public boolean record(IplImage image, int pixelFormat) throws Exception {
if (video_st == null) {
throw new Exception(
"No video output stream (Is imageWidth > 0 && imageHeight > 0 and has start() been called?)");
}
int ret;
if (image == null) {
/* no more frame to compress. The codec has a latency of a few
frames if using B frames, so we get the last frames by
passing the same picture again */
} else {
int width = image.width();
int height = image.height();
int step = image.widthStep();
BytePointer data = image.imageData();
if (pixelFormat == AV_PIX_FMT_NONE) {
int depth = image.depth();
int channels = image.nChannels();
if ((depth == IPL_DEPTH_8U || depth == IPL_DEPTH_8S) && channels == 3) {
pixelFormat = AV_PIX_FMT_BGR24;
} else if ((depth == IPL_DEPTH_8U || depth == IPL_DEPTH_8S) && channels == 1) {
pixelFormat = AV_PIX_FMT_GRAY8;
} else if ((depth == IPL_DEPTH_16U || depth == IPL_DEPTH_16S) && channels == 1) {
pixelFormat = AV_HAVE_BIGENDIAN() ? AV_PIX_FMT_GRAY16BE : AV_PIX_FMT_GRAY16LE;
} else if ((depth == IPL_DEPTH_8U || depth == IPL_DEPTH_8S) && channels == 4) {
pixelFormat = AV_PIX_FMT_RGBA;
} else if ((depth == IPL_DEPTH_8U || depth == IPL_DEPTH_8S) && channels == 2) {
pixelFormat = AV_PIX_FMT_NV21; // Android's camera capture format
step = width;
} else {
throw new Exception(
"Could not guess pixel format of image: depth=" + depth + ", channels=" + channels);
}
}
if (video_c.pix_fmt() != pixelFormat
|| video_c.width() != width
|| video_c.height() != height) {
/* convert to the codec pixel format if needed */
img_convert_ctx =
sws_getCachedContext(
img_convert_ctx,
width,
height,
pixelFormat,
video_c.width(),
video_c.height(),
video_c.pix_fmt(),
SWS_BILINEAR,
null,
null,
null);
if (img_convert_ctx == null) {
throw new Exception(
"sws_getCachedContext() error: Cannot initialize the conversion context.");
}
avpicture_fill(tmp_picture, data, pixelFormat, width, height);
avpicture_fill(picture, picture_buf, video_c.pix_fmt(), video_c.width(), video_c.height());
tmp_picture.linesize(0, step);
sws_scale(
img_convert_ctx,
new PointerPointer(tmp_picture),
tmp_picture.linesize(),
0,
height,
new PointerPointer(picture),
picture.linesize());
} else {
avpicture_fill(picture, data, pixelFormat, width, height);
picture.linesize(0, step);
}
}
if ((oformat.flags() & AVFMT_RAWPICTURE) != 0) {
if (image == null) {
return false;
}
/* raw video case. The API may change slightly in the future for that? */
av_init_packet(video_pkt);
video_pkt.flags(video_pkt.flags() | AV_PKT_FLAG_KEY);
video_pkt.stream_index(video_st.index());
video_pkt.data(new BytePointer(picture));
video_pkt.size(Loader.sizeof(AVPicture.class));
} else {
/* encode the image */
av_init_packet(video_pkt);
video_pkt.data(video_outbuf);
video_pkt.size(video_outbuf_size);
picture.quality(video_c.global_quality());
if ((ret =
avcodec_encode_video2(
video_c, video_pkt, image == null ? null : picture, got_video_packet))
< 0) {
throw new Exception(
"avcodec_encode_video2() error " + ret + ": Could not encode video packet.");
}
picture.pts(picture.pts() + 1); // magic required by libx264
/* if zero size, it means the image was buffered */
if (got_video_packet[0] != 0) {
if (video_pkt.pts() != AV_NOPTS_VALUE) {
video_pkt.pts(av_rescale_q(video_pkt.pts(), video_c.time_base(), video_st.time_base()));
}
if (video_pkt.dts() != AV_NOPTS_VALUE) {
video_pkt.dts(av_rescale_q(video_pkt.dts(), video_c.time_base(), video_st.time_base()));
}
video_pkt.stream_index(video_st.index());
} else {
return false;
}
}
synchronized (oc) {
/* write the compressed frame in the media file */
if (interleaved && audio_st != null) {
if ((ret = av_interleaved_write_frame(oc, video_pkt)) < 0) {
throw new Exception(
"av_interleaved_write_frame() error "
+ ret
+ " while writing interleaved video frame.");
}
} else {
if ((ret = av_write_frame(oc, video_pkt)) < 0) {
throw new Exception("av_write_frame() error " + ret + " while writing video frame.");
}
}
}
return picture.key_frame() != 0;
}
public IplImage grab() throws Exception {
if (pFormatCtx == null || pFormatCtx.isNull()) {
throw new Exception("Could not grab: No AVFormatContext. (Has start() been called?)");
}
boolean done = false;
long pts = 0;
while (!done) {
if (av_read_frame(pFormatCtx, packet) < 0) {
// throw new Exception("Could not read frame");
return null; // end of file?
}
// Is this a packet from the video stream?
if (packet.stream_index() == videoStream) {
// Decode video frame
int len = avcodec_decode_video2(pCodecCtx, pFrame, frameFinished, packet);
LongPointer opaque = new LongPointer(pFrame.opaque());
if (packet.dts() != AV_NOPTS_VALUE) {
pts = packet.dts();
} else if (!opaque.isNull() && opaque.get() != AV_NOPTS_VALUE) {
pts = opaque.get();
} else {
pts = 0;
}
AVRational time_base = pStream.time_base();
pts = 1000 * pts * time_base.num() / time_base.den();
// Did we get a video frame?
if (len > 0 && frameFinished[0] != 0) {
switch (colorMode) {
case BGR:
case GRAY:
// Deinterlace Picture
if (deinterlace) {
avpicture_deinterlace(
pFrame, pFrame, pCodecCtx.pix_fmt(), pCodecCtx.width(), pCodecCtx.height());
}
// Convert the image from its native format to RGB
sws_scale(
img_convert_ctx,
new PointerPointer(pFrame),
pFrame.linesize(),
0,
pCodecCtx.height(),
new PointerPointer(pFrameRGB),
pFrameRGB.linesize());
return_image.imageData(buffer);
return_image.widthStep(pFrameRGB.linesize(0));
break;
case RAW:
assert (pCodecCtx.width() == return_image.width()
&& pCodecCtx.height() == return_image.height());
return_image.imageData(pFrame.data(0));
return_image.widthStep(pFrame.linesize(0));
break;
default:
assert (false);
}
return_image.imageSize(return_image.height() * return_image.widthStep());
done = true;
}
}
// Free the packet that was allocated by av_read_frame
av_free_packet(packet);
}
return_image.timestamp = pts;
return return_image;
}