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FFmpegWriter.cpp
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FFmpegWriter.cpp
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/**
* @file
* @brief Source file for FFmpegWriter class
* @author Jonathan Thomas <jonathan@openshot.org>, Fabrice Bellard
*
* @ref License
*/
/* LICENSE
*
* Copyright (c) 2008-2019 OpenShot Studios, LLC, Fabrice Bellard
* (http://www.openshotstudios.com). This file is part of
* OpenShot Library (http://www.openshot.org), an open-source project
* dedicated to delivering high quality video editing and animation solutions
* to the world.
*
* This file is originally based on the Libavformat API example, and then modified
* by the libopenshot project.
*
* OpenShot Library (libopenshot) is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* OpenShot Library (libopenshot) 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. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "FFmpegWriter.h"
#include "Exceptions.h"
#include <iostream>
using namespace openshot;
// Multiplexer parameters temporary storage
AVDictionary *mux_dict = NULL;
#if USE_HW_ACCEL
int hw_en_on = 1; // Is set in UI
int hw_en_supported = 0; // Is set by FFmpegWriter
AVPixelFormat hw_en_av_pix_fmt = AV_PIX_FMT_NONE;
AVHWDeviceType hw_en_av_device_type = AV_HWDEVICE_TYPE_VAAPI;
static AVBufferRef *hw_device_ctx = NULL;
AVFrame *hw_frame = NULL;
static int set_hwframe_ctx(AVCodecContext *ctx, AVBufferRef *hw_device_ctx, int64_t width, int64_t height)
{
AVBufferRef *hw_frames_ref;
AVHWFramesContext *frames_ctx = NULL;
int err = 0;
if (!(hw_frames_ref = av_hwframe_ctx_alloc(hw_device_ctx))) {
std::clog << "Failed to create HW frame context.\n";
return -1;
}
frames_ctx = (AVHWFramesContext *)(hw_frames_ref->data);
frames_ctx->format = hw_en_av_pix_fmt;
frames_ctx->sw_format = AV_PIX_FMT_NV12;
frames_ctx->width = width;
frames_ctx->height = height;
frames_ctx->initial_pool_size = 20;
if ((err = av_hwframe_ctx_init(hw_frames_ref)) < 0) {
std::clog << "Failed to initialize HW frame context. " <<
"Error code: " << av_err2str(err) << "\n";
av_buffer_unref(&hw_frames_ref);
return err;
}
ctx->hw_frames_ctx = av_buffer_ref(hw_frames_ref);
if (!ctx->hw_frames_ctx)
err = AVERROR(ENOMEM);
av_buffer_unref(&hw_frames_ref);
return err;
}
#endif // USE_HW_ACCEL
FFmpegWriter::FFmpegWriter(const std::string& path) :
path(path), fmt(NULL), oc(NULL), audio_st(NULL), video_st(NULL), samples(NULL),
audio_outbuf(NULL), audio_outbuf_size(0), audio_input_frame_size(0), audio_input_position(0),
initial_audio_input_frame_size(0), img_convert_ctx(NULL), cache_size(8), num_of_rescalers(32),
rescaler_position(0), video_codec_ctx(NULL), audio_codec_ctx(NULL), is_writing(false), write_video_count(0), write_audio_count(0),
original_sample_rate(0), original_channels(0), avr(NULL), avr_planar(NULL), is_open(false), prepare_streams(false),
write_header(false), write_trailer(false), audio_encoder_buffer_size(0), audio_encoder_buffer(NULL) {
// Disable audio & video (so they can be independently enabled)
info.has_audio = false;
info.has_video = false;
// Init timestamps
write_video_count = 0;
write_audio_count = 0;
// Initialize FFMpeg, and register all formats and codecs
AV_REGISTER_ALL
// auto detect format
auto_detect_format();
}
// Open the writer
void FFmpegWriter::Open() {
if (!is_open) {
// Open the writer
is_open = true;
// Prepare streams (if needed)
if (!prepare_streams)
PrepareStreams();
// Now that all the parameters are set, we can open the audio and video codecs and allocate the necessary encode buffers
if (info.has_video && video_st)
open_video(oc, video_st);
if (info.has_audio && audio_st)
open_audio(oc, audio_st);
// Write header (if needed)
if (!write_header)
WriteHeader();
}
}
// auto detect format (from path)
void FFmpegWriter::auto_detect_format() {
// Auto detect the output format from the name. default is mpeg.
