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vidcap testcard audio: support for >1 channels

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This commit is contained in:
Martin Pulec
2023-09-18 08:59:57 +02:00
parent bdcb25875c
commit 7ff196e6ae
1 changed files with 15 additions and 4 deletions
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19
src/video_capture/testcard.c
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@@ -128,12 +128,23 @@ struct testcard_state {
};
static void configure_fallback_audio(struct testcard_state *s) {
static_assert(AUDIO_BPS == sizeof(int16_t), "Only 2-byte audio is supported for testcard audio at the moment");
static_assert(
AUDIO_BPS == sizeof(int16_t),
"Only 2-byte audio is supported for testcard audio at the moment");
const double scale = 0.1;
int16_t *out = (int16_t *) s->audio_data;
for (int i = 0; i < AUDIO_BUFFER_SIZE(s->audio.ch_count) / AUDIO_BPS; i += 1) {
*((int16_t*)(void *)(&s->audio_data[i * AUDIO_BPS])) = round(sin(((double) i / ((double) AUDIO_SAMPLE_RATE / s->audio_frequency)) * M_PI * 2. ) * ((1U << (AUDIO_BPS * 8U - 1)) - 1) * scale);
for (int i = 0; i < AUDIO_BUFFER_SIZE(s->audio.ch_count) / AUDIO_BPS /
s->audio.ch_count;
i += 1) {
const int16_t val =
round(sin(((double) i / ((double) AUDIO_SAMPLE_RATE /
s->audio_frequency)) *
M_PI * 2.) *
((1U << (AUDIO_BPS * CHAR_BIT - 1)) - 1) * scale);
for (int j = 0; j < s->audio.ch_count; ++j) {
*out++ = val;
}
}
}