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BoofCV is an open source Java library for real-time computer vision and robotics applications.
/*
* Copyright (c) 2011-2017, Peter Abeles. All Rights Reserved.
*
* This file is part of BoofCV (http://boofcv.org).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Copyright (C) 2009-2017 Samuel Audet
*
* Licensed either under the Apache License, Version 2.0, or (at your option)
* under the terms of the GNU General Public License as published by
* the Free Software Foundation (subject to the "Classpath" exception),
* either version 2, or any later version (collectively, the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
* http://www.gnu.org/licenses/
* http://www.gnu.org/software/classpath/license.html
*
* or as provided in the LICENSE.txt file that accompanied this code.
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*
* Based on the avcodec_sample.0.5.0.c file available at
* http://web.me.com/dhoerl/Home/Tech_Blog/Entries/2009/1/22_Revised_avcodec_sample.c_files/avcodec_sample.0.5.0.c
* by Martin Böhme, Stephen Dranger, and David Hoerl
* as well as on the decoding_encoding.c file included in FFmpeg 0.11.1,
* which is covered by the following copyright notice:
*
* Copyright (c) 2001 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.bytedeco.copiedstuff;
import org.bytedeco.javacpp.*;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map.Entry;
import static org.bytedeco.javacpp.avcodec.*;
import static org.bytedeco.javacpp.avdevice.avdevice_register_all;
import static org.bytedeco.javacpp.avformat.*;
import static org.bytedeco.javacpp.avutil.*;
import static org.bytedeco.javacpp.swscale.*;
/**
*
* @author Samuel Audet
*/
public class FFmpegFrameGrabber extends FrameGrabber {
public static String[] getDeviceDescriptions() throws Exception {
tryLoad();
throw new UnsupportedOperationException("Device enumeration not support by FFmpeg.");
}
public static FFmpegFrameGrabber createDefault(File deviceFile) throws Exception { return new FFmpegFrameGrabber(deviceFile); }
public static FFmpegFrameGrabber createDefault(String devicePath) throws Exception { return new FFmpegFrameGrabber(devicePath); }
public static FFmpegFrameGrabber createDefault(int deviceNumber) throws Exception { throw new Exception(FFmpegFrameGrabber.class + " does not support device numbers."); }
private static Exception loadingException = null;
public static void tryLoad() throws Exception {
if (loadingException != null) {
throw loadingException;
} else {
try {
Loader.load(org.bytedeco.javacpp.avutil.class);
Loader.load(org.bytedeco.javacpp.swresample.class);
Loader.load(org.bytedeco.javacpp.avcodec.class);
Loader.load(org.bytedeco.javacpp.avformat.class);
Loader.load(org.bytedeco.javacpp.swscale.class);
// Register all formats and codecs
avcodec_register_all();
av_register_all();
avformat_network_init();
Loader.load(org.bytedeco.javacpp.avdevice.class);
avdevice_register_all();
} catch (Throwable t) {
if (t instanceof Exception) {
throw loadingException = (Exception)t;
} else {
throw loadingException = new Exception("Failed to load " + FFmpegFrameGrabber.class, t);
}
}
}
}
static {
try {
tryLoad();
} catch (Exception ex) { }
}
public FFmpegFrameGrabber(File file) {
this(file.getAbsolutePath());
}
public FFmpegFrameGrabber(String filename) {
this.filename = filename;
}
