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1 | use nihav_core::frame::*; | |
2 | use nihav_core::demuxers::*; | |
3 | ||
4 | struct FLACDemuxer<'a> { | |
5 | src: &'a mut ByteReader<'a>, | |
6 | data_start: u64, | |
7 | tot_samples: u64, | |
8 | cur_samples: u64, | |
9 | blk_samples: u16, | |
10 | min_size: usize, | |
11 | max_size: usize, | |
12 | } | |
13 | ||
14 | impl<'a> FLACDemuxer<'a> { | |
15 | fn new(io: &'a mut ByteReader<'a>) -> Self { | |
16 | Self { | |
17 | src: io, | |
18 | data_start: 0, | |
19 | tot_samples: 0, | |
20 | cur_samples: 0, | |
21 | blk_samples: 0, | |
22 | min_size: 0, | |
23 | max_size: 0, | |
24 | } | |
25 | } | |
26 | } | |
27 | ||
28 | fn update_crc16(crc: u16, byte: u8) -> u16 { | |
29 | (crc << 8) ^ CRC16_TABLE[(((crc >> 8) as u8) ^ byte) as usize] | |
30 | } | |
31 | ||
32 | fn read_utf8(src: &[u8]) -> DemuxerResult<u32> { | |
33 | if (src[0] & 0x80) == 0 { | |
34 | return Ok(u32::from(src[0])); | |
35 | } | |
36 | let len = (!src[0]).leading_zeros() as usize; | |
37 | validate!(len != 1 && len <= 5 && src.len() >= len); | |
38 | let mut val = u32::from(src[0] & 0x1F); | |
39 | for byte in src.iter().take(len).skip(1) { | |
40 | validate!((*byte & 0xC0) == 0x80); | |
41 | val = (val << 6) | u32::from(*byte & 0x3F); | |
42 | } | |
43 | Ok(val) | |
44 | } | |
45 | ||
46 | impl<'a> DemuxCore<'a> for FLACDemuxer<'a> { | |
47 | fn open(&mut self, strmgr: &mut StreamManager, seek_index: &mut SeekIndex) -> DemuxerResult<()> { | |
48 | let tag = self.src.read_tag()?; | |
49 | validate!(&tag == b"fLaC"); | |
50 | let mut streaminfo: Vec<u8> = Vec::new(); | |
51 | let mut srate = 0u32; | |
52 | let mut channels = 0u8; | |
53 | loop { | |
54 | let id1 = self.src.read_byte()?; | |
55 | let len = self.src.read_u24be()? as usize; | |
56 | let id = id1 & 0x7F; | |
57 | ||
58 | match id { | |
59 | 0x00 => { | |
60 | validate!(len >= 34); | |
61 | streaminfo = vec![0u8; len]; | |
62 | self.src.read_buf(&mut streaminfo)?; | |
63 | let min_bs = read_u16be(&streaminfo[0..])?; | |
64 | let max_bs = read_u16be(&streaminfo[2..])?; | |
65 | if min_bs == max_bs { | |
66 | self.blk_samples = max_bs; | |
67 | } | |
68 | self.min_size = read_u24be(&streaminfo[4..])? as usize; | |
69 | self.max_size = read_u24be(&streaminfo[7..])? as usize; | |
70 | let word = read_u24be(&streaminfo[10..])?; | |
71 | srate = word >> 4; | |
72 | channels = (((word >> 1) & 7) + 1) as u8; | |
73 | self.tot_samples = (u64::from(streaminfo[13] & 0xF) << 32) | u64::from(read_u32be(&streaminfo[14..])?); | |
74 | }, | |
75 | 0x03 => { | |
76 | validate!((len % 18) == 0); | |
77 | seek_index.mode = SeekIndexMode::Present; | |
78 | for _ in 0..len / 18 { | |
79 | let sample = self.src.read_u64be()?; | |
80 | let offset = self.src.read_u64be()?; | |
81 | let _nsamps = self.src.read_u16be()?; | |
82 | let time = sample * 1000 / u64::from(srate.max(1000)); | |
83 | seek_index.add_entry(0, SeekEntry { time, pts: sample, pos: offset }); | |
84 | } | |
85 | }, | |
86 | _ => self.src.read_skip(len)?, | |
87 | }; | |
88 | ||
89 | if (id1 & 0x80) != 0 { | |
90 | break; | |
91 | } | |
92 | } | |
93 | self.data_start = self.src.tell(); | |
94 | validate!(srate != 0); | |
95 | ||
96 | let base = if self.blk_samples != 0 { u32::from(self.blk_samples) } else { 1 }; | |
