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added 422P and 444P support - fixed block parsing error 

Originally committed as revision 39 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2001-08-06 01:54:05 +00:00
parent d9fea0b588
commit b182e68ac5
1 changed files with 16 additions and 10 deletions
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26
libavcodec/mjpeg.c
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@ -583,12 +583,6 @@ static int mjpeg_decode_sof0(MJpegDecodeContext *s,
s->h_max = s->h_count[i];
if (s->v_count[i] > s->v_max)
s->v_max = s->v_count[i];
#if 1
/* XXX: only 420 is accepted */
if ((i == 0 && (s->h_count[i] != 2 || s->v_count[i] != 2)) ||
(i != 0 && (s->h_count[i] != 1 || s->v_count[i] != 1)))
return -1;
#endif
s->quant_index[i] = get_bits(&s->gb, 8);
if (s->quant_index[i] >= 4)
return -1;
@ -659,7 +653,6 @@ static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
val = val * quant_matrix[0] + s->last_dc[component];
s->last_dc[component] = val;
block[0] = val;
/* AC coefs */
ac_vlc = &s->vlcs[1][ac_index];
i = 1;
@ -688,6 +681,8 @@ static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
j = zigzag_direct[i];
block[j] = level * quant_matrix[j];
i++;
if (i >= 64)
break;
}
}
return 0;
@ -727,7 +722,7 @@ static int mjpeg_decode_sos(MJpegDecodeContext *s,
nb_blocks[i] = s->h_count[index] * s->v_count[index];
h_count[i] = s->h_count[index];
v_count[i] = s->v_count[index];
dc_index[i] = get_bits(&s->gb, 4);
if (dc_index[i] >= 4)
return -1;
@ -882,7 +877,6 @@ static int mjpeg_decode_frame(AVCodecContext *avctx,
case SOS:
mjpeg_decode_sos(s, s->buffer, input_size);
if (s->start_code == EOI) {
/* XXX: YUV420 hardcoded */
for(i=0;i<3;i++) {
picture->data[i] = s->current_picture[i];
picture->linesize[i] = s->linesize[i];
@ -890,7 +884,19 @@ static int mjpeg_decode_frame(AVCodecContext *avctx,
*data_size = sizeof(AVPicture);
avctx->height = s->height;
avctx->width = s->width;
avctx->pix_fmt = PIX_FMT_YUV420P;
/* XXX: not complete test ! */
switch((s->h_count[0] << 4) | s->v_count[0]) {
case 0x11:
avctx->pix_fmt = PIX_FMT_YUV444P;
break;
case 0x21:
avctx->pix_fmt = PIX_FMT_YUV422P;
break;
default:
case 0x22:
avctx->pix_fmt = PIX_FMT_YUV420P;
break;
}
goto the_end;
}
break;