From af7cb932fb90204a8d80baf4cba75b82c4a3fd5a Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Thu, 23 Oct 2008 20:02:51 +0200 Subject: 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. --- src/pcm_resample_fallback.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) (limited to 'src/pcm_resample_fallback.c') diff --git a/src/pcm_resample_fallback.c b/src/pcm_resample_fallback.c index 0a913406..da7dcaab 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; +} -- cgit v1.2.3