Head

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/h264_redundant_pps_bsf.c	Lines:	0	82	0.0 %
Date:	2020-01-29 01:05:39	Branches:	0	38	0.0 %


/*
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <string.h>

#include "libavutil/common.h"
#include "libavutil/mem.h"

#include "bsf.h"
#include "cbs.h"
#include "cbs_h264.h"
#include "h264.h"


typedef struct H264RedundantPPSContext {
    CodedBitstreamContext *input;
    CodedBitstreamContext *output;

    CodedBitstreamFragment access_unit;

    int global_pic_init_qp;
    int current_pic_init_qp;
    int extradata_pic_init_qp;
} H264RedundantPPSContext;


static int h264_redundant_pps_fixup_pps(H264RedundantPPSContext *ctx,
                                        H264RawPPS *pps)
{
    // Record the current value of pic_init_qp in order to fix up
    // following slices, then overwrite with the global value.
    ctx->current_pic_init_qp = pps->pic_init_qp_minus26 + 26;
    pps->pic_init_qp_minus26 = ctx->global_pic_init_qp - 26;

    // Some PPSs have this set, so it must be set in all of them.
    // (Slices which do not use such a PPS on input will still have
    // *_weight_l*flag as zero and therefore write equivalently.)
    pps->weighted_pred_flag = 1;

    return 0;
}

static int h264_redundant_pps_fixup_slice(H264RedundantPPSContext *ctx,
                                          H264RawSliceHeader *slice)
{
    int qp;

    qp = ctx->current_pic_init_qp + slice->slice_qp_delta;
    slice->slice_qp_delta = qp - ctx->global_pic_init_qp;

    return 0;
}

static int h264_redundant_pps_filter(AVBSFContext *bsf, AVPacket *pkt)
{
    H264RedundantPPSContext *ctx = bsf->priv_data;
    CodedBitstreamFragment *au = &ctx->access_unit;
    int au_has_sps;
    int err, i;

    err = ff_bsf_get_packet_ref(bsf, pkt);
    if (err < 0)
        return err;

    err = ff_cbs_read_packet(ctx->input, au, pkt);
    if (err < 0)
        goto fail;

    au_has_sps = 0;
    for (i = 0; i < au->nb_units; i++) {
        CodedBitstreamUnit *nal = &au->units[i];

        if (nal->type == H264_NAL_SPS)
            au_has_sps = 1;
        if (nal->type == H264_NAL_PPS) {
            err = h264_redundant_pps_fixup_pps(ctx, nal->content);
            if (err < 0)
                goto fail;
            if (!au_has_sps) {
                av_log(bsf, AV_LOG_VERBOSE, "Deleting redundant PPS "
                       "at %"PRId64".\n", pkt->pts);
                ff_cbs_delete_unit(ctx->input, au, i);
                i--;
                continue;
            }
        }
        if (nal->type == H264_NAL_SLICE ||
            nal->type == H264_NAL_IDR_SLICE) {
            H264RawSlice *slice = nal->content;
            h264_redundant_pps_fixup_slice(ctx, &slice->header);
        }
    }

    err = ff_cbs_write_packet(ctx->output, pkt, au);
    if (err < 0)
        goto fail;

    err = 0;
fail:
    ff_cbs_fragment_reset(ctx->output, au);
    if (err < 0)
        av_packet_unref(pkt);

    return err;
}

static int h264_redundant_pps_init(AVBSFContext *bsf)
{
    H264RedundantPPSContext *ctx = bsf->priv_data;
    CodedBitstreamFragment *au = &ctx->access_unit;
    int err, i;

    err = ff_cbs_init(&ctx->input, AV_CODEC_ID_H264, bsf);
    if (err < 0)
        return err;

    err = ff_cbs_init(&ctx->output, AV_CODEC_ID_H264, bsf);
    if (err < 0)
        return err;

    ctx->global_pic_init_qp = 26;

    if (bsf->par_in->extradata) {
        err = ff_cbs_read_extradata(ctx->input, au, bsf->par_in);
        if (err < 0) {
            av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
            goto fail;
        }

