mirror of
https://github.com/alfg/mp4-rust.git
synced 2024-06-11 09:29:21 +00:00
0df82aec5f
* Add ReadBox trait * Add boxtype macro * Remove offset in BoxHeader * Fix parsing error when box has largesize * Remove duplicated codes reading version and flags * Add avc1 box * Add mp4a box * Add mp4a box * Add DecoderSpecificDescriptor in esds box * Add necessary sub-boxes to stbl box * Improve ReadBox::read_box() * Add smhd box * Refactor BoxHeader * Refactor BMFF * Refactor * Add some functions to get offset and size of sample * Add Mp4Reader::read_sample() that read media samples Co-authored-by: Byungwan Jun <unipro.kr@gmail.com>
412 lines
9.8 KiB
Rust
412 lines
9.8 KiB
Rust
use std::io::{Seek, Read, Write};
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use byteorder::{BigEndian, ReadBytesExt, WriteBytesExt};
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use crate::*;
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use crate::atoms::*;
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#[derive(Debug, PartialEq)]
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pub struct Mp4aBox {
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pub data_reference_index: u16,
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pub channel_count: u16,
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pub samplesize: u16,
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pub samplerate: u32,
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pub esds: EsdsBox,
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}
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impl Default for Mp4aBox {
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fn default() -> Self {
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Mp4aBox {
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data_reference_index: 0,
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channel_count: 2,
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samplesize: 16,
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samplerate: 0, // XXX
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esds: EsdsBox::default(),
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}
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}
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}
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impl Mp4Box for Mp4aBox {
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fn box_type() -> BoxType {
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BoxType::Mp4aBox
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}
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fn box_size(&self) -> u64 {
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HEADER_SIZE + 8 + 74 + self.esds.box_size()
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}
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}
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impl<R: Read + Seek> ReadBox<&mut R> for Mp4aBox {
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fn read_box(reader: &mut R, size: u64) -> Result<Self> {
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let start = get_box_start(reader)?;
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reader.read_u32::<BigEndian>()?; // reserved
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reader.read_u16::<BigEndian>()?; // reserved
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let data_reference_index = reader.read_u16::<BigEndian>()?;
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reader.read_u64::<BigEndian>()?; // reserved
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let channel_count = reader.read_u16::<BigEndian>()?;
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let samplesize = reader.read_u16::<BigEndian>()?;
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reader.read_u32::<BigEndian>()?; // pre-defined, reserved
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let samplerate = reader.read_u32::<BigEndian>()?;
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let header = BoxHeader::read(reader)?;
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let BoxHeader{ name, size: s } = header;
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if name == BoxType::EsdsBox {
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let esds = EsdsBox::read_box(reader, s)?;
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skip_read_to(reader, start + size)?;
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Ok(Mp4aBox {
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data_reference_index,
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channel_count,
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samplesize,
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samplerate,
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esds,
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})
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} else {
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Err(Error::InvalidData("esds not found"))
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}
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}
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}
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impl<W: Write> WriteBox<&mut W> for Mp4aBox {
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fn write_box(&self, writer: &mut W) -> Result<u64> {
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let size = self.box_size();
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BoxHeader::new(Self::box_type(), size).write(writer)?;
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writer.write_u32::<BigEndian>(0)?; // reserved
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writer.write_u16::<BigEndian>(0)?; // reserved
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writer.write_u16::<BigEndian>(self.data_reference_index)?;
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writer.write_u64::<BigEndian>(0)?; // reserved
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writer.write_u16::<BigEndian>(self.channel_count)?;
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writer.write_u16::<BigEndian>(self.samplesize)?;
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writer.write_u32::<BigEndian>(0)?; // reserved
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writer.write_u32::<BigEndian>(self.samplerate)?;
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self.esds.write_box(writer)?;
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Ok(size)
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}
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}
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#[derive(Debug, Default, PartialEq)]
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pub struct EsdsBox {
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pub version: u8,
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pub flags: u32,
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pub es_desc: ESDescriptor,
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}
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impl Mp4Box for EsdsBox {
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fn box_type() -> BoxType {
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BoxType::EsdsBox
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}
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fn box_size(&self) -> u64 {
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HEADER_SIZE + HEADER_EXT_SIZE
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}
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}
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impl<R: Read + Seek> ReadBox<&mut R> for EsdsBox {
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fn read_box(reader: &mut R, size: u64) -> Result<Self> {
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let start = get_box_start(reader)?;
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let (version, flags) = read_box_header_ext(reader)?;
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let es_desc = ESDescriptor::read_desc(reader)?;
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skip_read_to(reader, start + size)?;
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Ok(EsdsBox {
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version,
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flags,
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es_desc,
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})
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}
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}