public FFmpegFrameGrabber(InputStream inputStream) {
this.inputStream = inputStream;
}
public void release() throws Exception {
synchronized (org.bytedeco.javacpp.avcodec.class) {
releaseUnsafe();
}
}
void releaseUnsafe() throws Exception {
if (pkt != null && pkt2 != null) {
if (pkt2.size() > 0) {
av_packet_unref(pkt);
}
pkt = pkt2 = null;
}
// Free the RGB image
if (image_ptr != null) {
for (int i = 0; i < image_ptr.length; i++) {
av_free(image_ptr[i]);
}
image_ptr = null;
}
if (picture_rgb != null) {
av_frame_free(picture_rgb);
picture_rgb = null;
}
// Free the native format picture frame
if (picture != null) {
av_frame_free(picture);
picture = null;
}
// Close the video codec
if (video_c != null) {
avcodec_free_context(video_c);
video_c = null;
}
// Free the audio samples frame
if (samples_frame != null) {
av_frame_free(samples_frame);
samples_frame = null;
}
// Close the audio codec
if (audio_c != null) {
avcodec_free_context(audio_c);
audio_c = null;
}
// Close the video file
if (inputStream == null && oc != null && !oc.isNull()) {
avformat_close_input(oc);
oc = null;
}
if (img_convert_ctx != null) {
sws_freeContext(img_convert_ctx);
img_convert_ctx = null;
}
got_frame = null;
frameGrabbed = false;
frame = null;
timestamp = 0;
frameNumber = 0;
if (inputStream != null) {
try {
if (oc == null) {
// when called a second time
inputStream.close();
} else {
inputStream.reset();
}
} catch (IOException ex) {
throw new Exception("Error on InputStream.close(): ", ex);
} finally {
inputStreams.remove(oc);
if (avio != null) {
if (avio.buffer() != null) {
av_free(avio.buffer());
avio.buffer(null);
}
av_free(avio);
avio = null;
}
if (oc != null) {
avformat_free_context(oc);
oc = null;
}
}
}
}
@Override protected void finalize() throws Throwable {
super.finalize();
release();
}
static HashMap inputStreams = new HashMap();
static class ReadCallback extends Read_packet_Pointer_BytePointer_int {
@Override public int call(Pointer opaque, BytePointer buf, int buf_size) {
try {
byte[] b = new byte[buf_size];
InputStream is = inputStreams.get(opaque);
int size = is.read(b, 0, buf_size);
if (size < 0) {
return 0;
} else {
buf.put(b, 0, size);
return size;
}
}
catch (Throwable t) {
System.err.println("Error on InputStream.read(): " + t);
return -1;
}
}
}
static class SeekCallback extends Seek_Pointer_long_int {
@Override public long call(Pointer opaque, long offset, int whence) {
try {
InputStream is = inputStreams.get(opaque);
switch (whence) {
case 0: is.reset(); break;
case 1: break;
default: return -1;
}
is.skip(offset);
return 0;
} catch (Throwable t) {
System.err.println("Error on InputStream.reset() or skip(): " + t);
return -1;
}
}
}
static ReadCallback readCallback;
static SeekCallback seekCallback;
private InputStream inputStream;
private AVIOContext avio;
private String filename;
private AVFormatContext oc;
private AVStream video_st, audio_st;
private AVCodecContext video_c, audio_c;
private AVFrame picture, picture_rgb;
private BytePointer[] image_ptr;
private Buffer[] image_buf;
private AVFrame samples_frame;
private BytePointer[] samples_ptr;
private Buffer[] samples_buf;
private AVPacket pkt, pkt2;
private int sizeof_pkt;
private int[] got_frame;
private SwsContext img_convert_ctx;
private boolean frameGrabbed;
private Frame frame;
@Override public double getGamma() {
// default to a gamma of 2.2 for cheap Webcams, DV cameras, etc.
