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optional non spec compliant optimizations

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Originally committed as revision 3429 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-09-02 15:30:46 +00:00
parent bf0669aa87
commit 6fc5b059b8
3 changed files with 87 additions and 11 deletions
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3
ffplay.c
View File

@ -170,6 +170,7 @@ static int debug_mv = 0;
static int step = 0;
static int thread_count = 1;
static int workaround_bugs = 1;
static int fast = 0;
/* current context */
static int is_full_screen;
@ -1172,6 +1173,7 @@ static int stream_component_open(VideoState *is, int stream_index)
enc->debug_mv = debug_mv;
enc->debug = debug;
enc->workaround_bugs = workaround_bugs;
if(fast) enc->flags2 |= CODEC_FLAG2_FAST;
if (!codec ||
avcodec_open(enc, codec) < 0)
return -1;
@ -1829,6 +1831,7 @@ const OptionDef options[] = {
{ "debug", HAS_ARG | OPT_EXPERT, {(void*)opt_debug}, "print specific debug info", "" },
{ "bug", OPT_INT | HAS_ARG | OPT_EXPERT, {(void*)&workaround_bugs}, "workaround bugs", "" },
{ "vismv", HAS_ARG | OPT_EXPERT, {(void*)opt_vismv}, "visualize motion vectors", "" },
{ "fast", OPT_BOOL | OPT_EXPERT, {(void*)&fast}, "non spec compliant optimizations", "" },
#ifdef CONFIG_NETWORK
{ "rtp_tcp", OPT_EXPERT, {(void*)&opt_rtp_tcp}, "force RTP/TCP protocol usage", "" },
#endif

2
libavcodec/avcodec.h
View File

@ -283,6 +283,8 @@ extern int motion_estimation_method;
#define CODEC_FLAG_INTERLACED_ME 0x20000000 ///< interlaced motion estimation
#define CODEC_FLAG_SVCD_SCAN_OFFSET 0x40000000 ///< will reserve space for SVCD scan offset user data
#define CODEC_FLAG_CLOSED_GOP 0x80000000
#define CODEC_FLAG2_FAST 0x00000001 ///< allow non spec compliant speedup tricks
/* Unsupported options :
* Syntax Arithmetic coding (SAC)
* Reference Picture Selection

75
libavcodec/mpeg12.c
View File

@ -70,6 +70,7 @@ static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
DCTELEM *block,
int n);
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n);
static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred);
static void exchange_uv(MpegEncContext *s);
@ -1358,6 +1359,16 @@ static int mpeg_decode_mb(MpegEncContext *s,
#endif
if (s->codec_id == CODEC_ID_MPEG2VIDEO) {
if(s->flags2 & CODEC_FLAG2_FAST){
for(i=0;i<6;i++) {
if(cbp & 32) {
mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i);
} else {
s->block_last_index[i] = -1;
}
cbp+=cbp;
}
}else{
cbp<<= 12-mb_block_count;
for(i=0;i<mb_block_count;i++) {
@ -1369,6 +1380,7 @@ static int mpeg_decode_mb(MpegEncContext *s,
}
cbp+=cbp;
}
}
} else {
for(i=0;i<6;i++) {
if (cbp & 32) {
@ -1592,8 +1604,6 @@ static inline int mpeg1_decode_block_inter(MpegEncContext *s,
return 0;
}
/* Also does unquantization here, since I will never support mpeg2
encoding */
static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
DCTELEM *block,
int n)
@ -1673,6 +1683,67 @@ static inline int mpeg2_decode_block_non_intra(MpegEncContext *s,
return 0;
}
static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s,
DCTELEM *block,
int n)
{
int level, i, j, run;
RLTable *rl = &rl_mpeg1;
uint8_t * const scantable= s->intra_scantable.permutated;
const int qscale= s->qscale;
int v;
OPEN_READER(re, &s->gb);
i = -1;
/* special case for the first coef. no need to add a second vlc table */
UPDATE_CACHE(re, &s->gb);
v= SHOW_UBITS(re, &s->gb, 2);
if (v & 2) {
LAST_SKIP_BITS(re, &s->gb, 2);
level= (3*qscale)>>1;
if(v&1)
level= -level;
block[0] = level;
i++;
}
/* now quantify & encode AC coefs */
for(;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2);
if(level == 127){
break;
} else if(level != 0) {
i += run;
j = scantable[i];
level= ((level*2+1)*qscale)>>1;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
} else {
/* escape */
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
UPDATE_CACHE(re, &s->gb);
level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12);
i += run;
j = scantable[i];
if(level<0){
level= ((-level*2+1)*qscale)>>1;
level= -level;
}else{
level= ((level*2+1)*qscale)>>1;
}
}
block[j] = level;
}
CLOSE_READER(re, &s->gb);
s->block_last_index[n] = i;
return 0;
}
static inline int mpeg2_decode_block_intra(MpegEncContext *s,
DCTELEM *block,
int n)