FFmpegWriter.cpp
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/**
* @file
* @brief Source file for FFmpegWriter class
* @author Jonathan Thomas <jonathan@openshot.org>, Fabrice Bellard
*
* @section LICENSE
*
* Copyright (c) 2008-2013 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 "../include/FFmpegWriter.h"
using namespace openshot;
FFmpegWriter::FFmpegWriter(string path) :
path(path), fmt(NULL), oc(NULL), audio_st(NULL), video_st(NULL), audio_pts(0), video_pts(0), 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(NULL), audio_codec(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;
// Initialize FFMpeg, and register all formats and codecs
AV_REGISTER_ALL
// auto detect format
auto_detect_format();
}
// Open the writer
void FFmpegWriter::Open()
{
// Open the writer
is_open = true;
// Prepare streams (if needed)
if (!prepare_streams)
PrepareStreams();
// 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, "", -1, "", -1, "", -1);
// 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, 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 = avcodec_find_encoder_by_name(codec.c_str());
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)
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 audio export options
void FFmpegWriter::SetAudioOptions(bool has_audio, 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, "", -1, "", -1, "", -1);
// Enable / Disable audio
info.has_audio = has_audio;
}
// Set custom options (some codecs accept additional params)
void FFmpegWriter::SetOption(StreamType stream, string name, string value)
{
// Declare codec context
AVCodecContext *c = NULL;
AVStream *st = NULL;
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);
}
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);
}
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"))
{
// 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
// Set AVOption
AV_OPTION_SET(st, c->priv_data, name.c_str(), value.c_str(), c);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::SetOption (" + (string)name + ")", "stream == VIDEO_STREAM", stream == VIDEO_STREAM, "", -1, "", -1, "", -1, "", -1, "", -1);
}
else
throw InvalidOptions("The option is not valid for this codec.", path);
}
/// Determine if codec name is valid
bool FFmpegWriter::IsValidCodec(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, "", -1, "", -1, "", -1, "", -1);
// Initialize the streams (i.e. add the streams)
initialize_streams();
// 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);
// 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)
snprintf(oc->AV_FILENAME, sizeof(oc->AV_FILENAME), "%s", path.c_str());
// Write the stream header, if any
// TODO: add avoptions / parameters instead of NULL
// Add general metadata (if any)
for(std::map<string, 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);
}
if (avformat_write_header(oc, NULL) != 0) {
throw InvalidFile("Could not write header to file.", path);
};
// Mark as 'written'
write_header = true;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::WriteHeader", "", -1, "", -1, "", -1, "", -1, "", -1, "", -1);
}
// 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, "", -1);
// Write the frames once it reaches the correct cache size
if (spooled_video_frames.size() == cache_size || spooled_audio_frames.size() == cache_size)
{
// Is writer currently writing?
if (!is_writing)
// Write frames to video file
write_queued_frames();
else
{
// 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(), "", -1, "", -1, "", -1, "", -1);
// 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();
// Set the number of threads in OpenMP
omp_set_num_threads(OPEN_MP_NUM_PROCESSORS);
// Allow nested OpenMP sections
omp_set_nested(true);
// Create blank exception
bool has_error_encoding_video = false;
#pragma omp parallel
{
#pragma omp single
{
// 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
} // end omp single
#pragma omp single
{
// 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;
} // end omp single
} // end omp parallel
// 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, "", -1, "", -1, "", -1, "", -1);
// 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", "", -1, "", -1, "", -1, "", -1, "", -1, "", -1);
}
// Flush encoders
void FFmpegWriter::flush_encoders()
{
if (info.has_audio && audio_codec && AV_GET_CODEC_TYPE(audio_st) == AVMEDIA_TYPE_AUDIO && AV_GET_CODEC_ATTRIBUTES(audio_st, audio_codec)->frame_size <= 1)
return;
#if (LIBAVFORMAT_VERSION_MAJOR < 58)
if (info.has_video && video_codec && 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;
#endif
int error_code = 0;
int stop_encoding = 1;
// 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, (AVRational){info.fps.den, info.fps.num}, video_codec->time_base);
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
// Pointer for video buffer (if using old FFmpeg version)
uint8_t *video_outbuf = NULL;
/* encode the image */
int got_packet = 0;
int error_code = 0;
#if IS_FFMPEG_3_2
#pragma omp critical (write_video_packet)
{
// Encode video packet (latest version of FFmpeg)
error_code = avcodec_send_frame(video_codec, NULL);
got_packet = 0;
while (error_code >= 0) {
error_code = avcodec_receive_packet(video_codec, &pkt);
if (error_code == AVERROR(EAGAIN)|| error_code == AVERROR_EOF) {
got_packet = 0;
// Write packet
avcodec_flush_buffers(video_codec);
break;
}
if (pkt.pts != AV_NOPTS_VALUE)
pkt.pts = av_rescale_q(pkt.pts, video_codec->time_base, video_st->time_base);
if (pkt.dts != AV_NOPTS_VALUE)
pkt.dts = av_rescale_q(pkt.dts, video_codec->time_base, video_st->time_base);
if (pkt.duration > 0)
pkt.duration = av_rescale_q(pkt.duration, video_codec->time_base, video_st->time_base);
pkt.stream_index = video_st->index;
error_code = av_interleaved_write_frame(oc, &pkt);
}
}
#else
#if LIBAVFORMAT_VERSION_MAJOR >= 54
// Encode video packet (older than FFmpeg 3.2)
error_code = avcodec_encode_video2(video_codec, &pkt, NULL, &got_packet);
#else
// Encode video packet (even older version of FFmpeg)
int video_outbuf_size = 0;
/* encode the image */
int out_size = avcodec_encode_video(video_codec, NULL, video_outbuf_size, NULL);
/* if zero size, it means the image was buffered */
if (out_size > 0) {
if(video_codec->coded_frame->key_frame)
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.data= video_outbuf;
pkt.size= out_size;
// got data back (so encode this frame)
got_packet = 1;
}
#endif
#endif
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::flush_encoders ERROR [" + (string)av_err2str(error_code) + "]", "error_code", error_code, "", -1, "", -1, "", -1, "", -1, "", -1);
}
if (!got_packet) {
stop_encoding = 1;
break;
}
// Override PTS (in frames and scaled to the codec's timebase)
//pkt.pts = write_video_count;
// set the timestamp
if (pkt.pts != AV_NOPTS_VALUE)
pkt.pts = av_rescale_q(pkt.pts, video_codec->time_base, video_st->time_base);
if (pkt.dts != AV_NOPTS_VALUE)
pkt.dts = av_rescale_q(pkt.dts, video_codec->time_base, video_st->time_base);
