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gst-plugins-rs/gst-plugin-flv/src/flvdemux.rs
Sebastian Dröge 93f09c8a4a Add support for Speex to FLV demuxer 
... and arrays of values in caps while at the same time refactoring the
Value code a bit.
2017-01-13 19:04:51 +02:00

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// Copyright (C) 2016 Sebastian Dröge <sebastian@centricular.com>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the
// Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
// Boston, MA 02110-1301, USA.
use std::cmp;
use std::io::{Write, Cursor};
use nom;
use nom::IResult;
use flavors::parser as flavors;
use gst_plugin::error::*;
use gst_plugin::demuxer::*;
use gst_plugin::buffer::*;
use gst_plugin::adapter::*;
use gst_plugin::utils;
use gst_plugin::utils::Element;
use gst_plugin::log::*;
use gst_plugin::caps::Caps;
use gst_plugin::caps;
use gst_plugin::bytes::*;
use slog::*;
const AUDIO_STREAM_ID: u32 = 0;
const VIDEO_STREAM_ID: u32 = 1;
#[derive(Debug)]
enum State {
Stopped,
NeedHeader,
Skipping {
audio: bool,
video: bool,
skip_left: u32,
},
Streaming,
}
#[derive(Debug)]
struct StreamingState {
audio: Option<AudioFormat>,
expect_audio: bool,
video: Option<VideoFormat>,
expect_video: bool,
got_all_streams: bool,
last_position: Option<u64>,
metadata: Option<Metadata>,
aac_sequence_header: Option<Buffer>,
avc_sequence_header: Option<Buffer>,
}
impl StreamingState {
fn new(audio: bool, video: bool) -> StreamingState {
StreamingState {
audio: None,
expect_audio: audio,
video: None,
expect_video: video,
got_all_streams: false,
last_position: None,
metadata: None,
aac_sequence_header: None,
avc_sequence_header: None,
}
}
}
#[derive(Debug, Eq, Clone)]
struct AudioFormat {
format: flavors::SoundFormat,
rate: u16,
width: u8,
channels: u8,
bitrate: Option<u32>,
aac_sequence_header: Option<Buffer>,
}
// Ignores bitrate
impl PartialEq for AudioFormat {
fn eq(&self, other: &Self) -> bool {
self.format.eq(&other.format) && self.rate.eq(&other.rate) &&
self.width.eq(&other.width) && self.channels.eq(&other.channels) &&
self.aac_sequence_header.eq(&other.aac_sequence_header)
}
}
impl AudioFormat {
fn new(data_header: &flavors::AudioDataHeader,
metadata: &Option<Metadata>,
aac_sequence_header: &Option<Buffer>)
-> AudioFormat {
let numeric_rate = match (data_header.sound_format, data_header.sound_rate) {
(flavors::SoundFormat::NELLYMOSER_16KHZ_MONO, _) => 16000,
(flavors::SoundFormat::NELLYMOSER_8KHZ_MONO, _) => 8000,
(flavors::SoundFormat::MP3_8KHZ, _) => 8000,
(flavors::SoundFormat::SPEEX, _) => 16000,
(_, flavors::SoundRate::_5_5KHZ) => 5512,
(_, flavors::SoundRate::_11KHZ) => 11025,
(_, flavors::SoundRate::_22KHZ) => 22050,
(_, flavors::SoundRate::_44KHZ) => 44100,
};
let numeric_width = match data_header.sound_size {
flavors::SoundSize::Snd8bit => 8,
flavors::SoundSize::Snd16bit => 16,
};
let numeric_channels = match data_header.sound_type {
flavors::SoundType::SndMono => 1,
flavors::SoundType::SndStereo => 2,
};
AudioFormat {
format: data_header.sound_format,
rate: numeric_rate,
width: numeric_width,
channels: numeric_channels,
bitrate: metadata.as_ref().and_then(|m| m.audio_bitrate),
aac_sequence_header: aac_sequence_header.clone(),
}
}
fn update_with_metadata(&mut self, metadata: &Metadata) -> bool {
let mut changed = false;
if self.bitrate != metadata.audio_bitrate {
