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87927c57 KS |
1 | use nihav_core::frame::*; |
2 | use nihav_core::demuxers::*; | |
3 | ||
1fb2da78 KS |
4 | #[derive(Clone,Copy,Default)] |
5 | struct FrameSeekInfo { | |
6 | off: u64, | |
7 | size: u64, | |
8 | samplepos: u64, | |
9 | sampleend: u64, | |
10 | } | |
11 | ||
87927c57 KS |
12 | struct FLACDemuxer<'a> { |
13 | src: &'a mut ByteReader<'a>, | |
14 | data_start: u64, | |
15 | tot_samples: u64, | |
16 | cur_samples: u64, | |
17 | blk_samples: u16, | |
1fb2da78 | 18 | min_samples: u16, |
87927c57 KS |
19 | min_size: usize, |
20 | max_size: usize, | |
1fb2da78 KS |
21 | srate: u32, |
22 | known_frames: Vec<FrameSeekInfo>, | |
23 | build_index: bool, | |
87927c57 KS |
24 | } |
25 | ||
26 | impl<'a> FLACDemuxer<'a> { | |
27 | fn new(io: &'a mut ByteReader<'a>) -> Self { | |
28 | Self { | |
29 | src: io, | |
30 | data_start: 0, | |
31 | tot_samples: 0, | |
32 | cur_samples: 0, | |
33 | blk_samples: 0, | |
1fb2da78 | 34 | min_samples: 0, |
87927c57 KS |
35 | min_size: 0, |
36 | max_size: 0, | |
1fb2da78 KS |
37 | srate: 0, |
38 | known_frames: Vec::new(), | |
39 | build_index: false, | |
40 | } | |
41 | } | |
42 | fn read_frame(&mut self) -> DemuxerResult<(Vec<u8>, u64, u64)> { | |
43 | if self.src.is_eof() || (self.tot_samples != 0 && self.cur_samples == self.tot_samples) { return Err(DemuxerError::EOF); } | |
44 | let mut buf = Vec::with_capacity(self.min_size); | |
45 | let mut crc = 0; | |
46 | let frame_start = self.src.tell(); | |
47 | for _ in 0..5 { | |
48 | let byte = self.src.read_byte()?; | |
49 | buf.push(byte); | |
50 | crc = update_crc16(crc, byte); | |
51 | } | |
52 | let mut ref_crc = self.src.read_u16be()?; | |
53 | loop { | |
54 | let byte = self.src.read_byte()?; | |
55 | let old_byte = (ref_crc >> 8) as u8; | |
56 | buf.push(old_byte); | |
57 | ref_crc = (ref_crc << 8) | u16::from(byte); | |
58 | crc = update_crc16(crc, old_byte); | |
59 | if buf.len() + 2 >= self.min_size && crc == ref_crc { | |
60 | let ret = self.src.peek_u16be(); | |
61 | if ret.is_err() || ((ret.unwrap_or(0) & 0xFFFE) == 0xFFF8) { | |
62 | buf.push((ref_crc >> 8) as u8); | |
63 | buf.push(ref_crc as u8); | |
64 | break; | |
65 | } | |
66 | } | |
67 | if (self.max_size > 0) && (buf.len() > self.max_size) { | |
68 | return Err(DemuxerError::InvalidData); | |
69 | } | |
70 | if buf.len() > (1 << 23) { | |
71 | return Err(DemuxerError::InvalidData); | |
72 | } | |
73 | } | |
74 | ||
75 | let (duration, pts) = if self.blk_samples != 0 { | |
76 | validate!((buf[1] & 1) == 0); | |
77 | let blkno = u64::from(read_utf8(&buf[4..])?); | |
78 | self.cur_samples = blkno * u64::from(self.blk_samples); | |
79 | (u64::from(self.blk_samples), blkno) | |
80 | } else { | |
757ee916 KS |
81 | let mut idx = 5; |
82 | while idx < buf.len() && (buf[idx] & 0x80) != 0 { | |
83 | idx += 1; | |
84 | } | |
85 | ||
