static av_cold int decode_init(AVCodecContext *avctx)
{
HYuvContext *s = avctx->priv_data;
int ret;
ff_huffyuvdsp_init(&s->hdsp);
memset(s->vlc, 0, 4 * sizeof(VLC));
s->interlaced = avctx->height > 288;
s->bgr32 = 1;
if (avctx->extradata_size) {
if ((avctx->bits_per_coded_sample & 7) &&
avctx->bits_per_coded_sample != 12)
s->version = 1; // do such files exist at all?
else if (avctx->extradata_size > 3 && avctx->extradata[3] == 0)
s->version = 2;
else
s->version = 3;
} else
s->version = 0;
s->bps = 8;
s->n = 1<<s->bps;
s->vlc_n = FFMIN(s->n, MAX_VLC_N);
s->chroma = 1;
if (s->version >= 2) {
int method, interlace;
if (avctx->extradata_size < 4)
return AVERROR_INVALIDDATA;
method = avctx->extradata[0];
s->decorrelate = method & 64 ? 1 : 0;
s->predictor = method & 63;
if (s->version == 2) {
s->bitstream_bpp = avctx->extradata[1];
if (s->bitstream_bpp == 0)
s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
} else {
s->bps = (avctx->extradata[1] >> 4) + 1;
s->n = 1<<s->bps;
s->vlc_n = FFMIN(s->n, MAX_VLC_N);
s->chroma_h_shift = avctx->extradata[1] & 3;
s->chroma_v_shift = (avctx->extradata[1] >> 2) & 3;
s->yuv = !!(avctx->extradata[2] & 1);
s->chroma= !!(avctx->extradata[2] & 3);
s->alpha = !!(avctx->extradata[2] & 4);
}
interlace = (avctx->extradata[2] & 0x30) >> 4;
s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
s->context = avctx->extradata[2] & 0x40 ? 1 : 0;
if ((ret = read_huffman_tables(s, avctx->extradata + 4,
avctx->extradata_size - 4)) < 0)
return ret;
} else {
static av_cold int decode_init(AVCodecContext *avctx)
{
HYuvContext *s = avctx->priv_data;
int ret;
ff_huffyuv_common_init(avctx);
ff_huffyuvdsp_init(&s->hdsp);
memset(s->vlc, 0, 3 * sizeof(VLC));
s->interlaced = s->height > 288;
s->bgr32 = 1;
if (avctx->extradata_size) {
if ((avctx->bits_per_coded_sample & 7) &&
avctx->bits_per_coded_sample != 12)
s->version = 1; // do such files exist at all?
else
s->version = 2;
} else
s->version = 0;
if (s->version == 2) {
int method, interlace;
if (avctx->extradata_size < 4)
return AVERROR_INVALIDDATA;
method = avctx->extradata[0];
s->decorrelate = method & 64 ? 1 : 0;
s->predictor = method & 63;
s->bitstream_bpp = avctx->extradata[1];
if (s->bitstream_bpp == 0)
s->bitstream_bpp = avctx->bits_per_coded_sample & ~7;
interlace = (avctx->extradata[2] & 0x30) >> 4;
s->interlaced = (interlace == 1) ? 1 : (interlace == 2) ? 0 : s->interlaced;
s->context = avctx->extradata[2] & 0x40 ? 1 : 0;
if ((ret = read_huffman_tables(s, avctx->extradata + 4,
avctx->extradata_size - 4)) < 0)
return ret;
} else {
