wip

Cargo.toml

@@ -9,6 +9,11 @@ edition = "2018"
 [dependencies]
 num-rational = "0.3.0"
 byteorder = "1.3.4"
+tide = "0.11.0"
+lazy_static = "1.4.0"
+async-std = { version = "1.6.2", features = ["attributes"] }
+uuid = { version = "0.4", features = ["serde", "v4"] }
+http-types = "2.2.1"
 
 [dependencies.ffmpeg-sys-next]
 version = "4.3.0"

src/av/avio.rs

@@ -1,10 +1,11 @@
 use crate::av::as_ptr::{AsMutPtr, AsPtr};
-use ffmpeg_sys_next::{av_malloc, avio_alloc_context, avio_flush, AVIOContext};
+use ffmpeg_sys_next::{
+    av_free, av_malloc, avio_alloc_context, avio_context_free, avio_flush, AVIOContext,
+};
 use std::cmp::min;
 use std::os::raw::c_void;
 use std::vec::Vec;
 
-#[derive(Clone)]
 pub struct AVIO<T> {
     ctx: *mut AVIOContext,
     inner: Box<AVIOInner<T>>,
@@ -50,7 +51,6 @@ unsafe extern "C" fn write_packet_with_inner(ctx: *mut c_void, buffer: *mut u8,
 }
 
 unsafe extern "C" fn seek_with_inner(ctx: *mut c_void, offset: i64, whence: i32) -> i64 {
-    println!("ok");
     let mut avio: Box<AVIOInner<Box<dyn AVIOSeekable>>> = Box::from_raw(ctx.cast());
     avio.data.seek(offset, whence);
     std::mem::forget(avio);
@@ -110,6 +110,15 @@ impl<T> AVIO<T> {
     }
 }
 
+impl<T> Drop for AVIO<T> {
+    fn drop(&mut self) {
+        unsafe {
+            av_free((*self.ctx).buffer.cast());
+            avio_context_free(&mut self.ctx);
+        }
+    }
+}
+
 impl<T> AsMutPtr<AVIOContext> for AVIO<T> {
     fn as_mut_ptr(&self) -> *mut AVIOContext {
         self.ctx
@@ -124,37 +133,43 @@ impl<T> AsPtr<AVIOContext> for AVIO<T> {
 
 impl<T: AVIOReader + AVIOWriter + AVIOSeekable> AVIO<T> {
     pub fn duplex_with_seek(item: T) -> AVIO<T> {
-        AVIO::new(4096, item, Some(T::read), Some(T::write), Some(T::seek))
+        AVIO::new(
+            4096 * 4096,
+            item,
+            Some(T::read),
+            Some(T::write),
+            Some(T::seek),
+        )
     }
 }
 
 impl<T: AVIOReader + AVIOWriter> AVIO<T> {
     pub fn duplex(item: T) -> AVIO<T> {
-        AVIO::new(4096, item, Some(T::read), Some(T::write), None)
+        AVIO::new(4096 * 4096, item, Some(T::read), Some(T::write), None)
     }
 }
 
 impl<T: AVIOReader + AVIOSeekable> AVIO<T> {
     pub fn reader_with_seek(item: T) -> AVIO<T> {
-        AVIO::new(4096, item, Some(T::read), None, Some(T::seek))
+        AVIO::new(4096 * 4096, item, Some(T::read), None, Some(T::seek))
     }
 }
 
 impl<T: AVIOReader> AVIO<T> {
     pub fn reader(item: T) -> AVIO<T> {
-        AVIO::new(4096, item, Some(T::read), None, None)
+        AVIO::new(4096 * 4096, item, Some(T::read), None, None)
     }
 }
 
 impl<T: AVIOWriter + AVIOSeekable> AVIO<T> {
     pub fn writer_with_seek(item: T) -> AVIO<T> {
-        AVIO::new(4096, item, None, Some(T::write), Some(T::seek))
+        AVIO::new(4096 * 4096, item, None, Some(T::write), Some(T::seek))
     }
 }
 
 impl<T: AVIOWriter> AVIO<T> {
     pub fn writer(item: T) -> AVIO<T> {
-        AVIO::new(4096, item, None, Some(T::write), None)
+        AVIO::new(4096 * 4096, item, None, Some(T::write), None)
     }
 }
 

src/av/decoder.rs

@@ -6,10 +6,10 @@ use crate::av::xcoder::{process_return, XCoder};
 use crate::av::{decoder_from_name, verify_response};
 use crate::av_err2str;
 use ffmpeg_sys_next::{
-    avcodec_parameters_to_context, avcodec_receive_frame, avcodec_send_packet, AVCodecContext,
+    avcodec_free_context, avcodec_parameters_to_context, avcodec_receive_frame,
+    avcodec_send_packet, AVCodecContext,
 };
 
