fd81e7e3b6
strncasecmp() is locale dependent, making it a bad choice for internal string comparisons.
238 lines
6.2 KiB
C
238 lines
6.2 KiB
C
/*
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* Copyright (C) 2003-2009 The Music Player Daemon Project
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* 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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "pcm_resample_internal.h"
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#include "conf.h"
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#include "config.h"
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#include <glib.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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#undef G_LOG_DOMAIN
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#define G_LOG_DOMAIN "pcm"
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void
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pcm_resample_lsr_deinit(struct pcm_resample_state *state)
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{
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if (state->state != NULL)
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state->state = src_delete(state->state);
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pcm_buffer_deinit(&state->in);
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pcm_buffer_deinit(&state->out);
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pcm_buffer_deinit(&state->buffer);
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}
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static int pcm_resample_get_converter(void)
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{
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const char *conf = config_get_string(CONF_SAMPLERATE_CONVERTER, NULL);
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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 (g_ascii_strncasecmp(test2, conf, len) == 0)
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goto out;
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}
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g_warning("unknown samplerate converter \"%s\"", conf);
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out:
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g_debug("selecting samplerate converter \"%s\"",
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src_get_name(convalgo));
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return convalgo;
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}
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static void
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pcm_resample_set(struct pcm_resample_state *state,
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uint8_t channels, unsigned src_rate, unsigned dest_rate)
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{
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static int convalgo = -1;
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int error;
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SRC_DATA *data = &state->data;
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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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return;
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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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g_warning("cannot create new libsamplerate state: %s",
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src_strerror(error));
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state->error = true;
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return;
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}
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data->src_ratio = (double)dest_rate / (double)src_rate;
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g_debug("setting samplerate conversion ratio to %.2lf",
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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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const int16_t *
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pcm_resample_lsr_16(struct pcm_resample_state *state,
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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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size_t *dest_size_r)
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{
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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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int16_t *dest_buffer;
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assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
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pcm_resample_set(state, channels, src_rate, dest_rate);
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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 NULL;
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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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data->data_in = pcm_buffer_get(&state->in, data_in_size);
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data->output_frames = (src_size * dest_rate + src_rate - 1) / src_rate;
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data_out_size = data->output_frames * sizeof(float) * channels;
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data->data_out = pcm_buffer_get(&state->out, data_out_size);
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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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g_warning("error processing samples with libsamplerate: %s",
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src_strerror(error));
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state->error = true;
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return NULL;
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}
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*dest_size_r = data->output_frames_gen *
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sizeof(*dest_buffer) * channels;
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dest_buffer = pcm_buffer_get(&state->buffer, *dest_size_r);
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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 dest_buffer;
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}
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#ifdef HAVE_LIBSAMPLERATE_NOINT
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/* libsamplerate introduced these functions in v0.1.3 */
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static void
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src_int_to_float_array(const int *in, float *out, int len)
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{
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while (len-- > 0)
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*out++ = *in++ / (float)(1 << (24 - 1));
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}
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static void
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src_float_to_int_array (const float *in, int *out, int len)
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{
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while (len-- > 0)
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*out++ = *in++ * (float)(1 << (24 - 1));
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}
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#endif
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const int32_t *
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pcm_resample_lsr_32(struct pcm_resample_state *state,
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uint8_t channels,
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unsigned src_rate,
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const int32_t *src_buffer, size_t src_size,
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unsigned dest_rate,
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size_t *dest_size_r)
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{
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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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int32_t *dest_buffer;
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assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
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pcm_resample_set(state, channels, src_rate, dest_rate);
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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 NULL;
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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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data->data_in = pcm_buffer_get(&state->in, data_in_size);
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data->output_frames = (src_size * dest_rate + src_rate - 1) / src_rate;
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data_out_size = data->output_frames * sizeof(float) * channels;
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data->data_out = pcm_buffer_get(&state->out, data_out_size);
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src_int_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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g_warning("error processing samples with libsamplerate: %s",
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src_strerror(error));
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state->error = true;
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return NULL;
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}
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*dest_size_r = data->output_frames_gen *
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sizeof(*dest_buffer) * channels;
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dest_buffer = pcm_buffer_get(&state->buffer, *dest_size_r);
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src_float_to_int_array(data->data_out, dest_buffer,
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data->output_frames_gen * channels);
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return dest_buffer;
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}
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