void VPXDecoder::decodeFrame(Graphics::Surface &surface, Common::SeekableReadStream &dataStream) {
if (!_initialized)
return;
// Read all the data from the stream
Common::ScopedArray<byte> data(new byte[dataStream.size()]);
dataStream.read(data.get(), dataStream.size());
// Perform the actual decode
vpx_codec_err_t result = vpx_codec_decode(&_context, data.get(), dataStream.size(), 0, 0);
if (result != VPX_CODEC_OK)
return;
// Try to get the image
vpx_codec_iter_t iter = 0;
vpx_image_t *image = vpx_codec_get_frame(&_context, &iter);
if (!image)
return;
// Figure out the color range
Graphics::YUVToRGBManager::LuminanceScale scale;
switch (image->range) {
case VPX_CR_STUDIO_RANGE:
scale = Graphics::YUVToRGBManager::kScaleITU;
break;
case VPX_CR_FULL_RANGE:
scale = Graphics::YUVToRGBManager::kScaleFull;
break;
default:
return;
}
// If we don't have it already, create our local surface
if (!_surface)
_surface.reset(new Graphics::Surface(image->w, image->h));
// Do the conversion based on the color space
switch (image->fmt) {
case VPX_IMG_FMT_I420:
YUVToRGBMan.convert420(scale, _surface->getData(), _surface->getPitch(), image->planes[0], image->planes[1], image->planes[2], image->w, image->h, image->stride[0], image->stride[1]);
break;
default:
return;
}
// Copy the subarea into the surface
for (int y = 0; y < surface.getHeight(); y++)
memcpy(surface.getData() + y * surface.getPitch(), _surface->getData() + (y * image->d_h) * image->d_w * 4, image->d_w * 4);
}
void H263Codec::decodeFrame(Graphics::Surface &surface, Common::SeekableReadStream &dataStream) {
// NOTE: When asking libxvidcore to decode the video into BGRA, it fills the alpha
// values with 0x00, rendering the output invisible (!).
// Since we, surprise, actually want to see the video, we would have to pass
// over the whole video data and fix-up the alpha values ourselves. Or
// alternatively do the YUV->BGRA conversion ourselves. We chose the latter.
int dataSize = dataStream.size();
byte *data = new byte[dataSize];
dataStream.read(data, dataSize);
xvid_dec_frame_t xvid_dec_frame;
memset(&xvid_dec_frame, 0, sizeof(xvid_dec_frame_t));
xvid_dec_frame.version = XVID_VERSION;
xvid_dec_frame.general = XVID_DEBLOCKY | XVID_DEBLOCKUV | XVID_DERINGY | XVID_DERINGUV;
xvid_dec_frame.bitstream = data;
xvid_dec_frame.length = dataSize;
xvid_dec_frame.output.csp = XVID_CSP_INTERNAL;
xvid_dec_stats_t xvid_dec_stats;
memset(&xvid_dec_stats, 0, sizeof(xvid_dec_stats_t));
xvid_dec_stats.version = XVID_VERSION;
int c = xvid_decore(_decHandle, XVID_DEC_DECODE, &xvid_dec_frame, &xvid_dec_stats);
if ((dataSize - c) > 1)
warning("H263Codec::decodeFrame(): %d bytes left in frame", dataSize - c);
delete[] data;
if (xvid_dec_frame.output.plane[0] &&
xvid_dec_frame.output.plane[1] &&
xvid_dec_frame.output.plane[2])
YUVToRGBMan.convert420(Graphics::YUVToRGBManager::kScaleFull,
surface.getData(), surface.getWidth() * 4,
(const byte *) xvid_dec_frame.output.plane[0],
(const byte *) xvid_dec_frame.output.plane[1],
(const byte *) xvid_dec_frame.output.plane[2], _width, _height,
xvid_dec_frame.output.stride[0], xvid_dec_frame.output.stride[1]);
}
