dvb_si/tables/
pmt.rs

1//! Program Map Table — MPEG-2 ISO/IEC 13818-1 §2.4.4.8.
2//!
3//! PMT describes the elementary streams that make up one programme.
4//! Carried on a per-programme PID signalled by the PAT, with table_id 0x02.
5//! Descriptor parsing is out of scope for this commit — raw bytes only.
6
7use crate::descriptors::DescriptorLoop;
8use crate::error::{Error, Result};
9use dvb_common::{Parse, Serialize};
10
11/// PMT table_id (ISO/IEC 13818-1 Table 2-30).
12pub const TABLE_ID: u8 = 0x02;
13/// PMT PIDs are programme-specific and signalled via PAT; 0x0000 is a
14/// placeholder meaning "no well-known PID".
15pub const PID: u16 = 0x0000;
16
17const MIN_HEADER_LEN: usize = 3;
18const EXTENSION_HEADER_LEN: usize = 5;
19const PCR_PID_LEN: usize = 2;
20const PROG_INFO_LEN_BYTES: usize = 2;
21const CRC_LEN: usize = 4;
22const MIN_SECTION_LEN: usize =
23    MIN_HEADER_LEN + EXTENSION_HEADER_LEN + PCR_PID_LEN + PROG_INFO_LEN_BYTES + CRC_LEN;
24const STREAM_HEADER_LEN: usize = 5;
25
26/// Stream type coding — Rec. ITU-T H.222.0 (06/2021) Table 2-34.
27///
28/// Identifies the elementary-stream type carried in the associated PID.
29/// Values `0x80`–`0xFF` are user private; only well-established entries
30/// cited to their own specs are named — the rest fall through to
31/// [`UserPrivate`](Self::UserPrivate).
32///
33/// # Examples
34/// ```
35/// use dvb_si::tables::pmt::StreamType;
36///
37/// assert_eq!(StreamType::from_u8(0x02).name(), "MPEG-2 Video");
38/// assert_eq!(StreamType::from_u8(0x1B).to_u8(), 0x1B); // H.264, lossless round-trip
39/// ```
40/// A parsed `PmtStream.stream_type` is already a `StreamType` — match on it directly.
41#[derive(Debug, Clone, Copy, PartialEq, Eq)]
42#[cfg_attr(feature = "serde", derive(serde::Serialize))]
43#[non_exhaustive]
44pub enum StreamType {
45    /// 0x00 — ITU-T | ISO/IEC Reserved.
46    Reserved,
47    /// 0x01 — ISO/IEC 11172-2 Video (MPEG-1 video).
48    Mpeg1Video,
49    /// 0x02 — Rec. ITU-T H.262 | ISO/IEC 13818-2 Video (MPEG-2 video).
50    Mpeg2Video,
51    /// 0x03 — ISO/IEC 11172-3 Audio (MPEG-1 audio).
52    Mpeg1Audio,
53    /// 0x04 — ISO/IEC 13818-3 Audio (MPEG-2 audio).
54    Mpeg2Audio,
55    /// 0x05 — Rec. ITU-T H.222.0 | ISO/IEC 13818-1 private_sections.
56    PrivateSections,
57    /// 0x06 — Rec. ITU-T H.222.0 | ISO/IEC 13818-1 PES packets containing private data.
58    PesPrivateData,
59    /// 0x07 — ISO/IEC 13522 MHEG.
60    Mheg,
61    /// 0x08 — Rec. ITU-T H.222.0 | ISO/IEC 13818-1 Annex A DSM-CC.
62    DsmCc,
63    /// 0x09 — Rec. ITU-T H.222.1.
64    H222_1,
65    /// 0x0A — ISO/IEC 13818-6 type A.
66    Iso13818_6TypeA,
67    /// 0x0B — ISO/IEC 13818-6 type B.
68    Iso13818_6TypeB,
69    /// 0x0C — ISO/IEC 13818-6 type C.
70    Iso13818_6TypeC,
71    /// 0x0D — ISO/IEC 13818-6 type D.
72    Iso13818_6TypeD,
73    /// 0x0E — Rec. ITU-T H.222.0 | ISO/IEC 13818-1 auxiliary.
74    Auxiliary,
75    /// 0x0F — ISO/IEC 13818-7 Audio with ADTS transport syntax (AAC).
76    AacAdts,
77    /// 0x10 — ISO/IEC 14496-2 Visual (MPEG-4 video).
78    Mpeg4Video,
79    /// 0x11 — ISO/IEC 14496-3 Audio with LATM transport syntax (AAC LATM).
80    AacLatm,
81    /// 0x12 — ISO/IEC 14496-1 SL-packetized / FlexMux stream in PES.
82    SlFlexMuxPes,
83    /// 0x13 — ISO/IEC 14496-1 SL-packetized / FlexMux stream in sections.
84    SlFlexMuxSections,
85    /// 0x14 — ISO/IEC 13818-6 Synchronized Download Protocol.
86    SyncDownload,
87    /// 0x15 — Metadata carried in PES packets.
88    MetadataPes,
89    /// 0x16 — Metadata carried in metadata_sections.
90    MetadataSections,
91    /// 0x17 — Metadata carried in ISO/IEC 13818-6 Data Carousel.