if (pkt.duration > 0)
pkt.duration = av_rescale_q(pkt.duration, video_codec->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 [" + (string)av_err2str(error_code) + "]", "error_code", error_code, "", -1, "", -1, "", -1, "", -1, "", -1);
}
// Deallocate memory (if needed)
if (video_outbuf)
av_freep(&video_outbuf);
}
// FLUSH AUDIO ENCODER
if (info.has_audio)
for (;;) {
// Increment PTS (in samples and scaled to the codec's timebase)
#if LIBAVFORMAT_VERSION_MAJOR >= 54
// for some reason, it requires me to multiply channels X 2
write_audio_count += av_rescale_q(audio_input_position / (audio_codec->channels * av_get_bytes_per_sample(AV_SAMPLE_FMT_S16)), (AVRational){1, info.sample_rate}, audio_codec->time_base);
#else
write_audio_count += av_rescale_q(audio_input_position / audio_codec->channels, (AVRational){1, info.sample_rate}, audio_codec->time_base);
#endif
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
pkt.pts = pkt.dts = write_audio_count;
/* encode the image */
int got_packet = 0;
#if IS_FFMPEG_3_2
avcodec_send_frame(audio_codec, NULL);
got_packet = 0;
#else
error_code = avcodec_encode_audio2(audio_codec, &pkt, NULL, &got_packet);
#endif
if (error_code < 0) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::flush_encoders ERROR [" + (string)av_err2str(error_code) + "]", "error_code", error_code, "", -1, "", -1, "", -1, "", -1, "", -1);
}
if (!got_packet) {
stop_encoding = 1;
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->time_base, audio_st->time_base);
if (pkt.dts != AV_NOPTS_VALUE)
pkt.dts = av_rescale_q(pkt.dts, audio_codec->time_base, audio_st->time_base);
if (pkt.duration > 0)
pkt.duration = av_rescale_q(pkt.duration, audio_codec->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 [" + (string)av_err2str(error_code) + "]", "error_code", error_code, "", -1, "", -1, "", -1, "", -1, "", -1);
}
// deallocate memory for packet
AV_FREE_PACKET(&pkt);
}
}
// Close the video codec
void FFmpegWriter::close_video(AVFormatContext *oc, AVStream *st)
{
AV_FREE_CONTEXT(video_codec);
video_codec = NULL;
}
// Close the audio codec
void FFmpegWriter::close_audio(AVFormatContext *oc, AVStream *st)
{
AV_FREE_CONTEXT(audio_codec);
audio_codec = NULL;
// Clear buffers
delete[] samples;
delete[] audio_outbuf;
delete[] audio_encoder_buffer;
samples = NULL;
audio_outbuf = NULL;
audio_encoder_buffer = NULL;
// Deallocate resample buffer
if (avr) {
SWR_CLOSE(avr);
SWR_FREE(&avr);
avr = NULL;
}
if (avr_planar) {
SWR_CLOSE(avr_planar);
SWR_FREE(&avr_planar);
avr_planar = NULL;
}
}
// Close the writer
void FFmpegWriter::Close()
{
// Write trailer (if needed)
if (!write_trailer)
WriteTrailer();
// Close each codec
if (video_st)
close_video(oc, video_st);
if (audio_st)
close_audio(oc, audio_st);
// Deallocate image scalers
if (image_rescalers.size() > 0)
RemoveScalers();
// Free the streams
for (int i = 0; i < oc->nb_streams; i++) {
av_freep(AV_GET_CODEC_ATTRIBUTES(&oc->streams[i], &oc->streams[i]));
av_freep(&oc->streams[i]);
}
if (!(fmt->flags & AVFMT_NOFILE)) {
/* close the output file */
avio_close(oc->pb);
}
// Reset frame counters
write_video_count = 0;
write_audio_count = 0;
// Free the context
av_freep(&oc);
// Close writer
is_open = false;
prepare_streams = false;
write_header = false;
write_trailer = false;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::Close", "", -1, "", -1, "", -1, "", -1, "", -1, "", -1);
}
// Add an AVFrame to the cache
void FFmpegWriter::add_avframe(std::shared_ptr<Frame> frame, AVFrame* av_frame)
{
// Add AVFrame to map (if it does not already exist)
if (!av_frames.count(frame))
{
// Add av_frame
av_frames[frame] = av_frame;
}
else
{
// Do not add, and deallocate this AVFrame
AV_FREE_FRAME(&av_frame);
}
}
// Add an audio output stream
AVStream* FFmpegWriter::add_audio_stream()
{
AVCodecContext *c;
AVStream *st;
// Find the audio codec
AVCodec *codec = avcodec_find_encoder_by_name(info.acodec.c_str());
if (codec == NULL)
throw InvalidCodec("A valid audio codec could not be found for this file.", path);
// Create a new audio stream
AV_FORMAT_NEW_STREAM(oc, audio_codec, codec, st)
c->codec_id = codec->id;
#if LIBAVFORMAT_VERSION_MAJOR >= 53
c->codec_type = AVMEDIA_TYPE_AUDIO;
#else
c->codec_type = CODEC_TYPE_AUDIO;
#endif
// Set the sample parameters
c->bit_rate = info.audio_bit_rate;
c->channels = info.channels;
// Set valid sample rate (or throw error)
if (codec->supported_samplerates) {
int i;
for (i = 0; codec->supported_samplerates[i] != 0; i++)
if (info.sample_rate == codec->supported_samplerates[i])
{
// Set the valid sample rate
c->sample_rate = info.sample_rate;
break;
}
if (codec->supported_samplerates[i] == 0)
throw InvalidSampleRate("An invalid sample rate was detected for this codec.", path);
} else
// Set sample rate
c->sample_rate = info.sample_rate;
// Set a valid number of channels (or throw error)
int channel_layout = info.channel_layout;
if (codec->channel_layouts) {
int i;
for (i = 0; codec->channel_layouts[i] != 0; i++)
if (channel_layout == codec->channel_layouts[i])
{
// Set valid channel layout
c->channel_layout = channel_layout;
break;
}
if (codec->channel_layouts[i] == 0)
throw InvalidChannels("An invalid channel layout was detected (i.e. MONO / STEREO).", path);
} else
// Set valid channel layout
c->channel_layout = channel_layout;
// Choose a valid sample_fmt
if (codec->sample_fmts) {
for (int i = 0; codec->sample_fmts[i] != AV_SAMPLE_FMT_NONE; i++)
{
// Set sample format to 1st valid format (and then exit loop)
c->sample_fmt = codec->sample_fmts[i];
break;
}
}
if (c->sample_fmt == AV_SAMPLE_FMT_NONE) {
// Default if no sample formats found
c->sample_fmt = AV_SAMPLE_FMT_S16;
}
// some formats want stream headers to be separate
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
#if (LIBAVCODEC_VERSION_MAJOR >= 57)
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
#else
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
#endif
AV_COPY_PARAMS_FROM_CONTEXT(st, c);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::add_audio_stream", "c->codec_id", c->codec_id, "c->bit_rate", c->bit_rate, "c->channels", c->channels, "c->sample_fmt", c->sample_fmt, "c->channel_layout", c->channel_layout, "c->sample_rate", c->sample_rate);
return st;
}
// Add a video output stream
AVStream* FFmpegWriter::add_video_stream()
{
AVCodecContext *c;
AVStream *st;
// Find the video codec
AVCodec *codec = avcodec_find_encoder_by_name(info.vcodec.c_str());
if (codec == NULL)
throw InvalidCodec("A valid video codec could not be found for this file.", path);
// Create a new video stream
AV_FORMAT_NEW_STREAM(oc, video_codec, codec, st)
c->codec_id = codec->id;
#if LIBAVFORMAT_VERSION_MAJOR >= 53
c->codec_type = AVMEDIA_TYPE_VIDEO;
#else
c->codec_type = CODEC_TYPE_VIDEO;
#endif
/* Init video encoder options */
c->bit_rate = info.video_bit_rate;
//TODO: Implement variable bitrate feature (which actually works). This implementation throws
//invalid bitrate errors and rc buffer underflow errors, etc...
