mirror of https://git.ffmpeg.org/ffmpeg.git
avcodec/atrac9dec: Make VLCs static
Also remove code duplication and use a named constant for the number of VLC bits while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt
parent
76a4356a75
commit
984fdfd042
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@ -19,6 +19,8 @@
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/thread.h"
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#include "internal.h"
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#include "get_bits.h"
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#include "fft.h"
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@ -27,6 +29,7 @@
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#include "libavutil/float_dsp.h"
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#define ATRAC9_SF_VLC_BITS 8
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#define ATRAC9_COEFF_VLC_BITS 9
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typedef struct ATRAC9ChannelData {
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int band_ext;
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@ -92,14 +95,15 @@ typedef struct ATRAC9Context {
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const ATRAC9BlockConfig *block_config;
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/* Generated on init */
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VLC sf_vlc[2][8]; /* Signed/unsigned, length */
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VLC coeff_vlc[2][8][4]; /* Cookbook, precision, cookbook index */
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uint8_t alloc_curve[48][48];
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DECLARE_ALIGNED(32, float, imdct_win)[256];
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DECLARE_ALIGNED(32, float, temp)[256];
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} ATRAC9Context;
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static VLC sf_vlc[2][8]; /* Signed/unsigned, length */
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static VLC coeff_vlc[2][8][4]; /* Cookbook, precision, cookbook index */
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static inline int parse_gradient(ATRAC9Context *s, ATRAC9BlockData *b,
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GetBitContext *gb)
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{
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@ -269,7 +273,7 @@ static inline int read_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
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const uint8_t *sf_weights = at9_tab_sf_weights[get_bits(gb, 3)];
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const int base = get_bits(gb, 5);
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const int len = get_bits(gb, 2) + 3;
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const VLC *tab = &s->sf_vlc[0][len];
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const VLC *tab = &sf_vlc[0][len];
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c->scalefactors[0] = get_bits(gb, len);
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@ -302,7 +306,7 @@ static inline int read_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
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const int len = get_bits(gb, 2) + 2;
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const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
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const VLC *tab = &s->sf_vlc[1][len];
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const VLC *tab = &sf_vlc[1][len];
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for (int i = 0; i < unit_cnt; i++) {
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int dist = get_vlc2(gb, tab->table, ATRAC9_SF_VLC_BITS, 1);
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@ -323,7 +327,7 @@ static inline int read_scalefactors(ATRAC9Context *s, ATRAC9BlockData *b,
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const int base = get_bits(gb, 5) - (1 << (5 - 1));
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const int len = get_bits(gb, 2) + 1;
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const int unit_cnt = FFMIN(b->band_ext_q_unit, baseline_len);
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const VLC *tab = &s->sf_vlc[0][len];
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const VLC *tab = &sf_vlc[0][len];
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c->scalefactors[0] = get_bits(gb, len);
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@ -410,12 +414,12 @@ static inline void read_coeffs_coarse(ATRAC9Context *s, ATRAC9BlockData *b,
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if (prec <= max_prec) {
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const int cb = c->codebookset[i];
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const int cbi = at9_q_unit_to_codebookidx[i];
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const VLC *tab = &s->coeff_vlc[cb][prec][cbi];
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const VLC *tab = &coeff_vlc[cb][prec][cbi];
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const HuffmanCodebook *huff = &at9_huffman_coeffs[cb][prec][cbi];
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const int groups = bands >> huff->value_cnt_pow;
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for (int j = 0; j < groups; j++) {
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uint16_t val = get_vlc2(gb, tab->table, 9, 2);
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uint16_t val = get_vlc2(gb, tab->table, ATRAC9_COEFF_VLC_BITS, 2);
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for (int k = 0; k < huff->value_cnt; k++) {
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coeffs[k] = sign_extend(val, huff->value_bits);
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@ -828,28 +832,72 @@ static av_cold int atrac9_decode_close(AVCodecContext *avctx)
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{
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ATRAC9Context *s = avctx->priv_data;
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for (int i = 1; i < 7; i++)
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ff_free_vlc(&s->sf_vlc[0][i]);
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for (int i = 2; i < 6; i++)
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ff_free_vlc(&s->sf_vlc[1][i]);
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for (int i = 0; i < 2; i++)
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for (int j = 0; j < 8; j++)
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for (int k = 0; k < 4; k++)
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ff_free_vlc(&s->coeff_vlc[i][j][k]);
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ff_mdct_end(&s->imdct);
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av_freep(&s->fdsp);
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return 0;
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}
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static av_cold void atrac9_init_vlc(VLC *vlc, int nb_bits, int nb_codes,
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const uint8_t (**tab)[2],
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unsigned *buf_offset, int offset)
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{
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static VLC_TYPE vlc_buf[24812][2];
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vlc->table = &vlc_buf[*buf_offset];
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vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *buf_offset;
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ff_init_vlc_from_lengths(vlc, nb_bits, nb_codes,
