5 #include "sample-util.h"
7 struct pa_memblock *pa_silence_memblock(struct pa_memblock* b, const struct pa_sample_spec *spec) {
8 assert(b && b->data && spec);
9 pa_silence_memory(b->data, b->length, spec);
13 void pa_silence_memchunk(struct pa_memchunk *c, const struct pa_sample_spec *spec) {
14 assert(c && c->memblock && c->memblock->data && spec && c->length);
15 pa_silence_memory(c->memblock->data+c->index, c->length, spec);
18 void pa_silence_memory(void *p, size_t length, const struct pa_sample_spec *spec) {
20 assert(p && length && spec);
22 switch (spec->format) {
28 case PA_SAMPLE_FLOAT32:
42 size_t pa_mix(struct pa_mix_info channels[], unsigned nchannels, void *data, size_t length, const struct pa_sample_spec *spec, uint32_t volume) {
44 assert(channels && data && length && spec);
45 assert(spec->format == PA_SAMPLE_S16NE);
47 for (d = 0;; d += sizeof(int16_t)) {
53 for (c = 0; c < nchannels; c++) {
55 uint32_t volume = channels[c].volume;
57 if (d >= channels[c].chunk.length)
60 if (volume == PA_VOLUME_MUTE)
63 v = *((int16_t*) (channels[c].chunk.memblock->data + channels[c].chunk.index + d));
65 if (volume != PA_VOLUME_NORM)
66 v = (int32_t) ((float)v*volume/PA_VOLUME_NORM);
72 if (volume == PA_VOLUME_MUTE)
74 else if (volume != PA_VOLUME_NORM)
75 sum = (int32_t) ((float) sum*volume/PA_VOLUME_NORM);
77 if (sum < -0x8000) sum = -0x8000;
78 if (sum > 0x7FFF) sum = 0x7FFF;
80 *((int16_t*) data) = sum;
81 data += sizeof(int16_t);
86 void pa_volume_memchunk(struct pa_memchunk*c, const struct pa_sample_spec *spec, uint32_t volume) {
89 assert(c && spec && (c->length % pa_sample_size(spec) == 0));
90 assert(spec->format == PA_SAMPLE_S16NE);
92 if (volume == PA_VOLUME_NORM)
95 if (volume == PA_VOLUME_MUTE) {
96 pa_silence_memchunk(c, spec);
100 for (d = (c->memblock->data+c->index), n = c->length/sizeof(int16_t); n > 0; d++, n--) {
101 int32_t t = (int32_t)(*d);
106 if (t < -0x8000) t = -0x8000;
107 if (t > 0x7FFF) t = 0x7FFF;
113 uint32_t pa_volume_multiply(uint32_t a, uint32_t b) {