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FFmpeg/libavcodec/truemotion1.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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/*
* Duck TrueMotion 1.0 Decoder
* Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Duck TrueMotion v1 Video Decoder by
* Alex Beregszaszi and
* Mike Melanson (melanson@pcisys.net)
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "codec_internal.h"
#include "internal.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "truemotion1data.h"
typedef struct TrueMotion1Context {
AVCodecContext *avctx;
AVFrame *frame;
const uint8_t *buf;
int size;
const uint8_t *mb_change_bits;
int mb_change_bits_row_size;
const uint8_t *index_stream;
int index_stream_size;
int flags;
int x, y, w, h;
uint32_t y_predictor_table[1024];
uint32_t c_predictor_table[1024];
uint32_t fat_y_predictor_table[1024];
uint32_t fat_c_predictor_table[1024];
int compression;
int block_type;
int block_width;
int block_height;
int16_t ydt[8];
int16_t cdt[8];
int16_t fat_ydt[8];
int16_t fat_cdt[8];
int last_deltaset, last_vectable;
unsigned int *vert_pred;
int vert_pred_size;
} TrueMotion1Context;
#define FLAG_SPRITE 32
#define FLAG_KEYFRAME 16
#define FLAG_INTERFRAME 8
#define FLAG_INTERPOLATED 4
struct frame_header {
uint8_t header_size;
uint8_t compression;
uint8_t deltaset;
uint8_t vectable;
uint16_t ysize;
uint16_t xsize;
uint16_t checksum;
uint8_t version;
uint8_t header_type;
uint8_t flags;
uint8_t control;
uint16_t xoffset;
uint16_t yoffset;
uint16_t width;
uint16_t height;
};
#define ALGO_NOP 0
#define ALGO_RGB16V 1
#define ALGO_RGB16H 2
#define ALGO_RGB24H 3
/* these are the various block sizes that can occupy a 4x4 block */
#define BLOCK_2x2 0
#define BLOCK_2x4 1
#define BLOCK_4x2 2
#define BLOCK_4x4 3
typedef struct comp_types {
int algorithm;
int block_width; // vres
int block_height; // hres
int block_type;
} comp_types;
/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
static const comp_types compression_types[17] = {
{ ALGO_NOP, 0, 0, 0 },
{ ALGO_RGB16V, 4, 4, BLOCK_4x4 },
{ ALGO_RGB16H, 4, 4, BLOCK_4x4 },
{ ALGO_RGB16V, 4, 2, BLOCK_4x2 },
{ ALGO_RGB16H, 4, 2, BLOCK_4x2 },
{ ALGO_RGB16V, 2, 4, BLOCK_2x4 },
{ ALGO_RGB16H, 2, 4, BLOCK_2x4 },
{ ALGO_RGB16V, 2, 2, BLOCK_2x2 },
{ ALGO_RGB16H, 2, 2, BLOCK_2x2 },
{ ALGO_NOP, 4, 4, BLOCK_4x4 },
{ ALGO_RGB24H, 4, 4, BLOCK_4x4 },
{ ALGO_NOP, 4, 2, BLOCK_4x2 },
{ ALGO_RGB24H, 4, 2, BLOCK_4x2 },
{ ALGO_NOP, 2, 4, BLOCK_2x4 },
{ ALGO_RGB24H, 2, 4, BLOCK_2x4 },
{ ALGO_NOP, 2, 2, BLOCK_2x2 },
{ ALGO_RGB24H, 2, 2, BLOCK_2x2 }
};
static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
{
int i;
if (delta_table_index > 3)
return;
memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
/* Y skinny deltas need to be halved for some reason; maybe the
* skinny Y deltas should be modified */
for (i = 0; i < 8; i++)
{
/* drop the lsb before dividing by 2-- net effect: round down
* when dividing a negative number (e.g., -3/2 = -2, not -1) */
s->ydt[i] &= 0xFFFE;
s->ydt[i] /= 2;
}
}
#if HAVE_BIGENDIAN
static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
#else
static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
#endif
{
int lo, hi;
lo = ydt[p1];
lo += (lo * 32) + (lo * 1024);
hi = ydt[p2];
hi += (hi * 32) + (hi * 1024);
return (lo + (hi * (1U << 16))) * 2;
}
static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
{
int r, b, lo;
b = cdt[p2];
r = cdt[p1] * 1024;
lo = b + r;
return (lo + (lo * (1U << 16))) * 2;
}
#if HAVE_BIGENDIAN
static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
#else
static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
#endif
{
int lo, hi;
lo = ydt[p1];
lo += (lo << 6) + (lo << 11);
