truemotion1.c File Reference

Duck TrueMotion v1 Video Decoder by Alex Beregszaszi and Mike Melanson (melan.nosp@m.son@.nosp@m.pcisy.nosp@m.s.ne.nosp@m.t) More...

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "internal.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "truemotion1data.h"

Classes
struct	TrueMotion1Context
struct	frame_header
struct	comp_types

Macros
#define	FLAG_SPRITE   32
#define	FLAG_KEYFRAME   16
#define	FLAG_INTERFRAME   8
#define	FLAG_INTERPOLATED   4
#define	ALGO_NOP   0
#define	ALGO_RGB16V   1
#define	ALGO_RGB16H   2
#define	ALGO_RGB24H   3
#define	BLOCK_2x2   0
#define	BLOCK_2x4   1
#define	BLOCK_4x2   2
#define	BLOCK_4x4   3
#define	GET_NEXT_INDEX()
#define	INC_INDEX
#define	APPLY_C_PREDICTOR()
#define	APPLY_C_PREDICTOR_24()
#define	APPLY_Y_PREDICTOR()
#define	APPLY_Y_PREDICTOR_24()
#define	OUTPUT_PIXEL_PAIR()

Typedefs
typedef struct TrueMotion1Context	TrueMotion1Context
typedef struct comp_types	comp_types

Variables
AVCodec	ff_truemotion1_decoder

Detailed Description

Duck TrueMotion v1 Video Decoder by Alex Beregszaszi and Mike Melanson (melan.nosp@m.son@.nosp@m.pcisy.nosp@m.s.ne.nosp@m.t)

The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet.

Macro Definition Documentation

APPLY_C_PREDICTOR

#define APPLY_C_PREDICTOR

(

)

Value:

predictor_pair = s->c_predictor_table[index]; \
    horiz_pred += (predictor_pair >> 1); \
    if (predictor_pair & 1) { \
        GET_NEXT_INDEX() \
        if (!index) { \
            GET_NEXT_INDEX() \
            predictor_pair = s->c_predictor_table[index]; \
            horiz_pred += ((predictor_pair >> 1) * 5); \
            if (predictor_pair & 1) \
                GET_NEXT_INDEX() \
            else \
                INC_INDEX; \
        } \
    } else \
        INC_INDEX;

APPLY_C_PREDICTOR_24

#define APPLY_C_PREDICTOR_24

(

)

Value:

predictor_pair = s->c_predictor_table[index]; \
    horiz_pred += (predictor_pair >> 1); \
    if (predictor_pair & 1) { \
        GET_NEXT_INDEX() \
        if (!index) { \
            GET_NEXT_INDEX() \
            predictor_pair = s->fat_c_predictor_table[index]; \
            horiz_pred += (predictor_pair >> 1); \
            if (predictor_pair & 1) \
                GET_NEXT_INDEX() \
            else \
                INC_INDEX; \
        } \
    } else \
        INC_INDEX;

APPLY_Y_PREDICTOR

#define APPLY_Y_PREDICTOR

(

)

Value:

predictor_pair = s->y_predictor_table[index]; \
    horiz_pred += (predictor_pair >> 1); \
    if (predictor_pair & 1) { \
        GET_NEXT_INDEX() \
        if (!index) { \
            GET_NEXT_INDEX() \
            predictor_pair = s->y_predictor_table[index]; \
            horiz_pred += ((predictor_pair >> 1) * 5); \
            if (predictor_pair & 1) \
                GET_NEXT_INDEX() \
            else \
                INC_INDEX; \
        } \
    } else \
        INC_INDEX;

APPLY_Y_PREDICTOR_24

#define APPLY_Y_PREDICTOR_24

(

)

Value:

predictor_pair = s->y_predictor_table[index]; \
    horiz_pred += (predictor_pair >> 1); \
    if (predictor_pair & 1) { \
        GET_NEXT_INDEX() \
        if (!index) { \
            GET_NEXT_INDEX() \
            predictor_pair = s->fat_y_predictor_table[index]; \
            horiz_pred += (predictor_pair >> 1); \
            if (predictor_pair & 1) \
                GET_NEXT_INDEX() \
            else \
                INC_INDEX; \
        } \
    } else \
        INC_INDEX;

GET_NEXT_INDEX

#define GET_NEXT_INDEX

(

)

Value:

{\
    if (index_stream_index >= s->index_stream_size) { \
        av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
        return; \
    } \
    index = s->index_stream[index_stream_index++] * 4; \
}

INC_INDEX

#define INC_INDEX

Value:

do {                                                                \
    if (index >= 1023) {                                            \
        av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n");   \
        return;                                                     \
    }                                                               \
    index++;                                                        \
} while (0)

OUTPUT_PIXEL_PAIR

#define OUTPUT_PIXEL_PAIR

(

)

Value:

*current_pixel_pair = *vert_pred + horiz_pred; \
    *vert_pred++ = *current_pixel_pair++;

Variable Documentation

ff_truemotion1_decoder

AVCodec ff_truemotion1_decoder

Initial value:

= {
    .name           = "truemotion1",
    .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_TRUEMOTION1,
    .priv_data_size = sizeof(TrueMotion1Context),
    .init           = truemotion1_decode_init,
    .close          = truemotion1_decode_end,
    .decode         = truemotion1_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
}