diff options
Diffstat (limited to 'src/pcm_channels.c')
| -rw-r--r-- | src/pcm_channels.c | 118 |
1 files changed, 66 insertions, 52 deletions
diff --git a/src/pcm_channels.c b/src/pcm_channels.c index 34e72ca4e..ec2bd69a5 100644 --- a/src/pcm_channels.c +++ b/src/pcm_channels.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2003-2010 The Music Player Daemon Project + * Copyright (C) 2003-2011 The Music Player Daemon Project * http://www.musicpd.org * * This program is free software; you can redistribute it and/or modify @@ -20,14 +20,16 @@ #include "config.h" #include "pcm_channels.h" #include "pcm_buffer.h" +#include "pcm_utils.h" #include <assert.h> static void -pcm_convert_channels_16_1_to_2(int16_t *dest, const int16_t *src, - unsigned num_frames) +pcm_convert_channels_16_1_to_2(int16_t *restrict dest, + const int16_t *restrict src, + const int16_t *restrict src_end) { - while (num_frames-- > 0) { + while (src < src_end) { int16_t value = *src++; *dest++ = value; @@ -36,10 +38,11 @@ pcm_convert_channels_16_1_to_2(int16_t *dest, const int16_t *src, } static void -pcm_convert_channels_16_2_to_1(int16_t *dest, const int16_t *src, - unsigned num_frames) +pcm_convert_channels_16_2_to_1(int16_t *restrict dest, + const int16_t *restrict src, + const int16_t *restrict src_end) { - while (num_frames-- > 0) { + while (src < src_end) { int32_t a = *src++, b = *src++; *dest++ = (a + b) / 2; @@ -47,15 +50,16 @@ pcm_convert_channels_16_2_to_1(int16_t *dest, const int16_t *src, } static void -pcm_convert_channels_16_n_to_2(int16_t *dest, - unsigned src_channels, const int16_t *src, - unsigned num_frames) +pcm_convert_channels_16_n_to_2(int16_t *restrict dest, + unsigned src_channels, + const int16_t *restrict src, + const int16_t *restrict src_end) { unsigned c; assert(src_channels > 0); - while (num_frames-- > 0) { + while (src < src_end) { int32_t sum = 0; int16_t value; @@ -71,23 +75,25 @@ pcm_convert_channels_16_n_to_2(int16_t *dest, const int16_t * pcm_convert_channels_16(struct pcm_buffer *buffer, - uint8_t dest_channels, - uint8_t src_channels, const int16_t *src, + unsigned dest_channels, + unsigned src_channels, const int16_t *src, size_t src_size, size_t *dest_size_r) { - unsigned num_frames = src_size / src_channels / sizeof(*src); - unsigned dest_size = num_frames * dest_channels * sizeof(*src); - int16_t *dest = pcm_buffer_get(buffer, dest_size); + assert(src_size % (sizeof(*src) * src_channels) == 0); + size_t dest_size = src_size / src_channels * dest_channels; *dest_size_r = dest_size; + int16_t *dest = pcm_buffer_get(buffer, dest_size); + const int16_t *src_end = pcm_end_pointer(src, src_size); + if (src_channels == 1 && dest_channels == 2) - pcm_convert_channels_16_1_to_2(dest, src, num_frames); + pcm_convert_channels_16_1_to_2(dest, src, src_end); else if (src_channels == 2 && dest_channels == 1) - pcm_convert_channels_16_2_to_1(dest, src, num_frames); + pcm_convert_channels_16_2_to_1(dest, src, src_end); else if (dest_channels == 2) pcm_convert_channels_16_n_to_2(dest, src_channels, src, - num_frames); + src_end); else return NULL; @@ -95,10 +101,11 @@ pcm_convert_channels_16(struct pcm_buffer *buffer, } static void -pcm_convert_channels_24_1_to_2(int32_t *dest, const int32_t *src, - unsigned num_frames) +pcm_convert_channels_24_1_to_2(int32_t *restrict dest, + const int32_t *restrict src, + const int32_t *restrict src_end) { - while (num_frames-- > 0) { + while (src < src_end) { int32_t value = *src++; *dest++ = value; @@ -107,10 +114,11 @@ pcm_convert_channels_24_1_to_2(int32_t *dest, const int32_t *src, } static void -pcm_convert_channels_24_2_to_1(int32_t *dest, const int32_t *src, - unsigned num_frames) +pcm_convert_channels_24_2_to_1(int32_t *restrict dest, + const int32_t *restrict src, + const int32_t *restrict src_end) { - while (num_frames-- > 0) { + while (src < src_end) { int32_t a = *src++, b = *src++; *dest++ = (a + b) / 2; @@ -118,15 +126,16 @@ pcm_convert_channels_24_2_to_1(int32_t *dest, const int32_t *src, } static void -pcm_convert_channels_24_n_to_2(int32_t *dest, - unsigned src_channels, const int32_t *src, - unsigned num_frames) +pcm_convert_channels_24_n_to_2(int32_t *restrict dest, + unsigned src_channels, + const int32_t *restrict src, + const int32_t *restrict src_end) { unsigned c; assert(src_channels > 0); - while (num_frames-- > 0) { + while (src < src_end) { int32_t sum = 0; int32_t value; @@ -142,23 +151,25 @@ pcm_convert_channels_24_n_to_2(int32_t *dest, const int32_t * pcm_convert_channels_24(struct pcm_buffer *buffer, - uint8_t dest_channels, - uint8_t src_channels, const int32_t *src, + unsigned dest_channels, + unsigned src_channels, const int32_t *src, size_t src_size, size_t *dest_size_r) { - unsigned num_frames = src_size / src_channels / sizeof(*src); - unsigned dest_size = num_frames * dest_channels * sizeof(*src); - int32_t *dest = pcm_buffer_get(buffer, dest_size); + assert(src_size % (sizeof(*src) * src_channels) == 0); + size_t dest_size = src_size / src_channels * dest_channels; *dest_size_r = dest_size; + int32_t *dest = pcm_buffer_get(buffer, dest_size); + const int32_t *src_end = pcm_end_pointer(src, src_size); + if (src_channels == 1 && dest_channels == 2) - pcm_convert_channels_24_1_to_2(dest, src, num_frames); + pcm_convert_channels_24_1_to_2(dest, src, src_end); else if (src_channels == 2 && dest_channels == 1) - pcm_convert_channels_24_2_to_1(dest, src, num_frames); + pcm_convert_channels_24_2_to_1(dest, src, src_end); else if (dest_channels == 2) pcm_convert_channels_24_n_to_2(dest, src_channels, src, - num_frames); + src_end); else return NULL; @@ -167,16 +178,17 @@ pcm_convert_channels_24(struct pcm_buffer *buffer, static void pcm_convert_channels_32_1_to_2(int32_t *dest, const int32_t *src, - unsigned num_frames) + const int32_t *src_end) { - pcm_convert_channels_24_1_to_2(dest, src, num_frames); + pcm_convert_channels_24_1_to_2(dest, src, src_end); } static void -pcm_convert_channels_32_2_to_1(int32_t *dest, const int32_t *src, - unsigned num_frames) +pcm_convert_channels_32_2_to_1(int32_t *restrict dest, + const int32_t *restrict src, + const int32_t *restrict src_end) { - while (num_frames-- > 0) { + while (src < src_end) { int64_t a = *src++, b = *src++; *dest++ = (a + b) / 2; @@ -186,13 +198,13 @@ pcm_convert_channels_32_2_to_1(int32_t *dest, const int32_t *src, static void pcm_convert_channels_32_n_to_2(int32_t *dest, unsigned src_channels, const int32_t *src, - unsigned num_frames) + const int32_t *src_end) { unsigned c; assert(src_channels > 0); - while (num_frames-- > 0) { + while (src < src_end) { int64_t sum = 0; int32_t value; @@ -208,23 +220,25 @@ pcm_convert_channels_32_n_to_2(int32_t *dest, const int32_t * pcm_convert_channels_32(struct pcm_buffer *buffer, - uint8_t dest_channels, - uint8_t src_channels, const int32_t *src, + unsigned dest_channels, + unsigned src_channels, const int32_t *src, size_t src_size, size_t *dest_size_r) { - unsigned num_frames = src_size / src_channels / sizeof(*src); - unsigned dest_size = num_frames * dest_channels * sizeof(*src); - int32_t *dest = pcm_buffer_get(buffer, dest_size); + assert(src_size % (sizeof(*src) * src_channels) == 0); + size_t dest_size = src_size / src_channels * dest_channels; *dest_size_r = dest_size; + int32_t *dest = pcm_buffer_get(buffer, dest_size); + const int32_t *src_end = pcm_end_pointer(src, src_size); + if (src_channels == 1 && dest_channels == 2) - pcm_convert_channels_32_1_to_2(dest, src, num_frames); + pcm_convert_channels_32_1_to_2(dest, src, src_end); else if (src_channels == 2 && dest_channels == 1) - pcm_convert_channels_32_2_to_1(dest, src, num_frames); + pcm_convert_channels_32_2_to_1(dest, src, src_end); else if (dest_channels == 2) pcm_convert_channels_32_n_to_2(dest, src_channels, src, - num_frames); + src_end); else return NULL; |