*/
/**
- * @file libavcodec/h264_cabac.c
+ * @file
* H.264 / AVC / MPEG4 part10 cabac decoding.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
nza = h->left_cbp&0x100;
nzb = h-> top_cbp&0x100;
} else {
+ idx -= CHROMA_DC_BLOCK_INDEX;
nza = (h->left_cbp>>(6+idx))&0x01;
nzb = (h-> top_cbp>>(6+idx))&0x01;
}
#define CC &h->cabac
#endif
-
- /* cat: 0-> DC 16x16 n = 0
- * 1-> AC 16x16 n = luma4x4idx
- * 2-> Luma4x4 n = luma4x4idx
- * 3-> DC Chroma n = iCbCr
- * 4-> AC Chroma n = 16 + 4 * iCbCr + chroma4x4idx
- * 5-> Luma8x8 n = 4 * luma8x8idx
- */
-
- /* read coded block flag */
- if( is_dc || cat != 5 ) {
- if( get_cabac( CC, &h->cabac_state[85 + get_cabac_cbf_ctx( h, cat, n, is_dc ) ] ) == 0 ) {
- if( !is_dc )
- h->non_zero_count_cache[scan8[n]] = 0;
-
-#ifdef CABAC_ON_STACK
- h->cabac.range = cc.range ;
- h->cabac.low = cc.low ;
- h->cabac.bytestream= cc.bytestream;
-#endif
- return;
- }
- }
-
significant_coeff_ctx_base = h->cabac_state
+ significant_coeff_flag_offset[MB_FIELD][cat];
last_coeff_ctx_base = h->cabac_state
if( cat == 0 )
h->cbp_table[h->mb_xy] |= 0x100;
else
- h->cbp_table[h->mb_xy] |= 0x40 << n;
+ h->cbp_table[h->mb_xy] |= 0x40 << (n - CHROMA_DC_BLOCK_INDEX);
+ h->non_zero_count_cache[scan8[n]] = coeff_count;
} else {
if( cat == 5 )
fill_rectangle(&h->non_zero_count_cache[scan8[n]], 2, 2, 8, coeff_count, 1);
}
-static void decode_cabac_residual_dc( H264Context *h, DCTELEM *block, int cat, int n, const uint8_t *scantable, int max_coeff ) {
+static void decode_cabac_residual_dc_internal( H264Context *h, DCTELEM *block, int cat, int n, const uint8_t *scantable, int max_coeff ) {
decode_cabac_residual_internal(h, block, cat, n, scantable, NULL, max_coeff, 1);
}
-static void decode_cabac_residual_nondc( H264Context *h, DCTELEM *block, int cat, int n, const uint8_t *scantable, const uint32_t *qmul, int max_coeff ) {
+static void decode_cabac_residual_nondc_internal( H264Context *h, DCTELEM *block, int cat, int n, const uint8_t *scantable, const uint32_t *qmul, int max_coeff ) {
decode_cabac_residual_internal(h, block, cat, n, scantable, qmul, max_coeff, 0);
}
+/* cat: 0-> DC 16x16 n = 0
+ * 1-> AC 16x16 n = luma4x4idx
+ * 2-> Luma4x4 n = luma4x4idx
+ * 3-> DC Chroma n = iCbCr
+ * 4-> AC Chroma n = 16 + 4 * iCbCr + chroma4x4idx
+ * 5-> Luma8x8 n = 4 * luma8x8idx */
+
+/* Partially inline the CABAC residual decode: inline the coded block flag.
+ * This has very little impact on binary size and improves performance
+ * because it allows improved constant propagation into get_cabac_cbf_ctx,
+ * as well as because most blocks have zero CBFs. */
+
+static av_always_inline void decode_cabac_residual_dc( H264Context *h, DCTELEM *block, int cat, int n, const uint8_t *scantable, int max_coeff ) {
+ /* read coded block flag */
+ if( get_cabac( &h->cabac, &h->cabac_state[85 + get_cabac_cbf_ctx( h, cat, n, 1 ) ] ) == 0 ) {
+ h->non_zero_count_cache[scan8[n]] = 0;
+ return;
+ }
+ decode_cabac_residual_dc_internal( h, block, cat, n, scantable, max_coeff );
+}
+
+static av_always_inline void decode_cabac_residual_nondc( H264Context *h, DCTELEM *block, int cat, int n, const uint8_t *scantable, const uint32_t *qmul, int max_coeff ) {
+ /* read coded block flag */
+ if( cat != 5 && get_cabac( &h->cabac, &h->cabac_state[85 + get_cabac_cbf_ctx( h, cat, n, 0 ) ] ) == 0 ) {
+ h->non_zero_count_cache[scan8[n]] = 0;
+ return;
+ }
+ decode_cabac_residual_nondc_internal( h, block, cat, n, scantable, qmul, max_coeff );
+}
+
/**
* decodes a macroblock
- * @returns 0 if OK, AC_ERROR / DC_ERROR / MV_ERROR if an error is noticed
+ * @return 0 if OK, AC_ERROR / DC_ERROR / MV_ERROR if an error is noticed
*/
int ff_h264_decode_mb_cabac(H264Context *h) {
MpegEncContext * const s = &h->s;
pred_mode= ff_h264_check_intra_pred_mode( h, pred_mode );
if( pred_mode < 0 ) return -1;
h->chroma_pred_mode= pred_mode;
+ } else {
+ h->chroma_pred_mode= DC_128_PRED8x8;
}
} else if( partition_count == 4 ) {
int i, j, sub_partition_count[4], list, ref[2][4];
s->current_picture.mb_type[mb_xy]= mb_type;
if( cbp || IS_INTRA16x16( mb_type ) ) {
- const uint8_t *scan, *scan8x8, *dc_scan;
+ const uint8_t *scan, *scan8x8;
const uint32_t *qmul;
if(IS_INTERLACED(mb_type)){
scan8x8= s->qscale ? h->field_scan8x8 : h->field_scan8x8_q0;
scan= s->qscale ? h->field_scan : h->field_scan_q0;
- dc_scan= luma_dc_field_scan;
}else{
scan8x8= s->qscale ? h->zigzag_scan8x8 : h->zigzag_scan8x8_q0;
scan= s->qscale ? h->zigzag_scan : h->zigzag_scan_q0;
- dc_scan= luma_dc_zigzag_scan;
}
// decode_cabac_mb_dqp
if( IS_INTRA16x16( mb_type ) ) {
int i;
//av_log( s->avctx, AV_LOG_ERROR, "INTRA16x16 DC\n" );
- decode_cabac_residual_dc( h, h->mb, 0, 0, dc_scan, 16);
+ AV_ZERO128(h->mb_luma_dc+0);
+ AV_ZERO128(h->mb_luma_dc+8);
+ decode_cabac_residual_dc( h, h->mb_luma_dc, 0, LUMA_DC_BLOCK_INDEX, scan, 16);
if( cbp&15 ) {
qmul = h->dequant4_coeff[0][s->qscale];
int c;
for( c = 0; c < 2; c++ ) {
//av_log( s->avctx, AV_LOG_ERROR, "INTRA C%d-DC\n",c );
- decode_cabac_residual_dc(h, h->mb + 256 + 16*4*c, 3, c, chroma_dc_scan, 4);
+ decode_cabac_residual_dc(h, h->mb + 256 + 16*4*c, 3, CHROMA_DC_BLOCK_INDEX+c, chroma_dc_scan, 4);
}
}
projects / ffmpeg / blobdiff