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Code Issues Releases Activity

h264: do not reinitialize the global cabac tables at each slice header

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This commit is contained in:
Anton Khirnov 2013-08-11 12:14:44 +02:00
parent e880418660
commit cab8c5f8e1
2 changed files with 8 additions and 1 deletions
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6
libavcodec/cabac.c
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@ -137,6 +137,10 @@ void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){
void ff_init_cabac_states(void) void ff_init_cabac_states(void)
{ {
int i, j; int i, j;
static int initialized = 0;
if (initialized)
return;
for(i=0; i<64; i++){ for(i=0; i<64; i++){
for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save for(j=0; j<4; j++){ //FIXME check if this is worth the 1 shift we save
@ -158,4 +162,6 @@ void ff_init_cabac_states(void)
for(i=0; i< 63; i++){ for(i=0; i< 63; i++){
ff_h264_last_coeff_flag_offset_8x8[i] = last_coeff_flag_offset_8x8[i]; ff_h264_last_coeff_flag_offset_8x8[i] = last_coeff_flag_offset_8x8[i];
} }
initialized = 1;
} }

3
libavcodec/h264.c
View File

@ -1548,6 +1548,8 @@ av_cold int ff_h264_decode_init(AVCodecContext *avctx)
ff_h264_decode_init_vlc(); ff_h264_decode_init_vlc();
ff_init_cabac_states();
h->pixel_shift = 0; h->pixel_shift = 0;
h->sps.bit_depth_luma = avctx->bits_per_raw_sample = 8; h->sps.bit_depth_luma = avctx->bits_per_raw_sample = 8;
@ -4244,7 +4246,6 @@ static int decode_slice(struct AVCodecContext *avctx, void *arg)
align_get_bits(&h->gb); align_get_bits(&h->gb);
/* init cabac */ /* init cabac */
ff_init_cabac_states();
ff_init_cabac_decoder(&h->cabac, ff_init_cabac_decoder(&h->cabac,
h->gb.buffer + get_bits_count(&h->gb) / 8, h->gb.buffer + get_bits_count(&h->gb) / 8,
(get_bits_left(&h->gb) + 7) / 8); (get_bits_left(&h->gb) + 7) / 8);