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Originally committed as revision 1511 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-01-26 23:09:12 +00:00
parent 6852ac95dd
commit 2ba8f6b817
1 changed files with 42 additions and 0 deletions
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42
libavcodec/h263.c
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@ -22,6 +22,12 @@
* qpel decoding, gmc decoding, interlaced decoding, * qpel decoding, gmc decoding, interlaced decoding,
* by Michael Niedermayer <michaelni@gmx.at> * by Michael Niedermayer <michaelni@gmx.at>
*/ */
/**
* @file h263.c
* @brief h263/mpeg4 codec
*
*/
//#define DEBUG //#define DEBUG
#include "common.h" #include "common.h"
@ -1474,6 +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) 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; int level, run, last, i, j, last_index, last_non_zero, sign, slevel, code;
@ -1799,6 +1810,13 @@ static void change_qscale(MpegEncContext * s, int dquant)
s->c_dc_scale= s->c_dc_scale_table[ s->qscale ]; 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) 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; int a, b, c, wrap, pred, scale;
@ -1856,6 +1874,11 @@ static inline int ff_mpeg4_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_pt
return pred; return pred;
} }
/**
* 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, void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
int dir) int dir)
{ {
@ -1954,6 +1977,10 @@ static void mpeg4_inv_pred_ac(MpegEncContext * s, DCTELEM *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) static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
{ {
#if 1 #if 1
@ -1995,6 +2022,10 @@ static inline void mpeg4_encode_dc(PutBitContext * s, int level, int n)
#endif #endif
} }
#ifdef CONFIG_ENCODERS #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, static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n, int intra_dc,
UINT8 *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb) UINT8 *scan_table, PutBitContext *dc_pb, PutBitContext *ac_pb)
{ {
@ -2626,6 +2657,7 @@ 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 * @param n either 0 for the x component or 1 for y
* @returns the average MV for a GMC MB * @returns the average MV for a GMC MB
*/ */
@ -3591,6 +3623,12 @@ not_coded:
return 0; 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) static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
{ {
int level, pred, code; int level, pred, code;
@ -4476,6 +4514,10 @@ static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
return 0; 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){ static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
char buf[256]; char buf[256];
int i; int i;