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Diffstat (limited to 'src/libffmpeg/libavcodec/h263.c')
-rw-r--r--src/libffmpeg/libavcodec/h263.c133
1 files changed, 70 insertions, 63 deletions
diff --git a/src/libffmpeg/libavcodec/h263.c b/src/libffmpeg/libavcodec/h263.c
index bc21e0cd8..63bf19059 100644
--- a/src/libffmpeg/libavcodec/h263.c
+++ b/src/libffmpeg/libavcodec/h263.c
@@ -22,6 +22,12 @@
* qpel decoding, gmc decoding, interlaced decoding,
* by Michael Niedermayer <michaelni@gmx.at>
*/
+
+/**
+ * @file h263.c
+ * @brief h263/mpeg4 codec
+ *
+ */
//#define DEBUG
#include "common.h"
@@ -67,15 +73,17 @@ static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr);
static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
int n, int coded, int intra);
static int h263_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr);
-static void mpeg4_inv_pred_ac(MpegEncContext * s, INT16 *block, int n,
+static void mpeg4_inv_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
int dir);
static void mpeg4_decode_sprite_trajectory(MpegEncContext * s);
static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr, int *dir_ptr);
extern UINT32 inverse[256];
-static UINT16 uni_DCtab_lum [512][2];
-static UINT16 uni_DCtab_chrom[512][2];
+static UINT8 uni_DCtab_lum_len[512];
+static UINT8 uni_DCtab_chrom_len[512];
+static UINT16 uni_DCtab_lum_bits[512];
+static UINT16 uni_DCtab_chrom_bits[512];
#ifdef CONFIG_ENCODERS
static UINT16 (*mv_penalty)[MAX_MV*2+1]= NULL;
@@ -999,7 +1007,7 @@ static int h263_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr)
}
-void h263_pred_acdc(MpegEncContext * s, INT16 *block, int n)
+void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n)
{
int x, y, wrap, a, c, pred_dc, scale, i;
INT16 *dc_val, *ac_val, *ac_val1;
@@ -1309,8 +1317,8 @@ static void init_uni_dc_tab(void)
uni_len++;
}
}
- uni_DCtab_lum[level+256][0]= uni_code;
- uni_DCtab_lum[level+256][1]= uni_len;
+ uni_DCtab_lum_bits[level+256]= uni_code;
+ uni_DCtab_lum_len [level+256]= uni_len;
/* chrominance */
uni_code= DCtab_chrom[size][0];
@@ -1324,8 +1332,8 @@ static void init_uni_dc_tab(void)
uni_len++;
}
}
- uni_DCtab_chrom[level+256][0]= uni_code;
- uni_DCtab_chrom[level+256][1]= uni_len;
+ uni_DCtab_chrom_bits[level+256]= uni_code;
+ uni_DCtab_chrom_len [level+256]= uni_len;
}
}
@@ -1446,6 +1454,8 @@ void h263_encode_init(MpegEncContext *s)
s->intra_ac_vlc_last_length= uni_mpeg4_intra_rl_len + 128*64;
s->inter_ac_vlc_length = uni_mpeg4_inter_rl_len;
s->inter_ac_vlc_last_length= uni_mpeg4_inter_rl_len + 128*64;
+ s->luma_dc_vlc_length= uni_DCtab_lum_len;
+ s->chroma_dc_vlc_length= uni_DCtab_chrom_len;
s->ac_esc_length= 7+2+1+6+1+12+1;
break;
case CODEC_ID_H263P:
@@ -1470,6 +1480,11 @@ void h263_encode_init(MpegEncContext *s)
}
}
+/**
+ * encodes a 8x8 block.
+ * @param block the 8x8 block
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ */
static void h263_encode_block(MpegEncContext * s, DCTELEM * block, int n)
{
int level, run, last, i, j, last_index, last_non_zero, sign, slevel, code;
@@ -1795,6 +1810,13 @@ static void change_qscale(MpegEncContext * s, int dquant)
s->c_dc_scale= s->c_dc_scale_table[ s->qscale ];
}
+/**
+ * predicts the dc.
