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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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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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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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static int h264_redundant_pps_filter(AVBSFContext *bsf, AVPacket *pkt) |
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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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err = ff_bsf_get_packet_ref(bsf, pkt); |
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if (err < 0) |
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return err; |
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err = ff_cbs_read_packet(ctx->input, au, pkt); |
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if (err < 0) |
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goto fail; |
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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->content); |
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if (err < 0) |
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goto fail; |
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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(ctx->input, 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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err = ff_cbs_write_packet(ctx->output, pkt, au); |
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if (err < 0) |
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goto fail; |
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err = 0; |
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fail: |
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ff_cbs_fragment_reset(ctx->output, au); |
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if (err < 0) |
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av_packet_unref(pkt); |
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return err; |
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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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goto fail; |
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} |
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for (i = 0; i < au->nb_units; i++) { |
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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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} |
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ctx->extradata_pic_init_qp = ctx->current_pic_init_qp; |
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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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goto fail; |
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} |
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} |
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err = 0; |
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fail: |
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ff_cbs_fragment_reset(ctx->output, au); |
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return err; |
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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 void h264_redundant_pps_close(AVBSFContext *bsf) |
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{ |
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H264RedundantPPSContext *ctx = bsf->priv_data; |
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ff_cbs_fragment_free(ctx->input, &ctx->access_unit); |
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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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.flush = &h264_redundant_pps_flush, |
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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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}; |