self.bitrate = metadata.audio_bitrate;
changed = true;
}
changed
}
fn to_string(&self) -> Option<String> {
self.to_caps().map(|c| c.to_string())
}
fn to_caps(&self) -> Option<Caps> {
let mut caps = match self.format {
flavors::SoundFormat::MP3 |
flavors::SoundFormat::MP3_8KHZ => {
Some(Caps::new_simple("audio/mpeg",
&[("mpegversion", &caps::Value::Int(1)),
("layer", &caps::Value::Int(3))]))
}
flavors::SoundFormat::PCM_NE |
flavors::SoundFormat::PCM_LE => {
if self.rate != 0 && self.channels != 0 {
// Assume little-endian for "PCM_NE", it's probably more common and we have no
// way to know what the endianness of the system creating the stream was
Some(Caps::new_simple("audio/x-raw",
&[("layout",
&caps::Value::String("interleaved".into())),
("format",
&caps::Value::String(if self.width == 8 {
"U8".into()
} else {
"S16LE".into()
}))]))
} else {
None
}
}
flavors::SoundFormat::ADPCM => {
Some(Caps::new_simple("audio/x-adpcm",
&[("layout", &caps::Value::String("swf".into()))]))
}
flavors::SoundFormat::NELLYMOSER_16KHZ_MONO |
flavors::SoundFormat::NELLYMOSER_8KHZ_MONO |
flavors::SoundFormat::NELLYMOSER => Some(Caps::new_simple("audio/x-nellymoser", &[])),
flavors::SoundFormat::PCM_ALAW => Some(Caps::new_simple("audio/x-alaw", &[])),
flavors::SoundFormat::PCM_ULAW => Some(Caps::new_simple("audio/x-mulaw", &[])),
flavors::SoundFormat::AAC => {
self.aac_sequence_header.as_ref().map(|header| {
Caps::new_simple("audio/mpeg",
&[("mpegversion", &caps::Value::Int(4)),
("framed", &caps::Value::Bool(true)),
("stream-format", &caps::Value::String("raw".into())),
("codec_data", &caps::Value::Buffer(header.clone()))])
})
}
flavors::SoundFormat::SPEEX => {
let mut header = Buffer::new_with_size(80).unwrap();
{
let mut map = header.map_readwrite().unwrap();
let mut data = Cursor::new(map.as_mut_slice());
data.write(b"Speex 1.1.12").unwrap();
data.write(&[0; 14]).unwrap();
data.write_u32le(1).unwrap(); // version
data.write_u32le(80).unwrap(); // header size
data.write_u32le(16000).unwrap(); // sample rate
data.write_u32le(1).unwrap(); // mode = wideband
data.write_u32le(4).unwrap(); // mode bitstream version
data.write_u32le(1).unwrap(); // channels
data.write_i32le(-1).unwrap(); // bitrate
data.write_u32le(0x50).unwrap(); // frame size
data.write_u32le(0).unwrap(); // VBR
data.write_u32le(1).unwrap(); // frames per packet
data.write_u32le(0).unwrap(); // extra headers
data.write_u32le(0).unwrap(); // reserved 1
data.write_u32le(0).unwrap(); // reserved 2
}
let comment_size = 4 + 7 /* nothing */ + 4 + 1;
let mut comment = Buffer::new_with_size(comment_size).unwrap();
{
let mut map = comment.map_readwrite().unwrap();
let mut data = Cursor::new(map.as_mut_slice());
data.write_u32le(7).unwrap(); // length of "nothing"
data.write(b"nothing").unwrap(); // "vendor" string
data.write_u32le(0).unwrap(); // number of elements
data.write_u8(1);
}
Some(Caps::new_simple("audio/x-speex",
&[("streamheader",
&caps::Value::Array(vec![caps::Value::Buffer(header),
caps::Value::Buffer(comment)]))]))
}
flavors::SoundFormat::DEVICE_SPECIFIC => {
// Nobody knows
None
}
};
if self.rate != 0 {
caps.as_mut()
.map(|c| c.set_simple(&[("rate", &caps::Value::Int(self.rate as i32))]));
}
if self.channels != 0 {
caps.as_mut()
.map(|c| c.set_simple(&[("channels", &caps::Value::Int(self.channels as i32))]));
}
caps
}
}
#[derive(Debug, Eq, Clone)]
