FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/avs2_parser.c
Date: 2022-07-05 19:52:29
Exec Total Coverage
Lines: 0 91 0.0%
Branches: 0 50 0.0%

Line Branch Exec Source
1 /*
2 * AVS2-P2/IEEE1857.4 video parser.
3 * Copyright (c) 2018 Huiwen Ren <hwrenx@gmail.com>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/avutil.h"
23 #include "avs2.h"
24 #include "get_bits.h"
25 #include "parser.h"
26
27 static int avs2_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
28 {
29 int pic_found = pc->frame_start_found;
30 uint32_t state = pc->state;
31 int cur = 0;
32
33 if (!pic_found) {
34 for (; cur < buf_size; ++cur) {
35 state = (state << 8) | buf[cur];
36 if ((state & 0xFFFFFF00) == 0x100 && AVS2_ISPIC(buf[cur])) {
37 cur++;
38 pic_found = 1;
39 break;
40 }
41 }
42 }
43
44 if (pic_found) {
45 if (!buf_size)
46 return END_NOT_FOUND;
47 for (; cur < buf_size; cur++) {
48 state = (state << 8) | buf[cur];
49 if ((state & 0xFFFFFF00) == 0x100 && AVS2_ISUNIT(buf[cur])) {
50 pc->frame_start_found = 0;
51 pc->state = -1;
52 return cur - 3;
53 }
54 }
55 }
56
57 pc->frame_start_found = pic_found;
58 pc->state = state;
59
60 return END_NOT_FOUND;
61 }
62
63 static void parse_avs2_seq_header(AVCodecParserContext *s, const uint8_t *buf,
64 int buf_size, AVCodecContext *avctx)
65 {
66 GetBitContext gb;
67 int profile, level;
68 int width, height;
69 int chroma, sample_precision, encoding_precision = 1;
70 // sample_precision and encoding_precision is 3 bits
71 static const uint8_t precision[8] = { 0, 8, 10 };
72 unsigned aspect_ratio;
73 unsigned frame_rate_code;
74 int low_delay;
75 // update buf_size_min if parse more deeper
76 const int buf_size_min = 15;
77
78 if (buf_size < buf_size_min)
79 return;
80
81 init_get_bits8(&gb, buf, buf_size_min);
82
83 s->key_frame = 1;
84 s->pict_type = AV_PICTURE_TYPE_I;
85
86 profile = get_bits(&gb, 8);
87 level = get_bits(&gb, 8);
88
89 // progressive_sequence u(1)
90 // field_coded_sequence u(1)
91 skip_bits(&gb, 2);
92
93 width = get_bits(&gb, 14);
94 height = get_bits(&gb, 14);
95
96 chroma = get_bits(&gb, 2);
97 sample_precision = get_bits(&gb, 3);
98 if (profile == AVS2_PROFILE_MAIN10)
99 encoding_precision = get_bits(&gb, 3);
100
101 aspect_ratio = get_bits(&gb, 4);
102 frame_rate_code = get_bits(&gb, 4);
103
104 // bit_rate_lower u(18)
105 // marker_bit f(1)
106 // bit_rate_upper u(12)
107 skip_bits(&gb, 31);
108
109 low_delay = get_bits(&gb, 1);
110
111 s->width = width;
112 s->height = height;
113 s->coded_width = FFALIGN(width, 8);
114 s->coded_height = FFALIGN(height, 8);
115 avctx->framerate.num = avctx->time_base.den =
116 ff_avs2_frame_rate_tab[frame_rate_code].num;
117 avctx->framerate.den = avctx->time_base.num =
118 ff_avs2_frame_rate_tab[frame_rate_code].den;
119 avctx->has_b_frames = FFMAX(avctx->has_b_frames, !low_delay);
120
121 av_log(avctx, AV_LOG_DEBUG,
122 "AVS2 parse seq HDR: profile %x, level %x, "
123 "width %d, height %d, "
124 "chroma %d, sample_precision %d bits, encoding_precision %d bits, "
125 "aspect_ratio 0x%x, framerate %d/%d, low_delay %d\n",
126 profile, level,
127 width, height,
128 chroma, precision[sample_precision], precision[encoding_precision],
129 aspect_ratio, avctx->framerate.num, avctx->framerate.den, low_delay);
130 }
131
132 static void parse_avs2_units(AVCodecParserContext *s, const uint8_t *buf,
133 int buf_size, AVCodecContext *avctx)
134 {
135 if (buf_size < 5)
136 return;
137
138 if (!(buf[0] == 0x0 && buf[1] == 0x0 && buf[2] == 0x1))
139 return;
140
141 switch (buf[3]) {
142 case AVS2_SEQ_START_CODE:
143 parse_avs2_seq_header(s, buf + 4, buf_size - 4, avctx);
144 return;
145 case AVS2_INTRA_PIC_START_CODE:
146 s->key_frame = 1;
147 s->pict_type = AV_PICTURE_TYPE_I;
148 return;
149 case AVS2_INTER_PIC_START_CODE:
150 s->key_frame = 0;
151 if (buf_size > 9) {
152 int pic_code_type = buf[8] & 0x3;
153 if (pic_code_type == 1)
154 s->pict_type = AV_PICTURE_TYPE_P;
155 else if (pic_code_type == 3)
156 s->pict_type = AV_PICTURE_TYPE_S;
157 else
158 s->pict_type = AV_PICTURE_TYPE_B;
159 }
160 return;
161 }
162 }
163
164 static int avs2_parse(AVCodecParserContext *s, AVCodecContext *avctx,
165 const uint8_t **poutbuf, int *poutbuf_size,
166 const uint8_t *buf, int buf_size)
167 {
168 ParseContext *pc = s->priv_data;
169 int next;
170
171 if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
172 next = buf_size;
173 } else {
174 next = avs2_find_frame_end(pc, buf, buf_size);
175 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
176 *poutbuf = NULL;
177 *poutbuf_size = 0;
178 return buf_size;
179 }
180 }
181
182 parse_avs2_units(s, buf, buf_size, avctx);
183
184 *poutbuf = buf;
185 *poutbuf_size = buf_size;
186
187 return next;
188 }
189
190 const AVCodecParser ff_avs2_parser = {
191 .codec_ids = { AV_CODEC_ID_AVS2 },
192 .priv_data_size = sizeof(ParseContext),
193 .parser_parse = avs2_parse,
194 .parser_close = ff_parse_close,
195 };
196