fmt = av_guess_format(NULL, path.c_str(), NULL);
if (!fmt)
throw InvalidFormat("Could not deduce output format from file extension.", path);
// Allocate the output media context
AV_OUTPUT_CONTEXT(&oc, path.c_str());
if (!oc)
throw OutOfMemory("Could not allocate memory for AVFormatContext.", path);
// Set the AVOutputFormat for the current AVFormatContext
oc->oformat = fmt;
// Update codec names
if (fmt->video_codec != AV_CODEC_ID_NONE && info.has_video)
// Update video codec name
info.vcodec = avcodec_find_encoder(fmt->video_codec)->name;
if (fmt->audio_codec != AV_CODEC_ID_NONE && info.has_audio)
// Update audio codec name
info.acodec = avcodec_find_encoder(fmt->audio_codec)->name;
}
// initialize streams
void FFmpegWriter::initialize_streams() {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::initialize_streams", "fmt->video_codec", fmt->video_codec, "fmt->audio_codec", fmt->audio_codec, "AV_CODEC_ID_NONE", AV_CODEC_ID_NONE);
// Add the audio and video streams using the default format codecs and initialize the codecs
video_st = NULL;
audio_st = NULL;
if (fmt->video_codec != AV_CODEC_ID_NONE && info.has_video)
// Add video stream
video_st = add_video_stream();
if (fmt->audio_codec != AV_CODEC_ID_NONE && info.has_audio)
// Add audio stream
audio_st = add_audio_stream();
}
// Set video export options
void FFmpegWriter::SetVideoOptions(bool has_video, std::string codec, Fraction fps, int width, int height, Fraction pixel_ratio, bool interlaced, bool top_field_first, int bit_rate) {
// Set the video options
if (codec.length() > 0) {
AVCodec *new_codec;
// Check if the codec selected is a hardware accelerated codec
#if USE_HW_ACCEL
#if defined(__linux__)
if (strstr(codec.c_str(), "_vaapi") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_VAAPI;
hw_en_av_device_type = AV_HWDEVICE_TYPE_VAAPI;
} else if (strstr(codec.c_str(), "_nvenc") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_CUDA;
hw_en_av_device_type = AV_HWDEVICE_TYPE_CUDA;
} else {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 0;
hw_en_supported = 0;
}
#elif defined(_WIN32)
if (strstr(codec.c_str(), "_dxva2") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_DXVA2_VLD;
hw_en_av_device_type = AV_HWDEVICE_TYPE_DXVA2;
} else if (strstr(codec.c_str(), "_nvenc") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_CUDA;
hw_en_av_device_type = AV_HWDEVICE_TYPE_CUDA;
} else {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 0;
hw_en_supported = 0;
}
#elif defined(__APPLE__)
if (strstr(codec.c_str(), "_videotoolbox") != NULL) {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 1;
hw_en_supported = 1;
hw_en_av_pix_fmt = AV_PIX_FMT_VIDEOTOOLBOX;
hw_en_av_device_type = AV_HWDEVICE_TYPE_VIDEOTOOLBOX;
} else {
new_codec = avcodec_find_encoder_by_name(codec.c_str());
hw_en_on = 0;
hw_en_supported = 0;
}
#else // unknown OS
new_codec = avcodec_find_encoder_by_name(codec.c_str());
#endif //__linux__/_WIN32/__APPLE__
#else // USE_HW_ACCEL
new_codec = avcodec_find_encoder_by_name(codec.c_str());
#endif // USE_HW_ACCEL
if (new_codec == NULL)
throw InvalidCodec("A valid video codec could not be found for this file.", path);
else {
// Set video codec
info.vcodec = new_codec->name;
// Update video codec in fmt
fmt->video_codec = new_codec->id;
}
}
if (fps.num > 0) {
// Set frames per second (if provided)
info.fps.num = fps.num;
info.fps.den = fps.den;
// Set the timebase (inverse of fps)
info.video_timebase.num = info.fps.den;
info.video_timebase.den = info.fps.num;
}
if (width >= 1)
info.width = width;
if (height >= 1)
info.height = height;
if (pixel_ratio.num > 0) {
