step = snd_pcm_channel_area_step(dst_area) >> 1;
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src_frames1 = 0;
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dst_frames1 = 0;
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new_sample = rate->old_sample[channel];
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pos = get_threshold;
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while (dst_frames1 < dst_frames) {
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if (pos >= get_threshold) {
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pos -= get_threshold;
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old_sample = new_sample;
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if (src_frames1 < src_frames)
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new_sample = *src;
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}
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new_weight = (pos << (16 - rate->pitch_shift)) / (get_threshold >> rate->pitch_shift);
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old_weight = 0x10000 - new_weight;
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*dst = (old_sample * old_weight + new_sample * new_weight) >> 16;
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dst += dst_step;
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dst_frames1++;
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pos += LINEAR_DIV;
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if (pos >= get_threshold) {
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src += src_step;
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src_frames1++;
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}
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}
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rate->old_sample[channel] = new_sample;
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}
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}
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static void snd_pcm_rate_shrink(const snd_pcm_channel_area_t *dst_areas,
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snd_pcm_uframes_t dst_offset, snd_pcm_uframes_t dst_frames,
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const snd_pcm_channel_area_t *src_areas,
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snd_pcm_uframes_t src_offset, snd_pcm_uframes_t src_frames,
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unsigned int channels,
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snd_pcm_rate_t *rate)
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{
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#define GET16_LABELS
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#define PUT16_LABELS
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#include "plugin_ops.h"
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#undef GET16_LABELS
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#undef PUT16_LABELS
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void *get = get16_labels[rate->get_idx];
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void *put = put16_labels[rate->put_idx];
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unsigned int get_increment = rate->pitch;
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unsigned int channel;
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snd_pcm_uframes_t src_frames1;
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snd_pcm_uframes_t dst_frames1;
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int16_t sample = 0;
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unsigned int pos;
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for (channel = 0; channel < channels; ++channel) {
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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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const char *src;
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char *dst;
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int src_step, dst_step;
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int16_t old_sample = 0;
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int16_t new_sample = 0;
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int old_weight, new_weight;
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pos = LINEAR_DIV - get_increment; /* Force first sample to be copied */
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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 GET16_END after_get
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#include "plugin_ops.h"
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#undef GET16_END
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after_get:
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new_sample = sample;
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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 >= LINEAR_DIV) {
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pos -= LINEAR_DIV;
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old_weight = (pos << (32 - LINEAR_DIV_SHIFT)) / (get_increment >> (LINEAR_DIV_SHIFT - 16));
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new_weight = 0x10000 - old_weight;
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sample = (old_sample * old_weight + new_sample * new_weight) >> 16;
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goto *put;
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#define PUT16_END after_put
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#include "plugin_ops.h"
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#undef PUT16_END
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after_put:
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dst += dst_step;
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dst_frames1++;
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if (CHECK_SANITY(dst_frames1 > dst_frames)) {
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SNDERR("dst_frames overflow");
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break;
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}
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}
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old_sample = new_sample;
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}
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}
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}
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/* optimized version for S16 format */
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static void snd_pcm_rate_shrink_s16(const snd_pcm_channel_area_t *dst_areas,
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snd_pcm_uframes_t dst_offset, snd_pcm_uframes_t dst_frames,
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const snd_pcm_channel_area_t *src_areas,
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snd_pcm_uframes_t src_offset, snd_pcm_uframes_t src_frames,
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unsigned int channels,
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snd_pcm_rate_t *rate)
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{
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unsigned int get_increment = rate->pitch;
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unsigned int channel;
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snd_pcm_uframes_t src_frames1;
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snd_pcm_uframes_t dst_frames1;
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unsigned int pos = 0;
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for (channel = 0; channel < channels; ++channel) {
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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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const int16_t *src;
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int16_t *dst;
