diff options
Diffstat (limited to 'src/pulse/volume.c')
| -rw-r--r-- | src/pulse/volume.c | 991 |
1 files changed, 991 insertions, 0 deletions
diff --git a/src/pulse/volume.c b/src/pulse/volume.c new file mode 100644 index 0000000..fc6ac8d --- /dev/null +++ b/src/pulse/volume.c @@ -0,0 +1,991 @@ +/*** + This file is part of PulseAudio. + + Copyright 2004-2006 Lennart Poettering + + 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/>. +***/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <string.h> +#include <math.h> + +#include <pulsecore/core-util.h> +#include <pulsecore/i18n.h> +#include <pulsecore/macro.h> +#include <pulsecore/sample-util.h> + +#include "volume.h" + +int pa_cvolume_equal(const pa_cvolume *a, const pa_cvolume *b) { + int i; + pa_assert(a); + pa_assert(b); + + pa_return_val_if_fail(pa_cvolume_valid(a), 0); + + if (PA_UNLIKELY(a == b)) + return 1; + + pa_return_val_if_fail(pa_cvolume_valid(b), 0); + + 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; +} + +pa_cvolume* pa_cvolume_init(pa_cvolume *a) { + unsigned c; + + pa_assert(a); + + a->channels = 0; + + for (c = 0; c < PA_CHANNELS_MAX; c++) + a->values[c] = PA_VOLUME_INVALID; + + return a; +} + +pa_cvolume* pa_cvolume_set(pa_cvolume *a, unsigned channels, pa_volume_t v) { + int i; + + pa_assert(a); + pa_assert(pa_channels_valid(channels)); + + a->channels = (uint8_t) channels; + + for (i = 0; i < a->channels; i++) + /* Clamp in case there is stale data that exceeds the current + * PA_VOLUME_MAX */ + a->values[i] = PA_CLAMP_VOLUME(v); + + return a; +} + +pa_volume_t pa_cvolume_avg(const pa_cvolume *a) { + uint64_t sum = 0; + unsigned c; + + pa_assert(a); + pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED); + + for (c = 0; c < a->channels; c++) + sum += a->values[c]; + + sum /= a->channels; + + return (pa_volume_t) sum; +} + +pa_volume_t pa_cvolume_avg_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) { + uint64_t sum = 0; + unsigned c, n; + + pa_assert(a); + + if (!cm) + return pa_cvolume_avg(a); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED); + + for (c = n = 0; c < a->channels; c++) { + + if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask)) + continue; + + sum += a->values[c]; + n ++; + } + + if (n > 0) + sum /= n; + + return (pa_volume_t) sum; +} + +pa_volume_t pa_cvolume_max(const pa_cvolume *a) { + pa_volume_t m = PA_VOLUME_MUTED; + unsigned c; + + pa_assert(a); + pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED); + + for (c = 0; c < a->channels; c++) + if (a->values[c] > m) + m = a->values[c]; + + return m; +} + +pa_volume_t pa_cvolume_min(const pa_cvolume *a) { + pa_volume_t m = PA_VOLUME_MAX; + unsigned c; + + pa_assert(a); + pa_return_val_if_fail(pa_cvolume_valid(a), PA_VOLUME_MUTED); + + for (c = 0; c < a->channels; c++) + if (a->values[c] < m) + m = a->values[c]; + + return m; +} + +pa_volume_t pa_cvolume_max_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) { + pa_volume_t m = PA_VOLUME_MUTED; + unsigned c; + + pa_assert(a); + + if (!cm) + return pa_cvolume_max(a); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED); + + for (c = 0; c < a->channels; c++) { + + if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask)) + continue; + + if (a->values[c] > m) + m = a->values[c]; + } + + return m; +} + +pa_volume_t pa_cvolume_min_mask(const pa_cvolume *a, const pa_channel_map *cm, pa_channel_position_mask_t mask) { + pa_volume_t m = PA_VOLUME_MAX; + unsigned c; + + pa_assert(a); + + if (!cm) + return pa_cvolume_min(a); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(a, cm), PA_VOLUME_MUTED); + + for (c = 0; c < a->channels; c++) { + + if (!