hi = ydt[p2];
hi += (hi << 6) + (hi << 11);
return (lo + (hi << 16)) << 1;
}
static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
{
int r, b, lo;
b = cdt[p2];
r = cdt[p1] << 11;
lo = b + r;
return (lo + (lo * (1 << 16))) * 2;
}
static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
{
int lo, hi;
lo = ydt[p1];
hi = ydt[p2];
return (lo + (hi * (1 << 8)) + (hi * (1 << 16))) * 2;
}
static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
{
int r, b;
b = cdt[p2];
r = cdt[p1] * (1 << 16);
return (b+r) * 2;
}
static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
{
int len, i, j;
unsigned char delta_pair;
for (i = 0; i < 1024; i += 4)
{
len = *sel_vector_table++ / 2;
for (j = 0; j < len; j++)
{
delta_pair = *sel_vector_table++;
s->y_predictor_table[i+j] = 0xfffffffe &
make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
s->c_predictor_table[i+j] = 0xfffffffe &
make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
}
s->y_predictor_table[i+(j-1)] |= 1;
s->c_predictor_table[i+(j-1)] |= 1;
}
}
static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
{
int len, i, j;
unsigned char delta_pair;
for (i = 0; i < 1024; i += 4)
{
len = *sel_vector_table++ / 2;
for (j = 0; j < len; j++)
{
delta_pair = *sel_vector_table++;
s->y_predictor_table[i+j] = 0xfffffffe &
make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
s->c_predictor_table[i+j] = 0xfffffffe &
make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
}
s->y_predictor_table[i+(j-1)] |= 1;
s->c_predictor_table[i+(j-1)] |= 1;
}
}
static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
{
int len, i, j;
unsigned char delta_pair;
for (i = 0; i < 1024; i += 4)
{
len = *sel_vector_table++ / 2;
for (j = 0; j < len; j++)
{
delta_pair = *sel_vector_table++;
s->y_predictor_table[i+j] = 0xfffffffe &
make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
s->c_predictor_table[i+j] = 0xfffffffe &
make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
s->fat_y_predictor_table[i+j] = 0xfffffffe &
make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
s->fat_c_predictor_table[i+j] = 0xfffffffe &
make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
}
s->y_predictor_table[i+(j-1)] |= 1;
s->c_predictor_table[i+(j-1)] |= 1;
s->fat_y_predictor_table[i+(j-1)] |= 1;
s->fat_c_predictor_table[i+(j-1)] |= 1;
}
}
/* Returns the number of bytes consumed from the bytestream. Returns -1 if
* there was an error while decoding the header */
static int truemotion1_decode_header(TrueMotion1Context *s)
{
int i, ret;
int width_shift = 0;
int new_pix_fmt;
struct frame_header header;
uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */
const uint8_t *sel_vector_table;
header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
if (s->buf[0] < 0x10)
{
av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
return AVERROR_INVALIDDATA;
}
if (header.header_size + 1 > s->size) {
av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n");
return AVERROR_INVALIDDATA;
}
/* unscramble the header bytes with a XOR operation */
for (i = 1; i < header.header_size; i++)
header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
header.compression = header_buffer[0];
header.deltaset = header_buffer[1];
header.vectable = header_buffer[2];
header.ysize = AV_RL16(&header_buffer[3]);
header.xsize = AV_RL16(&header_buffer[5]);
header.checksum = AV_RL16(&header_buffer[7]);
header.version = header_buffer[9];
header.header_type = header_buffer[10];
header.flags = header_buffer[11];
header.control = header_buffer[12];
/* Version 2 */
if (header.version >= 2)
{
if (header.header_type > 3)
{
av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
return AVERROR_INVALIDDATA;
