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Diffstat (limited to 'spa/plugins/alsa/acp/volume.h')
| -rw-r--r-- | spa/plugins/alsa/acp/volume.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/spa/plugins/alsa/acp/volume.h b/spa/plugins/alsa/acp/volume.h new file mode 100644 index 0000000..b916bd2 --- /dev/null +++ b/spa/plugins/alsa/acp/volume.h @@ -0,0 +1,207 @@ +/*** + This file is part of PulseAudio. + + Copyright 2004-2006 Lennart Poettering + Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB + + PulseAudio is free software; you can redistribute it and/or modify + it under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 2.1 of the License, + or (at your option) any later version. + + PulseAudio 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 Lesser General Public License + along with PulseAudio; if not, see <http://www.gnu.org/licenses/>. +***/ + +#ifndef PA_VOLUME_H +#define PA_VOLUME_H + +#ifdef __cplusplus +extern "C" { +#endif + +#include <math.h> + +typedef uint32_t pa_volume_t; + +#define PA_VOLUME_MUTED ((pa_volume_t) 0U) +#define PA_VOLUME_NORM ((pa_volume_t) 0x10000U) +#define PA_VOLUME_MAX ((pa_volume_t) UINT32_MAX/2) + +#ifdef INFINITY +#define PA_DECIBEL_MININFTY ((double) -INFINITY) +#else +#define PA_DECIBEL_MININFTY ((double) -200.0) +#endif + +#define PA_CLAMP_VOLUME(v) (PA_CLAMP_UNLIKELY((v), PA_VOLUME_MUTED, PA_VOLUME_MAX)) + +typedef struct pa_cvolume { + uint32_t channels; /**< Number of channels */ + pa_volume_t values[PA_CHANNELS_MAX]; /**< Per-channel volume */ +} pa_cvolume; + +static inline double pa_volume_linear_to_dB(double v) +{ + return 20.0 * log10(v); +} + +static inline double pa_sw_volume_to_linear(pa_volume_t v) +{ + double f; + if (v <= PA_VOLUME_MUTED) + return 0.0; + if (v == PA_VOLUME_NORM) + return 1.0; + f = ((double) v / PA_VOLUME_NORM); + return f*f*f; +} + +static inline double pa_sw_volume_to_dB(pa_volume_t v) +{ + if (v <= PA_VOLUME_MUTED) + return PA_DECIBEL_MININFTY; + return pa_volume_linear_to_dB(pa_sw_volume_to_linear(v)); +} + +static inline double pa_volume_dB_to_linear(double v) +{ + return pow(10.0, v / 20.0); +} + +static inline pa_volume_t pa_sw_volume_from_linear(double v) +{ + if (v <= 0.0) + return PA_VOLUME_MUTED; + return (pa_volume_t) PA_CLAMP_VOLUME((uint64_t) lround(cbrt(v) * PA_VOLUME_NORM)); +} + +static inline pa_volume_t pa_sw_volume_from_dB(double dB) +{ + if (isinf(dB) < 0 || dB <= PA_DECIBEL_MININFTY) + return PA_VOLUME_MUTED; + return pa_sw_volume_from_linear(pa_volume_dB_to_linear(dB)); +} + +static inline pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) +{ + uint32_t i; + a->channels = (uint8_t) channels; + for (i = 0; i < a->channels; i++) + a->values[i] = PA_CLAMP_VOLUME(v); + return a; +} + +static inline int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) +{ + uint32_t i; + if (PA_UNLIKELY(a == b)) + return 1; + if (a->channels != b->channels) + return 0; + for (i = 0; i < a->channels; i++) + if (a->values[i] != b->values[i]) + return 0; + return 1; +} + +static inline pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) +{ + uint64_t result; + result = ((uint64_t) a * (uint64_t) b + (uint64_t) PA_VOLUME_NORM / 2ULL) / + (uint64_t) PA_VOLUME_NORM; + if (result > (uint64_t)PA_VOLUME_MAX) + pa_log_warn("pa_sw_volume_multiply: Volume exceeds maximum allowed value and will be clipped. Please check your volume settings."); + return (pa_volume_t) PA_CLAMP_VOLUME(result); +} + +static inline pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, + const pa_cvolume *a, const pa_cvolume *b) +{ + unsigned i; + dest->channels = PA_MIN(a->channels, b->channels); + for (i = 0; i < dest->channels; i++) + dest->values[i] = pa_sw_volume_multiply(a->values[i], b->values[i]); + return dest; +} + +static inline pa_cvolume *pa_sw_cvolume_multiply_scalar(pa_cvolume *dest, + const pa_cvolume *a, pa_volume_t b) +{ + unsigned i; + for (i = 0; i < a->channels; i++) + dest->values[i] = pa_sw_volume_multiply(a->values[i], b); + dest->channels = (uint8_t) i; + return dest; +} + +static inline pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) +{ + uint64_t result; + if (b <= PA_VOLUME_MUTED) + return 0; + result = ((uint64_t) a * (uint64_t) PA_VOLUME_NORM + (uint64_t) b / 2ULL) / (uint64_t) b; + if (result > (uint64_t)PA_VOLUME_MAX) + pa_log_warn("pa_sw_volume_divide: Volume exceeds maximum allowed value and will be clipped. Please check your volume settings."); + return (pa_volume_t) PA_CLAMP_VOLUME(result); +} + +static inline pa_cvolume *pa_sw_cvolume_divide_scalar(pa_cvolume *dest, + const pa_cvolume *a, pa_volume_t b) { + unsigned i; + for (i = 0; i < a->channels; i++) + dest->values[i] = pa_sw_volume_divide(a->values[i], b); + dest->channels = (uint8_t) i; + return dest; +} + +static inline pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, + const pa_cvolume *a, const pa_cvolume *b) +{ + unsigned i; + dest->channels = PA_MIN(a->channels, b->channels); + for (i = 0; i < dest->channels; i++) + dest->values[i] = pa_sw_volume_divide(a->values[i], b->values[i]); + return dest; +} + +#define pa_cvolume_reset(a, n) pa_cvolume_set((a), (n), PA_VOLUME_NORM) +#define pa_cvolume_mute(a, n) pa_cvolume_set((a), (n), PA_VOLUME_MUTED) + +static inline int pa_cvolume_compatible_with_channel_map(const pa_cvolume *v, + const pa_channel_map *cm) +{ + return v->channels == cm->channels; +} + +static inline pa_volume_t pa_cvolume_max(const pa_cvolume *a) +{ + pa_volume_t m = PA_VOLUME_MUTED; + unsigned c; + for (c = 0; c < a->channels; c++) + if (a->values[c] > m) + m = a->values[c]; + return m; +} + +static inline pa_volume_t pa_cvolume_min(const pa_cvolume *a) +{ + pa_volume_t m = PA_VOLUME_MAX; + unsigned c; + for (c = 0; c < a->channels; c++) + if (a->values[c] < m) + m = a->values[c]; + return m; +} + + +#ifdef __cplusplus +} /* extern "C" */ +#endif + +#endif /* PA_VOLUME_H */ |