From 7f16d8488289340a19f43937a18a1c039e8768f5 Mon Sep 17 00:00:00 2001 From: Will Storey Date: Sat, 31 Dec 2016 13:12:45 -0800 Subject: [PATCH] Initial import This works for streaming mp4 from rtsp. But only to the first client as it is unable to recognize discrete frames correctly. It needs further work. --- COPYING | 674 ++++++++++++++++++++++++++++++ cmd/remux_example/Makefile | 58 +++ cmd/remux_example/remux_example.c | 49 +++ index.html | 21 + videostreamer.c | 312 ++++++++++++++ videostreamer.go | 617 +++++++++++++++++++++++++++ videostreamer.h | 27 ++ 7 files changed, 1758 insertions(+) create mode 100644 COPYING create mode 100644 cmd/remux_example/Makefile create mode 100644 cmd/remux_example/remux_example.c create mode 100644 index.html create mode 100644 videostreamer.c create mode 100644 videostreamer.go create mode 100644 videostreamer.h diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/COPYING @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. diff --git a/cmd/remux_example/Makefile b/cmd/remux_example/Makefile new file mode 100644 index 0000000..63563c7 --- /dev/null +++ b/cmd/remux_example/Makefile @@ -0,0 +1,58 @@ +CC=gcc + +# Reviewed warnings for gcc 6.2.1 +CFLAGS = \ + -std=c11 -g -ggdb -pedantic -pedantic-errors \ + -Werror -Wall -Wextra \ + -Wformat=2 \ + -Wformat-signedness \ + -Wnull-dereference \ + -Winit-self \ + -Wmissing-include-dirs \ + -Wshift-overflow=2 \ + -Wswitch-default \ + -Wswitch-enum \ + -Wunused-const-variable=2 \ + -Wuninitialized \ + -Wunknown-pragmas \ + -Wstrict-overflow=5 \ + -Wsuggest-attribute=pure \ + -Wsuggest-attribute=const \ + -Wsuggest-attribute=noreturn \ + -Wsuggest-attribute=format \ + -Warray-bounds=2 \ + -Wduplicated-cond \ + -Wfloat-equal \ + -Wundef \ + -Wshadow \ + -Wbad-function-cast \ + -Wcast-qual \ + -Wcast-align \ + -Wwrite-strings \ + -Wconversion \ + -Wjump-misses-init \ + -Wlogical-op \ + -Waggregate-return \ + -Wcast-align \ + -Wstrict-prototypes \ + -Wold-style-definition \ + -Wmissing-prototypes \ + -Wmissing-declarations \ + -Wpacked \ + -Wredundant-decls \ + -Wnested-externs \ + -Winline \ + -Winvalid-pch \ + -Wstack-protector + +TARGETS=remux_example + +all: $(TARGETS) + +remux_example: remux_example.c \ + ../../videostreamer.c ../../videostreamer.h + $(CC) $(CFLAGS) -I../../ -o $@ $< ../../videostreamer.c -lavformat \ + -lavdevice -lavcodec -lavutil + +clean: + rm -f $(TARGETS) diff --git a/cmd/remux_example/remux_example.c b/cmd/remux_example/remux_example.c new file mode 100644 index 0000000..0c98f70 --- /dev/null +++ b/cmd/remux_example/remux_example.c @@ -0,0 +1,49 @@ +#include +#include +#include + +int main(const int argc, const char * const argv) +{ + if (argc != 2) { + printf("Usage: %s \n", argv[0]); + return 1; + } + + vs_setup(); + + const char * const input_format = "rtsp"; + const char * const input_url = argv[1]; + const char * const output_format = "mp4"; + const char * const output_url = "file:/tmp/out.mp4"; + const bool verbose = true; + + struct Videostreamer * const vs = vs_open(input_format, input_url, + output_format, output_url, verbose); + if (!vs) { + printf("unable to open videostreamer\n"); + return 1; + } + + const int max_frames = 100; + int i = 0; + + while (1) { + const int frame_size = vs_read_write(vs, verbose); + if (frame_size == -1) { + printf("read/write failed\n"); + vs_destroy(vs); + return 1; + } + + printf("frame size %d\n", frame_size); + + i++; + if (i == max_frames) { + break; + } + } + + vs_destroy(vs); + + return 0; +} diff --git a/index.html b/index.html new file mode 100644 index 0000000..2a1481a --- /dev/null +++ b/index.html @@ -0,0 +1,21 @@ + + +Now playing + + + + + +

Now playing

