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/**
* @file
* @author 2012-2013 Stefan Radomski (stefan.radomski@cs.tu-darmstadt.de)
* @copyright Simplified BSD
*
* @cond
* This program is free software: you can redistribute it and/or modify
* it under the terms of the FreeBSD license as published by the FreeBSD
* project.
*
* This program 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.
*
* You should have received a copy of the FreeBSD license along with this
* program. If not, see <http://www.opensource.org/licenses/bsd-license>.
* @endcond
*/
#include <boost/algorithm/string.hpp>
#include "FFMPEGInvoker.h"
#include "uscxml/messages/Blob.h"
#include <glog/logging.h>
#include <libavutil/imgutils.h>
#include <libavcodec/avcodec.h>
#include <fstream>
#ifdef BUILD_AS_PLUGINS
#include <Pluma/Connector.hpp>
#endif
#define STREAM_FRAME_RATE 25 /* 25 images/s */
#define BMP_FORMAT PIX_FMT_BGR24
namespace uscxml {
#ifdef BUILD_AS_PLUGINS
PLUMA_CONNECTOR
bool pluginConnect(pluma::Host& host) {
host.add( new FFMPEGInvokerProvider() );
return true;
}
#endif
FFMPEGInvoker::FFMPEGInvoker() {
}
FFMPEGInvoker::~FFMPEGInvoker() {
};
boost::shared_ptr<InvokerImpl> FFMPEGInvoker::create(InterpreterImpl* interpreter) {
boost::shared_ptr<FFMPEGInvoker> invoker = boost::shared_ptr<FFMPEGInvoker>(new FFMPEGInvoker());
// Register all formats and codecs - this ought to be done just once
av_register_all();
return invoker;
}
Data FFMPEGInvoker::getDataModelVariables() {
Data data;
AVCodec* codec = NULL;
while((codec = av_codec_next(codec))) {
AVCodec* codecInst = avcodec_find_encoder(codec->id);
if (!codecInst)
continue;
switch (codec->type) {
case AVMEDIA_TYPE_VIDEO: {
Data codecData;
codecData.compound["name"] = Data(codec->name, Data::VERBATIM);
codecData.compound["longName"] = Data(codec->long_name, Data::VERBATIM);
data.compound["video"].compound[codec->name] = codecData;
break;
}
case AVMEDIA_TYPE_AUDIO: {
Data codecData;
codecData.compound["name"] = Data(codec->name, Data::VERBATIM);
codecData.compound["longName"] = Data(codec->long_name, Data::VERBATIM);
data.compound["audio"].compound[codec->name] = codecData;
break;
}
default:
break;
}
}
return data;
}
void FFMPEGInvoker::invoke(const InvokeRequest& req) {
int nrThreads = 1;
Event::getParam(req.params, "threads", nrThreads);
_isRunning = true;
for (size_t i = 0; i < nrThreads; i++) {
_threads.insert(new tthread::thread(FFMPEGInvoker::run, this));
}
}
void FFMPEGInvoker::send(const SendRequest& req) {
SendRequest reqCopy = req;
if (iequals(req.name, "render.start")) {
// create a new encoding context
int ret;
EncodingContext* ctx = new EncodingContext();
tthread::lock_guard<tthread::recursive_mutex> lock(ctx->mutex);
std::string context;
Event::getParam(req.params, "context", context);
ctx->extension = "mpeg";
Event::getParam(req.params, "format", ctx->extension);
Event::getParam(req.params, "width", ctx->width);
Event::getParam(req.params, "height", ctx->height);
if (!ctx->width || !ctx->height)
return;
ctx->filename = URL::getTmpFilename();
/* allocate the output media context */
avformat_alloc_output_context2(&ctx->formatCtx, NULL, ctx->extension.c_str(), ctx->filename.c_str());
if (!ctx->formatCtx) {
printf("Could not deduce output format from file extension: using MPEG.\n");
avformat_alloc_output_context2(&ctx->formatCtx, NULL, "mpeg", ctx->filename.c_str());
}
if (!ctx->formatCtx) {
return;
}
ctx->format = ctx->formatCtx->oformat;
/* Add the audio and video streams using the default format codecs
* and initialize the codecs. */
ctx->videoStream = NULL;
if (ctx->format->video_codec != AV_CODEC_ID_NONE) {
ctx->videoStream = addStream(ctx, ctx->formatCtx, &ctx->videoCodec, ctx->format->video_codec);
}
/* Now that all the parameters are set, we can open the audio and
* video codecs and allocate the necessary encode buffers. */
if (ctx->videoStream)
openVideo(ctx, ctx->formatCtx, ctx->videoCodec, ctx->videoStream);
/* open the output file, if needed */
if (!(ctx->format->flags & AVFMT_NOFILE)) {
ret = avio_open(&ctx->formatCtx->pb, ctx->filename.c_str(), AVIO_FLAG_WRITE);
if (ret < 0) {
// fprintf(stderr, "Could not open '%s': %s\n", ctx->filename.c_str(),
