libavcodec/qtrle.c File Reference

QT RLE Video Decoder by Mike Melanson (melanson@pcisys.net) For more information about the QT RLE format, visit: http://www.pcisys.net/~melanson/codecs/. More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "libavutil/intreadwrite.h"
#include "avcodec.h"

Go to the source code of this file.

Data Structures
struct	QtrleContext
Defines
#define	CHECK_STREAM_PTR(n)
#define	CHECK_PIXEL_PTR(n)
Functions
static void	qtrle_decode_1bpp (QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change)
static void	qtrle_decode_2n4bpp (QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change, int bpp)
static void	qtrle_decode_8bpp (QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change)
static void	qtrle_decode_16bpp (QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change)
static void	qtrle_decode_24bpp (QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change)
static void	qtrle_decode_32bpp (QtrleContext *s, int stream_ptr, int row_ptr, int lines_to_change)
static av_cold int	qtrle_decode_init (AVCodecContext *avctx)
static int	qtrle_decode_frame (AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
static av_cold int	qtrle_decode_end (AVCodecContext *avctx)
Variables
AVCodec	qtrle_decoder

---

Detailed Description

QT RLE Video Decoder by Mike Melanson (melanson@pcisys.net) For more information about the QT RLE format, visit: http://www.pcisys.net/~melanson/codecs/.

The QT RLE decoder has seven modes of operation: 1, 2, 4, 8, 16, 24, and 32 bits per pixel. For modes 1, 2, 4, and 8 the decoder outputs PAL8 colorspace data. 16-bit data yields RGB555 data. 24-bit data is RGB24 and 32-bit data is RGB32.

Definition in file qtrle.c.

---

Define Documentation

#define CHECK_PIXEL_PTR

(

n

)

Value:

if ((pixel_ptr + n > pixel_limit) || (pixel_ptr + n < 0)) { \
    av_log (s->avctx, AV_LOG_INFO, "Problem: pixel_ptr = %d, pixel_limit = %d\n", \
      pixel_ptr + n, pixel_limit); \
    return; \
  } \

Definition at line 59 of file qtrle.c.

#define CHECK_STREAM_PTR

(

n

)

Value:

if ((stream_ptr + n) > s->size) { \
    av_log (s->avctx, AV_LOG_INFO, "Problem: stream_ptr out of bounds (%d >= %d)\n", \
      stream_ptr + n, s->size); \
    return; \
  }

Definition at line 52 of file qtrle.c.

---

Function Documentation

static void qtrle_decode_16bpp	(	QtrleContext *	s,
		int	stream_ptr,
		int	row_ptr,
		int	lines_to_change
	)			[static]

Definition at line 229 of file qtrle.c.

Referenced by qtrle_decode_frame().

static void qtrle_decode_1bpp	(	QtrleContext *	s,
		int	stream_ptr,
		int	row_ptr,
		int	lines_to_change
	)			[static]

Definition at line 66 of file qtrle.c.

Referenced by qtrle_decode_frame().

static void qtrle_decode_24bpp	(	QtrleContext *	s,
		int	stream_ptr,
		int	row_ptr,
		int	lines_to_change
	)			[static]

Definition at line 279 of file qtrle.c.

Referenced by qtrle_decode_frame().

static void qtrle_decode_2n4bpp	(	QtrleContext *	s,
		int	stream_ptr,
		int	row_ptr,
		int	lines_to_change,
		int	bpp
	)			[inline, static]

Definition at line 116 of file qtrle.c.

Referenced by qtrle_decode_frame().

static void qtrle_decode_32bpp	(	QtrleContext *	s,
		int	stream_ptr,
		int	row_ptr,
		int	lines_to_change
	)			[static]

Definition at line 330 of file qtrle.c.

Referenced by qtrle_decode_frame().

static void qtrle_decode_8bpp	(	QtrleContext *	s,
		int	stream_ptr,
		int	row_ptr,
		int	lines_to_change
	)			[static]

Definition at line 175 of file qtrle.c.

Referenced by qtrle_decode_frame().

static av_cold int qtrle_decode_end

(

AVCodecContext *

avctx

)

[static]

Definition at line 536 of file qtrle.c.

static int qtrle_decode_frame	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 430 of file qtrle.c.

static av_cold int qtrle_decode_init

(

AVCodecContext *

avctx

)

[static]

Definition at line 387 of file qtrle.c.

---

Variable Documentation

AVCodec qtrle_decoder

Initial value:

 {
    "qtrle",
    CODEC_TYPE_VIDEO,
    CODEC_ID_QTRLE,
    sizeof(QtrleContext),
    qtrle_decode_init,
    NULL,
    qtrle_decode_end,
    qtrle_decode_frame,
    CODEC_CAP_DR1,
    .long_name = NULL_IF_CONFIG_SMALL("QuickTime Animation (RLE) video"),
}

Definition at line 546 of file qtrle.c.