//c->rc_min_rate = info.video_bit_rate;
//c->rc_max_rate = info.video_bit_rate;
//c->rc_buffer_size = FFMAX(c->rc_max_rate, 15000000) * 112L / 15000000 * 16384;
//if ( !c->rc_initial_buffer_occupancy )
// c->rc_initial_buffer_occupancy = c->rc_buffer_size * 3/4;
c->qmin = 2;
c->qmax = 30;
/* resolution must be a multiple of two */
// TODO: require /2 height and width
c->width = info.width;
c->height = info.height;
/* time base: 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
identically 1. */
c->time_base.num = info.video_timebase.num;
c->time_base.den = info.video_timebase.den;
#if LIBAVFORMAT_VERSION_MAJOR >= 56
c->framerate = av_inv_q(c->time_base);
#endif
st->avg_frame_rate = av_inv_q(c->time_base);
st->time_base.num = info.video_timebase.num;
st->time_base.den = info.video_timebase.den;
c->gop_size = 12; /* TODO: add this to "info"... emit one intra frame every twelve frames at most */
c->max_b_frames = 10;
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;
// some formats want stream headers to be separate
if (oc->oformat->flags & AVFMT_GLOBALHEADER)
#if (LIBAVCODEC_VERSION_MAJOR >= 57)
c->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
#else
c->flags |= CODEC_FLAG_GLOBAL_HEADER;
#endif
// Find all supported pixel formats for this codec
const PixelFormat* supported_pixel_formats = codec->pix_fmts;
while (supported_pixel_formats != NULL && *supported_pixel_formats != PIX_FMT_NONE) {
// Assign the 1st valid pixel format (if one is missing)
if (c->pix_fmt == PIX_FMT_NONE)
c->pix_fmt = *supported_pixel_formats;
++supported_pixel_formats;
}
// Codec doesn't have any pix formats?
if (c->pix_fmt == PIX_FMT_NONE) {
if(fmt->video_codec == AV_CODEC_ID_RAWVIDEO) {
// Raw video should use RGB24
c->pix_fmt = PIX_FMT_RGB24;
#if (LIBAVFORMAT_VERSION_MAJOR < 58)
if (strcmp(fmt->name, "gif") != 0)
// If not GIF format, skip the encoding process
// Set raw picture flag (so we don't encode this video)
oc->oformat->flags |= AVFMT_RAWPICTURE;
#endif
} else {
// Set the default codec
c->pix_fmt = PIX_FMT_YUV420P;
}
}
AV_COPY_PARAMS_FROM_CONTEXT(st, c);
#if (LIBAVFORMAT_VERSION_MAJOR < 58)
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::add_video_stream (" + (string)fmt->name + " : " + (string)av_get_pix_fmt_name(c->pix_fmt) + ")", "c->codec_id", c->codec_id, "c->bit_rate", c->bit_rate, "c->pix_fmt", c->pix_fmt, "oc->oformat->flags", oc->oformat->flags, "AVFMT_RAWPICTURE", AVFMT_RAWPICTURE, "", -1);
#else
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::add_video_stream (" + (string)fmt->name + " : " + (string)av_get_pix_fmt_name(c->pix_fmt) + ")", "c->codec_id", c->codec_id, "c->bit_rate", c->bit_rate, "c->pix_fmt", c->pix_fmt, "oc->oformat->flags", oc->oformat->flags, "", -1, "", -1);
#endif
return st;
}
// open audio codec
void FFmpegWriter::open_audio(AVFormatContext *oc, AVStream *st)
{
AVCodec *codec;
AV_GET_CODEC_FROM_STREAM(st, audio_codec)
// Set number of threads equal to number of processors (not to exceed 16)
audio_codec->thread_count = min(FF_NUM_PROCESSORS, 16);
// Find the audio encoder
codec = avcodec_find_encoder_by_name(info.acodec.c_str());
if (!codec)
codec = avcodec_find_encoder(audio_codec->codec_id);
if (!codec)
throw InvalidCodec("Could not find codec", path);
// Init options
AVDictionary *opts = NULL;
av_dict_set(&opts, "strict", "experimental", 0);
// Open the codec
if (avcodec_open2(audio_codec, codec, &opts) < 0)
throw InvalidCodec("Could not open codec", path);
AV_COPY_PARAMS_FROM_CONTEXT(st, audio_codec);
// Free options
av_dict_free(&opts);
// Calculate the size of the input frame (i..e how many samples per packet), and the output buffer
// TODO: Ugly hack for PCM codecs (will be removed ASAP with new PCM support to compute the input frame size in samples
if (audio_codec->frame_size <= 1) {
// No frame size found... so calculate
audio_input_frame_size = 50000 / info.channels;
int s = AV_FIND_DECODER_CODEC_ID(st);
switch (s) {
case AV_CODEC_ID_PCM_S16LE:
case AV_CODEC_ID_PCM_S16BE:
case AV_CODEC_ID_PCM_U16LE:
case AV_CODEC_ID_PCM_U16BE:
audio_input_frame_size >>= 1;
break;
default:
break;
}
} else {
// Set frame size based on the codec
audio_input_frame_size = audio_codec->frame_size;
}
// Set the initial frame size (since it might change during resampling)
initial_audio_input_frame_size = audio_input_frame_size;
// Allocate array for samples
samples = new int16_t[AVCODEC_MAX_AUDIO_FRAME_SIZE];
// Set audio output buffer (used to store the encoded audio)
audio_outbuf_size = AVCODEC_MAX_AUDIO_FRAME_SIZE;
audio_outbuf = new uint8_t[audio_outbuf_size];
// Set audio packet encoding buffer
audio_encoder_buffer_size = AUDIO_PACKET_ENCODING_SIZE;
audio_encoder_buffer = new uint8_t[audio_encoder_buffer_size];
// Add audio metadata (if any)
for(std::map<string, string>::iterator iter = info.metadata.begin(); iter != info.metadata.end(); ++iter)
{
av_dict_set(&st->metadata, iter->first.c_str(), iter->second.c_str(), 0);
}
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::open_audio", "audio_codec->thread_count", audio_codec->thread_count, "audio_input_frame_size", audio_input_frame_size, "buffer_size", AVCODEC_MAX_AUDIO_FRAME_SIZE + MY_INPUT_BUFFER_PADDING_SIZE, "", -1, "", -1, "", -1);
}
// open video codec
void FFmpegWriter::open_video(AVFormatContext *oc, AVStream *st)
{
AVCodec *codec;
AV_GET_CODEC_FROM_STREAM(st, video_codec)
// Set number of threads equal to number of processors (not to exceed 16)
video_codec->thread_count = min(FF_NUM_PROCESSORS, 16);
/* find the video encoder */
codec = avcodec_find_encoder_by_name(info.vcodec.c_str());
if (!codec)
codec = avcodec_find_encoder(AV_FIND_DECODER_CODEC_ID(st));
if (!codec)
throw InvalidCodec("Could not find codec", path);
/* Force max_b_frames to 0 in some cases (i.e. for mjpeg image sequences */
if(video_codec->max_b_frames && video_codec->codec_id != AV_CODEC_ID_MPEG4 && video_codec->codec_id != AV_CODEC_ID_MPEG1VIDEO && video_codec->codec_id != AV_CODEC_ID_MPEG2VIDEO)
video_codec->max_b_frames = 0;
// Init options
AVDictionary *opts = NULL;
av_dict_set(&opts, "strict", "experimental", 0);
/* open the codec */
if (avcodec_open2(video_codec, codec, &opts) < 0)
throw InvalidCodec("Could not open codec", path);
AV_COPY_PARAMS_FROM_CONTEXT(st, video_codec);
// Free options
av_dict_free(&opts);
// Add video metadata (if any)
for(std::map<string, string>::iterator iter = info.metadata.begin(); iter != info.metadata.end(); ++iter)
{
av_dict_set(&st->metadata, iter->first.c_str(), iter->second.c_str(), 0);
}
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::open_video", "video_codec->thread_count", video_codec->thread_count, "", -1, "", -1, "", -1, "", -1, "", -1);
}
// write all queued frames' audio to the video file
void FFmpegWriter::write_audio_packets(bool final)
{
#pragma omp task firstprivate(final)
{
// Init audio buffers / variables
int total_frame_samples = 0;
int frame_position = 0;
int channels_in_frame = 0;