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&(*tab)[0][1], 2, &(*tab)[0][0], 2, 1,
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offset, INIT_VLC_STATIC_OVERLONG, NULL);
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*buf_offset += vlc->table_size;
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*tab += nb_codes;
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}
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static av_cold void atrac9_init_static(void)
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{
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const uint8_t (*tab)[2];
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unsigned offset = 0;
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/* Unsigned scalefactor VLCs */
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tab = at9_sfb_a_tab;
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for (int i = 1; i < 7; i++) {
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const HuffmanCodebook *hf = &at9_huffman_sf_unsigned[i];
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atrac9_init_vlc(&sf_vlc[0][i], ATRAC9_SF_VLC_BITS,
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hf->size, &tab, &offset, 0);
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}
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/* Signed scalefactor VLCs */
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tab = at9_sfb_b_tab;
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for (int i = 2; i < 6; i++) {
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const HuffmanCodebook *hf = &at9_huffman_sf_signed[i];
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/* The symbols are signed integers in the range -16..15;
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* the values in the source table are offset by 16 to make
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* them fit into an uint8_t; the -16 reverses this shift. */
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atrac9_init_vlc(&sf_vlc[1][i], ATRAC9_SF_VLC_BITS,
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hf->size, &tab, &offset, -16);
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}
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/* Coefficient VLCs */
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tab = at9_coeffs_tab;
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for (int i = 0; i < 2; i++) {
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for (int j = 2; j < 8; j++) {
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for (int k = i; k < 4; k++) {
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const HuffmanCodebook *hf = &at9_huffman_coeffs[i][j][k];
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atrac9_init_vlc(&coeff_vlc[i][j][k], ATRAC9_COEFF_VLC_BITS,
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hf->size, &tab, &offset, 0);
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}
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}
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}
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}
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static av_cold int atrac9_decode_init(AVCodecContext *avctx)
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{
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static AVOnce static_table_init = AV_ONCE_INIT;
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GetBitContext gb;
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ATRAC9Context *s = avctx->priv_data;
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int version, block_config_idx, superframe_idx, alloc_c_len;
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const uint8_t (*tab)[2];
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int ret;
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s->avctx = avctx;
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@ -932,50 +980,7 @@ static av_cold int atrac9_decode_init(AVCodecContext *avctx)
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for (int j = 0; j < i; j++)
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s->alloc_curve[i - 1][j] = at9_tab_b_dist[(j * alloc_c_len) / i];
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/* Unsigned scalefactor VLCs */
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tab = at9_sfb_a_tab;
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for (int i = 1; i < 7; i++) {
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const HuffmanCodebook *hf = &at9_huffman_sf_unsigned[i];
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ret = ff_init_vlc_from_lengths(&s->sf_vlc[0][i], ATRAC9_SF_VLC_BITS,
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hf->size, &tab[0][1], 2,
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&tab[0][0], 2, 1, 0, 0, avctx);
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if (ret < 0)
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return ret;
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tab += hf->size;
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}
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/* Signed scalefactor VLCs */
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tab = at9_sfb_b_tab;
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for (int i = 2; i < 6; i++) {
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const HuffmanCodebook *hf = &at9_huffman_sf_signed[i];
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/* The symbols are signed integers in the range -16..15;
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* the values in the source table are offset by 16 to make
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* them fit into an uint8_t; the -16 reverses this shift. */
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ret = ff_init_vlc_from_lengths(&s->sf_vlc[1][i], ATRAC9_SF_VLC_BITS,
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hf->size, &tab[0][1], 2,
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&tab[0][0], 2, 1, -16, 0, avctx);
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if (ret < 0)
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return ret;
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tab += hf->size;
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}
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/* Coefficient VLCs */
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tab = at9_coeffs_tab;
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for (int i = 0; i < 2; i++) {
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for (int j = 2; j < 8; j++) {
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for (int k = i; k < 4; k++) {
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const HuffmanCodebook *hf = &at9_huffman_coeffs[i][j][k];
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ret = ff_init_vlc_from_lengths(&s->coeff_vlc[i][j][k], 9,
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hf->size, &tab[0][1], 2,
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&tab[0][0], 2, 1, 0, 0, avctx);
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if (ret < 0)
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return ret;
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tab += hf->size;
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}
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}
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}
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ff_thread_once(&static_table_init, atrac9_init_static);
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return 0;
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}
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