From 4da7111eb8382c9fa5b464c0a62d12d497f7018a Mon Sep 17 00:00:00 2001 From: Benoit Fouet Date: Mon, 13 Oct 2014 14:42:55 +0200 Subject: [PATCH] avcodec/aacdec: map LFE[0] to SCE[1] for 4.0 audio. Fixes ticket #3930 Signed-off-by: Michael Niedermayer --- libavcodec/aacdec.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/libavcodec/aacdec.c b/libavcodec/aacdec.c index 10c509be82..ef820d261f 100644 --- a/libavcodec/aacdec.c +++ b/libavcodec/aacdec.c @@ -630,6 +630,16 @@ static ChannelElement *get_che(AACContext *ac, int type, int elem_id) return ac->tag_che_map[TYPE_CPE][elem_id] = ac->che[TYPE_CPE][1]; } case 4: + /* Some streams incorrectly code 4.0 audio as + * SCE[0] CPE[0] LFE[0] + * instead of + * SCE[0] CPE[0] SCE[1]. + * If we seem to have encountered such a stream, transfer + * the SCE[1] element to the LFE[0]'s mapping */ + if (ac->tags_mapped == tags_per_config[ac->oc[1].m4ac.chan_config] - 1 && (type == TYPE_LFE || type == TYPE_SCE)) { + ac->tags_mapped++; + return ac->tag_che_map[type][elem_id] = ac->che[TYPE_SCE][1]; + } if (ac->tags_mapped == 2 && ac->oc[1].m4ac.chan_config == 4 && type == TYPE_SCE) {