if (gamma == 0.0) {
return 2.2;
} else {
return gamma;
}
}
@Override public String getFormat() {
if (oc == null) {
return super.getFormat();
} else {
return oc.iformat().name().getString();
}
}
@Override public int getImageWidth() {
return imageWidth > 0 || video_c == null ? super.getImageWidth() : video_c.width();
}
@Override public int getImageHeight() {
return imageHeight > 0 || video_c == null ? super.getImageHeight() : video_c.height();
}
@Override public int getAudioChannels() {
return audio_c == null ? super.getAudioChannels() : audio_c.channels();
}
@Override public int getPixelFormat() {
if (imageMode == ImageMode.COLOR || imageMode == ImageMode.GRAY) {
if (pixelFormat == AV_PIX_FMT_NONE) {
return imageMode == ImageMode.COLOR ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_GRAY8;
} else {
return pixelFormat;
}
} else if (video_c != null) { // RAW
return video_c.pix_fmt();
} else {
return super.getPixelFormat();
}
}
@Override public int getVideoCodec() {
return video_c == null ? super.getVideoCodec() : video_c.codec_id();
}
@Override public int getVideoBitrate() {
return video_c == null ? super.getVideoBitrate() : (int)video_c.bit_rate();
}
@Override public double getAspectRatio() {
if (video_st == null) {
return super.getAspectRatio();
} else {
AVRational r = av_guess_sample_aspect_ratio(oc, video_st, picture);
double a = (double)r.num() / r.den();
return a == 0.0 ? 1.0 : a;
}
}
@Override public double getFrameRate() {
if (video_st == null) {
return super.getFrameRate();
} else {
AVRational r = video_st.avg_frame_rate();
if (r.num() == 0 && r.den() == 0) {
r = video_st.r_frame_rate();
}
return (double)r.num() / r.den();
}
}
@Override public int getAudioCodec() {
return audio_c == null ? super.getAudioCodec() : audio_c.codec_id();
}
@Override public int getAudioBitrate() {
return audio_c == null ? super.getAudioBitrate() : (int)audio_c.bit_rate();
}
@Override public int getSampleFormat() {
return audio_c == null ? super.getSampleFormat() : audio_c.sample_fmt();
}
@Override public int getSampleRate() {
return audio_c == null ? super.getSampleRate() : audio_c.sample_rate();
}
@Override public String getMetadata(String key) {
if (oc == null) {
return super.getMetadata(key);
}
AVDictionaryEntry entry = av_dict_get(oc.metadata(), key, null, 0);
return entry == null || entry.value() == null ? null : entry.value().getString();
}
@Override public String getVideoMetadata(String key) {
if (video_st == null) {
return super.getVideoMetadata(key);
}
AVDictionaryEntry entry = av_dict_get(video_st.metadata(), key, null, 0);
return entry == null || entry.value() == null ? null : entry.value().getString();
}
@Override public String getAudioMetadata(String key) {
if (audio_st == null) {
return super.getAudioMetadata(key);
}
AVDictionaryEntry entry = av_dict_get(audio_st.metadata(), key, null, 0);
return entry == null || entry.value() == null ? null : entry.value().getString();
}
@Override public void setFrameNumber(int frameNumber) throws Exception {
// best guess, AVSEEK_FLAG_FRAME has not been implemented in FFmpeg...
setTimestamp(Math.round(1000000L * frameNumber / getFrameRate()));
}
@Override public void setTimestamp(long timestamp) throws Exception {
int ret;
if (oc == null) {
super.setTimestamp(timestamp);
} else {
timestamp = timestamp * AV_TIME_BASE / 1000000L;
/* add the stream start time */
if (oc.start_time() != AV_NOPTS_VALUE) {
timestamp += oc.start_time();
}
if ((ret = avformat_seek_file(oc, -1, Long.MIN_VALUE, timestamp, Long.MAX_VALUE, AVSEEK_FLAG_BACKWARD)) < 0) {
throw new Exception("avformat_seek_file() error " + ret + ": Could not seek file to timestamp " + timestamp + ".");
}
if (video_c != null) {
avcodec_flush_buffers(video_c);
}
if (audio_c != null) {
avcodec_flush_buffers(audio_c);
}
if (pkt2.size() > 0) {
pkt2.size(0);
av_packet_unref(pkt);
}
/* comparing to timestamp +/- 1 avoids rouding issues for framerates
which are no proper divisors of 1000000, e.g. where
av_frame_get_best_effort_timestamp in grabFrame sets this.timestamp
to ...666 and the given timestamp has been rounded to ...667
(or vice versa)
*/
while (this.timestamp > timestamp + 1 && grabFrame(false, true, false, false) != null) {
// flush frames if seeking backwards
}
while (this.timestamp < timestamp - 1 && grabFrame(false, true, false, false) != null) {
// decode up to the desired frame
}
if (video_c != null) {
frameGrabbed = true;
}
}
}
@Override public int getLengthInFrames() {
// best guess...
