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ADPCM IMA WAV 2, 3 and 5 bits decoder

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
2012-12-01 14:52:22 +00:00
parent 48f2750de8
commit 6516a25f04
4 changed files with 77 additions and 7 deletions
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23
libavcodec/adpcm_data.c
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@@ -27,12 +27,33 @@
/* ff_adpcm_step_table[] and ff_adpcm_index_table[] are from the ADPCM
reference source */
/* This is the index table: */
static const int8_t adpcm_index_table2[4] = {
-1, 2,
-1, 2,
};
static const int8_t adpcm_index_table3[8] = {
-1, -1, 1, 2,
-1, -1, 1, 2,
};
const int8_t ff_adpcm_index_table[16] = {
-1, -1, -1, -1, 2, 4, 6, 8,
-1, -1, -1, -1, 2, 4, 6, 8,
};
static const int8_t adpcm_index_table5[32] = {
-1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
-1, -1, -1, -1, -1, -1, -1, -1, 1, 2, 4, 6, 8, 10, 13, 16,
};
const int8_t const *ff_adpcm_index_tables[4] = {
&adpcm_index_table2[0],
&adpcm_index_table3[0],
&ff_adpcm_index_table[0],
&adpcm_index_table5[0],
};
/**
* This is the step table. Note that many programs use slight deviations from
* this table, but such deviations are negligible: