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| author | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-11-19 15:57:23 +0100 |
|---|---|---|
| committer | Andreas Rheinhardt <andreas.rheinhardt@gmail.com> | 2020-12-08 17:51:47 +0100 |
| commit | d9e6e9360d6b79f4517ec79bcc2d8511cd064e6c (patch) | |
| tree | aaedcf2dcb1384bef6ef488069c06e313cda62a5 /libavcodec/aacdec_template.c | |
| parent | 097277f31aa2f589b5658715683fb0706b1695ad (diff) | |
avcodec/aacdec_template: Use VLC symbols table
Expressions like array[get_vlc2()] can be optimized by using a symbols
table if the array is always the same for a given VLC. This requirement
is fulfilled for several VLCs used by the AAC decoders.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Diffstat (limited to 'libavcodec/aacdec_template.c')
| -rw-r--r-- | libavcodec/aacdec_template.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/libavcodec/aacdec_template.c b/libavcodec/aacdec_template.c index 473a075201..186175e6e6 100644 --- a/libavcodec/aacdec_template.c +++ b/libavcodec/aacdec_template.c @@ -1204,11 +1204,13 @@ static av_cold void aac_static_table_init(void) for (unsigned i = 0, offset = 0; i < 11; i++) { vlc_spectral[i].table = &vlc_buf[offset]; vlc_spectral[i].table_allocated = FF_ARRAY_ELEMS(vlc_buf) - offset; - init_vlc(&vlc_spectral[i], 8, ff_aac_spectral_sizes[i], - ff_aac_spectral_bits[i], sizeof(ff_aac_spectral_bits[i][0]), - sizeof(ff_aac_spectral_bits[i][0]), - ff_aac_spectral_codes[i], sizeof(ff_aac_spectral_codes[i][0]), - sizeof(ff_aac_spectral_codes[i][0]), + ff_init_vlc_sparse(&vlc_spectral[i], 8, ff_aac_spectral_sizes[i], + ff_aac_spectral_bits[i], sizeof(ff_aac_spectral_bits[i][0]), + sizeof(ff_aac_spectral_bits[i][0]), + ff_aac_spectral_codes[i], sizeof(ff_aac_spectral_codes[i][0]), + sizeof(ff_aac_spectral_codes[i][0]), + ff_aac_codebook_vector_idx[i], sizeof(ff_aac_codebook_vector_idx[i][0]), + sizeof(ff_aac_codebook_vector_idx[i][0]), INIT_VLC_STATIC_OVERLONG); offset += vlc_spectral[i].table_size; } @@ -1796,7 +1798,6 @@ static int decode_spectrum_and_dequant(AACContext *ac, INTFLOAT coef[1024], #if !USE_FIXED const float *vq = ff_aac_codebook_vector_vals[cbt_m1]; #endif /* !USE_FIXED */ - const uint16_t *cb_vector_idx = ff_aac_codebook_vector_idx[cbt_m1]; VLC_TYPE (*vlc_tab)[2] = vlc_spectral[cbt_m1].table; OPEN_READER(re, gb); @@ -1812,7 +1813,7 @@ static int decode_spectrum_and_dequant(AACContext *ac, INTFLOAT coef[1024], UPDATE_CACHE(re, gb); GET_VLC(code, re, gb, vlc_tab, 8, 2); - cb_idx = cb_vector_idx[code]; + cb_idx = code; #if USE_FIXED cf = DEC_SQUAD(cf, cb_idx); #else @@ -1835,7 +1836,7 @@ static int decode_spectrum_and_dequant(AACContext *ac, INTFLOAT coef[1024], UPDATE_CACHE(re, gb); GET_VLC(code, re, gb, vlc_tab, 8, 2); - cb_idx = cb_vector_idx[code]; + cb_idx = code; nnz = cb_idx >> 8 & 15; bits = nnz ? GET_CACHE(re, gb) : 0; LAST_SKIP_BITS(re, gb, nnz); @@ -1859,7 +1860,7 @@ static int decode_spectrum_and_dequant(AACContext *ac, INTFLOAT coef[1024], UPDATE_CACHE(re, gb); GET_VLC(code, re, gb, vlc_tab, 8, 2); - cb_idx = cb_vector_idx[code]; + cb_idx = code; #if USE_FIXED cf = DEC_SPAIR(cf, cb_idx); #else @@ -1883,7 +1884,7 @@ static int decode_spectrum_and_dequant(AACContext *ac, INTFLOAT coef[1024], UPDATE_CACHE(re, gb); GET_VLC(code, re, gb, vlc_tab, 8, 2); - cb_idx = cb_vector_idx[code]; + cb_idx = code; nnz = cb_idx >> 8 & 15; sign = nnz ? SHOW_UBITS(re, gb, nnz) << (cb_idx >> 12) : 0; LAST_SKIP_BITS(re, gb, nnz); @@ -1916,14 +1917,14 @@ static int decode_spectrum_and_dequant(AACContext *ac, INTFLOAT coef[1024], UPDATE_CACHE(re, gb); GET_VLC(code, re, gb, vlc_tab, 8, 2); + cb_idx = code; - if (!code) { + if (cb_idx == 0x0000) { *icf++ = 0; *icf++ = 0; continue; } - cb_idx = cb_vector_idx[code]; nnz = cb_idx >> 12; nzt = cb_idx >> 8; bits = SHOW_UBITS(re, gb, nnz) << (32-nnz); |