291 lines
6.9 KiB
C++
291 lines
6.9 KiB
C++
/*
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* Copyright (C) 2003-2013 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "PcmChannels.hxx"
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#include "PcmBuffer.hxx"
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#include "PcmUtils.hxx"
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#include <assert.h>
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template<typename D, typename S>
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static void
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MonoToStereo(D dest, S src, S end)
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{
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while (src != end) {
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const auto value = *src++;
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*dest++ = value;
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*dest++ = value;
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}
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}
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static void
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pcm_convert_channels_16_2_to_1(int16_t *gcc_restrict dest,
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const int16_t *gcc_restrict src,
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const int16_t *gcc_restrict src_end)
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{
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while (src < src_end) {
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int32_t a = *src++, b = *src++;
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*dest++ = (a + b) / 2;
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}
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}
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static void
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pcm_convert_channels_16_n_to_2(int16_t *gcc_restrict dest,
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unsigned src_channels,
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const int16_t *gcc_restrict src,
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const int16_t *gcc_restrict src_end)
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{
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unsigned c;
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assert(src_channels > 0);
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while (src < src_end) {
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int32_t sum = 0;
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int16_t value;
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for (c = 0; c < src_channels; ++c)
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sum += *src++;
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value = sum / (int)src_channels;
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/* XXX this is actually only mono ... */
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*dest++ = value;
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*dest++ = value;
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}
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}
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const int16_t *
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pcm_convert_channels_16(PcmBuffer &buffer,
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unsigned dest_channels,
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unsigned src_channels, const int16_t *src,
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size_t src_size, size_t *dest_size_r)
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{
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assert(src_size % (sizeof(*src) * src_channels) == 0);
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size_t dest_size = src_size / src_channels * dest_channels;
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*dest_size_r = dest_size;
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int16_t *dest = (int16_t *)buffer.Get(dest_size);
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const int16_t *src_end = pcm_end_pointer(src, src_size);
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if (src_channels == 1 && dest_channels == 2)
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MonoToStereo(dest, src, src_end);
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else if (src_channels == 2 && dest_channels == 1)
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pcm_convert_channels_16_2_to_1(dest, src, src_end);
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else if (dest_channels == 2)
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pcm_convert_channels_16_n_to_2(dest, src_channels, src,
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src_end);
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else
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return nullptr;
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return dest;
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}
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static void
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pcm_convert_channels_24_2_to_1(int32_t *gcc_restrict dest,
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const int32_t *gcc_restrict src,
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const int32_t *gcc_restrict src_end)
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{
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while (src < src_end) {
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int32_t a = *src++, b = *src++;
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*dest++ = (a + b) / 2;
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}
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}
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static void
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pcm_convert_channels_24_n_to_2(int32_t *gcc_restrict dest,
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unsigned src_channels,
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const int32_t *gcc_restrict src,
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const int32_t *gcc_restrict src_end)
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{
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unsigned c;
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assert(src_channels > 0);
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while (src < src_end) {
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int32_t sum = 0;
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int32_t value;
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for (c = 0; c < src_channels; ++c)
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sum += *src++;
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value = sum / (int)src_channels;
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/* XXX this is actually only mono ... */
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*dest++ = value;
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*dest++ = value;
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}
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}
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const int32_t *
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pcm_convert_channels_24(PcmBuffer &buffer,
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unsigned dest_channels,
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unsigned src_channels, const int32_t *src,
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size_t src_size, size_t *dest_size_r)
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{
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assert(src_size % (sizeof(*src) * src_channels) == 0);
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size_t dest_size = src_size / src_channels * dest_channels;
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*dest_size_r = dest_size;
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int32_t *dest = (int32_t *)buffer.Get(dest_size);
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const int32_t *src_end = (const int32_t *)
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pcm_end_pointer(src, src_size);
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if (src_channels == 1 && dest_channels == 2)
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MonoToStereo(dest, src, src_end);
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else if (src_channels == 2 && dest_channels == 1)
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pcm_convert_channels_24_2_to_1(dest, src, src_end);
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else if (dest_channels == 2)
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pcm_convert_channels_24_n_to_2(dest, src_channels, src,
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src_end);
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else
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return nullptr;
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return dest;
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}
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static void
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pcm_convert_channels_32_2_to_1(int32_t *gcc_restrict dest,
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const int32_t *gcc_restrict src,
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const int32_t *gcc_restrict src_end)
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{
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while (src < src_end) {
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int64_t a = *src++, b = *src++;
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*dest++ = (a + b) / 2;
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}
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}
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static void
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pcm_convert_channels_32_n_to_2(int32_t *dest,
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unsigned src_channels, const int32_t *src,
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const int32_t *src_end)
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{
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unsigned c;
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assert(src_channels > 0);
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while (src < src_end) {
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int64_t sum = 0;
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int32_t value;
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for (c = 0; c < src_channels; ++c)
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sum += *src++;
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value = sum / (int64_t)src_channels;
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/* XXX this is actually only mono ... */
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*dest++ = value;
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*dest++ = value;
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}
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}
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const int32_t *
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pcm_convert_channels_32(PcmBuffer &buffer,
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unsigned dest_channels,
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unsigned src_channels, const int32_t *src,
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size_t src_size, size_t *dest_size_r)
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{
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assert(src_size % (sizeof(*src) * src_channels) == 0);
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size_t dest_size = src_size / src_channels * dest_channels;
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*dest_size_r = dest_size;
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int32_t *dest = (int32_t *)buffer.Get(dest_size);
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const int32_t *src_end = (const int32_t *)
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pcm_end_pointer(src, src_size);
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if (src_channels == 1 && dest_channels == 2)
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MonoToStereo(dest, src, src_end);
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else if (src_channels == 2 && dest_channels == 1)
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pcm_convert_channels_32_2_to_1(dest, src, src_end);
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else if (dest_channels == 2)
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pcm_convert_channels_32_n_to_2(dest, src_channels, src,
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src_end);
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else
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return nullptr;
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return dest;
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}
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static void
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pcm_convert_channels_float_2_to_1(float *gcc_restrict dest,
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const float *gcc_restrict src,
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const float *gcc_restrict src_end)
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{
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while (src < src_end) {
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double a = *src++, b = *src++;
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*dest++ = (a + b) / 2;
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}
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}
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static void
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pcm_convert_channels_float_n_to_2(float *dest,
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unsigned src_channels, const float *src,
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const float *src_end)
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{
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unsigned c;
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assert(src_channels > 0);
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while (src < src_end) {
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double sum = 0;
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float value;
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for (c = 0; c < src_channels; ++c)
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sum += *src++;
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value = sum / (double)src_channels;
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/* XXX this is actually only mono ... */
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*dest++ = value;
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*dest++ = value;
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}
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}
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const float *
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pcm_convert_channels_float(PcmBuffer &buffer,
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unsigned dest_channels,
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unsigned src_channels, const float *src,
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size_t src_size, size_t *dest_size_r)
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{
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assert(src_size % (sizeof(*src) * src_channels) == 0);
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size_t dest_size = src_size / src_channels * dest_channels;
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*dest_size_r = dest_size;
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float *dest = (float *)buffer.Get(dest_size);
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const float *src_end = (const float *)pcm_end_pointer(src, src_size);
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if (src_channels == 1 && dest_channels == 2)
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MonoToStereo(dest, src, src_end);
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else if (src_channels == 2 && dest_channels == 1)
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pcm_convert_channels_float_2_to_1(dest, src, src_end);
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else if (dest_channels == 2)
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pcm_convert_channels_float_n_to_2(dest, src_channels, src,
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src_end);
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else
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return nullptr;
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return dest;
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}
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