(PA_CHANNEL_POSITION_MASK(cm->map[c]) & mask)) + continue; + + if (a->values[c] < m) + m = a->values[c]; + } + + return m; +} + +pa_volume_t pa_sw_volume_multiply(pa_volume_t a, pa_volume_t b) { + uint64_t result; + + pa_return_val_if_fail(PA_VOLUME_IS_VALID(a), PA_VOLUME_INVALID); + pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), PA_VOLUME_INVALID); + + /* cbrt((a/PA_VOLUME_NORM)^3*(b/PA_VOLUME_NORM)^3)*PA_VOLUME_NORM = a*b/PA_VOLUME_NORM */ + + 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); +} + +pa_volume_t pa_sw_volume_divide(pa_volume_t a, pa_volume_t b) { + uint64_t result; + + pa_return_val_if_fail(PA_VOLUME_IS_VALID(a), PA_VOLUME_INVALID); + pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), PA_VOLUME_INVALID); + + 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); +} + +/* Amplitude, not power */ +static double linear_to_dB(double v) { + return 20.0 * log10(v); +} + +static double dB_to_linear(double v) { + return pow(10.0, v / 20.0); +} + +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(dB_to_linear(dB)); +} + +double pa_sw_volume_to_dB(pa_volume_t v) { + + pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), PA_DECIBEL_MININFTY); + + if (v <= PA_VOLUME_MUTED) + return PA_DECIBEL_MININFTY; + + return linear_to_dB(pa_sw_volume_to_linear(v)); +} + +pa_volume_t pa_sw_volume_from_linear(double v) { + + if (v <= 0.0) + return PA_VOLUME_MUTED; + + /* + * We use a cubic mapping here, as suggested and discussed here: + * + * http://www.robotplanet.dk/audio/audio_gui_design/ + * http://lists.linuxaudio.org/pipermail/linux-audio-dev/2009-May/thread.html#23151 + * + * We make sure that the conversion to linear and back yields the + * same volume value! That's why we need the lround() below! + */ + + return (pa_volume_t) PA_CLAMP_VOLUME((uint64_t) lround(cbrt(v) * PA_VOLUME_NORM)); +} + +double pa_sw_volume_to_linear(pa_volume_t v) { + double f; + + pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), 0.0); + + 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; +} + +char *pa_cvolume_snprint(char *s, size_t l, const pa_cvolume *c) { + unsigned channel; + bool first = true; + char *e; + + pa_assert(s); + pa_assert(l > 0); + pa_assert(c); + + pa_init_i18n(); + + if (!pa_cvolume_valid(c)) { + pa_snprintf(s, l, _("(invalid)")); + return s; + } + + *(e = s) = 0; + + for (channel = 0; channel < c->channels && l > 1; channel++) { + l -= pa_snprintf(e, l, "%s%u: %3u%%", + first ? "" : " ", + channel, + (unsigned)(((uint64_t)c->values[channel] * 100 + (uint64_t)PA_VOLUME_NORM / 2) / (uint64_t)PA_VOLUME_NORM)); + + e = strchr(e, 0); + first = false; + } + + return s; +} + +char *pa_volume_snprint(char *s, size_t l, pa_volume_t v) { + pa_assert(s); + pa_assert(l > 0); + + pa_init_i18n(); + + if (!PA_VOLUME_IS_VALID(v)) { + pa_snprintf(s, l, _("(invalid)")); + return s; + } + + pa_snprintf(s, l, "%3u%%", (unsigned)(((uint64_t)v * 100 + (uint64_t)PA_VOLUME_NORM / 2) / (uint64_t)PA_VOLUME_NORM)); + return s; +} + +char *pa_sw_cvolume_snprint_dB(char *s, size_t l, const pa_cvolume *c) { + unsigned channel; + bool first = true; + char *e; + + pa_assert(s); + pa_assert(l > 0); + pa_assert(c); + + pa_init_i18n(); + + if (!pa_cvolume_valid(c)) { + pa_snprintf(s, l, _("(invalid)")); + return s; + } + + *(e = s) = 0; + + for (channel = 0; channel < c->channels && l > 1; channel++) { + double f = pa_sw_volume_to_dB(c->values[channel]); + + l -= pa_snprintf(e, l, "%s%u: %0.2f dB", + first ? "" : " ", + channel, + isinf(f) < 0 || f <= PA_DECIBEL_MININFTY ? -INFINITY : f); + + e = strchr(e, 0); + first = false; + } + + return s; +} + +char *pa_cvolume_snprint_verbose(char *s, size_t l, const pa_cvolume *c, const pa_channel_map *map, int print_dB) { + char *current = s; + bool first = true; + + pa_assert(s); + pa_assert(l > 0); + pa_assert(c); + + pa_init_i18n(); + + if (!pa_cvolume_valid(c)) { + pa_snprintf(s, l, _("(invalid)")); + return s; + } + + pa_assert(!map || (map->channels == c->channels)); + pa_assert(!map || pa_channel_map_valid(map)); + + current[0] = 0; + + for (unsigned channel = 0; channel < c->channels && l > 1; channel++) { + char channel_position[32]; + size_t bytes_printed; + char buf[PA_VOLUME_SNPRINT_VERBOSE_MAX]; + + if (map) + pa_snprintf(channel_position, sizeof(channel_position), "%s", pa_channel_position_to_string(map->map[channel])); + else + pa_snprintf(channel_position, sizeof(channel_position), "%u", channel); + + bytes_printed = pa_snprintf(current, l, "%s%s: %s", + first ? "" : ", ", + channel_position, + pa_volume_snprint_verbose(buf, sizeof(buf), c->values[channel], print_dB)); + l -= bytes_printed; + current += bytes_printed; + first = false; + } + + return s; +} + +char *pa_sw_volume_snprint_dB(char *s, size_t l, pa_volume_t v) { + double f; + + pa_assert(s); + pa_assert(l > 0); + + pa_init_i18n(); + + if (!PA_VOLUME_IS_VALID(v)) { + pa_snprintf(s, l, _("(invalid)")); + return s; + } + + f = pa_sw_volume_to_dB(v); + pa_snprintf(s, l, "%0.2f dB", isinf(f) < 0 || f <= PA_DECIBEL_MININFTY ? -INFINITY : f); + + return s; +} + +char *pa_volume_snprint_verbose(char *s, size_t l, pa_volume_t v, int print_dB) { + char dB[PA_SW_VOLUME_SNPRINT_DB_MAX]; + + pa_assert(s); + pa_assert(l > 0); + + pa_init_i18n(); + + if (!PA_VOLUME_IS_VALID(v)) { + pa_snprintf(s, l, _("(invalid)")); + return s; + } + + pa_snprintf(s, l, "%" PRIu32 " / %3u%%%s%s", + v, + (unsigned)(((uint64_t)v * 100 + (uint64_t)PA_VOLUME_NORM / 2) / (uint64_t)PA_VOLUME_NORM), + print_dB ? " / " : "", + print_dB ? pa_sw_volume_snprint_dB(dB, sizeof(dB), v) : ""); + + return s; +} + +int pa_cvolume_channels_equal_to(const pa_cvolume *a, pa_volume_t v) { + unsigned c; + pa_assert(a); + + pa_return_val_if_fail(pa_cvolume_valid(a), 0); + pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), 0); + + for (c = 0; c < a->channels; c++) + if (a->values[c] != v) + return 0; + + return 1; +} + +pa_cvolume *pa_sw_cvolume_multiply(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) { + unsigned i; + + pa_assert(dest); + pa_assert(a); + pa_assert(b); + + pa_return_val_if_fail(pa_cvolume_valid(a), NULL); + pa_return_val_if_fail(pa_cvolume_valid(b), NULL); + + 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; +} + +pa_cvolume *pa_sw_cvolume_multiply_scalar(pa_cvolume *dest, const pa_cvolume *a, pa_volume_t b) { + unsigned i; + + pa_assert(dest); + pa_assert(a); + + pa_return_val_if_fail(pa_cvolume_valid(a), NULL); + pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), NULL); + + 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; +} + +pa_cvolume *pa_sw_cvolume_divide(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) { + unsigned i; + + pa_assert(dest); + pa_assert(a); + pa_assert(b); + + pa_return_val_if_fail(pa_cvolume_valid(a), NULL); + pa_return_val_if_fail(pa_cvolume_valid(b), NULL); + + 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; +} + +pa_cvolume *pa_sw_cvolume_divide_scalar(pa_cvolume *dest, const pa_cvolume *a, pa_volume_t b) { + unsigned i; + + pa_assert(dest); + pa_assert(a); + + pa_return_val_if_fail(pa_cvolume_valid(a), NULL); + pa_return_val_if_fail(PA_VOLUME_IS_VALID(b), NULL); + + 