2017-05-04 22:10:19 +00:00
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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 "cbs.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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CodedBitstreamContext *input;
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CodedBitstreamContext *output;
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CodedBitstreamFragment access_unit;
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int global_pic_init_qp;
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int current_pic_init_qp;
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2018-07-27 01:32:15 +00:00
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int extradata_pic_init_qp;
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2017-05-04 22:10:19 +00:00
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} H264RedundantPPSContext;
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static int h264_redundant_pps_fixup_pps(H264RedundantPPSContext *ctx,
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H264RawPPS *pps)
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{
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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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2019-06-19 23:45:03 +00:00
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static int h264_redundant_pps_filter(AVBSFContext *bsf, AVPacket *pkt)
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2017-05-04 22:10:19 +00:00
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{
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H264RedundantPPSContext *ctx = bsf->priv_data;
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CodedBitstreamFragment *au = &ctx->access_unit;
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int au_has_sps;
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int err, i;
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2019-06-19 23:45:03 +00:00
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err = ff_bsf_get_packet_ref(bsf, pkt);
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2017-05-04 22:10:19 +00:00
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if (err < 0)
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return err;
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2019-06-19 23:45:03 +00:00
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err = ff_cbs_read_packet(ctx->input, au, pkt);
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2017-05-04 22:10:19 +00:00
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if (err < 0)
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2018-11-09 05:31:36 +00:00
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goto fail;
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2017-05-04 22:10:19 +00:00
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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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2018-11-09 05:31:36 +00:00
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err = h264_redundant_pps_fixup_pps(ctx, nal->content);
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if (err < 0)
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goto fail;
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2017-05-04 22:10:19 +00:00
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if (!au_has_sps) {
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2018-11-09 05:31:38 +00:00
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av_log(bsf, AV_LOG_VERBOSE, "Deleting redundant PPS "
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2019-06-19 23:45:03 +00:00
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"at %"PRId64".\n", pkt->pts);
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2018-11-09 05:31:36 +00:00
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err = ff_cbs_delete_unit(ctx->input, au, i);
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if (err < 0)
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goto fail;
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2019-06-19 23:45:04 +00:00
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i--;
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continue;
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2017-05-04 22:10:19 +00:00
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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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2019-06-19 23:45:03 +00:00
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err = ff_cbs_write_packet(ctx->output, pkt, au);
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2017-05-04 22:10:19 +00:00
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if (err < 0)
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2018-11-09 05:31:36 +00:00
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goto fail;
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2017-05-04 22:10:19 +00:00
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2018-11-09 05:31:36 +00:00
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err = 0;
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fail:
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2019-02-11 22:47:43 +00:00
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ff_cbs_fragment_reset(ctx->output, au);
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2018-11-09 05:31:36 +00:00
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if (err < 0)
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2019-06-19 23:45:03 +00:00
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av_packet_unref(pkt);
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2017-05-04 22:10:19 +00:00
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2018-11-09 05:31:36 +00:00
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return err;
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2017-05-04 22:10:19 +00:00
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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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CodedBitstreamFragment *au = &ctx->access_unit;
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int err, i;
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err = ff_cbs_init(&ctx->input, AV_CODEC_ID_H264, bsf);
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if (err < 0)
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return err;
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err = ff_cbs_init(&ctx->output, AV_CODEC_ID_H264, bsf);
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if (err < 0)
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return err;
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ctx->global_pic_init_qp = 26;
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if (bsf->par_in->extradata) {
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err = ff_cbs_read_extradata(ctx->input, au, bsf->par_in);
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if (err < 0) {
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av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
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2018-11-09 05:31:36 +00:00
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goto fail;
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2017-05-04 22:10:19 +00:00
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}
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for (i = 0; i < au->nb_units; i++) {
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2018-11-09 05:31:36 +00:00
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if (au->units[i].type == H264_NAL_PPS) {
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err = h264_redundant_pps_fixup_pps(ctx, au->units[i].content);
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if (err < 0)
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goto fail;
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}
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2017-05-04 22:10:19 +00:00
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}
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2018-07-27 01:32:15 +00:00
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ctx->extradata_pic_init_qp = ctx->current_pic_init_qp;
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2017-05-04 22:10:19 +00:00
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err = ff_cbs_write_extradata(ctx->output, bsf->par_out, au);
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if (err < 0) {
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av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
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2018-11-09 05:31:36 +00:00
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goto fail;
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2017-05-04 22:10:19 +00:00
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}
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}
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2018-11-09 05:31:36 +00:00
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err = 0;
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fail:
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2019-02-11 22:47:43 +00:00
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ff_cbs_fragment_reset(ctx->output, au);
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2018-11-09 05:31:36 +00:00
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return err;
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2017-05-04 22:10:19 +00:00
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}
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2018-07-27 01:32:15 +00:00
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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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2017-05-04 22:10:19 +00:00
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static void h264_redundant_pps_close(AVBSFContext *bsf)
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{
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H264RedundantPPSContext *ctx = bsf->priv_data;
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2019-02-11 22:47:43 +00:00
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ff_cbs_fragment_free(ctx->input, &ctx->access_unit);
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2017-05-04 22:10:19 +00:00
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ff_cbs_close(&ctx->input);
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ff_cbs_close(&ctx->output);
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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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2018-07-27 01:32:15 +00:00
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.flush = &h264_redundant_pps_flush,
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2017-05-04 22:10:19 +00:00
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.close = &h264_redundant_pps_close,
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.filter = &h264_redundant_pps_filter,
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.codec_ids = h264_redundant_pps_codec_ids,
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};
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