97 | let ahdr = NAAudioInfo::new(srate, channels as u8, SND_S16P_FORMAT, base as usize); | |
98 | let ainfo = NACodecInfo::new("flac", NACodecTypeInfo::Audio(ahdr), Some(streaminfo)); | |
99 | strmgr.add_stream(NAStream::new(StreamType::Audio, 0, ainfo, base, srate)).unwrap(); | |
100 | ||
101 | Ok(()) | |
102 | } | |
103 | fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket> { | |
104 | if self.src.is_eof() || (self.tot_samples != 0 && self.cur_samples == self.tot_samples) { return Err(DemuxerError::EOF); } | |
105 | let mut buf = Vec::with_capacity(self.min_size); | |
106 | let mut crc = 0; | |
107 | for _ in 0..5 { | |
108 | let byte = self.src.read_byte()?; | |
109 | buf.push(byte); | |
110 | crc = update_crc16(crc, byte); | |
111 | } | |
112 | let mut ref_crc = self.src.read_u16be()?; | |
113 | loop { | |
114 | let byte = self.src.read_byte()?; | |
115 | let old_byte = (ref_crc >> 8) as u8; | |
116 | buf.push(old_byte); | |
117 | ref_crc = (ref_crc << 8) | u16::from(byte); | |
118 | crc = update_crc16(crc, old_byte); | |
119 | if buf.len() + 2 >= self.min_size && crc == ref_crc { | |
120 | let ret = self.src.peek_u16be(); | |
121 | if ret.is_err() || ((ret.unwrap_or(0) & 0xFFFE) == 0xFFF8) { | |
122 | buf.push((ref_crc >> 8) as u8); | |
123 | buf.push(ref_crc as u8); | |
124 | break; | |
125 | } | |
126 | } | |
127 | if (self.max_size > 0) && (buf.len() > self.max_size) { | |
128 | return Err(DemuxerError::InvalidData); | |
129 | } | |
130 | if buf.len() > (1 << 23) { | |
131 | return Err(DemuxerError::InvalidData); | |
132 | } | |
133 | } | |
134 | ||
135 | let (duration, pts) = if self.blk_samples != 0 { | |
136 | validate!((buf[1] & 1) == 0); | |
137 | let blkno = u64::from(read_utf8(&buf[4..])?); | |
138 | self.cur_samples = blkno * u64::from(self.blk_samples); | |
139 | (u64::from(self.blk_samples), blkno) | |
140 | } else { | |
141 | validate!((buf[1] & 1) != 0); | |
142 | let blksamps = u64::from(read_utf8(&buf[4..])?); | |
143 | (blksamps, self.cur_samples) | |
144 | }; | |
145 | ||
146 | let stream = strmgr.get_stream(0).unwrap(); | |
147 | let (tb_num, tb_den) = stream.get_timebase(); | |
148 | let ts = NATimeInfo::new(Some(pts), None, Some(duration), tb_num, tb_den); | |
149 | let pkt = NAPacket::new(stream, ts, true, buf); | |
150 | ||
151 | self.cur_samples += duration; | |
152 | ||
153 | Ok(pkt) | |
154 | } | |
155 | fn seek(&mut self, time: NATimePoint, seek_index: &SeekIndex) -> DemuxerResult<()> { | |
156 | let ret = seek_index.find_pos(time); | |
157 | if ret.is_none() { | |
158 | return Err(DemuxerError::SeekError); | |
159 | } | |
160 | let seek_info = ret.unwrap(); | |
161 | self.cur_samples = seek_info.pts; | |
162 | self.src.seek(SeekFrom::Start(self.data_start + seek_info.pos))?; | |
163 | ||
164 | Ok(()) | |
165 | } | |
166 | } | |
167 | ||
168 | impl<'a> NAOptionHandler for FLACDemuxer<'a> { | |
169 | fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] } | |
170 | fn set_options(&mut self, _options: &[NAOption]) { } | |
171 | fn query_option_value(&self, _name: &str) -> Option<NAValue> { None } | |
172 | } | |
173 | ||
174 | pub struct FLACDemuxerCreator { } | |
175 | ||
176 | impl DemuxerCreator for FLACDemuxerCreator { | |
177 | fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a> { | |
178 | Box::new(FLACDemuxer::new(br)) | |
179 | } | |
