2 * TAK decoder/demuxer common code
3 * Copyright (c) 2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
24 * TAK (Tom's lossless Audio Kompressor) decoder/demuxer common functions
30 #define BITSTREAM_READER_LE
34 #define TAK_FORMAT_DATA_TYPE_BITS 3
35 #define TAK_FORMAT_SAMPLE_RATE_BITS 18
36 #define TAK_FORMAT_BPS_BITS 5
37 #define TAK_FORMAT_CHANNEL_BITS 4
38 #define TAK_FORMAT_VALID_BITS 5
39 #define TAK_FORMAT_CH_LAYOUT_BITS 6
40 #define TAK_SIZE_FRAME_DURATION_BITS 4
41 #define TAK_SIZE_SAMPLES_NUM_BITS 35
42 #define TAK_LAST_FRAME_POS_BITS 40
43 #define TAK_LAST_FRAME_SIZE_BITS 24
44 #define TAK_ENCODER_CODEC_BITS 6
45 #define TAK_ENCODER_PROFILE_BITS 4
46 #define TAK_ENCODER_VERSION_BITS 24
47 #define TAK_SAMPLE_RATE_MIN 6000
48 #define TAK_CHANNELS_MIN 1
50 #define TAK_FRAME_HEADER_FLAGS_BITS 3
51 #define TAK_FRAME_HEADER_SYNC_ID 0xA0FF
52 #define TAK_FRAME_HEADER_SYNC_ID_BITS 16
53 #define TAK_FRAME_HEADER_SAMPLE_COUNT_BITS 14
54 #define TAK_FRAME_HEADER_NO_BITS 21
55 #define TAK_FRAME_DURATION_QUANT_SHIFT 5
56 #define TAK_CRC24_BITS 24
58 #define TAK_MAX_CHANNELS ( 1 << TAK_FORMAT_CHANNEL_BITS )
60 #define TAK_MIN_FRAME_HEADER_BITS ( TAK_FRAME_HEADER_SYNC_ID_BITS + \
61 TAK_FRAME_HEADER_FLAGS_BITS + \
62 TAK_FRAME_HEADER_NO_BITS + \
65 #define TAK_MIN_FRAME_HEADER_LAST_BITS ( TAK_MIN_FRAME_HEADER_BITS + 2 + \
66 TAK_FRAME_HEADER_SAMPLE_COUNT_BITS )
68 #define TAK_ENCODER_BITS ( TAK_ENCODER_CODEC_BITS + \
69 TAK_ENCODER_PROFILE_BITS )
71 #define TAK_SIZE_BITS ( TAK_SIZE_SAMPLES_NUM_BITS + \
72 TAK_SIZE_FRAME_DURATION_BITS )
74 #define TAK_FORMAT_BITS ( TAK_FORMAT_DATA_TYPE_BITS + \
75 TAK_FORMAT_SAMPLE_RATE_BITS + \
76 TAK_FORMAT_BPS_BITS + \
77 TAK_FORMAT_CHANNEL_BITS + 1 + \
78 TAK_FORMAT_VALID_BITS + 1 + \
79 TAK_FORMAT_CH_LAYOUT_BITS * \
82 #define TAK_STREAMINFO_BITS ( TAK_ENCODER_BITS + \
86 #define TAK_MAX_FRAME_HEADER_BITS ( TAK_MIN_FRAME_HEADER_LAST_BITS + \
87 TAK_STREAMINFO_BITS + 31 )
89 #define TAK_STREAMINFO_BYTES (( TAK_STREAMINFO_BITS + 7 ) / 8)
90 #define TAK_MAX_FRAME_HEADER_BYTES (( TAK_MAX_FRAME_HEADER_BITS + 7 ) / 8)
91 #define TAK_MIN_FRAME_HEADER_BYTES (( TAK_MIN_FRAME_HEADER_BITS + 7 ) / 8)
93 enum TAKMetaDataType {
95 TAK_METADATA_STREAMINFO,
96 TAK_METADATA_SEEKTABLE,
97 TAK_METADATA_SIMPLE_WAVE_DATA,
101 TAK_METADATA_LAST_FRAME,
104 enum TAKFrameSizeType {
117 typedef struct TAKStreamInfo {
125 int last_frame_samples;
130 void ff_tak_init_crc(void);
132 int ff_tak_check_crc(const uint8_t *buf, unsigned int buf_size);
135 * Parse the Streaminfo metadata block
136 * @param[in] gb pointer to GetBitContext
137 * @param[out] s where parsed information is stored
139 void avpriv_tak_parse_streaminfo(GetBitContext *gb, TAKStreamInfo *s);
142 * Validate and decode a frame header.
143 * @param avctx AVCodecContext to use as av_log() context
144 * @param[in] gb GetBitContext from which to read frame header
145 * @param[out] s frame information
146 * @param log_level_offset log level offset. can be used to silence error messages.
147 * @return non-zero on error, 0 if ok
149 int ff_tak_decode_frame_header(AVCodecContext *avctx, GetBitContext *gb,
150 TAKStreamInfo *s, int log_level_offset);
151 #endif /* AVCODEC_TAK_H */