+ + + + diff --git a/videostreamer.c b/videostreamer.c new file mode 100644 index 0000000..5fa4740 --- /dev/null +++ b/videostreamer.c @@ -0,0 +1,312 @@ +// +// The logic here is heavily based on remuxing.c by Stefano Sabatini. +// + +#include +#include +#include +#include +#include +#include +#include "videostreamer.h" + +static void +__vs_log_packet(const AVFormatContext * const, + const AVPacket * const, const char * const); + + +void +vs_setup(void) +{ + // Set up library. + + // Register muxers, demuxers, and protocols. + av_register_all(); + + // Make formats available. + avdevice_register_all(); + + avformat_network_init(); +} + +struct Videostreamer * +vs_open(const char * const input_format_name, const char * const input_url, + const char * const output_format_name, const char * const output_url, + const bool verbose) +{ + if (!input_format_name || strlen(input_format_name) == 0 || + !input_url || strlen(input_url) == 0 || + !output_format_name || strlen(output_format_name) == 0 || + !output_url || strlen(output_url) == 0) { + printf("%s\n", strerror(EINVAL)); + return NULL; + } + + struct Videostreamer * const vs = calloc(1, sizeof(struct Videostreamer)); + if (!vs) { + printf("%s\n", strerror(errno)); + return NULL; + } + + + // Open input. + + AVInputFormat * const input_format = av_find_input_format(input_format_name); + if (!input_format) { + printf("input format not found\n"); + vs_destroy(vs); + return NULL; + } + + if (avformat_open_input(&vs->input_format_ctx, input_url, input_format, + NULL) != 0) { + printf("unable to open input\n"); + vs_destroy(vs); + return NULL; + } + + if (avformat_find_stream_info(vs->input_format_ctx, NULL) < 0) { + printf("failed to find stream info\n"); + vs_destroy(vs); + return NULL; + } + + if (verbose) { + av_dump_format(vs->input_format_ctx, 0, input_url, 0); + } + + + // Open output. + + AVOutputFormat * const output_format = av_guess_format(output_format_name, + NULL, NULL); + if (!output_format) { + printf("output format not found\n"); + vs_destroy(vs); + return NULL; + } + + if (avformat_alloc_output_context2(&vs->output_format_ctx, output_format, + NULL, NULL) < 0) { + printf("unable to create output context\n"); + vs_destroy(vs); + return NULL; + } + + + // Copy the first video stream. + + vs->video_stream_index = -1; + + for (unsigned int i = 0; i < vs->input_format_ctx->nb_streams; i++) { + AVStream * const in_stream = vs->input_format_ctx->streams[i]; + + if (in_stream->codecpar->codec_type != AVMEDIA_TYPE_VIDEO) { + if (verbose) { + printf("skip non-video stream %u\n", i); + } + continue; + } + + AVStream * const out_stream = avformat_new_stream(vs->output_format_ctx, + NULL); + if (!out_stream) { + printf("unable to add stream\n"); + vs_destroy(vs); + return NULL; + } + + if (avcodec_parameters_copy(out_stream->codecpar, + in_stream->codecpar) < 0) { + printf("unable to copy codec parameters\n"); + vs_destroy(vs); + return NULL; + } + + // I take the first video stream only. + vs->video_stream_index = (int) i; + break; + } + + if (vs->video_stream_index == -1) { + printf("no video stream found\n"); + vs_destroy(vs); + return NULL; + } + + if (verbose) { + av_dump_format(vs->output_format_ctx, 0, output_url, 1); + } + + + // Open output file. + if (avio_open(&vs->output_format_ctx->pb, output_url, AVIO_FLAG_WRITE) < 0) { + printf("unable to open output file\n"); + vs_destroy(vs); + return NULL; + } + + + // Write file header. + + AVDictionary * opts = NULL; + + // -movflags frag_keyframe tells the mp4 muxer to fragment at each video + // keyframe. This is necessary for it to support output to a non-seekable + // file (e.g., pipe). + // + // -movflags isml+frag_keyframe is the same, except isml appears to be to + // make the output a live smooth streaming feed (as opposed to not live). I'm + // not sure the difference, but isml appears to be a microsoft + // format/protocol. + // + // To specify both, use isml+frag_keyframe as the value. + // + // I found that while Chrome had no trouble displaying the resulting mp4 with + // just frag_keyframe, Firefox would not until I also added empty_moov. + // empty_moov apparently writes some info at the start of the file. + if (av_dict_set(&opts, "movflags", "frag_keyframe+empty_moov", 0) < 0) { + printf("unable to set movflags opt\n"); + vs_destroy(vs); + return