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avcodec/imc: 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 23:13:15 +02:00
parent 6fb96ef755
commit 7fee90efac
1 changed files with 11 additions and 17 deletions
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28
libavcodec/imc.c
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@ -106,7 +106,7 @@ typedef struct IMCContext {
AVCodecContext *avctx;
} IMCContext;
static VLC huffman_vlc[4][4];
static const VLCElem *huffman_vlc[4][4];
#define IMC_VLC_BITS 9
#define VLC_TABLES_SIZE 9512
@ -171,16 +171,15 @@ static av_cold void iac_generate_tabs(IMCContext *q, int sampling_rate)
static av_cold void imc_init_static(void)
{
VLCInitState state = VLC_INIT_STATE(vlc_tables);
/* initialize the VLC tables */
for (int i = 0, offset = 0; i < 4 ; i++) {
for (int i = 0; i < 4 ; i++) {
for (int j = 0; j < 4; j++) {
huffman_vlc[i][j].table = &vlc_tables[offset];
huffman_vlc[i][j].table_allocated = VLC_TABLES_SIZE - offset;
ff_vlc_init_from_lengths(&huffman_vlc[i][j], IMC_VLC_BITS, imc_huffman_sizes[i],
imc_huffman_lens[i][j], 1,
imc_huffman_syms[i][j], 1, 1,
0, VLC_INIT_STATIC_OVERLONG, NULL);
offset += huffman_vlc[i][j].table_size;
huffman_vlc[i][j] =
ff_vlc_init_tables_from_lengths(&state, IMC_VLC_BITS, imc_huffman_sizes[i],
imc_huffman_lens[i][j], 1,
imc_huffman_syms[i][j], 1, 1,
0, 0);
}
}
}
@ -311,16 +310,11 @@ static void imc_read_level_coeffs(IMCContext *q, int stream_format_code,
int *levlCoeffs)
{
int i;
VLC *hufftab[4];
int start = 0;
const uint8_t *cb_sel;
int s;
int s = stream_format_code >> 1;
const VLCElem * const *const hufftab = huffman_vlc[s];
s = stream_format_code >> 1;
hufftab[0] = &huffman_vlc[s][0];
hufftab[1] = &huffman_vlc[s][1];
hufftab[2] = &huffman_vlc[s][2];
hufftab[3] = &huffman_vlc[s][3];
cb_sel = imc_cb_select[s];
if (stream_format_code & 4)
@ -328,7 +322,7 @@ static void imc_read_level_coeffs(IMCContext *q, int stream_format_code,
if (start)
levlCoeffs[0] = get_bits(&q->gb, 7);
for (i = start; i < BANDS; i++) {
levlCoeffs[i] = get_vlc2(&q->gb, hufftab[cb_sel[i]]->table,
levlCoeffs[i] = get_vlc2(&q->gb, hufftab[cb_sel[i]],
IMC_VLC_BITS, 2);
if (levlCoeffs[i] == 17)
levlCoeffs[i] += get_bits(&q->gb, 4);