info.pixel_ratio.num = pixel_ratio.num;
info.pixel_ratio.den = pixel_ratio.den;
}
if (bit_rate >= 1000) // bit_rate is the bitrate in b/s
info.video_bit_rate = bit_rate;
if ((bit_rate >= 0) && (bit_rate < 256)) // bit_rate is the bitrate in crf
info.video_bit_rate = bit_rate;
info.interlaced_frame = interlaced;
info.top_field_first = top_field_first;
// Calculate the DAR (display aspect ratio)
Fraction size(info.width * info.pixel_ratio.num, info.height * info.pixel_ratio.den);
// Reduce size fraction
size.Reduce();
// Set the ratio based on the reduced fraction
info.display_ratio.num = size.num;
info.display_ratio.den = size.den;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::SetVideoOptions (" + codec + ")", "width", width, "height", height, "size.num", size.num, "size.den", size.den, "fps.num", fps.num, "fps.den", fps.den);
// Enable / Disable video
info.has_video = has_video;
}
// Set video export options (overloaded function)
void FFmpegWriter::SetVideoOptions(std::string codec, int width, int height, Fraction fps, int bit_rate) {
// Call full signature with some default parameters
FFmpegWriter::SetVideoOptions(
true, codec, fps, width, height,
openshot::Fraction(1, 1), false, true, bit_rate
);
}
// Set audio export options
void FFmpegWriter::SetAudioOptions(bool has_audio, std::string codec, int sample_rate, int channels, ChannelLayout channel_layout, int bit_rate) {
// Set audio options
if (codec.length() > 0) {
AVCodec *new_codec = avcodec_find_encoder_by_name(codec.c_str());
if (new_codec == NULL)
throw InvalidCodec("A valid audio codec could not be found for this file.", path);
else {
// Set audio codec
info.acodec = new_codec->name;
// Update audio codec in fmt
fmt->audio_codec = new_codec->id;
}
}
if (sample_rate > 7999)
info.sample_rate = sample_rate;
if (channels > 0)
info.channels = channels;
if (bit_rate > 999)
info.audio_bit_rate = bit_rate;
info.channel_layout = channel_layout;
// init resample options (if zero)
if (original_sample_rate == 0)
original_sample_rate = info.sample_rate;
if (original_channels == 0)
original_channels = info.channels;
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::SetAudioOptions (" + codec + ")",
"sample_rate", sample_rate,
"channels", channels,
"bit_rate", bit_rate);
// Enable / Disable audio
info.has_audio = has_audio;
}
// Set audio export options (overloaded function)
void FFmpegWriter::SetAudioOptions(std::string codec, int sample_rate, int bit_rate) {
// Call full signature with some default parameters
FFmpegWriter::SetAudioOptions(
true, codec, sample_rate, 2,
openshot::LAYOUT_STEREO, bit_rate
);
}
// Set custom options (some codecs accept additional params)
void FFmpegWriter::SetOption(StreamType stream, std::string name, std::string value) {
// Declare codec context
AVCodecContext *c = NULL;
AVStream *st = NULL;
std::stringstream convert(value);
if (info.has_video && stream == VIDEO_STREAM && video_st) {
st = video_st;
// Get codec context
c = AV_GET_CODEC_PAR_CONTEXT(st, video_codec_ctx);
// Was a codec / stream found?
if (c) {
if (info.interlaced_frame) {
c->field_order = info.top_field_first ? AV_FIELD_TT : AV_FIELD_BB;
// We only use these two version and ignore AV_FIELD_TB and AV_FIELD_BT
// Otherwise we would need to change the whole export window
}
}
} else if (info.has_audio && stream == AUDIO_STREAM && audio_st) {
st = audio_st;
// Get codec context
c = AV_GET_CODEC_PAR_CONTEXT(st, audio_codec_ctx);
} else
throw NoStreamsFound("The stream was not found. Be sure to call PrepareStreams() first.", path);
// Init AVOption
const AVOption *option = NULL;
// Was a codec / stream found?