86 | let bsz_id = buf[2] >> 4; | |
87 | let blksamps = match bsz_id { | |
88 | 0 => return Err(DemuxerError::InvalidData), | |
89 | 1 => 192, | |
90 | 2..=5 => 576 << (bsz_id - 2), | |
91 | 6 => { | |
cc0a023d | 92 | validate!(idx < buf.len()); |
757ee916 KS |
93 | u64::from(buf[idx]) + 1 |
94 | }, | |
95 | 7 => { | |
96 | validate!(idx + 2 <= buf.len()); | |
97 | u64::from(buf[idx]) * 256 + u64::from(buf[idx + 1]) + 1 | |
98 | }, | |
99 | _ => 256 << (bsz_id - 8), | |
100 | }; | |
101 | let pts = u64::from(read_utf8(&buf[4..])?); | |
5181ac4d | 102 | |
757ee916 | 103 | validate!(idx < buf.len()); |
5181ac4d | 104 | |
757ee916 | 105 | (blksamps, pts) |
1fb2da78 KS |
106 | }; |
107 | ||
108 | let spos = if self.blk_samples != 0 { pts * u64::from(self.blk_samples) } else { pts }; | |
109 | if self.build_index && (self.known_frames.is_empty() || self.known_frames.last().unwrap_or(&FrameSeekInfo::default()).samplepos < spos) { | |
110 | let sampleend = spos + duration; | |
111 | self.known_frames.push(FrameSeekInfo{off: frame_start, size: buf.len() as u64, samplepos: spos, sampleend }); | |
87927c57 | 112 | } |
1fb2da78 KS |
113 | |
114 | self.cur_samples += duration; | |
115 | ||
116 | Ok((buf, pts, duration)) | |
87927c57 KS |
117 | } |
118 | } | |
119 | ||
120 | fn update_crc16(crc: u16, byte: u8) -> u16 { | |
121 | (crc << 8) ^ CRC16_TABLE[(((crc >> 8) as u8) ^ byte) as usize] | |
122 | } | |
123 | ||
124 | fn read_utf8(src: &[u8]) -> DemuxerResult<u32> { | |
125 | if (src[0] & 0x80) == 0 { | |
126 | return Ok(u32::from(src[0])); | |
127 | } | |
128 | let len = (!src[0]).leading_zeros() as usize; | |
129 | validate!(len != 1 && len <= 5 && src.len() >= len); | |
130 | let mut val = u32::from(src[0] & 0x1F); | |
131 | for byte in src.iter().take(len).skip(1) { | |
132 | validate!((*byte & 0xC0) == 0x80); | |
133 | val = (val << 6) | u32::from(*byte & 0x3F); | |
134 | } | |
135 | Ok(val) | |
136 | } | |
137 | ||
138 | impl<'a> DemuxCore<'a> for FLACDemuxer<'a> { | |
139 | fn open(&mut self, strmgr: &mut StreamManager, seek_index: &mut SeekIndex) -> DemuxerResult<()> { | |
140 | let tag = self.src.read_tag()?; | |
141 | validate!(&tag == b"fLaC"); | |
142 | let mut streaminfo: Vec<u8> = Vec::new(); | |
143 | let mut srate = 0u32; | |
144 | let mut channels = 0u8; | |
145 | loop { | |
146 | let id1 = self.src.read_byte()?; | |
147 | let len = self.src.read_u24be()? as usize; | |
148 | let id = id1 & 0x7F; | |
149 | ||
150 | match id { | |
151 | 0x00 => { | |
152 | validate!(len >= 34); | |
153 | streaminfo = vec![0u8; len]; | |
154 | self.src.read_buf(&mut streaminfo)?; | |
155 | let min_bs = read_u16be(&streaminfo[0..])?; | |
156 | let max_bs = read_u16be(&streaminfo[2..])?; | |
157 | if min_bs == max_bs { | |
158 | self.blk_samples = max_bs; | |
159 | } | |
1fb2da78 | 160 | self.min_samples = min_bs; |
87927c57 KS |