struct VideoFormat {
format: flavors::CodecId,
width: Option<u32>,
height: Option<u32>,
pixel_aspect_ratio: Option<(u32, u32)>,
framerate: Option<(u32, u32)>,
bitrate: Option<u32>,
avc_sequence_header: Option<Buffer>,
}
impl VideoFormat {
fn new(data_header: &flavors::VideoDataHeader,
metadata: &Option<Metadata>,
avc_sequence_header: &Option<Buffer>)
-> VideoFormat {
VideoFormat {
format: data_header.codec_id,
width: metadata.as_ref().and_then(|m| m.video_width),
height: metadata.as_ref().and_then(|m| m.video_height),
pixel_aspect_ratio: metadata.as_ref().and_then(|m| m.video_pixel_aspect_ratio),
framerate: metadata.as_ref().and_then(|m| m.video_framerate),
bitrate: metadata.as_ref().and_then(|m| m.video_bitrate),
avc_sequence_header: avc_sequence_header.clone(),
}
}
fn update_with_metadata(&mut self, metadata: &Metadata) -> bool {
let mut changed = false;
if self.width != metadata.video_width {
self.width = metadata.video_width;
changed = true;
}
if self.height != metadata.video_height {
self.height = metadata.video_height;
changed = true;
}
if self.pixel_aspect_ratio != metadata.video_pixel_aspect_ratio {
self.pixel_aspect_ratio = metadata.video_pixel_aspect_ratio;
changed = true;
}
if self.framerate != metadata.video_framerate {
self.framerate = metadata.video_framerate;
changed = true;
}
if self.bitrate != metadata.video_bitrate {
self.bitrate = metadata.video_bitrate;
changed = true;
}
changed
}
fn to_string(&self) -> Option<String> {
self.to_caps().map(|caps| caps.to_string())
}
fn to_caps(&self) -> Option<Caps> {
let mut caps = match self.format {
flavors::CodecId::SORENSON_H263 => {
Some(Caps::new_simple("video/x-flash-video",
&[("flvversion", &caps::Value::Int(1))]))
}
flavors::CodecId::SCREEN => Some(Caps::new_simple("video/x-flash-screen", &[])),
flavors::CodecId::VP6 => Some(Caps::new_simple("video/x-vp6-flash", &[])),
flavors::CodecId::VP6A => Some(Caps::new_simple("video/x-vp6-flash-alpha", &[])),
flavors::CodecId::SCREEN2 => Some(Caps::new_simple("video/x-flash-screen2", &[])),
flavors::CodecId::H264 => {
self.avc_sequence_header.as_ref().map(|header| {
Caps::new_simple("video/x-h264",
&[("stream-format", &caps::Value::String("avc".into())),
("codec_data", &caps::Value::Buffer(header.clone()))])
})
}
flavors::CodecId::H263 => Some(Caps::new_simple("video/x-h263", &[])),
flavors::CodecId::MPEG4Part2 => {
Some(Caps::new_simple("video/x-h263",
&[("mpegversion", &caps::Value::Int(4)),
("systemstream", &caps::Value::Bool(false))]))
}
flavors::CodecId::JPEG => {
// Unused according to spec
None
}
};
if let (Some(width), Some(height)) = (self.width, self.height) {
caps.as_mut().map(|c| {
c.set_simple(&[("width", &caps::Value::Int(width as i32)),
("height", &caps::Value::Int(height as i32))])
});
}
if let Some(par) = self.pixel_aspect_ratio {
if par.0 != 0 && par.1 != 0 {
caps.as_mut().map(|c| {
c.set_simple(&[("pixel-aspect-ratio",
&caps::Value::Fraction(par.0 as i32, par.1 as i32))])
});
}
}
if let Some(fps) = self.framerate {
if fps.1 != 0 {
caps.as_mut().map(|c| {
c.set_simple(&[("framerate",
&caps::Value::Fraction(fps.0 as i32, fps.1 as i32))])
});
}
}
caps
}
}
// Ignores bitrate
impl PartialEq for VideoFormat {
fn eq(&self, other: &Self) -> bool {
self.format.eq(&other.format) && self.width.eq(&other.width) &&
self.height.eq(&other.height) &&
self.pixel_aspect_ratio.eq(&other.pixel_aspect_ratio) &&
