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Acorn Super Moving Blocks Decoder
[nihav.git] / nihav-mpeg / src / codecs / aac / info.rs
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1use nihav_core::codecs::{DecoderResult, DecoderError};
2use nihav_core::io::bitreader::*;
3use std::fmt;
4
5#[allow(non_camel_case_types)]
6#[derive(Clone,Copy,PartialEq)]
7pub enum M4AType {
8 None,
9 Main,
10 LC,
11 SSR,
12 LTP,
13 SBR,
14 Scalable,
15 TwinVQ,
16 CELP,
17 HVXC,
18 TTSI,
19 MainSynth,
20 WavetableSynth,
21 GeneralMIDI,
22 Algorithmic,
23 ER_AAC_LC,
24 ER_AAC_LTP,
25 ER_AAC_Scalable,
26 ER_TwinVQ,
27 ER_BSAC,
28 ER_AAC_LD,
29 ER_CELP,
30 ER_HVXC,
31 ER_HILN,
32 ER_Parametric,
33 SSC,
34 PS,
35 MPEGSurround,
36 Layer1,
37 Layer2,
38 Layer3,
39 DST,
40 ALS,
41 SLS,
42 SLSNonCore,
43 ER_AAC_ELD,
44 SMRSimple,
45 SMRMain,
46 Reserved,
47 Unknown,
48}
49
50const M4A_TYPES: &[M4AType] = &[
51 M4AType::None, M4AType::Main, M4AType::LC, M4AType::SSR,
52 M4AType::LTP, M4AType::SBR, M4AType::Scalable, M4AType::TwinVQ,
53 M4AType::CELP, M4AType::HVXC, M4AType::Reserved, M4AType::Reserved,
54 M4AType::TTSI, M4AType::MainSynth, M4AType::WavetableSynth, M4AType::GeneralMIDI,
55 M4AType::Algorithmic, M4AType::ER_AAC_LC, M4AType::Reserved, M4AType::ER_AAC_LTP,
56 M4AType::ER_AAC_Scalable, M4AType::ER_TwinVQ, M4AType::ER_BSAC, M4AType::ER_AAC_LD,
57 M4AType::ER_CELP, M4AType::ER_HVXC, M4AType::ER_HILN, M4AType::ER_Parametric,
58 M4AType::SSC, M4AType::PS, M4AType::MPEGSurround, M4AType::Reserved /*escape*/,
59 M4AType::Layer1, M4AType::Layer2, M4AType::Layer3, M4AType::DST,
60 M4AType::ALS, M4AType::SLS, M4AType::SLSNonCore, M4AType::ER_AAC_ELD,
61 M4AType::SMRSimple, M4AType::SMRMain,
62];
63const M4A_TYPE_NAMES: &[&str] = &[
64 "None", "AAC Main", "AAC LC", "AAC SSR", "AAC LTP", "SBR", "AAC Scalable", "TwinVQ", "CELP", "HVXC",
65 /*"(reserved10)", "(reserved11)", */ "TTSI",
66 "Main synthetic", "Wavetable synthesis", "General MIDI", "Algorithmic Synthesis and Audio FX",
67 "ER AAC LC", /*"(reserved18)",*/ "ER AAC LTP", "ER AAC Scalable", "ER TwinVQ", "ER BSAC", "ER AAC LD",
68 "ER CELP", "ER HVXC", "ER HILN", "ER Parametric", "SSC", "PS", "MPEG Surround", /*"(escape)",*/
69 "Layer-1", "Layer-2", "Layer-3", "DST", "ALS", "SLS", "SLS non-core", "ER AAC ELD", "SMR Simple", "SMR Main",
70 "(reserved)", "(unknown)",
71];
72
73impl fmt::Display for M4AType {
74 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
75 write!(f, "{}", M4A_TYPE_NAMES[*self as usize])
76 }
77}
78
79const AAC_SAMPLE_RATES: [u32; 16] = [
80 96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050,
81 16000, 12000, 11025, 8000, 7350, 0, 0, 0
82];
83
84const AAC_CHANNELS: [usize; 8] = [ 0, 1, 2, 3, 4, 5, 6, 8 ];
85
86pub struct M4AInfo {
87 pub otype: M4AType,
88 pub srate: u32,
89 pub channels: usize,
90 pub samples: usize,
91 pub sbr_ps_info: Option<(u32, usize)>,
92 pub sbr_present: bool,
93 pub ps_present: bool,
94}
95
96impl M4AInfo {
97 pub fn new() -> Self {
98 Self {
99 otype: M4AType::None,
100 srate: 0,
101 channels: 0,
102 samples: 0,
103 sbr_ps_info: Option::None,
104 sbr_present: false,
105 ps_present: false,
106 }
107 }
108 fn read_object_type(br: &mut BitReader) -> DecoderResult<M4AType> {
109 let otypeidx;
110 if br.peek(5) == 31 {
111 br.skip(5)?;
112 otypeidx = (br.read(6)? as usize) + 32;
113 } else {
114 otypeidx = br.read(5)? as usize;
115 }
116 if otypeidx >= M4A_TYPES.len() {
117 Ok(M4AType::Unknown)
118 } else {
119 Ok(M4A_TYPES[otypeidx])
120 }
121 }
122 fn read_sampling_frequency(br: &mut BitReader) -> DecoderResult<u32> {
123 if br.peek(4) == 15 {
124 let srate = br.read(24)?;
125 Ok(srate)
126 } else {
127 let srate_idx = br.read(4)? as usize;
128 Ok(AAC_SAMPLE_RATES[srate_idx])
