RepoMirrors/ffmpeg
1
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-01-19 22:01:00 +00:00
Code Issues Projects Releases Wiki Activity

avcodec/atrac3plus: Combine symbols tables

Browse Source 
This allows to remove lots of pointers (130) to small symbol tables;
it has the downside that some of the default tables must now be coded
explicitly, but this costs only 6 + 4 + 8 + 16 + 8 bytes and is therefore
dwarfed by the gains.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-01 18:52:17 +01:00
parent fd964dad1e
commit 1cf374c973
2 changed files with 759 additions and 805 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
libavcodec/atrac3plus.c
View File

@ -43,11 +43,11 @@ static VLC tone_vlc_tabs[7];
* Generate canonical VLC table from given descriptor.
*
* @param[in] cb ptr to codebook descriptor
* @param[in] xlat ptr to translation table or NULL
* @param[in,out] xlat ptr to ptr to translation table
* @param[in,out] tab_offset starting offset to the generated vlc table
* @param[out] out_vlc ptr to vlc table to be generated
*/
static av_cold void build_canonical_huff(const uint8_t *cb, const uint8_t *xlat,
static av_cold void build_canonical_huff(const uint8_t *cb, const uint8_t **xlat,
int *tab_offset, VLC *out_vlc)
{
int i, b;
@ -68,14 +68,16 @@ static av_cold void build_canonical_huff(const uint8_t *cb, const uint8_t *xlat,
out_vlc->table_allocated = 1 << max_len;
ff_init_vlc_from_lengths(out_vlc, max_len, index, bits, 1,
xlat, 1, 1, 0, INIT_VLC_USE_NEW_STATIC, NULL);
*xlat, 1, 1, 0, INIT_VLC_USE_NEW_STATIC, NULL);
*tab_offset += 1 << max_len;
*xlat += index;
}
av_cold void ff_atrac3p_init_vlcs(void)
{
int i, tab_offset = 0;
const uint8_t *xlats;
static const uint8_t wl_nb_bits[4] = { 2, 3, 5, 5 };
static const uint8_t wl_nb_codes[4] = { 3, 5, 8, 8 };
@ -107,13 +109,6 @@ av_cold void ff_atrac3p_init_vlcs(void)
atrac3p_huff_gain_loc4_cb, atrac3p_huff_gain_loc2_cb,
atrac3p_huff_gain_loc5_cb
};
static const uint8_t * const gain_xlats[11] = {
NULL, atrac3p_huff_gain_npoints2_xlat, atrac3p_huff_gain_lev1_xlat,
atrac3p_huff_gain_lev2_xlat, atrac3p_huff_gain_lev3_xlat,
atrac3p_huff_gain_lev4_xlat, atrac3p_huff_gain_loc3_xlat,
atrac3p_huff_gain_loc1_xlat, atrac3p_huff_gain_loc4_xlat,
atrac3p_huff_gain_loc2_xlat, atrac3p_huff_gain_loc5_xlat
};
static const uint8_t * const tone_cbs[7] = {
atrac3p_huff_tonebands_cb, atrac3p_huff_numwavs1_cb,
@ -121,11 +116,6 @@ av_cold void ff_atrac3p_init_vlcs(void)
atrac3p_huff_wav_ampsf2_cb, atrac3p_huff_wav_ampsf3_cb,
atrac3p_huff_freq_cb
};
static const uint8_t * const tone_xlats[7] = {
NULL, NULL, atrac3p_huff_numwavs2_xlat, atrac3p_huff_wav_ampsf1_xlat,
atrac3p_huff_wav_ampsf2_xlat, atrac3p_huff_wav_ampsf3_xlat,
atrac3p_huff_freq_xlat
};
for (int i = 0; i < 4; i++) {
wl_vlc_tabs[i].table = &tables_data[tab_offset];
@ -156,22 +146,24 @@ av_cold void ff_atrac3p_init_vlcs(void)
}
/* build huffman tables for spectrum decoding */
xlats = atrac3p_spectra_xlats;
for (i = 0; i < 112; i++) {
if (atrac3p_spectra_tabs[i].redirect < 0)
build_canonical_huff(atrac3p_spectra_tabs[i].cb,
atrac3p_spectra_tabs[i].xlat,
&tab_offset, &spec_vlc_tabs[i]);
&xlats, &tab_offset, &spec_vlc_tabs[i]);
else /* Reuse already initialized VLC table */
spec_vlc_tabs[i] = spec_vlc_tabs[atrac3p_spectra_tabs[i].redirect];
}
/* build huffman tables for gain data decoding */
xlats = atrac3p_gain_xlats;
for (i = 0; i < 11; i++)
build_canonical_huff(gain_cbs[i], gain_xlats[i], &tab_offset, &gain_vlc_tabs[i]);
build_canonical_huff(gain_cbs[i], &xlats, &tab_offset, &gain_vlc_tabs[i]);
/* build huffman tables for tone decoding */
xlats = atrac3p_tone_xlats;
for (i = 0; i < 7; i++)
build_canonical_huff(tone_cbs[i], tone_xlats[i], &tab_offset, &tone_vlc_tabs[i]);
build_canonical_huff(tone_cbs[i], &xlats, &tab_offset, &tone_vlc_tabs[i]);
}
/**

1534
libavcodec/atrac3plus_data.h
View File

File diff suppressed because it is too large Load Diff