} else if ((header.header_type == 2) || (header.header_type == 3)) {
s->flags = header.flags;
if (!(s->flags & FLAG_INTERFRAME))
s->flags |= FLAG_KEYFRAME;
} else
s->flags = FLAG_KEYFRAME;
} else /* Version 1 */
s->flags = FLAG_KEYFRAME;
if (s->flags & FLAG_SPRITE) {
avpriv_request_sample(s->avctx, "Frame with sprite");
/* FIXME header.width, height, xoffset and yoffset aren't initialized */
return AVERROR_PATCHWELCOME;
} else {
s->w = header.xsize;
s->h = header.ysize;
if (header.header_type < 2) {
if ((s->w < 213) && (s->h >= 176))
{
s->flags |= FLAG_INTERPOLATED;
avpriv_request_sample(s->avctx, "Interpolated frame");
}
}
}
if (header.compression >= 17) {
av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
return AVERROR_INVALIDDATA;
}
if ((header.deltaset != s->last_deltaset) ||
(header.vectable != s->last_vectable))
select_delta_tables(s, header.deltaset);
if ((header.compression & 1) && header.header_type)
sel_vector_table = pc_tbl2;
else {
if (header.vectable > 0 && header.vectable < 4)
sel_vector_table = tables[header.vectable - 1];
else {
av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
return AVERROR_INVALIDDATA;
}
}
if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
new_pix_fmt = AV_PIX_FMT_0RGB32;
width_shift = 1;
} else
new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
s->w >>= width_shift;
if (s->w & 1) {
avpriv_request_sample(s->avctx, "Frame with odd width");
return AVERROR_PATCHWELCOME;
}
if (s->w != s->avctx->width || s->h != s->avctx->height ||
new_pix_fmt != s->avctx->pix_fmt) {
av_frame_unref(s->frame);
s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
s->avctx->pix_fmt = new_pix_fmt;
if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0)
return ret;
ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
if (!s->vert_pred)
return AVERROR(ENOMEM);
}
/* There is 1 change bit per 4 pixels, so each change byte represents
* 32 pixels; divide width by 4 to obtain the number of change bits and
* then round up to the nearest byte. */
s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
{
if (compression_types[header.compression].algorithm == ALGO_RGB24H)
gen_vector_table24(s, sel_vector_table);
else
if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
gen_vector_table15(s, sel_vector_table);
else
gen_vector_table16(s, sel_vector_table);
}
/* set up pointers to the other key data chunks */
s->mb_change_bits = s->buf + header.header_size;
if (s->flags & FLAG_KEYFRAME) {
/* no change bits specified for a keyframe; only index bytes */
s->index_stream = s->mb_change_bits;
if (s->avctx->width * s->avctx->height / 2048 + header.header_size > s->size)
return AVERROR_INVALIDDATA;
} else {
/* one change bit per 4x4 block */
s->index_stream = s->mb_change_bits +
(s->mb_change_bits_row_size * (s->avctx->height >> 2));
}
s->index_stream_size = s->size - (s->index_stream - s->buf);
s->last_deltaset = header.deltaset;
s->last_vectable = header.vectable;
s->compression = header.compression;
s->block_width = compression_types[header.compression].block_width;
s->block_height = compression_types[header.compression].block_height;
s->block_type = compression_types[header.compression].block_type;
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
s->last_deltaset, s->last_vectable, s->compression, s->block_width,
s->block_height, s->block_type,
s->flags & FLAG_KEYFRAME ? " KEY" : "",
s->flags & FLAG_INTERFRAME ? " INTER" : "",
s->flags & FLAG_SPRITE ? " SPRITE" : "",
s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
return header.header_size;
}
static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
{
TrueMotion1Context *s = avctx->priv_data;
s->avctx = avctx;
// FIXME: it may change ?