self.framerate.eq(&other.framerate) &&
self.avc_sequence_header.eq(&other.avc_sequence_header)
}
}
#[derive(Debug, PartialEq, Eq, Clone)]
struct Metadata {
duration: Option<u64>,
creation_date: Option<String>,
creator: Option<String>,
title: Option<String>,
metadata_creator: Option<String>, /* TODO: seek_table: _,
* filepositions / times metadata arrays */
audio_bitrate: Option<u32>,
video_width: Option<u32>,
video_height: Option<u32>,
video_pixel_aspect_ratio: Option<(u32, u32)>,
video_framerate: Option<(u32, u32)>,
video_bitrate: Option<u32>,
}
impl Metadata {
fn new(script_data: &flavors::ScriptData) -> Metadata {
assert_eq!(script_data.name, "onMetaData");
let mut metadata = Metadata {
duration: None,
creation_date: None,
creator: None,
title: None,
metadata_creator: None,
audio_bitrate: None,
video_width: None,
video_height: None,
video_pixel_aspect_ratio: None,
video_framerate: None,
video_bitrate: None,
};
let args = match script_data.arguments {
flavors::ScriptDataValue::Object(ref objects) |
flavors::ScriptDataValue::ECMAArray(ref objects) => objects,
_ => return metadata,
};
let mut par_n = None;
let mut par_d = None;
for arg in args {
match (arg.name, &arg.data) {
("duration", &flavors::ScriptDataValue::Number(duration)) => {
metadata.duration = Some((duration * 1000.0 * 1000.0 * 1000.0) as u64);
}
("creationdate", &flavors::ScriptDataValue::String(date)) => {
metadata.creation_date = Some(String::from(date));
}
("creator", &flavors::ScriptDataValue::String(creator)) => {
metadata.creator = Some(String::from(creator));
}
("title", &flavors::ScriptDataValue::String(title)) => {
metadata.title = Some(String::from(title));
}
("metadatacreator", &flavors::ScriptDataValue::String(creator)) => {
metadata.metadata_creator = Some(String::from(creator));
}
("audiodatarate", &flavors::ScriptDataValue::Number(datarate)) => {
metadata.audio_bitrate = Some((datarate * 1024.0) as u32);
}
("width", &flavors::ScriptDataValue::Number(width)) => {
metadata.video_width = Some(width as u32);
}
("height", &flavors::ScriptDataValue::Number(height)) => {
metadata.video_height = Some(height as u32);
}
("framerate", &flavors::ScriptDataValue::Number(framerate)) if framerate >= 0.0 => {
if let Some((n, d)) = utils::f64_to_fraction(framerate) {
metadata.video_framerate = Some((n as u32, d as u32));
}
}
("AspectRatioX", &flavors::ScriptDataValue::Number(par_x)) => {
par_n = Some(par_x as u32);
}
("AspectRatioY", &flavors::ScriptDataValue::Number(par_y)) => {
par_d = Some(par_y as u32);
}
("videodatarate", &flavors::ScriptDataValue::Number(datarate)) => {
metadata.video_bitrate = Some((datarate * 1024.0) as u32);
}
_ => {}
}
}
if let (Some(par_n), Some(par_d)) = (par_n, par_d) {
metadata.video_pixel_aspect_ratio = Some((par_n, par_d));
}
metadata
}
}
#[derive(Debug)]
pub struct FlvDemux {
logger: Logger,
state: State,
adapter: Adapter,
// Only in >= State::Streaming
streaming_state: Option<StreamingState>,
}
impl FlvDemux {
pub fn new(element: Element) -> FlvDemux {
FlvDemux {
logger: Logger::root(GstDebugDrain::new(Some(&element),
"rsflvdemux",
0,
"Rust FLV demuxer"),
None),
state: State::Stopped,
adapter: Adapter::new(),
streaming_state: None,
}
}
pub fn new_boxed(element: Element) -> Box<Demuxer> {
Box::new(FlvDemux::new(element))
}
fn handle_script_tag(&mut self,
tag_header: &flavors::TagHeader)
