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Bug 1248861: P11. Fix current downmixer. r=rillian 

Current downmixer was using vorbis channel order (which isn't surprising as it was extracted from the Ogg reader).
Make it use SMPTE order as that's now what all MediaDataDecoder output.

MozReview-Commit-ID: 5Kf7UnC52wL
This commit is contained in:
Jean-Yves Avenard 2016-04-06 14:52:49 +10:00
Родитель 068fa1acef
Коммит a4ef09413b
1 изменённых файлов: 11 добавлений и 11 удалений
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22
dom/media/VideoUtils.cpp
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@ -148,12 +148,12 @@ int DownmixAudioToStereo(mozilla::AudioDataValue* buffer,
#ifdef MOZ_SAMPLE_TYPE_FLOAT32
// Downmix matrix. Per-row normalization 1 for rows 3,4 and 2 for rows 5-8.
static const float dmatrix[6][8][2]= {
/*3*/{{0.5858f,0},{0.4142f,0.4142f},{0, 0.5858f}},
/*4*/{{0.4226f,0},{0, 0.4226f},{0.366f,0.2114f},{0.2114f,0.366f}},
/*5*/{{0.6510f,0},{0.4600f,0.4600f},{0, 0.6510f},{0.5636f,0.3254f},{0.3254f,0.5636f}},
/*6*/{{0.5290f,0},{0.3741f,0.3741f},{0, 0.5290f},{0.4582f,0.2645f},{0.2645f,0.4582f},{0.3741f,0.3741f}},
/*7*/{{0.4553f,0},{0.3220f,0.3220f},{0, 0.4553f},{0.3943f,0.2277f},{0.2277f,0.3943f},{0.2788f,0.2788f},{0.3220f,0.3220f}},
/*8*/{{0.3886f,0},{0.2748f,0.2748f},{0, 0.3886f},{0.3366f,0.1943f},{0.1943f,0.3366f},{0.3366f,0.1943f},{0.1943f,0.3366f},{0.2748f,0.2748f}},
/*3*/{{0.5858f,0},{0,0.5858f},{0.4142f,0.4142f}},
/*4*/{{0.4226f,0},{0,0.4226f},{0.366f, 0.2114f},{0.2114f,0.366f}},
/*5*/{{0.6510f,0},{0,0.6510f},{0.4600f,0.4600f},{0.5636f,0.3254f},{0.3254f,0.5636f}},
/*6*/{{0.5290f,0},{0,0.5290f},{0.3741f,0.3741f},{0.3741f,0.3741f},{0.4582f,0.2645f},{0.2645f,0.4582f}},
/*7*/{{0.4553f,0},{0,0.4553f},{0.3220f,0.3220f},{0.3220f,0.3220f},{0.2788f,0.2788f},{0.3943f,0.2277f},{0.2277f,0.3943f}},
/*8*/{{0.3886f,0},{0,0.3886f},{0.2748f,0.2748f},{0.2748f,0.2748f},{0.3366f,0.1943f},{0.1943f,0.3366f},{0.3366f,0.1943f},{0.1943f,0.3366f}},
};
// Re-write the buffer with downmixed data
for (uint32_t i = 0; i < frames; i++) {
@ -170,12 +170,12 @@ int DownmixAudioToStereo(mozilla::AudioDataValue* buffer,
// Downmix matrix. Per-row normalization 1 for rows 3,4 and 2 for rows 5-8.
// Coefficients in Q14.
static const int16_t dmatrix[6][8][2]= {
/*3*/{{9598, 0},{6786,6786},{0, 9598}},
/*3*/{{9598, 0},{0, 9598},{6786,6786}},
/*4*/{{6925, 0},{0, 6925},{5997,3462},{3462,5997}},
/*5*/{{10663,0},{7540,7540},{0, 10663},{9234,5331},{5331,9234}},
/*6*/{{8668, 0},{6129,6129},{0, 8668},{7507,4335},{4335,7507},{6129,6129}},
/*7*/{{7459, 0},{5275,5275},{0, 7459},{6460,3731},{3731,6460},{4568,4568},{5275,5275}},
/*8*/{{6368, 0},{4502,4502},{0, 6368},{5514,3184},{3184,5514},{5514,3184},{3184,5514},{4502,4502}}
/*5*/{{10663,0},{0, 10663},{7540,7540},{9234,5331},{5331,9234}},
/*6*/{{8668, 0},{0, 8668},{6129,6129},{6129,6129},{7507,4335},{4335,7507}},
/*7*/{{7459, 0},{0, 7459},{5275,5275},{5275,5275},{4568,4568},{6460,3731},{3731,6460}},
/*8*/{{6368, 0},{0, 6368},{4502,4502},{4502,4502},{5514,3184},{3184,5514},{5514,3184},{3184,5514}}
};
// Re-write the buffer with downmixed data
for (uint32_t i = 0; i < frames; i++) {