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ffmpeg: Misc fixes 

The most important one being adding a mutex to protect the format_context. Apparently it wasn't thread safe (as one'd expect) but I didn't think about that.

Should fix some of the strange issues happening with MP4 muxers, etc.
This commit is contained in:
zhupengfei 2020-03-21 12:02:21 +08:00
parent a50ba7192b
commit 22bfa7b5de
No known key found for this signature in database
GPG Key ID: DD129E108BD09378
2 changed files with 41 additions and 24 deletions
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52
src/core/dumping/ffmpeg_backend.cpp
View File

@ -44,10 +44,12 @@ FFmpegStream::~FFmpegStream() {
Free();
}
bool FFmpegStream::Init(AVFormatContext* format_context_) {
bool FFmpegStream::Init(FFmpegMuxer& muxer) {
InitializeFFmpegLibraries();
format_context = format_context_;
format_context = muxer.format_context.get();
format_context_mutex = &muxer.format_context_mutex;
return true;
}
@ -60,14 +62,12 @@ void FFmpegStream::Flush() {
}
void FFmpegStream::WritePacket(AVPacket& packet) {
if (packet.pts != static_cast<s64>(AV_NOPTS_VALUE)) {
packet.pts = av_rescale_q(packet.pts, codec_context->time_base, stream->time_base);
}
if (packet.dts != static_cast<s64>(AV_NOPTS_VALUE)) {
packet.dts = av_rescale_q(packet.dts, codec_context->time_base, stream->time_base);
}
av_packet_rescale_ts(&packet, codec_context->time_base, stream->time_base);
packet.stream_index = stream->index;
av_interleaved_write_frame(format_context, &packet);
{
std::lock_guard lock{*format_context_mutex};
av_interleaved_write_frame(format_context, &packet);
}
}
void FFmpegStream::SendFrame(AVFrame* frame) {
@ -101,12 +101,11 @@ FFmpegVideoStream::~FFmpegVideoStream() {
Free();
}
bool FFmpegVideoStream::Init(AVFormatContext* format_context, AVOutputFormat* output_format,
const Layout::FramebufferLayout& layout_) {
bool FFmpegVideoStream::Init(FFmpegMuxer& muxer, const Layout::FramebufferLayout& layout_) {
InitializeFFmpegLibraries();
if (!FFmpegStream::Init(format_context))
if (!FFmpegStream::Init(muxer))
return false;
layout = layout_;
@ -129,7 +128,7 @@ bool FFmpegVideoStream::Init(AVFormatContext* format_context, AVOutputFormat* ou
codec_context->time_base.den = 60;
codec_context->gop_size = 12;
codec_context->pix_fmt = codec->pix_fmts ? codec->pix_fmts[0] : AV_PIX_FMT_YUV420P;
if (output_format->flags & AVFMT_GLOBALHEADER)
if (format_context->oformat->flags & AVFMT_GLOBALHEADER)
codec_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
AVDictionary* options = ToAVDictionary(Settings::values.video_encoder_options);
@ -157,7 +156,7 @@ bool FFmpegVideoStream::Init(AVFormatContext* format_context, AVOutputFormat* ou
scaled_frame->format = codec_context->pix_fmt;
scaled_frame->width = layout.width;
scaled_frame->height = layout.height;
if (av_frame_get_buffer(scaled_frame.get(), 1) < 0) {
if (av_frame_get_buffer(scaled_frame.get(), 0) < 0) {
LOG_ERROR(Render, "Could not allocate frame buffer");
return false;
}
@ -193,6 +192,10 @@ void FFmpegVideoStream::ProcessFrame(VideoFrame& frame) {
current_frame->height = layout.height;
// Scale the frame
if (av_frame_make_writable(scaled_frame.get()) < 0) {
LOG_ERROR(Render, "Video frame dropped: Could not prepare frame");
return;
}
if (sws_context) {
sws_scale(sws_context.get(), current_frame->data, current_frame->linesize, 0, layout.height,
scaled_frame->data, scaled_frame->linesize);
@ -207,10 +210,10 @@ FFmpegAudioStream::~FFmpegAudioStream() {
Free();
}
bool FFmpegAudioStream::Init(AVFormatContext* format_context) {
bool FFmpegAudioStream::Init(FFmpegMuxer& muxer) {
InitializeFFmpegLibraries();
if (!FFmpegStream::Init(format_context))
if (!FFmpegStream::Init(muxer))
return false;
frame_count = 0;
@ -246,8 +249,12 @@ bool FFmpegAudioStream::Init(AVFormatContext* format_context) {
} else {
codec_context->sample_rate = AudioCore::native_sample_rate;
}
codec_context->time_base.num = 1;
codec_context->time_base.den = codec_context->sample_rate;
codec_context->channel_layout = AV_CH_LAYOUT_STEREO;
codec_context->channels = 2;
if (format_context->oformat->flags & AVFMT_GLOBALHEADER)
codec_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
AVDictionary* options = ToAVDictionary(Settings::values.audio_encoder_options);
if (avcodec_open2(codec_context.get(), codec, &options) < 0) {
@ -280,6 +287,7 @@ bool FFmpegAudioStream::Init(AVFormatContext* format_context) {
audio_frame->format = codec_context->sample_fmt;
audio_frame->channel_layout = codec_context->channel_layout;
audio_frame->channels = codec_context->channels;
audio_frame->sample_rate = codec_context->sample_rate;
// Allocate SWR context
auto* context =
@ -418,9 +426,9 @@ bool FFmpegMuxer::Init(const std::string& path, const Layout::FramebufferLayout&
}
format_context.reset(format_context_raw);
if (!video_stream.Init(format_context.get(), output_format, layout))
if (!video_stream.Init(*this, layout))
return false;
if (!audio_stream.Init(format_context.get()))
if (!audio_stream.Init(*this))
return false;
AVDictionary* options = ToAVDictionary(Settings::values.format_options);
@ -465,6 +473,8 @@ void FFmpegMuxer::FlushAudio() {
}
void FFmpegMuxer::WriteTrailer() {
std::lock_guard lock{format_context_mutex};
av_interleaved_write_frame(format_context.get(), nullptr);
av_write_trailer(format_context.get());
}
@ -553,11 +563,13 @@ void FFmpegBackend::AddAudioFrame(AudioCore::StereoFrame16 frame) {
refactored_frame[1][i] = frame[i][1];
}
ffmpeg.ProcessAudioFrame(refactored_frame[0], refactored_frame[1]);
audio_frame_queues[0].Push(std::move(refactored_frame[0]));
audio_frame_queues[1].Push(std::move(refactored_frame[1]));
}
void FFmpegBackend::AddAudioSample(const std::array<s16, 2>& sample) {
ffmpeg.ProcessAudioFrame({sample[0]}, {sample[1]});
audio_frame_queues[0].Push(VariableAudioFrame{sample[0]});
audio_frame_queues[1].Push(VariableAudioFrame{sample[1]});
}
void FFmpegBackend::StopDumping() {

