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livetrax/gtk2_ardour/transcode_ffmpeg.h

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6.0 KiB
C++

/*
Copyright (C) 2010 Paul Davis
Author: Robin Gareus <robin@gareus.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ardour_transcode_ffmpeg_h__
#define __ardour_transcode_ffmpeg_h__
#include <string>
#include "pbd/system_exec.h"
#include "ardour/types.h"
/** @class TranscodeFfmpeg
* @brief wrapper around ffmpeg and ffprobe command-line utils
*
* This class includes parsers for stdi/o communication with
* 'ffmpeg' and 'ffprobe' and provide an abstraction to
* transcode video-files and extract aufio tracks and query
* file information.
*/
class TranscodeFfmpeg : public sigc::trackable
, public PBD::ScopedConnectionList
{
public:
struct FFAudioStream {
std::string name;
std::string stream_id;
uint32_t channels;
};
typedef std::vector<FFAudioStream> FFAudioStreams;
typedef std::map<std::string,std::string> FFSettings;
/** instantiate a new transcoder. If a file-name is given, the file's
* attributes (fps, duration, geometry etc) are read.
*
* @param f path to the video-file to probe or use as input for
* \ref extract_audio and \ref transcode.
*/
TranscodeFfmpeg (std::string f);
virtual ~TranscodeFfmpeg ();
/** transcode/import a video-file
* @param outfile full-path (incl. file-extension)
* @param outwidth video-width, \c <0 no scaling)
* @param outheight video-height \c <0 use aspect \c \ref outwidth /c / \c aspect-ratio
* @param kbitps video bitrate \c 0 calculate to use 0.7 bits per pixel on average
* @return \c true if the transcoder process was successfully started.
*/
bool transcode (std::string, const int outwidth=0, const int outheight=0, const int kbitps =0);
/** Extract an audio track from the given input file to a new 32bit float little-endian PCM WAV file.
* @param outfile full-path (incl. file-extension) to .wav file to write
* @param samplerate target samplerate
* @param stream Stream-ID of the audio-track to extract
* specified as element-number in \ref get_audio().
* @return \c true if the transcoder process was successfully started.
*/
bool extract_audio (std::string outfile, ARDOUR::framecnt_t samplerate, unsigned int stream=0);
/** transcode video and mux audio files into a new video-file.
* @param outfile full-path of output file to create (existing files are overwritten)
* @param inf_a filename of input audio-file
* @param inf_v filename of input video-file
* @param ffs additional command-line parameters for 'ffmpeg'. key/value pairs
* eg ffs["-vcodec"] = "mpeg4"
* @param meta additional meta-data results in -metadata "<key>"="<value>" command-line
* arguments
* @param map if set to \c true stream mapping from input streams to output streams is set to use
* only the first available stream from the audio & video file (-map 0.0 -map 1.0).
* @return \c true if the encoder process was successfully started.
*/
bool encode (std::string outfile, std::string inf_a, std::string inf_v, FFSettings ffs, FFSettings meta, bool map = true);
/** @return array with default encoder settings */
FFSettings default_encoder_settings ();
/** @return array with default meta data */
FFSettings default_meta_data ();
/** abort any running transcoding process */
void cancel();
/**
* @return \c true if the input file was parsed correctly on class creation. */
bool probe_ok () { return probeok; }
/** @return \c true if the ffmpeg/ffparse executables are avail on this system */
bool ffexec_ok () { return ffexecok; }
/** signal emitted when ffmpeg reports progress updates
* during \ref encode \ref transcode and \ref extract_audio
* The parameters are current and last video-frame.
*/
PBD::Signal2<void, ARDOUR::framecnt_t, ARDOUR::framecnt_t> Progress;
/** signal emitted when the transcoder process terminates. */
PBD::Signal0<void> Finished;
double get_fps () { return m_fps; }
double get_aspect () { return m_aspect; }
int get_width() { return m_width; }
int get_height() { return m_height; }
ARDOUR::framecnt_t get_duration() { return m_duration; }
std::string get_codec() { return m_codec; }
FFAudioStreams get_audio() { return m_audio; }
/** override file duration used with the \ref Progress signal.
* @param d duration in video-frames = length_in_seconds * get_fps()
*/
void set_duration(ARDOUR::framecnt_t d) { m_duration = d; }
/* offset, lead-in/out are in seconds */
void set_avoffset(double av_offset) { m_avoffset = av_offset; }
void set_leadinout(double lead_in, double lead_out) { m_lead_in = lead_in; m_lead_out = lead_out; }
#if 1 /* tentative debug mode */
void set_debug (bool onoff) { debug_enable = onoff; }
#endif
protected:
std::string infile;
PBD::SystemExec *ffcmd;
bool probe ();
double m_fps;
double m_aspect;
ARDOUR::framecnt_t m_duration;
int m_width;
int m_height;
std::string m_codec;
int m_videoidx;
double m_avoffset;
double m_lead_in;
double m_lead_out;
bool ffexecok;
bool probeok;
FFAudioStreams m_audio;
char *format_metadata (std::string, std::string);
void ffmpegparse_v (std::string d, size_t s);
void ffmpegparse_a (std::string d, size_t s);
void ffprobeparse (std::string d, size_t s);
void ffexit ();
std::string ffoutput;
std::string ffmpeg_exe;
std::string ffprobe_exe;
#if 1 /* tentative debug mode */
bool debug_enable;
#endif
};
#endif /* __ardour_transcode_ffmpeg_h__ */