if (c)
// Find AVOption (if it exists)
option = AV_OPTION_FIND(c->priv_data, name.c_str());
// Was option found?
if (option || (name == "g" || name == "qmin" || name == "qmax" || name == "max_b_frames" || name == "mb_decision" ||
name == "level" || name == "profile" || name == "slices" || name == "rc_min_rate" || name == "rc_max_rate" ||
name == "rc_buffer_size" || name == "crf" || name == "cqp" || name == "qp")) {
// Check for specific named options
if (name == "g")
// Set gop_size
convert >> c->gop_size;
else if (name == "qmin")
// Minimum quantizer
convert >> c->qmin;
else if (name == "qmax")
// Maximum quantizer
convert >> c->qmax;
else if (name == "max_b_frames")
// Maximum number of B-frames between non-B-frames
convert >> c->max_b_frames;
else if (name == "mb_decision")
// Macroblock decision mode
convert >> c->mb_decision;
else if (name == "level")
// Set codec level
convert >> c->level;
else if (name == "profile")
// Set codec profile
convert >> c->profile;
else if (name == "slices")
// Indicates number of picture subdivisions
convert >> c->slices;
else if (name == "rc_min_rate")
// Minimum bitrate
convert >> c->rc_min_rate;
else if (name == "rc_max_rate")
// Maximum bitrate
convert >> c->rc_max_rate;
else if (name == "rc_buffer_size")
// Buffer size
convert >> c->rc_buffer_size;
else if (name == "cqp") {
// encode quality and special settings like lossless
// This might be better in an extra methods as more options
// and way to set quality are possible
#if USE_HW_ACCEL
if (hw_en_on) {
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),63), 0); // 0-63
} else
#endif // USE_HW_ACCEL
{
switch (c->codec_id) {
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
case AV_CODEC_ID_AV1 :
c->bit_rate = 0;
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),63), 0); // 0-63
break;
#endif
case AV_CODEC_ID_VP8 :
c->bit_rate = 10000000;
av_opt_set_int(c->priv_data, "qp", std::max(std::min(std::stoi(value), 63), 4), 0); // 4-63
break;
case AV_CODEC_ID_VP9 :
c->bit_rate = 0; // Must be zero!
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 63), 0); // 0-63
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
case AV_CODEC_ID_H264 :
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 51), 0); // 0-51
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
c->pix_fmt = PIX_FMT_YUV444P; // no chroma subsampling
}
break;
case AV_CODEC_ID_HEVC :
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 51), 0); // 0-51
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
default:
// For all other codecs assume a range of 0-63
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value), 63), 0); // 0-63
c->bit_rate = 0;
}
}
} else if (name == "crf") {
// encode quality and special settings like lossless
// This might be better in an extra methods as more options
// and way to set quality are possible
#if USE_HW_ACCEL
if (hw_en_on) {
double mbs = 15000000.0;
if (info.video_bit_rate > 0) {
if (info.video_bit_rate > 42) {
mbs = 380000.0;
}
else {
mbs *= std::pow(0.912,info.video_bit_rate);
}
}
c->bit_rate = (int)(mbs);
} else
#endif // USE_HW_ACCEL
{
switch (c->codec_id) {
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
case AV_CODEC_ID_AV1 :
c->bit_rate = 0;
// AV1 only supports "crf" quality values
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value),63), 0);
break;
#endif
case AV_CODEC_ID_VP8 :
c->bit_rate = 10000000;
av_opt_set_int(c->priv_data, "crf", std::max(std::min(std::stoi(value), 63), 4), 0); // 4-63
break;
case AV_CODEC_ID_VP9 :
c->bit_rate = 0; // Must be zero!
