Function loadfile

libsigrok4DSL/input/in_wav.c:131–201

}

static int loadfile(struct sr_input *in, const char *filename)
{
	struct sr_datafeed_packet packet;
	struct sr_datafeed_meta meta;
	struct sr_datafeed_analog analog;
	struct sr_config *src;
	struct context *ctx;
	float fdata[CHUNK_SIZE];
	uint64_t sample;
	int num_samples, chunk_samples, s, c, fd, l;
	char buf[CHUNK_SIZE];

	ctx = in->sdi->priv;
    packet.status = SR_PKT_OK;

	/* Send header packet to the session bus. */
	std_session_send_df_header(in->sdi, LOG_PREFIX);

	packet.type = SR_DF_META;
	packet.payload = &meta;
	src = sr_config_new(SR_CONF_SAMPLERATE,
			g_variant_new_uint64(ctx->samplerate));
	meta.config = g_slist_append(NULL, src);
	ds_data_forward(in->sdi, &packet);
	sr_config_free(src);

	if ((fd = open(filename, O_RDONLY)) == -1)
		return SR_ERR;

	lseek(fd, 40, SEEK_SET);
	l = read(fd, buf, 4);
	num_samples = GUINT32_FROM_LE((uint32_t)*(buf));
	num_samples /= ctx->samplesize / ctx->num_channels;
	while (TRUE) {
		if ((l = read(fd, buf, CHUNK_SIZE)) < 1)
			break;
		chunk_samples = l / ctx->samplesize / ctx->num_channels;
		for (s = 0; s < chunk_samples; s++) {
			for (c = 0; c < ctx->num_channels; c++) {
				sample = 0;
				memcpy(&sample, buf + s * ctx->samplesize + c, ctx->samplesize);
				switch (ctx->samplesize) {
				case 1:
					/* 8-bit PCM samples are unsigned. */
					fdata[s + c] = (uint8_t)sample / 255.0;
					break;
				case 2:
					fdata[s + c] = GINT16_FROM_LE(sample) / 32767.0;
					break;
				case 4:
					fdata[s + c] = GINT32_FROM_LE(sample) / 65535.0;
					break;
				}
			}
		}
		packet.type = SR_DF_ANALOG;
		packet.payload = &analog;
		analog.probes = in->sdi->channels;