92    MetadataDataCarousel,
93    /// 0x18 — Metadata carried in ISO/IEC 13818-6 Object Carousel.
94    MetadataObjectCarousel,
95    /// 0x19 — Metadata carried in ISO/IEC 13818-6 Synchronized Download Protocol.
96    MetadataSyncDownload,
97    /// 0x1A — IPMP stream (ISO/IEC 13818-11, MPEG-2 IPMP).
98    Ipmp,
99    /// 0x1B — AVC video stream (Rec. ITU-T H.264 | ISO/IEC 14496-10).
100    H264,
101    /// 0x1C — ISO/IEC 14496-3 Audio without additional transport syntax (DST, ALS, SLS).
102    Iso14496_3Audio,
103    /// 0x1D — ISO/IEC 14496-17 Text.
104    Iso14496_17Text,
105    /// 0x1E — Auxiliary video stream (ISO/IEC 23002-3).
106    AuxiliaryVideo,
107    /// 0x1F — SVC video sub-bitstream of an AVC video stream (H.264 Annex G).
108    Svc,
109    /// 0x20 — MVC video sub-bitstream of an AVC video stream (H.264 Annex H).
110    Mvc,
111    /// 0x21 — JPEG 2000 video (Rec. ITU-T T.800 | ISO/IEC 15444-1).
112    Jpeg2000,
113    /// 0x22 — Additional view H.262 | ISO/IEC 13818-2 video for service-compatible stereoscopic 3D.
114    AdditionalViewH262,
115    /// 0x23 — Additional view H.264 | ISO/IEC 14496-10 video for service-compatible stereoscopic 3D.
116    AdditionalViewH264,
117    /// 0x24 — Rec. ITU-T H.265 | ISO/IEC 23008-2 video (HEVC) or HEVC temporal sub-bitstream.
118    Hevc,
119    /// 0x25 — HEVC temporal video subset (H.265 Annex A profiles).
120    HevcTemporalSubset,
121    /// 0x26 — MVCD video sub-bitstream of an AVC video stream (H.264 Annex I).
122    Mvcd,
123    /// 0x27 — Timeline and External Media Information (TEMI, H.222.0 Annex U).
124    Temi,
125    /// 0x28 — HEVC enhancement sub-partition incl. TemporalId 0 (H.265 Annex G).
126    HevcAnnexG,
127    /// 0x29 — HEVC temporal enhancement sub-partition (H.265 Annex G).
128    HevcAnnexGTemporal,
129    /// 0x2A — HEVC enhancement sub-partition incl. TemporalId 0 (H.265 Annex H).
130    HevcAnnexH,
131    /// 0x2B — HEVC temporal enhancement sub-partition (H.265 Annex H).
132    HevcAnnexHTemporal,
133    /// 0x2C — Green access units carried in MPEG-2 sections.
134    GreenAccessUnits,
135    /// 0x2D — ISO/IEC 23008-3 Audio with MHAS transport syntax — main stream.
136    MhasAudioMain,
137    /// 0x2E — ISO/IEC 23008-3 Audio with MHAS transport syntax — auxiliary stream.
138    MhasAudioAux,
139    /// 0x2F — Quality access units carried in sections.
140    QualityAccessUnits,
141    /// 0x30 — Media Orchestration Access Units carried in sections.
142    MediaOrchestration,
143    /// 0x31 — MCTS substream of an H.265 | ISO/IEC 23008-2 video stream.
144    MctsHevc,
145    /// 0x32 — JPEG XS video stream (ISO/IEC 21122-2 profiles).
146    JpegXs,
147    /// 0x33 — VVC video stream (Rec. ITU-T H.266 | ISO/IEC 23090-3) or VVC temporal sub-bitstream.
148    Vvc,
149    /// 0x34 — VVC temporal video subset (H.266 Annex A profiles).
150    VvcTemporalSubset,
151    /// 0x35 — EVC video stream or EVC temporal sub-bitstream (ISO/IEC 23094-1).
152    Evc,
153    /// 0x81 — ATSC AC-3 audio (A/52).
154    Ac3,
155    /// 0x86 — SCTE-35 splice_info_section (ANSI/SCTE 35).
156    Scte35,
157    /// 0x87 — ATSC E-AC-3 / Dolby Digital Plus audio (A/52B).
158    EAc3,
159    /// 0x7F — IPMP stream (H.222.0 Table 2-34).
160    IpmpHigh,
161    /// Rec. ITU-T H.222.0 reserved range `0x36`..=`0x7E`.
162    ReservedRange(u8),
163    /// User private range `0x80`..=`0xFF` (except named entries).
164    UserPrivate(u8),
165}
166
167impl StreamType {
168    /// Decode from the wire byte. Every byte maps to a variant (lossless).