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value), 63), 0); // 0-63
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
case AV_CODEC_ID_H264 :
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value), 51), 0); // 0-51
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
c->pix_fmt = PIX_FMT_YUV444P; // no chroma subsampling
}
break;
case AV_CODEC_ID_HEVC :
if (strstr(info.vcodec.c_str(), "svt_hevc") != NULL) {
av_opt_set_int(c->priv_data, "preset", 7, 0);
av_opt_set_int(c->priv_data, "forced-idr",1,0);
av_opt_set_int(c->priv_data, "qp",std::min(std::stoi(value), 51),0);
}
else {
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value), 51), 0); // 0-51
}
if (std::stoi(value) == 0) {
av_opt_set(c->priv_data, "preset", "veryslow", 0);
av_opt_set_int(c->priv_data, "lossless", 1, 0);
}
break;
default:
// If this codec doesn't support crf calculate a bitrate
// TODO: find better formula
double mbs = 15000000.0;
if (info.video_bit_rate > 0) {
if (info.video_bit_rate > 42) {
mbs = 380000.0;
} else {
mbs *= std::pow(0.912, info.video_bit_rate);
}
}
c->bit_rate = (int) (mbs);
}
}
} else if (name == "qp") {
// encode quality and special settings like lossless
// This might be better in an extra methods as more options
// and way to set quality are possible
#if (LIBAVCODEC_VERSION_MAJOR >= 58)
// FFmpeg 4.0+
switch (c->codec_id) {
case AV_CODEC_ID_AV1 :
c->bit_rate = 0;
if (strstr(info.vcodec.c_str(), "svtav1") != NULL) {
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),63), 0);
}
else if (strstr(info.vcodec.c_str(), "rav1e") != NULL) {
// Set number of tiles to a fixed value
// TODO Let user choose number of tiles
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),255), 0);
}
else if (strstr(info.vcodec.c_str(), "aom") != NULL) {
// Set number of tiles to a fixed value
// TODO Let user choose number of tiles
// libaom doesn't have qp only crf
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value),63), 0);
}
else {
av_opt_set_int(c->priv_data, "crf", std::min(std::stoi(value),63), 0);
}
case AV_CODEC_ID_HEVC :
c->bit_rate = 0;
if (strstr(info.vcodec.c_str(), "svt_hevc") != NULL) {
av_opt_set_int(c->priv_data, "qp", std::min(std::stoi(value),51), 0);
av_opt_set_int(c->priv_data, "preset", 7, 0);
av_opt_set_int(c->priv_data, "forced-idr",1,0);
}
break;
}
#endif // FFmpeg 4.0+
} else {
// Set AVOption
AV_OPTION_SET(st, c->priv_data, name.c_str(), value.c_str(), c);
}
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::SetOption (" + (std::string)name + ")", "stream == VIDEO_STREAM", stream == VIDEO_STREAM);
// Muxing dictionary is not part of the codec context.
// Just reusing SetOption function to set popular multiplexing presets.
} else if (name == "muxing_preset") {
if (value == "mp4_faststart") {
// 'moov' box to the beginning; only for MOV, MP4
av_dict_set(&mux_dict, "movflags", "faststart", 0);
} else if (value == "mp4_fragmented") {
// write selfcontained fragmented file, minimum length of the fragment 8 sec; only for MOV, MP4
av_dict_set(&mux_dict, "movflags", "frag_keyframe", 0);
av_dict_set(&mux_dict, "min_frag_duration", "8000000", 0);
}
} else {
throw InvalidOptions("The option is not valid for this codec.", path);
}
}
/// Determine if codec name is valid
bool FFmpegWriter::IsValidCodec(std::string codec_name) {
// Initialize FFMpeg, and register all formats and codecs
AV_REGISTER_ALL
// Find the codec (if any)
if (avcodec_find_encoder_by_name(codec_name.c_str()) == NULL)
return false;
else
return true;
}
// Prepare & initialize streams and open codecs
void FFmpegWriter::PrepareStreams() {
if (!info.has_audio && !info.has_video)
throw InvalidOptions("No video or audio options have been set. You must set has_video or has_audio (or both).", path);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::PrepareStreams [" + path + "]", "info.has_audio", info.has_audio, "info.has_video", info.has_video);