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int src_step, dst_step;
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int16_t old_sample = 0;
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int16_t new_sample = 0;
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int old_weight, new_weight;
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pos = LINEAR_DIV - get_increment; /* Force first sample to be copied */
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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) >> 1;
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dst_step = snd_pcm_channel_area_step(dst_area) >> 1 ;
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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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new_sample = *src;
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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 >= LINEAR_DIV) {
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pos -= LINEAR_DIV;
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old_weight = (pos << (32 - LINEAR_DIV_SHIFT)) / (get_increment >> (LINEAR_DIV_SHIFT - 16));
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new_weight = 0x10000 - old_weight;
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*dst = (old_sample * old_weight + new_sample * new_weight) >> 16;
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dst += dst_step;
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dst_frames1++;
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if (CHECK_SANITY(dst_frames1 > dst_frames)) {
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SNDERR("dst_frames overflow");
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break;
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}
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}
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old_sample = new_sample;
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}
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}
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}
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#endif /* DOC_HIDDEN */
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static snd_pcm_sframes_t snd_pcm_rate_client_frames(snd_pcm_t *pcm, snd_pcm_sframes_t frames)
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{
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snd_pcm_rate_t *rate = pcm->private_data;
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if (frames == 0)
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return 0;
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/* Round toward zero */
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if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
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return muldiv_near(frames, LINEAR_DIV, rate->pitch);
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else
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return muldiv_near(frames, rate->pitch, LINEAR_DIV);
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}
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static snd_pcm_sframes_t snd_pcm_rate_slave_frames(snd_pcm_t *pcm, snd_pcm_sframes_t frames)
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{
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snd_pcm_rate_t *rate = pcm->private_data;
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/* Round toward zero */
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if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
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return muldiv_near(frames, rate->pitch, LINEAR_DIV);
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else
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return muldiv_near(frames, LINEAR_DIV, rate->pitch);
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}
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static int snd_pcm_rate_hw_refine_cprepare(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_hw_params_t *params)
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{
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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 format_mask = { SND_PCM_FMTBIT_LINEAR };
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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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&format_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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err = _snd_pcm_hw_param_set_min(params,
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SND_PCM_HW_PARAM_RATE, SND_PCM_PLUGIN_RATE_MIN, 0);
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if (err < 0)
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return err;
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err = _snd_pcm_hw_param_set_max(params,
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SND_PCM_HW_PARAM_RATE, SND_PCM_PLUGIN_RATE_MAX, 0);
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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_rate_hw_refine_sprepare(snd_pcm_t *pcm, snd_pcm_hw_params_t *sparams)
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{
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snd_pcm_rate_t *rate = 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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if (rate->sformat != SND_PCM_FORMAT_UNKNOWN) {
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_snd_pcm_hw_params_set_format(sparams, rate->sformat);
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_snd_pcm_hw_params_set_subformat(sparams, SND_PCM_SUBFORMAT_STD);
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}
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_snd_pcm_hw_param_set_minmax(sparams, SND_PCM_HW_PARAM_RATE,
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rate->srate, 0, rate->srate + 1, -1);
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return 0;
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}
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static int snd_pcm_rate_hw_refine_schange(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
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snd_pcm_hw_params_t *sparams)
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{
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snd_pcm_rate_t *rate = pcm->private_data;
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snd_interval_t t, buffer_size;
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const snd_interval_t *srate, *crate;
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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_PERIOD_TIME |
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SND_PCM_HW_PARBIT_TICK_TIME);
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if (rate->sformat == SND_PCM_FORMAT_UNKNOWN)
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links |= (SND_PCM_HW_PARBIT_FORMAT |
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SND_PCM_HW_PARBIT_SUBFORMAT |
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SND_PCM_HW_PARBIT_SAMPLE_BITS |
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SND_PCM_HW_PARBIT_FRAME_BITS);
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snd_interval_copy(&buffer_size, snd_pcm_hw_param_get_interval(params, SND_PCM_HW_PARAM_BUFFER_SIZE));
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snd_interval_unfloor(&buffer_size);
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crate = snd_pcm_hw_param_get_interval(params, SND_PCM_HW_PARAM_RATE);
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srate = snd_pcm_hw_param_get_interval(sparams, SND_PCM_HW_PARAM_RATE);
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snd_interval_muldiv(&buffer_size, srate, crate, &t);
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err = _snd_pcm_hw_param_set_interval(sparams, SND_PCM_HW_PARAM_BUFFER_SIZE, &t);
