cosmetic patch:
Doxygen-style comments added some more comments Originally committed as revision 5602 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefan Gehrer
parent
05103ed33f
commit
f503b19574
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@ -17,6 +17,12 @@
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file cavs.c
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* Chinese AVS video (AVS1-P2, JiZhun profile) decoder
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* @author Stefan Gehrer <stefan.gehrer@gmx.de>
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*/
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#include "avcodec.h"
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#include "bitstream.h"
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#include "golomb.h"
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@ -25,27 +31,27 @@
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typedef struct {
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MpegEncContext s;
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Picture picture; //currently decoded frame
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Picture DPB[2]; //reference frames
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int dist[2]; //temporal distances from current frame to ref frames
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Picture picture; ///< currently decoded frame
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Picture DPB[2]; ///< reference frames
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int dist[2]; ///< temporal distances from current frame to ref frames
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int profile, level;
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int aspect_ratio;
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int mb_width, mb_height;
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int pic_type;
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int progressive;
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int pic_structure;
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int skip_mode_flag;
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int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
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int loop_filter_disable;
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int alpha_offset, beta_offset;
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int ref_flag;
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int mbx, mby;
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int flags;
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int stc;
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uint8_t *cy, *cu, *cv;
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int mbx, mby; ///< macroblock coordinates
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int flags; ///< availability flags of neighbouring macroblocks
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int stc; ///< last start code
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uint8_t *cy, *cu, *cv; ///< current MB sample pointers
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int left_qp;
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uint8_t *top_qp;
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/* mv motion vector cache
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/** mv motion vector cache
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0: D3 B2 B3 C2
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4: A1 X0 X1 -
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8: A3 X2 X3 -
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@ -61,7 +67,7 @@ typedef struct {
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vector_t *top_mv[2];
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vector_t *col_mv;
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/* luma pred mode cache
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/** luma pred mode cache
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0: -- B2 B3
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3: A1 X0 X1
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6: A3 X2 X3 */
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@ -73,7 +79,7 @@ typedef struct {
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int qp_fixed;
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int cbp;
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/* intra prediction is done with un-deblocked samples
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/** intra prediction is done with un-deblocked samples
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they are saved here before deblocking the MB */
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uint8_t *top_border_y, *top_border_u, *top_border_v;
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uint8_t left_border_y[16], left_border_u[10], left_border_v[10];
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@ -83,9 +89,12 @@ typedef struct {
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void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
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uint8_t *col_type_base;
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uint8_t *col_type;
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int sym_factor;
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int direct_den[2];
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int scale_den[2];
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/* scaling factors for MV prediction */
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int sym_factor; ///< for scaling in symmetrical B block
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int direct_den[2]; ///< for scaling in direct B block
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int scale_den[2]; ///< for scaling neighbouring MVs
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int got_keyframe;
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} AVSContext;
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@ -120,7 +129,15 @@ static inline int get_bs_b(vector_t *mvP, vector_t *mvQ) {
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return 0;
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}
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/* boundary strength (bs) mapping:
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#define SET_PARAMS \
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alpha = alpha_tab[clip(qp_avg + h->alpha_offset,0,63)]; \
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beta = beta_tab[clip(qp_avg + h->beta_offset, 0,63)]; \
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tc = tc_tab[clip(qp_avg + h->alpha_offset,0,63)];
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/**
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* in-loop deblocking filter for a single macroblock
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*
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* boundary strength (bs) mapping:
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*
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* --4---5--
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* 0 2 |
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@ -129,12 +146,6 @@ static inline int get_bs_b(vector_t *mvP, vector_t *mvQ) {
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* ---------
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*
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*/
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#define SET_PARAMS \
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alpha = alpha_tab[clip(qp_avg + h->alpha_offset,0,63)]; \
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beta = beta_tab[clip(qp_avg + h->beta_offset, 0,63)]; \
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tc = tc_tab[clip(qp_avg + h->alpha_offset,0,63)];
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static void filter_mb(AVSContext *h, enum mb_t mb_type) {
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DECLARE_ALIGNED_8(uint8_t, bs[8]);
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int qp_avg, alpha, beta, tc;
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@ -665,7 +676,7 @@ static void mv_pred(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC,
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*
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****************************************************************************/
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/* kth-order exponential golomb code */
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/** kth-order exponential golomb code */
