GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/vp9_superframe_split_bsf.c Lines: 60 74 81.1 %
Date: 2020-10-23 17:01:47 Branches: 27 36 75.0 %

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
};