/**
* @file intrax8.c
- * @brief IntraX8 (J-Frame) sub-decoder, used by wmv2 and vc1
+ * @brief IntraX8 (J-Frame) subdecoder, used by WMV2 and VC-1
*/
#include "avcodec.h"
1)
//set ac tables
for(i=0;i<8;i++){
- init_ac_vlc( j_ac_vlc[0][0][i], ff_x8_ac0_highquant_table[i][0] );
- init_ac_vlc( j_ac_vlc[0][1][i], ff_x8_ac1_highquant_table[i][0] );
- init_ac_vlc( j_ac_vlc[1][0][i], ff_x8_ac0_lowquant_table [i][0] );
- init_ac_vlc( j_ac_vlc[1][1][i], ff_x8_ac1_lowquant_table [i][0] );
+ init_ac_vlc( j_ac_vlc[0][0][i], x8_ac0_highquant_table[i][0] );
+ init_ac_vlc( j_ac_vlc[0][1][i], x8_ac1_highquant_table[i][0] );
+ init_ac_vlc( j_ac_vlc[1][0][i], x8_ac0_lowquant_table [i][0] );
+ init_ac_vlc( j_ac_vlc[1][1][i], x8_ac1_lowquant_table [i][0] );
}
#undef init_ac_vlc
&src[0],4,2, \
1);
for(i=0;i<8;i++){
- init_dc_vlc( j_dc_vlc[0][i], ff_x8_dc_highquant_table[i][0]);
- init_dc_vlc( j_dc_vlc[1][i], ff_x8_dc_lowquant_table [i][0]);
+ init_dc_vlc( j_dc_vlc[0][i], x8_dc_highquant_table[i][0]);
+ init_dc_vlc( j_dc_vlc[1][i], x8_dc_lowquant_table [i][0]);
}
#undef init_dc_vlc
&src[0],4,2, \
1);
for(i=0;i<2;i++){
- init_or_vlc( j_orient_vlc[0][i], ff_x8_orient_highquant_table[i][0]);
+ init_or_vlc( j_orient_vlc[0][i], x8_orient_highquant_table[i][0]);
}
for(i=0;i<4;i++){
- init_or_vlc( j_orient_vlc[1][i], ff_x8_orient_lowquant_table [i][0])
+ init_or_vlc( j_orient_vlc[1][i], x8_orient_lowquant_table [i][0])
}
}
#undef init_or_vlc
-static inline void x8_reset_vlc_tables(IntraX8Context * w){
+static void x8_reset_vlc_tables(IntraX8Context * w){
memset(w->j_dc_vlc,0,sizeof(w->j_dc_vlc));
memset(w->j_ac_vlc,0,sizeof(w->j_ac_vlc));
w->j_orient_vlc=NULL;
i==20-21 r=0-1 l=2 ;r=i& %00001
i==22 r=0 l=3 ;r=i& %00000
l=lut_l[i/2]={0,0,0,0,0,0,0,0,1,1,2,3}[i>>1];// 11 10'01 01'00 00'00 00'00 00'00 00 => 0xE50000
-t=lut_mask[l]={0x0f,0x03,0x01,0x00}[l]; as i<256 the higher bits doesn't matter */
+t=lut_mask[l]={0x0f,0x03,0x01,0x00}[l]; as i<256 the higher bits do not matter */
l=(0xE50000>>(i&(0x1E)))&3;/*0x1E or (~1) or ((i>>1)<<1)*/
t=(0x01030F>>(l<<3));
int sum;
int quant;
- s->dsp.x8_setup_spacial_compensation(s->dest[chroma], s->edge_emu_buffer,
+ s->dsp.x8_setup_spatial_compensation(s->dest[chroma], s->edge_emu_buffer,
s->current_picture.linesize[chroma>0],
&range, &sum, w->edges);
if(chroma){
w->flat_dc=0;
if(range < quant || range < 3){
w->orient=0;
- if(range < 3){//yep you read right, idct error of +-1 may break decoding!