-> Result<HandleBufferResult, FlowError> {
if self.adapter.get_available() < (15 + tag_header.data_size) as usize {
return Ok(HandleBufferResult::NeedMoreData);
}
self.adapter.flush(15).unwrap();
let buffer = self.adapter.get_buffer(tag_header.data_size as usize).unwrap();
let map = buffer.map_read().unwrap();
let data = map.as_slice();
match flavors::script_data(data) {
IResult::Done(_, ref script_data) if script_data.name == "onMetaData" => {
trace!(self.logger, "Got script tag: {:?}", script_data);
let metadata = Metadata::new(script_data);
debug!(self.logger, "Got metadata: {:?}", metadata);
let streaming_state = self.streaming_state.as_mut().unwrap();
let audio_changed = streaming_state.audio
.as_mut()
.map(|a| a.update_with_metadata(&metadata))
.unwrap_or(false);
let video_changed = streaming_state.video
.as_mut()
.map(|v| v.update_with_metadata(&metadata))
.unwrap_or(false);
streaming_state.metadata = Some(metadata);
if audio_changed || video_changed {
let mut streams = Vec::new();
if audio_changed {
if let Some(caps) = streaming_state.audio
.as_ref()
.and_then(|a| a.to_caps()) {
streams.push(Stream::new(AUDIO_STREAM_ID, caps, String::from("audio")));
}
}
if video_changed {
if let Some(caps) = streaming_state.video
.as_ref()
.and_then(|v| v.to_caps()) {
streams.push(Stream::new(VIDEO_STREAM_ID, caps, String::from("video")));
}
}
return Ok(HandleBufferResult::StreamsChanged(streams));
}
}
IResult::Done(_, ref script_data) => {
trace!(self.logger, "Got script tag: {:?}", script_data);
}
IResult::Error(_) |
IResult::Incomplete(_) => {
// ignore
}
}
Ok(HandleBufferResult::Again)
}
fn update_audio_stream(&mut self,
data_header: &flavors::AudioDataHeader)
-> Result<HandleBufferResult, FlowError> {
let logger = self.logger.clone();
trace!(logger, "Got audio data header: {:?}", data_header);
let streaming_state = self.streaming_state.as_mut().unwrap();
let new_audio_format = AudioFormat::new(data_header,
&streaming_state.metadata,
&streaming_state.aac_sequence_header);
if streaming_state.audio.as_ref() != Some(&new_audio_format) {
debug!(logger, "Got new audio format: {:?}", new_audio_format);
let new_stream = streaming_state.audio == None;
let caps = new_audio_format.to_caps();
if let Some(caps) = caps {
streaming_state.audio = Some(new_audio_format);
let stream = Stream::new(AUDIO_STREAM_ID, caps, String::from("audio"));
if new_stream {
return Ok(HandleBufferResult::StreamAdded(stream));
} else {
return Ok(HandleBufferResult::StreamChanged(stream));
}
} else {
streaming_state.audio = None;
}
}
if !streaming_state.got_all_streams && streaming_state.audio != None &&
(streaming_state.expect_video && streaming_state.video != None ||
!streaming_state.expect_video) {
streaming_state.got_all_streams = true;
return Ok(HandleBufferResult::HaveAllStreams);
}
Ok(HandleBufferResult::Again)
}
fn handle_audio_tag(&mut self,
tag_header: &flavors::TagHeader,
data_header: &flavors::AudioDataHeader)
-> Result<HandleBufferResult, FlowError> {
let res = self.update_audio_stream(data_header);
match res {
Ok(HandleBufferResult::Again) => (),
_ => return res,
}
if self.adapter.get_available() < (15 + tag_header.data_size) as usize {
return Ok(HandleBufferResult::NeedMoreData);
}
// AAC special case
if data_header.sound_format == flavors::SoundFormat::AAC {
// Not big enough for the AAC packet header, ship!