int sample_rate_in_frame = 0;
int samples_in_frame = 0;
ChannelLayout channel_layout_in_frame = LAYOUT_MONO; // default channel layout
// Create a new array (to hold all S16 audio samples, for the current queued frames
int16_t* all_queued_samples = (int16_t*)av_malloc((sizeof(int16_t)*(queued_audio_frames.size() * AVCODEC_MAX_AUDIO_FRAME_SIZE)));
int16_t* all_resampled_samples = NULL;
int16_t* final_samples_planar = NULL;
int16_t* final_samples = NULL;
// Loop through each queued audio frame
while (!queued_audio_frames.empty())
{
// Get front frame (from the queue)
std::shared_ptr<Frame> frame = queued_audio_frames.front();
// Get the audio details from this frame
sample_rate_in_frame = frame->SampleRate();
samples_in_frame = frame->GetAudioSamplesCount();
channels_in_frame = frame->GetAudioChannelsCount();
channel_layout_in_frame = frame->ChannelsLayout();
// Get audio sample array
float* frame_samples_float = NULL;
// Get samples interleaved together (c1 c2 c1 c2 c1 c2)
frame_samples_float = frame->GetInterleavedAudioSamples(sample_rate_in_frame, NULL, &samples_in_frame);
// Calculate total samples
total_frame_samples = samples_in_frame * channels_in_frame;
// Translate audio sample values back to 16 bit integers
for (int s = 0; s < total_frame_samples; s++, frame_position++)
// Translate sample value and copy into buffer
all_queued_samples[frame_position] = int(frame_samples_float[s] * (1 << 15));
// Deallocate float array
delete[] frame_samples_float;
// Remove front item
queued_audio_frames.pop_front();
} // end while
// Update total samples (since we've combined all queued frames)
total_frame_samples = frame_position;
int remaining_frame_samples = total_frame_samples;
int samples_position = 0;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets", "final", final, "total_frame_samples", total_frame_samples, "channel_layout_in_frame", channel_layout_in_frame, "channels_in_frame", channels_in_frame, "samples_in_frame", samples_in_frame, "LAYOUT_MONO", LAYOUT_MONO);
// Keep track of the original sample format
AVSampleFormat output_sample_fmt = audio_codec->sample_fmt;
AVFrame *audio_frame = NULL;
if (!final) {
// Create input frame (and allocate arrays)
audio_frame = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(audio_frame);
audio_frame->nb_samples = total_frame_samples / channels_in_frame;
// Fill input frame with sample data
avcodec_fill_audio_frame(audio_frame, channels_in_frame, AV_SAMPLE_FMT_S16, (uint8_t *) all_queued_samples,
audio_encoder_buffer_size, 0);
// Do not convert audio to planar format (yet). We need to keep everything interleaved at this point.
switch (audio_codec->sample_fmt)
{
case AV_SAMPLE_FMT_FLTP:
{
output_sample_fmt = AV_SAMPLE_FMT_FLT;
break;
}
case AV_SAMPLE_FMT_S32P:
{
output_sample_fmt = AV_SAMPLE_FMT_S32;
break;
}
case AV_SAMPLE_FMT_S16P:
{
output_sample_fmt = AV_SAMPLE_FMT_S16;
break;
}
case AV_SAMPLE_FMT_U8P:
{
output_sample_fmt = AV_SAMPLE_FMT_U8;
break;
}
}
// Update total samples & input frame size (due to bigger or smaller data types)
total_frame_samples *= (float(info.sample_rate) / sample_rate_in_frame); // adjust for different byte sizes
total_frame_samples *= (float(info.channels) / channels_in_frame); // adjust for different # of channels
// Set remaining samples
remaining_frame_samples = total_frame_samples;
// Create output frame (and allocate arrays)
AVFrame *audio_converted = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(audio_converted);
audio_converted->nb_samples = total_frame_samples / channels_in_frame;
av_samples_alloc(audio_converted->data, audio_converted->linesize, info.channels, audio_converted->nb_samples, output_sample_fmt, 0);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets (1st resampling)", "in_sample_fmt", AV_SAMPLE_FMT_S16, "out_sample_fmt", output_sample_fmt, "in_sample_rate", sample_rate_in_frame, "out_sample_rate", info.sample_rate, "in_channels", channels_in_frame, "out_channels", info.channels);
// setup resample context
if (!avr) {
avr = SWR_ALLOC();
av_opt_set_int(avr, "in_channel_layout", channel_layout_in_frame, 0);
av_opt_set_int(avr, "out_channel_layout", info.channel_layout, 0);
av_opt_set_int(avr, "in_sample_fmt", AV_SAMPLE_FMT_S16, 0);
av_opt_set_int(avr, "out_sample_fmt", output_sample_fmt, 0); // planar not allowed here
av_opt_set_int(avr, "in_sample_rate", sample_rate_in_frame, 0);
av_opt_set_int(avr, "out_sample_rate", info.sample_rate, 0);
av_opt_set_int(avr, "in_channels", channels_in_frame, 0);
av_opt_set_int(avr, "out_channels", info.channels, 0);
SWR_INIT(avr);
}
int nb_samples = 0;
// Convert audio samples
nb_samples = SWR_CONVERT(avr, // audio resample context
audio_converted->data, // output data pointers
audio_converted->linesize[0], // output plane size, in bytes. (0 if unknown)
audio_converted->nb_samples, // maximum number of samples that the output buffer can hold
audio_frame->data, // input data pointers
audio_frame->linesize[0], // input plane size, in bytes (0 if unknown)
audio_frame->nb_samples); // number of input samples to convert
// Create a new array (to hold all resampled S16 audio samples)
all_resampled_samples = (int16_t*)av_malloc(sizeof(int16_t) * nb_samples * info.channels * (av_get_bytes_per_sample(output_sample_fmt) / av_get_bytes_per_sample(AV_SAMPLE_FMT_S16)));
// Copy audio samples over original samples
memcpy(all_resampled_samples, audio_converted->data[0], nb_samples * info.channels * av_get_bytes_per_sample(output_sample_fmt));
// Remove converted audio
av_freep(&(audio_frame->data[0]));
AV_FREE_FRAME(&audio_frame);
av_freep(&audio_converted->data[0]);
AV_FREE_FRAME(&audio_converted);
all_queued_samples = NULL; // this array cleared with above call
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets (Successfully completed 1st resampling)", "nb_samples", nb_samples, "remaining_frame_samples", remaining_frame_samples, "", -1, "", -1, "", -1, "", -1);
}
// Loop until no more samples
while (remaining_frame_samples > 0 || final) {
// Get remaining samples needed for this packet
int remaining_packet_samples = (audio_input_frame_size * info.channels) - audio_input_position;
// Determine how many samples we need
int diff = 0;
if (remaining_frame_samples >= remaining_packet_samples)
diff = remaining_packet_samples;
else if (remaining_frame_samples < remaining_packet_samples)
diff = remaining_frame_samples;
// Copy frame samples into the packet samples array
if (!final)
//TODO: Make this more sane
memcpy(samples + (audio_input_position * (av_get_bytes_per_sample(output_sample_fmt) / av_get_bytes_per_sample(AV_SAMPLE_FMT_S16))), all_resampled_samples + samples_position, diff * av_get_bytes_per_sample(output_sample_fmt));
// Increment counters
audio_input_position += diff;
samples_position += diff * (av_get_bytes_per_sample(output_sample_fmt) / av_get_bytes_per_sample(AV_SAMPLE_FMT_S16));
remaining_frame_samples -= diff;
remaining_packet_samples -= diff;
// Do we have enough samples to proceed?
