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/* |
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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 "libavutil/mem.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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typedef struct H264RedundantPPSContext { |
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CBSBSFContext common; |
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int global_pic_init_qp; |
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int current_pic_init_qp; |
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int extradata_pic_init_qp; |
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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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// Record the current value of pic_init_qp in order to fix up |
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// following slices, then overwrite with the global value. |
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ctx->current_pic_init_qp = pps->pic_init_qp_minus26 + 26; |
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pps->pic_init_qp_minus26 = ctx->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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int qp; |
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qp = ctx->current_pic_init_qp + slice->slice_qp_delta; |
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slice->slice_qp_delta = qp - ctx->global_pic_init_qp; |
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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 void h264_redundant_pps_flush(AVBSFContext *bsf) |
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{ |
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H264RedundantPPSContext *ctx = bsf->priv_data; |
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ctx->current_pic_init_qp = ctx->extradata_pic_init_qp; |
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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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H264RedundantPPSContext *ctx = bsf->priv_data; |
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ctx->global_pic_init_qp = 26; |
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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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.flush = &h264_redundant_pps_flush, |
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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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}; |