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Copy pathFFMpegDecoder.cpp
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427 lines (374 loc) · 12.6 KB
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/*
* Copyright (c) 2016 The ZLMediaKit project authors. All Rights Reserved.
*
* This file is part of ZLMediaKit(https://github.com/ZLMediaKit/ZLMediaKit).
*
* Use of this source code is governed by MIT license that can be found in the
* LICENSE file in the root of the source tree. All contributing project authors
* may be found in the AUTHORS file in the root of the source tree.
*/
#include "FFMpegDecoder.h"
#define MAX_DELAY_SECOND 3
using namespace std;
using namespace toolkit;
using namespace mediakit;
static string ffmpeg_err(int errnum) {
char errbuf[AV_ERROR_MAX_STRING_SIZE];
av_strerror(errnum, errbuf, AV_ERROR_MAX_STRING_SIZE);
return errbuf;
}
std::shared_ptr<AVPacket> alloc_av_packet(){
auto pkt = std::shared_ptr<AVPacket>(av_packet_alloc(), [](AVPacket *pkt) {
av_packet_free(&pkt);
});
pkt->data = NULL; // packet data will be allocated by the encoder
pkt->size = 0;
return pkt;
}
//////////////////////////////////////////////////////////////////////////////////////////
template<bool decoder = true, typename ...ARGS>
const AVCodec *getCodec(ARGS ...names);
template<bool decoder = true>
const AVCodec *getCodec(const char *name) {
auto codec = decoder ? avcodec_find_decoder_by_name(name) : avcodec_find_encoder_by_name(name);
if (codec) {
InfoL << (decoder ? "got decoder:" : "got encoder:") << name;
}
return codec;
}
template<bool decoder = true>
const AVCodec *getCodec(enum AVCodecID id) {
auto codec = decoder ? avcodec_find_decoder(id) : avcodec_find_encoder(id);
if (codec) {
InfoL << (decoder ? "got decoder:" : "got encoder:") << avcodec_get_name(id);
}
return codec;
}
template<bool decoder = true, typename First, typename ...ARGS>
const AVCodec *getCodec(First first, ARGS ...names) {
auto codec = getCodec<decoder>(names...);
if (codec) {
return codec;
}
return getCodec<decoder>(first);
}
//////////////////////////////////////////////////////////////////////////////////////////
FFmpegFrame::FFmpegFrame(std::shared_ptr<AVFrame> frame) {
if (frame) {
_frame = std::move(frame);
} else {
_frame.reset(av_frame_alloc(), [](AVFrame *ptr) {
av_frame_free(&ptr);
});
}
}
FFmpegFrame::~FFmpegFrame() {
if (_data) {
delete[] _data;
_data = nullptr;
}
}
AVFrame *FFmpegFrame::get() const {
return _frame.get();
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////
FFmpegSwr::FFmpegSwr(AVSampleFormat output, int channel, int channel_layout, int samplerate) {
_target_format = output;
_target_channels = channel;
_target_channel_layout = channel_layout;
_target_samplerate = samplerate;
}
FFmpegSwr::~FFmpegSwr() {
if (_ctx) {
swr_free(&_ctx);
}
}
FFmpegFrame::Ptr FFmpegSwr::inputFrame(const FFmpegFrame::Ptr &frame) {
if (frame->get()->format == _target_format &&
frame->get()->channels == _target_channels &&
frame->get()->channel_layout == (uint64_t)_target_channel_layout &&
frame->get()->sample_rate == _target_samplerate) {
//不转格式
return frame;
}
if (!_ctx) {
_ctx = swr_alloc_set_opts(nullptr, _target_channel_layout, _target_format, _target_samplerate,
frame->get()->channel_layout, (AVSampleFormat) frame->get()->format,
frame->get()->sample_rate, 0, nullptr);
InfoL << "swr_alloc_set_opts:" << av_get_sample_fmt_name((enum AVSampleFormat) frame->get()->format) << " -> "
<< av_get_sample_fmt_name(_target_format);
