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Diffstat (limited to '')
| -rw-r--r-- | src/pcm_resample_fallback.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/pcm_resample_fallback.c b/src/pcm_resample_fallback.c new file mode 100644 index 000000000..4ab586160 --- /dev/null +++ b/src/pcm_resample_fallback.c @@ -0,0 +1,61 @@ +/* the Music Player Daemon (MPD) + * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com) + * Copyright (C) 2008 Max Kellermann <max@duempel.org> + * This project's homepage is: 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_resample.h" +#include "gcc.h" + +/* resampling code blatantly ripped from ESD */ +size_t +pcm_resample_16(uint8_t channels, + unsigned src_rate, + const int16_t *src_buffer, mpd_unused size_t src_size, + unsigned dest_rate, + int16_t *dest_buffer, size_t dest_size, + mpd_unused struct pcm_resample_state *state) +{ + unsigned src_pos, dest_pos = 0; + unsigned dest_samples = dest_size / 2; + int16_t lsample, rsample; + + switch (channels) { + case 1: + while (dest_pos < dest_samples) { + src_pos = dest_pos * src_rate / dest_rate; + + lsample = src_buffer[src_pos++]; + + dest_buffer[dest_pos++] = lsample; + } + break; + case 2: + while (dest_pos < dest_samples) { + src_pos = dest_pos * src_rate / dest_rate; + src_pos &= ~1; + + lsample = src_buffer[src_pos++]; + rsample = src_buffer[src_pos++]; + + dest_buffer[dest_pos++] = lsample; + dest_buffer[dest_pos++] = rsample; + } + break; + } + + return dest_size; +} |