// Initialize the streams (i.e. add the streams)
initialize_streams();
// Mark as 'prepared'
prepare_streams = true;
}
// Write the file header (after the options are set)
void FFmpegWriter::WriteHeader() {
if (!info.has_audio && !info.has_video)
throw InvalidOptions("No video or audio options have been set. You must set has_video or has_audio (or both).", path);
// Open the output file, if needed
if (!(fmt->flags & AVFMT_NOFILE)) {
if (avio_open(&oc->pb, path.c_str(), AVIO_FLAG_WRITE) < 0)
throw InvalidFile("Could not open or write file.", path);
}
// Force the output filename (which doesn't always happen for some reason)
AV_SET_FILENAME(oc, path.c_str());
// Add general metadata (if any)
for (std::map<std::string, std::string>::iterator iter = info.metadata.begin(); iter != info.metadata.end(); ++iter) {
av_dict_set(&oc->metadata, iter->first.c_str(), iter->second.c_str(), 0);
}
// Set multiplexing parameters
AVDictionary *dict = NULL;
bool is_mp4 = strcmp(oc->oformat->name, "mp4");
bool is_mov = strcmp(oc->oformat->name, "mov");
// Set dictionary preset only for MP4 and MOV files
if (is_mp4 || is_mov)
av_dict_copy(&dict, mux_dict, 0);
// Write the stream header
if (avformat_write_header(oc, &dict) != 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteHeader (avformat_write_header)");
throw InvalidFile("Could not write header to file.", path);
};
// Free multiplexing dictionaries sets
if (dict) av_dict_free(&dict);
if (mux_dict) av_dict_free(&mux_dict);
// Mark as 'written'
write_header = true;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteHeader");
}
// Add a frame to the queue waiting to be encoded.
void FFmpegWriter::WriteFrame(std::shared_ptr<Frame> frame) {
// Check for open reader (or throw exception)
if (!is_open)
throw WriterClosed("The FFmpegWriter is closed. Call Open() before calling this method.", path);
// Add frame pointer to "queue", waiting to be processed the next
// time the WriteFrames() method is called.
if (info.has_video && video_st)
spooled_video_frames.push_back(frame);
if (info.has_audio && audio_st)
spooled_audio_frames.push_back(frame);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteFrame", "frame->number", frame->number, "spooled_video_frames.size()", spooled_video_frames.size(), "spooled_audio_frames.size()", spooled_audio_frames.size(), "cache_size", cache_size, "is_writing", is_writing);
// Write the frames once it reaches the correct cache size
if ((int)spooled_video_frames.size() == cache_size || (int)spooled_audio_frames.size() == cache_size) {
// Write frames to video file
write_queued_frames();
}
// Keep track of the last frame added
last_frame = frame;
}
// Write all frames in the queue to the video file.
void FFmpegWriter::write_queued_frames() {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_queued_frames", "spooled_video_frames.size()", spooled_video_frames.size(), "spooled_audio_frames.size()", spooled_audio_frames.size());
// Flip writing flag
is_writing = true;
// Transfer spool to queue
queued_video_frames = spooled_video_frames;
queued_audio_frames = spooled_audio_frames;
// Empty spool
spooled_video_frames.clear();
spooled_audio_frames.clear();
// Create blank exception
bool has_error_encoding_video = false;
// Process all audio frames (in a separate thread)
if (info.has_audio && audio_st && !queued_audio_frames.empty())
write_audio_packets(false);
// Loop through each queued image frame
while (!queued_video_frames.empty()) {
// Get front frame (from the queue)
std::shared_ptr<Frame> frame = queued_video_frames.front();
// Add to processed queue
processed_frames.push_back(frame);
// Encode and add the frame to the output file
if (info.has_video && video_st)
process_video_packet(frame);
// Remove front item
