diff options
Diffstat (limited to 'libavcodec/ac3dec.c')
| -rw-r--r-- | libavcodec/ac3dec.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index 74f34f8e14..ad1bb938f8 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -95,6 +95,18 @@ static const float gain_levels[9] = { }; /** + * Table for center mix levels + * reference: Section 5.4.2.4 cmixlev + */ +static const uint8_t center_levels[4] = { 4, 5, 6, 5 }; + +/** + * Table for surround mix levels + * reference: Section 5.4.2.5 surmixlev + */ +static const uint8_t surround_levels[4] = { 4, 6, 7, 6 }; + +/** * Table for default stereo downmixing coefficients * reference: Section 7.8.2 Downmixing Into Two Channels */ @@ -383,8 +395,8 @@ static int ac3_parse_header(AC3DecodeContext *s) static void set_downmix_coeffs(AC3DecodeContext *s) { int i; - float cmix = gain_levels[s->center_mix_level]; - float smix = gain_levels[s->surround_mix_level]; + float cmix = gain_levels[center_levels[s->center_mix_level]]; + float smix = gain_levels[surround_levels[s->surround_mix_level]]; for(i=0; i<s->fbw_channels; i++) { s->downmix_coeffs[i][0] = gain_levels[ac3_default_coeffs[s->channel_mode][i][0]]; |