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authorMax Kellermann <max@duempel.org>2008-10-23 20:02:51 +0200
committerMax Kellermann <max@duempel.org>2008-10-23 20:02:51 +0200
commitaf7cb932fb90204a8d80baf4cba75b82c4a3fd5a (patch)
tree1531e0bf2e8974997ddc10608bf0702c2694dc9f /src/pcm_resample_fallback.c
parent5bbcbfb7cee1ba29dcb084066d52e3235019be17 (diff)
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pcm_resample: implemented 24 bit resampling
Similar to pcm_resample_16(), implement pcm_resample_24(). The 24 bit implementation is very similar, but it uses src_int_to_float_array() instead of src_short_to_float_array() before sending data to libsamplerate.
Diffstat (limited to 'src/pcm_resample_fallback.c')
-rw-r--r--src/pcm_resample_fallback.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/src/pcm_resample_fallback.c b/src/pcm_resample_fallback.c
index 0a913406c..da7dcaabe 100644
--- a/src/pcm_resample_fallback.c
+++ b/src/pcm_resample_fallback.c
@@ -58,3 +58,36 @@ pcm_resample_16(uint8_t channels,
return dest_size;
}
+
+size_t
+pcm_resample_24(uint8_t channels,
+ unsigned src_rate,
+ const int32_t *src_buffer, mpd_unused size_t src_size,
+ unsigned dest_rate,
+ int32_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 / sizeof(*dest_buffer);
+
+ switch (channels) {
+ case 1:
+ while (dest_pos < dest_samples) {
+ src_pos = dest_pos * src_rate / dest_rate;
+
+ dest_buffer[dest_pos++] = src_buffer[src_pos];
+ }
+ break;
+ case 2:
+ while (dest_pos < dest_samples) {
+ 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;
+ }
+
+ return dest_size;
+}