if (audio_input_position < (audio_input_frame_size * info.channels) && !final)
// Not enough samples to encode... so wait until the next frame
break;
// Convert to planar (if needed by audio codec)
AVFrame *frame_final = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(frame_final);
if (av_sample_fmt_is_planar(audio_codec->sample_fmt))
{
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets (2nd resampling for Planar formats)", "in_sample_fmt", output_sample_fmt, "out_sample_fmt", audio_codec->sample_fmt, "in_sample_rate", info.sample_rate, "out_sample_rate", info.sample_rate, "in_channels", info.channels, "out_channels", info.channels);
// setup resample context
if (!avr_planar) {
avr_planar = SWR_ALLOC();
av_opt_set_int(avr_planar, "in_channel_layout", info.channel_layout, 0);
av_opt_set_int(avr_planar, "out_channel_layout", info.channel_layout, 0);
av_opt_set_int(avr_planar, "in_sample_fmt", output_sample_fmt, 0);
av_opt_set_int(avr_planar, "out_sample_fmt", audio_codec->sample_fmt, 0); // planar not allowed here
av_opt_set_int(avr_planar, "in_sample_rate", info.sample_rate, 0);
av_opt_set_int(avr_planar, "out_sample_rate", info.sample_rate, 0);
av_opt_set_int(avr_planar, "in_channels", info.channels, 0);
av_opt_set_int(avr_planar, "out_channels", info.channels, 0);
SWR_INIT(avr_planar);
}
// Create input frame (and allocate arrays)
audio_frame = AV_ALLOCATE_FRAME();
AV_RESET_FRAME(audio_frame);
audio_frame->nb_samples = audio_input_position / info.channels;
// Create a new array
final_samples_planar = (int16_t*)av_malloc(sizeof(int16_t) * audio_frame->nb_samples * info.channels * (av_get_bytes_per_sample(output_sample_fmt) / av_get_bytes_per_sample(AV_SAMPLE_FMT_S16)));
// Copy audio into buffer for frame
memcpy(final_samples_planar, samples, audio_frame->nb_samples * info.channels * av_get_bytes_per_sample(output_sample_fmt));
// Fill input frame with sample data
avcodec_fill_audio_frame(audio_frame, info.channels, output_sample_fmt, (uint8_t *) final_samples_planar,
audio_encoder_buffer_size, 0);
// Create output frame (and allocate arrays)
frame_final->nb_samples = audio_input_frame_size;
av_samples_alloc(frame_final->data, frame_final->linesize, info.channels, frame_final->nb_samples, audio_codec->sample_fmt, 0);
// Convert audio samples
int nb_samples = SWR_CONVERT(avr_planar, // audio resample context
frame_final->data, // output data pointers
frame_final->linesize[0], // output plane size, in bytes. (0 if unknown)
frame_final->nb_samples, // maximum number of samples that the output buffer can hold
audio_frame->data, // input data pointers
audio_frame->linesize[0], // input plane size, in bytes (0 if unknown)
audio_frame->nb_samples); // number of input samples to convert
// Copy audio samples over original samples
if (nb_samples > 0)
memcpy(samples, frame_final->data[0], nb_samples * av_get_bytes_per_sample(audio_codec->sample_fmt) * info.channels);
// deallocate AVFrame
av_freep(&(audio_frame->data[0]));
AV_FREE_FRAME(&audio_frame);
all_queued_samples = NULL; // this array cleared with above call
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets (Successfully completed 2nd resampling for Planar formats)", "nb_samples", nb_samples, "", -1, "", -1, "", -1, "", -1, "", -1);
} else {
// Create a new array
final_samples = new int16_t[audio_input_position * (av_get_bytes_per_sample(audio_codec->sample_fmt) / av_get_bytes_per_sample(AV_SAMPLE_FMT_S16))];
// Copy audio into buffer for frame
memcpy(final_samples, samples, audio_input_position * av_get_bytes_per_sample(audio_codec->sample_fmt));
// Init the nb_samples property
frame_final->nb_samples = audio_input_frame_size;
// Fill the final_frame AVFrame with audio (non planar)
avcodec_fill_audio_frame(frame_final, audio_codec->channels, audio_codec->sample_fmt, (uint8_t *) final_samples,
audio_encoder_buffer_size, 0);
}
// Increment PTS (in samples)
write_audio_count += FFMIN(audio_input_frame_size, audio_input_position);
frame_final->pts = write_audio_count; // Set the AVFrame's PTS
// Init the packet
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = audio_encoder_buffer;
pkt.size = audio_encoder_buffer_size;
// Set the packet's PTS prior to encoding
pkt.pts = pkt.dts = write_audio_count;
/* encode the audio samples */
int got_packet_ptr = 0;
#if IS_FFMPEG_3_2
// Encode audio (latest version of FFmpeg)
int error_code;
int ret = 0;
int frame_finished = 0;
error_code = ret = avcodec_send_frame(audio_codec, frame_final);
if (ret < 0 && ret != AVERROR(EINVAL) && ret != AVERROR_EOF) {
avcodec_send_frame(audio_codec, NULL);
}
else {
if (ret >= 0)
pkt.size = 0;
ret = avcodec_receive_packet(audio_codec, &pkt);
if (ret >= 0)
frame_finished = 1;
if(ret == AVERROR(EINVAL) || ret == AVERROR_EOF) {
avcodec_flush_buffers(audio_codec);
ret = 0;
}
if (ret >= 0) {
ret = frame_finished;
}
}
if (!pkt.data && !frame_finished)
{
ret = -1;
}
got_packet_ptr = ret;
#else
// Encode audio (older versions of FFmpeg)
int error_code = avcodec_encode_audio2(audio_codec, &pkt, frame_final, &got_packet_ptr);
#endif
/* if zero size, it means the image was buffered */
if (error_code == 0 && got_packet_ptr) {
// 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->time_base, audio_st->time_base);
if (pkt.dts != AV_NOPTS_VALUE)
pkt.dts = av_rescale_q(pkt.dts, audio_codec->time_base, audio_st->time_base);
if (pkt.duration > 0)
pkt.duration = av_rescale_q(pkt.duration, audio_codec->time_base, audio_st->time_base);
// set stream
pkt.stream_index = audio_st->index;
pkt.flags |= AV_PKT_FLAG_KEY;
/* write the compressed frame in the media file */
int error_code = av_interleaved_write_frame(oc, &pkt);
if (error_code < 0)
{
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets ERROR [" + (string)av_err2str(error_code) + "]", "error_code", error_code, "", -1, "", -1, "", -1, "", -1, "", -1);
}
}
if (error_code < 0)
{
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_audio_packets ERROR [" + (string)av_err2str(error_code) + "]", "error_code", error_code, "", -1, "", -1, "", -1, "", -1, "", -1);
}
// deallocate AVFrame
av_freep(&(frame_final->data[0]));
AV_FREE_FRAME(&frame_final);
// deallocate memory for packet
AV_FREE_PACKET(&pkt);
// Reset position
audio_input_position = 0;
final = false;
}
// Delete arrays (if needed)
if (all_resampled_samples) {
av_freep(&all_resampled_samples);
all_resampled_samples = NULL;
}
if (all_queued_samples) {
av_freep(&all_queued_samples);
all_queued_samples = NULL;
}
} // end task
}
// Allocate an AVFrame object
AVFrame* FFmpegWriter::allocate_avframe(PixelFormat pix_fmt, int width, int height, int *buffer_size, uint8_t *new_buffer)
{
// Create an RGB AVFrame
AVFrame *new_av_frame = NULL;
// Allocate an AVFrame structure
new_av_frame = AV_ALLOCATE_FRAME();
if (new_av_frame == NULL)
throw OutOfMemory("Could not allocate AVFrame", path);
// Determine required buffer size and allocate buffer
*buffer_size = AV_GET_IMAGE_SIZE(pix_fmt, width, height);
// Create buffer (if not provided)
if (!new_buffer)
{
// New Buffer
new_buffer = (uint8_t*)av_malloc(*buffer_size * sizeof(uint8_t));
// Attach buffer to AVFrame
AV_COPY_PICTURE_DATA(new_av_frame, new_buffer, pix_fmt, width, height);
new_av_frame->width = width;
new_av_frame->height = height;
new_av_frame->format = pix_fmt;
}
// return AVFrame
return new_av_frame;
}
// process video frame
void FFmpegWriter::process_video_packet(std::shared_ptr<Frame> frame)
{
// Determine the height & width of the source image
int source_image_width = frame->GetWidth();
int source_image_height = frame->GetHeight();
// Do nothing if size is 1x1 (i.e. no image in this frame)
