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fixed NTSC end of line bug

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Originally committed as revision 1014 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2002-10-08 17:54:02 +00:00
parent 789587d595
commit 1c05e11d02
1 changed files with 25 additions and 4 deletions
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29
libavcodec/dv.c
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@ -448,16 +448,37 @@ static inline void dv_decode_video_segment(DVVideoDecodeContext *s,
for(j = 0;j < 6; j++) {
idct_put = s->idct_put[mb->dct_mode];
if (j < 4) {
if (s->sampling_411) {
if (s->sampling_411 && mb_x < (704 / 8)) {
/* NOTE: at end of line, the macroblock is handled as 420 */
idct_put(y_ptr + (j * 8), s->linesize[0], block);
} else {
idct_put(y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->linesize[0]),
s->linesize[0], block);
}
} else {
/* don't ask me why they inverted Cb and Cr ! */
idct_put(s->current_picture[6 - j] + c_offset,
s->linesize[6 - j], block);
if (s->sampling_411 && mb_x >= (704 / 8)) {
uint8_t pixels[64], *c_ptr, *c_ptr1, *ptr;
int y, linesize;
/* NOTE: at end of line, the macroblock is handled as 420 */
idct_put(pixels, 8, block);
linesize = s->linesize[6 - j];
c_ptr = s->current_picture[6 - j] + c_offset;
ptr = pixels;
for(y = 0;y < 8; y++) {
/* convert to 411P */
c_ptr1 = c_ptr + linesize;
c_ptr1[0] = c_ptr[0] = (ptr[0] + ptr[1]) >> 1;
c_ptr1[1] = c_ptr[1] = (ptr[2] + ptr[3]) >> 1;
c_ptr1[2] = c_ptr[2] = (ptr[4] + ptr[5]) >> 1;
c_ptr1[3] = c_ptr[3] = (ptr[6] + ptr[7]) >> 1;
c_ptr += linesize * 2;
ptr += 8;
}
} else {
/* don't ask me why they inverted Cb and Cr ! */
idct_put(s->current_picture[6 - j] + c_offset,
s->linesize[6 - j], block);
}
}
block += 64;
mb++;