-#[derive(Copy, Clone)]
 pub struct Decoder(pub *mut AVCodecContext);
 
 impl Decoder {
@@ -56,3 +56,9 @@ impl XCoder for Decoder {
         Ok(())
     }
 }
+
+impl Drop for Decoder {
+    fn drop(&mut self) {
+        unsafe { avcodec_free_context(&mut self.as_mut_ptr()) }
+    }
+}

src/av/encoder.rs

@@ -1,14 +1,13 @@
 use crate::av::as_ptr::AsMutPtr;
 use crate::av::frame::Frame;
 use crate::av::packet::Packet;
-use crate::av::scaler::Scaler;
 use crate::av::stream::Stream;
 use crate::av::xcoder::{process_return, XCoder};
 use crate::av::{encoder_from_name, verify_response};
 use crate::av_err2str;
 use ffmpeg_sys_next::{
-    avcodec_parameters_from_context, avcodec_receive_packet, avcodec_send_frame, sws_freeContext,
+    avcodec_free_context, avcodec_parameters_from_context, avcodec_receive_packet,
-    AVCodecContext,
+    avcodec_send_frame, AVCodecContext,
 };
 
 pub struct Encoder(pub *mut AVCodecContext);
@@ -88,8 +87,8 @@ impl XCoder for Encoder {
     }
 }
 
-impl Drop for Scaler {
+impl Drop for Encoder {
     fn drop(&mut self) {
-        unsafe { sws_freeContext(self.as_mut_ptr()) }
+        unsafe { avcodec_free_context(&mut self.as_mut_ptr()) }
     }
 }

src/av/format.rs

@@ -4,19 +4,19 @@ use crate::av::dictionary::Dictionary;
 use crate::av::options::Options;
 use crate::av::packet::Packet;
 use crate::av::stream::Stream;
-use crate::av::{decoder_codec_from_name, verify_response};
+use crate::av::{decoder_codec_from_name, verify_response, Rational};
 use ffmpeg_sys_next::{
-    av_interleaved_write_frame, av_read_frame, av_write_frame, av_write_trailer,
+    av_find_best_stream, av_interleaved_write_frame, av_read_frame, av_seek_frame, av_write_frame,
-    avformat_alloc_context, avformat_alloc_output_context2, avformat_find_stream_info,
+    av_write_trailer, avformat_alloc_context, avformat_alloc_output_context2,
-    avformat_init_output, avformat_new_stream, avformat_open_input, avformat_write_header,
+    avformat_find_stream_info, avformat_free_context, avformat_init_output, avformat_new_stream,
-    avio_open2, AVFormatContext, AVMediaType, AVIO_FLAG_WRITE,
+    avformat_open_input, avformat_write_header, avio_context_free, avio_open2, AVFormatContext,
+    AVMediaType, AVIO_FLAG_WRITE, AVSEEK_FLAG_BACKWARD, AV_TIME_BASE,
 };
 use std::ffi::CString;
 use std::fmt::{Debug, Error, Formatter};
 use std::os::raw::{c_int, c_void};
 use std::ptr::{null, null_mut};
 
-#[derive(Clone)]
 pub struct Format<T> {
     pub ctx: *mut AVFormatContext,
     pub avio: Option<AVIO<T>>,
@@ -39,16 +39,45 @@ impl<T> Format<T> {
 }
 
 impl<T> Format<T> {
-    pub fn stream(&self, stream_type: AVMediaType, index: Option<i32>) -> Option<Stream> {
+    pub fn seek(&self, seconds: u32, stream: Option<&Stream>) -> Result<(), String> {
+        let seconds: i32 = seconds as i32;
+        let time_base = stream.map(|s| s.time_base().den()).unwrap_or(AV_TIME_BASE);
+        verify_response("Failed to seek", unsafe {
+            av_seek_frame(
+                self.ctx,
+                stream.map(|s| s.index()).unwrap_or(-1),
+                (seconds * time_base) as i64,
+                AVSEEK_FLAG_BACKWARD,
+            )
+        })?;
+
+        Ok(())
+    }
+
+    pub fn stream(
+        &self,
+        stream_type: AVMediaType,
+        index: Option<i32>,
+        related: Option<i32>,
+    ) -> Result<Option<Stream>, String> {
         unsafe {
             let ctx = self.ctx;
             let mut stream = (*ctx).streams;
 
+            let index = if let Some(index) = index {
+                index
+            } else {
+                verify_response(
+                    "Failed finding best stream",
+                    av_find_best_stream(ctx, stream_type, -1, related.unwrap_or(-1), null_mut(), 0),
+                )?
+            };
+
             for _ in 0..(*ctx).nb_streams {
                 let curr_stream = *stream;
                 if (*(*curr_stream).codecpar).codec_type == stream_type {
-                    if index.is_none() || Some((*curr_stream).index) == index {
+                    if (*curr_stream).index == index {
-                        return Some(Stream(curr_stream));
+                        return Ok(Some(Stream(curr_stream)));
                     }
                 }
 
@@ -56,7 +85,7 @@ impl<T> Format<T> {
             }
         }
 
-        None
+        Ok(None)
     }
 
     pub fn as_mut_ptr(&self) -> *mut AVFormatContext {
@@ -72,6 +101,10 @@ impl<T> Format<T> {
         };
     }
 
