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Switching to the lsr simple API. The problem with the full API is that the

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number of channels is specified when the converter state is created.
Previously this was only done once, thus breaking horribly when the input
audio suddenly had a different channel count.  A new state could be created
every time the number of channels changes, but this could happen many times
a second if resampling to two different formats at once.  The simple API
doesn't have this problem, as channel count is an argument to the
conversion function itself.

git-svn-id: https://svn.musicpd.org/mpd/trunk@6229 09075e82-0dd4-0310-85a5-a0d7c8717e4f
This commit is contained in:
J. Alexander Treuman 2007-05-23 10:31:07 +00:00
parent a70ecdc00c
commit fbb3a94f17
1 changed files with 7 additions and 19 deletions
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26
src/pcm_utils.c
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@ -191,31 +191,18 @@ static int pcm_convertSampleRate(mpd_sint8 channels, mpd_uint32 inSampleRate,
mpd_uint32 outSampleRate, char *outBuffer,
size_t outSize)
{
static SRC_STATE *state;
static int convalgo = -1;
static SRC_DATA data;
static size_t dataInSize;
static size_t dataOutSize;
size_t curDataInSize;
size_t curDataOutSize;
double ratio;
int error;
if (!state) {
state = src_new(pcm_getSampleRateConverter(), channels, &error);
if (!state) {
ERROR("Cannot create new samplerate state: %s\n",
src_strerror(error));
return 0;
}
DEBUG("Samplerate converter initialized\n");
}
if (convalgo < 0)
convalgo = pcm_getSampleRateConverter();
ratio = (double)outSampleRate / (double)inSampleRate;
if (ratio != data.src_ratio) {
DEBUG("Setting samplerate conversion ratio to %.2lf\n", ratio);
src_set_ratio(state, ratio);
data.src_ratio = ratio;
}
data.src_ratio = (double)outSampleRate / (double)inSampleRate;
data.input_frames = inSize / 2 / channels;
curDataInSize = data.input_frames * sizeof(float) * channels;
@ -234,9 +221,10 @@ static int pcm_convertSampleRate(mpd_sint8 channels, mpd_uint32 inSampleRate,
src_short_to_float_array((short *)inBuffer, data.data_in,
data.input_frames * channels);
error = src_process(state, &data);
error = src_simple(&data, convalgo, channels);
if (error) {
ERROR("Cannot process samples: %s\n", src_strerror(error));
ERROR("error processing samples with libsamplerate: %s\n",
src_strerror(error));
return 0;
}