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Diffstat (limited to '')
| -rw-r--r-- | src/pcm_volume.c | 190 |
1 files changed, 0 insertions, 190 deletions
diff --git a/src/pcm_volume.c b/src/pcm_volume.c deleted file mode 100644 index 49c86026f..000000000 --- a/src/pcm_volume.c +++ /dev/null @@ -1,190 +0,0 @@ -/* - * 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 - * 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 "pcm_volume.h" -#include "pcm_utils.h" -#include "audio_format.h" - -#include <glib.h> - -#include <stdint.h> -#include <string.h> - -#undef G_LOG_DOMAIN -#define G_LOG_DOMAIN "pcm_volume" - -static void -pcm_volume_change_8(int8_t *buffer, const int8_t *end, int volume) -{ - while (buffer < end) { - int32_t sample = *buffer; - - sample = (sample * volume + pcm_volume_dither() + - PCM_VOLUME_1 / 2) - / PCM_VOLUME_1; - - *buffer++ = pcm_range(sample, 8); - } -} - -static void -pcm_volume_change_16(int16_t *buffer, const int16_t *end, int volume) -{ - while (buffer < end) { - int32_t sample = *buffer; - - sample = (sample * volume + pcm_volume_dither() + - PCM_VOLUME_1 / 2) - / PCM_VOLUME_1; - - *buffer++ = pcm_range(sample, 16); - } -} - -#ifdef __i386__ -/** - * Optimized volume function for i386. Use the EDX:EAX 2*32 bit - * multiplication result instead of emulating 64 bit multiplication. - */ -static inline int32_t -pcm_volume_sample_24(int32_t sample, int32_t volume, G_GNUC_UNUSED int32_t dither) -{ - int32_t result; - - asm(/* edx:eax = sample * volume */ - "imul %2\n" - - /* "add %3, %1\n" dithering disabled for now, because we - have no overflow check - is dithering really important - here? */ - - /* eax = edx:eax / PCM_VOLUME_1 */ - "sal $22, %%edx\n" - "shr $10, %1\n" - "or %%edx, %1\n" - - : "=a"(result) - : "0"(sample), "r"(volume) /* , "r"(dither) */ - : "edx" - ); - - return result; -} -#endif - -static void -pcm_volume_change_24(int32_t *buffer, const int32_t *end, int volume) -{ - while (buffer < end) { -#ifdef __i386__ - /* assembly version for i386 */ - int32_t sample = *buffer; - - sample = pcm_volume_sample_24(sample, volume, - pcm_volume_dither()); -#else - /* portable version */ - int64_t sample = *buffer; - - sample = (sample * volume + pcm_volume_dither() + - PCM_VOLUME_1 / 2) - / PCM_VOLUME_1; -#endif - *buffer++ = pcm_range(sample, 24); - } -} - -static void -pcm_volume_change_32(int32_t *buffer, const int32_t *end, int volume) -{ - while (buffer < end) { -#ifdef __i386__ - /* assembly version for i386 */ - int32_t sample = *buffer; - - *buffer++ = pcm_volume_sample_24(sample, volume, 0); -#else - /* portable version */ - int64_t sample = *buffer; - - sample = (sample * volume + pcm_volume_dither() + - PCM_VOLUME_1 / 2) - / PCM_VOLUME_1; - *buffer++ = pcm_range_64(sample, 32); -#endif - } -} - -static void -pcm_volume_change_float(float *buffer, const float *end, float volume) -{ - while (buffer < end) { - float sample = *buffer; - sample *= volume; - *buffer++ = sample; - } -} - -bool -pcm_volume(void *buffer, size_t length, - enum sample_format format, - int volume) -{ - if (volume == PCM_VOLUME_1) - return true; - - if (volume <= 0) { - memset(buffer, 0, length); - return true; - } - - const void *end = pcm_end_pointer(buffer, length); - switch (format) { - case SAMPLE_FORMAT_UNDEFINED: - case SAMPLE_FORMAT_DSD: - /* not implemented */ - return false; - - case SAMPLE_FORMAT_S8: - pcm_volume_change_8(buffer, end, volume); - return true; - - case SAMPLE_FORMAT_S16: - pcm_volume_change_16(buffer, end, volume); - return true; - - case SAMPLE_FORMAT_S24_P32: - pcm_volume_change_24(buffer, end, volume); - return true; - - case SAMPLE_FORMAT_S32: - pcm_volume_change_32(buffer, end, volume); - return true; - - case SAMPLE_FORMAT_FLOAT: - pcm_volume_change_float(buffer, end, - pcm_volume_to_float(volume)); - return true; - } - - /* unreachable */ - assert(false); - return false; -} |