+    pub fn duration(&self) -> i64 {
+        unsafe { (*self.ctx).duration }
+    }
+
     pub fn write_header(&self, options: Option<Dictionary>) -> Result<(), String> {
         verify_response("failed to write header to output", unsafe {
             avformat_write_header(
@@ -280,3 +313,16 @@ impl<T> AsMutVoidPtr for Format<T> {
 }
 
 impl<T> Options for Format<T> {}
+
+impl<T> Drop for Format<T> {
+    fn drop(&mut self) {
+        unsafe {
+            let mut pb = (*self.ctx).pb;
+
+            avformat_free_context(self.ctx);
+            if self.avio.is_none() {
+                avio_context_free(&mut pb);
+            }
+        }
+    }
+}

src/av/frame.rs

@@ -1,7 +1,7 @@
 use crate::av::as_ptr::{AsMutPtr, AsPtr};
 use crate::av::verify_response;
 use ffmpeg_sys_next::{
-    av_frame_alloc, av_frame_get_buffer, av_frame_unref, AVFrame, AVPictureType, AVPixelFormat,
+    av_frame_alloc, av_frame_free, av_frame_get_buffer, AVFrame, AVPictureType, AVPixelFormat,
     AVSampleFormat,
 };
 
@@ -25,12 +25,12 @@ impl Frame {
     }
 
     #[inline]
-    fn own(&mut self) {
+    pub fn own(&mut self) {
         self.owned = true
     }
 
     #[inline]
-    fn disown(&mut self) {
+    pub fn disown(&mut self) {
         self.owned = false
     }
 
@@ -177,6 +177,6 @@ impl Drop for Frame {
         if !self.owned {
             return;
         }
-        unsafe { av_frame_unref(self.ptr) }
+        unsafe { av_frame_free(&mut self.ptr) }
     }
 }

src/av/mod.rs

@@ -1,9 +1,10 @@
 use crate::av_err2str;
 use ffmpeg_sys_next::AVCodecID::AV_CODEC_ID_HEVC;
 use ffmpeg_sys_next::{
-    av_codec_is_decoder, av_codec_is_encoder, av_codec_next, av_inv_q, av_register_all,
+    av_codec_is_decoder, av_codec_is_encoder, av_codec_next, av_inv_q, av_log_set_level,
-    avcodec_alloc_context3, avcodec_find_decoder_by_name, avcodec_find_encoder_by_name, AVCodec,
+    av_register_all, avcodec_alloc_context3, avcodec_find_decoder_by_name,
-    AVCodecContext, AVCodecID, AVRational, AV_CODEC_CAP_HARDWARE,
+    avcodec_find_encoder_by_name, AVCodec, AVCodecContext, AVCodecID, AVRational,
+    AV_CODEC_CAP_HARDWARE,
 };
 use num_rational::Ratio;
 use std::any::type_name;
@@ -213,6 +214,7 @@ fn remove_if_exists(list: &mut Vec<FfmpegCodec>, needle: &str, to_remove: Vec<&s
 pub fn init() {
     unsafe {
         av_register_all();
+        av_log_set_level(-8);
     }
 }
 

src/av/packet.rs

@@ -1,7 +1,7 @@
 use crate::av::Rational;
 use ffmpeg_sys_next::AVPacketSideDataType::AV_PKT_DATA_NEW_EXTRADATA;
 use ffmpeg_sys_next::{
-    av_packet_alloc, av_packet_get_side_data, av_packet_rescale_ts, av_packet_unref, AVPacket,
+    av_packet_alloc, av_packet_free, av_packet_get_side_data, av_packet_rescale_ts, AVPacket,
 };
 
 pub struct Packet(pub *mut AVPacket);
@@ -98,7 +98,7 @@ impl Packet {
 impl Drop for Packet {
     fn drop(&mut self) {
         unsafe {
-            av_packet_unref(self.0);
+            av_packet_free(&mut self.0);
         }
     }
 }

src/av/resampler.rs

@@ -5,8 +5,8 @@ use crate::av::frame::Frame;
 use crate::av::verify_response;
 use crate::av::xcoder::XCoder;
 use ffmpeg_sys_next::{
-    swr_alloc, swr_alloc_set_opts, swr_convert_frame, swr_get_delay, AVFrame, AVSampleFormat,
+    swr_alloc, swr_alloc_set_opts, swr_convert_frame, swr_drop_output, swr_free, swr_get_delay,
-    SwrContext,
+    AVSampleFormat, SwrContext,
 };
 use std::ptr::{null, null_mut};
 
@@ -96,3 +96,12 @@ impl Resampler {
         }
     }
 }
+
+impl Drop for Resampler {
+    fn drop(&mut self) {
+        unsafe {
+            swr_drop_output(self.ptr, i32::MAX);
+            swr_free(&mut self.ptr)
+        }
+    }
+}

src/av/scaler.rs

@@ -4,7 +4,7 @@ use crate::av::encoder::Encoder;
 use crate::av::frame::Frame;
 use crate::av::verify_response;
 use crate::av::xcoder::XCoder;
-use ffmpeg_sys_next::{sws_getContext, sws_scale, AVPixelFormat, SwsContext};
+use ffmpeg_sys_next::{sws_freeContext, sws_getContext, sws_scale, AVPixelFormat, SwsContext};
 use std::os::raw::c_int;
 use std::ptr::null_mut;
 
