/** \file resample_filter.c A sample rate converter based on libsamplerate. */
#include <regex.h>
+#include <samplerate.h>
#include "resample_filter.cmdline.h"
#include "para.h"
#include "buffer_tree.h"
#include "filter.h"
#include "string.h"
+#include "check_wav.h"
+
+struct resample_context {
+ int channels;
+ int source_sample_rate;
+ float ratio;
+ SRC_STATE *src_state;
+ struct check_wav_context *cwc;
+};
+
+static int resample_execute(struct btr_node *btrn, const char *cmd, char **result)
+{
+ struct filter_node *fn = btr_context(btrn);
+ struct resample_context *ctx = fn->private_data;
+ struct resample_filter_args_info *conf = fn->conf;
+
+ return decoder_execute(cmd, conf->dest_sample_rate_arg, ctx->channels,
+ result);
+}
static void resample_close(struct filter_node *fn)
{
- free(fn->private_data);
+ struct resample_context *ctx = fn->private_data;
+
+ if (!ctx)
+ return;
+ check_wav_shutdown(ctx->cwc);
+ if (ctx->src_state)
+ src_delete(ctx->src_state);
+ free(ctx);
fn->private_data = NULL;
}
static void resample_open(struct filter_node *fn)
{
+ struct resample_context *ctx = para_calloc(sizeof(*ctx));
+ struct resample_filter_args_info *conf = fn->conf;
+ struct btr_node *btrn = fn->btrn;
+ struct wav_params wp;
+
+ fn->private_data = ctx;
+ fn->min_iqs = 2;
+ COPY_WAV_PARMS(&wp, conf);
+ ctx->cwc = check_wav_init(btr_parent(btrn), btrn, &wp, NULL);
+ btr_log_tree(btr_parent(btr_parent(btrn)), LL_INFO);
}
static void resample_pre_select(struct sched *s, struct task *t)
{
struct filter_node *fn = container_of(t, struct filter_node, task);
+ struct resample_context *ctx = fn->private_data;
+ int ret = btr_node_status(fn->btrn, fn->min_iqs, BTR_NT_INTERNAL);
+
+ if (ret != 0)
+ return sched_min_delay(s);
+ check_wav_pre_select(s, ctx->cwc);
+}
+
+static int get_btr_val(const char *what, struct btr_node *btrn)
+{
+ char *buf;
+ int32_t val;
+ int ret = btr_exec_up(btr_parent(btrn), what, &buf);
+
+ if (ret < 0) {
+ PARA_NOTICE_LOG("btr exec for \"%s\" failed\n", what);
+ return ret;
+ }
+ ret = para_atoi32(buf, &val);
+ free(buf);
+ return ret < 0? ret : val;
+}
+
+static int resample_set_params(struct filter_node *fn)
+{
+ int ret;
+ struct resample_context *ctx = fn->private_data;
+ struct resample_filter_args_info *conf = fn->conf;
+ struct btr_node *btrn = fn->btrn;
+
+ ctx->channels = conf->channels_arg;
+ if (!conf->channels_given) {
+ ret = get_btr_val("channels", btrn);
+ if (ret >= 0)
+ ctx->channels = ret;
+ }
+
+ ctx->source_sample_rate = conf->sample_rate_arg;
+ if (!conf->sample_rate_given) {
+ ret = get_btr_val("sample_rate", btrn);
+ if (ret >= 0)
+ ctx->source_sample_rate = ret;
+ }
+ /* reject all sample formats except 16 bit signed, little endian */
+ ret = get_btr_val("sample_format", btrn);
+ if (ret >= 0 && ret != SF_S16_LE) {
+ const char *sample_formats[] = {SAMPLE_FORMATS};
+ PARA_ERROR_LOG("unsupported sample format: %s\n",
+ sample_formats[ret]);
+ return -ERRNO_TO_PARA_ERROR(EINVAL);
+ }
+ ctx->ratio = (float)conf->dest_sample_rate_arg / ctx->source_sample_rate;
+ return 1;
+}
+
+static int resample_init(struct filter_node *fn)
+{
+ int ret, converter;
+ struct resample_context *ctx = fn->private_data;
+ struct resample_filter_args_info *conf = fn->conf;
+ struct btr_node *btrn = fn->btrn;
+
+ ret = -E_RESAMPLE_EOF;
+ if (btr_no_parent(btrn))
+ return ret;
+ if (btr_get_input_queue_size(btrn) == 0)
+ return 0;
+ ret = resample_set_params(fn);
+ if (ret < 0)
+ return ret;
+ switch (conf->converter_arg) {
+ case converter_arg_best:
+ converter = SRC_SINC_BEST_QUALITY;
+ break;
+ case converter_arg_medium:
+ converter = SRC_SINC_MEDIUM_QUALITY;
+ break;
+ case converter_arg_fastest:
+ converter = SRC_SINC_FASTEST;
+ break;
+ case converter_arg_zero_order_hold:
+ converter = SRC_ZERO_ORDER_HOLD;
+ break;
+ case converter_arg_linear:
+ converter = SRC_LINEAR;
+ break;
+ default:
+ assert(0);
+ }
+ ctx->src_state = src_new(converter, conf->channels_arg, &ret);
+ if (!ctx->src_state) {
+ PARA_ERROR_LOG("%s\n", src_strerror(ret));