// av_err2str(ret));
return;
}
}
/* Write the stream header, if any. */
ret = avformat_write_header(ctx->formatCtx, NULL);
if (ret < 0) {
// fprintf(stderr, "Error occurred when opening output file: %s\n",
// av_err2str(ret));
return;
}
if (ctx->frame)
ctx->frame->pts = 0;
_encoders[context] = ctx;
} else if(iequals(req.name, "render.frame")) {
_workQueue.push(req);
} else if(iequals(req.name, "render.end")) {
_workQueue.push(req);
}
}
void FFMPEGInvoker::cancel(const std::string sendId) {
}
void FFMPEGInvoker::run(void* instance) {
FFMPEGInvoker* INSTANCE = (FFMPEGInvoker*)instance;
while(true) {
SendRequest req = INSTANCE->_workQueue.pop();
if (INSTANCE->_isRunning) {
INSTANCE->process(req);
} else {
return;
}
}
}
void FFMPEGInvoker::finish(EncodingContext* ctx, const SendRequest& req) {
av_write_trailer(ctx->formatCtx);
/* Close each codec. */
if (ctx->videoStream)
closeVideo(ctx, ctx->formatCtx, ctx->videoStream);
if (!(ctx->formatCtx->oformat->flags & AVFMT_NOFILE))
/* Close the output file. */
avio_close(ctx->formatCtx->pb);
/* free the stream */
avformat_free_context(ctx->formatCtx);
// read file
std::ifstream movieFile(ctx->filename.c_str());
movieFile.seekg(0, std::ios::end);
size_t length = movieFile.tellg();
movieFile.seekg(0, std::ios::beg);
char* movieBuffer = (char*)malloc(length);
movieFile.read(movieBuffer, length);
// move to desktop for checking
// int err = rename(ctx->filename.c_str(), "/Users/sradomski/Desktop/foo.mpg");
// if (err) {
// printf("%s", strerror(errno));
// }
std::string context;
Event::getParam(req.params, "context", context);
Event event;
event.name = "render.done";
event.data.compound["context"] = Data(context, Data::INTERPRETED);
event.data.compound["movie"] = Data(movieBuffer, length, "video/mpeg", true);
event.data.compound["filename"] = Data(std::string("movie.") + ctx->extension, Data::VERBATIM);
returnEvent(event);
}
void FFMPEGInvoker::process(const SendRequest& req) {
std::string context;
Event::getParam(req.params, "context", context);
if (_encoders.find(context) == _encoders.end()) {
return;
}
EncodingContext* ctx = _encoders[context];
tthread::lock_guard<tthread::recursive_mutex> lock(ctx->mutex);
// finish encoding and return
if(iequals(req.name, "render.end")) {
finish(ctx, req);
delete _encoders[context];
_encoders.erase(context);
}
Data image;
Event::getParam(req.params, "frame", image);
if (image.empty()) {
return;
}
std::string format = "bmp";
Event::getParam(req.params, "format", format);
writeVideoFrame(ctx, ctx->formatCtx, ctx->videoStream, image.binary);
ctx->frame->pts += av_rescale_q(1, ctx->videoStream->codec->time_base, ctx->videoStream->time_base);
}
AVStream* FFMPEGInvoker::addStream(EncodingContext* ctx, AVFormatContext *oc, AVCodec **codec,
enum AVCodecID codec_id) {
AVCodecContext *c;
AVStream *st;
/* find the encoder */
*codec = avcodec_find_encoder(codec_id);
if (!(*codec)) {
fprintf(stderr, "Could not find encoder for '%s'\n",
avcodec_get_name(codec_id));
return NULL;
}
st = avformat_new_stream(oc, *codec);
ctx->videoPixFmt = (*codec)->pix_fmts[0];
if (!st) {
fprintf(stderr, "Could not allocate stream\n");
return NULL;
}
st->id = oc->nb_streams-1;
c = st->codec;
switch ((*codec)->type) {
case AVMEDIA_TYPE_AUDIO:
c->sample_fmt = AV_SAMPLE_FMT_FLTP;
c->bit_rate = 64000;
c->sample_rate = 44100;
c->channels = 2;
break;
case AVMEDIA_TYPE_VIDEO:
c->codec_id = codec_id;
c->bit_rate = 800000;
/* Resolution must be a multiple of two. */
c->width = ctx->width;
c->height = ctx->height;
/* timebase: This is the fundamental unit of time (in seconds) in terms
* of which frame timestamps are represented. For fixed-fps content,
* timebase should be 1/framerate and timestamp increments should be
* identical to 1. */
c->time_base.den = STREAM_FRAME_RATE;
c->time_base.num = 1;
c->gop_size = 12; /* emit one intra frame every twelve frames at most */
c->pix_fmt = ctx->videoPixFmt;
if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
/* just for testing, we also add B frames */
c->max_b_frames = 2;
}
if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
/* Needed to avoid using macroblocks in which some coeffs overflow.