@@ -150,3 +150,9 @@ impl AsMutPtr<SwsContext> for Scaler {
         self.ctx
     }
 }
+
+impl Drop for Scaler {
+    fn drop(&mut self) {
+        unsafe { sws_freeContext(self.as_mut_ptr()) }
+    }
+}

src/main.rs

@@ -1,13 +1,23 @@
 #![allow(dead_code)]
 
 use crate::av::init;
-use crate::transcoder::Transcoder;
+use crate::transcoder_manager::{TranscoderInstance, TranscoderManager};
+use async_std::fs::File;
+use async_std::sync::{Arc, RwLock};
 use ffmpeg_sys_next::{av_make_error_string, av_malloc, av_version_info};
+use http_types::Error as HttpError;
+use lazy_static::lazy_static;
+use std::collections::HashMap;
 use std::ffi::{CStr, CString};
+use std::option::Option::Some;
 use std::os::raw::{c_char, c_int};
+use std::str::FromStr;
+use tide::{Request, StatusCode};
+use uuid::Uuid;
 
 pub mod av;
 pub mod transcoder;
+pub mod transcoder_manager;
 pub mod utils;
 
 // const INPUT_PATH: &str = "/tank/ephemeral/anime/series/Witch Hunter Robin - 2ndfire/[2ndfire]Witch_Hunter_Robin_-_01[91DCE49A].mkv";
@@ -22,14 +32,114 @@ fn av_err2str(error_code: c_int) -> String {
     }
 }
 
-fn main() {
+lazy_static! {
-    println!("> transotf: ffmpeg {}", unsafe {
+    static ref HOME_PAGE: String = {
-        CStr::from_ptr(av_version_info()).to_str().unwrap()
+        format!(
-    });
+            "{}: {}\nffmpeg: {}",
+            env!("CARGO_PKG_NAME"),
+            env!("CARGO_PKG_VERSION"),
+            unsafe { CStr::from_ptr(av_version_info()).to_str().unwrap_or("n/a") },
+        )
+    };
+}
+
+#[derive(Default)]
+struct State {
+    manager: RwLock<TranscoderManager>,
+}
+
+async fn create_transcode(req: Request<State>) -> Result<String, HttpError> {
+    let params = req.query::<HashMap<String, String>>()?;
+    let target = params.get(&"target".to_string());
+    let target = if let Some(target) = target {
+        target
+    } else {
+        return Err(HttpError::from_str(
+            StatusCode::BadRequest,
+            "no target given",
+        ));
+    };
+
+    {
+        File::open(target).await.map_err(|err| {
+            HttpError::from_str(
+                StatusCode::BadRequest,
+                format!("Failed to open file: {}", err),
+            )
+        })?;
+    }
+
+    let id = req
+        .state()
+        .manager
+        .write()
+        .await
+        .start(target.clone(), None, None)
+        .map_err(|err| {
+            HttpError::from_str(
+                StatusCode::InternalServerError,
+                format!("Failed to start transcoder: {}", err),
+            )
+        })?;
+
+    Ok(format!("{}", id))
+}
+
+async fn get_init(req: Request<State>) -> Result<String, HttpError> {
+    let _manager = req.state().manager.read().await;
+    // manager.get()
+
+    Err(HttpError::from_str(StatusCode::NotFound, ":3"))
+}
+
+async fn get_instance(req: &Request<State>) -> Result<Arc<TranscoderInstance>, HttpError> {
+    let id = req.param::<String>("id")?;
+    let id = Uuid::from_str(&id)?;
+    let manager = req.state().manager.read().await;
+    if let Some(instance) = manager.get(id) {
+        Ok(instance)
+    } else {
+        Err(HttpError::from_str(
+            StatusCode::NotFound,
+            format!("Can't find transcoder with id {}", id),
+        ))
+    }
+}
+
+async fn get_manifest(req: Request<State>) -> Result<String, HttpError> {
+    let transcoder_instance = get_instance(&req).await?;
+    let (duration, segments, init_written) = transcoder_instance
+        .state(|item| {
+            (
+                item.duration(),
+                item.segments().clone(),
+                item.init_written(),
+            )
+                .clone()
+        })
+        .await;
+
+    Ok(format!("{} {:?} {}", duration, segments, init_written))
+}
+
+// async fn get_status(req: Request<State>) -> Result<String, HttpError> {
+//     let id = req.param::<String>("id")?;
+//     let id = Uuid::from_str(&id)?;
+//     let manager = req.state().manager.read().await;
+// }
+
+#[async_std::main]
+async fn main() -> std::io::Result<()> {
+    println!("{}", HOME_PAGE.clone());
 
     init();
 
