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authorMax Kellermann <max@duempel.org>2011-10-08 13:41:39 +0200
committerMax Kellermann <max@duempel.org>2011-10-20 02:24:25 +0200
commit725e48fce4e4ad08a2a9aa0a64c3e79df5636108 (patch)
tree48c95e6a1ce0fd0a4b6c3b4e08218e2cbceb357b /src/pcm_resample_libsamplerate.c
parent43816c268ba71b0946986f28146213aac99c9872 (diff)
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pcm_resample: add function pcm_resample_float()
A version of the resampler that doesn't need int->float->int conversion.
Diffstat (limited to 'src/pcm_resample_libsamplerate.c')
-rw-r--r--src/pcm_resample_libsamplerate.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/src/pcm_resample_libsamplerate.c b/src/pcm_resample_libsamplerate.c
index 884874373..c1b1760a9 100644
--- a/src/pcm_resample_libsamplerate.c
+++ b/src/pcm_resample_libsamplerate.c
@@ -157,6 +157,45 @@ lsr_process(struct pcm_resample_state *state, GError **error_r)
return true;
}
+static float *
+deconst_float_buffer(const float *in)
+{
+ union {
+ const float *in;
+ float *out;
+ } u = { .in = in };
+ return u.out;
+}
+
+const float *
+pcm_resample_lsr_float(struct pcm_resample_state *state,
+ unsigned channels,
+ unsigned src_rate,
+ const float *src_buffer, size_t src_size,
+ unsigned dest_rate, size_t *dest_size_r,
+ GError **error_r)
+{
+ assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
+
+ if (!pcm_resample_set(state, channels, src_rate, dest_rate, error_r))
+ return NULL;
+
+ SRC_DATA *data = &state->data;
+ data->input_frames = src_size / sizeof(*src_buffer) / channels;
+ data->data_in = deconst_float_buffer(src_buffer);
+
+ data->output_frames = (src_size * dest_rate + src_rate - 1) / src_rate;
+ size_t data_out_size = data->output_frames * sizeof(float) * channels;
+ data->data_out = pcm_buffer_get(&state->out, data_out_size);
+
+ if (!lsr_process(state, error_r))
+ return NULL;
+
+ *dest_size_r = data->output_frames_gen *
+ sizeof(*data->data_out) * channels;
+ return data->data_out;
+}
+
const int16_t *
pcm_resample_lsr_16(struct pcm_resample_state *state,
unsigned channels,