if tag_header.data_size < 1 + 1 {
self.adapter.flush(15 + tag_header.data_size as usize).unwrap();
warn!(self.logger,
"Too small packet for AAC packet header {}",
15 + tag_header.data_size);
return Ok(HandleBufferResult::Again);
}
let mut data = [0u8; 17];
self.adapter.peek_into(&mut data).unwrap();
match flavors::aac_audio_packet_header(&data[16..]) {
IResult::Error(_) |
IResult::Incomplete(_) => {
unimplemented!();
}
IResult::Done(_, header) => {
trace!(self.logger, "Got AAC packet header {:?}", header);
match header.packet_type {
flavors::AACPacketType::SequenceHeader => {
self.adapter.flush(15 + 1 + 1).unwrap();
let buffer = self.adapter
.get_buffer((tag_header.data_size - 1 - 1) as usize)
.unwrap();
debug!(self.logger,
"Got AAC sequence header {:?} of size {}",
buffer,
tag_header.data_size - 1 - 1);
let streaming_state = self.streaming_state.as_mut().unwrap();
streaming_state.aac_sequence_header = Some(buffer);
return Ok(HandleBufferResult::Again);
}
flavors::AACPacketType::Raw => {
// fall through
}
}
}
}
}
let streaming_state = self.streaming_state.as_ref().unwrap();
if streaming_state.audio == None {
self.adapter.flush((tag_header.data_size + 15) as usize).unwrap();
return Ok(HandleBufferResult::Again);
}
let audio = streaming_state.audio.as_ref().unwrap();
self.adapter.flush(16).unwrap();
let offset = match audio.format {
flavors::SoundFormat::AAC => 1,
_ => 0,
};
if tag_header.data_size == 0 {
return Ok(HandleBufferResult::Again);
}
if tag_header.data_size < offset {
self.adapter.flush((tag_header.data_size - 1) as usize).unwrap();
return Ok(HandleBufferResult::Again);
}
if offset > 0 {
self.adapter.flush(offset as usize).unwrap();
}
let mut buffer = self.adapter
.get_buffer((tag_header.data_size - 1 - offset) as usize)
.unwrap();
buffer.set_pts(Some((tag_header.timestamp as u64) * 1000 * 1000)).unwrap();
trace!(self.logger,
"Outputting audio buffer {:?} for tag {:?} of size {}",
buffer,
tag_header,
tag_header.data_size - 1);
Ok(HandleBufferResult::BufferForStream(AUDIO_STREAM_ID, buffer))
}
fn update_video_stream(&mut self,
data_header: &flavors::VideoDataHeader)
-> Result<HandleBufferResult, FlowError> {
let logger = self.logger.clone();
trace!(logger, "Got video data header: {:?}", data_header);
let streaming_state = self.streaming_state.as_mut().unwrap();
let new_video_format = VideoFormat::new(data_header,
&streaming_state.metadata,
&streaming_state.avc_sequence_header);
if streaming_state.video.as_ref() != Some(&new_video_format) {
debug!(logger, "Got new video format: {:?}", new_video_format);
let new_stream = streaming_state.video == None;
let caps = new_video_format.to_caps();
if let Some(caps) = caps {
streaming_state.video = Some(new_video_format);
let stream = Stream::new(VIDEO_STREAM_ID, caps, String::from("video"));
if new_stream {
return Ok(HandleBufferResult::StreamAdded(stream));
} else {
return Ok(HandleBufferResult::StreamChanged(stream));
}
} else {
streaming_state.video = None;
}
}
if !streaming_state.got_all_streams && streaming_state.video != None &&
(streaming_state.expect_audio && streaming_state.audio != None ||
!streaming_state.expect_audio) {
streaming_state.got_all_streams = true;
return Ok(HandleBufferResult::HaveAllStreams);
}
Ok(HandleBufferResult::Again)
}
fn handle_video_tag(&mut self,
tag_header: &flavors::TagHeader,
data_header: &flavors::VideoDataHeader)
-> Result<HandleBufferResult, FlowError> {
let res = self.update_video_stream(data_header);
match res {
Ok(HandleBufferResult::Again) => (),
_ => return res,
}
if self.adapter.get_available() < (15 + tag_header.data_size) as usize {
return Ok(HandleBufferResult::NeedMoreData);
}
let mut cts = 0;
// AVC/H264 special case
if data_header.codec_id == flavors::CodecId::H264 {
// Not big enough for the AVC packet header, ship!