-    let mut transcoder = Transcoder::create(INPUT_PATH, OUTPUT_PATH, None, None)
+    let mut app = tide::with_state(State::default());
-        .expect("Failed to create transcoder");
+    app.at("/").get(|_| async { Ok(HOME_PAGE.clone()) });
-    transcoder.transcode().expect("Failed to transcode");
+    app.at("/transcode").get(create_transcode);
+    // app.at("/session/:id").get(get_status);
+    app.at("/session/:id/manifest").get(get_manifest);
+    // app.at("/session/:id/{type}/init.mp4");
+    // app.at("/session/:id/{type}/{nr}.m4s");
+    app.listen("0:8000").await
 }

src/transcoder.rs

@@ -14,30 +14,14 @@ use crate::utils::SortedFrameBuffer;
 use ffmpeg_sys_next::AVMediaType::{AVMEDIA_TYPE_AUDIO, AVMEDIA_TYPE_VIDEO};
 use ffmpeg_sys_next::AVPictureType::AV_PICTURE_TYPE_I;
 use ffmpeg_sys_next::AVPixelFormat::AV_PIX_FMT_YUV420P;
-use ffmpeg_sys_next::{avio_wb32, AVIOContext, AVPixelFormat, SWS_BILINEAR};
+use ffmpeg_sys_next::{avio_wb32, AVIOContext, AVPixelFormat, AV_TIME_BASE, SWS_BILINEAR};
 use num_rational::Ratio;
+use std::cmp::min;
 use std::fs::{DirBuilder, File};
 use std::io::Write;
+use std::ops::Mul;
 use std::option::Option::Some;
 
-pub struct Transcoder {
-    input: Format<()>,
-    input_video: Stream,
-    input_frame_rate: Ratio<i32>,
-    video_output: Format<Buffer>,
-    output_path: String,
-    output_video: Stream,
-    video_frame_buffer: SortedFrameBuffer,
-    video_encoder: Encoder,
-    video_decoder: Decoder,
-    frame_scaler: Scaler,
-    last_pts: i64,
-    current_pts: i64,
-    video_segment: u32,
-    extra_data: Option<Vec<u8>>,
-    audio: Option<AudioTranscoder>,
-}
-
 pub struct AudioTranscoder {
     encoder: Encoder,
     decoder: Decoder,
@@ -50,8 +34,11 @@ pub struct AudioTranscoder {
     segment: u32,
     last_pts: i64,
     current_pts: i64,
+    seconds_per_segment: u32,
 }
 
+const SECONDS_PER_SEGMENT: u32 = 5;
+
 impl AudioTranscoder {
     fn process_packet(&mut self, packet: Packet) -> Result<(), String> {
         self.decoder
@@ -75,6 +62,11 @@ impl AudioTranscoder {
         Ok(())
     }
 
+    #[inline]
+    fn input_stream(&self) -> &Stream {
+        &self.input_stream
+    }
+
     fn start_segment(&self, force: bool) {
         if self.segment == 0 && !force {
             return;
@@ -122,6 +114,7 @@ impl AudioTranscoder {
         .unwrap()
         .write_all(&mut segment)
         .map_err(|_| format!("Failed to write audio segment {}", self.segment))?;
+
         self.start_segment(false);
 
         Ok(())
@@ -134,12 +127,10 @@ impl AudioTranscoder {
                 println!("WARN: new frame out of order");
             }
 
-            if (pts_passed + self.current_pts) > (5 * self.input_stream.time_base().den()) as i64 {
+            if (pts_passed + self.current_pts)
+                > (self.seconds_per_segment as i32 * self.input_stream.time_base().den()) as i64
+            {
                 self.format.write_packet_null()?;
-                println!(
-                    "Next audio segment (current: {}, pts: {}/{})!",
-                    self.segment, self.last_pts, self.current_pts,
-                );
                 self.write_segment()?;
                 self.segment += 1;
                 self.current_pts =
@@ -168,6 +159,28 @@ impl AudioTranscoder {
     }
 }
 
+pub struct Transcoder {
+    input: Format<()>,
+    input_video: Stream,
+    input_frame_rate: Ratio<i32>,
+    video_output: Format<Buffer>,
+    output_path: String,
+    output_video: Stream,
+    video_frame_buffer: SortedFrameBuffer,
+    video_encoder: Encoder,
+    video_decoder: Decoder,
+    frame_scaler: Scaler,
+    last_pts: i64,
+    current_pts: i64,
+    video_segment: u32,
+    extra_data: Option<Vec<u8>>,
+    audio: Option<AudioTranscoder>,
+    segment_target: Option<u32>,
+    input_video_index: Option<i32>,
+    input_audio_index: Option<i32>,
+    seconds_per_segment: u32,
+}
+
 impl Transcoder {
     pub fn create(
         input_path: &str,
@@ -179,10 +192,13 @@ impl Transcoder {
         let output_path = output_path.to_string();
 
         let input_video = input
-            .stream(AVMEDIA_TYPE_VIDEO, video_index)
+            .stream(AVMEDIA_TYPE_VIDEO, video_index, None)
+            .map_err(|err| format!("Failed to find video stream: {}", err))?
             .ok_or("Failed to find video stream".to_string())?;
 