169    #[must_use]
170    pub fn from_u8(v: u8) -> Self {
171        match v {
172            0x00 => Self::Reserved,
173            0x01 => Self::Mpeg1Video,
174            0x02 => Self::Mpeg2Video,
175            0x03 => Self::Mpeg1Audio,
176            0x04 => Self::Mpeg2Audio,
177            0x05 => Self::PrivateSections,
178            0x06 => Self::PesPrivateData,
179            0x07 => Self::Mheg,
180            0x08 => Self::DsmCc,
181            0x09 => Self::H222_1,
182            0x0A => Self::Iso13818_6TypeA,
183            0x0B => Self::Iso13818_6TypeB,
184            0x0C => Self::Iso13818_6TypeC,
185            0x0D => Self::Iso13818_6TypeD,
186            0x0E => Self::Auxiliary,
187            0x0F => Self::AacAdts,
188            0x10 => Self::Mpeg4Video,
189            0x11 => Self::AacLatm,
190            0x12 => Self::SlFlexMuxPes,
191            0x13 => Self::SlFlexMuxSections,
192            0x14 => Self::SyncDownload,
193            0x15 => Self::MetadataPes,
194            0x16 => Self::MetadataSections,
195            0x17 => Self::MetadataDataCarousel,
196            0x18 => Self::MetadataObjectCarousel,
197            0x19 => Self::MetadataSyncDownload,
198            0x1A => Self::Ipmp,
199            0x1B => Self::H264,
200            0x1C => Self::Iso14496_3Audio,
201            0x1D => Self::Iso14496_17Text,
202            0x1E => Self::AuxiliaryVideo,
203            0x1F => Self::Svc,
204            0x20 => Self::Mvc,
205            0x21 => Self::Jpeg2000,
206            0x22 => Self::AdditionalViewH262,
207            0x23 => Self::AdditionalViewH264,
208            0x24 => Self::Hevc,
209            0x25 => Self::HevcTemporalSubset,
210            0x26 => Self::Mvcd,
211            0x27 => Self::Temi,
212            0x28 => Self::HevcAnnexG,
213            0x29 => Self::HevcAnnexGTemporal,
214            0x2A => Self::HevcAnnexH,
215            0x2B => Self::HevcAnnexHTemporal,
216            0x2C => Self::GreenAccessUnits,
217            0x2D => Self::MhasAudioMain,
218            0x2E => Self::MhasAudioAux,
219            0x2F => Self::QualityAccessUnits,
220            0x30 => Self::MediaOrchestration,
221            0x31 => Self::MctsHevc,
222            0x32 => Self::JpegXs,
223            0x33 => Self::Vvc,
224            0x34 => Self::VvcTemporalSubset,
225            0x35 => Self::Evc,
226            0x36..=0x7E => Self::ReservedRange(v),
227            0x7F => Self::IpmpHigh,
228            0x81 => Self::Ac3,
229            0x86 => Self::Scte35,
230            0x87 => Self::EAc3,
231            _ => Self::UserPrivate(v),
232        }
233    }
234
235    /// Encode to the wire byte. Inverse of `from_u8`.
236    #[must_use]
237    pub fn to_u8(self) -> u8 {
238        match self {
239            Self::Reserved => 0x00,
240            Self::Mpeg1Video => 0x01,
241            Self::Mpeg2Video => 0x02,
242            Self::Mpeg1Audio => 0x03,
243            Self::Mpeg2Audio => 0x04,
244            Self::PrivateSections => 0x05,
245            Self::PesPrivateData => 0x06,
246            Self::Mheg => 0x07,
247            Self::DsmCc => 0x08,
248            Self::H222_1 => 0x09,
249            Self::Iso13818_6TypeA => 0x0A,
250            Self::Iso13818_6TypeB => 0x0B,
251            Self::Iso13818_6TypeC => 0x0C,
252            Self::Iso13818_6TypeD => 0x0D,
253            Self::Auxiliary => 0x0E,
254            Self::AacAdts => 0x0F,
255            Self::Mpeg4Video => 0x10,
256            Self::AacLatm => 0x11,
257            Self::SlFlexMuxPes => 0x12,
258            Self::SlFlexMuxSections => 0x13,
259            Self::SyncDownload => 0x14,
260            Self::MetadataPes => 0x15,
261            Self::MetadataSections => 0x16,
262            Self::MetadataDataCarousel => 0x17,
263            Self::MetadataObjectCarousel => 0x18,
264            Self::MetadataSyncDownload => 0x19,
265            Self::Ipmp => 0x1A,
266            Self::H264 => 0x1B,
267            Self::Iso14496_3Audio => 0x1C,
268            Self::Iso14496_17Text => 0x1D,
269            Self::AuxiliaryVideo => 0x1E,
270            Self::Svc => 0x1F,
271            Self::Mvc => 0x20,
272            Self::Jpeg2000 => 0x21,
273            Self::AdditionalViewH262 => 0x22,
274            Self::AdditionalViewH264 => 0x23,
275            Self::Hevc => 0x24,
276            Self::HevcTemporalSubset => 0x25,
277            Self::Mvcd => 0x26,
278            Self::Temi => 0x27,
279            Self::HevcAnnexG => 0x28,
280            Self::HevcAnnexGTemporal => 0x29,
281            Self::HevcAnnexH => 0x2A,
282            Self::HevcAnnexHTemporal => 0x2B,
283            Self::GreenAccessUnits => 0x2C,
284            Self::MhasAudioMain => 0x2D,
285            Self::MhasAudioAux => 0x2E,
286            Self::QualityAccessUnits => 0x2F,
287            Self::MediaOrchestration => 0x30,
288            Self::MctsHevc => 0x31,
289            Self::JpegXs => 0x32,
290            Self::Vvc => 0x33,
291            Self::VvcTemporalSubset => 0x34,
292            Self::Evc => 0x35,
293            Self::IpmpHigh => 0x7F,
294            Self::Ac3 => 0x81,
295            Self::Scte35 => 0x86,
296            Self::EAc3 => 0x87,
297            Self::ReservedRange(v) | Self::UserPrivate(v) => v,
298        }
299    }
300
301    /// Human-readable spec display name.
