FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/vp9_superframe_split_bsf.c	Lines:	60	74	81.1 %
Date:	2021-04-15 16:04:23	Branches:	27	36	75.0 %


/*
 * 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
 */

/**
 * @file
 * This bitstream filter splits VP9 superframes into packets containing
 * just one frame.
 */

#include <stddef.h>

#include "bsf.h"
#include "bsf_internal.h"
#include "bytestream.h"
#include "get_bits.h"

typedef struct VP9SFSplitContext {
    AVPacket *buffer_pkt;

    int nb_frames;
    int next_frame;
    size_t next_frame_offset;
    int sizes[8];
} VP9SFSplitContext;

static int vp9_superframe_split_filter(AVBSFContext *ctx, AVPacket *out)
{
    VP9SFSplitContext *s = ctx->priv_data;
    AVPacket *in;
    int i, j, ret, marker;
    int is_superframe = !!s->buffer_pkt->data;

    if (!s->buffer_pkt->data) {
        ret = ff_bsf_get_packet_ref(ctx, s->buffer_pkt);
        if (ret < 0)
            return ret;
        in = s->buffer_pkt;

        marker = in->data[in->size - 1];
        if ((marker & 0xe0) == 0xc0) {
            int length_size = 1 + ((marker >> 3) & 0x3);
            int   nb_frames = 1 + (marker & 0x7);
            int    idx_size = 2 + nb_frames * length_size;

            if (in->size >= idx_size && in->data[in->size - idx_size] == marker) {
                GetByteContext bc;
                int64_t total_size = 0;

                bytestream2_init(&bc, in->data + in->size + 1 - idx_size,
                                 nb_frames * length_size);

                for (i = 0; i < nb_frames; i++) {
                    int frame_size = 0;
                    for (j = 0; j < length_size; j++)
                        frame_size |= bytestream2_get_byte(&bc) << (j * 8);

                    total_size += frame_size;
                    if (frame_size < 0 || total_size > in->size - idx_size) {
                        av_log(ctx, AV_LOG_ERROR,
                               "Invalid frame size in a superframe: %d\n", frame_size);
                        ret = AVERROR(EINVAL);
                        goto fail;
                    }
                    s->sizes[i] = frame_size;
                }
                s->nb_frames         = nb_frames;
                s->next_frame        = 0;
                s->next_frame_offset = 0;
                is_superframe        = 1;
            }
        }
    }

    if (is_superframe) {
        GetBitContext gb;
        int profile, invisible = 0;

        ret = av_packet_ref(out, s->buffer_pkt);
        if (ret < 0)
            goto fail;

        out->data += s->next_frame_offset;
        out->size  = s->sizes[s->next_frame];

        s->next_frame_offset += out->size;
        s->next_frame++;

        if (s->next_frame >= s->nb_frames)
            av_packet_unref(s->buffer_pkt);

        ret = init_get_bits8(&gb, out->data, out->size);
        if (ret < 0)
            goto fail;

        get_bits(&gb, 2); // frame_marker
        profile  = get_bits1(&gb);
        profile |= get_bits1(&gb) << 1;
        if (profile == 3)
            get_bits1(&gb);
        if (!get_bits1(&gb)) {
            get_bits1(&gb);
            invisible = !get_bits1(&gb);
        }

        if (invisible)
            out->pts = AV_NOPTS_VALUE;

    } else {
        av_packet_move_ref(out, s->buffer_pkt);
    }

    return 0;
fail:
    if (ret < 0)
        av_packet_unref(out);
    av_packet_unref(s->buffer_pkt);
    return ret;
}

static int vp9_superframe_split_init(AVBSFContext *ctx)
{
    VP9SFSplitContext *s = ctx->priv_data;

    s->buffer_pkt = av_packet_alloc();
    if (!s->buffer_pkt)
        return AVERROR(ENOMEM);

    return 0;
}

static void vp9_superframe_split_flush(AVBSFContext *ctx)
{
    VP9SFSplitContext *s = ctx->priv_data;
    av_packet_unref(s->buffer_pkt);
}

static void vp9_superframe_split_uninit(AVBSFContext *ctx)
{
    VP9SFSplitContext *s = ctx->priv_data;
    av_packet_free(&s->buffer_pkt);
}

const AVBitStreamFilter ff_vp9_superframe_split_bsf = {
    .name = "vp9_superframe_split",
    .priv_data_size = sizeof(VP9SFSplitContext),
    .init           = vp9_superframe_split_init,
    .flush          = vp9_superframe_split_flush,
    .close          = vp9_superframe_split_uninit,
    .filter         = vp9_superframe_split_filter,
    .codec_ids      = (const enum AVCodecID []){ AV_CODEC_ID_VP9, AV_CODEC_ID_NONE },
};