queued_video_frames.pop_front();
} // end while
// Loop back through the frames (in order), and write them to the video file
while (!processed_frames.empty()) {
// Get front frame (from the queue)
std::shared_ptr<Frame> frame = processed_frames.front();
if (info.has_video && video_st) {
// Add to deallocate queue (so we can remove the AVFrames when we are done)
deallocate_frames.push_back(frame);
// Does this frame's AVFrame still exist
if (av_frames.count(frame)) {
// Get AVFrame
AVFrame *frame_final = av_frames[frame];
// Write frame to video file
bool success = write_video_packet(frame, frame_final);
if (!success)
has_error_encoding_video = true;
}
}
// Remove front item
processed_frames.pop_front();
}
// Loop through, and deallocate AVFrames
while (!deallocate_frames.empty()) {
// Get front frame (from the queue)
std::shared_ptr<Frame> frame = deallocate_frames.front();
// Does this frame's AVFrame still exist
if (av_frames.count(frame)) {
// Get AVFrame
AVFrame *av_frame = av_frames[frame];
// Deallocate AVPicture and AVFrame
av_freep(&(av_frame->data[0]));
AV_FREE_FRAME(&av_frame);
av_frames.erase(frame);
}
// Remove front item
deallocate_frames.pop_front();
}
// Done writing
is_writing = false;
// Raise exception from main thread
if (has_error_encoding_video)
throw ErrorEncodingVideo("Error while writing raw video frame", -1);
}
// Write a block of frames from a reader
void FFmpegWriter::WriteFrame(ReaderBase *reader, int64_t start, int64_t length) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteFrame (from Reader)", "start", start, "length", length);
// Loop through each frame (and encoded it)
for (int64_t number = start; number <= length; number++) {
// Get the frame
std::shared_ptr<Frame> f = reader->GetFrame(number);
// Encode frame
WriteFrame(f);
}
}
// Write the file trailer (after all frames are written)
void FFmpegWriter::WriteTrailer() {
// Write any remaining queued frames to video file
write_queued_frames();
// Process final audio frame (if any)
if (info.has_audio && audio_st)
write_audio_packets(true);
// Flush encoders (who sometimes hold on to frames)
flush_encoders();
/* write the trailer, if any. The trailer must be written
* before you close the CodecContexts open when you wrote the
* header; otherwise write_trailer may try to use memory that
* was freed on av_codec_close() */
av_write_trailer(oc);
// Mark as 'written'
write_trailer = true;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteTrailer");
}
// Flush encoders
void FFmpegWriter::flush_encoders() {
if (info.has_audio && audio_codec_ctx && AV_GET_CODEC_TYPE(audio_st) == AVMEDIA_TYPE_AUDIO && AV_GET_CODEC_ATTRIBUTES(audio_st, audio_codec_ctx)->frame_size <= 1)
return;
#if (LIBAVFORMAT_VERSION_MAJOR < 58)
// FFmpeg < 4.0
if (info.has_video && video_codec_ctx && AV_GET_CODEC_TYPE(video_st) == AVMEDIA_TYPE_VIDEO && (oc->oformat->flags & AVFMT_RAWPICTURE) && AV_FIND_DECODER_CODEC_ID(video_st) == AV_CODEC_ID_RAWVIDEO)
return;
#else
if (info.has_video && video_codec_ctx && AV_GET_CODEC_TYPE(video_st) == AVMEDIA_TYPE_VIDEO && AV_FIND_DECODER_CODEC_ID(video_st) == AV_CODEC_ID_RAWVIDEO)
return;
#endif
// FLUSH VIDEO ENCODER
if (info.has_video)
for (;;) {
// Increment PTS (in frames and scaled to the codec's timebase)
write_video_count += av_rescale_q(1, av_make_q(info.fps.den, info.fps.num), video_codec_ctx->time_base);
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
/* encode the image */
int got_packet = 0;
int error_code = 0;
#if IS_FFMPEG_3_2
// Encode video packet (latest version of FFmpeg)
error_code = avcodec_send_frame(video_codec_ctx, NULL);
got_packet = 0;
while (error_code >= 0) {
error_code = avcodec_receive_packet(video_codec_ctx, &pkt);
if (error_code == AVERROR(EAGAIN)|| error_code == AVERROR_EOF) {
got_packet = 0;
// Write packet
