diff options
Diffstat (limited to 'audio/out/ao.c')
| -rw-r--r-- | audio/out/ao.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/audio/out/ao.c b/audio/out/ao.c index da2dacdcae..c40eae1b92 100644 --- a/audio/out/ao.c +++ b/audio/out/ao.c @@ -18,6 +18,7 @@ #include <stdio.h> #include <stdlib.h> #include <string.h> +#include <math.h> #include <assert.h> #include "mpv_talloc.h" @@ -159,6 +160,7 @@ static struct ao *ao_alloc(bool probing, struct mpv_global *global, ao->priv = m_config_group_from_desc(ao, ao->log, global, &desc, name); if (!ao->priv) goto error; + ao_set_gain(ao, 1.0f); return ao; error: talloc_free(ao); @@ -638,6 +640,70 @@ void ao_print_devices(struct mpv_global *global, struct mp_log *log) ao_hotplug_destroy(hp); } +void ao_set_gain(struct ao *ao, float gain) +{ + uint_least32_t v = 0; + assert(sizeof(gain) <= sizeof(v)); + memcpy(&v, &gain, sizeof(gain)); + atomic_store(&ao->gain_fi, v); +} + +static float ao_get_gain(struct ao *ao) +{ + uint_least32_t v = atomic_load_explicit(&ao->gain_fi, memory_order_relaxed); + float gain; + assert(sizeof(gain) <= sizeof(v)); + memcpy(&gain, &v, sizeof(gain)); + return gain; +} + +#define MUL_GAIN_i(d, num_samples, gain, low, center, high) \ + for (int n = 0; n < (num_samples); n++) \ + (d)[n] = MPCLAMP( \ + ((((int64_t)((d)[n]) - (center)) * (gain) + 128) >> 8) + (center), \ + (low), (high)) + +#define MUL_GAIN_f(d, num_samples, gain) \ + for (int n = 0; n < (num_samples); n++) \ + (d)[n] = MPCLAMP(((d)[n]) * (gain), -1.0, 1.0) + +static void process_plane(struct ao *ao, void *data, int num_samples) +{ + float gain = ao_get_gain(ao); + int format = af_fmt_from_planar(ao->format); + if (gain == 1.0f) + return; + int gi = lrint(256.0 * gain); + switch (format) { + case AF_FORMAT_U8: + MUL_GAIN_i((uint8_t *)data, num_samples, gi, 0, 128, 255); + break; + case AF_FORMAT_S16: + MUL_GAIN_i((int16_t *)data, num_samples, gi, INT16_MIN, 0, INT16_MAX); + break; + case AF_FORMAT_S32: + MUL_GAIN_i((int32_t *)data, num_samples, gi, INT32_MIN, 0, INT32_MAX); + break; + case AF_FORMAT_FLOAT: + MUL_GAIN_f((float *)data, num_samples, gain); + break; + case AF_FORMAT_DOUBLE: + MUL_GAIN_f((double *)data, num_samples, gain); + break; + default:; + // all other sample formats are simply not supported + } +} + +void ao_post_process_data(struct ao *ao, void **data, int num_samples) +{ + bool planar = af_fmt_is_planar(ao->format); + int planes = planar ? ao->channels.num : 1; + int plane_samples = num_samples * (planar ? 1: ao->channels.num); + for (int n = 0; n < planes; n++) + process_plane(ao, data[n], plane_samples); +} + static int get_conv_type(struct ao_convert_fmt *fmt) { if (af_fmt_to_bytes(fmt->src_fmt) * 8 == fmt->dst_bits && !fmt->pad_msb) |