}
if (_ctx) {
auto out = std::make_shared<FFmpegFrame>();
out->get()->format = _target_format;
out->get()->channel_layout = _target_channel_layout;
out->get()->channels = _target_channels;
out->get()->sample_rate = _target_samplerate;
out->get()->pkt_dts = frame->get()->pkt_dts;
out->get()->pts = frame->get()->pts;
int ret = 0;
if(0 != (ret = swr_convert_frame(_ctx, out->get(), frame->get()))){
WarnL << "swr_convert_frame failed:" << ffmpeg_err(ret);
return nullptr;
}
return out;
}
return nullptr;
}
///////////////////////////////////////////////////////////////////////////
FFmpegDecoder::FFmpegDecoder(const Track::Ptr &track) {
#if (LIBAVCODEC_VERSION_MAJOR < 58)
avcodec_register_all();
#endif
const AVCodec *codec = nullptr;
const AVCodec *codec_default = nullptr;
switch (track->getCodecId()) {
case CodecH264:
codec_default = getCodec(AV_CODEC_ID_H264);
codec = getCodec("libopenh264", AV_CODEC_ID_H264, "h264_videotoolbox", "h264_cuvid");
break;
case CodecH265:
codec_default = getCodec(AV_CODEC_ID_HEVC);
codec = getCodec(AV_CODEC_ID_HEVC, "hevc_videotoolbox", "hevc_cuvid");
break;
case CodecAAC:
codec = getCodec(AV_CODEC_ID_AAC);
break;
case CodecG711A:
codec = getCodec(AV_CODEC_ID_PCM_ALAW);
break;
case CodecG711U:
codec = getCodec(AV_CODEC_ID_PCM_MULAW);
break;
case CodecOpus:
codec = getCodec(AV_CODEC_ID_OPUS);
break;
default: break;
}
if (!codec) {
throw std::runtime_error("未找到解码器");
}
while (true) {
_context.reset(avcodec_alloc_context3(codec), [](AVCodecContext *ctx) {
avcodec_close(ctx);
avcodec_free_context(&ctx);
});
if (!_context) {
throw std::runtime_error("创建解码器失败");
}
//保存AVFrame的引用
#ifdef FF_API_OLD_ENCDEC
_context->refcounted_frames = 1;
#endif
_context->flags |= AV_CODEC_FLAG_LOW_DELAY;
_context->flags2 |= AV_CODEC_FLAG2_FAST;
switch (track->getCodecId()) {
case CodecG711A:
case CodecG711U: {
AudioTrack::Ptr audio = static_pointer_cast<AudioTrack>(track);
_context->channels = audio->getAudioChannel();
_context->sample_rate = audio->getAudioSampleRate();
_context->channel_layout = av_get_default_channel_layout(_context->channels);
break;
}
default:
break;
}
AVDictionary *dict = nullptr;
av_dict_set(&dict, "threads", "auto", 0);
av_dict_set(&dict, "zerolatency", "1", 0);
av_dict_set(&dict, "strict", "-2", 0);
if (codec->capabilities & AV_CODEC_CAP_TRUNCATED) {
/* we do not send complete frames */
_context->flags |= AV_CODEC_FLAG_TRUNCATED;
} else {
// 此时业务层应该需要合帧
_do_merger = true;
}
int ret = avcodec_open2(_context.get(), codec, &dict);
av_dict_free(&dict);
if (ret >= 0) {
//成功
InfoL << "打开解码器成功:" << codec->name;
break;
}
if (codec_default && codec_default != codec) {
//硬件编解码器打开失败，尝试软件的
WarnL << "打开解码器" << codec->name << "失败，原因是:" << ffmpeg_err(ret) << ", 再尝试打开解码器" << codec_default->name;
codec = codec_default;
continue;
}
throw std::runtime_error(StrPrinter << "打开解码器" << codec->name << "失败:" << ffmpeg_err(ret));
}
if (track->getTrackType() == TrackVideo) {
startThread("decoder thread");
}
}
FFmpegDecoder::~FFmpegDecoder() {
stopThread();
}
void FFmpegDecoder::flush() {
while (true) {
auto out_frame = std::make_shared<FFmpegFrame>();
auto ret = avcodec_receive_frame(_context.get(), out_frame->get());
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
break;
}
if (ret < 0) {
WarnL << "avcodec_receive_frame failed:" << ffmpeg_err(ret);
break;
}
onDecode(out_frame);
}
}
const AVCodecContext *FFmpegDecoder::getContext() const {
return _context.get();
}
bool FFmpegDecoder::inputFrame_l(const Frame::Ptr &frame) {
