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Fixed a bug where the start of the wave was not drawn, also added verbose commenting and cleaned up the wave allignment.

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Campbell Barton
2006-06-15 01:19:10 +00:00
parent 06ee80635c
commit d0fb19bbe5
1 changed files with 59 additions and 45 deletions
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104
source/blender/src/drawseq.c
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@@ -249,16 +249,42 @@ static void drawmeta_contents(Sequence *seqm, float x1, float y1, float x2, floa
static void drawseqwave(Sequence *seq, float x1, float y1, float x2, float y2, int winx)
{
float f, height, midy, clipxmin, clipxmax, sample_step;
int offset, offset_next, sofs, eofs, i=0;
/*
x1 is the starting x value to draw the wave,
x2 the end x value, same for y1 and y2
winx is the zoom level.
*/
float
f, /* floating point value used to store the X draw location for the wave lines when openGL drawing*/
midy, /* fast access to the middle location (y1+y2)/2 */
clipxmin, /* the minimum X value, clip this with the window */
clipxmax, /* the maximum X value, clip this with the window */
sample_step, /* steps to move per sample, floating value must later translate into an int */
fsofs, /* steps to move per sample, floating value must later translate into an int */
feofs_sofs, /* */
sound_width, /* convenience: x2-x1 */
wavemulti; /* scale the samples by this value when GL_LINE drawing so it renders the right height */
int
offset, /* initial offset value for the wave drawing */
offset_next, /* when in the wave drawing loop this value is the samples intil the next vert */
sofs, /* Constrained offset value (~3) for the wave, start */
eofs, /* ditto, end */
wavesample, /* inner loop storage if the current wave sample value, used to make the 2 values below */
wavesamplemin, /* used for finding the min and max wave peaks */
wavesamplemax, /* ditto */
subsample_step=4; /* when the sample step is 4 every sample of
the wave is evaluated for min and max values used to draw the wave,
however this is slow ehrn zoomed out so when the sample step is above
1 (the larger the further out the zoom is) so not evaluate all samples, only some. */
signed short* s;
bSound *sound;
int wavesample, wavesamplemin, wavesamplemax, subsample_step=4; /* used for finding the min and max wave peaks */
Uint8 *stream;
float fsofs, feofs_sofs, sound_width, wavemulti; /* for faster access in the loop */
audio_makestream(seq->sound);
if(seq->sound==NULL || seq->sound->stream==NULL) return;
if(seq->sound==NULL || seq->sound->stream==NULL) return;
if (seq->flag & SEQ_MUTE) glColor3ub(0x70, 0x80, 0x80); else glColor3ub(0x70, 0xc0, 0xc0);
@@ -266,24 +292,10 @@ static void drawseqwave(Sequence *seq, float x1, float y1, float x2, float y2, i
eofs = ((int)( (((float)(seq->enddisp-seq->start))/(float)G.scene->r.frs_sec)*(float)G.scene->audio.mixrate*4.0 )) & (~3);
/* clip the drawing area to the screen bounds to save time */
sample_step= (G.v2d->cur.xmax-G.v2d->cur.xmin)/winx;
sample_step= (G.v2d->cur.xmax - G.v2d->cur.xmin)/winx;
clipxmin= MAX2(x1, G.v2d->cur.xmin);
clipxmax= MIN2(x2, G.v2d->cur.xmax);
/* Stops dithering on redraw when clipxmin is offset. */
if (clipxmin != x1) {
clipxmin = (float) ((int)((clipxmin*sample_step)+(i*sample_step))) / sample_step;
while (clipxmin < x1) {
clipxmin = (float) ((int)((clipxmin*sample_step)+(i*sample_step))) / sample_step;
i+=1;
}
clipxmin = (float)((int)clipxmin); /* snap to int */
}
/* when the sample step is 4 every sample of the wave is evaluated for min and max
values used to draw the wave, however this is slow ehrn zoomed out
so when the sample step is above 1 (the larger the further out the zoom is)
so not evaluate all samples, only some.*/
if (sample_step > 1)
subsample_step= ((int)(subsample_step*sample_step*8)) & (~3);
@@ -292,44 +304,46 @@ static void drawseqwave(Sequence *seq, float x1, float y1, float x2, float y2, i
fsofs= (float)sofs;
feofs_sofs= (float)(eofs-sofs);
sound_width= x2-x1;
height= y2-y1;
sound = seq->sound;
stream = sound->stream;
wavemulti = height/196605;
wavemulti = (y2-y1)/196605; /*y2-y1 is the height*/
wavesample=0;
/* we need to get the starting offset value, excuse the duplicate code */
f=clipxmin;
offset = (int) (fsofs + ((f-x1)/sound_width) * feofs_sofs) & (~3);
offset= (int) (fsofs + ((f-x1)/sound_width) * feofs_sofs) & (~3);
/* start the loop, draw a line per sample_step -sample_step is about 1 line drawn per pixel */
glBegin(GL_LINES);
for (f=clipxmin+sample_step; f<=clipxmax; f+=sample_step) {
for (f=x1+sample_step; f<=clipxmax; f+=sample_step) {
offset_next = (int) (fsofs + ((f-x1)/sound_width) * feofs_sofs) & (~3);
/* if this is close to the last sample just exit */
if (offset_next >= sound->streamlen) break;
wavesamplemin = 131070;
wavesamplemax = -131070;
/*find with high and low of the waveform for this draw,
evaluate small samples to find this range */
while (offset < offset_next) {
s = (signed short*)(stream+offset);
if (f > G.v2d->cur.xmin) {
/* if this is close to the last sample just exit */
if (offset_next >= sound->streamlen) break;
wavesample = s[0]*2 + s[1];
if (wavesamplemin>wavesample)
wavesamplemin=wavesample;
if (wavesamplemax<wavesample)
wavesamplemax=wavesample;
offset+=subsample_step;
wavesamplemin = 131070;
wavesamplemax = -131070;
/*find with high and low of the waveform for this draw,
evaluate small samples to find this range */
while (offset < offset_next) {
s = (signed short*)(stream+offset);
wavesample = s[0]*2 + s[1];
if (wavesamplemin>wavesample)
wavesamplemin=wavesample;
if (wavesamplemax<wavesample)
wavesamplemax=wavesample;
offset+=subsample_step;
}
/* draw the wave line, looks good up close and zoomed out */
glVertex2f(f, midy-(wavemulti*wavesamplemin) );
glVertex2f(f, midy-(wavemulti*wavesamplemax) );
} else {
while (offset < offset_next) offset+=subsample_step;
}
/* draw the wave line, looks good up close and zoomed out */
glVertex2f(f, midy-(wavemulti*wavesamplemin) );
glVertex2f(f, midy-(wavemulti*wavesamplemax) );
offset=offset_next;
}
glEnd();