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-rw-r--r--src/pcm_resample.c28
-rw-r--r--src/pcm_resample.h20
-rw-r--r--src/pcm_resample_internal.h8
-rw-r--r--src/pcm_resample_libsamplerate.c39
4 files changed, 95 insertions, 0 deletions
diff --git a/src/pcm_resample.c b/src/pcm_resample.c
index 26f1431e8..892d1c633 100644
--- a/src/pcm_resample.c
+++ b/src/pcm_resample.c
@@ -76,6 +76,34 @@ void pcm_resample_deinit(struct pcm_resample_state *state)
pcm_resample_fallback_deinit(state);
}
+const float *
+pcm_resample_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)
+{
+#ifdef HAVE_LIBSAMPLERATE
+ if (pcm_resample_lsr_enabled())
+ return pcm_resample_lsr_float(state, channels,
+ src_rate, src_buffer, src_size,
+ dest_rate, dest_size_r,
+ error_r);
+#else
+ (void)error_r;
+#endif
+
+ /* sizeof(float)==sizeof(int32_t); the fallback resampler does
+ not do any math on the sample values, so this hack is
+ possible: */
+ return (const float *)
+ pcm_resample_fallback_32(state, channels,
+ src_rate, (const int32_t *)src_buffer,
+ src_size,
+ dest_rate, dest_size_r);
+}
+
const int16_t *
pcm_resample_16(struct pcm_resample_state *state,
unsigned channels,
diff --git a/src/pcm_resample.h b/src/pcm_resample.h
index 73f98ec01..24fa1d044 100644
--- a/src/pcm_resample.h
+++ b/src/pcm_resample.h
@@ -69,6 +69,26 @@ void pcm_resample_init(struct pcm_resample_state *state);
void pcm_resample_deinit(struct pcm_resample_state *state);
/**
+ * Resamples 32 bit float data.
+ *
+ * @param state an initialized pcm_resample_state object
+ * @param channels the number of channels
+ * @param src_rate the source sample rate
+ * @param src the source PCM buffer
+ * @param src_size the size of #src in bytes
+ * @param dest_rate the requested destination sample rate
+ * @param dest_size_r returns the number of bytes of the destination buffer
+ * @return the destination buffer
+ */
+const float *
+pcm_resample_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);
+
+/**
* Resamples 16 bit PCM data.
*
* @param state an initialized pcm_resample_state object
diff --git a/src/pcm_resample_internal.h b/src/pcm_resample_internal.h
index e947eebf7..0b0a05006 100644
--- a/src/pcm_resample_internal.h
+++ b/src/pcm_resample_internal.h
@@ -41,6 +41,14 @@ pcm_resample_lsr_init(struct pcm_resample_state *state);
void
pcm_resample_lsr_deinit(struct pcm_resample_state *state);
+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);
+
const int16_t *
pcm_resample_lsr_16(struct pcm_resample_state *state,
unsigned channels,
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,