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- From 79067e661558983f6811f1281f21c5073d0d19c6 Mon Sep 17 00:00:00 2001
- From: falkTX <falktx@falktx.com>
- Date: Wed, 10 Mar 2021 14:22:10 +0000
- Subject: [PATCH] eg-sampler: Convert an arbitrary non-mono audio files to mono
-
- Signed-off-by: falkTX <falktx@falktx.com>
- ---
- plugins/eg-sampler.lv2/sampler.c | 28 ++++++++++++++++++++++++----
- 1 file changed, 24 insertions(+), 4 deletions(-)
-
- diff --git a/plugins/eg-sampler.lv2/sampler.c b/plugins/eg-sampler.lv2/sampler.c
- index 6c64df51..9675003d 100644
- --- a/plugins/eg-sampler.lv2/sampler.c
- +++ b/plugins/eg-sampler.lv2/sampler.c
- @@ -95,6 +95,23 @@ typedef struct {
- Sample* sample;
- } SampleMessage;
-
- +/**
- + Convert an arbitrary non-mono audio buffer to mono.
- +
- + This simply ignores the data on all channels but the first.
- +*/
- +static sf_count_t
- +convert_to_mono(float *data, sf_count_t num_input_frames, uint32_t channels)
- +{
- + sf_count_t num_output_frames = 0;
- +
- + for (sf_count_t i = 0; i < num_input_frames * channels; i += channels) {
- + data[num_output_frames++] = data[i];
- + }
- +
- + return num_output_frames;
- +}
- +
- /**
- Load a new sample and return it.
-
- @@ -115,9 +132,7 @@ load_sample(LV2_Log_Logger* logger, const char* path)
- bool error = true;
- if (!sndfile || !info->frames) {
- lv2_log_error(logger, "Failed to open %s\n", path);
- - } else if (info->channels != 1) {
- - lv2_log_error(logger, "%s has %d channels\n", path, info->channels);
- - } else if (!(data = (float*)malloc(sizeof(float) * info->frames))) {
- + } else if (!(data = (float*)malloc(sizeof(float) * info->frames * info->channels))) {
- lv2_log_error(logger, "Failed to allocate memory for sample\n");
- } else {
- error = false;
- @@ -131,9 +146,14 @@ load_sample(LV2_Log_Logger* logger, const char* path)
- }
-
- sf_seek(sndfile, 0ul, SEEK_SET);
- - sf_read_float(sndfile, data, info->frames);
- + sf_read_float(sndfile, data, info->frames * info->channels);
- sf_close(sndfile);
-
- + if (info->channels != 1) {
- + info->frames = convert_to_mono(data, info->frames, info->channels);
- + info->channels = 1;
- + }
- +
- // Fill sample struct and return it
- sample->data = data;
- sample->path = (char*)malloc(path_len + 1);
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