java用ffmpeg截取视频图片

/* * JAVE - A Java Audio/Video Encoder (based on FFMPEG) * * Copyright (C) 2008-2009 Carlo Pelliccia (www.sauronsoftware.it) * * 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 3 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, see <http://www.gnu.org/licenses/>. */ package it.sauronsoftware.jave; import java.io.File; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.util.ArrayList; import java.util.Hashtable; import java.util.StringTokenizer; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * Main class of the package. Instances can encode audio and video streams. * * @author Carlo Pelliccia */ public class Encoder { /** * This regexp is used to parse the ffmpeg output about the supported * formats. */ private static final Pattern FORMAT_PATTERN = Pattern .compile("^\\s*([D ])([E ])\\s+([\\w,]+)\\s+.+$"); /** * This regexp is used to parse the ffmpeg output about the included * encoders/decoders. */ private static final Pattern ENCODER_DECODER_PATTERN = Pattern.compile( "^\\s*([D ])([E ])([AVS]).{3}\\s+(.+)$", Pattern.CASE_INSENSITIVE); /** * This regexp is used to parse the ffmpeg output about the ongoing encoding * process. */ private static final Pattern PROGRESS_INFO_PATTERN = Pattern.compile( "\\s*(\\w+)\\s*=\\s*(\\S+)\\s*", Pattern.CASE_INSENSITIVE); /** * This regexp is used to parse the ffmpeg output about the size of a video * stream. */ private static final Pattern SIZE_PATTERN = Pattern.compile( "(\\d+)x(\\d+)", Pattern.CASE_INSENSITIVE); /** * This regexp is used to parse the ffmpeg output about the frame rate value * of a video stream. */ private static final Pattern FRAME_RATE_PATTERN = Pattern.compile( "([\\d.]+)\\s+(?:fps|tb\\(r\\))", Pattern.CASE_INSENSITIVE); /** * This regexp is used to parse the ffmpeg output about the bit rate value * of a stream. */ private static final Pattern BIT_RATE_PATTERN = Pattern.compile( "(\\d+)\\s+kb/s", Pattern.CASE_INSENSITIVE); /** * This regexp is used to parse the ffmpeg output about the sampling rate of * an audio stream. */ private static final Pattern SAMPLING_RATE_PATTERN = Pattern.compile( "(\\d+)\\s+Hz", Pattern.CASE_INSENSITIVE); /** * This regexp is used to parse the ffmpeg output about the channels number * of an audio stream. */ private static final Pattern CHANNELS_PATTERN = Pattern.compile( "(mono|stereo)", Pattern.CASE_INSENSITIVE); /** * This regexp is used to parse the ffmpeg output about the success of an * encoding operation. */ private static final Pattern SUCCESS_PATTERN = Pattern.compile( "^\\s*video\\:\\S+\\s+audio\\:\\S+\\s+global headers\\:\\S+.*$", Pattern.CASE_INSENSITIVE); /** * The locator of the ffmpeg executable used by this encoder. */ private FFMPEGLocator locator; /** * It builds an encoder using a {@link DefaultFFMPEGLocator} instance to * locate the ffmpeg executable to use. */ public Encoder() { this.locator = new DefaultFFMPEGLocator(); } /** * It builds an encoder with a custom {@link FFMPEGLocator}. * * @param locator * The locator picking up the ffmpeg executable used by the * encoder. */ public Encoder(FFMPEGLocator locator) { this.locator = locator; } /** * Returns a list with the names of all the audio decoders bundled with the * ffmpeg distribution in use. An audio stream can be decoded only if a * decoder for its format is available. * * @return A list with the names of all the included audio decoders. * @throws EncoderException * If a problem occurs calling the underlying ffmpeg executable. */ public String[] getAudioDecoders() throws EncoderException { ArrayList res = new ArrayList(); FFMPEGExecutor ffmpeg = locator.createExecutor(); ffmpeg.addArgument("-formats"); try { ffmpeg.execute(); RBufferedReader reader = null; reader = new RBufferedReader(new InputStreamReader(ffmpeg .getInputStream())); String line; boolean evaluate = false; while ((line = reader.readLine()) != null) { if (line.trim().length() == 0) { continue; } if (evaluate) { Matcher matcher = ENCODER_DECODER_PATTERN.matcher(line); if (matcher.matches()) { String decoderFlag = matcher.group(1); String audioVideoFlag = matcher.group(3); if ("D".equals(decoderFlag) && "A".equals(audioVideoFlag)) { String name = matcher.group(4); res.add(name); } } else { break; } } else if (line.trim().equals("Codecs:")) { evaluate = true; } } } catch (IOException e) { throw new EncoderException(e); } finally { ffmpeg.destroy(); } int size = res.size(); String[] ret = new String[size]; for (int i = 0; i < size; i++) { ret[i] = (String) res.get(i); } return ret; } /** * Returns a list with the names of all the audio encoders bundled with the * ffmpeg distribution in use. An audio stream can be encoded using one of * these encoders. * * @return A list with the names of all the included audio encoders. * @throws EncoderException * If a problem occurs calling the underlying ffmpeg executable. */ public String[] getAudioEncoders() throws EncoderException { ArrayList res = new ArrayList(); FFMPEGExecutor ffmpeg = locator.createExecutor(); ffmpeg.addArgument("-formats"); try { ffmpeg.execute(); RBufferedReader reader = null; reader = new RBufferedReader(new InputStreamReader(ffmpeg .getInputStream())); String line; boolean evaluate = false; while ((line = reader.readLine()) != null) { if (line.trim().length() == 0) { continue; } if (evaluate) { Matcher matcher = ENCODER_DECODER_PATTERN.matcher(line); if (matcher.matches()) { String encoderFlag = matcher.group(2); String audioVideoFlag = matcher.group(3); if ("E".equals(encoderFlag) && "A".equals(audioVideoFlag)) { String name = matcher.group(4); res.add(name); } } else { break; } } else if (line.trim().equals("Codecs:")) { evaluate = true; } } } catch (IOException e) { throw new EncoderException(e); } finally { ffmpeg.destroy(); } int size = res.size(); String[] ret = new String[size]; for (int i = 0; i < size; i++) { ret[i] = (String) res.get(i); } return ret; } /** * Returns a list with the names of all the video decoders bundled with the * ffmpeg distribution in use. A video stream can be decoded only if a * decoder for its format is available. * * @return A list with the names of all the included video decoders. * @throws EncoderException * If a problem occurs calling the underlying ffmpeg executable. */ public String[] getVideoDecoders() throws EncoderException { ArrayList res = new ArrayList(); FFMPEGExecutor ffmpeg = locator.createExecutor(); ffmpeg.addArgument("-formats"); try { ffmpeg.execute(); RBufferedReader reader = null; reader = new RBufferedReader(new InputStreamReader(ffmpeg .ge