if (_do_merger) {
return _merger.inputFrame(frame, [&](uint32_t dts, uint32_t pts, const Buffer::Ptr &buffer, bool have_idr) {
decodeFrame(buffer->data(), buffer->size(), dts, pts);
});
}
return decodeFrame(frame->data(), frame->size(), frame->dts(), frame->pts());
}
bool FFmpegDecoder::inputFrame(const Frame::Ptr &frame, bool may_async) {
if (!may_async || !TaskManager::isEnabled()) {
return inputFrame_l(frame);
}
auto frame_cache = Frame::getCacheAbleFrame(frame);
addDecodeTask(frame->keyFrame(), [this, frame_cache]() {
inputFrame_l(frame_cache);
//此处模拟解码太慢导致的主动丢帧
//usleep(100 * 1000);
});
return true;
}
bool FFmpegDecoder::decodeFrame(const char *data, size_t size, uint32_t dts, uint32_t pts) {
TimeTicker2(30, TraceL);
auto pkt = alloc_av_packet();
pkt->data = (uint8_t *) data;
pkt->size = size;
pkt->dts = dts;
pkt->pts = pts;
auto ret = avcodec_send_packet(_context.get(), pkt.get());
if (ret < 0) {
if (ret != AVERROR_INVALIDDATA) {
WarnL << "avcodec_send_packet failed:" << ffmpeg_err(ret);
}
return false;
}
while (true) {
auto out_frame = std::make_shared<FFmpegFrame>();
ret = avcodec_receive_frame(_context.get(), out_frame->get());
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
break;
}
if (ret < 0) {
WarnL << "avcodec_receive_frame failed:" << ffmpeg_err(ret);
break;
}
if (pts - out_frame->get()->pts > MAX_DELAY_SECOND * 1000 && _ticker.createdTime() > 10 * 1000) {
//后面的帧才忽略,防止Track无法ready
WarnL << "解码时，忽略" << MAX_DELAY_SECOND << "秒前的数据:" << pts << " " << out_frame->get()->pts;
continue;
}
onDecode(out_frame);
}
return true;
}
void FFmpegDecoder::setOnDecode(FFmpegDecoder::onDec cb) {
_cb = std::move(cb);
}
void FFmpegDecoder::onDecode(const FFmpegFrame::Ptr &frame) {
if (_cb) {
_cb(frame);
}
}
////////////////////////////////////////////////////////////////////////
void TaskManager::pushExit(){
{
lock_guard<mutex> lck(_task_mtx);
_exit = true;
_task.clear();
_task.emplace_back([](){
throw ThreadExitException();
});
}
_sem.post(10);
}
void TaskManager::addEncodeTask(function<void()> task) {
{
lock_guard<mutex> lck(_task_mtx);
_task.emplace_back(std::move(task));
if (_task.size() > 30) {
WarnL << "encoder thread task is too more, now drop frame!";
_task.pop_front();
}
}
_sem.post();
}
void TaskManager::addDecodeTask(bool key_frame, function<void()> task) {
{
lock_guard<mutex> lck(_task_mtx);
if (_decode_drop_start) {
if (!key_frame) {
TraceL << "decode thread drop frame";
return;
}
_decode_drop_start = false;
InfoL << "decode thread stop drop frame";
}
_task.emplace_back(std::move(task));
if (_task.size() > 30) {
_decode_drop_start = true;
WarnL << "decode thread start drop frame";
}
}
_sem.post();
}
void TaskManager::startThread(const string &name) {
_thread.reset(new thread([this, name]() {
onThreadRun(name);
}), [this](thread *ptr) {
pushExit();
ptr->join();
delete ptr;
});
}
void TaskManager::stopThread() {
_thread = nullptr;
}
TaskManager::~TaskManager() {
stopThread();
}
bool TaskManager::isEnabled() const {
return _thread.operator bool();
}
void TaskManager::onThreadRun(const string &name) {
setThreadName(name.data());
function<void()> task;
_exit = false;
while (!_exit) {
_sem.wait();
{
unique_lock<mutex> lck(_task_mtx);
if (_task.empty()) {
continue;
}
task = _task.front();
_task.pop_front();
}
try {
TimeTicker2(50, TraceL);
task();
task = nullptr;
} catch (ThreadExitException &ex) {
break;
} catch (std::exception &ex) {
WarnL << ex.what();
continue;
}
}
InfoL << name << " exited!";
}