-        let input_audio = input.stream(AVMEDIA_TYPE_AUDIO, audio_index);
+        let input_audio = input
+            .stream(AVMEDIA_TYPE_AUDIO, audio_index, Some(input_video.index()))
+            .map_err(|err| format!("Failed to find audio stream: {}", err))?;
         if audio_index.is_some() && input_audio.is_none() {
             return Err("Failed to find audio stream".to_string());
         }
@@ -233,30 +249,11 @@ impl Transcoder {
             encoder.set_frame_size(decoder.frame_size() * 4);
             encoder.open()?;
             encoder.configure(&output_stream)?;
-            println!(
-                "audio input stream: {}/{}",
-                input_stream.time_base().num(),
-                input_stream.time_base().den()
-            );
-
-            println!(
-                "audio decoder[{}] ({:?} {}hz | {}/{}) -> audio encoder[{}] ({:?} {}hz | {}/{})",
-                decoder.name(),
-                decoder.codec(),
-                decoder.sample_rate(),
-                decoder.time_base().num(),
-                decoder.time_base().den(),
-                encoder.name(),
-                encoder.codec(),
-                encoder.sample_rate(),
-                encoder.time_base().num(),
-                encoder.time_base().den(),
-            );
 
             let resampler = Resampler::from_coder(&decoder, &encoder);
             let mut audio_options = Dictionary::new();
-            audio_options.copy_from(&mut options);
+            audio_options.copy_from(&mut options)?;
-            format.init_output(audio_options);
+            format.init_output(audio_options)?;
 
             Some(AudioTranscoder {
                 frame_buffer: SortedFrameBuffer::new(),
@@ -270,6 +267,7 @@ impl Transcoder {
                 last_pts: 0,
                 segment: 0,
                 resampler,
+                seconds_per_segment: SECONDS_PER_SEGMENT,
             })
         } else {
             None
@@ -297,12 +295,6 @@ impl Transcoder {
             Ok(())
         })?;
 
-        println!(
-            "video decoder[{}] -> video encoder[{}]",
-            video_decoder.name(),
-            video_encoder.name()
-        );
-
         let param = output_video.params();
         param.set_height(video_decoder.height());
         param.set_width(video_decoder.width());
@@ -319,6 +311,8 @@ impl Transcoder {
             video_output,
             output_video,
             audio,
+            segment_target: None,
+            input_video_index: None,
             output_path,
             video_encoder,
             video_decoder,
@@ -328,30 +322,75 @@ impl Transcoder {
             current_pts: 0,
             video_segment: 0,
             extra_data: None,
+            input_audio_index: None,
+            seconds_per_segment: SECONDS_PER_SEGMENT,
         })
     }
 
-    pub fn transcode(&mut self) -> Result<(), String> {
+    pub fn seek(&self, segment: u32, stream: Option<&Stream>) -> Result<(), String> {
+        self.input.seek(segment * self.seconds_per_segment, stream)
+    }
+
+    pub fn open(&mut self) -> Result<(), String> {
         DirBuilder::new()
             .recursive(true)
             .create(self.output_path.to_string())
             .map_err(|_| "Failed to create target directory".to_string())?;
 
         self.video_output.write_header(None).unwrap();
-        let input_video_index = self.input_video.index();
+        self.input_video_index = Some(self.input_video.index());
-        let input_audio_index = self.audio.as_ref().map(|ia| ia.input_stream.index());
+        self.input_audio_index = self.audio.as_ref().map(|ia| ia.input_stream.index());
 
-        while let Some(packet) = self.input.next_packet() {
+        Ok(())
-            if input_video_index == packet.stream() {
+    }
+
+    pub fn duration(&self) -> i64 {
+        self.input.duration()
+    }
+
+    pub fn duration_secs(&self) -> f64 {
+        self.input.duration() as f64 / AV_TIME_BASE as f64
+    }
+
+    pub fn transcode(&mut self) -> Result<bool, String> {
+        Ok(if let Some(packet) = self.input.next_packet() {
+            if self.input_video_index == Some(packet.stream()) {
                 self.video_process_packet(packet)?;
-            } else if input_audio_index == Some(packet.stream()) {
+            } else if self.input_audio_index == Some(packet.stream()) {
                 // Safe assumption
                 if let Some(ref mut audio) = &mut self.audio {
                     audio.process_packet(packet)?;
                 }
             }
+
+            true
+        } else {
+            false
+        })
+    }
+
+    #[inline]
+    pub fn video_stream(&self) -> &Stream {
+        &self.input_video
+    }
+
+    #[inline]
+    pub fn audio_stream(&self) -> Option<&Stream> {
+        if let Some(ref audio) = self.audio {
+            Some(audio.input_stream())
+        } else {
+            None
         }
+    }
+
+    pub fn segment(&self) -> u32 {
+        min(
+            self.video_segment,
+            self.audio.as_ref().map_or(u32::MAX, |audio| audio.segment),
+        )
+    }
 
