1 files changed, 120 insertions, 0 deletions
diff --git a/src/pcm/PcmResampleFallback.cxx b/src/pcm/PcmResampleFallback.cxx
new file mode 100644
index 000000000..724894366
--- /dev/null
+++ b/src/pcm/PcmResampleFallback.cxx
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2003-2013 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 "config.h"
+#include "PcmResampleInternal.hxx"
+
+#include <assert.h>
+
+void
+pcm_resample_fallback_init(PcmResampler *state)
+{
+	pcm_buffer_init(&state->buffer);
+}
+
+void
+pcm_resample_fallback_deinit(PcmResampler *state)
+{
+	pcm_buffer_deinit(&state->buffer);
+}
+
+/* resampling code blatantly ripped from ESD */
+const int16_t *
+pcm_resample_fallback_16(PcmResampler *state,
+			 unsigned channels,
+			 unsigned src_rate,
+			 const int16_t *src_buffer, size_t src_size,
+			 unsigned dest_rate,
+			 size_t *dest_size_r)
+{
+	unsigned dest_pos = 0;
+	unsigned src_frames = src_size / channels / sizeof(*src_buffer);
+	unsigned dest_frames =
+		(src_frames * dest_rate + src_rate - 1) / src_rate;
+	unsigned dest_samples = dest_frames * channels;
+	size_t dest_size = dest_samples * sizeof(*src_buffer);
+	int16_t *dest_buffer = (int16_t *)
+		pcm_buffer_get(&state->buffer, dest_size);
+
+	assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
+
+	switch (channels) {
+	case 1:
+		while (dest_pos < dest_samples) {
+			unsigned src_pos = dest_pos * src_rate / dest_rate;
+
+			dest_buffer[dest_pos++] = src_buffer[src_pos];
+		}
+		break;
+	case 2:
+		while (dest_pos < dest_samples) {
+			unsigned src_pos = dest_pos * src_rate / dest_rate;
+			src_pos &= ~1;
+
+			dest_buffer[dest_pos++] = src_buffer[src_pos];
+			dest_buffer[dest_pos++] = src_buffer[src_pos + 1];
+		}
+		break;
+	}
+
+	*dest_size_r = dest_size;
+	return dest_buffer;
+}
+
+const int32_t *
+pcm_resample_fallback_32(PcmResampler *state,
+			 unsigned channels,
+			 unsigned src_rate,
+			 const int32_t *src_buffer, size_t src_size,
+			 unsigned dest_rate,
+			 size_t *dest_size_r)
+{
+	unsigned dest_pos = 0;
+	unsigned src_frames = src_size / channels / sizeof(*src_buffer);
+	unsigned dest_frames =
+		(src_frames * dest_rate + src_rate - 1) / src_rate;
+	unsigned dest_samples = dest_frames * channels;
+	size_t dest_size = dest_samples * sizeof(*src_buffer);
+	int32_t *dest_buffer = (int32_t *)
+		pcm_buffer_get(&state->buffer, dest_size);
+
+	assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
+
+	switch (channels) {
+	case 1:
+		while (dest_pos < dest_samples) {
+			unsigned src_pos = dest_pos * src_rate / dest_rate;
+
+			dest_buffer[dest_pos++] = src_buffer[src_pos];
+		}
+		break;
+	case 2:
+		while (dest_pos < dest_samples) {
+			unsigned src_pos = dest_pos * src_rate / dest_rate;
+			src_pos &= ~1;
+
+			dest_buffer[dest_pos++] = src_buffer[src_pos];
+			dest_buffer[dest_pos++] = src_buffer[src_pos + 1];
+		}
+		break;
+	}
+
+	*dest_size_r = dest_size;
+	return dest_buffer;
+}