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if (err < 0)
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return err;
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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_rate_hw_refine_cchange(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
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snd_pcm_hw_params_t *sparams)
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{
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snd_pcm_rate_t *rate = pcm->private_data;
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snd_interval_t t;
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#ifdef DEBUG_REFINE
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snd_output_t *out;
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#endif
|
|
const snd_interval_t *sbuffer_size, *buffer_size;
|
|
const snd_interval_t *srate, *crate;
|
|
int err;
|
|
unsigned int links = (SND_PCM_HW_PARBIT_CHANNELS |
|
|
SND_PCM_HW_PARBIT_PERIOD_TIME |
|
|
SND_PCM_HW_PARBIT_TICK_TIME);
|
|
if (rate->sformat == SND_PCM_FORMAT_UNKNOWN)
|
|
links |= (SND_PCM_HW_PARBIT_FORMAT |
|
|
SND_PCM_HW_PARBIT_SUBFORMAT |
|
|
SND_PCM_HW_PARBIT_SAMPLE_BITS |
|
|
SND_PCM_HW_PARBIT_FRAME_BITS);
|
|
sbuffer_size = snd_pcm_hw_param_get_interval(sparams, SND_PCM_HW_PARAM_BUFFER_SIZE);
|
|
crate = snd_pcm_hw_param_get_interval(params, SND_PCM_HW_PARAM_RATE);
|
|
srate = snd_pcm_hw_param_get_interval(sparams, SND_PCM_HW_PARAM_RATE);
|
|
snd_interval_muldiv(sbuffer_size, crate, srate, &t);
|
|
snd_interval_floor(&t);
|
|
err = _snd_pcm_hw_param_set_interval(params, SND_PCM_HW_PARAM_BUFFER_SIZE, &t);
|
|
if (err < 0)
|
|
return err;
|
|
buffer_size = snd_pcm_hw_param_get_interval(params, SND_PCM_HW_PARAM_BUFFER_SIZE);
|
|
/*
|
|
* this condition probably needs more work:
|
|
* in case when the buffer_size is known and we are looking
|
|
* for best period_size, we should prefer situation when
|
|
* (buffer_size / period_size) * period_size == buffer_size
|
|
*/
|
|
if (snd_interval_single(buffer_size) && buffer_size->integer) {
|
|
snd_interval_t *period_size;
|
|
period_size = (snd_interval_t *)snd_pcm_hw_param_get_interval(params, SND_PCM_HW_PARAM_PERIOD_SIZE);
|
|
if (!snd_interval_checkempty(period_size) &&
|
|
period_size->openmin && period_size->openmax &&
|
|
period_size->min + 1 == period_size->max) {
|
|
if ((buffer_size->min / period_size->min) * period_size->min == buffer_size->min) {
|
|
snd_interval_set_value(period_size, period_size->min);
|
|
} else if ((buffer_size->max / period_size->max) * period_size->max == buffer_size->max) {
|
|
snd_interval_set_value(period_size, period_size->max);
|
|
}
|
|
}
|
|
}
|
|
#ifdef DEBUG_REFINE
|
|
snd_output_stdio_attach(&out, stderr, 0);
|
|
snd_output_printf(out, "REFINE (params):\n");
|
|
snd_pcm_hw_params_dump(params, out);
|
|
snd_output_printf(out, "REFINE (slave params):\n");
|
|
snd_pcm_hw_params_dump(sparams, out);
|
|
snd_output_close(out);
|
|
#endif
|
|
err = _snd_pcm_hw_params_refine(params, links, sparams);
|
|
#ifdef DEBUG_REFINE
|
|
snd_output_stdio_attach(&out, stderr, 0);
|
|
snd_output_printf(out, "********************\n");
|
|
snd_output_printf(out, "REFINE (params) (%i):\n", err);
|
|
snd_pcm_hw_params_dump(params, out);
|
|
snd_output_printf(out, "REFINE (slave params):\n");
|
|
snd_pcm_hw_params_dump(sparams, out);
|
|
snd_output_close(out);
|
|
#endif
|
|
if (err < 0)
|
|
return err;
|
|
return 0;
|
|
}
|
|
|
|
static int snd_pcm_rate_hw_refine(snd_pcm_t *pcm,
|
|
snd_pcm_hw_params_t *params)
|
|
{
|
|
return snd_pcm_hw_refine_slave(pcm, params,
|
|
snd_pcm_rate_hw_refine_cprepare,
|
|
snd_pcm_rate_hw_refine_cchange,
|
|
snd_pcm_rate_hw_refine_sprepare,
|
|
snd_pcm_rate_hw_refine_schange,
|
|
snd_pcm_generic_hw_refine);
|
|
}
|
|
|
|
static int snd_pcm_rate_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_t *slave = rate->gen.slave;
|
|
snd_pcm_format_t src_format, dst_format, pformat, sformat;
|
|
unsigned int src_rate, dst_rate, channels, pwidth, swidth, chn;
|
|
snd_pcm_uframes_t period_size, buffer_size;
|
|
int err = snd_pcm_hw_params_slave(pcm, params,
|
|
snd_pcm_rate_hw_refine_cchange,
|
|
snd_pcm_rate_hw_refine_sprepare,
|
|
snd_pcm_rate_hw_refine_schange,
|
|
snd_pcm_generic_hw_params);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
err = INTERNAL(snd_pcm_hw_params_get_format)(params, &src_format);
|
|
if (err < 0)
|
|
return err;
|
|
pformat = src_format;
|
|
dst_format = slave->format;
|
|
sformat = dst_format;
|
|
dst_rate = slave->rate;
|
|
err = INTERNAL(snd_pcm_hw_params_get_rate)(params, &src_rate, 0);
|
|
} else {
|
|
sformat = src_format = slave->format;
|
|
err = INTERNAL(snd_pcm_hw_params_get_format)(params, &dst_format);
|
|
if (err < 0)
|
|
return err;
|
|
pformat = dst_format;
|
|
src_rate = slave->rate;
|
|
err = INTERNAL(snd_pcm_hw_params_get_rate)(params, &dst_rate, 0);
|
|
}
|
|
if (err < 0)
|
|
return err;
|
|
err = INTERNAL(snd_pcm_hw_params_get_period_size)(params, &period_size, 0);
|
|
if (err < 0)
|
|
return err;
|
|
err = INTERNAL(snd_pcm_hw_params_get_buffer_size)(params, &buffer_size);
|
|
if (err < 0)
|
|
return err;
|
|
err = INTERNAL(snd_pcm_hw_params_get_channels)(params, &channels);
|
|
if (err < 0)
|
|
return err;
|
|
rate->get_idx = snd_pcm_linear_get_index(src_format, SND_PCM_FORMAT_S16);
|
|
rate->put_idx = snd_pcm_linear_put_index(SND_PCM_FORMAT_S16, dst_format);
|
|
if (src_rate < dst_rate) {
|
|
if (src_format == dst_format && src_format == SND_PCM_FORMAT_S16)
|
|
rate->func = snd_pcm_rate_expand_s16;
|
|
else
|
|
rate->func = snd_pcm_rate_expand;
|
|
/* pitch is get_threshold */
|
|
} else {
|
|
if (src_format == dst_format && src_format == SND_PCM_FORMAT_S16)
|
|
rate->func = snd_pcm_rate_shrink_s16;
|
|
else
|
|
rate->func = snd_pcm_rate_shrink;
|
|
/* pitch is get_increment */
|
|
}
|
|
rate->pitch = (((u_int64_t)dst_rate * LINEAR_DIV) + (src_rate / 2)) / src_rate;
|
|
if (CHECK_SANITY(rate->pareas)) {
|
|
SNDMSG("rate plugin already in use");
|
|
return -EBUSY;
|
|
}
|
|
#if 0
|
|
if ((buffer_size / period_size) * period_size == buffer_size &&
|
|
(slave->buffer_size / slave->period_size) * slave->period_size == slave->buffer_size)
|
|
return 0;
|
|
#endif
|
|
rate->pareas = malloc(2 * channels * sizeof(*rate->pareas));
|
|
if (rate->pareas == NULL)
|
|
return -ENOMEM;
|
|
free(rate->old_sample);
|
|
rate->old_sample = malloc(sizeof(*rate->old_sample) * channels);
|
|
if (rate->old_sample == NULL)
|
|
return -ENOMEM;
|
|
pwidth = snd_pcm_format_physical_width(pformat);
|
|
swidth = snd_pcm_format_physical_width(sformat);
|
|
rate->pareas[0].addr = malloc(((pwidth * channels * period_size) / 8) +
|
|
((swidth * channels * slave->period_size) / 8));
|
|
if (rate->pareas[0].addr == NULL) {
|
|
free(rate->pareas);
|
|
return -ENOMEM;
|
|
}
|
|
rate->sareas = rate->pareas + channels;
|
|
rate->sareas[0].addr = (char *)rate->pareas[0].addr + ((pwidth * channels * period_size) / 8);
|
|
for (chn = 0; chn < channels; chn++) {
|
|
rate->pareas[chn].addr = rate->pareas[0].addr + (pwidth * chn * period_size) / 8;
|
|
rate->pareas[chn].first = 0;
|
|
rate->pareas[chn].step = pwidth;
|
|
rate->sareas[chn].addr = rate->sareas[0].addr + (swidth * chn * slave->period_size) / 8;
|
|
rate->sareas[chn].first = 0;
|
|
rate->sareas[chn].step = swidth;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int snd_pcm_rate_hw_free(snd_pcm_t *pcm)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
if (rate->pareas) {
|
|
free(rate->pareas[0].addr);
|
|
free(rate->pareas);
|
|
rate->pareas = NULL;
|
|
rate->sareas = NULL;
|
|
}
|
|
free(rate->old_sample);
|
|
return snd_pcm_hw_free(rate->gen.slave);
|
|
}
|
|
|
|
static void recalc(snd_pcm_t *pcm, snd_pcm_uframes_t *val)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_t *slave = rate->gen.slave;
|
|
unsigned long div;
|
|
|
|
if (*val == pcm->buffer_size) {
|
|
*val = slave->buffer_size;
|
|
} else {
|
