Mp4Extract.cpp
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上传日期:2015-12-05
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- /*****************************************************************
- |
- | AP4 - MP4 File Processor
- |
- | Copyright 2003 Gilles Boccon-Gibod & Julien Boeuf
- |
- |
- | This file is part of Bento4/AP4 (MP4 Atom Processing Library).
- |
- | Unless you have obtained Bento4 under a difference license,
- | this version of Bento4 is Bento4|GPL.
- | Bento4|GPL 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, or (at your option)
- | any later version.
- |
- | Bento4|GPL 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 Bento4|GPL; see the file COPYING. If not, write to the
- | Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
- | 02111-1307, USA.
- |
- ****************************************************************/
- /*----------------------------------------------------------------------
- | includes
- +---------------------------------------------------------------------*/
- #include <stdio.h>
- #include <stdlib.h>
- #include "Ap4.h"
- #include "Ap4FileByteStream.h"
- #include "Ap4AtomFactory.h"
- #include "Ap4Utils.h"
- /*----------------------------------------------------------------------
- | constants
- +---------------------------------------------------------------------*/
- #define BANNER "MP4 Atom Extractor - Version 0.5an"
- "(c) 2003-2005 Gilles Boccon-Gibod & Julien Boeuf"
-
- /*----------------------------------------------------------------------
- | PrintUsageAndExit
- +---------------------------------------------------------------------*/
- static void
- PrintUsageAndExit()
- {
- fprintf(stderr,
- BANNER
- "nnusage: mp4extract [options] <atom_path> <input> <output>n"
- " options:n"
- " --payload-only : ommit the atom headern");
- exit(1);
- }
- /*----------------------------------------------------------------------
- | main
- +---------------------------------------------------------------------*/
- int
- main(int argc, char** argv)
- {
- if (argc < 4) {
- PrintUsageAndExit();
- }
-
- // parse arguments
- const char* atom_path = NULL;
- const char* input_filename = NULL;
- const char* output_filename = NULL;
- bool payload_only = false;
- char* arg;
- while ((arg = *++argv)) {
- if (!strcmp(arg, "--payload-only")) {
- payload_only = true;
- } else if (atom_path == NULL) {
- atom_path = arg;
- } else if (input_filename == NULL) {
- input_filename = arg;
- } else if (output_filename == NULL) {
- output_filename = arg;
- } else {
- fprintf(stderr, "ERROR: invalid command line argument (%s)n", arg);
- return 1;
- }
- }
- // check arguments
- if (atom_path == NULL) {
- fprintf(stderr, "ERROR: missing atom pathn");
- return 1;
- }
- if (input_filename == NULL) {
- fprintf(stderr, "ERROR: missing input filenamen");
- return 1;
- }
- if (output_filename == NULL) {
- fprintf(stderr, "ERROR: missing output filenamen");
- return 1;
- }
- // create the input stream
- AP4_ByteStream* input;
- try {
- input = new AP4_FileByteStream(input_filename,
- AP4_FileByteStream::STREAM_MODE_READ);
- } catch (AP4_Exception) {
- fprintf(stderr, "ERROR: cannot open input file (%s)n", input_filename);
- return 1;
- }
- // parse the atoms
- AP4_AtomParent top_level;
- AP4_Atom* atom;
- AP4_AtomFactory& atom_factory = AP4_AtomFactory::DefaultFactory;
- while (atom_factory.CreateAtomFromStream(*input, atom) == AP4_SUCCESS) {
- top_level.AddChild(atom);
- }
- // release the input
- input->Release();
- // find the atom
- atom = top_level.FindChild(atom_path);
- if (atom == NULL) {
- fprintf(stderr, "ERROR: atom '%s' not foundn", atom_path);
- return 1;
- }
- // create the output stream
- AP4_ByteStream* output;
- try {
- output = new AP4_FileByteStream(output_filename,
- AP4_FileByteStream::STREAM_MODE_WRITE);
- } catch (AP4_Exception) {
- fprintf(stderr, "ERROR: cannot open output file (%s)n", output_filename);
- return 1;
- }
- // write the atom
- if (payload_only) {
- atom->WriteFields(*output);
- } else {
- atom->Write(*output);
- }
- // cleanup
- output->Release();
- return 0;
- }