static av_cold int jpg_init(AVCodecContext *avctx, JPGContext *c)
{
int ret;
ret = build_vlc(&c->dc_vlc[0], avpriv_mjpeg_bits_dc_luminance,
avpriv_mjpeg_val_dc, 12, 0);
if (ret)
return ret;
ret = build_vlc(&c->dc_vlc[1], avpriv_mjpeg_bits_dc_chrominance,
avpriv_mjpeg_val_dc, 12, 0);
if (ret)
return ret;
ret = build_vlc(&c->ac_vlc[0], avpriv_mjpeg_bits_ac_luminance,
avpriv_mjpeg_val_ac_luminance, 251, 1);
if (ret)
return ret;
ret = build_vlc(&c->ac_vlc[1], avpriv_mjpeg_bits_ac_chrominance,
avpriv_mjpeg_val_ac_chrominance, 251, 1);
if (ret)
return ret;
ff_dsputil_init(&c->dsp, avctx);
ff_init_scantable(c->dsp.idct_permutation, &c->scantable,
ff_zigzag_direct);
return 0;
}
int build_dec_vlc(jpeg_ctx_t *ctx)
{
int ret;
if (ctx->is_std_vlc[0][0] == 0)
{
ret = build_vlc(&ctx->dec_vlcs[0][0], ctx->dht_dc[0].len, ctx->dht_dc[0].val, 12, 0);
if (ret != 0)
return -1;
}
else
ctx->dec_vlcs[0][0].table = ctx->std_dec_vlcs[0][0].table;
if (ctx->is_std_vlc[0][1] == 0)
{
ret = build_vlc(&ctx->dec_vlcs[0][1], ctx->dht_dc[1].len, ctx->dht_dc[1].val, 12, 0);
if (ret != 0)
return -1;
}
else
ctx->dec_vlcs[0][1].table = ctx->std_dec_vlcs[0][1].table;
if (ctx->is_std_vlc[1][0] == 0)
{
ret = build_vlc(&ctx->dec_vlcs[1][0], ctx->dht_ac[0].len, ctx->dht_ac[0].val, 251, 1);
if (ret != 0)
return -1;
}
else
ctx->dec_vlcs[1][0].table = ctx->std_dec_vlcs[1][0].table;
if (ctx->is_std_vlc[1][1] == 0)
{
ret = build_vlc(&ctx->dec_vlcs[1][1], ctx->dht_ac[1].len, ctx->dht_ac[1].val, 251, 1);
if (ret != 0)
return -1;
}
else
ctx->dec_vlcs[1][1].table = ctx->std_dec_vlcs[1][1].table;
return 0;
}
int build_std_dec_vlc(jpeg_ctx_t *ctx)
{
int ret;
ret = build_vlc(&ctx->std_dec_vlcs[0][0], std_huffman_bits_dc_luminance, std_huffman_val_dc, 12, 0);
if (ret != 0)
return -1;
ret = build_vlc(&ctx->std_dec_vlcs[0][1], std_huffman_bits_dc_chrominance, std_huffman_val_dc, 12, 0);
if (ret != 0)
return -1;
ret = build_vlc(&ctx->std_dec_vlcs[1][0], std_huffman_bits_ac_luminance, std_huffman_val_ac_luminance, 251, 1);
if (ret != 0)
return -1;
ret = build_vlc(&ctx->std_dec_vlcs[1][1], std_huffman_bits_ac_chrominance, std_huffman_val_ac_chrominance, 251, 1);
if (ret != 0)
return -1;
return 0;
}