        for (i = 0; i < au->nb_units; i++) {
            if (au->units[i].type == H264_NAL_PPS) {
                err = h264_redundant_pps_fixup_pps(ctx, au->units[i].content);
                if (err < 0)
                    goto fail;
            }
        }

        ctx->extradata_pic_init_qp = ctx->current_pic_init_qp;
        err = ff_cbs_write_extradata(ctx->output, bsf->par_out, au);
        if (err < 0) {
            av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
            goto fail;
        }
    }

    err = 0;
fail:
    ff_cbs_fragment_reset(ctx->output, au);
    return err;
}

static void h264_redundant_pps_flush(AVBSFContext *bsf)
{
    H264RedundantPPSContext *ctx = bsf->priv_data;
    ctx->current_pic_init_qp = ctx->extradata_pic_init_qp;
}

static void h264_redundant_pps_close(AVBSFContext *bsf)
{
    H264RedundantPPSContext *ctx = bsf->priv_data;

    ff_cbs_fragment_free(ctx->input, &ctx->access_unit);
    ff_cbs_close(&ctx->input);
    ff_cbs_close(&ctx->output);
}

static const enum AVCodecID h264_redundant_pps_codec_ids[] = {
    AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
};

const AVBitStreamFilter ff_h264_redundant_pps_bsf = {
    .name           = "h264_redundant_pps",
    .priv_data_size = sizeof(H264RedundantPPSContext),
    .init           = &h264_redundant_pps_init,
    .flush          = &h264_redundant_pps_flush,
    .close          = &h264_redundant_pps_close,
    .filter         = &h264_redundant_pps_filter,
    .codec_ids      = h264_redundant_pps_codec_ids,
};


Generated by: GCOVR (Version 4.1)

