| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * This file is part of FFmpeg. | ||
| 3 | * | ||
| 4 | * FFmpeg is free software; you can redistribute it and/or | ||
| 5 | * modify it under the terms of the GNU Lesser General Public | ||
| 6 | * License as published by the Free Software Foundation; either | ||
| 7 | * version 2.1 of the License, or (at your option) any later version. | ||
| 8 | * | ||
| 9 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 12 | * Lesser General Public License for more details. | ||
| 13 | * | ||
| 14 | * You should have received a copy of the GNU Lesser General Public | ||
| 15 | * License along with FFmpeg; if not, write to the Free Software | ||
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 17 | */ | ||
| 18 | |||
| 19 | #include <inttypes.h> | ||
| 20 | |||
| 21 | #include "libavutil/log.h" | ||
| 22 | |||
| 23 | #include "bsf.h" | ||
| 24 | #include "bsf_internal.h" | ||
| 25 | #include "cbs.h" | ||
| 26 | #include "cbs_bsf.h" | ||
| 27 | #include "cbs_h264.h" | ||
| 28 | #include "codec_id.h" | ||
| 29 | #include "h264.h" | ||
| 30 | #include "packet.h" | ||
| 31 | |||
| 32 | #define NEW_GLOBAL_PIC_INIT_QP 26 | ||
| 33 | |||
| 34 | typedef struct H264RedundantPPSContext { | ||
| 35 | CBSBSFContext common; | ||
| 36 | } H264RedundantPPSContext; | ||
| 37 | |||
| 38 | |||
| 39 | 307 | static int h264_redundant_pps_fixup_pps(H264RedundantPPSContext *ctx, | |
| 40 | CodedBitstreamUnit *unit) | ||
| 41 | { | ||
| 42 | H264RawPPS *pps; | ||
| 43 | int err; | ||
| 44 | |||
| 45 | // The changes we are about to perform affect the parsing process, | ||
| 46 | // so we must make sure that the PPS is writable, otherwise the | ||
| 47 | // parsing of future slices will be incorrect and even raise errors. | ||
| 48 | 307 | err = ff_cbs_make_unit_writable(ctx->common.input, unit); | |
| 49 |
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307 | if (err < 0) |
| 50 | ✗ | return err; | |
| 51 | 307 | pps = unit->content; | |
| 52 | |||
| 53 | // Overwrite pic_init_qp with the global value. | ||
| 54 | 307 | pps->pic_init_qp_minus26 = NEW_GLOBAL_PIC_INIT_QP - 26; | |
| 55 | |||
| 56 | // Some PPSs have this set, so it must be set in all of them. | ||
| 57 | // (Slices which do not use such a PPS on input will still have | ||
| 58 | // *_weight_l*flag as zero and therefore write equivalently.) | ||
| 59 | 307 | pps->weighted_pred_flag = 1; | |
| 60 | |||
| 61 | 307 | return 0; | |
| 62 | } | ||
| 63 | |||
| 64 | 516 | static int h264_redundant_pps_fixup_slice(H264RedundantPPSContext *ctx, | |
| 65 | H264RawSliceHeader *slice) | ||
| 66 | { | ||
| 67 | 516 | const CodedBitstreamH264Context *const in = ctx->common.input->priv_data; | |
| 68 | 516 | const H264RawPPS *const pps = in->pps[slice->pic_parameter_set_id]; | |
| 69 | |||
| 70 | // We modified the PPS's qp value, now offset this by applying | ||
| 71 | // the negative offset to the slices. | ||
| 72 | 516 | slice->slice_qp_delta += pps->pic_init_qp_minus26 | |
| 73 | - (NEW_GLOBAL_PIC_INIT_QP - 26); | ||
| 74 | |||
| 75 | 516 | return 0; | |
| 76 | } | ||
| 77 | |||
| 78 | 431 | static int h264_redundant_pps_update_fragment(AVBSFContext *bsf, | |
| 79 | AVPacket *pkt, | ||
| 80 | CodedBitstreamFragment *au) | ||
| 81 | { | ||
| 82 | 431 | H264RedundantPPSContext *ctx = bsf->priv_data; | |
| 83 | int err, i; | ||
| 84 | |||
| 85 |
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1297 | for (i = 0; i < au->nb_units; i++) { |
| 86 | 866 | CodedBitstreamUnit *nal = &au->units[i]; | |
| 87 | |||
| 88 |
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866 | if (nal->type == H264_NAL_PPS) { |
| 89 | 307 | err = h264_redundant_pps_fixup_pps(ctx, nal); | |
| 90 |
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307 | if (err < 0) |
| 91 | ✗ | return err; | |
| 92 | } | ||
| 93 |
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866 | if (nal->type == H264_NAL_SLICE || |
| 94 |
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371 | nal->type == H264_NAL_IDR_SLICE) { |
| 95 | 516 | H264RawSlice *slice = nal->content; | |
| 96 | 516 | h264_redundant_pps_fixup_slice(ctx, &slice->header); | |
| 97 | } | ||
| 98 | } | ||
| 99 | |||
| 100 | 431 | return 0; | |
| 101 | } | ||
| 102 | |||
| 103 | static const CBSBSFType h264_redundant_pps_type = { | ||
| 104 | .codec_id = AV_CODEC_ID_H264, | ||
| 105 | .fragment_name = "access unit", | ||
| 106 | .unit_name = "NAL unit", | ||
| 107 | .update_fragment = &h264_redundant_pps_update_fragment, | ||
| 108 | }; | ||
| 109 | |||
| 110 | 4 | static int h264_redundant_pps_init(AVBSFContext *bsf) | |
| 111 | { | ||
| 112 | 4 | return ff_cbs_bsf_generic_init(bsf, &h264_redundant_pps_type); | |
| 113 | } | ||
| 114 | |||
| 115 | static const enum AVCodecID h264_redundant_pps_codec_ids[] = { | ||
| 116 | AV_CODEC_ID_H264, AV_CODEC_ID_NONE, | ||
| 117 | }; | ||
| 118 | |||
| 119 | const FFBitStreamFilter ff_h264_redundant_pps_bsf = { | ||
| 120 | .p.name = "h264_redundant_pps", | ||
| 121 | .p.codec_ids = h264_redundant_pps_codec_ids, | ||
| 122 | .priv_data_size = sizeof(H264RedundantPPSContext), | ||
| 123 | .init = &h264_redundant_pps_init, | ||
| 124 | .close = &ff_cbs_bsf_generic_close, | ||
| 125 | .filter = &ff_cbs_bsf_generic_filter, | ||
| 126 | }; | ||
| 127 |