|
div = *val / pcm->period_size;
|
|
if (div * pcm->period_size == *val)
|
|
*val = div * slave->period_size;
|
|
else
|
|
*val = muldiv_near(*val, slave->period_size, pcm->period_size);
|
|
}
|
|
}
|
|
|
|
static int snd_pcm_rate_sw_params(snd_pcm_t *pcm, snd_pcm_sw_params_t * params)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_t *slave = rate->gen.slave;
|
|
snd_pcm_sw_params_t *sparams;
|
|
snd_pcm_uframes_t boundary1, boundary2;
|
|
|
|
rate->sw_params = *params;
|
|
sparams = &rate->sw_params;
|
|
if ((rate->pitch >= LINEAR_DIV ? 1 : 0) ^ (pcm->stream == SND_PCM_STREAM_CAPTURE ? 1 : 0)) {
|
|
boundary1 = pcm->buffer_size;
|
|
boundary2 = slave->buffer_size;
|
|
while (boundary2 * 2 <= LONG_MAX - slave->buffer_size) {
|
|
boundary1 *= 2;
|
|
boundary2 *= 2;
|
|
}
|
|
} else {
|
|
boundary1 = pcm->buffer_size;
|
|
boundary2 = slave->buffer_size;
|
|
while (boundary1 * 2 <= LONG_MAX - pcm->buffer_size) {
|
|
boundary1 *= 2;
|
|
boundary2 *= 2;
|
|
}
|
|
}
|
|
params->boundary = boundary1;
|
|
sparams->boundary = boundary2;
|
|
if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
rate->pitch = (((u_int64_t)slave->period_size * LINEAR_DIV) + (pcm->period_size/2) ) / pcm->period_size;
|
|
do {
|
|
snd_pcm_uframes_t cframes,cframes_test;
|
|
|
|
cframes = snd_pcm_rate_client_frames(pcm, slave->period_size );
|
|
if (cframes == pcm->period_size )
|
|
break;
|
|
if (cframes > pcm->period_size ) {
|
|
rate->pitch++;
|
|
cframes_test = snd_pcm_rate_client_frames(pcm, slave->period_size );
|
|
if (cframes_test < pcm->period_size ) {
|
|
SNDERR("Unable to satisfy pitch condition (%i/%i - %li/%li)\n", slave->rate, pcm->rate, slave->period_size, pcm->period_size);
|
|
return -EIO;
|
|
}
|
|
} else {
|
|
rate->pitch--;
|
|
cframes_test = snd_pcm_rate_client_frames(pcm, slave->period_size );
|
|
if (cframes_test > pcm->period_size) {
|
|
SNDERR("Unable to satisfy pitch condition (%i/%i - %li/%li)\n", slave->rate, pcm->rate, slave->period_size, pcm->period_size);
|
|
return -EIO;
|
|
}
|
|
}
|
|
} while (1);
|
|
if ((snd_pcm_uframes_t)snd_pcm_rate_client_frames(pcm, slave->period_size ) != pcm->period_size) {
|
|
SNDERR("invalid slave period_size %ld for pcm period_size %ld",
|
|
slave->period_size, pcm->period_size);
|
|
return -EIO;
|
|
}
|
|
} else {
|
|
rate->pitch = (((u_int64_t)pcm->period_size * LINEAR_DIV) + (slave->period_size/2) ) / slave->period_size;
|
|
do {
|
|
snd_pcm_uframes_t cframes;
|
|
|
|
cframes = snd_pcm_rate_slave_frames(pcm, pcm->period_size );
|
|
if (cframes == slave->period_size )
|
|
break;
|
|
if (cframes > slave->period_size ) {
|
|
rate->pitch++;
|
|
if ((snd_pcm_uframes_t)snd_pcm_rate_slave_frames(pcm, pcm->period_size ) < slave->period_size ) {
|
|
SNDERR("Unable to satisfy pitch condition (%i/%i - %li/%li)\n", slave->rate, pcm->rate, slave->period_size, pcm->period_size);
|
|
return -EIO;
|
|
}
|
|
} else {
|
|
rate->pitch--;
|
|
if ((snd_pcm_uframes_t)snd_pcm_rate_slave_frames(pcm, pcm->period_size) > slave->period_size ) {
|
|
SNDERR("Unable to satisfy pitch condition (%i/%i - %li/%li)\n", slave->rate, pcm->rate, slave->period_size , pcm->period_size );
|
|
return -EIO;
|
|
}
|
|
}
|
|
} while (1);
|
|
if ((snd_pcm_uframes_t)snd_pcm_rate_slave_frames(pcm, pcm->period_size ) != slave->period_size) {
|
|
SNDERR("invalid pcm period_size %ld for slave period_size",
|
|
pcm->period_size, slave->period_size);
|
|
return -EIO;
|
|
}
|
|
}
|
|
if (rate->pitch >= LINEAR_DIV) {
|
|
/* shift for expand linear interpolation */
|
|
rate->pitch_shift = 0;
|
|
while ((rate->pitch >> rate->pitch_shift) >= (1 << 16))
|
|
rate->pitch_shift++;
|
|
}
|
|
recalc(pcm, &sparams->avail_min);
|
|
rate->orig_avail_min = sparams->avail_min;
|
|
recalc(pcm, &sparams->xfer_align);
|
|
recalc(pcm, &sparams->start_threshold);
|
|
if (sparams->avail_min < 1) sparams->avail_min = 1;
|
|
if (sparams->xfer_align < 1) sparams->xfer_align = 1;
|
|
if (sparams->start_threshold <= slave->buffer_size) {
|
|
if (sparams->start_threshold > (slave->buffer_size / sparams->avail_min) * sparams->avail_min)
|
|
sparams->start_threshold = (slave->buffer_size / sparams->avail_min) * sparams->avail_min;
|
|
if (sparams->start_threshold > (slave->buffer_size / sparams->xfer_align) * sparams->xfer_align)
|
|
sparams->start_threshold = (slave->buffer_size / sparams->xfer_align) * sparams->xfer_align;
|
|
}
|
|
if (sparams->stop_threshold >= sparams->boundary) {
|
|
sparams->stop_threshold = sparams->boundary;
|
|
} else {
|
|
recalc(pcm, &sparams->stop_threshold);
|
|
}
|
|
recalc(pcm, &sparams->silence_threshold);
|
|
recalc(pcm, &sparams->silence_size);
|
|
return snd_pcm_sw_params(slave, sparams);
|
|
}
|
|
|
|
static int snd_pcm_rate_init(snd_pcm_t *pcm)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
switch (rate->type) {
|
|
case RATE_TYPE_LINEAR:
|
|
/* for expand */
|
|
if (rate->old_sample)
|
|
memset(rate->old_sample, 0, sizeof(*rate->old_sample) * pcm->channels);
|
|
break;
|
|
default:
|
|
assert(0);
|
|
}
|
|
rate->last_commit_ptr = 0;
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
snd_pcm_rate_write_areas1(snd_pcm_t *pcm,
|
|
const snd_pcm_channel_area_t *areas,
|
|
snd_pcm_uframes_t offset,
|
|
const snd_pcm_channel_area_t *slave_areas,
|
|
snd_pcm_uframes_t slave_offset)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
rate->func(slave_areas, slave_offset, rate->gen.slave->period_size,
|
|
areas, offset, pcm->period_size,
|
|
pcm->channels, rate);
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
snd_pcm_rate_read_areas1(snd_pcm_t *pcm,
|
|
const snd_pcm_channel_area_t *areas,
|
|
snd_pcm_uframes_t offset,
|
|
const snd_pcm_channel_area_t *slave_areas,
|
|
snd_pcm_uframes_t slave_offset)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
rate->func(areas, offset, pcm->period_size,
|
|
slave_areas, slave_offset, rate->gen.slave->period_size,
|
|
pcm->channels, rate);
|
|
return 0;
|
|
}
|
|
|
|
static inline snd_pcm_sframes_t snd_pcm_rate_move_applptr(snd_pcm_t *pcm, snd_pcm_sframes_t frames)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_uframes_t orig_appl_ptr, appl_ptr = rate->appl_ptr, slave_appl_ptr;
|
|
snd_pcm_sframes_t diff, ndiff;
|
|
snd_pcm_t *slave = rate->gen.slave;
|
|
|
|
orig_appl_ptr = rate->appl_ptr;
|
|
if (frames > 0)
|
|
snd_pcm_mmap_appl_forward(pcm, frames);
|
|
else
|
|
snd_pcm_mmap_appl_backward(pcm, -frames);
|
|
slave_appl_ptr =
|
|
(appl_ptr / pcm->period_size) * rate->gen.slave->period_size;
|
|
diff = slave_appl_ptr - *slave->appl.ptr;
|
|
if (diff < -(snd_pcm_sframes_t)(slave->boundary / 2)) {
|
|
diff = (slave->boundary - *slave->appl.ptr) + slave_appl_ptr;
|
|
} else if (diff > (snd_pcm_sframes_t)(slave->boundary / 2)) {
|
|
diff = -((slave->boundary - slave_appl_ptr) + *slave->appl.ptr);
|
|
}
|
|
if (diff == 0)
|
|
return frames;
|
|
if (diff > 0) {
|
|
ndiff = snd_pcm_forward(rate->gen.slave, diff);
|
|
} else {
|
|
ndiff = snd_pcm_rewind(rate->gen.slave, diff);
|
|
}
|
|
if (ndiff < 0)
|
|
return diff;
|
|
slave_appl_ptr = *slave->appl.ptr;
|
|
rate->appl_ptr =
|
|
(slave_appl_ptr / rate->gen.slave->period_size) * pcm->period_size +
|
|
snd_pcm_rate_client_frames(pcm, slave_appl_ptr % rate->gen.slave->period_size) +
|
|
orig_appl_ptr % pcm->period_size;
|
|
diff = orig_appl_ptr - rate->appl_ptr;
|
|
if (diff < -(snd_pcm_sframes_t)(slave->boundary / 2)) {
|
|
diff = (slave->boundary - rate->appl_ptr) + orig_appl_ptr;
|
|
} else if (diff > (snd_pcm_sframes_t)(slave->boundary / 2)) {
|
|
diff = -((slave->boundary - orig_appl_ptr) + rate->appl_ptr);
|
|
}
|
|
if (frames < 0)
|
|
diff = -diff;
|
|
|
|
rate->last_commit_ptr = rate->appl_ptr - rate->appl_ptr % pcm->period_size;
|
|
|
|
return diff;
|
|
}
|
|
|
|
static inline void snd_pcm_rate_sync_hwptr(snd_pcm_t *pcm)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_uframes_t slave_hw_ptr = *rate->gen.slave->hw.ptr;
|
|
|
|
if (pcm->stream != SND_PCM_STREAM_PLAYBACK)
|
|
return;
|
|
/* FIXME: boundary overlap of slave hw_ptr isn't evaluated here!