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 <string.h>
20
21			#include "libavutil/common.h"
22			#include "libavutil/mem.h"
23
24			#include "bsf.h"
25			#include "cbs.h"
26			#include "cbs_h264.h"
27			#include "h264.h"
28
29
30			typedef struct H264RedundantPPSContext {
31			CodedBitstreamContext *input;
32			CodedBitstreamContext *output;
33
34			CodedBitstreamFragment access_unit;
35
36			int global_pic_init_qp;
37			int current_pic_init_qp;
38			int extradata_pic_init_qp;
39			} H264RedundantPPSContext;
40
41
42			static int h264_redundant_pps_fixup_pps(H264RedundantPPSContext *ctx,
43			H264RawPPS *pps)
44			{
45			// Record the current value of pic_init_qp in order to fix up
46			// following slices, then overwrite with the global value.
47			ctx->current_pic_init_qp = pps->pic_init_qp_minus26 + 26;
48			pps->pic_init_qp_minus26 = ctx->global_pic_init_qp - 26;
49
50			// Some PPSs have this set, so it must be set in all of them.
51			// (Slices which do not use such a PPS on input will still have
52			// _weight_lflag as zero and therefore write equivalently.)
53			pps->weighted_pred_flag = 1;
54
55			return 0;
56			}
57
58			static int h264_redundant_pps_fixup_slice(H264RedundantPPSContext *ctx,
59			H264RawSliceHeader *slice)
60			{
61			int qp;
62
63			qp = ctx->current_pic_init_qp + slice->slice_qp_delta;
64			slice->slice_qp_delta = qp - ctx->global_pic_init_qp;
65
66			return 0;
67			}
68
69			static int h264_redundant_pps_filter(AVBSFContext bsf, AVPacket pkt)
70			{
71			H264RedundantPPSContext *ctx = bsf->priv_data;
72			CodedBitstreamFragment *au = &ctx->access_unit;
73			int au_has_sps;
74			int err, i;
75
76			err = ff_bsf_get_packet_ref(bsf, pkt);
77			if (err < 0)
78			return err;
79
80			err = ff_cbs_read_packet(ctx->input, au, pkt);
81			if (err < 0)
82			goto fail;
83
84			au_has_sps = 0;
85			for (i = 0; i < au->nb_units; i++) {
86			CodedBitstreamUnit *nal = &au->units[i];
87
88			if (nal->type == H264_NAL_SPS)
89			au_has_sps = 1;
90			if (nal->type == H264_NAL_PPS) {
91			err = h264_redundant_pps_fixup_pps(ctx, nal->content);
92			if (err < 0)
93			goto fail;
94			if (!au_has_sps) {
95			av_log(bsf, AV_LOG_VERBOSE, "Deleting redundant PPS "
96			"at %"PRId64".\n", pkt->pts);
97			ff_cbs_delete_unit(ctx->input, au, i);
98			i--;
99			continue;
100			}
101			}
102			if (nal->type == H264_NAL_SLICE \|\|
103			nal->type == H264_NAL_IDR_SLICE) {
104			H264RawSlice *slice = nal->content;
105			h264_redundant_pps_fixup_slice(ctx, &slice->header);
106			}
107			}
108
109			err = ff_cbs_write_packet(ctx->output, pkt, au);
110			if (err < 0)
111			goto fail;
112
113			err = 0;
114			fail:
115			ff_cbs_fragment_reset(ctx->output, au);
116			if (err < 0)
117			av_packet_unref(pkt);
118
119			return err;
120			}
121
122			static int h264_redundant_pps_init(AVBSFContext *bsf)
123			{
124			H264RedundantPPSContext *ctx = bsf->priv_data;
125			CodedBitstreamFragment *au = &ctx->access_unit;
126			int err, i;
127
128			err = ff_cbs_init(&ctx->input, AV_CODEC_ID_H264, bsf);
129			if (err < 0)
130			return err;
131
132			err = ff_cbs_init(&ctx->output, AV_CODEC_ID_H264, bsf);
133			if (err < 0)
134			return err;
135
136			ctx->global_pic_init_qp = 26;
137
138			if (bsf->par_in->extradata) {
139			err = ff_cbs_read_extradata(ctx->input, au, bsf->par_in);
140			if (err < 0) {
141			av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
142			goto fail;
143			}
144
145			for (i = 0; i < au->nb_units; i++) {
146			if (au->units[i].type == H264_NAL_PPS) {
147			err = h264_redundant_pps_fixup_pps(ctx, au->units[i].content);
148			if (err < 0)
149			goto fail;
150			}
151			}
152
153			ctx->extradata_pic_init_qp = ctx->current_pic_init_qp;
154			err = ff_cbs_write_extradata(ctx->output, bsf->par_out, au);
155			if (err < 0) {
156			av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
157			goto fail;
158			}
159			}
160
161			err = 0;
162			fail:
163			ff_cbs_fragment_reset(ctx->output, au);
164			return err;
165			}
166
167			static void h264_redundant_pps_flush(AVBSFContext *bsf)
168			{
169			H264RedundantPPSContext *ctx = bsf->priv_data;
170			ctx->current_pic_init_qp = ctx->extradata_pic_init_qp;
171			}
172
173			static void h264_redundant_pps_close(AVBSFContext *bsf)
174			{
175			H264RedundantPPSContext *ctx = bsf->priv_data;
176
177			ff_cbs_fragment_free(ctx->input, &ctx->access_unit);
178			ff_cbs_close(&ctx->input);
179			ff_cbs_close(&ctx->output);
180			}
181
182			static const enum AVCodecID h264_redundant_pps_codec_ids[] = {
183			AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
184			};
185
186			const AVBitStreamFilter ff_h264_redundant_pps_bsf = {
187			.name = "h264_redundant_pps",
188			.priv_data_size = sizeof(H264RedundantPPSContext),
189			.init = &h264_redundant_pps_init,
190			.flush = &h264_redundant_pps_flush,
191			.close = &h264_redundant_pps_close,
192			.filter = &h264_redundant_pps_filter,
193			.codec_ids = h264_redundant_pps_codec_ids,
194			};