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impl<W: Write> WriteBox<&mut W> for EsdsBox {
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fn write_box(&self, writer: &mut W) -> Result<u64> {
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let size = self.box_size();
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BoxHeader::new(Self::box_type(), size).write(writer)?;
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write_box_header_ext(writer, self.version, self.flags)?;
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Ok(size)
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}
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}
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trait Descriptor: Sized {
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fn desc_tag() -> u8;
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fn desc_size() -> u32;
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}
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trait ReadDesc<T>: Sized {
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fn read_desc(_: T) -> Result<Self>;
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}
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trait WriteDesc<T>: Sized {
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fn write_desc(&self, _: T) -> Result<u32>;
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}
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fn read_desc<R: Read>(reader: &mut R) -> Result<(u8, u32)> {
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let tag = reader.read_u8()?;
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let mut size: u32 = 0;
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for _ in 0..4 {
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let b = reader.read_u8()?;
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size = (size << 7) | (b & 0x7F) as u32;
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if b & 0x80 == 0 {
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break;
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}
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}
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Ok((tag, size))
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}
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fn write_desc<W: Write>(writer: &mut W, tag: u8, size: u32) -> Result<u64> {
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writer.write_u8(tag)?;
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if size > 0x0FFFFFFF {
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return Err(Error::InvalidData("invalid descriptor length range"));
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}
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let nbytes = match size {
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0x0..=0x7F => 1,
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0x80..=0x3FFF => 2,
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0x4000..=0x1FFFFF => 3,
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_ => 4,
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};
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for i in 0..nbytes {
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let mut b = (size >> ((3 - i) * 7)) as u8 & 0x7F;
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if i < nbytes - 1 {
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b |= 0x80;
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}
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writer.write_u8(b)?;
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}
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Ok(1 + nbytes)
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}
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#[derive(Debug, Default, PartialEq)]
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pub struct ESDescriptor {
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pub tag: u8,
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pub size: u32,
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pub es_id: u16,
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pub dec_config: DecoderConfigDescriptor,
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pub sl_config: SLConfigDescriptor,
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}
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impl Descriptor for ESDescriptor {
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fn desc_tag() -> u8 {
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0x03
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}
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// XXX size > 0x7F
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fn desc_size() -> u32 {
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2 + 3
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+ DecoderConfigDescriptor::desc_size()
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+ SLConfigDescriptor::desc_size()
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}
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}
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impl<R: Read + Seek> ReadDesc<&mut R> for ESDescriptor {
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fn read_desc(reader: &mut R) -> Result<Self> {
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let (tag, size) = read_desc(reader)?;
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if tag != Self::desc_tag() {
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return Err(Error::InvalidData("ESDescriptor not found"));
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}
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let es_id = reader.read_u16::<BigEndian>()?;
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reader.read_u8()?; // XXX flags must be 0
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let dec_config = DecoderConfigDescriptor::read_desc(reader)?;
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let sl_config = SLConfigDescriptor::read_desc(reader)?;
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Ok(ESDescriptor {
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tag,
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size,
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es_id,
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dec_config,
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sl_config,
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})
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}
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}
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impl<W: Write> WriteDesc<&mut W> for ESDescriptor {
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fn write_desc(&self, writer: &mut W) -> Result<u32> {
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write_desc(writer, self.tag, self.size)?;
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Ok(self.size)
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}
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}
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#[derive(Debug, Default, PartialEq)]
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pub struct DecoderConfigDescriptor {
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pub tag: u8,
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pub size: u32,
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pub object_type_indication: u8,
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pub stream_type: u8,
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pub up_stream: u8,
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pub buffer_size_db: u32,
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pub max_bitrate: u32,
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pub avg_bitrate: u32,
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pub dec_specific: DecoderSpecificDescriptor,
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}
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impl Descriptor for DecoderConfigDescriptor {
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fn desc_tag() -> u8 {
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0x04
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}
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// XXX size > 0x7F
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fn desc_size() -> u32 {
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2 + 13 + DecoderSpecificDescriptor::desc_size()
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}
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}
