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avcodec/mpc7: Avoid superfluous VLC structures 

Of all these VLCs here, only VLC.table was really used
after init, so use the ff_vlc_init_tables API
to get rid of them.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2023-09-20 22:09:22 +02:00
parent e5e05fd3c8
commit 886fbec82f
1 changed files with 27 additions and 25 deletions
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52
libavcodec/mpc7.c
View File

@ -40,33 +40,34 @@
#include "mpc.h"
#include "mpc7data.h"
static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
static VLCElem scfi_vlc[1 << MPC7_SCFI_BITS];
static VLCElem dscf_vlc[1 << MPC7_DSCF_BITS];
static VLCElem hdr_vlc [1 << MPC7_HDR_BITS];
static const VLCElem *quant_vlc[MPC7_QUANT_VLC_TABLES][2];
static av_cold void mpc7_init_static(void)
{
static VLCElem quant_tables[7224];
VLCInitState state = VLC_INIT_STATE(quant_tables);
const uint8_t *raw_quant_table = mpc7_quant_vlcs;
VLC_INIT_STATIC_FROM_LENGTHS(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
&mpc7_scfi[1], 2,
&mpc7_scfi[0], 2, 1, 0, 0, 1 << MPC7_SCFI_BITS);
VLC_INIT_STATIC_FROM_LENGTHS(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
&mpc7_dscf[1], 2,
&mpc7_dscf[0], 2, 1, -7, 0, 1 << MPC7_DSCF_BITS);
VLC_INIT_STATIC_FROM_LENGTHS(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
&mpc7_hdr[1], 2,
&mpc7_hdr[0], 2, 1, -5, 0, 1 << MPC7_HDR_BITS);
for (unsigned i = 0, offset = 0; i < MPC7_QUANT_VLC_TABLES; i++){
VLC_INIT_STATIC_TABLE_FROM_LENGTHS(scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
&mpc7_scfi[1], 2,
&mpc7_scfi[0], 2, 1, 0, 0);
VLC_INIT_STATIC_TABLE_FROM_LENGTHS(dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
&mpc7_dscf[1], 2,
&mpc7_dscf[0], 2, 1, -7, 0);
VLC_INIT_STATIC_TABLE_FROM_LENGTHS(hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
&mpc7_hdr[1], 2,
&mpc7_hdr[0], 2, 1, -5, 0);
for (int i = 0; i < MPC7_QUANT_VLC_TABLES; i++) {
for (int j = 0; j < 2; j++) {
quant_vlc[i][j].table = &quant_tables[offset];
quant_vlc[i][j].table_allocated = FF_ARRAY_ELEMS(quant_tables) - offset;
ff_vlc_init_from_lengths(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
&raw_quant_table[1], 2,
&raw_quant_table[0], 2, 1,
mpc7_quant_vlc_off[i],
VLC_INIT_STATIC_OVERLONG, NULL);
quant_vlc[i][j] =
ff_vlc_init_tables_from_lengths(&state, 9, mpc7_quant_vlc_sizes[i],
&raw_quant_table[1], 2,
&raw_quant_table[0], 2, 1,
mpc7_quant_vlc_off[i], 0);
raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
offset += quant_vlc[i][j].table_size;
}
}
ff_mpa_synth_init_fixed();
@ -134,7 +135,7 @@ static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *
case 1:
i1 = get_bits1(gb);
for(i = 0; i < SAMPLES_PER_BAND/3; i++){
t = get_vlc2(gb, quant_vlc[0][i1].table, 9, 2);
t = get_vlc2(gb, quant_vlc[0][i1], 9, 2);
*dst++ = mpc7_idx30[t];
*dst++ = mpc7_idx31[t];
*dst++ = mpc7_idx32[t];
@ -143,7 +144,7 @@ static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *
case 2:
i1 = get_bits1(gb);
for(i = 0; i < SAMPLES_PER_BAND/2; i++){
t = get_vlc2(gb, quant_vlc[1][i1].table, 9, 2);
t = get_vlc2(gb, quant_vlc[1][i1], 9, 2);
*dst++ = mpc7_idx50[t];
*dst++ = mpc7_idx51[t];
}
@ -151,7 +152,7 @@ static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *
case 3: case 4: case 5: case 6: case 7:
i1 = get_bits1(gb);
for(i = 0; i < SAMPLES_PER_BAND; i++)
*dst++ = get_vlc2(gb, quant_vlc[idx-1][i1].table, 9, 2);
*dst++ = get_vlc2(gb, quant_vlc[idx-1][i1], 9, 2);
break;
case 8: case 9: case 10: case 11: case 12:
case 13: case 14: case 15: case 16: case 17:
@ -166,7 +167,7 @@ static inline void idx_to_quant(MPCContext *c, GetBitContext *gb, int idx, int *
static int get_scale_idx(GetBitContext *gb, int ref)
{
int t = get_vlc2(gb, dscf_vlc.table, MPC7_DSCF_BITS, 1);
int t = get_vlc2(gb, dscf_vlc, MPC7_DSCF_BITS, 1);
if (t == 8)
return get_bits(gb, 6);
return ref + t;
@ -220,7 +221,7 @@ static int mpc7_decode_frame(AVCodecContext *avctx, AVFrame *frame,
/* read subband indexes */
for(i = 0; i <= c->maxbands; i++){
for(ch = 0; ch < 2; ch++){
int t = i ? get_vlc2(&gb, hdr_vlc.table, MPC7_HDR_BITS, 1) : 4;
int t = i ? get_vlc2(&gb, hdr_vlc, MPC7_HDR_BITS, 1) : 4;
if(t == 4) bands[i].res[ch] = get_bits(&gb, 4);
else bands[i].res[ch] = bands[i-1].res[ch] + t;
if (bands[i].res[ch] < -1 || bands[i].res[ch] > 17) {
@ -237,7 +238,8 @@ static int mpc7_decode_frame(AVCodecContext *avctx, AVFrame *frame,
/* get scale indexes coding method */
for(i = 0; i <= mb; i++)
for(ch = 0; ch < 2; ch++)
if(bands[i].res[ch]) bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc.table, MPC7_SCFI_BITS, 1);
if (bands[i].res[ch])
bands[i].scfi[ch] = get_vlc2(&gb, scfi_vlc, MPC7_SCFI_BITS, 1);
/* get scale indexes */
for(i = 0; i <= mb; i++){
for(ch = 0; ch < 2; ch++){