[Bf-blender-cvs] [8af8bab] master: Fix T45726: Wrong handling of 'failed to generate' audio waveform data in VSE strip draw code.

[Bastien Montagne]

Commit: 8af8bab0c5acc1cf59c507f28cf5c349782932e6
Author: Bastien Montagne
Date:   Fri Aug 7 23:42:32 2015 +0200
Branches: master
https://developer.blender.org/rB8af8bab0c5acc1cf59c507f28cf5c349782932e6

Fix T45726: Wrong handling of 'failed to generate' audio waveform data in VSE strip draw code.

===================================================================

M	source/blender/editors/space_sequencer/sequencer_draw.c

===================================================================

diff --git a/source/blender/editors/space_sequencer/sequencer_draw.c b/source/blender/editors/space_sequencer/sequencer_draw.c
index 7aa6550..afa5987 100644
--- a/source/blender/editors/space_sequencer/sequencer_draw.c
+++ b/source/blender/editors/space_sequencer/sequencer_draw.c
@@ -224,7 +224,13 @@ static void drawseqwave(const bContext *C, SpaceSeq *sseq, Scene *scene, Sequenc
 		BLI_spin_unlock(sound->spinlock);
 		
 		waveform = seq->sound->waveform;
-		
+
+		if (waveform->length == 0) {
+			/* BKE_sound_read_waveform() set an empty SoundWaveform data in case it cannot generate a valid one...
+			 * See T45726. */
+			return;
+		}
+
 		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);