+ if(range < 3){//yep you read right, a +-1 idct error may break decoding!
w->flat_dc=1;
sum+=9;
w->predicted_dc = (sum*6899)>>17;//((1<<17)+9)/(8+8+1+2)=6899
w->orient = 0;
return;
}
- //no edge cases.
+ //no edge cases
b= w->prediction_table[2*s->mb_x + !(s->mb_y&1) ];//block[x ][y-1]
a= w->prediction_table[2*s->mb_x-2 + (s->mb_y&1) ];//block[x-1][y ]
c= w->prediction_table[2*s->mb_x-2 + !(s->mb_y&1) ];//block[x-1][y-1]
w->est_run = FFMIN(b,a);
- /*this condition have nothing to do with w->edges, even if it looks similar
- it would triger if e.g. x=3;y=2;
- I guess somebody wrote something wrong and it became standard */
+ /* This condition has nothing to do with w->edges, even if it looks
+ similar it would trigger if e.g. x=3;y=2;
+ I guess somebody wrote something wrong and it became standard. */
if( (s->mb_x & s->mb_y) != 0 ) w->est_run=FFMIN(c,w->est_run);
w->est_run>>=2;
};
static int x8_decode_intra_mb(IntraX8Context* const w, const int chroma){
-MpegEncContext * const s= w->s;
+ MpegEncContext * const s= w->s;
uint8_t * scantable;
int final,run,level;
if(w->flat_dc){
dsp_x8_put_solidcolor(w->predicted_dc, s->dest[chroma], s->current_picture.linesize[!!chroma]);
}else{
- s->dsp.x8_spacial_compensation[w->orient]( s->edge_emu_buffer,
+ s->dsp.x8_spatial_compensation[w->orient]( s->edge_emu_buffer,
s->dest[chroma],
s->current_picture.linesize[!!chroma] );
}
return 0;
}
-static inline void x8_init_block_index(MpegEncContext *s){ //FIXME maybe merge with ff_*
+static void x8_init_block_index(MpegEncContext *s){ //FIXME maybe merge with ff_*
//not s->linesize as this would be wrong for field pics
-//not that IntraX8 have interlace support ;)
+//not that IntraX8 has interlacing support ;)
const int linesize = s->current_picture.linesize[0];
const int uvlinesize= s->current_picture.linesize[1];
ff_init_scantable(s->dsp.idct_permutation, &w->scantable[2], wmv1_scantable[3]);
}
+/**
+ * Destroy IntraX8 frame structure.
+ * @param w pointer to IntraX8Context
+ */
+void ff_intrax8_common_end(IntraX8Context * w)
+{
+ av_freep(&w->prediction_table);
+}
+
/**
* Decode single IntraX8 frame.
* The parent codec must fill s->loopfilter and s->gb (bitstream).
- * The parent codec must call MPV_frame_start(), ff_er_frame_start() before calling this function
+ * The parent codec must call MPV_frame_start(), ff_er_frame_start() before calling this function.
* The parent codec must call ff_er_frame_end(), MPV_frame_end() after calling this function.
* This function does not use MPV_decode_mb().
* lowres decoding is theoretically impossible.
* @param w pointer to IntraX8Context
- * @param dquant doubled quantizer, it would be odd in case of vc1 halfpq==1
- * @param quant_offset offset away from zero.
+ * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
+ * @param quant_offset offset away from zero
*/
//FIXME extern uint8_t wmv3_dc_scale_table[32];
int ff_intrax8_decode_picture(IntraX8Context * const w, int dquant, int quant_offset){
x8_get_prediction_chroma(w);
/*when setting up chroma, no vlc is read,
- so no error condition could be reached*/
+ so no error condition can be reached*/
x8_setup_spatial_predictor(w,1);
if(x8_decode_intra_mb(w,1)) goto error;
projects / ffmpeg / blobdiff