|
|
* e.g. if slave rate is small...
|
|
*/
|
|
rate->hw_ptr =
|
|
(slave_hw_ptr / rate->gen.slave->period_size) * pcm->period_size +
|
|
snd_pcm_rate_client_frames(pcm, slave_hw_ptr % rate->gen.slave->period_size);
|
|
}
|
|
|
|
static int snd_pcm_rate_hwsync(snd_pcm_t *pcm)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
int err = snd_pcm_hwsync(rate->gen.slave);
|
|
if (err < 0)
|
|
return err;
|
|
snd_atomic_write_begin(&rate->watom);
|
|
snd_pcm_rate_sync_hwptr(pcm);
|
|
snd_atomic_write_end(&rate->watom);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_pcm_rate_delay(snd_pcm_t *pcm, snd_pcm_sframes_t *delayp)
|
|
{
|
|
snd_pcm_rate_hwsync(pcm);
|
|
if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
|
|
*delayp = snd_pcm_mmap_playback_hw_avail(pcm);
|
|
else
|
|
*delayp = snd_pcm_mmap_capture_hw_avail(pcm);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_pcm_rate_prepare(snd_pcm_t *pcm)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
int err;
|
|
|
|
snd_atomic_write_begin(&rate->watom);
|
|
err = snd_pcm_prepare(rate->gen.slave);
|
|
if (err < 0) {
|
|
snd_atomic_write_end(&rate->watom);
|
|
return err;
|
|
}
|
|
*pcm->hw.ptr = 0;
|
|
*pcm->appl.ptr = 0;
|
|
snd_atomic_write_end(&rate->watom);
|
|
err = snd_pcm_rate_init(pcm);
|
|
if (err < 0)
|
|
return err;
|
|
return 0;
|
|
}
|
|
|
|
static int snd_pcm_rate_reset(snd_pcm_t *pcm)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
int err;
|
|
snd_atomic_write_begin(&rate->watom);
|
|
err = snd_pcm_reset(rate->gen.slave);
|
|
if (err < 0) {
|
|
snd_atomic_write_end(&rate->watom);
|
|
return err;
|
|
}
|
|
*pcm->hw.ptr = 0;
|
|
*pcm->appl.ptr = 0;
|
|
snd_atomic_write_end(&rate->watom);
|
|
err = snd_pcm_rate_init(pcm);
|
|
if (err < 0)
|
|
return err;
|
|
return 0;
|
|
}
|
|
|
|
static snd_pcm_sframes_t snd_pcm_rate_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_sframes_t n = snd_pcm_mmap_hw_avail(pcm);
|
|
|
|
if ((snd_pcm_uframes_t)n > frames)
|
|
frames = n;
|
|
if (frames == 0)
|
|
return 0;
|
|
|
|
snd_atomic_write_begin(&rate->watom);
|
|
n = snd_pcm_rate_move_applptr(pcm, -frames);
|
|
snd_atomic_write_end(&rate->watom);
|
|
return n;
|
|
}
|
|
|
|
static snd_pcm_sframes_t snd_pcm_rate_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_sframes_t n = snd_pcm_mmap_avail(pcm);
|
|
|
|
if ((snd_pcm_uframes_t)n > frames)
|
|
frames = n;
|
|
if (frames == 0)
|
|
return 0;
|
|
|
|
snd_atomic_write_begin(&rate->watom);
|
|
n = snd_pcm_rate_move_applptr(pcm, frames);
|
|
snd_atomic_write_end(&rate->watom);
|
|
return n;
|
|
}
|
|
|
|
static int snd_pcm_rate_poll_descriptors(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int space)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_uframes_t avail_min;
|
|
int ret, err;
|
|
|
|
ret = snd_pcm_generic_poll_descriptors(pcm, pfds, space);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
avail_min = rate->appl_ptr % pcm->period_size;
|
|
if (avail_min > 0) {
|
|
recalc(pcm, &avail_min);
|
|
if (avail_min < rate->gen.slave->buffer_size &&
|
|
avail_min != rate->gen.slave->period_size)
|
|
avail_min++; /* 1st small little rounding correction */
|
|
if (avail_min < rate->gen.slave->buffer_size &&
|
|
avail_min != rate->gen.slave->period_size)
|
|
avail_min++; /* 2nd small little rounding correction */
|
|
avail_min += rate->orig_avail_min;
|
|
} else {
|
|
avail_min = rate->orig_avail_min;
|
|
}
|
|
if (rate->sw_params.avail_min == avail_min)
|
|
return ret;
|
|
rate->sw_params.avail_min = avail_min;
|
|
err = snd_pcm_sw_params(rate->gen.slave, &rate->sw_params);
|
|
if (err < 0)
|
|
return err;
|
|
return ret;
|
|
}
|
|
|
|
static int snd_pcm_rate_commit_area(snd_pcm_t *pcm, snd_pcm_rate_t *rate,
|
|
snd_pcm_uframes_t appl_offset,
|
|
snd_pcm_uframes_t size,
|
|
snd_pcm_uframes_t slave_size)
|
|
{
|
|
snd_pcm_uframes_t cont = pcm->buffer_size - appl_offset;
|
|
const snd_pcm_channel_area_t *areas;
|
|
const snd_pcm_channel_area_t *slave_areas;
|
|
snd_pcm_uframes_t slave_offset, xfer;
|
|
snd_pcm_uframes_t slave_frames = ULONG_MAX;
|
|
snd_pcm_sframes_t result;
|
|
|
|
areas = snd_pcm_mmap_areas(pcm);
|
|
if (cont >= size) {
|
|
result = snd_pcm_mmap_begin(rate->gen.slave, &slave_areas, &slave_offset, &slave_frames);
|
|
if (result < 0)
|
|
return result;
|
|
if (slave_frames < slave_size) {
|
|
snd_pcm_rate_write_areas1(pcm, areas, appl_offset, rate->sareas, 0);
|
|
goto __partial;
|
|
}
|
|
snd_pcm_rate_write_areas1(pcm, areas, appl_offset,
|
|
slave_areas, slave_offset);
|
|
result = snd_pcm_mmap_commit(rate->gen.slave, slave_offset, slave_size);
|
|
if (result < (snd_pcm_sframes_t)slave_size) {
|
|
if (result < 0)
|
|
return result;
|
|
result = snd_pcm_rewind(rate->gen.slave, result);
|
|
if (result < 0)
|
|
return result;
|
|
return 0;
|
|
}
|
|
} else {
|
|
snd_pcm_areas_copy(rate->pareas, 0,
|
|
areas, appl_offset,
|
|
pcm->channels, cont,
|
|
pcm->format);
|
|
snd_pcm_areas_copy(rate->pareas, cont,
|
|
areas, 0,
|
|
pcm->channels, size - cont,
|
|
pcm->format);
|
|
|
|
snd_pcm_rate_write_areas1(pcm, rate->pareas, 0, rate->sareas, 0);
|
|
|
|
/* ok, commit first fragment */
|
|
result = snd_pcm_mmap_begin(rate->gen.slave, &slave_areas, &slave_offset, &slave_frames);
|
|
if (result < 0)
|
|
return result;
|
|
__partial:
|
|
xfer = 0;
|
|
cont = rate->gen.slave->buffer_size - slave_offset;
|
|
if (cont > slave_size)
|
|
cont = slave_size;
|
|
snd_pcm_areas_copy(slave_areas, slave_offset,
|
|
rate->sareas, 0,
|
|
pcm->channels, cont,
|
|
rate->gen.slave->format);
|
|
result = snd_pcm_mmap_commit(rate->gen.slave, slave_offset, cont);
|
|
if (result < (snd_pcm_sframes_t)cont) {
|
|
if (result < 0)
|
|
return result;
|
|
result = snd_pcm_rewind(rate->gen.slave, result);
|
|
if (result < 0)
|
|
return result;
|
|