302    #[must_use]
303    pub fn name(self) -> &'static str {
304        match self {
305            Self::Reserved => "Reserved",
306            Self::Mpeg1Video => "MPEG-1 Video",
307            Self::Mpeg2Video => "MPEG-2 Video",
308            Self::Mpeg1Audio => "MPEG-1 Audio",
309            Self::Mpeg2Audio => "MPEG-2 Audio",
310            Self::PrivateSections => "Private Sections",
311            Self::PesPrivateData => "PES Private Data",
312            Self::Mheg => "MHEG",
313            Self::DsmCc => "DSM-CC",
314            Self::H222_1 => "H.222.1",
315            Self::Iso13818_6TypeA => "ISO/IEC 13818-6 Type A",
316            Self::Iso13818_6TypeB => "ISO/IEC 13818-6 Type B",
317            Self::Iso13818_6TypeC => "ISO/IEC 13818-6 Type C",
318            Self::Iso13818_6TypeD => "ISO/IEC 13818-6 Type D",
319            Self::Auxiliary => "Auxiliary",
320            Self::AacAdts => "AAC ADTS",
321            Self::Mpeg4Video => "MPEG-4 Video",
322            Self::AacLatm => "AAC LATM",
323            Self::SlFlexMuxPes => "SL/FlexMux in PES",
324            Self::SlFlexMuxSections => "SL/FlexMux in Sections",
325            Self::SyncDownload => "Sync Download Protocol",
326            Self::MetadataPes => "Metadata in PES",
327            Self::MetadataSections => "Metadata in Sections",
328            Self::MetadataDataCarousel => "Metadata Data Carousel",
329            Self::MetadataObjectCarousel => "Metadata Object Carousel",
330            Self::MetadataSyncDownload => "Metadata Sync Download",
331            Self::Ipmp => "IPMP",
332            Self::H264 => "H.264/AVC",
333            Self::Iso14496_3Audio => "ISO/IEC 14496-3 Audio",
334            Self::Iso14496_17Text => "ISO/IEC 14496-17 Text",
335            Self::AuxiliaryVideo => "Auxiliary Video",
336            Self::Svc => "SVC",
337            Self::Mvc => "MVC",
338            Self::Jpeg2000 => "JPEG 2000",
339            Self::AdditionalViewH262 => "Additional View H.262 (3D)",
340            Self::AdditionalViewH264 => "Additional View H.264 (3D)",
341            Self::Hevc => "HEVC/H.265",
342            Self::HevcTemporalSubset => "HEVC Temporal Subset",
343            Self::Mvcd => "MVCD (H.264 Annex I)",
344            Self::Temi => "TEMI",
345            Self::HevcAnnexG => "HEVC Annex G",
346            Self::HevcAnnexGTemporal => "HEVC Annex G Temporal",
347            Self::HevcAnnexH => "HEVC Annex H",
348            Self::HevcAnnexHTemporal => "HEVC Annex H Temporal",
349            Self::GreenAccessUnits => "Green Access Units",
350            Self::MhasAudioMain => "MHAS Audio Main",
351            Self::MhasAudioAux => "MHAS Audio Aux",
352            Self::QualityAccessUnits => "Quality Access Units",
353            Self::MediaOrchestration => "Media Orchestration",
354            Self::MctsHevc => "MCTS HEVC",
355            Self::JpegXs => "JPEG XS",
356            Self::Vvc => "VVC/H.266",
357            Self::VvcTemporalSubset => "VVC Temporal Subset",
358            Self::Evc => "EVC",
359            Self::IpmpHigh => "IPMP (0x7F)",
360            Self::Ac3 => "AC-3",
361            Self::Scte35 => "SCTE-35",
362            Self::EAc3 => "E-AC-3",
363            Self::ReservedRange(_) => "Reserved",
364            Self::UserPrivate(_) => "User Private",
365        }
366    }
367}
368dvb_common::impl_spec_display!(StreamType, ReservedRange, UserPrivate);
369
370/// One elementary stream entry in the PMT's ES loop.
371#[derive(Debug, Clone, PartialEq, Eq)]
372#[cfg_attr(feature = "serde", derive(serde::Serialize))]
373#[cfg_attr(feature = "yoke", derive(yoke::Yokeable))]
374pub struct PmtStream<'a> {
375    /// MPEG-2 stream_type byte (ISO/IEC 13818-1 Table 2-34).
376    pub stream_type: StreamType,
377    /// 13-bit elementary stream PID.
378    pub elementary_pid: u16,
379    /// Raw ES_info descriptor bytes; parsing lives in crate::descriptors.
380    /// Elementary-stream descriptor loop. Serializes as the typed descriptor
381    /// sequence; `.raw()` yields the wire bytes.