if (source_image_height == 1 && source_image_width == 1)
return;
// Init rescalers (if not initialized yet)
if (image_rescalers.size() == 0)
InitScalers(source_image_width, source_image_height);
// Get a unique rescaler (for this thread)
SwsContext *scaler = image_rescalers[rescaler_position];
rescaler_position++;
if (rescaler_position == num_of_rescalers)
rescaler_position = 0;
#pragma omp task firstprivate(frame, scaler, source_image_width, source_image_height)
{
// Allocate an RGB frame & final output frame
int bytes_source = 0;
int bytes_final = 0;
AVFrame *frame_source = NULL;
const uchar *pixels = NULL;
// Get a list of pixels from source image
pixels = frame->GetPixels();
// Init AVFrame for source image & final (converted image)
frame_source = allocate_avframe(PIX_FMT_RGBA, source_image_width, source_image_height, &bytes_source, (uint8_t*) pixels);
#if IS_FFMPEG_3_2
AVFrame *frame_final = allocate_avframe((AVPixelFormat)(video_st->codecpar->format), info.width, info.height, &bytes_final, NULL);
#else
AVFrame *frame_final = allocate_avframe(video_codec->pix_fmt, info.width, info.height, &bytes_final, NULL);
#endif
// Fill with data
AV_COPY_PICTURE_DATA(frame_source, (uint8_t*)pixels, PIX_FMT_RGBA, source_image_width, source_image_height);
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::process_video_packet", "frame->number", frame->number, "bytes_source", bytes_source, "bytes_final", bytes_final, "", -1, "", -1, "", -1);
// Resize & convert pixel format
sws_scale(scaler, frame_source->data, frame_source->linesize, 0,
source_image_height, frame_final->data, frame_final->linesize);
// Add resized AVFrame to av_frames map
#pragma omp critical (av_frames_section)
add_avframe(frame, frame_final);
// Deallocate memory
AV_FREE_FRAME(&frame_source);
} // end task
}
// write video frame
bool FFmpegWriter::write_video_packet(std::shared_ptr<Frame> frame, AVFrame* frame_final)
{
#if (LIBAVFORMAT_VERSION_MAJOR >= 58)
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet", "frame->number", frame->number, "oc->oformat->flags", oc->oformat->flags, "", -1, "", -1, "", -1, "", -1);
#else
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet", "frame->number", frame->number, "oc->oformat->flags & AVFMT_RAWPICTURE", oc->oformat->flags & AVFMT_RAWPICTURE, "", -1, "", -1, "", -1, "", -1);
if (oc->oformat->flags & AVFMT_RAWPICTURE) {
// Raw video case.
AVPacket pkt;
av_init_packet(&pkt);
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.stream_index= video_st->index;
pkt.data= (uint8_t*)frame_final->data;
pkt.size= sizeof(AVPicture);
// Increment PTS (in frames and scaled to the codec's timebase)
write_video_count += av_rescale_q(1, (AVRational){info.fps.den, info.fps.num}, video_codec->time_base);
pkt.pts = write_video_count;
/* write the compressed frame in the media file */
int error_code = av_interleaved_write_frame(oc, &pkt);
if (error_code < 0)
{
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet ERROR [" + (string)av_err2str(error_code) + "]", "error_code", error_code, "", -1, "", -1, "", -1, "", -1, "", -1);
return false;
}
// Deallocate packet
AV_FREE_PACKET(&pkt);
} else
#endif
{
AVPacket pkt;
av_init_packet(&pkt);
pkt.data = NULL;
pkt.size = 0;
pkt.pts = pkt.dts = AV_NOPTS_VALUE;
// Pointer for video buffer (if using old FFmpeg version)
uint8_t *video_outbuf = NULL;
// Increment PTS (in frames and scaled to the codec's timebase)
write_video_count += av_rescale_q(1, (AVRational){info.fps.den, info.fps.num}, video_codec->time_base);
// Assign the initial AVFrame PTS from the frame counter
frame_final->pts = write_video_count;
/* encode the image */
int got_packet_ptr = 0;
int error_code = 0;
#if IS_FFMPEG_3_2
// Write video packet (latest version of FFmpeg)
int frameFinished = 0;
int ret = avcodec_send_frame(video_codec, frame_final);
error_code = ret;
if (ret < 0 ) {
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet (Frame not sent)", "", -1, "", -1, "", -1, "", -1, "", -1, "", -1);
if (ret == AVERROR(EAGAIN) )
cerr << "Frame EAGAIN" << "\n";
if (ret == AVERROR_EOF )
cerr << "Frame AVERROR_EOF" << "\n";
avcodec_send_frame(video_codec, NULL);
}
else {
while (ret >= 0) {
ret = avcodec_receive_packet(video_codec, &pkt);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
avcodec_flush_buffers(video_codec);
got_packet_ptr = 0;
break;
}
if (ret == 0) {
got_packet_ptr = 1;
break;
}
}
}
#else
#if LIBAVFORMAT_VERSION_MAJOR >= 54
// Write video packet (older than FFmpeg 3.2)
error_code = avcodec_encode_video2(video_codec, &pkt, frame_final, &got_packet_ptr);
if (error_code != 0 )
cerr << "Frame AVERROR_EOF" << "\n";
if (got_packet_ptr == 0 )
cerr << "Frame gotpacket error" << "\n";
#else
// Write video packet (even older versions of FFmpeg)
int video_outbuf_size = 200000;
video_outbuf = (uint8_t*) av_malloc(200000);
/* encode the image */
int out_size = avcodec_encode_video(video_codec, video_outbuf, video_outbuf_size, frame_final);
/* if zero size, it means the image was buffered */
if (out_size > 0) {
if(video_codec->coded_frame->key_frame)
pkt.flags |= AV_PKT_FLAG_KEY;
pkt.data= video_outbuf;
pkt.size= out_size;
// got data back (so encode this frame)
got_packet_ptr = 1;
}
#endif
#endif
/* if zero size, it means the image was buffered */
if (error_code == 0 && got_packet_ptr) {
// 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_video_count;
// set the timestamp
if (pkt.pts != AV_NOPTS_VALUE)
pkt.pts = av_rescale_q(pkt.pts, video_codec->time_base, video_st->time_base);
if (pkt.dts != AV_NOPTS_VALUE)
pkt.dts = av_rescale_q(pkt.dts, video_codec->time_base, video_st->time_base);
if (pkt.duration > 0)
pkt.duration = av_rescale_q(pkt.duration, video_codec->time_base, video_st->time_base);
pkt.stream_index = video_st->index;
/* write the compressed frame in the media file */
int error_code = av_interleaved_write_frame(oc, &pkt);
if (error_code < 0)
{
ZmqLogger::Instance()->AppendDebugMethod("FFmpegWriter::write_video_packet ERROR [" + (string)av_err2str(error_code) + "]", "error_code", error_code, "", -1, "", -1, "", -1, "", -1, "", -1);
return false;
}
}
// Deallocate memory (if needed)
if (video_outbuf)
delete[] video_outbuf;
// Deallocate packet
AV_FREE_PACKET(&pkt);
}
// Success
return true;
}
// Output the ffmpeg info about this format, streams, and codecs (i.e. dump format)
void FFmpegWriter::OutputStreamInfo()
{
// output debug info
av_dump_format(oc, 0, path.c_str(), 1);
}
// Init a collection of software rescalers (thread safe)
void FFmpegWriter::InitScalers(int source_width, int source_height)
{
// Init software rescalers vector (many of them, one for each thread)
for (int x = 0; x < num_of_rescalers; x++)
{
// Init the software scaler from FFMpeg
img_convert_ctx = sws_getContext(source_width, source_height, PIX_FMT_RGBA, info.width, info.height, AV_GET_CODEC_PIXEL_FORMAT(video_st, video_st->codec), SWS_LANCZOS, NULL, NULL, NULL);
// Add rescaler to vector
image_rescalers.push_back(img_convert_ctx);
}
}
// Set audio resample options
void FFmpegWriter::ResampleAudio(int sample_rate, int channels) {
original_sample_rate = sample_rate;
original_channels = channels;
}
// Remove & deallocate all software scalers
void FFmpegWriter::RemoveScalers()
{
// Close all rescalers
for (int x = 0; x < num_of_rescalers; x++)
sws_freeContext(image_rescalers[x]);
// Clear vector
image_rescalers.clear();
}
AUDIO_PACKET_ENCODING_SIZE
#define AUDIO_PACKET_ENCODING_SIZE
Definition: FFmpegUtilities.h:84
openshot::AUDIO_STREAM
@ AUDIO_STREAM
An audio stream (used to determine which type of stream)
Definition: FFmpegWriter.h:65
openshot::InvalidFormat
Exception when no valid format is found for a file.
