/* * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "pcm_format.h" #include "pcm_dither.h" #include "pcm_buffer.h" #include <glib.h> static void pcm_convert_8_to_16(int16_t *out, const int8_t *in, unsigned num_samples) { while (num_samples > 0) { *out++ = *in++ << 8; --num_samples; } } static void pcm_convert_24_to_16(struct pcm_dither_24 *dither, int16_t *out, const int32_t *in, unsigned num_samples) { pcm_dither_24_to_16(dither, out, in, num_samples); } const int16_t * pcm_convert_to_16(struct pcm_buffer *buffer, struct pcm_dither_24 *dither, uint8_t bits, const void *src, size_t src_size, size_t *dest_size_r) { unsigned num_samples; int16_t *dest; switch (bits) { case 8: num_samples = src_size; *dest_size_r = src_size * sizeof(*dest); dest = pcm_buffer_get(buffer, *dest_size_r); pcm_convert_8_to_16(dest, (const int8_t *)src, num_samples); return dest; case 16: *dest_size_r = src_size; return src; case 24: num_samples = src_size / 4; *dest_size_r = num_samples * sizeof(*dest); dest = pcm_buffer_get(buffer, *dest_size_r); pcm_convert_24_to_16(dither, dest, (const int32_t *)src, num_samples); return dest; } g_warning("only 8 or 16 bits are supported for conversion!\n"); return NULL; } static void pcm_convert_8_to_24(int32_t *out, const int8_t *in, unsigned num_samples) { while (num_samples > 0) { *out++ = *in++ << 16; --num_samples; } } static void pcm_convert_16_to_24(int32_t *out, const int16_t *in, unsigned num_samples) { while (num_samples > 0) { *out++ = *in++ << 8; --num_samples; } } const int32_t * pcm_convert_to_24(struct pcm_buffer *buffer, uint8_t bits, const void *src, size_t src_size, size_t *dest_size_r) { unsigned num_samples; int32_t *dest; switch (bits) { case 8: num_samples = src_size; *dest_size_r = src_size * sizeof(*dest); dest = pcm_buffer_get(buffer, *dest_size_r); pcm_convert_8_to_24(dest, (const int8_t *)src, num_samples); return dest; case 16: num_samples = src_size / 2; *dest_size_r = num_samples * sizeof(*dest); dest = pcm_buffer_get(buffer, *dest_size_r); pcm_convert_16_to_24(dest, (const int16_t *)src, num_samples); return dest; case 24: *dest_size_r = src_size; return src; } g_warning("only 8 or 24 bits are supported for conversion!\n"); return NULL; }