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https://github.com/alfg/mp4-rust.git
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6cd4f72d28
* Make ftyp and moov on Mp4Reader public. Also update README.md with working example. * update readme
134 lines
3.6 KiB
Rust
134 lines
3.6 KiB
Rust
use std::io::{Read, Seek, SeekFrom};
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use std::time::Duration;
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use crate::mp4box::*;
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use crate::*;
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#[derive(Debug)]
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pub struct Mp4Reader<R> {
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reader: R,
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pub ftyp: FtypBox,
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pub moov: MoovBox,
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tracks: Vec<Mp4Track>,
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size: u64,
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}
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impl<R: Read + Seek> Mp4Reader<R> {
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pub fn read_header(mut reader: R, size: u64) -> Result<Self> {
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let start = reader.seek(SeekFrom::Current(0))?;
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let mut ftyp = None;
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let mut moov = None;
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let mut current = start;
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while current < size {
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// Get box header.
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let header = BoxHeader::read(&mut reader)?;
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let BoxHeader { name, size: s } = header;
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// Match and parse the atom boxes.
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match name {
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BoxType::FtypBox => {
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ftyp = Some(FtypBox::read_box(&mut reader, s)?);
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}
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BoxType::FreeBox => {
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skip_box(&mut reader, s)?;
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}
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BoxType::MdatBox => {
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skip_box(&mut reader, s)?;
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}
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BoxType::MoovBox => {
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moov = Some(MoovBox::read_box(&mut reader, s)?);
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}
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BoxType::MoofBox => {
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skip_box(&mut reader, s)?;
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}
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_ => {
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// XXX warn!()
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skip_box(&mut reader, s)?;
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}
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}
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current = reader.seek(SeekFrom::Current(0))?;
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}
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if ftyp.is_none() {
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return Err(Error::BoxNotFound(BoxType::FtypBox));
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}
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if moov.is_none() {
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return Err(Error::BoxNotFound(BoxType::MoovBox));
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}
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let size = current - start;
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let tracks = if let Some(ref moov) = moov {
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let mut tracks = Vec::with_capacity(moov.traks.len());
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for (i, trak) in moov.traks.iter().enumerate() {
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assert_eq!(trak.tkhd.track_id, i as u32 + 1);
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tracks.push(Mp4Track::from(trak));
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}
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tracks
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} else {
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Vec::new()
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};
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Ok(Mp4Reader {
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reader,
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ftyp: ftyp.unwrap(),
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moov: moov.unwrap(),
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size,
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tracks,
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})
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}
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pub fn size(&self) -> u64 {
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self.size
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}
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pub fn major_brand(&self) -> &FourCC {
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&self.ftyp.major_brand
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}
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pub fn minor_version(&self) -> u32 {
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self.ftyp.minor_version
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}
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pub fn compatible_brands(&self) -> &[FourCC] {
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&self.ftyp.compatible_brands
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}
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pub fn duration(&self) -> Duration {
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Duration::from_millis(self.moov.mvhd.duration * 1000 / self.moov.mvhd.timescale as u64)
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}
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pub fn timescale(&self) -> u32 {
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self.moov.mvhd.timescale
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}
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pub fn tracks(&self) -> &[Mp4Track] {
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&self.tracks
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}
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pub fn sample_count(&self, track_id: u32) -> Result<u32> {
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if track_id == 0 {
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return Err(Error::TrakNotFound(track_id));
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}
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if let Some(track) = self.tracks.get(track_id as usize - 1) {
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Ok(track.sample_count())
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} else {
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Err(Error::TrakNotFound(track_id))
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}
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}
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pub fn read_sample(&mut self, track_id: u32, sample_id: u32) -> Result<Option<Mp4Sample>> {
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if track_id == 0 {
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return Err(Error::TrakNotFound(track_id));
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}
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if let Some(ref track) = self.tracks.get(track_id as usize - 1) {
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track.read_sample(&mut self.reader, sample_id)
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} else {
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Err(Error::TrakNotFound(track_id))
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}
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}
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}
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