smc.c File Reference

QT SMC Video Decoder by Mike Melanson (melan.nosp@m.son@.nosp@m.pcisy.nosp@m.s.ne.nosp@m.t) For more information about the SMC format, visit: http://www.pcisys.net/~melanson/codecs/. More...

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

Go to the source code of this file.

Data Structures
struct	SmcContext

Macros
#define	CPAIR   2
#define	CQUAD   4
#define	COCTET   8
#define	COLORS_PER_TABLE   256
#define	GET_BLOCK_COUNT()   (opcode & 0x10) ? (1 + bytestream2_get_byte(&s->gb)) : 1 + (opcode & 0x0F);
#define	ADVANCE_BLOCK()

Functions
static void	smc_decode_stream (SmcContext *s)
static av_cold int	smc_decode_init (AVCodecContext *avctx)
static int	smc_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
static av_cold int	smc_decode_end (AVCodecContext *avctx)

Variables
AVCodec	ff_smc_decoder

Detailed Description

QT SMC Video Decoder by Mike Melanson (melan.nosp@m.son@.nosp@m.pcisy.nosp@m.s.ne.nosp@m.t) For more information about the SMC format, visit: http://www.pcisys.net/~melanson/codecs/.

The SMC decoder outputs PAL8 colorspace data.

Definition in file smc.c.

Macro Definition Documentation

CPAIR

#define CPAIR   2

Definition at line 40 of file smc.c.

Referenced by smc_decode_stream().

CQUAD

#define CQUAD   4

Definition at line 41 of file smc.c.

Referenced by smc_decode_stream().

COCTET

#define COCTET   8

Definition at line 42 of file smc.c.

Referenced by smc_decode_stream().

COLORS_PER_TABLE

#define COLORS_PER_TABLE   256

Definition at line 44 of file smc.c.

Referenced by smc_decode_stream().

GET_BLOCK_COUNT

#define GET_BLOCK_COUNT

(

)

(opcode & 0x10) ? (1 + bytestream2_get_byte(&s->gb)) : 1 + (opcode & 0x0F);

Definition at line 61 of file smc.c.

Referenced by smc_decode_stream().

ADVANCE_BLOCK

#define ADVANCE_BLOCK

(

)

Value:

{ \
    pixel_ptr += 4; \
    if (pixel_ptr >= width) \
    { \
        pixel_ptr = 0; \
        row_ptr += stride * 4; \
    } \
    total_blocks--; \
    if (total_blocks < !!n_blocks) \
    { \
        av_log(s->avctx, AV_LOG_INFO, "warning: block counter just went negative (this should not happen)\n"); \
        return; \
    } \
}

Definition at line 64 of file smc.c.

Referenced by smc_decode_stream().

Function Documentation

smc_decode_stream()

static void smc_decode_stream ( SmcContext *  s )

static

Definition at line 80 of file smc.c.

Referenced by smc_decode_frame().

smc_decode_init()

static av_cold int smc_decode_init ( AVCodecContext *  avctx )

static

Definition at line 417 of file smc.c.

smc_decode_frame()

static int smc_decode_frame ( AVCodecContext *  avctx, void *  data, int *  got_frame, AVPacket *  avpkt  )

static

Definition at line 431 of file smc.c.

smc_decode_end()

static av_cold int smc_decode_end ( AVCodecContext *  avctx )

static

Definition at line 468 of file smc.c.

Variable Documentation

ff_smc_decoder

AVCodec ff_smc_decoder

Initial value:

= {
    .name           = "smc",
    .long_name      = NULL_IF_CONFIG_SMALL("QuickTime Graphics (SMC)"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_SMC,
    .priv_data_size = sizeof(SmcContext),
    .init           = smc_decode_init,
    .close          = smc_decode_end,
    .decode         = smc_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
}

Definition at line 477 of file smc.c.