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use super::{owned::*, AVResult};
use crate::ffi::*;
use std::fmt::Debug;
use std::path::Path;
#[derive(Copy, Clone, Default, Debug)]
pub struct FrameInfo {
pub codec_id: AVCodecID,
pub codec_type: AVMediaType,
}
pub struct FrameIter<'a> {
reader: &'a mut SimpleReader,
frame_infos: Vec<FrameInfo>,
}
impl<'a> Iterator for FrameIter<'a> {
type Item = (AVPacketOwned, FrameInfo);
fn next(&mut self) -> Option<Self::Item> {
if let Some(frame) = self.reader.read_frame() {
let stream_index = frame.stream_index as usize;
Some((frame, self.frame_infos[stream_index]))
} else {
None
}
}
}
impl<'a> FrameIter<'a> {
pub fn new(reader: &'a mut SimpleReader) -> Self {
let frame_infos: Vec<FrameInfo> = reader
.streams()
.iter()
.map(|stream| {
if let Some(codecpar) = stream.codecpar() {
FrameInfo {
codec_id: codecpar.codec_id,
codec_type: codecpar.codec_type,
}
} else {
FrameInfo::default()
}
})
.collect();
Self {
reader,
frame_infos,
}
}
}
/// Simple Reader for Demuxing Media Files.
#[derive(Debug)]
pub struct SimpleReader {
ctx: AVFormatContextOwned,
bsfs: Vec<AVBSFContextOwned>,
time_base: Option<AVRational>,
}
impl SimpleReader {
/// Create a new simple reader.
/// # Arguments
/// * `path` - Path of the input file.
/// * `format_options` - The options for demuxing format，like: movfragement.
/// * `time_unit` - Convert the pts, dts or duration to specified time unit,
// For example: convert to `us` unit: `time_unit=1000000`.
/// # Panics
///
pub fn open<P>(path: P, format_options: Option<&str>, time_unit: Option<i32>) -> AVResult<Self>
where
P: AsRef<Path> + Sized,
{
let ctx = AVFormatContextOwned::with_input(path, format_options)?;
let mut bsfs: Vec<AVBSFContextOwned> = vec![];
for stream in ctx.streams() {
if let Some(codecpar) = stream.codecpar() {
let filter_name = match codecpar.codec_tag {
AV_CODEC_TAG_AVC1 => "h264_mp4toannexb",
AV_CODEC_TAG_HEV1 | AV_CODEC_TAG_HVC1 => "hevc_mp4toannexb",
_ => "null",
};
let mut bsf = AVBSFContextOwned::new(filter_name)?;
bsf.prepare(Some(codecpar))?;
bsfs.push(bsf);
}
}
Ok(Self {
ctx,
bsfs,
time_base: time_unit.map(|x| AVRational::new(1, x)),
})
}
/// Returns the total stream bitrate in bit/s, 0 if not available.
pub fn bit_rate(&self) -> i64 {
self.ctx.bit_rate
}
/// Returns the duration of the stream.
pub fn duration(&self) -> i64 {
self.ctx.duration
}
/// Returns a list to describe the frame for each stream.
pub fn frame_infos(&self) -> Vec<FrameInfo> {
self.streams()
.iter()
.map(|stream| {
if let Some(codecpar) = stream.codecpar() {
FrameInfo {
codec_id: codecpar.codec_id,
codec_type: codecpar.codec_type,
}
} else {
FrameInfo::default()
}
})
.collect()
}
// Returns an iterator over the frames.
pub fn frames(&mut self) -> FrameIter<'_> {
FrameIter::new(self)
}
/// Return the next frame of a stream.
pub fn read_frame(&mut self) -> Option<AVPacketOwned> {
'outer: loop {
// Fetch frames from bitstream filter first.
for bsf in self.bsfs.iter_mut() {
match bsf.receive_packet() {
Ok(packet) => {
return Some(packet);
}
Err(err) => match err {
AVBSFError::Again => {}
AVBSFError::Reason(_) => {}
},
}
}
// Read frame from I/O context.
if let Some(mut packet) = self.ctx.read_frame() {
let stream_index = packet.stream_index as usize;
// Convert pts, dts, duratin to user specified.
if let (Some(out_time_base), Some(stream)) =
(self.time_base, self.ctx.streams().get(stream_index))
{
let in_time_base = stream.time_base;
let pts = unsafe {
av_rescale_q_rnd(
packet.pts,
in_time_base,
out_time_base,
AVRounding::new().near_inf().pass_min_max(),
)
};
let dts = unsafe {
av_rescale_q_rnd(
packet.dts,
in_time_base,
out_time_base,
AVRounding::new().near_inf().pass_min_max(),
)
};
let duration =
unsafe { av_rescale_q(packet.duration, in_time_base, out_time_base) };
packet.pts = pts;
packet.dts = dts;
packet.duration = duration;
}
// Send to bitstream filter.
if self.bsfs[stream_index].send_packet(&mut packet).is_err() {
break 'outer;
}
} else {
break 'outer;
}
}
None
}
/// Returns the position of the first frame of the component.
pub fn start_time(&self) -> i64 {
self.ctx.start_time
}
/// Returns then stream at index of the file.
pub fn stream(&self, index: usize) -> Option<&AVStream> {
self.streams().get(index).copied()
}
/// Returns a list of all streams in the file.
pub fn streams(&self) -> &[&AVStream] {
self.ctx.streams()
}
}