return (int)(getLengthInTime() * getFrameRate() / 1000000L);
}
@Override public long getLengthInTime() {
return oc.duration() * 1000000L / AV_TIME_BASE;
}
public AVFormatContext getFormatContext() {
return oc;
}
public void start() throws Exception {
synchronized (org.bytedeco.javacpp.avcodec.class) {
startUnsafe();
}
}
void startUnsafe() throws Exception {
int ret;
img_convert_ctx = null;
oc = new AVFormatContext(null);
video_c = null;
audio_c = null;
pkt = new AVPacket();
pkt2 = new AVPacket();
sizeof_pkt = pkt.sizeof();
got_frame = new int[1];
frameGrabbed = false;
frame = new Frame();
timestamp = 0;
frameNumber = 0;
pkt2.size(0);
// Open video file
AVInputFormat f = null;
if (format != null && format.length() > 0) {
if ((f = av_find_input_format(format)) == null) {
throw new Exception("av_find_input_format() error: Could not find input format \"" + format + "\".");
}
}
AVDictionary options = new AVDictionary(null);
if (frameRate > 0) {
AVRational r = av_d2q(frameRate, 1001000);
av_dict_set(options, "framerate", r.num() + "/" + r.den(), 0);
}
if (pixelFormat >= 0) {
av_dict_set(options, "pixel_format", av_get_pix_fmt_name(pixelFormat).getString(), 0);
} else if (imageMode != ImageMode.RAW) {
av_dict_set(options, "pixel_format", imageMode == ImageMode.COLOR ? "bgr24" : "gray8", 0);
}
if (imageWidth > 0 && imageHeight > 0) {
av_dict_set(options, "video_size", imageWidth + "x" + imageHeight, 0);
}
if (sampleRate > 0) {
av_dict_set(options, "sample_rate", "" + sampleRate, 0);
}
if (audioChannels > 0) {
av_dict_set(options, "channels", "" + audioChannels, 0);
}
for (Entry e : this.options.entrySet()) {
av_dict_set(options, e.getKey(), e.getValue(), 0);
}
if (inputStream != null) {
if (readCallback == null) {
readCallback = new ReadCallback();
}
if (seekCallback == null) {
seekCallback = new SeekCallback();
}
if (!inputStream.markSupported()) {
inputStream = new BufferedInputStream(inputStream, 1024 * 1024);
}
inputStream.mark(1024 * 1024);
oc = avformat_alloc_context();
avio = avio_alloc_context(new BytePointer(av_malloc(4096)), 4096, 0, oc, readCallback, null, seekCallback);
oc.pb(avio);
filename = inputStream.toString();
inputStreams.put(oc, inputStream);
}
if ((ret = avformat_open_input(oc, filename, f, options)) < 0) {
av_dict_set(options, "pixel_format", null, 0);
if ((ret = avformat_open_input(oc, filename, f, options)) < 0) {
throw new Exception("avformat_open_input() error " + ret + ": Could not open input \"" + filename + "\". (Has setFormat() been called?)");
}
}
av_dict_free(options);
// Retrieve stream information
if ((ret = avformat_find_stream_info(oc, (PointerPointer)null)) < 0) {
throw new Exception("avformat_find_stream_info() error " + ret + ": Could not find stream information.");
}
// Dump information about file onto standard error
av_dump_format(oc, 0, filename, 0);
// Find the first video and audio stream, unless the user specified otherwise
video_st = audio_st = null;
AVCodecParameters video_par = null, audio_par = null;
int nb_streams = oc.nb_streams();
for (int i = 0; i < nb_streams; i++) {
AVStream st = oc.streams(i);
// Get a pointer to the codec context for the video or audio stream
AVCodecParameters par = st.codecpar();
if (video_st == null && par.codec_type() == AVMEDIA_TYPE_VIDEO && (videoStream < 0 || videoStream == i)) {
video_st = st;
video_par = par;
} else if (audio_st == null && par.codec_type() == AVMEDIA_TYPE_AUDIO && (audioStream < 0 || audioStream == i)) {
audio_st = st;
audio_par = par;
}
}
if (video_st == null && audio_st == null) {
throw new Exception("Did not find a video or audio stream inside \"" + filename
+ "\" for videoStream == " + videoStream + " and audioStream == " + audioStream + ".");
