FFmpeg coverage

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			#include "parser_internal.h"
27
28		✗	static int avs2_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size)
29			{
30		✗	int pic_found = pc->frame_start_found;
31		✗	uint32_t state = pc->state;
32		✗	int cur = 0;
33
34		✗	if (!pic_found) {
35		✗	for (; cur < buf_size; ++cur) {
36		✗	state = (state << 8) | buf[cur];
37		✗	if ((state & 0xFFFFFF00) == 0x100 && AVS2_ISPIC(buf[cur])) {
38		✗	cur++;
39		✗	pic_found = 1;
40		✗	break;
41			}
42			}
43			}
44
45		✗	if (pic_found) {
46		✗	if (!buf_size)
47		✗	return END_NOT_FOUND;
48		✗	for (; cur < buf_size; cur++) {
49		✗	state = (state << 8) | buf[cur];
50		✗	if ((state & 0xFFFFFF00) == 0x100 && AVS2_ISUNIT(buf[cur])) {
51		✗	pc->frame_start_found = 0;
52		✗	pc->state = -1;
53		✗	return cur - 3;
54			}
55			}
56			}
57
58		✗	pc->frame_start_found = pic_found;
59		✗	pc->state = state;
60
61		✗	return END_NOT_FOUND;
62			}
63
64		✗	static void parse_avs2_seq_header(AVCodecParserContext *s, const uint8_t *buf,
65			int buf_size, AVCodecContext *avctx)
66			{
67			GetBitContext gb;
68			int profile, level;
69			int width, height;
70		✗	int chroma, sample_precision, encoding_precision = 1;
71			// sample_precision and encoding_precision is 3 bits
72			static const uint8_t precision[8] = { 0, 8, 10 };
73			unsigned aspect_ratio;
74			unsigned frame_rate_code;
75			int low_delay;
76			av_unused int ret;
77			// update buf_size_min if parse more deeper
78		✗	const int buf_size_min = 15;
79
80		✗	if (buf_size < buf_size_min)
81		✗	return;
82
83		✗	ret = init_get_bits8(&gb, buf, buf_size_min);
84			av_assert1(ret >= 0);
85
86		✗	s->key_frame = 1;
87		✗	s->pict_type = AV_PICTURE_TYPE_I;
88
89		✗	profile = get_bits(&gb, 8);
90		✗	level = get_bits(&gb, 8);
91
92			// progressive_sequence u(1)
93			// field_coded_sequence u(1)
94		✗	skip_bits(&gb, 2);
95
96		✗	width = get_bits(&gb, 14);
97		✗	height = get_bits(&gb, 14);
98
99		✗	chroma = get_bits(&gb, 2);
100		✗	sample_precision = get_bits(&gb, 3);
101		✗	if (profile == AVS2_PROFILE_MAIN10)
102		✗	encoding_precision = get_bits(&gb, 3);
103
104		✗	aspect_ratio = get_bits(&gb, 4);
105		✗	frame_rate_code = get_bits(&gb, 4);
106
107			// bit_rate_lower u(18)
108			// marker_bit f(1)
109			// bit_rate_upper u(12)
110		✗	skip_bits(&gb, 31);
111
112		✗	low_delay = get_bits(&gb, 1);
113
114		✗	s->width = width;
115		✗	s->height = height;
116		✗	s->coded_width = FFALIGN(width, 8);
117		✗	s->coded_height = FFALIGN(height, 8);
118		✗	avctx->framerate.num =
119		✗	ff_avs2_frame_rate_tab[frame_rate_code].num;
120		✗	avctx->framerate.den =
121		✗	ff_avs2_frame_rate_tab[frame_rate_code].den;
122		✗	avctx->has_b_frames = FFMAX(avctx->has_b_frames, !low_delay);
123
124		✗	av_log(avctx, AV_LOG_DEBUG,
125			"AVS2 parse seq HDR: profile %x, level %x, "
126			"width %d, height %d, "
127			"chroma %d, sample_precision %d bits, encoding_precision %d bits, "
128			"aspect_ratio 0x%x, framerate %d/%d, low_delay %d\n",
129			profile, level,
130			width, height,
131		✗	chroma, precision[sample_precision], precision[encoding_precision],
132			aspect_ratio, avctx->framerate.num, avctx->framerate.den, low_delay);
133			}
134
135		✗	static void parse_avs2_units(AVCodecParserContext *s, const uint8_t *buf,
136			int buf_size, AVCodecContext *avctx)
137			{
138		✗	if (buf_size < 5)
139		✗	return;
140
141		✗	if (!(buf[0] == 0x0 && buf[1] == 0x0 && buf[2] == 0x1))
142		✗	return;
143
144		✗	switch (buf[3]) {
145		✗	case AVS2_SEQ_START_CODE:
146		✗	parse_avs2_seq_header(s, buf + 4, buf_size - 4, avctx);
147		✗	return;
148		✗	case AVS2_INTRA_PIC_START_CODE:
149		✗	s->key_frame = 1;
150		✗	s->pict_type = AV_PICTURE_TYPE_I;
151		✗	return;
152		✗	case AVS2_INTER_PIC_START_CODE:
153		✗	s->key_frame = 0;
154		✗	if (buf_size > 9) {
155		✗	int pic_code_type = buf[8] & 0x3;
156		✗	if (pic_code_type == 1)
157		✗	s->pict_type = AV_PICTURE_TYPE_P;
158		✗	else if (pic_code_type == 3)
159		✗	s->pict_type = AV_PICTURE_TYPE_S;
160			else
161		✗	s->pict_type = AV_PICTURE_TYPE_B;
162			}
163		✗	return;
164			}
165			}
166
167		✗	static int avs2_parse(AVCodecParserContext *s, AVCodecContext *avctx,
168			const uint8_t **poutbuf, int *poutbuf_size,
169			const uint8_t *buf, int buf_size)
170			{
171		✗	ParseContext *pc = s->priv_data;
172			int next;
173
174		✗	if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) {
175		✗	next = buf_size;
176			} else {
177		✗	next = avs2_find_frame_end(pc, buf, buf_size);
178		✗	if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
179		✗	*poutbuf = NULL;
180		✗	*poutbuf_size = 0;
181		✗	return buf_size;
182			}
183			}
184
185		✗	parse_avs2_units(s, buf, buf_size, avctx);
186
187		✗	*poutbuf = buf;
188		✗	*poutbuf_size = buf_size;
189
190		✗	return next;
191			}
192
193			const FFCodecParser ff_avs2_parser = {
194			PARSER_CODEC_LIST(AV_CODEC_ID_AVS2),
195			.priv_data_size = sizeof(ParseContext),
196			.parse = avs2_parse,
197			.close = ff_parse_close,
198			};
199