NULL; + } + + if (av_dict_set_int(&opts, "flush_packets", 1, 0) < 0) { + printf("unable to set flush_packets opt\n"); + vs_destroy(vs); + av_dict_free(&opts); + return NULL; + } + + if (avformat_write_header(vs->output_format_ctx, &opts) < 0) { + printf("unable to write header\n"); + vs_destroy(vs); + av_dict_free(&opts); + return NULL; + } + + + // Check any options that were not set. Because I'm not sure if all are + // appropriate to set through the avformat_write_header(). + if (av_dict_count(opts) != 0) { + printf("some options not set\n"); + vs_destroy(vs); + av_dict_free(&opts); + return NULL; + } + + av_dict_free(&opts); + + + return vs; +} + +void +vs_destroy(struct Videostreamer * const vs) +{ + if (!vs) { + return; + } + + if (vs->input_format_ctx) { + avformat_close_input(&vs->input_format_ctx); + avformat_free_context(vs->input_format_ctx); + } + + if (vs->output_format_ctx) { + // Write file trailer. + if (av_write_trailer(vs->output_format_ctx) != 0) { + printf("unable to write trailer\n"); + } + + if (avio_closep(&vs->output_format_ctx->pb) != 0) { + printf("avio_closep failed\n"); + } + + avformat_free_context(vs->output_format_ctx); + } + + free(vs); +} + +int +vs_read_write(const struct Videostreamer * vs, const bool verbose) +{ + if (!vs) { + printf("%s\n", strerror(errno)); + return -1; + } + + + // Read encoded frame (as a packet). + AVPacket pkt; + memset(&pkt, 0, sizeof(AVPacket)); + + if (av_read_frame(vs->input_format_ctx, &pkt) != 0) { + printf("unable to read frame\n"); + return -1; + } + + + // Ignore it if it's not our video stream. + if (pkt.stream_index != vs->video_stream_index) { + if (verbose) { + printf("skipping non video packet\n"); + } + return 0; + } + + + AVStream * const in_stream = vs->input_format_ctx->streams[pkt.stream_index]; + AVStream * const out_stream = + vs->output_format_ctx->streams[pkt.stream_index]; + + if (verbose) { + __vs_log_packet(vs->input_format_ctx, &pkt, "in"); + } + + + // Copy packet + pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, + out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX); + pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, + out_stream->time_base, AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX); + pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, + out_stream->time_base); + pkt.pos = -1; + + if (verbose) { + __vs_log_packet(vs->output_format_ctx, &pkt, "out"); + } + + + const int pkt_size = pkt.size; + + // Write encoded frame (as a packet). + + // av_interleaved_write_frame() works too, but I don't think it is needed. + // Using av_write_frame() skips buffering. + if (av_write_frame(vs->output_format_ctx, &pkt) != 0) { + printf("unable to write frame\n"); + av_packet_unref(&pkt); + return -1; + } + + av_packet_unref(&pkt); + + return pkt_size; +} + +static void +__vs_log_packet(const AVFormatContext * const format_ctx, + const AVPacket * const pkt, const char * const tag) +{ + AVRational * const time_base = &format_ctx->streams[pkt->stream_index]->time_base; + + printf("%s: pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d\n", + tag, + av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base), + av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base), + av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base), + pkt->stream_index); +} diff --git a/videostreamer.go b/videostreamer.go new file mode 100644 index 0000000..cd29568 --- /dev/null +++ b/videostreamer.go @@ -0,0 +1,617 @@ +package main + +import ( + "bufio" + "flag" + "fmt" + "log" + "net" + "net/http" + "net/http/fcgi" + "os" + "unsafe" +) + +// #include "videostreamer.h" +// #include +// #cgo LDFLAGS: -lavformat -lavdevice -lavcodec -lavutil +import "C" + +// Args holds command line arguments. +type Args struct { + ListenHost string + ListenPort int + InputFormat string + InputURL string + Verbose bool + // Serve with FCGI protocol (true) or HTTP (false). + FCGI bool + Encoder EncoderType +} + +// EncoderType defines the type of streaming