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FFmpeg/libavcodec/msmpeg4.c
wm4 f6774f905f mpegvideo: operate with pointers to AVFrames instead of whole structs 
The most interesting parts are initialization in ff_MPV_common_init() and
uninitialization in ff_MPV_common_end().

ff_mpeg_unref_picture and ff_thread_release_buffer have additional NULL
checks for Picture.f, because these functions can be called on
uninitialized or partially initialized Pictures.

NULL pointer checks are added to ff_thread_release_buffer() stub function.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
2014-04-09 02:12:19 +02:00

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/*
* MSMPEG4 backend for encoder and decoder
* Copyright (c) 2001 Fabrice Bellard
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* MSMPEG4 backend for encoder and decoder
*/
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "msmpeg4.h"
#include "libavutil/x86/asm.h"
#include "h263.h"
#include "mpeg4video.h"
#include "msmpeg4data.h"
#include "vc1data.h"
/*
* You can also call this codec : MPEG4 with a twist !
*
* TODO:
* - (encoding) select best mv table (two choices)
* - (encoding) select best vlc/dc table
*/
/* This table is practically identical to the one from h263
* except that it is inverted. */
static av_cold void init_h263_dc_for_msmpeg4(void)
{
int level, uni_code, uni_len;
for(level=-256; level<256; level++){
int size, v, l;
/* find number of bits */
size = 0;
v = abs(level);
while (v) {
v >>= 1;
size++;
}
if (level < 0)
l= (-level) ^ ((1 << size) - 1);
else
l= level;
/* luminance h263 */
uni_code= ff_mpeg4_DCtab_lum[size][0];
uni_len = ff_mpeg4_DCtab_lum[size][1];
uni_code ^= (1<<uni_len)-1; //M$ does not like compatibility
if (size > 0) {
uni_code<<=size; uni_code|=l;
uni_len+=size;
if (size > 8){
uni_code<<=1; uni_code|=1;
uni_len++;
}
}
ff_v2_dc_lum_table[level + 256][0] = uni_code;
ff_v2_dc_lum_table[level + 256][1] = uni_len;
/* chrominance h263 */
uni_code= ff_mpeg4_DCtab_chrom[size][0];
uni_len = ff_mpeg4_DCtab_chrom[size][1];
uni_code ^= (1<<uni_len)-1; //M$ does not like compatibility
if (size > 0) {
uni_code<<=size; uni_code|=l;
uni_len+=size;
if (size > 8){
uni_code<<=1; uni_code|=1;
uni_len++;
}
}
ff_v2_dc_chroma_table[level + 256][0] = uni_code;
ff_v2_dc_chroma_table[level + 256][1] = uni_len;
}
}
av_cold void ff_msmpeg4_common_init(MpegEncContext *s)
{
static int initialized=0;
switch(s->msmpeg4_version){
case 1:
case 2:
s->y_dc_scale_table=
s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
break;
case 3:
if(s->workaround_bugs){
s->y_dc_scale_table= ff_old_ff_y_dc_scale_table;
s->c_dc_scale_table= ff_wmv1_c_dc_scale_table;
} else{
s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
}
break;
case 4:
case 5:
s->y_dc_scale_table= ff_wmv1_y_dc_scale_table;
s->c_dc_scale_table= ff_wmv1_c_dc_scale_table;
break;
#if CONFIG_VC1_DECODER
case 6:
s->y_dc_scale_table= ff_wmv3_dc_scale_table;
s->c_dc_scale_table= ff_wmv3_dc_scale_table;
break;
#endif
}
if(s->msmpeg4_version>=4){
ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_wmv1_scantable[1]);
ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_wmv1_scantable[2]);
ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_wmv1_scantable[3]);
ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_wmv1_scantable[0]);
}
//Note the default tables are set in common_init in mpegvideo.c
if(!initialized){
initialized=1;
