Fix for a problem with inverted sign of output data from ffvorbis decoder.

Now the sign of audio samples in ffvorbis output is the same as in original
uncompressed audio file and this also allows the use of tiny_psnr to compare
ffvorbis with libvorbis/tremor.

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18878 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

diff --git a/libavcodec/vorbis_dec.c b/libavcodec/vorbis_dec.c
index f7b10e61b372746932fb789c647503cd09da9a37..827619efa060814fce8a0bf6df6320f1a00e3450 100644 (file)
--- a/libavcodec/vorbis_dec.c
+++ b/libavcodec/vorbis_dec.c
@@ -896,8 +896,8 @@ static int vorbis_parse_id_hdr(vorbis_context *vc){
     vc->saved           = av_mallocz((vc->blocksize[1]/4)*vc->audio_channels * sizeof(float));
     vc->previous_window=0;
 
-    ff_mdct_init(&vc->mdct[0], bl0, 1, 1.0);
-    ff_mdct_init(&vc->mdct[1], bl1, 1, 1.0);
+    ff_mdct_init(&vc->mdct[0], bl0, 1, -1.0);
+    ff_mdct_init(&vc->mdct[1], bl1, 1, -1.0);
 
     AV_DEBUG(" vorbis version %d \n audio_channels %d \n audio_samplerate %d \n bitrate_max %d \n bitrate_nom %d \n bitrate_min %d \n blk_0 %d blk_1 %d \n ",
             vc->version, vc->audio_channels, vc->audio_samplerate, vc->bitrate_maximum, vc->bitrate_nominal, vc->bitrate_minimum, vc->blocksize[0], vc->blocksize[1]);