}
if (video_st != null) {
// Find the decoder for the video stream
AVCodec codec = avcodec_find_decoder(video_par.codec_id());
if (codec == null) {
throw new Exception("avcodec_find_decoder() error: Unsupported video format or codec not found: " + video_par.codec_id() + ".");
}
/* Allocate a codec context for the decoder */
if ((video_c = avcodec_alloc_context3(codec)) == null) {
throw new Exception("avcodec_alloc_context3() error: Could not allocate video decoding context.");
}
/* copy the stream parameters from the muxer */
if ((ret = avcodec_parameters_to_context(video_c, video_st.codecpar())) < 0) {
release();
throw new Exception("avcodec_parameters_to_context() error: Could not copy the video stream parameters.");
}
options = new AVDictionary(null);
for (Entry e : videoOptions.entrySet()) {
av_dict_set(options, e.getKey(), e.getValue(), 0);
}
// Open video codec
if ((ret = avcodec_open2(video_c, codec, options)) < 0) {
throw new Exception("avcodec_open2() error " + ret + ": Could not open video codec.");
}
av_dict_free(options);
// Hack to correct wrong frame rates that seem to be generated by some codecs
if (video_c.time_base().num() > 1000 && video_c.time_base().den() == 1) {
video_c.time_base().den(1000);
}
// Allocate video frame and an AVFrame structure for the RGB image
if ((picture = av_frame_alloc()) == null) {
throw new Exception("av_frame_alloc() error: Could not allocate raw picture frame.");
}
if ((picture_rgb = av_frame_alloc()) == null) {
throw new Exception("av_frame_alloc() error: Could not allocate RGB picture frame.");
}
int width = imageWidth > 0 ? imageWidth : video_c.width();
int height = imageHeight > 0 ? imageHeight : video_c.height();
switch (imageMode) {
case COLOR:
case GRAY:
int fmt = getPixelFormat();
// Determine required buffer size and allocate buffer
int size = av_image_get_buffer_size(fmt, width, height, 1);
image_ptr = new BytePointer[] { new BytePointer(av_malloc(size)).capacity(size) };
image_buf = new Buffer[] { image_ptr[0].asBuffer() };
// Assign appropriate parts of buffer to image planes in picture_rgb
// Note that picture_rgb is an AVFrame, but AVFrame is a superset of AVPicture
av_image_fill_arrays(new PointerPointer(picture_rgb), picture_rgb.linesize(), image_ptr[0], fmt, width, height, 1);
picture_rgb.format(fmt);
picture_rgb.width(width);
picture_rgb.height(height);
break;
case RAW:
image_ptr = new BytePointer[] { null };
image_buf = new Buffer[] { null };
break;
default:
assert false;
}
}
if (audio_st != null) {
// Find the decoder for the audio stream
AVCodec codec = avcodec_find_decoder(audio_par.codec_id());
if (codec == null) {
throw new Exception("avcodec_find_decoder() error: Unsupported audio format or codec not found: " + audio_par.codec_id() + ".");
}
/* Allocate a codec context for the decoder */
if ((audio_c = avcodec_alloc_context3(codec)) == null) {
throw new Exception("avcodec_alloc_context3() error: Could not allocate audio decoding context.");
}
/* copy the stream parameters from the muxer */
if ((ret = avcodec_parameters_to_context(audio_c, audio_st.codecpar())) < 0) {
release();
throw new Exception("avcodec_parameters_to_context() error: Could not copy the audio stream parameters.");
}
options = new AVDictionary(null);
for (Entry e : audioOptions.entrySet()) {
av_dict_set(options, e.getKey(), e.getValue(), 0);
}
// Open audio codec
if ((ret = avcodec_open2(audio_c, codec, options)) < 0) {
throw new Exception("avcodec_open2() error " + ret + ": Could not open audio codec.");
}
av_dict_free(options);
// Allocate audio samples frame
if ((samples_frame = av_frame_alloc()) == null) {
