/* * Copyright (C) 2003-2009 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #include "pcm_resample_internal.h" #include "conf.h" #include "config.h" #include <glib.h> #include <assert.h> #include <stdlib.h> #include <string.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "pcm" void pcm_resample_lsr_deinit(struct pcm_resample_state *state) { if (state->state != NULL) state->state = src_delete(state->state); pcm_buffer_deinit(&state->in); pcm_buffer_deinit(&state->out); pcm_buffer_deinit(&state->buffer); } static int pcm_resample_get_converter(void) { const char *conf = config_get_string(CONF_SAMPLERATE_CONVERTER, NULL); long convalgo; char *test; const char *test2; size_t len; if (!conf) { convalgo = SRC_SINC_FASTEST; goto out; } convalgo = strtol(conf, &test, 10); if (*test == '\0' && src_get_name(convalgo)) goto out; len = strlen(conf); for (convalgo = 0 ; ; convalgo++) { test2 = src_get_name(convalgo); if (!test2) { convalgo = SRC_SINC_FASTEST; break; } if (strncasecmp(test2, conf, len) == 0) goto out; } g_warning("unknown samplerate converter \"%s\"", conf); out: g_debug("selecting samplerate converter \"%s\"", src_get_name(convalgo)); return convalgo; } static void pcm_resample_set(struct pcm_resample_state *state, uint8_t channels, unsigned src_rate, unsigned dest_rate) { static int convalgo = -1; int error; SRC_DATA *data = &state->data; if (convalgo < 0) convalgo = pcm_resample_get_converter(); /* (re)set the state/ratio if the in or out format changed */ if (channels == state->prev.channels && src_rate == state->prev.src_rate && dest_rate == state->prev.dest_rate) return; state->error = false; state->prev.channels = channels; state->prev.src_rate = src_rate; state->prev.dest_rate = dest_rate; if (state->state) state->state = src_delete(state->state); state->state = src_new(convalgo, channels, &error); if (!state->state) { g_warning("cannot create new libsamplerate state: %s", src_strerror(error)); state->error = true; return; } data->src_ratio = (double)dest_rate / (double)src_rate; g_debug("setting samplerate conversion ratio to %.2lf", data->src_ratio); src_set_ratio(state->state, data->src_ratio); } const int16_t * pcm_resample_lsr_16(struct pcm_resample_state *state, uint8_t channels, unsigned src_rate, const int16_t *src_buffer, size_t src_size, unsigned dest_rate, size_t *dest_size_r) { SRC_DATA *data = &state->data; size_t data_in_size; size_t data_out_size; int error; int16_t *dest_buffer; assert((src_size % (sizeof(*src_buffer) * channels)) == 0); pcm_resample_set(state, channels, src_rate, dest_rate); /* there was an error previously, and nothing has changed */ if (state->error) return NULL; data->input_frames = src_size / sizeof(*src_buffer) / channels; data_in_size = data->input_frames * sizeof(float) * channels; data->data_in = pcm_buffer_get(&state->in, data_in_size); data->output_frames = (src_size * dest_rate + src_rate - 1) / src_rate; data_out_size = data->output_frames * sizeof(float) * channels; data->data_out = pcm_buffer_get(&state->out, data_out_size); src_short_to_float_array(src_buffer, data->data_in, data->input_frames * channels); error = src_process(state->state, data); if (error) { g_warning("error processing samples with libsamplerate: %s", src_strerror(error)); state->error = true; return NULL; } *dest_size_r = data->output_frames_gen * sizeof(*dest_buffer) * channels; dest_buffer = pcm_buffer_get(&state->buffer, *dest_size_r); src_float_to_short_array(data->data_out, dest_buffer, data->output_frames_gen * channels); return dest_buffer; } #ifdef HAVE_LIBSAMPLERATE_NOINT /* libsamplerate introduced these functions in v0.1.3 */ static void src_int_to_float_array(const int *in, float *out, int len) { while (len-- > 0) *out++ = *in++ / (float)(1 << (24 - 1)); } static void src_float_to_int_array (const float *in, int *out, int len) { while (len-- > 0) *out++ = *in++ * (float)(1 << (24 - 1)); } #endif const int32_t * pcm_resample_lsr_32(struct pcm_resample_state *state, uint8_t channels, unsigned src_rate, const int32_t *src_buffer, size_t src_size, unsigned dest_rate, size_t *dest_size_r) { SRC_DATA *data = &state->data; size_t data_in_size; size_t data_out_size; int error; int32_t *dest_buffer; assert((src_size % (sizeof(*src_buffer) * channels)) == 0); pcm_resample_set(state, channels, src_rate, dest_rate); /* there was an error previously, and nothing has changed */ if (state->error) return NULL; data->input_frames = src_size / sizeof(*src_buffer) / channels; data_in_size = data->input_frames * sizeof(float) * channels; data->data_in = pcm_buffer_get(&state->in, data_in_size); data->output_frames = (src_size * dest_rate + src_rate - 1) / src_rate; data_out_size = data->output_frames * sizeof(float) * channels; data->data_out = pcm_buffer_get(&state->out, data_out_size); src_int_to_float_array(src_buffer, data->data_in, data->input_frames * channels); error = src_process(state->state, data); if (error) { g_warning("error processing samples with libsamplerate: %s", src_strerror(error)); state->error = true; return NULL; } *dest_size_r = data->output_frames_gen * sizeof(*dest_buffer) * channels; dest_buffer = pcm_buffer_get(&state->buffer, *dest_size_r); src_float_to_int_array(data->data_out, dest_buffer, data->output_frames_gen * channels); return dest_buffer; }