init_h263_dc_for_msmpeg4();
}
}
/* predict coded block */
int ff_msmpeg4_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)
{
int xy, wrap, pred, a, b, c;
xy = s->block_index[n];
wrap = s->b8_stride;
/* B C
* A X
*/
a = s->coded_block[xy - 1 ];
b = s->coded_block[xy - 1 - wrap];
c = s->coded_block[xy - wrap];
if (b == c) {
pred = a;
} else {
pred = c;
}
/* store value */
*coded_block_ptr = &s->coded_block[xy];
return pred;
}
static int get_dc(uint8_t *src, int stride, int scale)
{
int y;
int sum=0;
for(y=0; y<8; y++){
int x;
for(x=0; x<8; x++){
sum+=src[x + y*stride];
}
}
return FASTDIV((sum + (scale>>1)), scale);
}
/* dir = 0: left, dir = 1: top prediction */
int ff_msmpeg4_pred_dc(MpegEncContext *s, int n,
int16_t **dc_val_ptr, int *dir_ptr)
{
int a, b, c, wrap, pred, scale;
int16_t *dc_val;
/* find prediction */
if (n < 4) {
scale = s->y_dc_scale;
} else {
scale = s->c_dc_scale;
}
wrap = s->block_wrap[n];
dc_val= s->dc_val[0] + s->block_index[n];
/* B C
* A X
*/
a = dc_val[ - 1];
b = dc_val[ - 1 - wrap];
c = dc_val[ - wrap];
if(s->first_slice_line && (n&2)==0 && s->msmpeg4_version<4){
b=c=1024;
}
/* XXX: the following solution consumes divisions, but it does not
necessitate to modify mpegvideo.c. The problem comes from the
fact they decided to store the quantized DC (which would lead
to problems if Q could vary !) */
#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE
__asm__ volatile(
"movl %3, %%eax \n\t"
"shrl $1, %%eax \n\t"
"addl %%eax, %2 \n\t"
"addl %%eax, %1 \n\t"
"addl %0, %%eax \n\t"
"mull %4 \n\t"
"movl %%edx, %0 \n\t"
"movl %1, %%eax \n\t"
"mull %4 \n\t"
"movl %%edx, %1 \n\t"
"movl %2, %%eax \n\t"
"mull %4 \n\t"
"movl %%edx, %2 \n\t"
: "+b" (a), "+c" (b), "+D" (c)
: "g" (scale), "S" (ff_inverse[scale])
: "%eax", "%edx"
);
#else
/* Divisions are costly everywhere; optimize the most common case. */
if (scale == 8) {
a = (a + (8 >> 1)) / 8;
b = (b + (8 >> 1)) / 8;
c = (c + (8 >> 1)) / 8;
} else {
a = FASTDIV((a + (scale >> 1)), scale);
b = FASTDIV((b + (scale >> 1)), scale);
c = FASTDIV((c + (scale >> 1)), scale);
}
#endif
/* XXX: WARNING: they did not choose the same test as MPEG4. This
is very important ! */
if(s->msmpeg4_version>3){
if(s->inter_intra_pred){
uint8_t *dest;
int wrap;
if(n==1){
pred=a;
*dir_ptr = 0;
}else if(n==2){
pred=c;
*dir_ptr = 1;
}else if(n==3){
if (abs(a - b) < abs(b - c)) {
pred = c;
*dir_ptr = 1;
} else {
pred = a;
*dir_ptr = 0;
}
}else{
if(n<4){
wrap= s->linesize;
dest= s->current_picture.f->data[0] + (((n >> 1) + 2*s->mb_y) * 8* wrap ) + ((n & 1) + 2*s->mb_x) * 8;
}else{
wrap= s->uvlinesize;
dest= s->current_picture.f->data[n - 3] + (s->mb_y * 8 * wrap) + s->mb_x * 8;
}
if(s->mb_x==0) a= (1024 + (scale>>1))/scale;
else a= get_dc(dest-8, wrap, scale*8);
if(s->mb_y==0) c= (1024 + (scale>>1))/scale;
else c= get_dc(dest-8*wrap, wrap, scale*8);
if (s->h263_aic_dir==0) {
pred= a;
*dir_ptr = 0;
}else if (s->h263_aic_dir==1) {
if(n==0){
pred= c;
*dir_ptr = 1;
}else{
pred= a;
*dir_ptr = 0;
}
}else if (s->h263_aic_dir==2) {
if(n==0){
pred= a;
*dir_ptr = 0;
}else{
pred= c;
*dir_ptr = 1;
}
} else {
pred= c;
*dir_ptr = 1;
}
}
}else{
if (abs(a - b) < abs(b - c)) {
pred = c;
*dir_ptr = 1;
} else {
pred = a;
*dir_ptr = 0;
}
}
}else{
if (abs(a - b) <= abs(b - c)) {
pred = c;
*dir_ptr = 1;
} else {
pred = a;
*dir_ptr = 0;
}
}
/* update predictor */
*dc_val_ptr = &dc_val[0];
return pred;
}
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