129 }
130 }
131 fn read_channel_config(br: &mut BitReader) -> DecoderResult<usize> {
132 let chidx = br.read(4)? as usize;
133 if chidx < AAC_CHANNELS.len() {
134 Ok(AAC_CHANNELS[chidx])
135 } else {
136 Ok(chidx)
137 }
138 }
139 pub fn read(&mut self, src: &[u8]) -> DecoderResult<()> {
140 let mut br = BitReader::new(src, BitReaderMode::BE);
141 self.otype = Self::read_object_type(&mut br)?;
142 self.srate = Self::read_sampling_frequency(&mut br)?;
143 validate!(self.srate > 0);
144 self.channels = Self::read_channel_config(&mut br)?;
145
146 if (self.otype == M4AType::SBR) || (self.otype == M4AType::PS) {
147 let ext_srate = Self::read_sampling_frequency(&mut br)?;
148 self.otype = Self::read_object_type(&mut br)?;
149 let ext_chans;
150 if self.otype == M4AType::ER_BSAC {
151 ext_chans = Self::read_channel_config(&mut br)?;
152 } else {
153 ext_chans = 0;
154 }
155 self.sbr_ps_info = Some((ext_srate, ext_chans));
156 }
157
158 match self.otype {
159 M4AType::Main | M4AType::LC | M4AType::SSR | M4AType::Scalable | M4AType::TwinVQ |
160 M4AType::ER_AAC_LC | M4AType::ER_AAC_LTP | M4AType::ER_AAC_Scalable | M4AType::ER_TwinVQ |
161 M4AType::ER_BSAC | M4AType::ER_AAC_LD => {
162 // GASpecificConfig
163 let short_frame = br.read_bool()?;
164 self.samples = if short_frame { 960 } else { 1024 };
165 let depends_on_core = br.read_bool()?;
166 if depends_on_core {
167 let _delay = br.read(14)?;
168 }
169 let extension_flag = br.read_bool()?;
170 if self.channels == 0 {
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171 let (channels, sf_code) = skimp_through_program_config_element(&mut br)?;
172 validate!(channels > 0);
173 self.channels = channels;
174 validate!(AAC_SAMPLE_RATES[sf_code] != 0);
175 self.srate = AAC_SAMPLE_RATES[sf_code];
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176 }
177 if (self.otype == M4AType::Scalable) || (self.otype == M4AType::ER_AAC_Scalable) {
178 let _layer = br.read(3)?;
179 }
180 if extension_flag {
181 if self.otype == M4AType::ER_BSAC {
182 let _num_subframes = br.read(5)? as usize;
183 let _layer_length = br.read(11)?;
184 }
185 if (self.otype == M4AType::ER_AAC_LC) ||
186 (self.otype == M4AType::ER_AAC_LTP) ||
187 (self.otype == M4AType::ER_AAC_Scalable) ||
188 (self.otype == M4AType::ER_AAC_LD) {
189 let _section_data_resilience = br.read_bool()?;
190 let _scalefactors_resilience = br.read_bool()?;
191 let _spectral_data_resilience = br.read_bool()?;
192 }
193 let extension_flag3 = br.read_bool()?;
194 if extension_flag3 {
195 unimplemented!("version3 extensions");
196 }
197 }
198 },
199 M4AType::CELP => { unimplemented!("CELP config"); },
200 M4AType::HVXC => { unimplemented!("HVXC config"); },
201 M4AType::TTSI => { unimplemented!("TTS config"); },
202 M4AType::MainSynth | M4AType::WavetableSynth | M4AType::GeneralMIDI | M4AType::Algorithmic => { unimplemented!("structured audio config"); },
203 M4AType::ER_CELP => { unimplemented!("ER CELP config"); },
204 M4AType::ER_HVXC => { unimplemented!("ER HVXC config"); },
205 M4AType::ER_HILN | M4AType::ER_Parametric => { unimplemented!("parametric config"); },
206 M4AType::SSC => { unimplemented!("SSC config"); },
207 M4AType::MPEGSurround => {
208 br.skip(1)?; // sacPayloadEmbedding
209 unimplemented!("MPEG Surround config");
210 },
211 M4AType::Layer1 | M4AType::Layer2 | M4AType::Layer3 => { unimplemented!("MPEG Layer 1/2/3 config"); },
212 M4AType::DST => { unimplemented!("DST config"); },
213 M4AType::ALS => {
214 br.skip(5)?; // fillBits
215 unimplemented!("ALS config");
216 },
217 M4AType::SLS | M4AType::SLSNonCore => { unimplemented!("SLS config"); },
218 M4AType::ER_AAC_ELD => { unimplemented!("ELD config"); },
219 M4AType::SMRSimple | M4AType::SMRMain => { unimplemented!("symbolic music config"); },