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			/**
20			* @file
21			* This bitstream filter splits VP9 superframes into packets containing
22			* just one frame.
23			*/
24
25			#include <stddef.h>
26
27			#include "bsf.h"
28			#include "bsf_internal.h"
29			#include "bytestream.h"
30			#include "get_bits.h"
31
32			typedef struct VP9SFSplitContext {
33			AVPacket *buffer_pkt;
34
35			int nb_frames;
36			int next_frame;
37			size_t next_frame_offset;
38			int sizes[8];
39			} VP9SFSplitContext;
40
41		4514	static int vp9_superframe_split_filter(AVBSFContext ctx, AVPacket out)
42			{
43		4514	VP9SFSplitContext *s = ctx->priv_data;
44			AVPacket *in;
45			int i, j, ret, marker;
46		4514	int is_superframe = !!s->buffer_pkt->data;
47
48	✓✓	4514	if (!s->buffer_pkt->data) {
49		4451	ret = ff_bsf_get_packet_ref(ctx, s->buffer_pkt);
50	✓✓	4451	if (ret < 0)
51		2218	return ret;
52		2233	in = s->buffer_pkt;
53
54		2233	marker = in->data[in->size - 1];
55	✓✓	2233	if ((marker & 0xe0) == 0xc0) {
56		58	int length_size = 1 + ((marker >> 3) & 0x3);
57		58	int nb_frames = 1 + (marker & 0x7);
58		58	int idx_size = 2 + nb_frames * length_size;
59
60	✓✗✓✗	58	if (in->size >= idx_size && in->data[in->size - idx_size] == marker) {
61			GetByteContext bc;
62		58	int64_t total_size = 0;
63
64		58	bytestream2_init(&bc, in->data + in->size + 1 - idx_size,
65			nb_frames * length_size);
66
67	✓✓	179	for (i = 0; i < nb_frames; i++) {
68		121	int frame_size = 0;
69	✓✓	359	for (j = 0; j < length_size; j++)
70		238	frame_size \|= bytestream2_get_byte(&bc) << (j * 8);
71
72		121	total_size += frame_size;
73	✓✗✗✓	121	if (frame_size < 0 \|\| total_size > in->size - idx_size) {
74			av_log(ctx, AV_LOG_ERROR,
75			"Invalid frame size in a superframe: %d\n", frame_size);
76			ret = AVERROR(EINVAL);
77			goto fail;
78			}
79		121	s->sizes[i] = frame_size;
80			}
81		58	s->nb_frames = nb_frames;
82		58	s->next_frame = 0;
83		58	s->next_frame_offset = 0;
84		58	is_superframe = 1;
85			}
86			}
87			}
88
89	✓✓	2296	if (is_superframe) {
90			GetBitContext gb;
91		121	int profile, invisible = 0;
92
93		121	ret = av_packet_ref(out, s->buffer_pkt);
94	✗✓	121	if (ret < 0)
95			goto fail;
96
97		121	out->data += s->next_frame_offset;
98		121	out->size = s->sizes[s->next_frame];
99
100		121	s->next_frame_offset += out->size;
101		121	s->next_frame++;
102
103	✓✓	121	if (s->next_frame >= s->nb_frames)
104		58	av_packet_unref(s->buffer_pkt);
105
106		121	ret = init_get_bits8(&gb, out->data, out->size);
107	✗✓	121	if (ret < 0)
108			goto fail;
109
110		121	get_bits(&gb, 2); // frame_marker
111		121	profile = get_bits1(&gb);
112		121	profile \|= get_bits1(&gb) << 1;
113	✓✓	121	if (profile == 3)
114		26	get_bits1(&gb);
115	✓✓	121	if (!get_bits1(&gb)) {
116		119	get_bits1(&gb);
117		119	invisible = !get_bits1(&gb);
118			}
119
120	✓✓	121	if (invisible)
121		63	out->pts = AV_NOPTS_VALUE;
122
123			} else {
124		2175	av_packet_move_ref(out, s->buffer_pkt);
125			}
126
127		2296	return 0;
128			fail:
129			if (ret < 0)
130			av_packet_unref(out);
131			av_packet_unref(s->buffer_pkt);
132			return ret;
133			}
134
135		468	static int vp9_superframe_split_init(AVBSFContext *ctx)
136			{
137		468	VP9SFSplitContext *s = ctx->priv_data;
138
139		468	s->buffer_pkt = av_packet_alloc();
140	✗✓	468	if (!s->buffer_pkt)
141			return AVERROR(ENOMEM);
142
143		468	return 0;
144			}
145
146			static void vp9_superframe_split_flush(AVBSFContext *ctx)
147			{
148			VP9SFSplitContext *s = ctx->priv_data;
149			av_packet_unref(s->buffer_pkt);
150			}
151
152		468	static void vp9_superframe_split_uninit(AVBSFContext *ctx)
153			{
154		468	VP9SFSplitContext *s = ctx->priv_data;
155		468	av_packet_free(&s->buffer_pkt);
156		468	}
157
158			const AVBitStreamFilter ff_vp9_superframe_split_bsf = {
159			.name = "vp9_superframe_split",
160			.priv_data_size = sizeof(VP9SFSplitContext),
161			.init = vp9_superframe_split_init,
162			.flush = vp9_superframe_split_flush,
163			.close = vp9_superframe_split_uninit,
164			.filter = vp9_superframe_split_filter,
165			.codec_ids = (const enum AVCodecID []){ AV_CODEC_ID_VP9, AV_CODEC_ID_NONE },
166			};