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jack: support for 24 bit samples 

When the audio source provides 24 bit samples, don't bother to convert
(lossily) them to 16 bit before jack's floating point conversion - go
directly from 24 bit to float.
This commit is contained in:
Max Kellermann 2008-10-24 17:36:11 +02:00
parent b1adfaae43
commit f4e6bb2815
1 changed files with 32 additions and 1 deletions
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33
src/audioOutputs/audioOutput_jack.c
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@ -165,7 +165,10 @@ set_audioformat(struct jack_data *jd, struct audio_format *audio_format)
audio_format->sample_rate = jack_get_sample_rate(jd->client);
DEBUG("samplerate = %u\n", audio_format->sample_rate);
audio_format->channels = 2;
audio_format->bits = 16;
if (audio_format->bits != 16 && audio_format->bits != 24)
audio_format->bits = 24;
jd->bps = audio_format->channels
* sizeof(jack_default_audio_sample_t)
* audio_format->sample_rate;
@ -379,6 +382,29 @@ mpd_jack_write_samples_16(struct jack_data *jd, const int16_t *src,
}
}
static inline jack_default_audio_sample_t
sample_24_to_jack(int32_t sample)
{
return sample / (jack_default_audio_sample_t)(1 << (24 - 1));
}
static void
mpd_jack_write_samples_24(struct jack_data *jd, const int32_t *src,
unsigned num_samples)
{
jack_default_audio_sample_t sample;
while (num_samples-- > 0) {
sample = sample_24_to_jack(*src++);
jack_ringbuffer_write(jd->ringbuffer[0], (void*)&sample,
sizeof(sample));
sample = sample_24_to_jack(*src++);
jack_ringbuffer_write(jd->ringbuffer[1], (void*)&sample,
sizeof(sample));
}
}
static void
mpd_jack_write_samples(struct jack_data *jd, const void *src,
unsigned num_samples)
@ -389,6 +415,11 @@ mpd_jack_write_samples(struct jack_data *jd, const void *src,
num_samples);
break;
case 24:
mpd_jack_write_samples_24(jd, (const int32_t*)src,
num_samples);
break;
default:
assert(false);
}