161 | self.min_size = read_u24be(&streaminfo[4..])? as usize; |
162 | self.max_size = read_u24be(&streaminfo[7..])? as usize; | |
163 | let word = read_u24be(&streaminfo[10..])?; | |
164 | srate = word >> 4; | |
165 | channels = (((word >> 1) & 7) + 1) as u8; | |
166 | self.tot_samples = (u64::from(streaminfo[13] & 0xF) << 32) | u64::from(read_u32be(&streaminfo[14..])?); | |
167 | }, | |
168 | 0x03 => { | |
169 | validate!((len % 18) == 0); | |
170 | seek_index.mode = SeekIndexMode::Present; | |
171 | for _ in 0..len / 18 { | |
172 | let sample = self.src.read_u64be()?; | |
173 | let offset = self.src.read_u64be()?; | |
174 | let _nsamps = self.src.read_u16be()?; | |
175 | let time = sample * 1000 / u64::from(srate.max(1000)); | |
176 | seek_index.add_entry(0, SeekEntry { time, pts: sample, pos: offset }); | |
177 | } | |
178 | }, | |
179 | _ => self.src.read_skip(len)?, | |
180 | }; | |
181 | ||
182 | if (id1 & 0x80) != 0 { | |
183 | break; | |
184 | } | |
185 | } | |
1fb2da78 KS |
186 | if seek_index.mode != SeekIndexMode::Present { |
187 | let min_size = if self.min_samples != 0 { self.min_samples } else { 2048 }; | |
188 | let nframes = self.tot_samples as usize / (min_size as usize); | |
189 | self.known_frames = Vec::with_capacity(nframes.max(1)); | |
190 | seek_index.mode = SeekIndexMode::Automatic; | |
191 | self.build_index = true; | |
192 | } else { | |
193 | self.build_index = false; | |
194 | } | |
87927c57 KS |
195 | self.data_start = self.src.tell(); |
196 | validate!(srate != 0); | |
1fb2da78 | 197 | self.srate = srate; |
87927c57 KS |
198 | |
199 | let base = if self.blk_samples != 0 { u32::from(self.blk_samples) } else { 1 }; | |
200 | let ahdr = NAAudioInfo::new(srate, channels as u8, SND_S16P_FORMAT, base as usize); | |
201 | let ainfo = NACodecInfo::new("flac", NACodecTypeInfo::Audio(ahdr), Some(streaminfo)); | |
a480a0de | 202 | strmgr.add_stream(NAStream::new(StreamType::Audio, 0, ainfo, base, srate, 0)).unwrap(); |
87927c57 KS |
203 | |
204 | Ok(()) | |
205 | } | |
206 | fn get_frame(&mut self, strmgr: &mut StreamManager) -> DemuxerResult<NAPacket> { | |
1fb2da78 | 207 | let (buf, pts, duration) = self.read_frame()?; |
87927c57 KS |
208 | |
209 | let stream = strmgr.get_stream(0).unwrap(); | |
210 | let (tb_num, tb_den) = stream.get_timebase(); | |
211 | let ts = NATimeInfo::new(Some(pts), None, Some(duration), tb_num, tb_den); | |
212 | let pkt = NAPacket::new(stream, ts, true, buf); | |
213 | ||
87927c57 KS |
214 | Ok(pkt) |
215 | } | |
216 | fn seek(&mut self, time: NATimePoint, seek_index: &SeekIndex) -> DemuxerResult<()> { | |
1fb2da78 KS |
217 | if seek_index.mode == SeekIndexMode::Present { |
218 | let ret = seek_index.find_pos(time); | |
219 | if ret.is_none() { | |
220 | return Err(DemuxerError::SeekError); | |
221 | } | |
222 | let seek_info = ret.unwrap(); | |
223 | self.cur_samples = seek_info.pts; | |