// if (avctx->bits_per_sample == 24)
// avctx->pix_fmt = AV_PIX_FMT_RGB24;
// else
// avctx->pix_fmt = AV_PIX_FMT_RGB555;
s->frame = av_frame_alloc();
if (!s->frame)
return AVERROR(ENOMEM);
/* there is a vertical predictor for each pixel in a line; each vertical
* predictor is 0 to start with */
av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
if (!s->vert_pred)
return AVERROR(ENOMEM);
return 0;
}
/*
Block decoding order:
dxi: Y-Y
dxic: Y-C-Y
dxic2: Y-C-Y-C
hres,vres,i,i%vres (0 < i < 4)
2x2 0: 0 dxic2
2x2 1: 1 dxi
2x2 2: 0 dxic2
2x2 3: 1 dxi
2x4 0: 0 dxic2
2x4 1: 1 dxi
2x4 2: 2 dxi
2x4 3: 3 dxi
4x2 0: 0 dxic
4x2 1: 1 dxi
4x2 2: 0 dxic
4x2 3: 1 dxi
4x4 0: 0 dxic
4x4 1: 1 dxi
4x4 2: 2 dxi
4x4 3: 3 dxi
*/
#define GET_NEXT_INDEX() \
{\
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; \
}
#define INC_INDEX \
do { \
if (index >= 1023) { \
av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n"); \
return; \
} \
index++; \
} while (0)
#define APPLY_C_PREDICTOR() \
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;
#define APPLY_C_PREDICTOR_24() \
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;
#define APPLY_Y_PREDICTOR() \
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;
#define APPLY_Y_PREDICTOR_24() \
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;
#define OUTPUT_PIXEL_PAIR() \
*current_pixel_pair = *vert_pred + horiz_pred; \
*vert_pred++ = *current_pixel_pair++;
static void truemotion1_decode_16bit(TrueMotion1Context *s)
{
int y;
int pixels_left; /* remaining pixels on this line */
unsigned int predictor_pair;
unsigned int horiz_pred;
unsigned int *vert_pred;
unsigned int *current_pixel_pair;
unsigned char *current_line = s->frame->data[0];
int keyframe = s->flags & FLAG_KEYFRAME;
/* these variables are for managing the stream of macroblock change bits */
const unsigned char *mb_change_bits = s->mb_change_bits;
unsigned char mb_change_byte;
unsigned char mb_change_byte_mask;
int mb_change_index;
/* these variables are for managing the main index stream */
int index_stream_index = 0; /* yes, the index into the index stream */
int index;
/* clean out the line buffer */
memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
GET_NEXT_INDEX();
for (y = 0; y < s->avctx->height; y++) {
/* re-init variables for the next line iteration */
horiz_pred = 0;
current_pixel_pair = (unsigned int *)current_line;
vert_pred = s->vert_pred;
mb_change_index = 0;
if (!keyframe)
mb_change_byte = mb_change_bits[mb_change_index++];
mb_change_byte_mask = 0x01;
pixels_left = s->avctx->width;
while (pixels_left > 0) {
if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
switch (y & 3) {
case 0:
/* if macroblock width is 2, apply C-Y-C-Y; else
* apply C-Y-Y */
if (s->block_width == 2) {
APPLY_C_PREDICTOR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
APPLY_C_PREDICTOR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
} else {
APPLY_C_PREDICTOR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
}
break;
case 1:
case 3:
/* always apply 2 Y predictors on these iterations */
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
break;
case 2:
/* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
* depending on the macroblock type */
if (s->block_type == BLOCK_2x2) {
APPLY_C_PREDICTOR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
APPLY_C_PREDICTOR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
} else if (s->block_type == BLOCK_4x2) {
APPLY_C_PREDICTOR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
} else {
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
APPLY_Y_PREDICTOR();
OUTPUT_PIXEL_PAIR();
}
break;
}
} else {
/* skip (copy) four pixels, but reassign the horizontal
* predictor */
*vert_pred++ = *current_pixel_pair++;
horiz_pred = *current_pixel_pair - *vert_pred;
*vert_pred++ = *current_pixel_pair++;
}
if (!keyframe) {
mb_change_byte_mask <<= 1;
/* next byte */
if (!mb_change_byte_mask) {
mb_change_byte = mb_change_bits[mb_change_index++];
mb_change_byte_mask = 0x01;
}
}
pixels_left -= 4;
}
/* next change row */
if (((y + 1) & 3) == 0)