382    pub es_info: DescriptorLoop<'a>,
383}
384
385/// Program Map Table.
386#[non_exhaustive]
387#[derive(Debug, Clone, PartialEq, Eq)]
388#[cfg_attr(feature = "serde", derive(serde::Serialize))]
389#[cfg_attr(feature = "yoke", derive(yoke::Yokeable))]
390pub struct PmtSection<'a> {
391    /// Programme number from the table_id_extension field.
392    pub program_number: u16,
393    /// 5-bit version_number.
394    pub version_number: u8,
395    /// current_next_indicator bit.
396    pub current_next_indicator: bool,
397    /// section_number in the sub-table sequence (ISO/IEC 13818-1 §2.4.4.8;
398    /// shall be 0x00 for conformant PMTs but preserved for round-trip fidelity).
399    pub section_number: u8,
400    /// last_section_number in the sub-table sequence (ISO/IEC 13818-1 §2.4.4.8;
401    /// shall be 0x00 for conformant PMTs but preserved for round-trip fidelity).
402    pub last_section_number: u8,
403    /// 13-bit PCR PID.
404    pub pcr_pid: u16,
405    /// Raw program_info descriptor bytes.
406    /// Program-info descriptor loop. Serializes as the typed descriptor
407    /// sequence; `.raw()` yields the wire bytes.
408    pub program_info: DescriptorLoop<'a>,
409    /// Elementary streams in wire order.
410    pub streams: Vec<PmtStream<'a>>,
411}
412
413impl<'a> PmtSection<'a> {
414    /// Construct a `PmtSection` from its fields.
415    ///
416    /// This is the canonical constructor for external code. `PmtSection` is
417    /// `#[non_exhaustive]` so struct literal syntax is not available outside
418    /// the crate; use this function instead.
419    #[must_use]
420    #[allow(clippy::too_many_arguments)]
421    pub fn new(
422        program_number: u16,
423        version_number: u8,
424        current_next_indicator: bool,
425        section_number: u8,
426        last_section_number: u8,
427        pcr_pid: u16,
428        program_info: DescriptorLoop<'a>,
429        streams: Vec<PmtStream<'a>>,
430    ) -> Self {
431        Self {
432            program_number,
433            version_number,
434            current_next_indicator,
435            section_number,
436            last_section_number,
437            pcr_pid,
438            program_info,
439            streams,
440        }
441    }
442}
443
444impl<'a> Parse<'a> for PmtSection<'a> {
445    type Error = crate::error::Error;
446    fn parse(bytes: &'a [u8]) -> Result<Self> {
447        let min_len =
448            MIN_HEADER_LEN + EXTENSION_HEADER_LEN + PCR_PID_LEN + PROG_INFO_LEN_BYTES + CRC_LEN;
449        if bytes.len() < min_len {
450            return Err(Error::BufferTooShort {
451                need: min_len,
452                have: bytes.len(),
453                what: "PmtSection",
454            });
455        }
456        if bytes[0] != TABLE_ID {
457            return Err(Error::UnexpectedTableId {
458                table_id: bytes[0],
459                what: "PmtSection",
460                expected: &[TABLE_ID],
461            });
462        }
463
464        let section_length = ((bytes[1] & 0x0F) as u16) << 8 | bytes[2] as u16;
465        let total = super::check_section_length(
466            bytes.len(),
467            MIN_HEADER_LEN,
468            section_length as usize,
469            MIN_SECTION_LEN,
470        )?;
471
472        let program_number = u16::from_be_bytes([bytes[3], bytes[4]]);
473        let version_number = (bytes[5] >> 1) & 0x1F;
474        let current_next_indicator = (bytes[5] & 0x01) != 0;
475        let section_number = bytes[6];
476        let last_section_number = bytes[7];
477
478        let pcr_pid = (((bytes[8] & 0x1F) as u16) << 8) | bytes[9] as u16;
479        let program_info_length = (((bytes[10] & 0x0F) as usize) << 8) | bytes[11] as usize;
480
481        let prog_info_start =
482            MIN_HEADER_LEN + EXTENSION_HEADER_LEN + PCR_PID_LEN + PROG_INFO_LEN_BYTES;
483        let prog_info_end = prog_info_start + program_info_length;
484        let stream_loop_end = total - CRC_LEN;
485        if prog_info_end > stream_loop_end {
486            return Err(Error::SectionLengthOverflow {
487                declared: program_info_length,
488                available: stream_loop_end.saturating_sub(prog_info_start),
489            });
490        }
491        let program_info = DescriptorLoop::new(&bytes[prog_info_start..prog_info_end]);
492
493        let mut streams = Vec::new();
