path: root/libavcodec/tak.c (plain)
blob: d2670e00ff279db24586426d018ced44c6991c51

1	/*
2	* TAK common code
3	* Copyright (c) 2012 Paul B Mahol
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/crc.h"
23	#include "libavutil/intreadwrite.h"
24
25	#define BITSTREAM_READER_LE
26	#include "tak.h"
27
28	static const int64_t tak_channel_layouts[] = {
29	0,
30	AV_CH_FRONT_LEFT,
31	AV_CH_FRONT_RIGHT,
32	AV_CH_FRONT_CENTER,
33	AV_CH_LOW_FREQUENCY,
34	AV_CH_BACK_LEFT,
35	AV_CH_BACK_RIGHT,
36	AV_CH_FRONT_LEFT_OF_CENTER,
37	AV_CH_FRONT_RIGHT_OF_CENTER,
38	AV_CH_BACK_CENTER,
39	AV_CH_SIDE_LEFT,
40	AV_CH_SIDE_RIGHT,
41	AV_CH_TOP_CENTER,
42	AV_CH_TOP_FRONT_LEFT,
43	AV_CH_TOP_FRONT_CENTER,
44	AV_CH_TOP_FRONT_RIGHT,
45	AV_CH_TOP_BACK_LEFT,
46	AV_CH_TOP_BACK_CENTER,
47	AV_CH_TOP_BACK_RIGHT,
48	};
49
50	static const uint16_t frame_duration_type_quants[] = {
51	3, 4, 6, 8, 4096, 8192, 16384, 512, 1024, 2048,
52	};
53
54	static int tak_get_nb_samples(int sample_rate, enum TAKFrameSizeType type)
55	{
56	int nb_samples, max_nb_samples;
57
58	if (type <= TAK_FST_250ms) {
59	nb_samples = sample_rate * frame_duration_type_quants[type] >>
60	TAK_FRAME_DURATION_QUANT_SHIFT;
61	max_nb_samples = 16384;
62	} else if (type < FF_ARRAY_ELEMS(frame_duration_type_quants)) {
63	nb_samples = frame_duration_type_quants[type];
64	max_nb_samples = sample_rate *
65	frame_duration_type_quants[TAK_FST_250ms] >>
66	TAK_FRAME_DURATION_QUANT_SHIFT;
67	} else {
68	return AVERROR_INVALIDDATA;
69	}
70
71	if (nb_samples <= 0 || nb_samples > max_nb_samples)
72	return AVERROR_INVALIDDATA;
73
74	return nb_samples;
75	}
76
77	int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size)
78	{
79	uint32_t crc, CRC;
80
81	if (buf_size < 4)
82	return AVERROR_INVALIDDATA;
83	buf_size -= 3;
84
85	CRC = AV_RB24(buf + buf_size);
86	crc = av_crc(av_crc_get_table(AV_CRC_24_IEEE), 0xCE04B7U, buf, buf_size);
87	if (CRC != crc)
88	return AVERROR_INVALIDDATA;
89
90	return 0;
91	}
92
93	void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s)
94	{
95	uint64_t channel_mask = 0;
96	int frame_type, i;
97
98	s->codec = get_bits(gb, TAK_ENCODER_CODEC_BITS);
99	skip_bits(gb, TAK_ENCODER_PROFILE_BITS);
100
101	frame_type = get_bits(gb, TAK_SIZE_FRAME_DURATION_BITS);
102	s->samples = get_bits64(gb, TAK_SIZE_SAMPLES_NUM_BITS);
103
104	s->data_type = get_bits(gb, TAK_FORMAT_DATA_TYPE_BITS);
105	s->sample_rate = get_bits(gb, TAK_FORMAT_SAMPLE_RATE_BITS) +
106	TAK_SAMPLE_RATE_MIN;
107	s->bps = get_bits(gb, TAK_FORMAT_BPS_BITS) +
108	TAK_BPS_MIN;
109	s->channels = get_bits(gb, TAK_FORMAT_CHANNEL_BITS) +
110	TAK_CHANNELS_MIN;
111
112	if (get_bits1(gb)) {
113	skip_bits(gb, TAK_FORMAT_VALID_BITS);
114	if (get_bits1(gb)) {
115	for (i = 0; i < s->channels; i++) {
116	int value = get_bits(gb, TAK_FORMAT_CH_LAYOUT_BITS);
117
118	if (value < FF_ARRAY_ELEMS(tak_channel_layouts))
119	channel_mask |= tak_channel_layouts[value];
120	}
121	}
122	}
123
124	s->ch_layout = channel_mask;
125	s->frame_samples = tak_get_nb_samples(s->sample_rate, frame_type);
126	}
127
128	int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
129	TAKStreamInfo *ti, int log_level_offset)
130	{
131	if (get_bits(gb, TAK_FRAME_HEADER_SYNC_ID_BITS) != TAK_FRAME_HEADER_SYNC_ID) {
132	av_log(avctx, AV_LOG_ERROR + log_level_offset, "missing sync id\n");
133	return AVERROR_INVALIDDATA;
134	}
135
136	ti->flags = get_bits(gb, TAK_FRAME_HEADER_FLAGS_BITS);
137	ti->frame_num = get_bits(gb, TAK_FRAME_HEADER_NO_BITS);
138
139	if (ti->flags & TAK_FRAME_FLAG_IS_LAST) {
140	ti->last_frame_samples = get_bits(gb, TAK_FRAME_HEADER_SAMPLE_COUNT_BITS) + 1;
141	skip_bits(gb, 2);
142	} else {
143	ti->last_frame_samples = 0;
144	}
145
146	if (ti->flags & TAK_FRAME_FLAG_HAS_INFO) {
147	avpriv_tak_parse_streaminfo(gb, ti);
148
149	if (get_bits(gb, 6))
150	skip_bits(gb, 25);
151	align_get_bits(gb);
152	}
153
154	if (ti->flags & TAK_FRAME_FLAG_HAS_METADATA)
155	return AVERROR_INVALIDDATA;
156
157	skip_bits(gb, 24);
158
159	return 0;
160	}
161