224 | self.src.seek(SeekFrom::Start(self.data_start + seek_info.pos))?; | |
225 | Ok(()) | |
226 | } else if let NATimePoint::Milliseconds(ms) = time { | |
edad6765 | 227 | let samppos = NATimeInfo::time_to_ts(ms, 1000, 1, self.srate); |
1fb2da78 KS |
228 | if self.known_frames.last().unwrap_or(&FrameSeekInfo::default()).sampleend >= samppos { |
229 | for point in self.known_frames.iter().rev() { | |
230 | if point.samplepos <= samppos { | |
231 | self.src.seek(SeekFrom::Start(point.off))?; | |
232 | self.cur_samples = point.samplepos; | |
233 | return Ok(()); | |
234 | } | |
235 | } | |
236 | } else { | |
237 | let startinfo = FrameSeekInfo { off: self.data_start, size: 0, samplepos: 0, sampleend: 0 }; | |
238 | let lentry = self.known_frames.last().unwrap_or(&startinfo); | |
239 | ||
240 | self.src.seek(SeekFrom::Start(lentry.off + lentry.size))?; | |
241 | self.cur_samples = lentry.sampleend; | |
242 | loop { | |
243 | let frame_start = self.src.tell(); | |
244 | let ret = self.read_frame(); | |
245 | if ret.is_err() { | |
246 | return Err(DemuxerError::SeekError); | |
247 | } | |
248 | let (_, pts, duration) = ret.unwrap(); | |
249 | self.cur_samples = pts; | |
250 | if self.blk_samples != 0 { | |
251 | self.cur_samples *= u64::from(self.blk_samples); | |
252 | } | |
253 | if self.cur_samples <= samppos && self.cur_samples + duration >= samppos { | |
254 | self.src.seek(SeekFrom::Start(frame_start))?; | |
255 | return Ok(()); | |
256 | } | |
257 | } | |
258 | } | |
259 | Err(DemuxerError::SeekError) | |
260 | } else { | |
261 | Err(DemuxerError::NotPossible) | |
87927c57 | 262 | } |
87927c57 | 263 | } |
a480a0de | 264 | fn get_duration(&self) -> u64 { self.tot_samples * 1000 / u64::from(self.srate) } |
87927c57 KS |
265 | } |
266 | ||
267 | impl<'a> NAOptionHandler for FLACDemuxer<'a> { | |
268 | fn get_supported_options(&self) -> &[NAOptionDefinition] { &[] } | |
269 | fn set_options(&mut self, _options: &[NAOption]) { } | |
270 | fn query_option_value(&self, _name: &str) -> Option<NAValue> { None } | |
271 | } | |
272 | ||
273 | pub struct FLACDemuxerCreator { } | |
274 | ||
275 | impl DemuxerCreator for FLACDemuxerCreator { | |
276 | fn new_demuxer<'a>(&self, br: &'a mut ByteReader<'a>) -> Box<dyn DemuxCore<'a> + 'a> { | |
277 | Box::new(FLACDemuxer::new(br)) | |
278 | } | |
279 | fn get_name(&self) -> &'static str { "flac" } | |
280 | } | |
281 | ||
282 | #[cfg(test)] | |
283 | mod test { | |
284 | use super::*; | |
285 | use std::fs::File; | |
286 | ||
287 | #[test] | |
288 | fn test_flac_demux() { | |
886cde48 | 289 | // sample: https://samples.mplayerhq.hu/A-codecs/lossless/luckynight.flac |
87927c57 KS |
290 | let mut file = File::open("assets/LLaudio/luckynight.flac").unwrap(); |
291 | let mut fr = FileReader::new_read(&mut file); | |
292 | let mut br = ByteReader::new(&mut fr); | |
293 | let mut dmx = FLACDemuxer::new(&mut br); | |
