mirror of
https://git.ffmpeg.org/ffmpeg.git
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136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "libavutil/common.h"
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#include "bsf.h"
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#include "bsf_internal.h"
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#include "cbs.h"
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#include "cbs_bsf.h"
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#include "cbs_h264.h"
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#include "h264.h"
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#define NEW_GLOBAL_PIC_INIT_QP 26
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typedef struct H264RedundantPPSContext {
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CBSBSFContext common;
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} H264RedundantPPSContext;
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static int h264_redundant_pps_fixup_pps(H264RedundantPPSContext *ctx,
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CodedBitstreamUnit *unit)
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{
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H264RawPPS *pps;
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int err;
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// The changes we are about to perform affect the parsing process,
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// so we must make sure that the PPS is writable, otherwise the
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// parsing of future slices will be incorrect and even raise errors.
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err = ff_cbs_make_unit_writable(ctx->common.input, unit);
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if (err < 0)
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return err;
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pps = unit->content;
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// Overwrite pic_init_qp with the global value.
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pps->pic_init_qp_minus26 = NEW_GLOBAL_PIC_INIT_QP - 26;
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// Some PPSs have this set, so it must be set in all of them.
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// (Slices which do not use such a PPS on input will still have
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// *_weight_l*flag as zero and therefore write equivalently.)
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pps->weighted_pred_flag = 1;
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return 0;
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}
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static int h264_redundant_pps_fixup_slice(H264RedundantPPSContext *ctx,
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H264RawSliceHeader *slice)
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{
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const CodedBitstreamH264Context *const in = ctx->common.input->priv_data;
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const H264RawPPS *const pps = in->pps[slice->pic_parameter_set_id];
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// We modified the PPS's qp value, now offset this by applying
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// the negative offset to the slices.
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slice->slice_qp_delta += pps->pic_init_qp_minus26
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- (NEW_GLOBAL_PIC_INIT_QP - 26);
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return 0;
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}
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static int h264_redundant_pps_update_fragment(AVBSFContext *bsf,
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AVPacket *pkt,
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CodedBitstreamFragment *au)
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{
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H264RedundantPPSContext *ctx = bsf->priv_data;
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int au_has_sps;
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int err, i;
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au_has_sps = 0;
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for (i = 0; i < au->nb_units; i++) {
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CodedBitstreamUnit *nal = &au->units[i];
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if (nal->type == H264_NAL_SPS)
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au_has_sps = 1;
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if (nal->type == H264_NAL_PPS) {
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err = h264_redundant_pps_fixup_pps(ctx, nal);
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if (err < 0)
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return err;
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if (!au_has_sps) {
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av_log(bsf, AV_LOG_VERBOSE, "Deleting redundant PPS "
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"at %"PRId64".\n", pkt->pts);
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ff_cbs_delete_unit(au, i);
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i--;
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continue;
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}
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}
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if (nal->type == H264_NAL_SLICE ||
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nal->type == H264_NAL_IDR_SLICE) {
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H264RawSlice *slice = nal->content;
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h264_redundant_pps_fixup_slice(ctx, &slice->header);
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}
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}
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return 0;
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}
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static const CBSBSFType h264_redundant_pps_type = {
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.codec_id = AV_CODEC_ID_H264,
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.fragment_name = "access unit",
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.unit_name = "NAL unit",
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.update_fragment = &h264_redundant_pps_update_fragment,
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};
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static int h264_redundant_pps_init(AVBSFContext *bsf)
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{
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return ff_cbs_bsf_generic_init(bsf, &h264_redundant_pps_type);
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}
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static const enum AVCodecID h264_redundant_pps_codec_ids[] = {
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AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
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};
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const AVBitStreamFilter ff_h264_redundant_pps_bsf = {
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.name = "h264_redundant_pps",
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.priv_data_size = sizeof(H264RedundantPPSContext),
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.init = &h264_redundant_pps_init,
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.close = &ff_cbs_bsf_generic_close,
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.filter = &ff_cbs_bsf_generic_filter,
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.codec_ids = h264_redundant_pps_codec_ids,
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};
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