return 0;
|
|
}
|
|
xfer = cont;
|
|
|
|
if (xfer == slave_size)
|
|
return 1;
|
|
|
|
/* commit second fragment */
|
|
cont = rate->gen.slave->period_size - cont;
|
|
slave_frames = cont;
|
|
result = snd_pcm_mmap_begin(rate->gen.slave, &slave_areas, &slave_offset, &slave_frames);
|
|
if (result < 0)
|
|
return result;
|
|
if (slave_offset) {
|
|
SNDERR("non-zero slave_offset %ld", slave_offset);
|
|
return -EIO;
|
|
}
|
|
snd_pcm_areas_copy(slave_areas, slave_offset,
|
|
rate->sareas, xfer,
|
|
pcm->channels, cont,
|
|
rate->gen.slave->format);
|
|
result = snd_pcm_mmap_commit(rate->gen.slave, slave_offset, cont);
|
|
if (result < (snd_pcm_sframes_t)cont) {
|
|
if (result < 0)
|
|
return result;
|
|
result = snd_pcm_rewind(rate->gen.slave, result + xfer);
|
|
if (result < 0)
|
|
return result;
|
|
return 0;
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int snd_pcm_rate_commit_next_period(snd_pcm_t *pcm, snd_pcm_uframes_t appl_offset)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
|
|
return snd_pcm_rate_commit_area(pcm, rate, appl_offset, pcm->period_size,
|
|
rate->gen.slave->period_size);
|
|
}
|
|
|
|
static int snd_pcm_rate_grab_next_period(snd_pcm_t *pcm, snd_pcm_uframes_t hw_offset)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_uframes_t cont = pcm->buffer_size - hw_offset;
|
|
const snd_pcm_channel_area_t *areas;
|
|
const snd_pcm_channel_area_t *slave_areas;
|
|
snd_pcm_uframes_t slave_offset, xfer;
|
|
snd_pcm_uframes_t slave_frames = ULONG_MAX;
|
|
snd_pcm_sframes_t result;
|
|
|
|
areas = snd_pcm_mmap_areas(pcm);
|
|
if (cont >= pcm->period_size) {
|
|
result = snd_pcm_mmap_begin(rate->gen.slave, &slave_areas, &slave_offset, &slave_frames);
|
|
if (result < 0)
|
|
return result;
|
|
if (slave_frames < rate->gen.slave->period_size)
|
|
goto __partial;
|
|
snd_pcm_rate_read_areas1(pcm, areas, hw_offset,
|
|
slave_areas, slave_offset);
|
|
result = snd_pcm_mmap_commit(rate->gen.slave, slave_offset, rate->gen.slave->period_size);
|
|
if (result < (snd_pcm_sframes_t)rate->gen.slave->period_size) {
|
|
if (result < 0)
|
|
return result;
|
|
result = snd_pcm_rewind(rate->gen.slave, result);
|
|
if (result < 0)
|
|
return result;
|
|
return 0;
|
|
}
|
|
} else {
|
|
/* ok, grab first fragment */
|
|
result = snd_pcm_mmap_begin(rate->gen.slave, &slave_areas, &slave_offset, &slave_frames);
|
|
if (result < 0)
|
|
return result;
|
|
__partial:
|
|
xfer = 0;
|
|
cont = rate->gen.slave->buffer_size - slave_offset;
|
|
if (cont > rate->gen.slave->period_size)
|
|
cont = rate->gen.slave->period_size;
|
|
snd_pcm_areas_copy(rate->sareas, 0,
|
|
slave_areas, slave_offset,
|
|
pcm->channels, cont,
|
|
rate->gen.slave->format);
|
|
result = snd_pcm_mmap_commit(rate->gen.slave, slave_offset, cont);
|
|
if (result < (snd_pcm_sframes_t)cont) {
|
|
if (result < 0)
|
|
return result;
|
|
result = snd_pcm_rewind(rate->gen.slave, result);
|
|
if (result < 0)
|
|
return result;
|
|
return 0;
|
|
}
|
|
xfer = cont;
|
|
|
|
if (xfer == rate->gen.slave->period_size)
|
|
goto __transfer;
|
|
|
|
/* grab second fragment */
|
|
cont = rate->gen.slave->period_size - cont;
|
|
slave_frames = cont;
|
|
result = snd_pcm_mmap_begin(rate->gen.slave, &slave_areas, &slave_offset, &slave_frames);
|
|
if (result < 0)
|
|
return result;
|
|
if (slave_offset) {
|
|
SNDERR("non-zero slave_offset %ld", slave_offset);
|
|
return -EIO;
|
|
}
|
|
snd_pcm_areas_copy(rate->sareas, xfer,
|
|
slave_areas, slave_offset,
|
|
pcm->channels, cont,
|
|
rate->gen.slave->format);
|
|
result = snd_pcm_mmap_commit(rate->gen.slave, slave_offset, cont);
|
|
if (result < (snd_pcm_sframes_t)cont) {
|
|
if (result < 0)
|
|
return result;
|
|
result = snd_pcm_rewind(rate->gen.slave, result + xfer);
|
|
if (result < 0)
|
|
return result;
|
|
return 0;
|
|
}
|
|
|
|
__transfer:
|
|
cont = pcm->buffer_size - hw_offset;
|
|
if (cont >= pcm->period_size) {
|
|
snd_pcm_rate_read_areas1(pcm, areas, hw_offset,
|
|
rate->sareas, 0);
|
|
} else {
|
|
snd_pcm_rate_read_areas1(pcm,
|
|
rate->pareas, 0,
|
|
rate->sareas, 0);
|
|
snd_pcm_areas_copy(areas, hw_offset,
|
|
rate->pareas, 0,
|
|
pcm->channels, cont,
|
|
pcm->format);
|
|
snd_pcm_areas_copy(areas, 0,
|
|
rate->pareas, cont,
|
|
pcm->channels, pcm->period_size - cont,
|
|
pcm->format);
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int snd_pcm_rate_sync_playback_area(snd_pcm_t *pcm, snd_pcm_uframes_t appl_ptr)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_t *slave = rate->gen.slave;
|
|
snd_pcm_uframes_t xfer;
|
|
snd_pcm_sframes_t slave_size;
|
|
int err;
|
|
|
|
slave_size = snd_pcm_avail_update(slave);
|
|
if (slave_size < 0)
|
|
return slave_size;
|
|
|
|
if (appl_ptr < rate->last_commit_ptr)
|
|
xfer = appl_ptr - rate->last_commit_ptr + pcm->boundary;
|
|
else
|
|
xfer = appl_ptr - rate->last_commit_ptr;
|
|
while (xfer >= pcm->period_size &&
|
|
(snd_pcm_uframes_t)slave_size >= rate->gen.slave->period_size) {
|
|
err = snd_pcm_rate_commit_next_period(pcm, rate->last_commit_ptr % pcm->buffer_size);
|
|
if (err == 0)
|
|
break;
|
|
if (err < 0)
|
|
return err;
|
|
xfer -= pcm->period_size;
|
|
slave_size -= rate->gen.slave->period_size;
|
|
rate->last_commit_ptr += pcm->period_size;
|
|
if (rate->last_commit_ptr >= pcm->boundary)
|
|
rate->last_commit_ptr = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static snd_pcm_sframes_t snd_pcm_rate_mmap_commit(snd_pcm_t *pcm,
|
|
snd_pcm_uframes_t offset ATTRIBUTE_UNUSED,
|
|
snd_pcm_uframes_t size)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
int err;
|
|
|
|
if (size == 0)
|
|
return 0;
|
|
if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
err = snd_pcm_rate_sync_playback_area(pcm, rate->appl_ptr + size);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