294 | let mut sm = StreamManager::new(); | |
295 | let mut si = SeekIndex::new(); | |
296 | dmx.open(&mut sm, &mut si).unwrap(); | |
297 | loop { | |
298 | let pktres = dmx.get_frame(&mut sm); | |
299 | if let Err(e) = pktres { | |
300 | if (e as i32) == (DemuxerError::EOF as i32) { break; } | |
301 | panic!("error"); | |
302 | } | |
303 | let pkt = pktres.unwrap(); | |
304 | println!("Got {}", pkt); | |
305 | } | |
306 | } | |
307 | } | |
308 | ||
309 | const CRC16_TABLE: [u16; 256] = [ | |
310 | 0x0000, 0x8005, 0x800F, 0x000A, 0x801B, 0x001E, 0x0014, 0x8011, | |
311 | 0x8033, 0x0036, 0x003C, 0x8039, 0x0028, 0x802D, 0x8027, 0x0022, | |
312 | 0x8063, 0x0066, 0x006C, 0x8069, 0x0078, 0x807D, 0x8077, 0x0072, | |
313 | 0x0050, 0x8055, 0x805F, 0x005A, 0x804B, 0x004E, 0x0044, 0x8041, | |
314 | 0x80C3, 0x00C6, 0x00CC, 0x80C9, 0x00D8, 0x80DD, 0x80D7, 0x00D2, | |
315 | 0x00F0, 0x80F5, 0x80FF, 0x00FA, 0x80EB, 0x00EE, 0x00E4, 0x80E1, | |
316 | 0x00A0, 0x80A5, 0x80AF, 0x00AA, 0x80BB, 0x00BE, 0x00B4, 0x80B1, | |
317 | 0x8093, 0x0096, 0x009C, 0x8099, 0x0088, 0x808D, 0x8087, 0x0082, | |
318 | 0x8183, 0x0186, 0x018C, 0x8189, 0x0198, 0x819D, 0x8197, 0x0192, | |
319 | 0x01B0, 0x81B5, 0x81BF, 0x01BA, 0x81AB, 0x01AE, 0x01A4, 0x81A1, | |
320 | 0x01E0, 0x81E5, 0x81EF, 0x01EA, 0x81FB, 0x01FE, 0x01F4, 0x81F1, | |
321 | 0x81D3, 0x01D6, 0x01DC, 0x81D9, 0x01C8, 0x81CD, 0x81C7, 0x01C2, | |
322 | 0x0140, 0x8145, 0x814F, 0x014A, 0x815B, 0x015E, 0x0154, 0x8151, | |
323 | 0x8173, 0x0176, 0x017C, 0x8179, 0x0168, 0x816D, 0x8167, 0x0162, | |
324 | 0x8123, 0x0126, 0x012C, 0x8129, 0x0138, 0x813D, 0x8137, 0x0132, | |
325 | 0x0110, 0x8115, 0x811F, 0x011A, 0x810B, 0x010E, 0x0104, 0x8101, | |
326 | 0x8303, 0x0306, 0x030C, 0x8309, 0x0318, 0x831D, 0x8317, 0x0312, | |
327 | 0x0330, 0x8335, 0x833F, 0x033A, 0x832B, 0x032E, 0x0324, 0x8321, | |
328 | 0x0360, 0x8365, 0x836F, 0x036A, 0x837B, 0x037E, 0x0374, 0x8371, | |
329 | 0x8353, 0x0356, 0x035C, 0x8359, 0x0348, 0x834D, 0x8347, 0x0342, | |
330 | 0x03C0, 0x83C5, 0x83CF, 0x03CA, 0x83DB, 0x03DE, 0x03D4, 0x83D1, | |
331 | 0x83F3, 0x03F6, 0x03FC, 0x83F9, 0x03E8, 0x83ED, 0x83E7, 0x03E2, | |
332 | 0x83A3, 0x03A6, 0x03AC, 0x83A9, 0x03B8, 0x83BD, 0x83B7, 0x03B2, | |
333 | 0x0390, 0x8395, 0x839F, 0x039A, 0x838B, 0x038E, 0x0384, 0x8381, | |
334 | 0x0280, 0x8285, 0x828F, 0x028A, 0x829B, 0x029E, 0x0294, 0x8291, | |
335 | 0x82B3, 0x02B6, 0x02BC, 0x82B9, 0x02A8, 0x82AD, 0x82A7, 0x02A2, | |
336 | 0x82E3, 0x02E6, 0x02EC, 0x82E9, 0x02F8, 0x82FD, 0x82F7, 0x02F2, | |
337 | 0x02D0, 0x82D5, 0x82DF, 0x02DA, 0x82CB, 0x02CE, 0x02C4, 0x82C1, | |
338 | 0x8243, 0x0246, 0x024C, 0x8249, 0x0258, 0x825D, 0x8257, 0x0252, | |
339 | 0x0270, 0x8275, 0x827F, 0x027A, 0x826B, 0x026E, 0x0264, 0x8261, | |
340 | 0x0220, 0x8225, 0x822F, 0x022A, 0x823B, 0x023E, 0x0234, 0x8231, | |
341 | 0x8213, 0x0216, 0x021C, 0x8219, 0x0208, 0x820D, 0x8207, 0x0202 | |
342 | ]; |