FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/h264_redundant_pps_bsf.c	Lines:	0	86	0.0 %
Date:	2021-01-21 13:05:02	Branches:	0	40	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 "bsf_internal.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,
                                        CodedBitstreamUnit *unit)
{
    H264RawPPS *pps;
    int err;

    // The changes we are about to perform affect the parsing process,
    // so we must make sure that the PPS is writable, otherwise the
    // parsing of future slices will be incorrect and even raise errors.
    err = ff_cbs_make_unit_writable(ctx->input, unit);
    if (err < 0)
        return err;
    pps = unit->content;

    // 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);
            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(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(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]);
                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(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->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 4.2)

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 "bsf_internal.h"
26			#include "cbs.h"
27			#include "cbs_h264.h"
28			#include "h264.h"
29
30
31			typedef struct H264RedundantPPSContext {
32			CodedBitstreamContext *input;
33			CodedBitstreamContext *output;
34
35			CodedBitstreamFragment access_unit;
36
37			int global_pic_init_qp;
38			int current_pic_init_qp;
39			int extradata_pic_init_qp;
40			} H264RedundantPPSContext;
41
42
43			static int h264_redundant_pps_fixup_pps(H264RedundantPPSContext *ctx,
44			CodedBitstreamUnit *unit)
45			{
46			H264RawPPS *pps;
47			int err;
48
49			// The changes we are about to perform affect the parsing process,
50			// so we must make sure that the PPS is writable, otherwise the
51			// parsing of future slices will be incorrect and even raise errors.
52			err = ff_cbs_make_unit_writable(ctx->input, unit);
53			if (err < 0)
54			return err;
55			pps = unit->content;
56
57			// Record the current value of pic_init_qp in order to fix up
58			// following slices, then overwrite with the global value.
59			ctx->current_pic_init_qp = pps->pic_init_qp_minus26 + 26;
60			pps->pic_init_qp_minus26 = ctx->global_pic_init_qp - 26;
61
62			// Some PPSs have this set, so it must be set in all of them.
63			// (Slices which do not use such a PPS on input will still have
64			// _weight_lflag as zero and therefore write equivalently.)
65			pps->weighted_pred_flag = 1;
66
67			return 0;
68			}
69
70			static int h264_redundant_pps_fixup_slice(H264RedundantPPSContext *ctx,
71			H264RawSliceHeader *slice)
72			{
73			int qp;
74
75			qp = ctx->current_pic_init_qp + slice->slice_qp_delta;
76			slice->slice_qp_delta = qp - ctx->global_pic_init_qp;
77
78			return 0;
79			}
80
81			static int h264_redundant_pps_filter(AVBSFContext bsf, AVPacket pkt)
82			{
83			H264RedundantPPSContext *ctx = bsf->priv_data;
84			CodedBitstreamFragment *au = &ctx->access_unit;
85			int au_has_sps;
86			int err, i;
87
88			err = ff_bsf_get_packet_ref(bsf, pkt);
89			if (err < 0)
90			return err;
91
92			err = ff_cbs_read_packet(ctx->input, au, pkt);
93			if (err < 0)
94			goto fail;
95
96			au_has_sps = 0;
97			for (i = 0; i < au->nb_units; i++) {
98			CodedBitstreamUnit *nal = &au->units[i];
99
100			if (nal->type == H264_NAL_SPS)
101			au_has_sps = 1;
102			if (nal->type == H264_NAL_PPS) {
103			err = h264_redundant_pps_fixup_pps(ctx, nal);
104			if (err < 0)
105			goto fail;
106			if (!au_has_sps) {
107			av_log(bsf, AV_LOG_VERBOSE, "Deleting redundant PPS "
108			"at %"PRId64".\n", pkt->pts);
109			ff_cbs_delete_unit(au, i);
110			i--;
111			continue;
112			}
113			}
114			if (nal->type == H264_NAL_SLICE \|\|
115			nal->type == H264_NAL_IDR_SLICE) {
116			H264RawSlice *slice = nal->content;
117			h264_redundant_pps_fixup_slice(ctx, &slice->header);
118			}
119			}
120
121			err = ff_cbs_write_packet(ctx->output, pkt, au);
122			if (err < 0)
123			goto fail;
124
125			err = 0;
126			fail:
127			ff_cbs_fragment_reset(au);
128			if (err < 0)
129			av_packet_unref(pkt);
130
131			return err;
132			}
133
134			static int h264_redundant_pps_init(AVBSFContext *bsf)
135			{
136			H264RedundantPPSContext *ctx = bsf->priv_data;
137			CodedBitstreamFragment *au = &ctx->access_unit;
138			int err, i;
139
140			err = ff_cbs_init(&ctx->input, AV_CODEC_ID_H264, bsf);
141			if (err < 0)
142			return err;
143
144			err = ff_cbs_init(&ctx->output, AV_CODEC_ID_H264, bsf);
145			if (err < 0)
146			return err;
147
148			ctx->global_pic_init_qp = 26;
149
150			if (bsf->par_in->extradata) {
151			err = ff_cbs_read_extradata(ctx->input, au, bsf->par_in);
152			if (err < 0) {
153			av_log(bsf, AV_LOG_ERROR, "Failed to read extradata.\n");
154			goto fail;
155			}
156
157			for (i = 0; i < au->nb_units; i++) {
158			if (au->units[i].type == H264_NAL_PPS) {
159			err = h264_redundant_pps_fixup_pps(ctx, &au->units[i]);
160			if (err < 0)
161			goto fail;
162			}
163			}
164
165			ctx->extradata_pic_init_qp = ctx->current_pic_init_qp;
166			err = ff_cbs_write_extradata(ctx->output, bsf->par_out, au);
167			if (err < 0) {
168			av_log(bsf, AV_LOG_ERROR, "Failed to write extradata.\n");
169			goto fail;
170			}
171			}
172
173			err = 0;
174			fail:
175			ff_cbs_fragment_reset(au);
176			return err;
177			}
178
179			static void h264_redundant_pps_flush(AVBSFContext *bsf)
180			{
181			H264RedundantPPSContext *ctx = bsf->priv_data;
182			ctx->current_pic_init_qp = ctx->extradata_pic_init_qp;
183			}
184
185			static void h264_redundant_pps_close(AVBSFContext *bsf)
186			{
187			H264RedundantPPSContext *ctx = bsf->priv_data;
188
189			ff_cbs_fragment_free(&ctx->access_unit);
190			ff_cbs_close(&ctx->input);
191			ff_cbs_close(&ctx->output);
192			}
193
194			static const enum AVCodecID h264_redundant_pps_codec_ids[] = {
195			AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
196			};
197
198			const AVBitStreamFilter ff_h264_redundant_pps_bsf = {
199			.name = "h264_redundant_pps",
200			.priv_data_size = sizeof(H264RedundantPPSContext),
201			.init = &h264_redundant_pps_init,
202			.flush = &h264_redundant_pps_flush,
203			.close = &h264_redundant_pps_close,
204			.filter = &h264_redundant_pps_filter,
205			.codec_ids = h264_redundant_pps_codec_ids,
206			};