+ return -E_LIBSAMPLERATE;
+ }
+ fn->min_iqs = 2 * ctx->channels;
+ return 1;
+}
+
+/* returns number of input frames used */
+static int resample_frames(int16_t *in, size_t num_frames, bool have_more,
+ struct resample_context *ctx, int16_t **result,
+ size_t *result_frames)
+{
+ int ret, num_samples, out_samples;
+ int16_t *out;
+ SRC_DATA data;
+
+ data.src_ratio = ctx->ratio;
+ data.end_of_input = !have_more;
+
+ data.input_frames = num_frames;
+ num_samples = num_frames * ctx->channels;
+ data.output_frames = num_frames * ctx->ratio + 1;
+ out_samples = data.output_frames * ctx->channels;
+
+ data.data_in = para_malloc(num_samples * sizeof(float));
+ src_short_to_float_array(in, data.data_in, num_samples);
+ data.data_out = para_malloc(out_samples * sizeof(float));
+ ret = src_process(ctx->src_state, &data);
+ free(data.data_in);
+ if (ret != 0) {
+ PARA_ERROR_LOG("%s\n", src_strerror(ret));
+ free(data.data_out);
+ return -E_LIBSAMPLERATE;
+ }
+ out_samples = data.output_frames_gen * ctx->channels;
+ out = para_malloc(out_samples * sizeof(short));
+ src_float_to_short_array(data.data_out, out, out_samples);
+ free(data.data_out);
+ *result = out;
+ *result_frames = data.output_frames_gen;
+ return data.input_frames_used;
}
static void resample_post_select(__a_unused struct sched *s, struct task *t)
{
+ int ret;
struct filter_node *fn = container_of(t, struct filter_node, task);
+ struct resample_context *ctx = fn->private_data;
+ struct resample_filter_args_info *conf = fn->conf;
+ struct btr_node *btrn = fn->btrn;
+ int16_t *in, *out;
+ size_t in_bytes, num_frames;
+ bool have_more;
+
+ ret = check_wav_post_select(ctx->cwc);
+ if (ret < 0)
+ goto out;
+ if (!ctx->src_state) {
+ ret = resample_init(fn);
+ if (ret <= 0)
+ goto out;
+ }
+ ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
+ if (ret <= 0)
+ goto out;
+ if (ctx->source_sample_rate == conf->dest_sample_rate_arg) {
+ /*
+ * No resampling necessary. We do not splice ourselves out
+ * though, since our children might want to ask us through the
+ * btr exec mechanism for the destination samplerate and the
+ * channel count.
+ */
+ return btr_pushdown(btrn);
+ }
+ btr_merge(btrn, fn->min_iqs);
+ in_bytes = btr_next_buffer(btrn, (char **)&in);
+ ret = -E_RESAMPLE_EOF;
+ num_frames = in_bytes / 2 / ctx->channels;
+ if (num_frames == 0)
+ goto out;
+ have_more = !btr_no_parent(btrn) ||
+ btr_next_buffer_omit(btrn, in_bytes, NULL) > 0;
+ ret = resample_frames(in, num_frames, have_more, ctx, &out, &num_frames);
+ if (ret < 0)
+ goto out;
+ btr_consume(btrn, ret * 2 * ctx->channels);
+ btr_add_output((char *)out, num_frames * 2 * ctx->channels, btrn);
+ return;
+out:
+ if (ret < 0) {
+ t->error = ret;
+ btr_remove_node(&fn->btrn);
+ /* This releases the check_wav btr node */
+ check_wav_post_select(ctx->cwc);
+ }
}
static int resample_parse_config(int argc, char **argv, void **config)
{
- return 0;
+ int ret, val, given;
+ struct resample_filter_args_info *conf = para_calloc(sizeof(*conf));
+
+ resample_filter_cmdline_parser(argc, argv, conf);
+
+ /* sanity checks */
+ ret = -ERRNO_TO_PARA_ERROR(EINVAL);
+ val = conf->channels_arg;
+ given = conf->channels_given;
+ if (val < 0 || (val == 0 && given))
+ goto err;
+ val = conf->sample_rate_arg;
+ given = conf->sample_rate_given;
+ if (val < 0 || (val == 0 && given))
+ goto err;
+ val = conf->dest_sample_rate_arg;
+ given = conf->dest_sample_rate_given;
+ if (val < 0 || (val == 0 && given))
+ goto err;
+ *config = conf;
+ return 1;
+err:
+ free(conf);
+ return ret;
}
static void resample_free_config(void *conf)
{
+ if (!conf)
+ return;
resample_filter_cmdline_parser_free(conf);
+ free(conf);
}
/**
f->post_select = resample_post_select;
f->parse_config = resample_parse_config;
f->free_config = resample_free_config;
+ f->execute = resample_execute;
f->help = (struct ggo_help) {
.short_help = resample_filter_args_info_help,
.detailed_help = resample_filter_args_info_detailed_help
projects / paraslash.git / commitdiff