throw new Exception("av_frame_alloc() error: Could not allocate audio frame.");
}
}
}
public void stop() throws Exception {
release();
}
public void trigger() throws Exception {
if (oc == null || oc.isNull()) {
throw new Exception("Could not trigger: No AVFormatContext. (Has start() been called?)");
}
if (pkt2.size() > 0) {
pkt2.size(0);
av_packet_unref(pkt);
}
for (int i = 0; i < numBuffers+1; i++) {
if (av_read_frame(oc, pkt) < 0) {
return;
}
av_packet_unref(pkt);
}
}
private void processImage() throws Exception {
frame.imageWidth = imageWidth > 0 ? imageWidth : video_c.width();
frame.imageHeight = imageHeight > 0 ? imageHeight : video_c.height();
frame.imageDepth = Frame.DEPTH_UBYTE;
switch (imageMode) {
case COLOR:
case GRAY:
// Deinterlace Picture
if (deinterlace) {
throw new Exception("Cannot deinterlace: Functionality moved to FFmpegFrameFilter.");
}
// Convert the image into BGR or GRAY format that OpenCV uses
img_convert_ctx = sws_getCachedContext(img_convert_ctx,
video_c.width(), video_c.height(), video_c.pix_fmt(),
frame.imageWidth, frame.imageHeight, getPixelFormat(), SWS_BILINEAR,
null, null, (DoublePointer)null);
if (img_convert_ctx == null) {
throw new Exception("sws_getCachedContext() error: Cannot initialize the conversion context.");
}
// Convert the image from its native format to RGB or GRAY
sws_scale(img_convert_ctx, new PointerPointer(picture), picture.linesize(), 0,
video_c.height(), new PointerPointer(picture_rgb), picture_rgb.linesize());
frame.imageStride = picture_rgb.linesize(0);
frame.image = image_buf;
break;
case RAW:
frame.imageStride = picture.linesize(0);
BytePointer ptr = picture.data(0);
if (ptr != null && !ptr.equals(image_ptr[0])) {
image_ptr[0] = ptr.capacity(frame.imageHeight * frame.imageStride);
image_buf[0] = ptr.asBuffer();
}
frame.image = image_buf;
break;
default:
assert false;
}
frame.image[0].limit(frame.imageHeight * frame.imageStride);
frame.imageChannels = frame.imageStride / frame.imageWidth;
}
public Frame grab() throws Exception {
return grabFrame(true, true, true, false);
}
public Frame grabImage() throws Exception {
return grabFrame(false, true, true, false);
}
public Frame grabSamples() throws Exception {
return grabFrame(true, false, true, false);
}
public Frame grabKeyFrame() throws Exception {
return grabFrame(false, true, true, true);
}
public Frame grabFrame(boolean doAudio, boolean doVideo, boolean processImage, boolean keyFrames) throws Exception {
if (oc == null || oc.isNull()) {
throw new Exception("Could not grab: No AVFormatContext. (Has start() been called?)");
} else if ((!doVideo || video_st == null) && (!doAudio || audio_st == null)) {
return null;
}
frame.keyFrame = false;
frame.imageWidth = 0;
frame.imageHeight = 0;
frame.imageDepth = 0;
frame.imageChannels = 0;
frame.imageStride = 0;
frame.image = null;
frame.sampleRate = 0;
frame.audioChannels = 0;
frame.samples = null;
frame.opaque = null;
if (doVideo && frameGrabbed) {
frameGrabbed = false;
if (processImage) {
processImage();
}
frame.keyFrame = picture.key_frame() != 0;
frame.image = image_buf;
frame.opaque = picture;
return frame;
}
boolean done = false;
while (!done) {
if (pkt2.size() <= 0) {
if (av_read_frame(oc, pkt) < 0) {
if (doVideo && video_st != null) {
// The video codec may have buffered some frames
pkt.stream_index(video_st.index());
pkt.flags(AV_PKT_FLAG_KEY);
pkt.data(null);
pkt.size(0);
} else {
return null;
}
}
}
// Is this a packet from the video stream?
if (doVideo && video_st != null && pkt.stream_index() == video_st.index()
&& (!keyFrames || pkt.flags() == AV_PKT_FLAG_KEY)) {
// Decode video frame
int len = avcodec_decode_video2(video_c, picture, got_frame, pkt);
// Did we get a video frame?
