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https://github.com/libretro/scummvm.git
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108 lines
2.9 KiB
C++
108 lines
2.9 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "common/debug.h"
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#include "common/stream.h"
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#include "common/system.h"
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#include "common/textconsole.h"
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#include "graphics/surface.h"
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#include "graphics/yuv_to_rgb.h"
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#include "image/codecs/mpeg.h"
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namespace Image {
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MPEGDecoder::MPEGDecoder() : Codec() {
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_pixelFormat = g_system->getScreenFormat();
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_surface = 0;
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_mpegDecoder = mpeg2_init();
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if (!_mpegDecoder)
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error("Could not initialize libmpeg2");
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_mpegInfo = mpeg2_info(_mpegDecoder);
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}
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MPEGDecoder::~MPEGDecoder() {
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mpeg2_close(_mpegDecoder);
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if (_surface) {
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_surface->free();
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delete _surface;
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}
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}
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const Graphics::Surface *MPEGDecoder::decodeFrame(Common::SeekableReadStream &stream) {
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uint32 framePeriod;
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decodePacket(stream, framePeriod);
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return _surface;
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}
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bool MPEGDecoder::decodePacket(Common::SeekableReadStream &packet, uint32 &framePeriod, Graphics::Surface *dst) {
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// Decode as much as we can out of this packet
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uint32 size = 0xFFFFFFFF;
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mpeg2_state_t state;
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bool foundFrame = false;
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framePeriod = 0;
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do {
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state = mpeg2_parse(_mpegDecoder);
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switch (state) {
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case STATE_BUFFER:
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size = packet.read(_buffer, BUFFER_SIZE);
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mpeg2_buffer(_mpegDecoder, _buffer, _buffer + size);
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break;
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case STATE_SLICE:
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case STATE_END:
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if (_mpegInfo->display_fbuf) {
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foundFrame = true;
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const mpeg2_sequence_t *sequence = _mpegInfo->sequence;
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framePeriod += sequence->frame_period;
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if (!dst) {
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// If no destination is specified, use our internal storage
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if (!_surface) {
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_surface = new Graphics::Surface();
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_surface->create(sequence->picture_width, sequence->picture_height, _pixelFormat);
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}
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dst = _surface;
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}
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YUVToRGBMan.convert420(dst, Graphics::YUVToRGBManager::kScaleITU, _mpegInfo->display_fbuf->buf[0],
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_mpegInfo->display_fbuf->buf[1], _mpegInfo->display_fbuf->buf[2], sequence->picture_width,
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sequence->picture_height, sequence->width, sequence->chroma_width);
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}
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break;
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default:
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break;
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}
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} while (size != 0);
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return foundFrame;
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}
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} // End of namespace Image
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