snd_atomic_write_begin(&rate->watom);
|
|
snd_pcm_mmap_appl_forward(pcm, size);
|
|
snd_atomic_write_end(&rate->watom);
|
|
return size;
|
|
}
|
|
|
|
static snd_pcm_sframes_t snd_pcm_rate_avail_update(snd_pcm_t *pcm)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_t *slave = rate->gen.slave;
|
|
snd_pcm_uframes_t slave_size;
|
|
|
|
slave_size = snd_pcm_avail_update(slave);
|
|
if (pcm->stream == SND_PCM_STREAM_CAPTURE)
|
|
goto _capture;
|
|
snd_atomic_write_begin(&rate->watom);
|
|
snd_pcm_rate_sync_hwptr(pcm);
|
|
snd_atomic_write_end(&rate->watom);
|
|
snd_pcm_rate_sync_playback_area(pcm, rate->appl_ptr);
|
|
return snd_pcm_mmap_avail(pcm);
|
|
_capture: {
|
|
snd_pcm_uframes_t xfer, hw_offset, size;
|
|
|
|
xfer = snd_pcm_mmap_capture_avail(pcm);
|
|
size = pcm->buffer_size - xfer;
|
|
hw_offset = snd_pcm_mmap_hw_offset(pcm);
|
|
while (size >= pcm->period_size &&
|
|
slave_size >= rate->gen.slave->period_size) {
|
|
int err = snd_pcm_rate_grab_next_period(pcm, hw_offset);
|
|
if (err < 0)
|
|
return err;
|
|
if (err == 0)
|
|
return (snd_pcm_sframes_t)xfer;
|
|
xfer += pcm->period_size;
|
|
size -= pcm->period_size;
|
|
slave_size -= rate->gen.slave->period_size;
|
|
hw_offset += pcm->period_size;
|
|
hw_offset %= pcm->buffer_size;
|
|
snd_pcm_mmap_hw_forward(pcm, pcm->period_size);
|
|
}
|
|
return (snd_pcm_sframes_t)xfer;
|
|
}
|
|
}
|
|
|
|
static int snd_pcm_rate_poll_revents(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
/* Try to sync as much as possible */
|
|
snd_pcm_rate_hwsync(pcm);
|
|
snd_pcm_rate_sync_playback_area(pcm, rate->appl_ptr);
|
|
}
|
|
return snd_pcm_poll_descriptors_revents(rate->gen.slave, pfds, nfds, revents);
|
|
}
|
|
|
|
static int snd_pcm_rate_drain(snd_pcm_t *pcm)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
|
|
if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
/* commit the remaining fraction (if any) */
|
|
snd_pcm_uframes_t size, slave_size;
|
|
size = rate->appl_ptr - rate->last_commit_ptr;
|
|
if (size > 0) {
|
|
slave_size = snd_pcm_rate_slave_frames(pcm, size);
|
|
if (slave_size > 0)
|
|
snd_pcm_rate_commit_area(pcm, rate, rate->last_commit_ptr % pcm->buffer_size,
|
|
size, slave_size);
|
|
}
|
|
}
|
|
return snd_pcm_drain(rate->gen.slave);
|
|
}
|
|
|
|
static int snd_pcm_rate_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
snd_pcm_sframes_t err;
|
|
snd_atomic_read_t ratom;
|
|
snd_atomic_read_init(&ratom, &rate->watom);
|
|
_again:
|
|
snd_atomic_read_begin(&ratom);
|
|
err = snd_pcm_status(rate->gen.slave, status);
|
|
if (err < 0) {
|
|
snd_atomic_read_ok(&ratom);
|
|
return err;
|
|
}
|
|
snd_pcm_rate_sync_hwptr(pcm);
|
|
status->appl_ptr = *pcm->appl.ptr;
|
|
status->hw_ptr = *pcm->hw.ptr;
|
|
if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
|
|
status->delay = snd_pcm_mmap_playback_hw_avail(pcm);
|
|
status->avail = snd_pcm_mmap_playback_avail(pcm);
|
|
} else {
|
|
status->delay = snd_pcm_mmap_capture_hw_avail(pcm);
|
|
status->avail = snd_pcm_mmap_capture_avail(pcm);
|
|
}
|
|
if (!snd_atomic_read_ok(&ratom)) {
|
|
snd_atomic_read_wait(&ratom);
|
|
goto _again;
|
|
}
|
|
status->avail_max = snd_pcm_rate_client_frames(pcm, (snd_pcm_sframes_t) status->avail_max);
|
|
return 0;
|
|
}
|
|
|
|
static void snd_pcm_rate_dump(snd_pcm_t *pcm, snd_output_t *out)
|
|
{
|
|
snd_pcm_rate_t *rate = pcm->private_data;
|
|
if (rate->sformat == SND_PCM_FORMAT_UNKNOWN)
|
|
snd_output_printf(out, "Rate conversion PCM (%d)\n",
|
|
rate->srate);
|
|
else
|
|
snd_output_printf(out, "Rate conversion PCM (%d, sformat=%s)\n",
|
|
rate->srate,
|
|
snd_pcm_format_name(rate->sformat));
|
|
if (pcm->setup) {
|
|
snd_output_printf(out, "Its setup is:\n");
|
|
snd_pcm_dump_setup(pcm, out);
|
|
}
|
|
snd_output_printf(out, "Slave: ");
|
|
snd_pcm_dump(rate->gen.slave, out);
|
|
}
|
|
|
|
static snd_pcm_fast_ops_t snd_pcm_rate_fast_ops = {
|
|
.status = snd_pcm_rate_status,
|
|
.state = snd_pcm_generic_state,
|
|
.hwsync = snd_pcm_rate_hwsync,
|
|
.delay = snd_pcm_rate_delay,
|
|
.prepare = snd_pcm_rate_prepare,
|
|
.reset = snd_pcm_rate_reset,
|
|
.start = snd_pcm_generic_start,
|
|
.drop = snd_pcm_generic_drop,
|
|
.drain = snd_pcm_rate_drain,
|
|
.pause = snd_pcm_generic_pause,
|
|
.rewind = snd_pcm_rate_rewind,
|
|
.forward = snd_pcm_rate_forward,
|
|
.resume = snd_pcm_generic_resume,
|
|
.writei = snd_pcm_mmap_writei,
|
|
.writen = snd_pcm_mmap_writen,
|
|
.readi = snd_pcm_mmap_readi,
|
|
.readn = snd_pcm_mmap_readn,
|
|
.avail_update = snd_pcm_rate_avail_update,
|
|
.mmap_commit = snd_pcm_rate_mmap_commit,
|
|
.poll_descriptors_count = snd_pcm_generic_poll_descriptors_count,
|
|
.poll_descriptors = snd_pcm_rate_poll_descriptors,
|
|
.poll_revents = snd_pcm_rate_poll_revents,
|
|
};
|
|
|
|
static snd_pcm_ops_t snd_pcm_rate_ops = {
|
|
.close = snd_pcm_generic_close,
|
|
.info = snd_pcm_generic_info,
|
|
.hw_refine = snd_pcm_rate_hw_refine,
|
|
.hw_params = snd_pcm_rate_hw_params,
|
|
.hw_free = snd_pcm_rate_hw_free,
|
|
.sw_params = snd_pcm_rate_sw_params,
|
|
.channel_info = snd_pcm_generic_channel_info,
|
|
.dump = snd_pcm_rate_dump,
|
|
.nonblock = snd_pcm_generic_nonblock,
|
|
.async = snd_pcm_generic_async,
|
|
.mmap = snd_pcm_generic_mmap,
|
|
.munmap = snd_pcm_generic_munmap,
|
|
};
|
|
|
|
|
|
/**
|
|
* \brief Creates a new rate PCM
|
|
* \param pcmp Returns created PCM handle
|
|
* \param name Name of PCM
|
|
* \param sformat Slave format
|
|
* \param srate Slave rate
|
|
* \param slave Slave PCM handle
|
|
* \param close_slave When set, the slave PCM handle is closed with copy PCM
|
|
* \retval zero on success otherwise a negative error code
|
|
* \warning Using of this function might be dangerous in the sense
|
|
* of compatibility reasons. The prototype might be freely
|
|
* changed in future.
