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ac3enc: reorder input channels to AC-3 channel order

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Originally committed as revision 18540 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Justin Ruggles
2009-04-17 08:39:11 +00:00
parent 35e2e681b8
commit a7c6e1171b
3 changed files with 22 additions and 3 deletions
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15
libavcodec/ac3tab.c
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@ -79,6 +79,21 @@ const uint8_t ff_ac3_channels_tab[8] = {
2, 1, 2, 3, 3, 4, 4, 5
};
/**
* Table to remap channels from SMPTE order to AC-3 order.
* [channel_mode][lfe][ch]
*/
const uint8_t ff_ac3_enc_channel_map[8][2][6] = {
{ { 0, 1, }, { 0, 1, 2, } },
{ { 0, }, { 0, 1, } },
{ { 0, 1, }, { 0, 1, 2, } },
{ { 0, 2, 1, }, { 0, 2, 1, 3, } },
{ { 0, 1, 2, }, { 0, 1, 3, 2, } },
{ { 0, 2, 1, 3, }, { 0, 2, 1, 4, 3, } },
{ { 0, 1, 2, 3, 4, }, { 0, 1, 3, 4, 2, } },
{ { 0, 2, 1, 3, 4, }, { 0, 2, 1, 4, 5, 3 } },
};
/* possible frequencies */
const uint16_t ff_ac3_sample_rate_tab[3] = { 48000, 44100, 32000 };