FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/vp9_superframe_split_bsf.c
Date: 2021-09-22 05:58:22
Exec Total Coverage
Lines: 60 74 81.1%
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 4536 static int vp9_superframe_split_filter(AVBSFContext *ctx, AVPacket *out)
42 {
43 4536 VP9SFSplitContext *s = ctx->priv_data;
44 AVPacket *in;
45 int i, j, ret, marker;
46 4536 int is_superframe = !!s->buffer_pkt->data;
47
48
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4536 if (!s->buffer_pkt->data) {
49 4472 ret = ff_bsf_get_packet_ref(ctx, s->buffer_pkt);
50
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4472 if (ret < 0)
51 2229 return ret;
52 2243 in = s->buffer_pkt;
53
54 2243 marker = in->data[in->size - 1];
55
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2243 if ((marker & 0xe0) == 0xc0) {
56 59 int length_size = 1 + ((marker >> 3) & 0x3);
57 59 int nb_frames = 1 + (marker & 0x7);
58 59 int idx_size = 2 + nb_frames * length_size;
59
60
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59 if (in->size >= idx_size && in->data[in->size - idx_size] == marker) {
61 GetByteContext bc;
62 59 int64_t total_size = 0;
63
64 59 bytestream2_init(&bc, in->data + in->size + 1 - idx_size,
65 nb_frames * length_size);
66
67
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182 for (i = 0; i < nb_frames; i++) {
68 123 int frame_size = 0;
69
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365 for (j = 0; j < length_size; j++)
70 242 frame_size |= bytestream2_get_byte(&bc) << (j * 8);
71
72 123 total_size += frame_size;
73
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123 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 }
79 123 s->sizes[i] = frame_size;
80 }
81 59 s->nb_frames = nb_frames;
82 59 s->next_frame = 0;
83 59 s->next_frame_offset = 0;
84 59 is_superframe = 1;
85 }
86 }
87 }
88
89
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2307 if (is_superframe) {
90 GetBitContext gb;
91 123 int profile, invisible = 0;
92
93 123 ret = av_packet_ref(out, s->buffer_pkt);
94
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123 if (ret < 0)
95 goto fail;
96
97 123 out->data += s->next_frame_offset;
98 123 out->size = s->sizes[s->next_frame];
99
100 123 s->next_frame_offset += out->size;
101 123 s->next_frame++;
102
103
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123 if (s->next_frame >= s->nb_frames)
104 59 av_packet_unref(s->buffer_pkt);
105
106 123 ret = init_get_bits8(&gb, out->data, out->size);
107
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123 if (ret < 0)
108 goto fail;
109
110 123 get_bits(&gb, 2); // frame_marker
111 123 profile = get_bits1(&gb);
112 123 profile |= get_bits1(&gb) << 1;
113
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123 if (profile == 3)
114 28 get_bits1(&gb);
115
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123 if (!get_bits1(&gb)) {
116 121 get_bits1(&gb);
117 121 invisible = !get_bits1(&gb);
118 }
119
120
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123 if (invisible)
121 64 out->pts = AV_NOPTS_VALUE;
122
123 } else {
124 2184 av_packet_move_ref(out, s->buffer_pkt);
125 }
126
127 2307 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
135 469 static int vp9_superframe_split_init(AVBSFContext *ctx)
136 {
137 469 VP9SFSplitContext *s = ctx->priv_data;
138
139 469 s->buffer_pkt = av_packet_alloc();
140
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469 if (!s->buffer_pkt)
141 return AVERROR(ENOMEM);
142
143 469 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
152 469 static void vp9_superframe_split_uninit(AVBSFContext *ctx)
153 {
154 469 VP9SFSplitContext *s = ctx->priv_data;
155 469 av_packet_free(&s->buffer_pkt);
156 469 }
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 };
167