494        let mut pos = prog_info_end;
495        while pos + STREAM_HEADER_LEN <= stream_loop_end {
496            let stream_type = StreamType::from_u8(bytes[pos]);
497            let elementary_pid = (((bytes[pos + 1] & 0x1F) as u16) << 8) | bytes[pos + 2] as u16;
498            let es_info_length =
499                (((bytes[pos + 3] & 0x0F) as usize) << 8) | bytes[pos + 4] as usize;
500            let es_start = pos + STREAM_HEADER_LEN;
501            let es_end = es_start + es_info_length;
502            if es_end > stream_loop_end {
503                return Err(Error::SectionLengthOverflow {
504                    declared: es_info_length,
505                    available: stream_loop_end.saturating_sub(es_start),
506                });
507            }
508            streams.push(PmtStream {
509                stream_type,
510                elementary_pid,
511                es_info: DescriptorLoop::new(&bytes[es_start..es_end]),
512            });
513            pos = es_end;
514        }
515
516        Ok(PmtSection {
517            program_number,
518            version_number,
519            current_next_indicator,
520            section_number,
521            last_section_number,
522            pcr_pid,
523            program_info,
524            streams,
525        })
526    }
527}
528
529impl Serialize for PmtSection<'_> {
530    type Error = crate::error::Error;
531    fn serialized_len(&self) -> usize {
532        let streams_bytes: usize = self
533            .streams
534            .iter()
535            .map(|s| STREAM_HEADER_LEN + s.es_info.len())
536            .sum();
537        MIN_HEADER_LEN
538            + EXTENSION_HEADER_LEN
539            + PCR_PID_LEN
540            + PROG_INFO_LEN_BYTES
541            + self.program_info.len()
542            + streams_bytes
543            + CRC_LEN
544    }
545
546    fn serialize_into(&self, buf: &mut [u8]) -> Result<usize> {
547        let len = self.serialized_len();
548        if buf.len() < len {
549            return Err(Error::OutputBufferTooSmall {
550                need: len,
551                have: buf.len(),
552            });
553        }
554
555        let section_length: u16 = (len - MIN_HEADER_LEN) as u16;
556        buf[0] = TABLE_ID;
557        buf[1] = super::SECTION_B1_FLAGS_PSI | ((section_length >> 8) as u8 & 0x0F);
558        buf[2] = (section_length & 0xFF) as u8;
559        buf[3..5].copy_from_slice(&self.program_number.to_be_bytes());
560        buf[5] = 0xC0 | ((self.version_number & 0x1F) << 1) | u8::from(self.current_next_indicator);
561        buf[6] = self.section_number;
562        buf[7] = self.last_section_number;
563        buf[8] = 0xE0 | ((self.pcr_pid >> 8) as u8 & 0x1F);
564        buf[9] = (self.pcr_pid & 0xFF) as u8;
565        let pil = self.program_info.len() as u16;
566        buf[10] = 0xF0 | ((pil >> 8) as u8 & 0x0F);
567        buf[11] = (pil & 0xFF) as u8;
568
569        let prog_info_start =
570            MIN_HEADER_LEN + EXTENSION_HEADER_LEN + PCR_PID_LEN + PROG_INFO_LEN_BYTES;
571        buf[prog_info_start..prog_info_start + self.program_info.len()]
572            .copy_from_slice(self.program_info.raw());
573
574        let mut pos = prog_info_start + self.program_info.len();
575        for stream in &self.streams {
576            buf[pos] = stream.stream_type.to_u8();
577            buf[pos + 1] = 0xE0 | ((stream.elementary_pid >> 8) as u8 & 0x1F);
578            buf[pos + 2] = (stream.elementary_pid & 0xFF) as u8;
579            let esl = stream.es_info.len() as u16;
580            buf[pos + 3] = 0xF0 | ((esl >> 8) as u8 & 0x0F);
581            buf[pos + 4] = (esl & 0xFF) as u8;
582            let es_start = pos + STREAM_HEADER_LEN;
583            buf[es_start..es_start + stream.es_info.len()].copy_from_slice(stream.es_info.raw());
584            pos = es_start + stream.es_info.len();
585        }
586
587        let crc_pos = len - CRC_LEN;
588        let crc = dvb_common::crc32_mpeg2::compute(&buf[..crc_pos]);
589        buf[crc_pos..len].copy_from_slice(&crc.to_be_bytes());
590        Ok(len)
591    }
592}
593impl<'a> crate::traits::TableDef<'a> for PmtSection<'a> {
594    const TABLE_ID_RANGES: &'static [(u8, u8)] = &[(TABLE_ID, TABLE_ID)];
595    const NAME: &'static str = "PROGRAM_MAP";
596}
597
598#[cfg(test)]
599mod tests {
600    use super::*;
601
602    /// Build a PMT section with given fields. Placeholder CRC.