if (len >= 0 && got_frame[0] != 0
&& (!keyFrames || picture.pict_type() == AV_PICTURE_TYPE_I)) {
long pts = av_frame_get_best_effort_timestamp(picture);
AVRational time_base = video_st.time_base();
timestamp = 1000000L * pts * time_base.num() / time_base.den();
// best guess, AVCodecContext.frame_number = number of decoded frames...
frameNumber = (int)(timestamp * getFrameRate() / 1000000L);
if (processImage) {
processImage();
}
done = true;
frame.keyFrame = picture.key_frame() != 0;
frame.image = image_buf;
frame.opaque = picture;
} else if (pkt.data() == null && pkt.size() == 0) {
return null;
}
} else if (doAudio && audio_st != null && pkt.stream_index() == audio_st.index()) {
if (pkt2.size() <= 0) {
// HashMap is unacceptably slow on Android
// pkt2.put(pkt);
BytePointer.memcpy(pkt2, pkt, sizeof_pkt);
}
av_frame_unref(samples_frame);
// Decode audio frame
int len = avcodec_decode_audio4(audio_c, samples_frame, got_frame, pkt2);
if (len <= 0) {
// On error, trash the whole packet
pkt2.size(0);
} else {
pkt2.data(pkt2.data().position(len));
pkt2.size(pkt2.size() - len);
if (got_frame[0] != 0) {
long pts = av_frame_get_best_effort_timestamp(samples_frame);
AVRational time_base = audio_st.time_base();
timestamp = 1000000L * pts * time_base.num() / time_base.den();
/* if a frame has been decoded, output it */
done = true;
int sample_format = samples_frame.format();
int planes = av_sample_fmt_is_planar(sample_format) != 0 ? (int)samples_frame.channels() : 1;
int data_size = av_samples_get_buffer_size((IntPointer)null, audio_c.channels(),
samples_frame.nb_samples(), audio_c.sample_fmt(), 1) / planes;
if (samples_buf == null || samples_buf.length != planes) {
samples_ptr = new BytePointer[planes];
samples_buf = new Buffer[planes];
}
frame.keyFrame = samples_frame.key_frame() != 0;
frame.sampleRate = audio_c.sample_rate();
frame.audioChannels = audio_c.channels();
frame.samples = samples_buf;
frame.opaque = samples_frame;
int sample_size = data_size / av_get_bytes_per_sample(sample_format);
for (int i = 0; i < planes; i++) {
BytePointer p = samples_frame.data(i);
if (!p.equals(samples_ptr[i]) || samples_ptr[i].capacity() < data_size) {
samples_ptr[i] = p.capacity(data_size);
ByteBuffer b = p.asBuffer();
switch (sample_format) {
case AV_SAMPLE_FMT_U8:
case AV_SAMPLE_FMT_U8P: samples_buf[i] = b; break;
case AV_SAMPLE_FMT_S16:
case AV_SAMPLE_FMT_S16P: samples_buf[i] = b.asShortBuffer(); break;
case AV_SAMPLE_FMT_S32:
case AV_SAMPLE_FMT_S32P: samples_buf[i] = b.asIntBuffer(); break;
case AV_SAMPLE_FMT_FLT:
case AV_SAMPLE_FMT_FLTP: samples_buf[i] = b.asFloatBuffer(); break;
case AV_SAMPLE_FMT_DBL:
case AV_SAMPLE_FMT_DBLP: samples_buf[i] = b.asDoubleBuffer(); break;
default: assert false;
}
}
samples_buf[i].position(0).limit(sample_size);
}
}
}
}
if (pkt2.size() <= 0) {
// Free the packet that was allocated by av_read_frame
av_packet_unref(pkt);
}
}
return frame;
}
public AVPacket grabPacket() throws Exception {
if (oc == null || oc.isNull()) {
throw new Exception("Could not trigger: No AVFormatContext. (Has start() been called?)");
}
// Return the next frame of a stream.
if (av_read_frame(oc, pkt) < 0) {
return null;
}
return pkt;
}
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