220 _ => {},
221 };
222 match self.otype {
223 M4AType::ER_AAC_LC | M4AType::ER_AAC_LTP | M4AType::ER_AAC_Scalable | M4AType::ER_TwinVQ |
224 M4AType::ER_BSAC | M4AType::ER_AAC_LD | M4AType::ER_CELP | M4AType::ER_HVXC |
225 M4AType::ER_HILN | M4AType::ER_Parametric | M4AType::ER_AAC_ELD => {
226 let ep_config = br.read(2)?;
227 if (ep_config == 2) || (ep_config == 3) {
228 unimplemented!("error protection config");
229 }
230 if ep_config == 3 {
231 let direct_mapping = br.read_bool()?;
232 validate!(direct_mapping);
233 }
234 },
235 _ => {},
236 };
237 if self.sbr_ps_info.is_some() && (br.left() >= 16) {
238 let sync = br.read(11)?;
239 if sync == 0x2B7 {
240 let ext_otype = Self::read_object_type(&mut br)?;
241 if ext_otype == M4AType::SBR {
242 self.sbr_present = br.read_bool()?;
243 if self.sbr_present {
244 let _ext_srate = Self::read_sampling_frequency(&mut br)?;
245 if br.left() >= 12 {
246 let sync = br.read(11)?;
247 if sync == 0x548 {
248 self.ps_present = br.read_bool()?;
249 }
250 }
251 }
252 }
253 if ext_otype == M4AType::PS {
254 self.sbr_present = br.read_bool()?;
255 if self.sbr_present {
256 let _ext_srate = Self::read_sampling_frequency(&mut br)?;
257 }
258 let _ext_channels = br.read(4)?;
259 }
260 }
261 }
262
263 Ok(())
264 }
265}
266
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267pub fn skimp_through_program_config_element(br: &mut BitReader) -> DecoderResult<(usize, usize)> {
268 let _id = br.read(4)?;
269 let _object_type = br.read(2)?;
270 let sampling_frequency_index = br.read(4)? as usize;
271 let num_front_channel_elements = br.read(4)? as usize;
272 let num_side_channel_elements = br.read(4)? as usize;
273 let num_back_channel_elements = br.read(4)? as usize;
274 let num_lfe_channel_elements = br.read(2)? as usize;
275 let num_assoc_data_elements = br.read(3)? as usize;
276 let num_valid_cc_elements = br.read(4)? as usize;
277 let mono_mixdown_present = br.read_bool()?;
278 if mono_mixdown_present {
279 let _mono_mixdown_element_number = br.read(4)?;
280 }
281 let stereo_mixdown_present = br.read_bool()?;
282 if stereo_mixdown_present {
283 let _stereo_mixdown_element_number = br.read(4)?;
284 }
285 let matrix_mixdown_idx_present = br.read_bool()?;
286 if matrix_mixdown_idx_present {
287 let _matrix_mixdown_idx = br.read(2)?;
288 let _pseudo_surround_enable = br.read_bool()?;
289 }
290 for _i in 0..num_front_channel_elements {
291 let _front_element_is_cpe = br.read_bool()?;
292 let _front_element_tag_select = br.read(4)?;
293 }
294 for _i in 0..num_side_channel_elements {
295 let _side_element_is_cpe = br.read_bool()?;
296 let _side_element_tag_select = br.read(4)?;
297 }
298 for _i in 0..num_back_channel_elements {
299 let _back_element_is_cpe = br.read_bool()?;
300 let _back_element_tag_select = br.read(4)?;
301 }
302 for _i in 0..num_lfe_channel_elements {
303 let _lfe_element_tag_select = br.read(4)?;
304 }
305 for _i in 0..num_assoc_data_elements {
306 let _assoc_data_element_tag_select = br.read(4)?;
307 }
308 for _i in 0..num_valid_cc_elements {
309 let _cc_element_is_ind_sw = br.read_bool()?;
310 let _valid_cc_element_tag_select = br.read(4)?;
311 }
312 br.align();
313 let comment_field_bytes = br.read(8)?;
314 br.skip(comment_field_bytes * 8)?;
315
316 Ok((num_front_channel_elements +
317 num_side_channel_elements +
318 num_back_channel_elements +
319 num_lfe_channel_elements, sampling_frequency_index))
320}
321
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322impl fmt::Display for M4AInfo {
323 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
324 write!(f, "MPEG 4 Audio {}, {} Hz, {} channels, {} samples per frame",
325 self.otype, self.srate, self.channels, self.samples)
326 }
327}
328