145 lines
4.1 KiB
C
145 lines
4.1 KiB
C
/* the Music Player Daemon (MPD)
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* Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
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* Copyright (C) 2008 Max Kellermann <max@duempel.org>
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* This project's homepage is: http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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#include "pcm_resample.h"
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#include "conf.h"
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#include "log.h"
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#include "utils.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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static int pcm_resample_get_converter(void)
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{
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const char *conf = getConfigParamValue(CONF_SAMPLERATE_CONVERTER);
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long convalgo;
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char *test;
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const char *test2;
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size_t len;
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if (!conf) {
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convalgo = SRC_SINC_FASTEST;
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goto out;
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}
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convalgo = strtol(conf, &test, 10);
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if (*test == '\0' && src_get_name(convalgo))
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goto out;
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len = strlen(conf);
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for (convalgo = 0 ; ; convalgo++) {
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test2 = src_get_name(convalgo);
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if (!test2) {
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convalgo = SRC_SINC_FASTEST;
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break;
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}
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if (strncasecmp(test2, conf, len) == 0)
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goto out;
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}
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ERROR("unknown samplerate converter \"%s\"\n", conf);
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out:
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DEBUG("selecting samplerate converter \"%s\"\n",
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src_get_name(convalgo));
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return convalgo;
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}
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size_t
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pcm_resample_16(uint8_t channels,
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unsigned src_rate,
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const int16_t *src_buffer, size_t src_size,
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unsigned dest_rate,
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int16_t *dest_buffer, size_t dest_size,
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struct pcm_resample_state *state)
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{
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static int convalgo = -1;
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SRC_DATA *data = &state->data;
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size_t data_in_size;
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size_t data_out_size;
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int error;
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assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
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assert((dest_size % (sizeof(*dest_buffer) * channels)) == 0);
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if (convalgo < 0)
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convalgo = pcm_resample_get_converter();
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/* (re)set the state/ratio if the in or out format changed */
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if (channels != state->prev.channels ||
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src_rate != state->prev.src_rate ||
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dest_rate != state->prev.dest_rate) {
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state->error = false;
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state->prev.channels = channels;
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state->prev.src_rate = src_rate;
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state->prev.dest_rate = dest_rate;
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if (state->state)
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state->state = src_delete(state->state);
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state->state = src_new(convalgo, channels, &error);
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if (!state->state) {
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ERROR("cannot create new libsamplerate state: %s\n",
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src_strerror(error));
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state->error = true;
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return 0;
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}
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data->src_ratio = (double)dest_rate / (double)src_rate;
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DEBUG("setting samplerate conversion ratio to %.2lf\n",
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data->src_ratio);
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src_set_ratio(state->state, data->src_ratio);
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}
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/* there was an error previously, and nothing has changed */
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if (state->error)
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return 0;
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data->input_frames = src_size / sizeof(*src_buffer) / channels;
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data_in_size = data->input_frames * sizeof(float) * channels;
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if (data_in_size > state->data_in_size) {
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state->data_in_size = data_in_size;
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data->data_in = xrealloc(data->data_in, data_in_size);
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}
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data->output_frames = dest_size / sizeof(*dest_buffer) / channels;
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data_out_size = data->output_frames * sizeof(float) * channels;
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if (data_out_size > state->data_out_size) {
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state->data_out_size = data_out_size;
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data->data_out = xrealloc(data->data_out, data_out_size);
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}
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src_short_to_float_array(src_buffer, data->data_in,
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data->input_frames * channels);
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error = src_process(state->state, data);
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if (error) {
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ERROR("error processing samples with libsamplerate: %s\n",
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src_strerror(error));
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state->error = true;
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return 0;
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}
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src_float_to_short_array(data->data_out, dest_buffer,
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data->output_frames_gen * channels);
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return data->output_frames_gen * sizeof(*dest_buffer) * channels;
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}
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