we're doing. +type EncoderType int + +const ( + // AudioEncoder means to encode audio. + AudioEncoder EncoderType = iota + // VideoEncoder means to encode video. + VideoEncoder +) + +// HTTPHandler allows us to pass information to our request handlers. +type HTTPHandler struct { + Verbose bool + ClientChangeChan chan<- int + ClientChan chan<- Client + Encoder EncoderType +} + +// A Client is servicing one HTTP client. It receives frames from the reader. +type Client struct { + Frames chan Frame + Done chan struct{} +} + +// Frame is an audio/video frame (compressed and encoded). +type Frame struct { + Buffer []byte +} + +func main() { + args, err := getArgs() + if err != nil { + log.Fatalf("Invalid argument: %s", err) + } + + if args.Encoder == AudioEncoder { + C.as_setup() + } + if args.Encoder == VideoEncoder { + C.vs_setup() + } + + // Encoder writes to out pipe. Reader reads from in pipe. + in, out, err := os.Pipe() + if err != nil { + log.Fatalf("pipe: %s", err) + } + + // Changes in clients announce on this channel. +1 for new client, -1 for + // losing a client. + clientChangeChan := make(chan int) + + // Clients provide reader a channel to receive on. + // + // The reader acts as a publisher and clients act as subscribers. One + // publisher, potentially many subscribers. + clientChan := make(chan Client) + + // When encoder writes a frame, we know how large it is by a message on this + // channel. The encoder sends messages on this channel to the reader to + // inform it of this. The reader then knows how much to read and allows it to + // always read a single frame at a time, which is valid for a client to + // receive. Otherwise if it reads without knowing frame boundaries, it is + // difficult for it to know when it is valid to start sending data to a + // client that enters mid-encoding. + frameChan := make(chan int) + //frameChan := make(chan int, 128) + + go encoderSupervisor(out, args.InputFormat, args.InputURL, args.Verbose, + clientChangeChan, frameChan, args.Encoder) + go reader(args.Verbose, in, clientChan, frameChan) + + // Start serving either with HTTP or FastCGI. + + hostPort := fmt.Sprintf("%s:%d", args.ListenHost, args.ListenPort) + + handler := HTTPHandler{ + Verbose: args.Verbose, + ClientChangeChan: clientChangeChan, + ClientChan: clientChan, + Encoder: args.Encoder, + } + + if args.FCGI { + listener, err := net.Listen("tcp", hostPort) + if err != nil { + log.Fatalf("Unable to listen: %s", err) + } + + log.Printf("Starting to serve requests on %s (FastCGI)", hostPort) + + err = fcgi.Serve(listener, handler) + if err != nil { + log.Fatalf("Unable to serve: %s", err) + } + } else { + s := &http.Server{ + Addr: hostPort, + Handler: handler, + } + + log.Printf("Starting to serve requests on %s (HTTP)", hostPort) + + err = s.ListenAndServe() + if err != nil { + log.Fatalf("Unable to serve: %s", err) + } + } +} + +// getArgs retrieves and validates command line arguments. +func getArgs() (Args, error) { + listenHost := flag.String("host", "0.0.0.0", "Host to listen on.") + listenPort := flag.Int("port", 8080, "Port to listen on.") + format := flag.String("format", "pulse", "Input format. Examples: pulse for PulseAudio, mp3 for MP3, or rtsp for RTSP.") + input := flag.String("input", "", "Input URL valid for the given format. For MP3 you can give this as a path to a file. For PulseAudio you can give a value such as alsa_output.pci-0000_00_1f.3.analog-stereo.monitor to take input from a monitor. Use 'pactl list sources' to show the available PulseAudio sources. For RTSP you can provide a rtsp:// URL.") + verbose := flag.Bool("verbose", false, "Enable verbose logging output.") + fcgi := flag.Bool("fcgi", true, "Serve using FastCGI (true) or as a regular HTTP server.") + encoder := flag.String("encoder", "audio", "Stream audio or video. Each uses different encoding methods.") + + flag.Parse() + + if len(*listenHost) == 0 { + flag.PrintDefaults() + return Args{}, fmt.Errorf("you must provide a host") + } + + if len(*format) == 