603    fn build_pmt(
604        program_number: u16,
605        version: u8,
606        pcr_pid: u16,
607        program_info: &[u8],
608        streams: &[(u8, u16, Vec<u8>)],
609    ) -> Vec<u8> {
610        let streams_bytes: usize = streams
611            .iter()
612            .map(|(_, _, es)| STREAM_HEADER_LEN + es.len())
613            .sum();
614        let section_length: u16 = (EXTENSION_HEADER_LEN
615            + PCR_PID_LEN
616            + PROG_INFO_LEN_BYTES
617            + program_info.len()
618            + streams_bytes
619            + CRC_LEN) as u16;
620        let mut v = Vec::new();
621        v.push(TABLE_ID);
622        v.push(super::super::SECTION_B1_FLAGS_PSI | ((section_length >> 8) as u8 & 0x0F));
623        v.push((section_length & 0xFF) as u8);
624        v.extend_from_slice(&program_number.to_be_bytes());
625        v.push(0xC0 | ((version & 0x1F) << 1) | 0x01);
626        v.push(0);
627        v.push(0);
628        v.push(0xE0 | ((pcr_pid >> 8) as u8 & 0x1F));
629        v.push((pcr_pid & 0xFF) as u8);
630        v.push(0xF0 | ((program_info.len() >> 8) as u8 & 0x0F));
631        v.push((program_info.len() & 0xFF) as u8);
632        v.extend_from_slice(program_info);
633        for (stype, pid, es) in streams {
634            v.push(*stype);
635            v.push(0xE0 | ((pid >> 8) as u8 & 0x1F));
636            v.push((pid & 0xFF) as u8);
637            v.push(0xF0 | ((es.len() >> 8) as u8 & 0x0F));
638            v.push((es.len() & 0xFF) as u8);
639            v.extend_from_slice(es);
640        }
641        v.extend_from_slice(&[0, 0, 0, 0]);
642        v
643    }
644
645    #[test]
646    fn parse_extracts_pcr_pid_and_program_info() {
647        let bytes = build_pmt(42, 5, 0x0100, &[0xAA, 0xBB], &[]);
648        let pmt = PmtSection::parse(&bytes).unwrap();
649        assert_eq!(pmt.program_number, 42);
650        assert_eq!(pmt.version_number, 5);
651        assert!(pmt.current_next_indicator);
652        assert_eq!(pmt.pcr_pid, 0x0100);
653        assert_eq!(pmt.program_info.raw(), &[0xAA, 0xBB]);
654        assert_eq!(pmt.streams.len(), 0);
655    }
656
657    #[test]
658    fn parse_elementary_streams_and_es_info_slices() {
659        let bytes = build_pmt(
660            1,
661            0,
662            0x101,
663            &[],
664            &[(0x02, 0x102, vec![0x11, 0x22]), (0x1B, 0x103, vec![0x33])],
665        );
666        let pmt = PmtSection::parse(&bytes).unwrap();
667        assert_eq!(pmt.streams.len(), 2);
668        assert_eq!(pmt.streams[0].stream_type, StreamType::Mpeg2Video);
669        assert_eq!(pmt.streams[0].elementary_pid, 0x102);
670        assert_eq!(pmt.streams[0].es_info.raw(), &[0x11, 0x22]);
671        assert_eq!(pmt.streams[1].stream_type, StreamType::H264);
672        assert_eq!(pmt.streams[1].elementary_pid, 0x103);
673        assert_eq!(pmt.streams[1].es_info.raw(), &[0x33]);
674    }
675
676    #[test]
677    fn parse_rejects_wrong_table_id() {
678        let mut bytes = build_pmt(1, 0, 0x100, &[], &[]);
679        bytes[0] = 0x00;
680        let err = PmtSection::parse(&bytes).unwrap_err();
681        assert!(matches!(
682            err,
683            Error::UnexpectedTableId { table_id: 0x00, .. }
684        ));
685    }
686
687    #[test]
688    fn parse_rejects_short_buffer() {
689        let err = PmtSection::parse(&[0x02, 0x00]).unwrap_err();
690        assert!(matches!(err, Error::BufferTooShort { .. }));
691    }
692
693    #[test]
694    fn serialize_round_trip_empty_program() {
695        let pmt = PmtSection {
696            program_number: 1,
697            version_number: 0,
698            current_next_indicator: true,
699            section_number: 0,
700            last_section_number: 0,
701            pcr_pid: 0x100,
702            program_info: DescriptorLoop::new(&[]),
703            streams: vec![],
704        };
705        let mut buf = vec![0u8; pmt.serialized_len()];
706        pmt.serialize_into(&mut buf).unwrap();
707        let re = PmtSection::parse(&buf).unwrap();
708        assert_eq!(pmt, re);
709    }
710
711    #[test]
712    fn serialize_round_trip_with_streams_and_descriptors() {
713        let prog_info: [u8; 3] = [0x09, 0x01, 0xFF];
714        let es1: [u8; 4] = [0x52, 0x02, 0xAA, 0xBB];
715        let es2: [u8; 2] = [0x0A, 0x00];
716        let pmt = PmtSection {
717            program_number: 0xABCD,
718            version_number: 7,
719            current_next_indicator: true,
720            section_number: 0,
721            last_section_number: 0,
722            pcr_pid: 0x1F0,
723            program_info: DescriptorLoop::new(&prog_info),
724            streams: vec![
725                PmtStream {
726                    stream_type: StreamType::Mpeg2Video,
727                    elementary_pid: 0x100,
728                    es_info: DescriptorLoop::new(&es1),
729                },
730                PmtStream {
731                    stream_type: StreamType::Mpeg1Audio,
732                    elementary_pid: 0x101,
