generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
13b4c18eb8
ffmpeg/libavcodec/truemotion1.c
Mike Melanson 364ec9dcb6 fix initialization bug in which execution overwrites essential data 
tables which causes trouble on subsequent runs if decoder is not
disposed first

Originally committed as revision 3214 to svn://svn.ffmpeg.org/ffmpeg/trunk
2004-06-11 02:24:08 +00:00

601 lines
18 KiB
C
Raw Blame History

/*
* Duck TrueMotion 1.0 Decoder
* Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @file truemotion1.c
* Duck TrueMotion v1 Video Decoder by
* Alex Beregszaszi (alex@fsn.hu) and
* Mike Melanson (melanson@pcisys.net)
*
* The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and
* outputs RGB555 data. 24-bit TM1 data is not supported yet.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "avcodec.h"
#include "dsputil.h"
#include "truemotion1data.h"
typedef struct TrueMotion1Context {
AVCodecContext *avctx;
AVFrame frame;
AVFrame prev_frame;
unsigned char *buf;
int size;
unsigned char *mb_change_bits;
int mb_change_bits_row_size;
unsigned char *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];
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;
} 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;
int block_height;
int block_type;
} comp_types;
/* { valid for metatype }, algorithm, num of deltas, horiz res, vert res */
static 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;
}
}
#ifdef WORDS_BIGENDIAN
static int make_ydt_entry(int p2, int p1, int16_t *ydt)
#else
static int make_ydt_entry(int p1, int p2, int16_t *ydt)
#endif
{
int lo, hi;
lo = ydt[p1];
lo += (lo << 5) + (lo << 10);
hi = ydt[p2];
hi += (hi << 5) + (hi << 10);
return ((lo + (hi << 16)) << 1);
}
#ifdef WORDS_BIGENDIAN
static int make_cdt_entry(int p2, int p1, int16_t *cdt)
#else
static int make_cdt_entry(int p1, int p2, int16_t *cdt)
#endif
{
int r, b, lo;
b = cdt[p2];
r = cdt[p1] << 10;
lo = b + r;
return ((lo + (lo << 16)) << 1);
}
static void gen_vector_table(TrueMotion1Context *s, 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_ydt_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
s->c_predictor_table[i+j] = 0xfffffffe &
make_cdt_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;
}
}
/* 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;
struct frame_header header;
uint8_t header_buffer[128]; /* logical maximum size of the header */
uint8_t *sel_vector_table;
/* 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) + 7) >> 3;
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\n");
return -1;
}
/* unscramble the header bytes with a XOR operation */
memset(header_buffer, 0, 128);
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 = LE_16(&header_buffer[3]);
header.xsize = LE_16(&header_buffer[5]);
header.checksum = LE_16(&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, "truemotion1: invalid header type\n");
return -1;
} 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) {
s->w = header.width;
s->h = header.height;
s->x = header.xoffset;
s->y = header.yoffset;
} 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;
}
}
if (header.compression > 17) {
av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
return -1;
}
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 < 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 -1;
}
}
if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
{
if (compression_types[header.compression].algorithm == ALGO_RGB24H)
{
av_log(s->avctx, AV_LOG_ERROR, "24bit compression not yet supported\n");
}
else
gen_vector_table(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;
} 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;
return header.header_size;
}
static int truemotion1_decode_init(AVCodecContext *avctx)
{
TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
s->avctx = avctx;
avctx->pix_fmt = PIX_FMT_RGB555;
avctx->has_b_frames = 0;
s->frame.data[0] = s->prev_frame.data[0] = NULL;
/* there is a vertical predictor for each pixel in a line; each vertical
* predictor is 0 to start with */
s->vert_pred =
(unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned short));
return 0;
}
#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 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 \
index++; \
} \
} else \
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 \
index++; \
} \
} else \
index++;
#define OUTPUT_PIXEL_PAIR() \
*current_pixel_pair = *vert_pred + horiz_pred; \
*vert_pred++ = *current_pixel_pair++; \
prev_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 int *prev_pixel_pair;
unsigned char *current_line = s->frame.data[0];
unsigned char *prev_line = s->prev_frame.data[0];
int keyframe = s->flags & FLAG_KEYFRAME;
/* these variables are for managing the stream of macroblock change bits */
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 short));
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;
prev_pixel_pair = (unsigned int *)prev_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();
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 */
*current_pixel_pair = *prev_pixel_pair++;
*vert_pred++ = *current_pixel_pair++;
*current_pixel_pair = *prev_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];
prev_line += s->prev_frame.linesize[0];
}
}
static int truemotion1_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
s->buf = buf;
s->size = buf_size;
s->frame.reference = 1;
if (avctx->get_buffer(avctx, &s->frame) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "truemotion1: get_buffer() failed\n");
return -1;
}
/* no supplementary picture */
if (buf_size == 0)
return 0;
if (truemotion1_decode_header(s) == -1)
return -1;
/* check for a do-nothing frame and copy the previous frame */
if (compression_types[s->compression].algorithm == ALGO_NOP)
{
memcpy(s->frame.data[0], s->prev_frame.data[0],
s->frame.linesize[0] * s->avctx->height);
} else if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
av_log(s->avctx, AV_LOG_ERROR, "24bit compression not yet supported\n");
} else {
truemotion1_decode_16bit(s);
}
if (s->prev_frame.data[0])
avctx->release_buffer(avctx, &s->prev_frame);
/* shuffle frames */
s->prev_frame = s->frame;
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->frame;
/* report that the buffer was completely consumed */
return buf_size;
}
static int truemotion1_decode_end(AVCodecContext *avctx)
{
TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
/* release the last frame */
if (s->prev_frame.data[0])
avctx->release_buffer(avctx, &s->prev_frame);
av_free(s->vert_pred);
return 0;
}
AVCodec truemotion1_decoder = {
"truemotion1",
CODEC_TYPE_VIDEO,
CODEC_ID_TRUEMOTION1,
sizeof(TrueMotion1Context),
truemotion1_decode_init,
NULL,
truemotion1_decode_end,
truemotion1_decode_frame,
CODEC_CAP_DR1,
};
Reference in New Issue View Git Blame Copy Permalink