0 { + flag.PrintDefaults() + return Args{}, fmt.Errorf("you must provide an input format") + } + + if len(*input) == 0 { + flag.PrintDefaults() + return Args{}, fmt.Errorf("you must provide an input URL") + } + + encoderType := AudioEncoder + if *encoder == "audio" { + encoderType = AudioEncoder + } else if *encoder == "video" { + encoderType = VideoEncoder + } else { + flag.PrintDefaults() + return Args{}, fmt.Errorf("you must specify encoder as audio or video") + } + + return Args{ + ListenHost: *listenHost, + ListenPort: *listenPort, + InputFormat: *format, + InputURL: *input, + Verbose: *verbose, + FCGI: *fcgi, + Encoder: encoderType, + }, nil +} + +// The encoder supervisor deals with stopping and starting the encoder. +// +// We want there to be at most a single encoder goroutine active at any one +// time no matter how many clients there are. If there are zero clients, there +// should not be any encoding going on. +func encoderSupervisor(outPipe *os.File, inputFormat, inputURL string, + verbose bool, clientChangeChan <-chan int, frameChan chan<- int, + encoder EncoderType) { + // A count of how many clients are actively subscribed listening for + // audio/video. We start the encoder when this goes above zero, and stop it + // if it goes to zero. + clients := 0 + + // We close this channel to tell the encoder to stop. It receives no values. + var encoderStopChan chan struct{} + + // The encoder tells us when it stops by sending a message on this channel. + // Note I use sending a message as if this channel closes then the below loop + // will be busy until it is re-opened. + encoderDoneChan := make(chan struct{}) + + for { + select { + // A change in the number of clients. + case change := <-clientChangeChan: + // Gaining a client. + if change == 1 { + clients++ + + if verbose { + log.Printf("encoder supervisor: new client. %d clients connected", + clients) + } + + if clients == 1 { + if verbose { + log.Printf("encoder supervisor: starting encoder") + } + + encoderStopChan = make(chan struct{}) + + if encoder == AudioEncoder { + go audioEncoder(outPipe, inputFormat, inputURL, encoderStopChan, + encoderDoneChan, frameChan) + } + if encoder == VideoEncoder { + go videoEncoder(outPipe, inputFormat, inputURL, encoderStopChan, + encoderDoneChan, frameChan) + } + } + + continue + } + + // Losing a client. + clients-- + + if verbose { + log.Printf("encoder supervisor: lost client. %d clients connected", + clients) + } + + if clients == 0 { + // Tell encoder to stop. + close(encoderStopChan) + if verbose { + log.Printf("encoder supervisor: stopping encoder") + } + continue + } + + // Encoder stopped for some reason. Restart it if appropriate. + case <-encoderDoneChan: + if verbose { + log.Printf("encoder supervisor: encoder stopped") + } + + if clients == 0 { + // No clients. We don't need to restart it. + continue + } + + if verbose { + log.Printf("encoder supervisor: starting encoder") + } + + encoderStopChan = make(chan struct{}) + + if encoder == AudioEncoder { + go audioEncoder(outPipe, inputFormat, inputURL, encoderStopChan, + encoderDoneChan, frameChan) + } + if encoder == VideoEncoder { + go videoEncoder(outPipe, inputFormat, inputURL, encoderStopChan, + encoderDoneChan, frameChan) + } + } + } +} + +// audioEncoder opens an audio input and begins decoding. It re-encodes the +// audio out and writes it to a pipe. It informs the reader goroutine how large +// each audio frame it writes is. +func audioEncoder(outPipe *os.File, inputFormat, inputURL string, + stopChan <-chan struct{}, doneChan chan<- struct{}, frameChan chan<- int) { + inputFormatC := C.CString(inputFormat) + inputURLC := C.CString(inputURL) + verbose := C.bool(false) + + input := C.as_open_input(inputFormatC, inputURLC, verbose) + if input == nil { + log.Printf("Unable to open input") + C.free(unsafe.Pointer(inputFormatC)) + C.free(unsafe.Pointer(inputURLC)) + doneChan <- struct{}{} + return + } + C.free(unsafe.Pointer(inputFormatC)) + C.free(unsafe.Pointer(inputURLC)) + + outputFormat := C.CString("mp3") + outputURL := C.CString(fmt.Sprintf("pipe:%d", outPipe.Fd())) + outputEncoder := C.CString("libmp3lame") + + output := C.as_open_output(input, outputFormat, outputURL, outputEncoder) + if output == nil { + log.Printf("Unable to open output") + C.as_destroy_input(input) + C.free(unsafe.Pointer(outputFormat)) + C.free(unsafe.Pointer(outputURL)) + C.free(unsafe.Pointer(outputEncoder)) + doneChan <- struct{}{} + return + } + C.free(unsafe.Pointer(outputFormat)) + C.free(unsafe.Pointer(outputURL)) + C.free(unsafe.Pointer(outputEncoder)) + + audiostreamer := C.as_init_audiostreamer(input, output) + if audiostreamer == nil { + log.Printf("Unable to initialize audiostreamer") + C.as_destroy_output(output) + C.as_destroy_input(input) + doneChan <- struct{}{} + return + } + defer C.as_destroy_audiostreamer(audiostreamer) + + for { + select { + // If stop channel is closed then we stop what we're doing. + case <-stopChan: + log.Printf("Stopping encoder") + doneChan <- struct{}{} + return + default: + } + + frameSize := C.int(0) + res := C.as_read_write(audiostreamer, &frameSize) + if res == -1 { + log.Printf("Failure decoding/encoding") + doneChan <- struct{}{} + return + } + + // EOF. Typical usage will never have EOF. However if we run with a file as + // input then this may happen. + if res == 0 { + doneChan <- struct{}{} + return + } + + // We did some work. + + if frameSize > 0 { + frameChan <- int(frameSize) + } + } +} + +// videoEncoder opens a video input and begins decoding. +// +// It remuxes the video to an mp4 container. +// +// As it writes out frames, it informs the reader about a frame to read, along +// with that frame's size. +func videoEncoder(outPipe *os.File, inputFormat, inputURL string, + stopChan <-chan struct{}, doneChan chan<- struct{}, frameChan chan<- int) { + inputFormatC := C.CString(inputFormat) + inputURLC := C.CString(inputURL) + outputFormatC := C.CString("mp4") + outputURLC := C.CString(fmt.Sprintf("pipe:%d", outPipe.Fd())) + verbose := C.bool(true) + + vs := C.vs_open(inputFormatC, inputURLC, outputFormatC, outputURLC, verbose) + if vs == nil { + log.Printf("Unable to open input") + C.free(unsafe.Pointer(inputFormatC)) + C.free(unsafe.Pointer(inputURLC)) + C.free(unsafe.Pointer(outputFormatC)) + C.free(unsafe.Pointer(outputURLC)) + doneChan <- struct{}{} + return + } + C.free(unsafe.Pointer(inputFormatC)) + C.free(unsafe.Pointer(inputURLC)) + C.free(unsafe.Pointer(outputFormatC)) + C.free(unsafe.Pointer(outputURLC)) + defer C.vs_destroy(vs) + + frameChan <- 792 + + for { + select { + // If stop channel is closed then we stop what we're doing. + case <-stopChan: + log.Printf("Stopping encoder") + doneChan <- struct{}{} + return + default: + } + + frameSize := C.int(0) + frameSize = C.vs_read_write(vs, verbose) + if frameSize == -1 { + log.Printf("Failure decoding/encoding") + doneChan <- struct{}{} + return + } + + // We did some work. + + log.Printf("frame size %d", frameSize) + + if frameSize > 0 { + frameChan <- int(frameSize) + } + } +} + +// reader reads the pipe containing the re-encoded audio/video. +// +// We send the re-encoded data to each client. +// +// We hear about new clients on the clients channel. +// +// We expect the pipe to never close. The encoder may stop sending for a while +// but when a new client appears, it starts again. +func reader(verbose bool, inPipe *os.File, clientChan <-chan Client, + frameChan <-chan int) { + reader := bufio.NewReader(inPipe) + clients := []Client{} + + for { + select { + case client := <-clientChan: + if verbose { + log.Printf("reader: accepted new client") + } + + clients = append(clients, client) + + case frameSize := <-frameChan: + if verbose { + log.Printf("reader: reading new frame (%d bytes)", frameSize) + } + + frame, err := readFrame(reader, frameSize) + if err != nil { + log.Printf("reader: %s", err) + return + } + + if verbose { + log.Printf("reader: read frame (%d bytes)", frameSize) + } + + clients = sendFrameToClients(clients, frame) + } + } +} + +// Read a frame. +func readFrame(reader *bufio.Reader, size int) (Frame, error) { + buf := []byte{} + bytesNeeded := size + + for { + if bytesNeeded == 0 { + return Frame{Buffer: buf}, nil + } + + readBuf := make([]byte, bytesNeeded) + + n, err := reader.Read(readBuf) + if err != nil { + return Frame{}, fmt.Errorf("read: %s", err) + } + + log.Printf("read %d bytes", n) + + buf = append(buf, readBuf[0:n]...) + + bytesNeeded -= n + } +} + +// Try to send the given frame to each client. +// +// If sending would block, cut the client off. +func sendFrameToClients(clients []Client, frame Frame) []Client { + clients2 := []Client{} + + for _, client := range clients { + err := sendFrameToClient(client, frame) + if err != nil { + continue + } + + // Keep it around. + clients2 = append(clients2, client) + } + + return clients2 +} + +// Send a frame to a client. Don't block. If we would block, return an error. +// This lets us know if we should consider the client dead. +// +// Close the client's frame channel if we fail to send so it knows to go away. +func sendFrameToClient(client Client, frame Frame) error { + select { + case client.Frames <- frame: + return nil + case <-client.Done: + close(client.Frames) + return fmt.Errorf("client went away") + default: + close(client.Frames) + return fmt.Errorf("client is too slow") + } +} + +// ServeHTTP handles an HTTP request. +func (h HTTPHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) { + log.Printf("Serving [%s] request from [%s] to path [%s] (%d bytes)", + r.Method, r.RemoteAddr, r.URL.Path, r.ContentLength) + + if r.Method == "GET" && r.URL.Path == "/stream" { + h.streamRequest(rw, r) + return + } + + log.Printf("Unknown request.") + rw.WriteHeader(http.StatusNotFound) + _, _ = rw.Write([]byte("

404 Not found

")) +} + +func (h HTTPHandler) streamRequest(rw http.ResponseWriter, r *http.Request) { + c := Client{ + // We receive audio/video data on this channel from the reader. + Frames: make(chan Frame, 1024), + + // We close this channel to indicate to reader we're done. This is necessary + // if we terminate, otherwise the reader can't know to stop sending us + // frames. + Done: make(chan struct{}), + } + + // Tell the reader we're here. + h.ClientChan <- c + + // Tell the encoder we're here. + h.ClientChangeChan <- 1 + + if h.Encoder == AudioEncoder { + rw.Header().Set("Content-Type", "audio/mpeg") + } + if h.Encoder == VideoEncoder { + rw.Header().Set("Content-Type", "video/mp4") + } + + rw.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate") + + // We send chunked by default + + for { + frame, ok := <-c.Frames + + // Reader may have cut us off. + if !ok { + log.Printf("reader closed audio/video channel") + break + } + + n, err := rw.Write(frame.Buffer) + if err != nil { + log.Printf("write: %s", err) + break + } + + if n != len(frame.Buffer) { + log.Printf("short write") + break + } + + // ResponseWriter buffers chunks. Flush them out ASAP to reduce the time a + // client is waiting, especially initially. + if flusher, ok := rw.(http.Flusher); ok { + flusher.Flush() + } + + if h.Verbose { + //log.Printf("%s: Sent %d bytes to client", r.RemoteAddr, n) + } + } + + h.ClientChangeChan <- -1 + + close(c.Done) + + // Drain frames channel. + for range c.Frames { + } + + log.Printf("%s: Client cleaned up", r.RemoteAddr) +} diff --git a/videostreamer.h b/videostreamer.h new file mode 100644 index 0000000..461628e --- /dev/null +++ b/videostreamer.h @@ -0,0 +1,27 @@ +#ifndef _VIDEOSTREAMER_H +#define _VIDEOSTREAMER_H + +#include +#include + +struct Videostreamer { + AVFormatContext * input_format_ctx; + AVFormatContext * output_format_ctx; + int video_stream_index; +}; + +void +vs_setup(void); + +struct Videostreamer * +vs_open(const char * const, const char * const, + const char * const, const char * const, + const bool); + +void +vs_destroy(struct Videostreamer * const); + +int +vs_read_write(const struct Videostreamer *, const bool); + +#endif