/* * 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_convert.h" #include "pcm_channels.h" #include "pcm_format.h" #include "audio_format.h" #include <assert.h> #include <string.h> #include <math.h> #include <glib.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "pcm" void pcm_convert_init(struct pcm_convert_state *state) { memset(state, 0, sizeof(*state)); pcm_resample_init(&state->resample); pcm_dither_24_init(&state->dither); pcm_buffer_init(&state->format_buffer); pcm_buffer_init(&state->channels_buffer); } void pcm_convert_deinit(struct pcm_convert_state *state) { pcm_resample_deinit(&state->resample); pcm_buffer_deinit(&state->format_buffer); pcm_buffer_deinit(&state->channels_buffer); } static const int16_t * pcm_convert_16(struct pcm_convert_state *state, const struct audio_format *src_format, const void *src_buffer, size_t src_size, const struct audio_format *dest_format, size_t *dest_size_r) { const int16_t *buf; size_t len; assert(dest_format->bits == 16); buf = pcm_convert_to_16(&state->format_buffer, &state->dither, src_format->bits, src_buffer, src_size, &len); if (!buf) g_error("pcm_convert_to_16() failed"); if (src_format->channels != dest_format->channels) { buf = pcm_convert_channels_16(&state->channels_buffer, dest_format->channels, src_format->channels, buf, len, &len); if (!buf) g_error("pcm_convert_channels_16() failed"); } if (src_format->sample_rate != dest_format->sample_rate) buf = pcm_resample_16(&state->resample, dest_format->channels, src_format->sample_rate, buf, len, dest_format->sample_rate, &len); *dest_size_r = len; return buf; } static const int32_t * pcm_convert_24(struct pcm_convert_state *state, const struct audio_format *src_format, const void *src_buffer, size_t src_size, const struct audio_format *dest_format, size_t *dest_size_r) { const int32_t *buf; size_t len; assert(dest_format->bits == 24); buf = pcm_convert_to_24(&state->format_buffer, src_format->bits, src_buffer, src_size, &len); if (!buf) g_error("pcm_convert_to_24() failed"); if (src_format->channels != dest_format->channels) { buf = pcm_convert_channels_24(&state->channels_buffer, dest_format->channels, src_format->channels, buf, len, &len); if (!buf) g_error("pcm_convert_channels_24() failed"); } if (src_format->sample_rate != dest_format->sample_rate) buf = pcm_resample_24(&state->resample, dest_format->channels, src_format->sample_rate, buf, len, dest_format->sample_rate, &len); *dest_size_r = len; return buf; } static const int32_t * pcm_convert_32(struct pcm_convert_state *state, const struct audio_format *src_format, const void *src_buffer, size_t src_size, const struct audio_format *dest_format, size_t *dest_size_r) { const int32_t *buf; size_t len; assert(dest_format->bits == 32); buf = pcm_convert_to_32(&state->format_buffer, src_format->bits, src_buffer, src_size, &len); if (!buf) g_error("pcm_convert_to_32() failed"); if (src_format->channels != dest_format->channels) { buf = pcm_convert_channels_32(&state->channels_buffer, dest_format->channels, src_format->channels, buf, len, &len); if (!buf) g_error("pcm_convert_channels_32() failed"); } if (src_format->sample_rate != dest_format->sample_rate) buf = pcm_resample_32(&state->resample, dest_format->channels, src_format->sample_rate, buf, len, dest_format->sample_rate, &len); *dest_size_r = len; return buf; } const void * pcm_convert(struct pcm_convert_state *state, const struct audio_format *src_format, const void *src, size_t src_size, const struct audio_format *dest_format, size_t *dest_size_r) { switch (dest_format->bits) { case 16: return pcm_convert_16(state, src_format, src, src_size, dest_format, dest_size_r); case 24: return pcm_convert_24(state, src_format, src, src_size, dest_format, dest_size_r); case 32: return pcm_convert_32(state, src_format, src, src_size, dest_format, dest_size_r); default: g_error("cannot convert to %u bit\n", dest_format->bits); return NULL; } }