avcodec_flush_buffers(video_codec_ctx);
break;
}
if (pkt.pts != AV_NOPTS_VALUE)
pkt.pts = av_rescale_q(pkt.pts, video_codec_ctx->time_base, video_st->time_base);
if (pkt.dts != AV_NOPTS_VALUE)
pkt.dts = av_rescale_q(pkt.dts, video_codec_ctx->time_base, video_st->time_base);
if (pkt.duration > 0)
pkt.duration = av_rescale_q(pkt.duration, video_codec_ctx->time_base, video_st->time_base);
pkt.stream_index = video_st->index;
error_code = av_interleaved_write_frame(oc, &pkt);
}
#else // IS_FFMPEG_3_2
// Encode video packet (older than FFmpeg 3.2)
error_code = avcodec_encode_video2(video_codec_ctx, &pkt, NULL, &got_packet);
#endif // IS_FFMPEG_3_2
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::flush_encoders ERROR [" + (std::string) av_err2str(error_code) + "]", "error_code", error_code);
}
if (!got_packet) {
break;
}
// set the timestamp
if (pkt.pts != AV_NOPTS_VALUE)
pkt.pts = av_rescale_q(pkt.pts, video_codec_ctx->time_base, video_st->time_base);
if (pkt.dts != AV_NOPTS_VALUE)
pkt.dts = av_rescale_q(pkt.dts, video_codec_ctx->time_base, video_st->time_base);
if (pkt.duration > 0)
pkt.duration = av_rescale_q(pkt.duration, video_codec_ctx->time_base, video_st->time_base);
pkt.stream_index = video_st->index;
// Write packet
error_code = av_interleaved_write_frame(oc, &pkt);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::flush_encoders ERROR [" + (std::string)av_err2str(error_code) + "]", "error_code", error_code);
}
}
// FLUSH AUDIO ENCODER
if (info.has_audio) {
for (;;) {
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
pkt.pts = pkt.dts = write_audio_count;
/* encode the image */
int error_code = 0;
int got_packet = 0;
#if IS_FFMPEG_3_2
error_code = avcodec_send_frame(audio_codec_ctx, NULL);
#else
error_code = avcodec_encode_audio2(audio_codec_ctx, &pkt, NULL, &got_packet);
#endif
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::flush_encoders ERROR [" + (std::string) av_err2str(error_code) + "]",
"error_code", error_code);
}
if (!got_packet) {
break;
}
// Since the PTS can change during encoding, set the value again. This seems like a huge hack,
// but it fixes lots of PTS related issues when I do this.
pkt.pts = pkt.dts = write_audio_count;
// Scale the PTS to the audio stream timebase (which is sometimes different than the codec's timebase)
if (pkt.pts != AV_NOPTS_VALUE)
pkt.pts = av_rescale_q(pkt.pts, audio_codec_ctx->time_base, audio_st->time_base);
if (pkt.dts != AV_NOPTS_VALUE)
pkt.dts = av_rescale_q(pkt.dts, audio_codec_ctx->time_base, audio_st->time_base);
if (pkt.duration > 0)
pkt.duration = av_rescale_q(pkt.duration, audio_codec_ctx->time_base, audio_st->time_base);
// set stream
pkt.stream_index = audio_st->index;
pkt.flags |= AV_PKT_FLAG_KEY;
// Write packet
error_code = av_interleaved_write_frame(oc, &pkt);
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod(
"FFmpegWriter::flush_encoders ERROR [" + (std::string) av_err2str(error_code) + "]",
"error_code", error_code);
}
// deallocate memory for packet
AV_FREE_PACKET(&pkt);
}
// Increment PTS (in samples and scaled to the codec's timebase)
// for some reason, it requires me to multiply channels X 2
write_audio_count += av_rescale_q(audio_input_position / (audio_codec_ctx->channels * av_get_bytes_per_sample(AV_SAMPLE_FMT_S16)), av_make_q(1, info.sample_rate), audio_codec_ctx->time_base);
}
}
// Close the video codec
void FFmpegWriter::close_video(AVFormatContext *oc, AVStream *st)
{
#if USE_HW_ACCEL
if (hw_en_on && hw_en_supported) {
if (hw_device_ctx) {
av_buffer_unref(&hw_device_ctx);
hw_device_ctx = NULL;
}
}
#endif // USE_HW_ACCEL
}
// Close the audio codec
void FFmpegWriter::close_audio(AVFormatContext *oc, AVStream *st)
{
// Clear buffers
delete[] samples;
delete[] audio_outbuf;
delete[] audio_encoder_buffer;
samples = NULL;
audio_outbuf = NULL;
audio_encoder_buffer = NULL;