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ * @param dc_val_ptr a pointer to the dc_val entry for the current MB will be stored here
+ * @param dir_ptr pointer to an integer where the prediction direction will be stored
+ * @return the quantized predicted dc
+ */
static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr, int *dir_ptr)
{
int a, b, c, wrap, pred, scale;
@@ -1852,7 +1874,12 @@ static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_pt
return pred;
}
-void mpeg4_pred_ac(MpegEncContext * s, INT16 *block, int n,
+/**
+ * predicts the ac.
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ * @param dir the ac prediction direction
+ */
+void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
int dir)
{
int i;
@@ -1907,7 +1934,7 @@ void mpeg4_pred_ac(MpegEncContext * s, INT16 *block, int n,
}
-static void mpeg4_inv_pred_ac(MpegEncContext * s, INT16 *block, int n,
+static void mpeg4_inv_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
int dir)
{
int i;
@@ -1950,6 +1977,10 @@ static void mpeg4_inv_pred_ac(MpegEncContext * s, INT16 *block, int n,
}
}
+/**
+ * encodes the dc value.
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ */
static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
{
#if 1
@@ -1957,10 +1988,10 @@ static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
level+=256;
if (n < 4) {
/* luminance */
- put_bits(s, uni_DCtab_lum[level][1], uni_DCtab_lum[level][0]);
+ put_bits(s, uni_DCtab_lum_len[level], uni_DCtab_lum_bits[level]);
} else {
/* chrominance */
- put_bits(s, uni_DCtab_chrom[level][1], uni_DCtab_chrom[level][0]);
+ put_bits(s, uni_DCtab_chrom_len[level], uni_DCtab_chrom_bits[level]);
}
#else
int size, v;
@@ -1991,6 +2022,10 @@ static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
#endif
}
#ifdef CONFIG_ENCODERS
+/**
+ * encodes a 8x8 block
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ */
static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
UINT8 *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
{
@@ -2175,44 +2210,6 @@ static VLC dc_lum, dc_chrom;
static VLC sprite_trajectory;
static VLC mb_type_b_vlc;
-void init_rl(RLTable *rl)
-{
- INT8 max_level[MAX_RUN+1], max_run[MAX_LEVEL+1];
- UINT8 index_run[MAX_RUN+1];
- int last, run, level, start, end, i;
-
- /* compute max_level[], max_run[] and index_run[] */
- for(last=0;last<2;last++) {
- if (last == 0) {
- start = 0;
- end = rl->last;
- } else {
- start = rl->last;
- end = rl->n;
- }
-
- memset(max_level, 0, MAX_RUN + 1);
- memset(max_run, 0, MAX_LEVEL + 1);
- memset(index_run, rl->n, MAX_RUN + 1);
- for(i=start;i<end;i++) {
- run = rl->table_run[i];
- level = rl->table_level[i];
- if (index_run[run] == rl->n)
- index_run[run] = i;
- if (level > max_level[run])
- max_level[run] = level;
- if (run > max_run[level])
- max_run[level] = run;
- }
- rl->max_level[last] = av_malloc(MAX_RUN + 1);
- memcpy(rl->max_level[last], max_level, MAX_RUN + 1);
- rl->max_run[last] = av_malloc(MAX_LEVEL + 1);
- memcpy(rl->max_run[last], max_run, MAX_LEVEL + 1);
- rl->index_run[last] = av_malloc(MAX_RUN + 1);
- memcpy(rl->index_run[last], index_run, MAX_RUN + 1);
- }
-}
-
void init_vlc_rl(RLTable *rl)
{
int i, q;
@@ -2331,7 +2328,7 @@ static int h263_decode_gob_header(MpegEncContext *s)
/* We have a GBSC probably with GSTUFF */
skip_bits(&s->gb, 16); /* Drop the zeros */
- left= s->gb.size*8 - get_bits_count(&s->gb);
+ left= s->gb.size_in_bits - get_bits_count(&s->gb);
//MN: we must check the bits left or we might end in a infinite loop (or segfault)
for(;left>13; left--){
if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
@@ -2431,7 +2428,7 @@ static inline int mpeg4_is_resync(MpegEncContext *s){
return 0;
}
- if(bits_count + 8 >= s->gb.size*8){
+ if(bits_count + 8 >= s->gb.size_in_bits){
int v= show_bits(&s->gb, 8);
v|= 0x7F >> (7-(bits_count&7));
@@ -2468,7 +2465,7 @@ static int mpeg4_decode_video_packet_header(MpegEncContext *s)
int header_extension=0, mb_num, len;
/* is there enough space left for a video packet + header */
- if( get_bits_count(&s->gb) > s->gb.size*8-20) return -1;
+ if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
for(len=0; len<32; len++){
if(get_bits1(&s->gb)) break;
@@ -2600,7 +2597,7 @@ int ff_h263_resync(MpegEncContext *s){
//ok, its not where its supposed to be ...