180 | fn get_name(&self) -> &'static str { "flac" } | |
181 | } | |
182 | ||
183 | #[cfg(test)] | |
184 | mod test { | |
185 | use super::*; | |
186 | use std::fs::File; | |
187 | ||
188 | #[test] | |
189 | fn test_flac_demux() { | |
190 | let mut file = File::open("assets/LLaudio/luckynight.flac").unwrap(); | |
191 | let mut fr = FileReader::new_read(&mut file); | |
192 | let mut br = ByteReader::new(&mut fr); | |
193 | let mut dmx = FLACDemuxer::new(&mut br); | |
194 | let mut sm = StreamManager::new(); | |
195 | let mut si = SeekIndex::new(); | |
196 | dmx.open(&mut sm, &mut si).unwrap(); | |
197 | loop { | |
198 | let pktres = dmx.get_frame(&mut sm); | |
199 | if let Err(e) = pktres { | |
200 | if (e as i32) == (DemuxerError::EOF as i32) { break; } | |
201 | panic!("error"); | |
202 | } | |
203 | let pkt = pktres.unwrap(); | |
204 | println!("Got {}", pkt); | |
205 | } | |
206 | } | |
207 | } | |
208 | ||
209 | const CRC16_TABLE: [u16; 256] = [ | |
210 | 0x0000, 0x8005, 0x800F, 0x000A, 0x801B, 0x001E, 0x0014, 0x8011, | |
211 | 0x8033, 0x0036, 0x003C, 0x8039, 0x0028, 0x802D, 0x8027, 0x0022, | |
212 | 0x8063, 0x0066, 0x006C, 0x8069, 0x0078, 0x807D, 0x8077, 0x0072, | |
213 | 0x0050, 0x8055, 0x805F, 0x005A, 0x804B, 0x004E, 0x0044, 0x8041, | |
214 | 0x80C3, 0x00C6, 0x00CC, 0x80C9, 0x00D8, 0x80DD, 0x80D7, 0x00D2, | |
215 | 0x00F0, 0x80F5, 0x80FF, 0x00FA, 0x80EB, 0x00EE, 0x00E4, 0x80E1, | |
216 | 0x00A0, 0x80A5, 0x80AF, 0x00AA, 0x80BB, 0x00BE, 0x00B4, 0x80B1, | |
217 | 0x8093, 0x0096, 0x009C, 0x8099, 0x0088, 0x808D, 0x8087, 0x0082, | |
218 | 0x8183, 0x0186, 0x018C, 0x8189, 0x0198, 0x819D, 0x8197, 0x0192, | |
219 | 0x01B0, 0x81B5, 0x81BF, 0x01BA, 0x81AB, 0x01AE, 0x01A4, 0x81A1, | |
220 | 0x01E0, 0x81E5, 0x81EF, 0x01EA, 0x81FB, 0x01FE, 0x01F4, 0x81F1, | |
221 | 0x81D3, 0x01D6, 0x01DC, 0x81D9, 0x01C8, 0x81CD, 0x81C7, 0x01C2, | |
222 | 0x0140, 0x8145, 0x814F, 0x014A, 0x815B, 0x015E, 0x0154, 0x8151, | |
223 | 0x8173, 0x0176, 0x017C, 0x8179, 0x0168, 0x816D, 0x8167, 0x0162, | |
224 | 0x8123, 0x0126, 0x012C, 0x8129, 0x0138, 0x813D, 0x8137, 0x0132, | |
225 | 0x0110, 0x8115, 0x811F, 0x011A, 0x810B, 0x010E, 0x0104, 0x8101, | |
226 | 0x8303, 0x0306, 0x030C, 0x8309, 0x0318, 0x831D, 0x8317, 0x0312, | |
227 | 0x0330, 0x8335, 0x833F, 0x033A, 0x832B, 0x032E, 0x0324, 0x8321, | |
228 | 0x0360, 0x8365, 0x836F, 0x036A, 0x837B, 0x037E, 0x0374, 0x8371, | |
229 | 0x8353, 0x0356, 0x035C, 0x8359, 0x0348, 0x834D, 0x8347, 0x0342, | |
230 | 0x03C0, 0x83C5, 0x83CF, 0x03CA, 0x83DB, 0x03DE, 0x03D4, 0x83D1, | |
231 | 0x83F3, 0x03F6, 0x03FC, 0x83F9, 0x03E8, 0x83ED, 0x83E7, 0x03E2, | |
232 | 0x83A3, 0x03A6, 0x03AC, 0x83A9, 0x03B8, 0x83BD, 0x83B7, 0x03B2, | |
233 | 0x0390, 0x8395, 0x839F, 0x039A, 0x838B, 0x038E, 0x0384, 0x8381, | |
234 | 0x0280, 0x8285, 0x828F, 0x028A, 0x829B, 0x029E, 0x0294, 0x8291, | |
235 | 0x82B3, 0x02B6, 0x02BC, 0x82B9, 0x02A8, 0x82AD, 0x82A7, 0x02A2, | |
236 | 0x82E3, 0x02E6, 0x02EC, 0x82E9, 0x02F8, 0x82FD, 0x82F7, 0x02F2, | |
237 | 0x02D0, 0x82D5, 0x82DF, 0x02DA, 0x82CB, 0x02CE, 0x02C4, 0x82C1, | |
238 | 0x8243, 0x0246, 0x024C, 0x8249, 0x0258, 0x825D, 0x8257, 0x0252, | |
239 | 0x0270, 0x8275, 0x827F, 0x027A, 0x826B, 0x026E, 0x0264, 0x8261, | |
240 | 0x0220, 0x8225, 0x822F, 0x022A, 0x823B, 0x023E, 0x0234, 0x8231, | |
241 | 0x8213, 0x0216, 0x021C, 0x8219, 0x0208, 0x820D, 0x8207, 0x0202 | |
242 | ]; |