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; }