From a672ab5e737202bede956a88357a96cf2728df15 Mon Sep 17 00:00:00 2001
From: Joerg Mueller <nexyon@gmail.com>
Date: Tue, 9 Aug 2011 14:10:32 +0000
Subject: 3D Audio GSoC: Improved waveform drawing in the sequencer.

* Drawing the waveform of a sequencer strip is now independent from whether the sound is cached or not.
* Improved drawing of the waveform in the sequencer (especially speed!).
* Making it possible to vertically zoom more in the sequencer to better see the waveform for lipsync.
* Fixed a bug which crashed blender on loading a sound file via ffmpeg.
---
 .../editors/space_sequencer/sequencer_draw.c       | 61 +++++++++++++++++-----
 .../editors/space_sequencer/space_sequencer.c      |  2 +-
 2 files changed, 48 insertions(+), 15 deletions(-)

(limited to 'source/blender/editors/space_sequencer')

diff --git a/source/blender/editors/space_sequencer/sequencer_draw.c b/source/blender/editors/space_sequencer/sequencer_draw.c
index 7e4207c75fe..bc97ff341db 100644
--- a/source/blender/editors/space_sequencer/sequencer_draw.c
+++ b/source/blender/editors/space_sequencer/sequencer_draw.c
@@ -173,30 +173,63 @@ static void drawseqwave(Scene *scene, Sequence *seq, float x1, float y1, float x
 	x2 the end x value, same for y1 and y2
 	stepsize is width of a pixel.
 	*/
-	if(seq->sound->cache)
+	if(seq->flag & SEQ_AUDIO_DRAW_WAVEFORM)
 	{
-		int i;
+		int i, j, pos;
 		int length = floor((x2-x1)/stepsize)+1;
 		float ymid = (y1+y2)/2;
 		float yscale = (y2-y1)/2;
-		float* samples = MEM_mallocN(length * sizeof(float) * 2, "seqwave_samples");
-		if(!samples)
-			return;
-		if(sound_read_sound_buffer(seq->sound, samples, length,
-								   (seq->startofs + seq->anim_startofs)/FPS,
-								   (seq->startofs + seq->anim_startofs + seq->enddisp - seq->startdisp)/FPS) != length)
+		float samplestep;
+		float startsample, endsample;
+		float value;
+
+		SoundWaveform* waveform;
+
+		if(!seq->sound->waveform)
+			sound_read_waveform(seq->sound);
+
+		waveform = seq->sound->waveform;
+
+		startsample = floor((seq->startofs + seq->anim_startofs)/FPS * SOUND_WAVE_SAMPLES_PER_SECOND);
+		endsample = ceil((seq->startofs + seq->anim_startofs + seq->enddisp - seq->startdisp)/FPS * SOUND_WAVE_SAMPLES_PER_SECOND);
+		samplestep = (endsample-startsample) * stepsize / (x2-x1);
+
+		if(length > floor((waveform->length - startsample) / samplestep))
+			length = floor((waveform->length - startsample) / samplestep);
+
+		glBegin(GL_LINE_STRIP);
+		for(i = 0; i < length; i++)
 		{
-			MEM_freeN(samples);
-			return;
+			pos = startsample + i * samplestep;
+
+			value = waveform->data[pos * 3];
+
+			for(j = pos+1; (j < waveform->length) && (j < pos + samplestep); j++)
+			{
+				if(value > waveform->data[j * 3])
+					value = waveform->data[j * 3];
+			}
+
+			glVertex2f(x1+i*stepsize, ymid + value * yscale);
 		}
-		glBegin(GL_LINES);
+		glEnd();
+
+		glBegin(GL_LINE_STRIP);
 		for(i = 0; i < length; i++)
 		{
-			glVertex2f(x1+i*stepsize, ymid + samples[i * 2] * yscale);
-			glVertex2f(x1+i*stepsize, ymid + samples[i * 2 + 1] * yscale);
+			pos = startsample + i * samplestep;
+
+			value = waveform->data[pos * 3 + 1];
+
+			for(j = pos+1; (j < waveform->length) && (j < pos + samplestep); j++)
+			{
+				if(value < waveform->data[j * 3 + 1])
+					value = waveform->data[j * 3 + 1];
+			}
+
+			glVertex2f(x1+i*stepsize, ymid + value * yscale);
 		}
 		glEnd();
-		MEM_freeN(samples);
 	}
 }
 
diff --git a/source/blender/editors/space_sequencer/space_sequencer.c b/source/blender/editors/space_sequencer/space_sequencer.c
index d1df9699fa3..36471c7ffcf 100644
--- a/source/blender/editors/space_sequencer/space_sequencer.c
+++ b/source/blender/editors/space_sequencer/space_sequencer.c
@@ -223,7 +223,7 @@ static SpaceLink *sequencer_new(const bContext *C)
 	ar->v2d.cur= ar->v2d.tot;
 	
 	ar->v2d.min[0]= 10.0f;
-	ar->v2d.min[1]= 4.0f;
+	ar->v2d.min[1]= 0.5f;
 	
 	ar->v2d.max[0]= MAXFRAMEF;
 	ar->v2d.max[1]= MAXSEQ;
-- 
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