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mjpegdec: Fill raw huffman tables with default values too

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These may be used by hwaccel decoders when the standard tables are not
otherwise available.  At the same time, clean up that code into an array
so it's a little less repetitive.
This commit is contained in:
Mark Thompson
2018-11-11 16:16:54 +00:00
parent 7a20656474
commit 7ba63695b7
1 changed files with 38 additions and 27 deletions
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65
libavcodec/mjpegdec.c
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@@ -73,34 +73,45 @@ static int build_vlc(VLC *vlc, const uint8_t *bits_table,
huff_code, 2, 2, huff_sym, 2, 2, use_static);
}
static int build_basic_mjpeg_vlc(MJpegDecodeContext *s)
static int init_default_huffman_tables(MJpegDecodeContext *s)
{
int ret;
static const struct {
int class;
int index;
const uint8_t *bits;
const uint8_t *values;
int codes;
int length;
} ht[] = {
{ 0, 0, avpriv_mjpeg_bits_dc_luminance,
avpriv_mjpeg_val_dc, 12, 12 },
{ 0, 1, avpriv_mjpeg_bits_dc_chrominance,
avpriv_mjpeg_val_dc, 12, 12 },
{ 1, 0, avpriv_mjpeg_bits_ac_luminance,
avpriv_mjpeg_val_ac_luminance, 251, 162 },
{ 1, 1, avpriv_mjpeg_bits_ac_chrominance,
avpriv_mjpeg_val_ac_chrominance, 251, 162 },
{ 2, 0, avpriv_mjpeg_bits_ac_luminance,
avpriv_mjpeg_val_ac_luminance, 251, 162 },
{ 2, 1, avpriv_mjpeg_bits_ac_chrominance,
avpriv_mjpeg_val_ac_chrominance, 251, 162 },
};
int i, ret;
if ((ret = build_vlc(&s->vlcs[0][0], avpriv_mjpeg_bits_dc_luminance,
avpriv_mjpeg_val_dc, 12, 0, 0)) < 0)
return ret;
if ((ret = build_vlc(&s->vlcs[0][1], avpriv_mjpeg_bits_dc_chrominance,
avpriv_mjpeg_val_dc, 12, 0, 0)) < 0)
return ret;
if ((ret = build_vlc(&s->vlcs[1][0], avpriv_mjpeg_bits_ac_luminance,
avpriv_mjpeg_val_ac_luminance, 251, 0, 1)) < 0)
return ret;
if ((ret = build_vlc(&s->vlcs[1][1], avpriv_mjpeg_bits_ac_chrominance,
avpriv_mjpeg_val_ac_chrominance, 251, 0, 1)) < 0)
return ret;
if ((ret = build_vlc(&s->vlcs[2][0], avpriv_mjpeg_bits_ac_luminance,
avpriv_mjpeg_val_ac_luminance, 251, 0, 0)) < 0)
return ret;
if ((ret = build_vlc(&s->vlcs[2][1], avpriv_mjpeg_bits_ac_chrominance,
avpriv_mjpeg_val_ac_chrominance, 251, 0, 0)) < 0)
return ret;
for (i = 0; i < FF_ARRAY_ELEMS(ht); i++) {
ret = build_vlc(&s->vlcs[ht[i].class][ht[i].index],
ht[i].bits, ht[i].values, ht[i].codes,
0, ht[i].class == 1);
if (ret < 0)
return ret;
if (ht[i].class < 2) {
memcpy(s->raw_huffman_lengths[ht[i].class][ht[i].index],
ht[i].bits + 1, 16);
memcpy(s->raw_huffman_values[ht[i].class][ht[i].index],
ht[i].values, ht[i].length);
}
}
return 0;
}
@@ -151,7 +162,7 @@ av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
avctx->colorspace = AVCOL_SPC_BT470BG;
s->hwaccel_pix_fmt = s->hwaccel_sw_pix_fmt = AV_PIX_FMT_NONE;
if ((ret = build_basic_mjpeg_vlc(s)) < 0)
if ((ret = init_default_huffman_tables(s)) < 0)
return ret;
if (s->extern_huff) {
@@ -161,7 +172,7 @@ av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
if (ff_mjpeg_decode_dht(s)) {
av_log(avctx, AV_LOG_ERROR,
"error using external huffman table, switching back to internal\n");
build_basic_mjpeg_vlc(s);
init_default_huffman_tables(s);
}
}
if (avctx->field_order == AV_FIELD_BB) { /* quicktime icefloe 019 */