if tag_header.data_size < 1 + 4 {
self.adapter.flush(15 + tag_header.data_size as usize).unwrap();
warn!(self.logger,
"Too small packet for AVC packet header {}",
15 + tag_header.data_size);
return Ok(HandleBufferResult::Again);
}
let mut data = [0u8; 20];
self.adapter.peek_into(&mut data).unwrap();
match flavors::avc_video_packet_header(&data[16..]) {
IResult::Error(_) |
IResult::Incomplete(_) => {
unimplemented!();
}
IResult::Done(_, header) => {
trace!(self.logger, "Got AVC packet header {:?}", header);
match header.packet_type {
flavors::AVCPacketType::SequenceHeader => {
self.adapter.flush(15 + 1 + 4).unwrap();
let buffer = self.adapter
.get_buffer((tag_header.data_size - 1 - 4) as usize)
.unwrap();
debug!(self.logger,
"Got AVC sequence header {:?} of size {}",
buffer,
tag_header.data_size - 1 - 4);
let streaming_state = self.streaming_state.as_mut().unwrap();
streaming_state.avc_sequence_header = Some(buffer);
return Ok(HandleBufferResult::Again);
}
flavors::AVCPacketType::NALU => {
cts = header.composition_time;
}
flavors::AVCPacketType::EndOfSequence => {
// Skip
self.adapter.flush(15 + tag_header.data_size as usize).unwrap();
return Ok(HandleBufferResult::Again);
}
}
}
}
}
let streaming_state = self.streaming_state.as_ref().unwrap();
if streaming_state.video == None {
self.adapter.flush((tag_header.data_size + 15) as usize).unwrap();
return Ok(HandleBufferResult::Again);
}
let video = streaming_state.video.as_ref().unwrap();
let is_keyframe = data_header.frame_type == flavors::FrameType::Key;
self.adapter.flush(16).unwrap();
let offset = match video.format {
flavors::CodecId::VP6 |
flavors::CodecId::VP6A => 1,
flavors::CodecId::H264 => 4,
_ => 0,
};
if tag_header.data_size == 0 {
return Ok(HandleBufferResult::Again);
}
if tag_header.data_size < offset {
self.adapter.flush((tag_header.data_size - 1) as usize).unwrap();
return Ok(HandleBufferResult::Again);
}
if offset > 0 {
self.adapter.flush(offset as usize).unwrap();
}
let mut buffer = self.adapter
.get_buffer((tag_header.data_size - 1 - offset) as usize)
.unwrap();
if !is_keyframe {
buffer.set_flags(BUFFER_FLAG_DELTA_UNIT).unwrap();
}
buffer.set_dts(Some((tag_header.timestamp as u64) * 1000 * 1000))
.unwrap();
// Prevent negative numbers
let pts = if cts < 0 && tag_header.timestamp < (-cts) as u32 {
0
} else {
((tag_header.timestamp as i64) + (cts as i64)) as u64
};
buffer.set_pts(Some(pts * 1000 * 1000)).unwrap();
trace!(self.logger,
"Outputting video buffer {:?} for tag {:?} of size {}, keyframe: {}",
buffer,
tag_header,
tag_header.data_size - 1 - offset,
is_keyframe);
Ok(HandleBufferResult::BufferForStream(VIDEO_STREAM_ID, buffer))
}
fn update_state(&mut self) -> Result<HandleBufferResult, FlowError> {
match self.state {
State::Stopped => unreachable!(),
State::NeedHeader => {
while self.adapter.get_available() >= 9 {
let mut data = [0u8; 9];
self.adapter.peek_into(&mut data).unwrap();
match flavors::header(&data) {
IResult::Error(_) |
IResult::Incomplete(_) => {
// fall through
}
IResult::Done(_, ref header) => {
debug!(self.logger, "Found FLV header: {:?}", header);
let skip = if header.offset < 9 {
0
} else {
header.offset - 9
};
self.adapter.flush(9).unwrap();
self.state = State::Skipping {
audio: header.audio,
video: header.video,
skip_left: skip,
};
return Ok(HandleBufferResult::Again);
}
}
self.adapter.flush(1).unwrap();
}
