VIDEO: Add an MPEG 1/2 decoder

2 files changed, 205 insertions, 0 deletions

diff --git a/video/codecs/mpeg.cpp b/video/codecs/mpeg.cpp
new file mode 100644
index 0000000000..cb3c63fcfc
--- /dev/null
+++ b/video/codecs/mpeg.cpp
@@ -0,0 +1,107 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "common/debug.h"
+#include "common/stream.h"
+#include "common/system.h"
+#include "common/textconsole.h"
+#include "graphics/surface.h"
+#include "graphics/yuv_to_rgb.h"
+
+#include "video/codecs/mpeg.h"
+
+namespace Video {
+
+MPEGDecoder::MPEGDecoder() : Codec() {
+	_pixelFormat = g_system->getScreenFormat();
+	_surface = 0;
+
+	_mpegDecoder = mpeg2_init();
+
+	if (!_mpegDecoder)
+		error("Could not initialize libmpeg2");
+
+	_mpegInfo = mpeg2_info(_mpegDecoder);
+}
+
+MPEGDecoder::~MPEGDecoder() {
+	mpeg2_close(_mpegDecoder);
+
+	if (_surface) {
+		_surface->free();
+		delete _surface;
+	}
+}
+
+const Graphics::Surface *MPEGDecoder::decodeImage(Common::SeekableReadStream *stream) {
+	uint32 framePeriod;
+	decodePacket(stream, framePeriod);
+	return _surface;
+}
+
+bool MPEGDecoder::decodePacket(Common::SeekableReadStream *packet, uint32 &framePeriod, Graphics::Surface *dst) {			
+	// Decode as much as we can out of this packet
+	uint32 size = 0xFFFFFFFF;
+	mpeg2_state_t state;
+	bool foundFrame = false;
+	framePeriod = 0;
+
+	do {
+		state = mpeg2_parse(_mpegDecoder);
+
+		switch (state) {
+		case STATE_BUFFER:
+			size = packet->read(_buffer, BUFFER_SIZE);
+			mpeg2_buffer(_mpegDecoder, _buffer, _buffer + size);
+			break;
+		case STATE_SLICE:
+		case STATE_END:
+			if (_mpegInfo->display_fbuf) {
+				foundFrame = true;
+				const mpeg2_sequence_t *sequence = _mpegInfo->sequence;
+
+				framePeriod += sequence->frame_period;
+
+				if (!dst) {
+					// If no destination is specified, use our internal storage
+					if (!_surface) {
+						_surface = new Graphics::Surface();
+						_surface->create(sequence->picture_width, sequence->picture_height, _pixelFormat);
+					}
+
+					dst = _surface;
+				}
+
+				YUVToRGBMan.convert420(dst, Graphics::YUVToRGBManager::kScaleITU, _mpegInfo->display_fbuf->buf[0],
+						_mpegInfo->display_fbuf->buf[1], _mpegInfo->display_fbuf->buf[2], sequence->picture_width,
+						sequence->picture_height, sequence->width, sequence->chroma_width);
+			}
+			break;
+		default:
+			break;
+		}
+	} while (size != 0);
+
+	return foundFrame;
+}
+
+} // End of namespace Video
diff --git a/video/codecs/mpeg.h b/video/codecs/mpeg.h
new file mode 100644
index 0000000000..0082844537
--- /dev/null
+++ b/video/codecs/mpeg.h
@@ -0,0 +1,98 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 2
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifdef USE_MPEG2
+
+#ifndef VIDEO_CODECS_MPEG_H
+#define VIDEO_CODECS_MPEG_H
+
+#include "video/codecs/codec.h"
+#include "graphics/pixelformat.h"
+
+#if defined(__PLAYSTATION2__)
+	typedef uint8 uint8_t;
+	typedef uint16 uint16_t;
+	typedef uint32 uint32_t;
+#elif defined(_WIN32_WCE)
+	typedef signed char int8_t;
+	typedef signed short int16_t;
+	typedef unsigned char uint8_t;
+	typedef unsigned short uint16_t;
+#elif defined(_MSC_VER)
+	typedef signed char int8_t;
+	typedef signed short int16_t;
+	typedef unsigned char uint8_t;
+	typedef unsigned short uint16_t;
+	#if !defined(SDL_COMPILEDVERSION) || (SDL_COMPILEDVERSION < 1210)
+	typedef signed long int32_t;
+	typedef unsigned long uint32_t;
+	#endif
+#else
+#	include <inttypes.h>
+#endif
+
+extern "C" {
+	#include <mpeg2dec/mpeg2.h>
+}
+
+namespace Common {
+class SeekableReadStream;
+}
+
+namespace Graphics {
+struct Surface;
+}
+
+namespace Video {
+
+// MPEG 1/2 video decoder
+
+class MPEGDecoder : public Codec {
+public:
+	MPEGDecoder();
+	~MPEGDecoder();
+
+	// Codec interface
+	const Graphics::Surface *decodeImage(Common::SeekableReadStream *stream);
+	Graphics::PixelFormat getPixelFormat() const { return _pixelFormat; }
+
+	// MPEGPSDecoder call
+	bool decodePacket(Common::SeekableReadStream *packet, uint32 &framePeriod, Graphics::Surface *dst = 0);
+
+private:
+	Graphics::PixelFormat _pixelFormat;
+	Graphics::Surface *_surface;
+
+	enum {
+		BUFFER_SIZE = 4096
+	};
+
+	byte _buffer[BUFFER_SIZE];
+	mpeg2dec_t *_mpegDecoder;
+	const mpeg2_info_t *_mpegInfo;
+};
+
+} // End of namespace Video
+
+#endif // VIDEO_CODECS_MPEG_H
+
+#endif // USE_MPEG2