|
|
*/
|
|
int snd_pcm_rate_open(snd_pcm_t **pcmp, const char *name, snd_pcm_format_t sformat, unsigned int srate, snd_pcm_t *slave, int close_slave)
|
|
{
|
|
snd_pcm_t *pcm;
|
|
snd_pcm_rate_t *rate;
|
|
int err;
|
|
assert(pcmp && slave);
|
|
if (sformat != SND_PCM_FORMAT_UNKNOWN &&
|
|
snd_pcm_format_linear(sformat) != 1)
|
|
return -EINVAL;
|
|
rate = calloc(1, sizeof(snd_pcm_rate_t));
|
|
if (!rate) {
|
|
return -ENOMEM;
|
|
}
|
|
rate->gen.slave = slave;
|
|
rate->gen.close_slave = close_slave;
|
|
rate->type = RATE_TYPE_LINEAR;
|
|
rate->srate = srate;
|
|
rate->sformat = sformat;
|
|
snd_atomic_write_init(&rate->watom);
|
|
|
|
err = snd_pcm_new(&pcm, SND_PCM_TYPE_RATE, name, slave->stream, slave->mode);
|
|
if (err < 0) {
|
|
free(rate);
|
|
return err;
|
|
}
|
|
pcm->ops = &snd_pcm_rate_ops;
|
|
pcm->fast_ops = &snd_pcm_rate_fast_ops;
|
|
pcm->private_data = rate;
|
|
pcm->poll_fd = slave->poll_fd;
|
|
pcm->poll_events = slave->poll_events;
|
|
pcm->mmap_rw = 1;
|
|
snd_pcm_set_hw_ptr(pcm, &rate->hw_ptr, -1, 0);
|
|
snd_pcm_set_appl_ptr(pcm, &rate->appl_ptr, -1, 0);
|
|
*pcmp = pcm;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*! \page pcm_plugins
|
|
|
|
\section pcm_plugins_rate Plugin: Rate
|
|
|
|
This plugin converts a stream rate. The input and output formats must be linear.
|
|
|
|
\code
|
|
pcm.name {
|
|
type rate # Rate PCM
|
|
slave STR # Slave name
|
|
# or
|
|
slave { # Slave definition
|
|
pcm STR # Slave PCM name
|
|
# or
|
|
pcm { } # Slave PCM definition
|
|
rate INT # Slave rate
|
|
[format STR] # Slave format
|
|
}
|
|
}
|
|
\endcode
|
|
|
|
\subsection pcm_plugins_rate_funcref Function reference
|
|
|
|
<UL>
|
|
<LI>snd_pcm_rate_open()
|
|
<LI>_snd_pcm_rate_open()
|
|
</UL>
|
|
|
|
*/
|
|
|
|
/**
|
|
* \brief Creates a new rate PCM
|
|
* \param pcmp Returns created PCM handle
|
|
* \param name Name of PCM
|
|
* \param root Root configuration node
|
|
* \param conf Configuration node with rate PCM description
|
|
* \param stream Stream type
|
|
* \param mode Stream mode
|
|
* \retval zero on success otherwise a negative error code
|
|
* \warning Using of this function might be dangerous in the sense
|
|
* of compatibility reasons. The prototype might be freely
|
|
* changed in future.
|
|
*/
|
|
int _snd_pcm_rate_open(snd_pcm_t **pcmp, const char *name,
|
|
snd_config_t *root, snd_config_t *conf,
|
|
snd_pcm_stream_t stream, int mode)
|
|
{
|
|
snd_config_iterator_t i, next;
|
|
int err;
|
|
snd_pcm_t *spcm;
|
|
snd_config_t *slave = NULL, *sconf;
|
|
snd_pcm_format_t sformat = SND_PCM_FORMAT_UNKNOWN;
|
|
int srate = -1;
|
|
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 (snd_pcm_conf_generic_id(id))
|
|
continue;
|
|
if (strcmp(id, "slave") == 0) {
|
|
slave = n;
|
|
continue;
|
|
}
|
|
SNDERR("Unknown field %s", id);
|
|
return -EINVAL;
|
|
}
|
|
if (!slave) {
|
|
SNDERR("slave is not defined");
|
|
return -EINVAL;
|
|
}
|
|
err = snd_pcm_slave_conf(root, slave, &sconf, 2,
|
|
SND_PCM_HW_PARAM_FORMAT, 0, &sformat,
|
|
SND_PCM_HW_PARAM_RATE, SCONF_MANDATORY, &srate);
|
|
if (err < 0)
|
|
return err;
|
|
if (sformat != SND_PCM_FORMAT_UNKNOWN &&
|
|
snd_pcm_format_linear(sformat) != 1) {
|
|
snd_config_delete(sconf);
|
|
SNDERR("slave format is not linear");
|
|
return -EINVAL;
|
|
}
|
|
err = snd_pcm_open_slave(&spcm, root, sconf, stream, mode);
|
|
snd_config_delete(sconf);
|
|
if (err < 0)
|
|
return err;
|
|
err = snd_pcm_rate_open(pcmp, name,
|
|
sformat, (unsigned int) srate, spcm, 1);
|
|
if (err < 0)
|
|
snd_pcm_close(spcm);
|
|
return err;
|
|
}
|
|
#ifndef DOC_HIDDEN
|
|
SND_DLSYM_BUILD_VERSION(_snd_pcm_rate_open, SND_PCM_DLSYM_VERSION);
|
|
#endif
|