Ok(HandleBufferResult::NeedMoreData)
}
State::Skipping { audio, video, skip_left: 0 } => {
self.state = State::Streaming;
self.streaming_state = Some(StreamingState::new(audio, video));
Ok(HandleBufferResult::Again)
}
State::Skipping { ref mut skip_left, .. } => {
let skip = cmp::min(self.adapter.get_available(), *skip_left as usize);
self.adapter.flush(skip).unwrap();
*skip_left -= skip as u32;
Ok(HandleBufferResult::Again)
}
State::Streaming => {
if self.adapter.get_available() < 16 {
return Ok(HandleBufferResult::NeedMoreData);
}
let mut data = [0u8; 16];
self.adapter.peek_into(&mut data).unwrap();
match nom::be_u32(&data[0..4]) {
IResult::Error(_) |
IResult::Incomplete(_) => {
unimplemented!();
}
IResult::Done(_, previous_size) => {
trace!(self.logger, "Previous tag size {}", previous_size);
// Nothing to do here, we just consume it for now
}
}
let tag_header = match flavors::tag_header(&data[4..]) {
IResult::Error(_) |
IResult::Incomplete(_) => {
unimplemented!();
}
IResult::Done(_, tag_header) => tag_header,
};
let res = match tag_header.tag_type {
flavors::TagType::Script => {
trace!(self.logger, "Found script tag");
self.handle_script_tag(&tag_header)
}
flavors::TagType::Audio => {
trace!(self.logger, "Found audio tag");
let data_header = match flavors::audio_data_header(&data[15..]) {
IResult::Error(_) |
IResult::Incomplete(_) => {
unimplemented!();
}
IResult::Done(_, data_header) => data_header,
};
self.handle_audio_tag(&tag_header, &data_header)
}
flavors::TagType::Video => {
trace!(self.logger, "Found video tag");
let data_header = match flavors::video_data_header(&data[15..]) {
IResult::Error(_) |
IResult::Incomplete(_) => {
unimplemented!();
}
IResult::Done(_, data_header) => data_header,
};
self.handle_video_tag(&tag_header, &data_header)
}
};
if let Ok(HandleBufferResult::BufferForStream(_, ref buffer)) = res {
let streaming_state = self.streaming_state.as_mut().unwrap();
if let Some(pts) = buffer.get_pts() {
streaming_state.last_position = streaming_state.last_position
.map(|last| cmp::max(last, pts))
.or_else(|| Some(pts));
} else if let Some(dts) = buffer.get_dts() {
streaming_state.last_position = streaming_state.last_position
.map(|last| cmp::max(last, dts))
.or_else(|| Some(dts));
}
}
res
}
}
}
}
impl Demuxer for FlvDemux {
fn start(&mut self,
_upstream_size: Option<u64>,
_random_access: bool)
-> Result<(), ErrorMessage> {
self.state = State::NeedHeader;
Ok(())
}
fn stop(&mut self) -> Result<(), ErrorMessage> {
self.state = State::Stopped;
self.adapter.clear();
self.streaming_state = None;
Ok(())
}
fn seek(&mut self, start: u64, stop: Option<u64>) -> Result<SeekResult, ErrorMessage> {
unimplemented!();
}
fn handle_buffer(&mut self, buffer: Option<Buffer>) -> Result<HandleBufferResult, FlowError> {
if let Some(buffer) = buffer {
self.adapter.push(buffer);
}
self.update_state()
}
fn end_of_stream(&mut self) -> Result<(), ErrorMessage> {
// nothing to do here, all data we have left is incomplete
Ok(())
}
fn is_seekable(&self) -> bool {
false
}
fn get_position(&self) -> Option<u64> {
if let Some(StreamingState { last_position, .. }) = self.streaming_state {
return last_position;
}
None
}
fn get_duration(&self) -> Option<u64> {
if let Some(StreamingState { metadata: Some(Metadata { duration, .. }), .. }) =
self.streaming_state {
return duration;
}
None
}
}
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