733                    es_info: DescriptorLoop::new(&es2),
734                },
735                PmtStream {
736                    stream_type: StreamType::H264,
737                    elementary_pid: 0x102,
738                    es_info: DescriptorLoop::new(&[]),
739                },
740            ],
741        };
742        let mut buf = vec![0u8; pmt.serialized_len()];
743        pmt.serialize_into(&mut buf).unwrap();
744        let re = PmtSection::parse(&buf).unwrap();
745        assert_eq!(pmt, re);
746    }
747
748    #[test]
749    fn zero_elementary_streams_is_valid() {
750        let bytes = build_pmt(99, 0, 0x0100, &[], &[]);
751        let pmt = PmtSection::parse(&bytes).unwrap();
752        assert_eq!(pmt.streams.len(), 0);
753    }
754
755    #[test]
756    fn parse_preserves_raw_program_info_bytes() {
757        let pi = vec![0x09, 0x04, 0x01, 0x02, 0x03, 0x04];
758        let bytes = build_pmt(1, 0, 0x100, &pi, &[]);
759        let pmt = PmtSection::parse(&bytes).unwrap();
760        assert_eq!(pmt.program_info.raw(), &pi[..]);
761    }
762
763    #[test]
764    fn parse_rejects_zero_section_length() {
765        let mut buf = vec![0u8; 64];
766        buf[0] = TABLE_ID;
767        buf[1] = 0xF0;
768        buf[2] = 0x00;
769        for b in &mut buf[3..] {
770            *b = 0xFF;
771        }
772        assert!(matches!(
773            PmtSection::parse(&buf).unwrap_err(),
774            Error::SectionLengthOverflow { .. }
775        ));
776    }
777
778    #[test]
779    fn stream_type_full_range_round_trip() {
780        for byte in 0u8..=0xFF {
781            let st = StreamType::from_u8(byte);
782            assert_eq!(
783                st.to_u8(),
784                byte,
785                "StreamType round-trip failed for {byte:#04x}"
786            );
787        }
788    }
789
790    #[test]
791    fn stream_type_named_values() {
792        assert_eq!(StreamType::Mpeg2Video.to_u8(), 0x02);
793        assert_eq!(StreamType::H264.to_u8(), 0x1B);
794        assert_eq!(StreamType::Hevc.to_u8(), 0x24);
795        assert_eq!(StreamType::Vvc.to_u8(), 0x33);
796        assert_eq!(StreamType::MediaOrchestration.to_u8(), 0x30);
797        assert_eq!(StreamType::Mvcd.to_u8(), 0x26);
798        assert_eq!(StreamType::Temi.to_u8(), 0x27);
799        assert_eq!(StreamType::Ac3.to_u8(), 0x81);
800        assert_eq!(StreamType::Scte35.to_u8(), 0x86);
801        assert_eq!(StreamType::EAc3.to_u8(), 0x87);
802        assert_eq!(StreamType::AacAdts.to_u8(), 0x0F);
803        assert_eq!(StreamType::IpmpHigh.to_u8(), 0x7F);
804    }
805
806    #[test]
807    fn stream_type_names() {
808        assert_eq!(StreamType::Mpeg2Video.name(), "MPEG-2 Video");
809        assert_eq!(StreamType::H264.name(), "H.264/AVC");
810        assert_eq!(StreamType::Hevc.name(), "HEVC/H.265");
811        assert_eq!(StreamType::Vvc.name(), "VVC/H.266");
812        assert_eq!(StreamType::MediaOrchestration.name(), "Media Orchestration");
813        assert_eq!(StreamType::Mvcd.name(), "MVCD (H.264 Annex I)");
814        assert_eq!(StreamType::Temi.name(), "TEMI");
815        assert_eq!(StreamType::DsmCc.name(), "DSM-CC");
816        assert_eq!(StreamType::Ac3.name(), "AC-3");
817        assert_eq!(StreamType::Scte35.name(), "SCTE-35");
818    }
819
820    #[test]
821    fn stream_type_wire_to_name() {
822        assert_eq!(StreamType::from_u8(0x02).name(), "MPEG-2 Video");
823        assert_eq!(StreamType::from_u8(0x1B).name(), "H.264/AVC");
824        assert_eq!(StreamType::from_u8(0x24).name(), "HEVC/H.265");
825        assert_eq!(StreamType::from_u8(0x00).name(), "Reserved");
826        assert_eq!(StreamType::from_u8(0x81).name(), "AC-3");
827    }
828
829    /// Regression test for #181: non-zero section_number/last_section_number must
830    /// survive a serialize → parse round-trip. Before the fix, serialize_into
831    /// hardcoded buf[6]=0 and buf[7]=0, so this test would fail.
832    #[test]
833    fn section_number_round_trip_nonzero() {
834        let pmt = PmtSection {
835            program_number: 42,
836            version_number: 1,
837            current_next_indicator: true,
838            section_number: 3,
839            last_section_number: 7,
840            pcr_pid: 0x0200,
841            program_info: DescriptorLoop::new(&[]),
842            streams: vec![],
843        };
844        let mut buf = vec![0u8; pmt.serialized_len()];
845        pmt.serialize_into(&mut buf).unwrap();
846        // Wire bytes[6] and [7] must carry the encoded values.
847        assert_eq!(buf[6], 3, "wire byte[6] must be section_number=3");
848        assert_eq!(buf[7], 7, "wire byte[7] must be last_section_number=7");
849        // Re-parse must recover the same values.
850        let re = PmtSection::parse(&buf).unwrap();
851        assert_eq!(re.section_number, 3);
852        assert_eq!(re.last_section_number, 7);
853        assert_eq!(pmt, re);
854    }
855}
dvb_si/tables/pmt.rs

dvb_si/tables/
pmt.rs
