diff options
Diffstat (limited to 'src/pcm/Volume.cxx')
| -rw-r--r-- | src/pcm/Volume.cxx | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/src/pcm/Volume.cxx b/src/pcm/Volume.cxx new file mode 100644 index 000000000..988d3fbbf --- /dev/null +++ b/src/pcm/Volume.cxx @@ -0,0 +1,183 @@ +/* + * 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 "Volume.hxx" +#include "Domain.hxx" +#include "PcmUtils.hxx" +#include "Traits.hxx" +#include "util/ConstBuffer.hxx" +#include "util/Error.hxx" + +#include "PcmDither.cxx" // including the .cxx file to get inlined templates + +#include <stdint.h> +#include <string.h> + +template<SampleFormat F, class Traits=SampleTraits<F>> +static inline typename Traits::value_type +pcm_volume_sample(PcmDither &dither, + typename Traits::value_type _sample, + int volume) +{ + typename Traits::long_type sample(_sample); + + return dither.DitherShift<typename Traits::long_type, + Traits::BITS + PCM_VOLUME_BITS, + Traits::BITS>(sample * volume); +} + +template<SampleFormat F, class Traits=SampleTraits<F>> +static void +pcm_volume_change(PcmDither &dither, + typename Traits::pointer_type dest, + typename Traits::const_pointer_type src, + size_t n, + int volume) +{ + for (size_t i = 0; i != n; ++i) + dest[i] = pcm_volume_sample<F, Traits>(dither, src[i], volume); +} + +static void +pcm_volume_change_8(PcmDither &dither, + int8_t *dest, const int8_t *src, size_t n, + int volume) +{ + pcm_volume_change<SampleFormat::S8>(dither, dest, src, n, volume); +} + +static void +pcm_volume_change_16(PcmDither &dither, + int16_t *dest, const int16_t *src, size_t n, + int volume) +{ + pcm_volume_change<SampleFormat::S16>(dither, dest, src, n, volume); +} + +static void +pcm_volume_change_24(PcmDither &dither, + int32_t *dest, const int32_t *src, size_t n, + int volume) +{ + pcm_volume_change<SampleFormat::S24_P32>(dither, dest, src, n, + volume); +} + +static void +pcm_volume_change_32(PcmDither &dither, + int32_t *dest, const int32_t *src, size_t n, + int volume) +{ + pcm_volume_change<SampleFormat::S32>(dither, dest, src, n, volume); +} + +static void +pcm_volume_change_float(float *dest, const float *src, size_t n, + float volume) +{ + for (size_t i = 0; i != n; ++i) + dest[i] = src[i] * volume; +} + +bool +PcmVolume::Open(SampleFormat _format, Error &error) +{ + assert(format == SampleFormat::UNDEFINED); + + switch (_format) { + case SampleFormat::UNDEFINED: + case SampleFormat::DSD: + error.Format(pcm_domain, + "Software volume for %s is not implemented", + sample_format_to_string(_format)); + return false; + + case SampleFormat::S8: + case SampleFormat::S16: + case SampleFormat::S24_P32: + case SampleFormat::S32: + case SampleFormat::FLOAT: + break; + } + + format = _format; + return true; +} + +ConstBuffer<void> +PcmVolume::Apply(ConstBuffer<void> src) +{ + if (volume == PCM_VOLUME_1) + return src; + + void *data = buffer.Get(src.size); + + if (volume == 0) { + /* optimized special case: 0% volume = memset(0) */ + /* TODO: is this valid for all sample formats? What + about floating point? */ + memset(data, 0, src.size); + return { data, src.size }; + } + + switch (format) { + case SampleFormat::UNDEFINED: + case SampleFormat::DSD: + assert(false); + gcc_unreachable(); + + case SampleFormat::S8: + pcm_volume_change_8(dither, (int8_t *)data, + (const int8_t *)src.data, + src.size / sizeof(int8_t), + volume); + break; + + case SampleFormat::S16: + pcm_volume_change_16(dither, (int16_t *)data, + (const int16_t *)src.data, + src.size / sizeof(int16_t), + volume); + break; + + case SampleFormat::S24_P32: + pcm_volume_change_24(dither, (int32_t *)data, + (const int32_t *)src.data, + src.size / sizeof(int32_t), + volume); + break; + + case SampleFormat::S32: + pcm_volume_change_32(dither, (int32_t *)data, + (const int32_t *)src.data, + src.size / sizeof(int32_t), + volume); + break; + + case SampleFormat::FLOAT: + pcm_volume_change_float((float *)data, + (const float *)src.data, + src.size / sizeof(float), + pcm_volume_to_float(volume)); + break; + } + + return { data, src.size }; +} |