+    pub fn finish(&mut self) -> Result<(), String> {
         self.encode_video()?;
         self.video_output.write_trailer()?;
         self.video_write_segment()?;
@@ -362,7 +401,21 @@ impl Transcoder {
     fn video_process_packet(&mut self, packet: Packet) -> Result<(), String> {
         self.video_decoder.send_packet(&packet)?;
         while let Some(frame) = self.video_decoder.read_frame()? {
+            let segment: u32 = (self
+                .input_video
+                .time_base()
+                .to_num()
+                .mul(packet.pts() as i32)
+                .to_integer()
+                / self.seconds_per_segment as i32) as u32;
+            if let Some(target) = self.segment_target {
+                if target - 1 < segment {
+                    continue;
+                }
+            }
+
             let pts = frame.pts();
+
             let frame = self
                 .frame_scaler
                 .scale(frame)
@@ -407,21 +460,17 @@ impl Transcoder {
         .write_all(&mut segment)
         .map_err(|_| format!("Failed to write video segment {}", self.video_segment))?;
         self.start_segment(false);
-
         self.video_encoder.flush();
-
         Ok(())
     }
 
     fn encode_video(&mut self) -> Result<(), String> {
         while let Some(frame) = self.video_frame_buffer.pop_first() {
             let pts_passed = frame.pts() - self.last_pts;
-            if (pts_passed + self.current_pts) > (5 * self.input_frame_rate.den()) as i64 {
+            if (pts_passed + self.current_pts)
+                > (self.seconds_per_segment * self.input_frame_rate.den() as u32) as i64
+            {
                 self.video_output.write_packet_null()?;
-                println!(
-                    "Next video segment (current: {}, pts: {}/{})!",
-                    self.video_segment, self.last_pts, self.current_pts,
-                );
                 self.video_write_segment()?;
                 self.video_segment += 1;
                 self.current_pts =
@@ -492,9 +541,11 @@ impl Transcoder {
             ffio_wfourcc(pb, b"msix");
         }
     }
+
+    pub fn stop(self) {}
 }
 
-#[derive(Clone, Default, Debug)]
+#[derive(Default, Debug)]
 struct Buffer {
     buffer: Vec<u8>,
 }