13
src/core/dumping/ffmpeg_backend.h
View File

@ -31,13 +31,15 @@ using VariableAudioFrame = std::vector<s16>;
void InitFFmpegLibraries();
class FFmpegMuxer;
/**
* Wrapper around FFmpeg AVCodecContext + AVStream.
* Rescales/Resamples, encodes and writes a frame.
*/
class FFmpegStream {
public:
bool Init(AVFormatContext* format_context);
bool Init(FFmpegMuxer& muxer);
void Free();
void Flush();
@ -60,6 +62,7 @@ protected:
};
AVFormatContext* format_context{};
std::mutex* format_context_mutex{};
std::unique_ptr<AVCodecContext, AVCodecContextDeleter> codec_context{};
AVStream* stream{};
};
@ -72,8 +75,7 @@ class FFmpegVideoStream : public FFmpegStream {
public:
~FFmpegVideoStream();
bool Init(AVFormatContext* format_context, AVOutputFormat* output_format,
const Layout::FramebufferLayout& layout);
bool Init(FFmpegMuxer& muxer, const Layout::FramebufferLayout& layout);
void Free();
void ProcessFrame(VideoFrame& frame);
@ -104,7 +106,7 @@ class FFmpegAudioStream : public FFmpegStream {
public:
~FFmpegAudioStream();
bool Init(AVFormatContext* format_context);
bool Init(FFmpegMuxer& muxer);
void Free();
void ProcessFrame(const VariableAudioFrame& channel0, const VariableAudioFrame& channel1);
void Flush();
@ -153,6 +155,9 @@ private:
FFmpegAudioStream audio_stream{};
FFmpegVideoStream video_stream{};
std::unique_ptr<AVFormatContext, AVFormatContextDeleter> format_context{};
std::mutex format_context_mutex;
friend class FFmpegStream;
};
/**