const int32_t *
pcm_resample_lsr_32(struct pcm_resample_state *state,
uint8_t channels,
unsigned src_rate,
const int32_t *src_buffer, size_t src_size,
unsigned dest_rate, size_t *dest_size_r,
GError **error_r)
{
bool success;
SRC_DATA *data = &state->data;
size_t data_in_size;
size_t data_out_size;
int error;
int32_t *dest_buffer;
assert((src_size % (sizeof(*src_buffer) * channels)) == 0);
success = pcm_resample_set(state, channels, src_rate, dest_rate,
error_r);
if (!success)
return NULL;
/* there was an error previously, and nothing has changed */
if (state->error) {
g_set_error(error_r, libsamplerate_quark(), state->error,
"libsamplerate has failed: %s",
src_strerror(state->error));
return NULL;
}
data->input_frames = src_size / sizeof(*src_buffer) / channels;
data_in_size = data->input_frames * sizeof(float) * channels;
data->data_in = pcm_buffer_get(&state->in, data_in_size);
data->output_frames = (src_size * dest_rate + src_rate - 1) / src_rate;
data_out_size = data->output_frames * sizeof(float) * channels;
data->data_out = pcm_buffer_get(&state->out, data_out_size);
src_int_to_float_array(src_buffer, data->data_in,
data->input_frames * channels);
error = src_process(state->state, data);
if (error) {
g_set_error(error_r, libsamplerate_quark(), error,
"libsamplerate has failed: %s",
src_strerror(error));
state->error = error;
return NULL;
}
*dest_size_r = data->output_frames_gen *
sizeof(*dest_buffer) * channels;
dest_buffer = pcm_buffer_get(&state->buffer, *dest_size_r);
src_float_to_int_array(data->data_out, dest_buffer,
data->output_frames_gen * channels);
return dest_buffer;
}
bool
pcm_resample_lsr_global_init(const char *converter, GError **error_r)
{
if (!lsr_parse_converter(converter)) {
g_set_error(error_r, libsamplerate_quark(), 0,
"unknown samplerate converter '%s'", converter);
return false;
}
g_debug("libsamplerate converter '%s'",
src_get_name(lsr_converter));
return true;
}
static bool
lsr_process(struct pcm_resample_state *state, GError **error_r)
{
if (state->error == 0)
state->error = src_process(state->state, &state->data);
if (state->error) {
g_set_error(error_r, libsamplerate_quark(), state->error,
"libsamplerate has failed: %s",
src_strerror(state->error));
return false;
}
return true;
}
static bool
pcm_resample_set(struct pcm_resample_state *state,
uint8_t channels, unsigned src_rate, unsigned dest_rate,
GError **error_r)
{
static int convalgo = -1;
int error;
SRC_DATA *data = &state->data;
if (convalgo < 0)
convalgo = pcm_resample_get_converter();
/* (re)set the state/ratio if the in or out format changed */
if (channels == state->prev.channels &&
src_rate == state->prev.src_rate &&
dest_rate == state->prev.dest_rate)
return true;
state->error = 0;
state->prev.channels = channels;
state->prev.src_rate = src_rate;
state->prev.dest_rate = dest_rate;
if (state->state)
state->state = src_delete(state->state);
state->state = src_new(convalgo, channels, &error);
if (!state->state) {
g_set_error(error_r, libsamplerate_quark(), state->error,
"libsamplerate initialization has failed: %s",
src_strerror(error));
return false;
}
data->src_ratio = (double)dest_rate / (double)src_rate;
g_debug("setting samplerate conversion ratio to %.2lf",
data->src_ratio);
src_set_ratio(state->state, data->src_ratio);
return true;
}