src/transcoder_manager.rs

@@ -0,0 +1,256 @@
+use crate::transcoder::Transcoder;
+use async_std::sync::{Arc, Receiver, RecvError, RwLock, RwLockReadGuard, Sender, TryRecvError};
+use async_std::task;
+use std::collections::{HashMap, HashSet};
+use std::option::Option::Some;
+use std::thread::Builder;
+use std::thread::JoinHandle;
+use uuid::Uuid;
+
+#[derive(Debug)]
+pub struct TranscoderInstance {
+    id: Uuid,
+    channel: Channel<Message>,
+    state: RwLock<TranscoderInstanceState>,
+    command: TranscoderCommand,
+}
+
+impl TranscoderInstance {
+    pub async fn state<T>(&self, block: fn(RwLockReadGuard<TranscoderInstanceState>) -> T) -> T {
+        block(self.state.read().await)
+    }
+}
+
+#[derive(Debug, Default)]
+pub struct TranscoderInstanceState {
+    thread: Option<JoinHandle<()>>,
+    duration_secs: f64,
+    segments: HashSet<u32>,
+    init_written: bool,
+}
+
+impl TranscoderInstanceState {
+    #[inline]
+    pub fn duration(&self) -> f64 {
+        self.duration_secs
+    }
+
+    #[inline]
+    pub fn segments(&self) -> &HashSet<u32> {
+        &self.segments
+    }
+
+    #[inline]
+    pub fn init_written(&self) -> bool {
+        self.init_written
+    }
+}
+
+#[derive(Debug, Default)]
+pub struct TranscoderManager {
+    instances: HashMap<Uuid, Arc<TranscoderInstance>>,
+}
+
+#[derive(Debug, Clone)]
+pub struct Channel<T> {
+    receiver: Receiver<T>,
+    sender: Sender<T>,
+}
+
+impl<T> Channel<T> {
+    async fn send(&self, msg: T) {
+        self.sender.send(msg).await
+    }
+
+    fn send_blocking(&self, msg: T) {
+        task::block_on(self.sender.send(msg))
+    }
+
+    async fn recv(&self) -> Result<T, RecvError> {
+        self.receiver.recv().await
+    }
+
+    fn recv_blocking(&self) -> Result<T, RecvError> {
+        task::block_on(self.receiver.recv())
+    }
+
+    fn try_recv(&self) -> Result<T, TryRecvError> {
+        self.receiver.try_recv()
+    }
+}
+
+fn new_channel() -> (Channel<Message>, Channel<Message>) {
+    let (sender_a, receiver_a) = async_std::sync::channel(25);
+    let (sender_b, receiver_b) = async_std::sync::channel(25);
+
+    (
+        Channel {
+            sender: sender_a,
+            receiver: receiver_b,
+        },
+        Channel {
+            sender: sender_b,
+            receiver: receiver_a,
+        },
+    )
+}
+
+#[derive(Debug, Clone)]
+pub struct TranscoderCommand {
+    input: String,
+    output: String,
+    audio: Option<i32>,
+    video: Option<i32>,
+}
+
+#[derive(Debug)]
+pub enum Message {
+    Info { duration_secs: f64 },
+    SegmentReady(u32),
+    Seek(u32),
+    Failure(String),
+    Stop,
+    Finished,
+}
+
+fn transcoder_thread_main(command: TranscoderCommand, channel: Channel<Message>) {
+    if let Err(err) = transcoder_thread(command, &channel) {
+        channel.send_blocking(Message::Failure(err));
+        return;
+    }
+}
+
+fn transcoder_thread(command: TranscoderCommand, channel: &Channel<Message>) -> Result<(), String> {
+    let transcoder = Transcoder::create(
+        &command.input,
+        &command.output,
+        command.video,
+        command.audio,
+    );
+
+    let mut transcoder = match transcoder {
+        Ok(t) => t,
+        Err(e) => {
+            channel.send_blocking(Message::Failure(e));
+            return Ok(());
+        }
+    };
+
+    transcoder.open()?;
+
+    channel.send_blocking(Message::Info {
+        duration_secs: transcoder.duration_secs(),
+    });
+
+    let mut last_segment = transcoder.segment();
+    while transcoder.transcode()? {
+        while let Ok(msg) = channel.try_recv() {
+            match msg {
+                Message::Seek(segment) => {
+                    transcoder.seek(segment, Some(transcoder.video_stream()))?;
+                }
+                Message::Stop => {
+                    transcoder.stop();
+                    return Ok(());
+                }
+
+                _ => {}
+            };
+        }
+
+        if last_segment < transcoder.segment() {
+            channel.send_blocking(Message::SegmentReady(last_segment));
+            last_segment = transcoder.segment();
+        }
+    }
+
+    transcoder.finish()?;
+    channel.send_blocking(Message::SegmentReady(transcoder.segment()));
+    transcoder.stop();
+    channel.send_blocking(Message::Finished);
+
+    Ok(())
+}
+
+impl TranscoderManager {
+    pub fn start(
+        &mut self,
+        input: String,
+        audio: Option<i32>,
+        video: Option<i32>,
+    ) -> Result<Uuid, std::io::Error> {
+        let uuid = Uuid::new_v4();
+        let command = TranscoderCommand {
+            input: input.clone(),
+            output: format!("/tmp/transotf/{}/", uuid),
+            audio,
+            video,
+        };
+        let (thread_channel, own_channel) = new_channel();
+        let thread = {
+            let command = command.clone();
+            Builder::new()
+                .name(format!("t#{}", uuid))
+                .spawn(|| transcoder_thread_main(command, thread_channel))?
+        };
+
+        let instance = TranscoderInstance {
+            id: uuid,
+            command,
+            state: RwLock::new(TranscoderInstanceState {
+                thread: Some(thread),
+                init_written: false,
+                segments: HashSet::new(),
+                duration_secs: 0.0,
+            }),
+            channel: own_channel,
+        };
+
+        let instance = Arc::new(instance);
+        self.instances.insert(uuid, instance.clone());
+
+        task::spawn(async move {
+            loop {
+                let fut = instance.channel.recv();
+                if let Ok(x) = fut.await {
+                    match x {
+                        Message::Finished => {
+                            let mut state = instance.state.write().await;
+                            if let Some(join_handle) = std::mem::replace(&mut state.thread, None) {
+                                join_handle.join().unwrap();
+                            }
+
+                            break;
+                        }
+
+                        Message::Info { duration_secs } => {
+                            let mut state = instance.state.write().await;
+                            state.duration_secs = duration_secs
+                        }
+
+                        Message::SegmentReady(segment) => {
+                            let mut state = instance.state.write().await;
+                            if segment == 0 {
+                                state.init_written = true
+                            }
+
+                            state.segments.insert(segment);
+                        }
+
+                        _ => {}
+                    }
+
+                    println!("> {:?}", x);
+                } else {
+                    return;
+                }
+            }
+        });
+
+        Ok(uuid)
+    }
+
+    pub fn get(&self, id: Uuid) -> Option<Arc<TranscoderInstance>> {
+        self.instances.get(&id).cloned()
+    }
+}

test/test.mpd

@@ -7,14 +7,14 @@
     <Period start="PT0.0S">
         <BaseURL>data/</BaseURL>
         <AdaptationSet contentType="video">
-            <Representation mimeType="video/mp4" codecs="avc1.640028" id="test" bandwidth="1654197" width="1920" height="1080" frameRate="24000/1001">
+            <Representation mimeType="video/mp4" codecs="avc1.640028" id="video" bandwidth="1654197" width="1920" height="1080" frameRate="24000/1001">
                 <SegmentTemplate media="video-segment-$Number%05d$.m4s"
                                  initialization="video-init.mp4" duration="5005" timescale="1001"
                                  startNumber="0"/>
             </Representation>
         </AdaptationSet>
         <AdaptationSet contentType="audio">
-            <Representation mimeType="audio/mp4" codecs="mp4a.40.2" >
+            <Representation id="audio" mimeType="audio/mp4" codecs="mp4a.40.2" >
                 <SegmentTemplate media="audio-segment-$Number%05d$.m4s"
                                  initialization="audio-init.mp4" duration="5000" timescale="1000"
                                  startNumber="0"/>