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; +} + +int pa_cvolume_valid(const pa_cvolume *v) { + unsigned c; + + pa_assert(v); + + if (!pa_channels_valid(v->channels)) + return 0; + + for (c = 0; c < v->channels; c++) + if (!PA_VOLUME_IS_VALID(v->values[c])) + return 0; + + return 1; +} + +static bool on_left(pa_channel_position_t p) { + return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_LEFT); +} + +static bool on_right(pa_channel_position_t p) { + return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_RIGHT); +} + +static bool on_center(pa_channel_position_t p) { + return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_CENTER); +} + +static bool on_hfe(pa_channel_position_t p) { + return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_HFE); +} + +static bool on_lfe(pa_channel_position_t p) { + return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_LFE); +} + +static bool on_front(pa_channel_position_t p) { + return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_FRONT); +} + +static bool on_rear(pa_channel_position_t p) { + return !!(PA_CHANNEL_POSITION_MASK(p) & PA_CHANNEL_POSITION_MASK_REAR); +} + +pa_cvolume *pa_cvolume_remap(pa_cvolume *v, const pa_channel_map *from, const pa_channel_map *to) { + int a, b; + pa_cvolume result; + + pa_assert(v); + pa_assert(from); + pa_assert(to); + + pa_return_val_if_fail(pa_channel_map_valid(to), NULL); + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, from), NULL); + + if (pa_channel_map_equal(from, to)) + return v; + + result.channels = to->channels; + + for (b = 0; b < to->channels; b++) { + pa_volume_t k = 0; + int n = 0; + + for (a = 0; a < from->channels; a++) + if (from->map[a] == to->map[b]) { + k += v->values[a]; + n ++; + } + + if (n <= 0) { + for (a = 0; a < from->channels; a++) + if ((on_left(from->map[a]) && on_left(to->map[b])) || + (on_right(from->map[a]) && on_right(to->map[b])) || + (on_center(from->map[a]) && on_center(to->map[b])) || + (on_lfe(from->map[a]) && on_lfe(to->map[b]))) { + + k += v->values[a]; + n ++; + } + } + + if (n <= 0) + k = pa_cvolume_avg(v); + else + k /= n; + + result.values[b] = k; + } + + *v = result; + return v; +} + +int pa_cvolume_compatible(const pa_cvolume *v, const pa_sample_spec *ss) { + + pa_assert(v); + pa_assert(ss); + + pa_return_val_if_fail(pa_cvolume_valid(v), 0); + pa_return_val_if_fail(pa_sample_spec_valid(ss), 0); + + return v->channels == ss->channels; +} + +int pa_cvolume_compatible_with_channel_map(const pa_cvolume *v, const pa_channel_map *cm) { + pa_assert(v); + pa_assert(cm); + + pa_return_val_if_fail(pa_cvolume_valid(v), 0); + pa_return_val_if_fail(pa_channel_map_valid(cm), 0); + + return v->channels == cm->channels; +} + +/* + * Returns the average volume of l and r, where l and r are two disjoint sets of channels + * (e g left and right, or front and rear). + */ +static void get_avg(const pa_channel_map *map, const pa_cvolume *v, pa_volume_t *l, pa_volume_t *r, + bool (*on_l)(pa_channel_position_t), bool (*on_r)(pa_channel_position_t)) { + int c; + pa_volume_t left = 0, right = 0; + unsigned n_left = 0, n_right = 0; + + pa_assert(v); + pa_assert(map); + pa_assert(map->channels == v->channels); + pa_assert(l); + pa_assert(r); + + for (c = 0; c < map->channels; c++) { + if (on_l(map->map[c])) { + left += v->values[c]; + n_left++; + } else if (on_r(map->map[c])) { + right += v->values[c]; + n_right++; + } + } + + if (n_left <= 0) + *l = PA_VOLUME_NORM; + else + *l = left / n_left; + + if (n_right <= 0) + *r = PA_VOLUME_NORM; + else + *r = right / n_right; +} + +float pa_cvolume_get_balance(const pa_cvolume *v, const pa_channel_map *map) { + pa_volume_t left, right; + + pa_assert(v); + pa_assert(map); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), 0.0f); + + if (!pa_channel_map_can_balance(map)) + return 0.0f; + + get_avg(map, v, &left, &right, on_left, on_right); + + if (left == right) + return 0.0f; + + /* 1.0, 0.0 => -1.0 + 0.0, 1.0 => 1.0 + 0.0, 0.0 => 0.0 + 0.5, 0.5 => 0.0 + 1.0, 0.5 => -0.5 + 1.0, 0.25 => -0.75 + 0.75, 0.25 => -0.66 + 0.5, 0.25 => -0.5 */ + + if (left > right) + return -1.0f + ((float) right / (float) left); + else + return 1.0f - ((float) left / (float) right); +} + +static pa_cvolume* set_balance(pa_cvolume *v, const pa_channel_map *map, float new_balance, + bool (*on_l)(pa_channel_position_t), bool (*on_r)(pa_channel_position_t)) { + + pa_volume_t left, nleft, right, nright, m; + unsigned c; + + get_avg(map, v, &left, &right, on_l, on_r); + + m = PA_MAX(left, right); + + if (new_balance <= 0) { + nright = (new_balance + 1.0f) * m; + nleft = m; + } else { + nleft = (1.0f - new_balance) * m; + nright = m; + } + + for (c = 0; c < map->channels; c++) { + if (on_l(map->map[c])) { + if (left == 0) + v->values[c] = nleft; + else + v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) nleft) / (uint64_t) left); + } else if (on_r(map->map[c])) { + if (right == 0) + v->values[c] = nright; + else + v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) nright) / (uint64_t) right); + } + } + + return v; +} + + +pa_cvolume* pa_cvolume_set_balance(pa_cvolume *v, const pa_channel_map *map, float new_balance) { + pa_assert(map); + pa_assert(v); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), NULL); + pa_return_val_if_fail(new_balance >= -1.0f, NULL); + pa_return_val_if_fail(new_balance <= 1.0f, NULL); + + if (!pa_channel_map_can_balance(map)) + return v; + + return set_balance(v, map, new_balance, on_left, on_right); +} + +pa_cvolume* pa_cvolume_scale(pa_cvolume *v, pa_volume_t max) { + unsigned c; + pa_volume_t t = 0; + + pa_assert(v); + + pa_return_val_if_fail(pa_cvolume_valid(v), NULL); + pa_return_val_if_fail(PA_VOLUME_IS_VALID(max), NULL); + + t = pa_cvolume_max(v); + + if (t <= PA_VOLUME_MUTED) + return pa_cvolume_set(v, v->channels, max); + + for (c = 0; c < v->channels; c++) + v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) max) / (uint64_t) t); + + return v; +} + +pa_cvolume* pa_cvolume_scale_mask(pa_cvolume *v, pa_volume_t max, const pa_channel_map *cm, pa_channel_position_mask_t mask) { + unsigned c; + pa_volume_t t = 0; + + pa_assert(v); + + pa_return_val_if_fail(PA_VOLUME_IS_VALID(max), NULL); + + if (!cm) + return pa_cvolume_scale(v, max); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, cm), NULL); + + t = pa_cvolume_max_mask(v, cm, mask); + + if (t <= PA_VOLUME_MUTED) + return pa_cvolume_set(v, v->channels, max); + + for (c = 0; c < v->channels; c++) + v->values[c] = (pa_volume_t) PA_CLAMP_VOLUME(((uint64_t) v->values[c] * (uint64_t) max) / (uint64_t) t); + + return v; +} + +float pa_cvolume_get_fade(const pa_cvolume *v, const pa_channel_map *map) { + pa_volume_t rear, front; + + pa_assert(v); + pa_assert(map); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), 0.0f); + + if (!pa_channel_map_can_fade(map)) + return 0.0f; + + get_avg(map, v, &rear, &front, on_rear, on_front); + + if (front == rear) + return 0.0f; + + if (rear > front) + return -1.0f + ((float) front / (float) rear); + else + return 1.0f - ((float) rear / (float) front); +} + +pa_cvolume* pa_cvolume_set_fade(pa_cvolume *v, const pa_channel_map *map, float new_fade) { + pa_assert(map); + pa_assert(v); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), NULL); + pa_return_val_if_fail(new_fade >= -1.0f, NULL); + pa_return_val_if_fail(new_fade <= 1.0f, NULL); + + if (!pa_channel_map_can_fade(map)) + return v; + + return set_balance(v, map, new_fade, on_rear, on_front); +} + +float pa_cvolume_get_lfe_balance(const pa_cvolume *v, const pa_channel_map *map) { + pa_volume_t hfe, lfe; + + pa_assert(v); + pa_assert(map); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), 0.0f); + + if (!pa_channel_map_can_lfe_balance(map)) + return 0.0f; + + get_avg(map, v, &hfe, &lfe, on_hfe, on_lfe); + + if (hfe == lfe) + return 0.0f; + + if (hfe > lfe) + return -1.0f + ((float) lfe / (float) hfe); + else + return 1.0f - ((float) hfe / (float) lfe); +} + +pa_cvolume* pa_cvolume_set_lfe_balance(pa_cvolume *v, const pa_channel_map *map, float new_balance) { + pa_assert(map); + pa_assert(v); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(v, map), NULL); + pa_return_val_if_fail(new_balance >= -1.0f, NULL); + pa_return_val_if_fail(new_balance <= 1.0f, NULL); + + if (!pa_channel_map_can_lfe_balance(map)) + return v; + + return set_balance(v, map, new_balance, on_hfe, on_lfe); +} + +pa_cvolume* pa_cvolume_set_position( + pa_cvolume *cv, + const pa_channel_map *map, + pa_channel_position_t t, + pa_volume_t v) { + + unsigned c; + bool good = false; + + pa_assert(cv); + pa_assert(map); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv, map), NULL); + pa_return_val_if_fail(t < PA_CHANNEL_POSITION_MAX, NULL); + pa_return_val_if_fail(PA_VOLUME_IS_VALID(v), NULL); + + for (c = 0; c < map->channels; c++) + if (map->map[c] == t) { + cv->values[c] = v; + good = true; + } + + return good ? cv : NULL; +} + +pa_volume_t pa_cvolume_get_position( + const pa_cvolume *cv, + const pa_channel_map *map, + pa_channel_position_t t) { + + unsigned c; + pa_volume_t v = PA_VOLUME_MUTED; + + pa_assert(cv); + pa_assert(map); + + pa_return_val_if_fail(pa_cvolume_compatible_with_channel_map(cv, map), PA_VOLUME_MUTED); + pa_return_val_if_fail(t < PA_CHANNEL_POSITION_MAX, PA_VOLUME_MUTED); + + for (c = 0; c < map->channels; c++) + if (map->map[c] == t) + if (cv->values[c] > v) + v = cv->values[c]; + + return v; +} + +pa_cvolume* pa_cvolume_merge(pa_cvolume *dest, const pa_cvolume *a, const pa_cvolume *b) { + unsigned i; + + pa_assert(dest); + pa_assert(a); + pa_assert(b); + + pa_return_val_if_fail(pa_cvolume_valid(a), NULL); + pa_return_val_if_fail(pa_cvolume_valid(b), NULL); + + dest->channels = PA_MIN(a->channels, b->channels); + + for (i = 0; i < dest->channels; i++) + dest->values[i] = PA_MAX(a->values[i], b->values[i]); + + return dest; +} + +pa_cvolume* pa_cvolume_inc_clamp(pa_cvolume *v, pa_volume_t inc, pa_volume_t limit) { + pa_volume_t m; + + pa_assert(v); + + pa_return_val_if_fail(pa_cvolume_valid(v), NULL); + pa_return_val_if_fail(PA_VOLUME_IS_VALID(inc), NULL); + + m = pa_cvolume_max(v); + + if (m >= limit - inc) + m = limit; + else + m += inc; + + return pa_cvolume_scale(v, m); +} + +pa_cvolume* pa_cvolume_inc(pa_cvolume *v, pa_volume_t inc) { + return pa_cvolume_inc_clamp(v, inc, PA_VOLUME_MAX); +} + +pa_cvolume* pa_cvolume_dec(pa_cvolume *v, pa_volume_t dec) { + pa_volume_t m; + + pa_assert(v); + + pa_return_val_if_fail(pa_cvolume_valid(v), NULL); + pa_return_val_if_fail(PA_VOLUME_IS_VALID(dec), NULL); + + m = pa_cvolume_max(v); + + if (m <= PA_VOLUME_MUTED + dec) + m = PA_VOLUME_MUTED; + else + m -= dec; + + return pa_cvolume_scale(v, m); +} |