mb_change_bits += s->mb_change_bits_row_size;
current_line += s->frame->linesize[0];
}
}
static void truemotion1_decode_24bit(TrueMotion1Context *s)
{
int y;
int pixels_left; /* remaining pixels on this line */
unsigned int predictor_pair;
unsigned int horiz_pred;
unsigned int *vert_pred;
unsigned int *current_pixel_pair;
unsigned char *current_line = s->frame->data[0];
int keyframe = s->flags & FLAG_KEYFRAME;
/* these variables are for managing the stream of macroblock change bits */
const unsigned char *mb_change_bits = s->mb_change_bits;
unsigned char mb_change_byte;
unsigned char mb_change_byte_mask;
int mb_change_index;
/* these variables are for managing the main index stream */
int index_stream_index = 0; /* yes, the index into the index stream */
int index;
/* clean out the line buffer */
memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
GET_NEXT_INDEX();
for (y = 0; y < s->avctx->height; y++) {
/* re-init variables for the next line iteration */
horiz_pred = 0;
current_pixel_pair = (unsigned int *)current_line;
vert_pred = s->vert_pred;
mb_change_index = 0;
mb_change_byte = mb_change_bits[mb_change_index++];
mb_change_byte_mask = 0x01;
pixels_left = s->avctx->width;
while (pixels_left > 0) {
if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
switch (y & 3) {
case 0:
/* if macroblock width is 2, apply C-Y-C-Y; else
* apply C-Y-Y */
if (s->block_width == 2) {
APPLY_C_PREDICTOR_24();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
APPLY_C_PREDICTOR_24();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
} else {
APPLY_C_PREDICTOR_24();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
}
break;
case 1:
case 3:
/* always apply 2 Y predictors on these iterations */
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
break;
case 2:
/* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
* depending on the macroblock type */
if (s->block_type == BLOCK_2x2) {
APPLY_C_PREDICTOR_24();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
APPLY_C_PREDICTOR_24();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
} else if (s->block_type == BLOCK_4x2) {
APPLY_C_PREDICTOR_24();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
} else {
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
APPLY_Y_PREDICTOR_24();
OUTPUT_PIXEL_PAIR();
}
break;
}
} else {
/* skip (copy) four pixels, but reassign the horizontal
* predictor */
*vert_pred++ = *current_pixel_pair++;
horiz_pred = *current_pixel_pair - *vert_pred;
*vert_pred++ = *current_pixel_pair++;
}
if (!keyframe) {
mb_change_byte_mask <<= 1;
/* next byte */
if (!mb_change_byte_mask) {
mb_change_byte = mb_change_bits[mb_change_index++];
mb_change_byte_mask = 0x01;
}
}
pixels_left -= 2;
}
/* next change row */
if (((y + 1) & 3) == 0)
mb_change_bits += s->mb_change_bits_row_size;
current_line += s->frame->linesize[0];
}
}
static int truemotion1_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int ret, buf_size = avpkt->size;
TrueMotion1Context *s = avctx->priv_data;
s->buf = buf;
s->size = buf_size;
if ((ret = truemotion1_decode_header(s)) < 0)
return ret;
if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
return ret;
if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
truemotion1_decode_24bit(s);
} else if (compression_types[s->compression].algorithm != ALGO_NOP) {
truemotion1_decode_16bit(s);
}
if ((ret = av_frame_ref(rframe, s->frame)) < 0)
return ret;
*got_frame = 1;
/* report that the buffer was completely consumed */
return buf_size;
}
static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
{
TrueMotion1Context *s = avctx->priv_data;
av_frame_free(&s->frame);
av_freep(&s->vert_pred);
return 0;
}
const FFCodec ff_truemotion1_decoder = {
.p.name = "truemotion1",
.p.long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_TRUEMOTION1,
.priv_data_size = sizeof(TrueMotion1Context),
.init = truemotion1_decode_init,
.close = truemotion1_decode_end,
FF_CODEC_DECODE_CB(truemotion1_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
};
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