* This does not happen with normal video, it just happens here as
* the motion of the chroma plane does not match the luma plane. */
c->mb_decision = 2;
}
break;
default:
break;
}
/* Some formats want stream headers to be separate. */
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
return st;
}
void FFMPEGInvoker::openVideo(EncodingContext* ctx, AVFormatContext *oc, AVCodec *codec, AVStream *st) {
int ret;
AVCodecContext *c = st->codec;
/* open the codec */
ret = avcodec_open2(c, codec, NULL);
if (ret < 0) {
// fprintf(stderr, "Could not open video codec: %s\n", av_err2str(ret));
return;
}
/* allocate and init a re-usable frame */
ctx->frame = avcodec_alloc_frame();
if (!ctx->frame) {
fprintf(stderr, "Could not allocate video frame\n");
return;
}
/* Allocate the encoded raw picture. */
ret = avpicture_alloc(&ctx->dst_picture, c->pix_fmt, c->width, c->height);
if (ret < 0) {
// fprintf(stderr, "Could not allocate picture: %s\n", av_err2str(ret));
return;
}
/* If the output format is not YUV420P, then a temporary YUV420P
* picture is needed too. It is then converted to the required
* output format. */
if (c->pix_fmt != BMP_FORMAT) {
ret = avpicture_alloc(&ctx->src_picture, BMP_FORMAT, c->width, c->height);
if (ret < 0) {
// fprintf(stderr, "Could not allocate temporary picture: %s\n",
// av_err2str(ret));
return;
}
}
/* copy data and linesize picture pointers to frame */
*((AVPicture *)ctx->frame) = ctx->dst_picture;
}
void FFMPEGInvoker::writeVideoFrame(EncodingContext* ctx, AVFormatContext *oc, AVStream *st, Blob image) {
int ret;
AVCodecContext *c = st->codec;
if (c->pix_fmt != BMP_FORMAT) {
/* as we only generate a YUV420P picture, we must convert it
* to the codec pixel format if needed */
if (!ctx->sws_ctx) {
ctx->sws_ctx = sws_getContext(c->width, c->height, BMP_FORMAT,
c->width, c->height, c->pix_fmt,
ctx->sws_flags, NULL, NULL, NULL);
if (!ctx->sws_ctx) {
fprintf(stderr,
"Could not initialize the conversion context\n");
return;
}
}
uint32_t headerOffset = 0;
headerOffset += image._impl->data[10] << 0;
headerOffset += image._impl->data[11] << 8;
headerOffset += image._impl->data[12] << 16;
headerOffset += image._impl->data[13] << 24;
// std::cout << headerOffset + (c->width * c->height) << " / " << image->_size << std::endl;
ret = avpicture_fill(&ctx->src_picture, (uint8_t*)(image._impl->data + headerOffset), BMP_FORMAT, c->width, c->height);
if (ret < 0) {
fprintf(stderr,
"Could not fill image from given bitmap\n");
}
sws_scale(ctx->sws_ctx,
(const uint8_t * const *)ctx->src_picture.data, ctx->src_picture.linesize,
0, c->height, ctx->dst_picture.data, ctx->dst_picture.linesize);
} else {
avpicture_fill(&ctx->dst_picture, (uint8_t*)image._impl->data, c->pix_fmt, c->width, c->height);
}
if (oc->oformat->flags & AVFMT_RAWPICTURE) {
/* Raw video case - directly store the picture in the packet */
AVPacket pkt;
av_init_packet(&pkt);
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.stream_index = st->index;
pkt.data = ctx->dst_picture.data[0];
pkt.size = sizeof(AVPicture);
ret = av_interleaved_write_frame(oc, &pkt);
} else {
AVPacket pkt = { 0 };
int got_packet;
av_init_packet(&pkt);
/* encode the image */
ret = avcodec_encode_video2(c, &pkt, ctx->frame, &got_packet);
if (ret < 0) {
// fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
return;
}
/* If size is zero, it means the image was buffered. */
if (!ret && got_packet && pkt.size) {
pkt.stream_index = st->index;
/* Write the compressed frame to the media file. */
// ret = av_write_frame(oc, &pkt);
ret = av_interleaved_write_frame(oc, &pkt);
} else {
ret = 0;
}
}
if (ret != 0) {
// fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));
return;
}
ctx->frame_count++;
}
void FFMPEGInvoker::closeVideo(EncodingContext* ctx, AVFormatContext *oc, AVStream *st) {
avcodec_close(st->codec);
// av_free(ctx->src_picture.data[0]);
av_free(ctx->dst_picture.data[0]);
av_free(ctx->frame);
}
}
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