Definition: Exceptions.h:142
openshot::WriterInfo::metadata
std::map< string, string > metadata
An optional map/dictionary of video & audio metadata.
Definition: WriterBase.h:76
PIX_FMT_RGB24
#define PIX_FMT_RGB24
Definition: FFmpegUtilities.h:111
AV_FIND_DECODER_CODEC_ID
#define AV_FIND_DECODER_CODEC_ID(av_stream)
Definition: FFmpegUtilities.h:183
openshot::InvalidSampleRate
Exception when invalid sample rate is detected during encoding.
Definition: Exceptions.h:172
openshot::WriterInfo::video_bit_rate
int video_bit_rate
The bit rate of the video stream (in bytes)
Definition: WriterBase.h:60
openshot::InvalidCodec
Exception when no valid codec is found for a file.
Definition: Exceptions.h:122
openshot::FFmpegWriter::ResampleAudio
void ResampleAudio(int sample_rate, int channels)
Set audio resample options.
Definition: FFmpegWriter.cpp:1763
openshot::WriterInfo::vcodec
string vcodec
The name of the video codec used to encode / decode the video stream.
Definition: WriterBase.h:63
openshot::WriterClosed
Exception when a writer is closed, and a frame is requested.
Definition: Exceptions.h:264
AV_COPY_PICTURE_DATA
#define AV_COPY_PICTURE_DATA(av_frame, buffer, pix_fmt, width, height)
Definition: FFmpegUtilities.h:195
openshot::FFmpegWriter::OutputStreamInfo
void OutputStreamInfo()
Output the ffmpeg info about this format, streams, and codecs (i.e. dump format)
Definition: FFmpegWriter.cpp:1742
PixelFormat
#define PixelFormat
Definition: FFmpegUtilities.h:102
AV_ALLOCATE_FRAME
#define AV_ALLOCATE_FRAME()
Definition: FFmpegUtilities.h:176
openshot::FFmpegWriter::SetOption
void SetOption(StreamType stream, string name, string value)
Set custom options (some codecs accept additional params). This must be called after the PrepareStrea...
Definition: FFmpegWriter.cpp:210
openshot::FFmpegWriter::SetVideoOptions
void SetVideoOptions(bool has_video, string codec, Fraction fps, int width, int height, Fraction pixel_ratio, bool interlaced, bool top_field_first, int bit_rate)
Set video export options.
Definition: FFmpegWriter.cpp:114
SWR_CONVERT
#define SWR_CONVERT(ctx, out, linesize, out_count, in, linesize2, in_count)
Definition: FFmpegUtilities.h:126
openshot
This namespace is the default namespace for all code in the openshot library.
Definition: AudioBufferSource.h:45
AV_OPTION_SET
#define AV_OPTION_SET(av_stream, priv_data, name, value, avcodec)
Definition: FFmpegUtilities.h:198
FF_NUM_PROCESSORS
#define FF_NUM_PROCESSORS
Definition: OpenMPUtilities.h:38
openshot::WriterInfo::acodec
string acodec
The name of the audio codec used to encode / decode the video stream.
Definition: WriterBase.h:69
openshot::WriterInfo::audio_bit_rate
int audio_bit_rate
The bit rate of the audio stream (in bytes)
Definition: WriterBase.h:70
openshot::WriterInfo::channels
int channels
The number of audio channels used in the audio stream.
Definition: WriterBase.h:72
openshot::WriterInfo::pixel_ratio
Fraction pixel_ratio
The pixel ratio of the video stream as a fraction (i.e. some pixels are not square)
Definition: WriterBase.h:61
openshot::Fraction
This class represents a fraction.
Definition: Fraction.h:42
AV_GET_CODEC_FROM_STREAM
#define AV_GET_CODEC_FROM_STREAM(av_stream, codec_in)
Definition: FFmpegUtilities.h:190
AV_FREE_FRAME
#define AV_FREE_FRAME(av_frame)
Definition: FFmpegUtilities.h:179
AV_FREE_PACKET
#define AV_FREE_PACKET(av_packet)
Definition: FFmpegUtilities.h:180
openshot::FFmpegWriter::Open
void Open()
Open writer.
Definition: FFmpegWriter.cpp:56
AV_COPY_PARAMS_FROM_CONTEXT
#define AV_COPY_PARAMS_FROM_CONTEXT(av_stream, av_codec)
Definition: FFmpegUtilities.h:205
av_err2str
#define av_err2str(errnum)
Definition: FFmpegUtilities.h:98
openshot::WriterInfo::video_timebase
Fraction video_timebase
The video timebase determines how long each frame stays on the screen.
Definition: WriterBase.h:66
AV_GET_CODEC_PAR_CONTEXT
#define AV_GET_CODEC_PAR_CONTEXT(av_stream, av_codec)
Definition: FFmpegUtilities.h:189
openshot::WriterInfo::width
int width
The width of the video (in pixels)
Definition: WriterBase.h:57
openshot::LAYOUT_MONO
@ LAYOUT_MONO
Definition: ChannelLayouts.h:45
AV_GET_CODEC_ATTRIBUTES
#define AV_GET_CODEC_ATTRIBUTES(av_stream, av_context)
Definition: FFmpegUtilities.h:191
openshot::Fraction::num
int num
Numerator for the fraction.
Definition: Fraction.h:44
openshot::WriterInfo::top_field_first
bool top_field_first
Which interlaced field should be displayed first.
