xenia-project/FFmpeg
1
0
Fork 0
mirror of https://github.com/xenia-project/FFmpeg.git synced 2025-02-19 03:20:12 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Simplification of how dct_mode affects decoding.

Browse Source 
Originally committed as revision 14996 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Roman Shaposhnik 2008-08-27 20:17:01 +00:00
parent 0dbddda397
commit 7ae6dcb595
1 changed files with 8 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
libavcodec/dv.c
View File

@ -247,7 +247,7 @@ typedef struct BlockInfo {
const uint32_t *factor_table;
const uint8_t *scan_table;
uint8_t pos; /* position in block */
uint8_t dct_mode;
void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
uint8_t partial_bit_count;
uint16_t partial_bit_buffer;
int shift_offset;
@ -352,7 +352,6 @@ static inline void dv_decode_video_segment(DVVideoContext *s,
DCTELEM *block, *block1;
int c_offset;
uint8_t *y_ptr;
void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
const uint8_t *buf_ptr;
PutBitContext pb, vs_pb;
GetBitContext gb;
@ -386,7 +385,7 @@ static inline void dv_decode_video_segment(DVVideoContext *s,
/* get the dc */
dc = get_sbits(&gb, 9);
dct_mode = get_bits1(&gb);
mb->dct_mode = dct_mode;
mb->idct_put = s->idct_put[dct_mode && log2_blocksize==3];
mb->scan_table = s->dv_zigzag[dct_mode];
class1 = get_bits(&gb, 2);
mb->factor_table = s->dv_idct_factor[class1 == 3][dct_mode]
@ -471,15 +470,14 @@ static inline void dv_decode_video_segment(DVVideoContext *s,
(mb_x>>((s->sys->pix_fmt == PIX_FMT_YUV411P)?2:1)))<<log2_blocksize);
for(j = 0;j < 6; j++) {
idct_put = s->idct_put[mb->dct_mode && log2_blocksize==3];
if (s->sys->pix_fmt == PIX_FMT_YUV422P) { /* 4:2:2 */
if (j == 0 || j == 2) {
/* Y0 Y1 */
idct_put(y_ptr + ((j >> 1)<<log2_blocksize),
mb->idct_put(y_ptr + ((j >> 1)<<log2_blocksize),
s->picture.linesize[0], block);
} else if(j > 3) {
/* Cr Cb */
idct_put(s->picture.data[6 - j] + c_offset,
mb->idct_put(s->picture.data[6 - j] + c_offset,
s->picture.linesize[6 - j], block);
}
/* note: j=1 and j=3 are "dummy" blocks in 4:2:2 */
@ -487,9 +485,9 @@ static inline void dv_decode_video_segment(DVVideoContext *s,
if (j < 4) {
if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {
/* NOTE: at end of line, the macroblock is handled as 420 */
idct_put(y_ptr + (j<<log2_blocksize), s->picture.linesize[0], block);
mb->idct_put(y_ptr + (j<<log2_blocksize), s->picture.linesize[0], block);
} else {
idct_put(y_ptr + (((j & 1) + (j >> 1) * s->picture.linesize[0])<<log2_blocksize),
mb->idct_put(y_ptr + (((j & 1) + (j >> 1) * s->picture.linesize[0])<<log2_blocksize),
s->picture.linesize[0], block);
}
} else {
@ -499,7 +497,7 @@ static inline void dv_decode_video_segment(DVVideoContext *s,
uint8_t *c_ptr, *c_ptr1, *ptr, *ptr1;
int x, y, linesize;
/* NOTE: at end of line, the macroblock is handled as 420 */
idct_put(pixels, 8, block);
mb->idct_put(pixels, 8, block);
linesize = s->picture.linesize[6 - j];
c_ptr = s->picture.data[6 - j] + c_offset;
ptr = pixels;
@ -514,7 +512,7 @@ static inline void dv_decode_video_segment(DVVideoContext *s,
}
} else {
/* don't ask me why they inverted Cb and Cr ! */
idct_put(s->picture.data[6 - j] + c_offset,
mb->idct_put(s->picture.data[6 - j] + c_offset,
s->picture.linesize[6 - j], block);
}
}