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libavcodec/dnxhd: Enable 12-bit DNxHR support.

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10- and 12-bit DNxHR use the same DC coefficient decoding process and
VLC table, just with a different shift value. From SMPTE 2019-1:2016,
8.2.4 DC Coefficient Decoding:

"For 8-bit video sampling, the maximum value of η=11 and for
10-/12-bit video sampling, the maximum value of η=13."

A sample file will be uploaded to show that with this patch, things
decode correctly:
dnxhr_hqx_12bit_1080p_smpte_colorbars_davinci_resolve.mov

Signed-off-by: Steven Robertson <steven@strobe.cc>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Steven Robertson 2016-08-01 23:26:12 -07:00 • committed by Michael Niedermayer
parent 708d9e9fba
commit e1be80aa11
1 changed files with 1 additions and 6 deletions
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7
libavcodec/dnxhddec.c
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@ -119,11 +119,6 @@ static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid, int bitdepth)
av_log(ctx->avctx, AV_LOG_ERROR, "bit depth mismatches %d %d\n", ff_dnxhd_cid_table[index].bit_depth, bitdepth);
return AVERROR_INVALIDDATA;
}
if (bitdepth > 10) {
avpriv_request_sample(ctx->avctx, "DNXHR 12-bit");
if (ctx->avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL)
return AVERROR_PATCHWELCOME;
}
ctx->cid_table = &ff_dnxhd_cid_table[index];
av_log(ctx->avctx, AV_LOG_VERBOSE, "Profile cid %d.\n", cid);
@ -134,7 +129,7 @@ static int dnxhd_init_vlc(DNXHDContext *ctx, uint32_t cid, int bitdepth)
init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
ctx->cid_table->ac_bits, 1, 1,
ctx->cid_table->ac_codes, 2, 2, 0);
init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, bitdepth + 4,
init_vlc(&ctx->dc_vlc, DNXHD_DC_VLC_BITS, bitdepth > 8 ? 14 : 12,
ctx->cid_table->dc_bits, 1, 1,
ctx->cid_table->dc_codes, 1, 1, 0);
init_vlc(&ctx->run_vlc, DNXHD_VLC_BITS, 62,