Definition: WriterBase.h:68
openshot::WriterInfo::display_ratio
Fraction display_ratio
The ratio of width to height of the video stream (i.e. 640x480 has a ratio of 4/3)
Definition: WriterBase.h:62
AV_GET_IMAGE_SIZE
#define AV_GET_IMAGE_SIZE(pix_fmt, width, height)
Definition: FFmpegUtilities.h:194
openshot::ErrorEncodingVideo
Exception when encoding audio packet.
Definition: Exceptions.h:101
openshot::Fraction::den
int den
Denominator for the fraction.
Definition: Fraction.h:45
OPEN_MP_NUM_PROCESSORS
#define OPEN_MP_NUM_PROCESSORS
Definition: OpenMPUtilities.h:37
openshot::Fraction::Reduce
void Reduce()
Reduce this fraction (i.e. 640/480 = 4/3)
Definition: Fraction.cpp:71
AV_RESET_FRAME
#define AV_RESET_FRAME(av_frame)
Definition: FFmpegUtilities.h:178
SWR_CLOSE
#define SWR_CLOSE(ctx)
Definition: FFmpegUtilities.h:129
openshot::FFmpegWriter::FFmpegWriter
FFmpegWriter(string path)
Constructor for FFmpegWriter. Throws one of the following exceptions.
Definition: FFmpegWriter.cpp:35
openshot::OutOfMemory
Exception when memory could not be allocated.
Definition: Exceptions.h:224
openshot::FFmpegWriter::SetAudioOptions
void SetAudioOptions(bool has_audio, string codec, int sample_rate, int channels, ChannelLayout channel_layout, int bit_rate)
Set audio export options.
Definition: FFmpegWriter.cpp:172
SWR_INIT
#define SWR_INIT(ctx)
Definition: FFmpegUtilities.h:131
openshot::WriterInfo::fps
Fraction fps
Frames per second, as a fraction (i.e. 24/1 = 24 fps)
Definition: WriterBase.h:59
openshot::VIDEO_STREAM
@ VIDEO_STREAM
A video stream (used to determine which type of stream)
Definition: FFmpegWriter.h:64
openshot::InvalidFile
Exception for files that can not be found or opened.
Definition: Exceptions.h:132
openshot::ZmqLogger::Instance
static ZmqLogger * Instance()
Create or get an instance of this logger singleton (invoke the class with this method)
Definition: ZmqLogger.cpp:38
openshot::WriterInfo::has_video
bool has_video
Determines if this file has a video stream.
Definition: WriterBase.h:51
openshot::FFmpegWriter::IsValidCodec
static bool IsValidCodec(string codec_name)
Determine if codec name is valid.
Definition: FFmpegWriter.cpp:300
openshot::WriterInfo::has_audio
bool has_audio
Determines if this file has an audio stream.
Definition: WriterBase.h:52
PIX_FMT_YUV420P
#define PIX_FMT_YUV420P
Definition: FFmpegUtilities.h:114
AV_GET_CODEC_TYPE
#define AV_GET_CODEC_TYPE(av_stream)
Definition: FFmpegUtilities.h:182
openshot::FFmpegWriter::Close
void Close()
Close the writer.
Definition: FFmpegWriter.cpp:769
openshot::WriterInfo::height
int height
The height of the video (in pixels)
Definition: WriterBase.h:56
AV_FREE_CONTEXT
#define AV_FREE_CONTEXT(av_context)
Definition: FFmpegUtilities.h:181
PIX_FMT_RGBA
#define PIX_FMT_RGBA
Definition: FFmpegUtilities.h:105
openshot::WriterInfo::channel_layout
ChannelLayout channel_layout
The channel layout (mono, stereo, 5 point surround, etc...)
Definition: WriterBase.h:73
AV_GET_CODEC_PIXEL_FORMAT
#define AV_GET_CODEC_PIXEL_FORMAT(av_stream, av_context)
Definition: FFmpegUtilities.h:192
AV_FORMAT_NEW_STREAM
#define AV_FORMAT_NEW_STREAM(oc, st_codec, av_codec, av_st)
Definition: FFmpegUtilities.h:199
SWR_FREE
#define SWR_FREE(ctx)
Definition: FFmpegUtilities.h:130
openshot::FFmpegWriter::WriteTrailer
void WriteTrailer()
Write the file trailer (after all frames are written). This is called automatically by the Close() me...
Definition: FFmpegWriter.cpp:533
PIX_FMT_NONE
#define PIX_FMT_NONE
Definition: FFmpegUtilities.h:108
openshot::ReaderBase
This abstract class is the base class, used by all readers in libopenshot.
Definition: ReaderBase.h:96
openshot::WriterInfo::interlaced_frame
bool interlaced_frame
Are the contents of this frame interlaced.
Definition: WriterBase.h:67
openshot::ReaderBase::GetFrame
virtual std::shared_ptr< Frame > GetFrame(int64_t number)=0
openshot::WriterInfo::sample_rate
int sample_rate
The number of audio samples per second (44100 is a common sample rate)
Definition: WriterBase.h:71
openshot::ZmqLogger::AppendDebugMethod
void AppendDebugMethod(string method_name, string arg1_name, float arg1_value, string arg2_name, float arg2_value, string arg3_name, float arg3_value, string arg4_name, float arg4_value, string arg5_name, float arg5_value, string arg6_name, float arg6_value)
Append debug information.
Definition: ZmqLogger.cpp:162
openshot::InvalidChannels
Exception when an invalid # of audio channels are detected.
Definition: Exceptions.h:112
AV_OPTION_FIND
#define AV_OPTION_FIND(priv_data, name)
Definition: FFmpegUtilities.h:197
openshot::ChannelLayout
ChannelLayout
This enumeration determines the audio channel layout (such as stereo, mono, 5 point surround,...
Definition: ChannelLayouts.h:43
SWR_ALLOC
#define SWR_ALLOC()
Definition: FFmpegUtilities.h:128
AV_REGISTER_ALL
#define AV_REGISTER_ALL
Definition: FFmpegUtilities.h:172
AV_OUTPUT_CONTEXT
#define AV_OUTPUT_CONTEXT(output_context, path)
Definition: FFmpegUtilities.h:196
openshot::FFmpegWriter::WriteFrame
void WriteFrame(std::shared_ptr< Frame > frame)
Add a frame to the stack waiting to be encoded.
Definition: FFmpegWriter.cpp:367
openshot::StreamType
StreamType
This enumeration designates the type of stream when encoding (video or audio)
Definition: FFmpegWriter.h:62
openshot::FFmpegWriter::PrepareStreams
void PrepareStreams()
Prepare & initialize streams and open codecs. This method is called automatically by the Open() metho...
Definition: FFmpegWriter.cpp:312
openshot::InvalidOptions
Exception when invalid encoding options are used.
Definition: Exceptions.h:162
openshot::WriterBase::info
WriterInfo info
Information about the current media file.
Definition: WriterBase.h:93
openshot::NoStreamsFound
Exception when no streams are found in the file.
Definition: Exceptions.h:192
openshot::FFmpegWriter::RemoveScalers
void RemoveScalers()
Remove & deallocate all software scalers.
Definition: FFmpegWriter.cpp:1769
MY_INPUT_BUFFER_PADDING_SIZE
#define MY_INPUT_BUFFER_PADDING_SIZE
Definition: FFmpegUtilities.h:175
AVCODEC_MAX_AUDIO_FRAME_SIZE
#define AVCODEC_MAX_AUDIO_FRAME_SIZE
Definition: FFmpegUtilities.h:78
openshot::FFmpegWriter::WriteHeader
void WriteHeader()
Write the file header (after the options are set). This method is called automatically by the Open() ...
Definition: FFmpegWriter.cpp:333