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static inline int get_ue_code(GetBitContext *gb, int order) {
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if(order) {
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int ret = get_ue_golomb(gb) << order;
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@ -674,6 +685,15 @@ static inline int get_ue_code(GetBitContext *gb, int order) {
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return get_ue_golomb(gb);
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}
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/**
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* decode coefficients from one 8x8 block, dequantize, inverse transform
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* and add them to sample block
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* @param r pointer to 2D VLC table
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* @param esc_golomb_order escape codes are k-golomb with this order k
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* @param qp quantizer
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* @param dst location of sample block
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* @param stride line stride in frame buffer
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*/
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static int decode_residual_block(AVSContext *h, GetBitContext *gb,
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const residual_vlc_t *r, int esc_golomb_order,
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int qp, uint8_t *dst, int stride) {
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@ -756,6 +776,9 @@ static inline void decode_residual_inter(AVSContext *h) {
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*
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****************************************************************************/
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/**
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* initialise predictors for motion vectors and intra prediction
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*/
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static inline void init_mb(AVSContext *h) {
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int i;
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@ -795,6 +818,11 @@ static inline void init_mb(AVSContext *h) {
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static inline void check_for_slice(AVSContext *h);
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/**
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* save predictors for later macroblocks and increase
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* macroblock address
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* @returns 0 if end of frame is reached, 1 otherwise
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*/
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static inline int next_mb(AVSContext *h) {
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int i;
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@ -1259,18 +1287,16 @@ static int decode_pic(AVSContext *h) {
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goto done;
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}
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mb_type = get_ue_golomb(&s->gb) + P_16X16;
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} else {
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} else
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mb_type = get_ue_golomb(&s->gb) + P_SKIP;
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}
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init_mb(h);
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if(mb_type > P_8X8) {
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h->cbp = cbp_tab[mb_type - P_8X8 - 1][0];
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decode_mb_i(h,0);
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} else {
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} else
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decode_mb_p(h,mb_type);
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}
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} while(next_mb(h));
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} else { //FF_B_TYPE
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} else { /* FF_B_TYPE */
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do {
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if(h->skip_mode_flag) {
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skip_count = get_ue_golomb(&s->gb);
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@ -1283,16 +1309,14 @@ static int decode_pic(AVSContext *h) {
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goto done;
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}
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mb_type = get_ue_golomb(&s->gb) + B_DIRECT;
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} else {
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} else
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mb_type = get_ue_golomb(&s->gb) + B_SKIP;
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}
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init_mb(h);
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if(mb_type > B_8X8) {
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h->cbp = cbp_tab[mb_type - B_8X8 - 1][0];
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decode_mb_i(h,0);
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} else {
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} else
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decode_mb_b(h,mb_type);
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}
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} while(next_mb(h));
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}
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done:
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@ -1312,6 +1336,11 @@ static int decode_pic(AVSContext *h) {
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*
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****************************************************************************/
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/**
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* some predictions require data from the top-neighbouring macroblock.
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* this data has to be stored for one complete row of macroblocks
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* and this storage space is allocated here
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*/
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static void init_top_lines(AVSContext *h) {
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/* alloc top line of predictors */
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h->top_qp = av_malloc( h->mb_width);
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@ -194,15 +194,15 @@ DECLARE_ALIGNED_8(typedef, struct) {
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int16_t ref;
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} vector_t;
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// marks block as unavailable, i.e. out of picture
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// or not yet decoded
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/** marks block as unavailable, i.e. out of picture
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or not yet decoded */
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static const vector_t un_mv = {0,0,1,NOT_AVAIL};
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//marks block as "no prediction from this direction"
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// e.g. forward motion vector in BWD partition
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/** marks block as "no prediction from this direction"
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e.g. forward motion vector in BWD partition */
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static const vector_t dir_mv = {0,0,1,REF_DIR};
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//marks block as using intra prediction
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/** marks block as using intra prediction */
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static const vector_t intra_mv = {0,0,1,REF_INTRA};
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typedef struct residual_vlc_t {
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