s->gb= s->last_resync_gb;
align_get_bits(&s->gb);
- left= s->gb.size*8 - get_bits_count(&s->gb);
+ left= s->gb.size_in_bits - get_bits_count(&s->gb);
for(;left>16+1+5+5; left-=8){
if(show_bits(&s->gb, 16)==0){
@@ -2622,6 +2619,7 @@ int ff_h263_resync(MpegEncContext *s){
}
/**
+ * gets the average motion vector for a GMC MB.
* @param n either 0 for the x component or 1 for y
* @returns the average MV for a GMC MB
*/
@@ -2654,8 +2652,7 @@ static inline int get_amv(MpegEncContext *s, int n){
v+= dx;
}
}
- sum /= 256;
- sum= RSHIFT(sum<<s->quarter_sample, a);
+ sum= RSHIFT(sum, a+8-s->quarter_sample);
}
if (sum < -len) sum= -len;
@@ -3055,7 +3052,7 @@ static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
/* per-MB end of slice check */
if(--s->mb_num_left <= 0){
-//printf("%06X %d\n", show_bits(&s->gb, 24), s->gb.size*8 - get_bits_count(&s->gb));
+//printf("%06X %d\n", show_bits(&s->gb, 24), s->gb.size_in_bits - get_bits_count(&s->gb));
if(mpeg4_is_resync(s))
return SLICE_END;
else
@@ -3419,8 +3416,8 @@ end:
}else{
int v= show_bits(&s->gb, 16);
- if(get_bits_count(&s->gb) + 16 > s->gb.size*8){
- v>>= get_bits_count(&s->gb) + 16 - s->gb.size*8;
+ if(get_bits_count(&s->gb) + 16 > s->gb.size_in_bits){
+ v>>= get_bits_count(&s->gb) + 16 - s->gb.size_in_bits;
}
if(v==0)
@@ -3588,6 +3585,12 @@ not_coded:
return 0;
}
+/**
+ * decodes the dc value.
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ * @param dir_ptr the prediction direction will be stored here
+ * @return the quantized dc
+ */
static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
{
int level, pred, code;
@@ -4473,6 +4476,10 @@ static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
return 0;
}
+/**
+ * decodes the user data stuff in the header.
+ * allso inits divx/xvid/lavc_version/build
+ */
static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
char buf[256];
int i;
@@ -4685,7 +4692,7 @@ static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
printf("qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d\n",
s->qscale, s->f_code, s->b_code,
s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")),
- gb->size,s->progressive_sequence, s->alternate_scan, s->top_field_first,
+ gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
s->sprite_warping_accuracy);
}
@@ -4740,9 +4747,9 @@ int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
v = get_bits(gb, 8);
startcode = ((startcode << 8) | v) & 0xffffffff;
- if(get_bits_count(gb) >= gb->size*8){
- if(gb->size==1 && s->divx_version){
- printf("frame skip %d\n", gb->size);
+ if(get_bits_count(gb) >= gb->size_in_bits){
+ if(gb->size_in_bits==8 && s->divx_version){
+ printf("frame skip %d\n", gb->size_in_bits);
return FRAME_SKIPED; //divx bug
}else
return -1; //end of stream
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-16 22:51:14 +0000