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Parse frame size code, see "svq3.c: parse frame size" thread on ML.

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Originally committed as revision 19583 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje 2009-08-04 21:55:47 +00:00
parent 73f04f5e7d
commit faccfeec0e
1 changed files with 14 additions and 3 deletions
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17
libavcodec/svq3.c
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@ -819,14 +819,25 @@ static av_cold int svq3_decode_init(AVCodecContext *avctx)
if (extradata && !memcmp(extradata, "SEQH", 4)) {
GetBitContext gb;
int frame_size_code;
size = AV_RB32(&extradata[4]);
init_get_bits(&gb, extradata + 8, size*8);
/* 'frame size code' and optional 'width, height' */
if (get_bits(&gb, 3) == 7) {
skip_bits(&gb, 12);
skip_bits(&gb, 12);
frame_size_code = get_bits(&gb, 3);
switch (frame_size_code) {
case 0: avctx->width = 160; avctx->height = 120; break;
case 1: avctx->width = 128; avctx->height = 96; break;
case 2: avctx->width = 176; avctx->height = 144; break;
case 3: avctx->width = 352; avctx->height = 288; break;
case 4: avctx->width = 704; avctx->height = 576; break;
case 5: avctx->width = 240; avctx->height = 180; break;
case 6: avctx->width = 320; avctx->height = 240; break;
case 7:
avctx->width = get_bits(&gb, 12);
avctx->height = get_bits(&gb, 12);
break;
}
h->halfpel_flag = get_bits1(&gb);