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impl<R: Read + Seek> ReadDesc<&mut R> for DecoderConfigDescriptor {
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fn read_desc(reader: &mut R) -> Result<Self> {
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let (tag, size) = read_desc(reader)?;
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if tag != Self::desc_tag() {
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return Err(Error::InvalidData("DecoderConfigDescriptor not found"));
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}
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let object_type_indication = reader.read_u8()?;
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let byte_a = reader.read_u8()?;
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let stream_type = byte_a & 0xFC;
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let up_stream = byte_a & 0x02;
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let buffer_size_db = reader.read_u24::<BigEndian>()?;
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let max_bitrate = reader.read_u32::<BigEndian>()?;
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let avg_bitrate = reader.read_u32::<BigEndian>()?;
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let dec_specific = DecoderSpecificDescriptor::read_desc(reader)?;
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// XXX skip_read
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for _ in DecoderConfigDescriptor::desc_size()..size-1 {
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reader.read_u8()?;
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}
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Ok(DecoderConfigDescriptor {
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tag,
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size,
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object_type_indication,
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stream_type,
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up_stream,
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buffer_size_db,
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max_bitrate,
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avg_bitrate,
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dec_specific,
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})
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}
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}
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impl<W: Write> WriteDesc<&mut W> for DecoderConfigDescriptor {
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fn write_desc(&self, writer: &mut W) -> Result<u32> {
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write_desc(writer, self.tag, self.size)?;
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Ok(self.size)
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}
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}
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#[derive(Debug, Default, PartialEq)]
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pub struct DecoderSpecificDescriptor {
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pub tag: u8,
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pub size: u32,
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pub profile: u8,
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pub freq_index: u8,
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pub chan_conf: u8,
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}
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impl Descriptor for DecoderSpecificDescriptor {
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fn desc_tag() -> u8 {
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0x05
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}
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// XXX size > 0x7F
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fn desc_size() -> u32 {
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2 + 2
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}
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}
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impl<R: Read + Seek> ReadDesc<&mut R> for DecoderSpecificDescriptor {
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fn read_desc(reader: &mut R) -> Result<Self> {
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let (tag, size) = read_desc(reader)?;
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if tag != Self::desc_tag() {
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return Err(Error::InvalidData("DecoderSpecificDescriptor not found"));
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}
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let byte_a = reader.read_u8()?;
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let byte_b = reader.read_u8()?;
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let profile = byte_a >> 3;
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let freq_index = ((byte_a & 0x07) << 1) + (byte_b >> 7);
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let chan_conf = (byte_b >> 3) & 0x0F;
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Ok(DecoderSpecificDescriptor {
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tag,
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size,
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profile,
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freq_index,
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chan_conf,
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})
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}
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}
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impl<W: Write> WriteDesc<&mut W> for DecoderSpecificDescriptor {
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fn write_desc(&self, writer: &mut W) -> Result<u32> {
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write_desc(writer, self.tag, self.size)?;
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Ok(self.size)
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}
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}
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#[derive(Debug, Default, PartialEq)]
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pub struct SLConfigDescriptor {
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pub tag: u8,
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pub size: u32,
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}
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impl Descriptor for SLConfigDescriptor {
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fn desc_tag() -> u8 {
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0x06
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}
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// XXX size > 0x7F
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fn desc_size() -> u32 {
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2 + 1
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}
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}
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impl<R: Read + Seek> ReadDesc<&mut R> for SLConfigDescriptor {
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fn read_desc(reader: &mut R) -> Result<Self> {
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let (tag, size) = read_desc(reader)?;
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if tag != Self::desc_tag() {
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return Err(Error::InvalidData("SLConfigDescriptor not found"));
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}
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reader.read_u8()?; // pre-defined
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Ok(SLConfigDescriptor {
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tag,
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size,
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})
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}
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}
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impl<W: Write> WriteDesc<&mut W> for SLConfigDescriptor {
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fn write_desc(&self, writer: &mut W) -> Result<u32> {
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write_desc(writer, self.tag, self.size)?;
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Ok(self.size)
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}
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}
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