TEST(ScalingFunctionTest, ScaleLinear) {
EXPECT_EQ( 0, scale_linear( 0, 0.0,10.0, 0.0,100.0));
EXPECT_EQ(100, scale_linear( 10, 0.0,10.0, 0.0,100.0));
EXPECT_EQ( 50, scale_linear( 5, 0.0,10.0, 0.0,100.0));
EXPECT_EQ( 0, scale_linear( -4, 0.0,10.0, 0.0,100.0));
EXPECT_EQ(100, scale_linear( 15, 0.0,10.0, 0.0,100.0));
}
static gint
xmms_mad_read (xmms_xform_t *xform, gpointer buf, gint len, xmms_error_t *err)
{
xmms_mad_data_t *data;
xmms_samples16_t *out = (xmms_samples16_t *)buf;
gint ret;
gint j;
gint read = 0;
data = xmms_xform_private_data_get (xform);
j = 0;
while (read < len) {
/* use already synthetized frame first */
if (data->synthpos < data->synth.pcm.length) {
out[j++] = scale_linear (data->synth.pcm.samples[0][data->synthpos]);
if (data->channels == 2) {
out[j++] = scale_linear (data->synth.pcm.samples[1][data->synthpos]);
read += 2 * xmms_sample_size_get (XMMS_SAMPLE_FORMAT_S16);
} else {
read += xmms_sample_size_get (XMMS_SAMPLE_FORMAT_S16);
}
data->synthpos++;
continue;
}
/* then try to decode another frame */
if (mad_frame_decode (&data->frame, &data->stream) != -1) {
/* mad_synthpop_frame - go Depeche! */
mad_synth_frame (&data->synth, &data->frame);
if (data->frames_to_skip) {
data->frames_to_skip--;
data->synthpos = 0x7fffffff;
} else if (data->samples_to_skip) {
if (data->samples_to_skip > data->synth.pcm.length) {
data->synthpos = 0x7fffffff;
data->samples_to_skip -= data->synth.pcm.length;
} else {
data->synthpos = data->samples_to_skip;
data->samples_to_skip = 0;
}
} else {
if (data->samples_to_play == 0) {
return read;
} else if (data->samples_to_play > 0) {
if (data->synth.pcm.length > data->samples_to_play) {
data->synth.pcm.length = data->samples_to_play;
}
data->samples_to_play -= data->synth.pcm.length;
}
data->synthpos = 0;
}
continue;
}
/* if there is no frame to decode stream more data */
if (data->stream.next_frame) {
guchar *buffer = data->buffer;
const guchar *nf = data->stream.next_frame;
memmove (data->buffer, data->stream.next_frame,
data->buffer_length = (&buffer[data->buffer_length] - nf));
}
ret = xmms_xform_read (xform,
(gchar *)data->buffer + data->buffer_length,
4096 - data->buffer_length,
err);
if (ret <= 0) {
return ret;
}
data->buffer_length += ret;
mad_stream_buffer (&data->stream, data->buffer, data->buffer_length);
}
return read;
}
