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-rw-r--r--src/pcm_resample_fallback.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/src/pcm_resample_fallback.c b/src/pcm_resample_fallback.c
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+++ b/src/pcm_resample_fallback.c
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+/* 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;
+}