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ffmpeg/libavcodec/eamad.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Electronic Arts Madcow Video Decoder
* Copyright (c) 2007-2009 Peter Ross
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* Electronic Arts Madcow Video Decoder
* @author Peter Ross <pross@xvid.org>
*
* @see technical details at
* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_MAD
*/
#include "libavutil/mem.h"
#include "libavutil/mem_internal.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "bytestream.h"
#include "bswapdsp.h"
#include "codec_internal.h"
#include "decode.h"
#include "get_bits.h"
#include "aandcttab.h"
#include "eaidct.h"
#include "mpeg12data.h"
#include "mpeg12vlc.h"
#define EA_PREAMBLE_SIZE 8
#define MADk_TAG MKTAG('M', 'A', 'D', 'k') /* MAD I-frame */
#define MADm_TAG MKTAG('M', 'A', 'D', 'm') /* MAD P-frame */
#define MADe_TAG MKTAG('M', 'A', 'D', 'e') /* MAD lqp-frame */
typedef struct MadContext {
AVCodecContext *avctx;
BlockDSPContext bdsp;
BswapDSPContext bbdsp;
AVFrame *last_frame;
GetBitContext gb;
void *bitstream_buf;
unsigned int bitstream_buf_size;
DECLARE_ALIGNED(32, int16_t, block)[64];
uint16_t quant_matrix[64];
int mb_x;
int mb_y;
} MadContext;
static av_cold int decode_init(AVCodecContext *avctx)
{
MadContext *s = avctx->priv_data;
s->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
ff_blockdsp_init(&s->bdsp);
ff_bswapdsp_init(&s->bbdsp);
ff_mpeg12_init_vlcs();
s->last_frame = av_frame_alloc();
if (!s->last_frame)
return AVERROR(ENOMEM);
return 0;
}
static inline void comp(unsigned char *dst, ptrdiff_t dst_stride,
unsigned char *src, ptrdiff_t src_stride, int add)
{
int j, i;
for (j=0; j<8; j++)
for (i=0; i<8; i++)
dst[j*dst_stride + i] = av_clip_uint8(src[j*src_stride + i] + add);
}
static inline void comp_block(MadContext *t, AVFrame *frame,
int mb_x, int mb_y,
int j, int mv_x, int mv_y, int add)
{
if (j < 4) {
unsigned offset = (mb_y*16 + ((j&2)<<2) + mv_y)*t->last_frame->linesize[0] + mb_x*16 + ((j&1)<<3) + mv_x;
if (offset >= (t->avctx->height - 7) * t->last_frame->linesize[0] - 7)
return;
comp(frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
frame->linesize[0],
t->last_frame->data[0] + offset,
t->last_frame->linesize[0], add);
} else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
int index = j - 3;
unsigned offset = (mb_y * 8 + (mv_y/2))*t->last_frame->linesize[index] + mb_x * 8 + (mv_x/2);
if (offset >= (t->avctx->height/2 - 7) * t->last_frame->linesize[index] - 7)
return;
comp(frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x * 8,
frame->linesize[index],
t->last_frame->data[index] + offset,
t->last_frame->linesize[index], add);
}
}
static inline void idct_put(MadContext *t, AVFrame *frame, int16_t *block,
int mb_x, int mb_y, int j)
{
if (j < 4) {
ff_ea_idct_put_c(
frame->data[0] + (mb_y*16 + ((j&2)<<2))*frame->linesize[0] + mb_x*16 + ((j&1)<<3),
frame->linesize[0], block);
} else if (!(t->avctx->flags & AV_CODEC_FLAG_GRAY)) {
int index = j - 3;
ff_ea_idct_put_c(
frame->data[index] + (mb_y*8)*frame->linesize[index] + mb_x*8,
frame->linesize[index], block);
}
}
static inline int decode_block_intra(MadContext *s, int16_t * block)
{
int level, i, j, run;
const uint8_t *scantable = ff_zigzag_direct;
int16_t *quant_matrix = s->quant_matrix;
block[0] = (128 + get_sbits(&s->gb, 8)) * quant_matrix[0];
/* The RL decoder is derived from mpeg1_decode_block_intra;
Escaped level and run values a decoded differently */
i = 0;
{
OPEN_READER(re, &s->gb);
/* now quantify & encode AC coefficients */
for (;;) {
UPDATE_CACHE(re, &s->gb);
GET_RL_VLC(level, run, re, &s->gb, ff_mpeg1_rl_vlc, TEX_VLC_BITS, 2, 0);
if (level == 127) {
break;
} else if (level != 0) {
i += run;
if (i > 63) {
av_log(s->avctx, AV_LOG_ERROR,
"ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
j = scantable[i];
level = (level*quant_matrix[j]) >> 4;
level = (level-1)|1;
level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
} else {
/* escape */
UPDATE_CACHE(re, &s->gb);
level = SHOW_SBITS(re, &s->gb, 10); SKIP_BITS(re, &s->gb, 10);
UPDATE_CACHE(re, &s->gb);
run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6);
i += run;
if (i > 63) {
av_log(s->avctx, AV_LOG_ERROR,
"ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
return -1;
}
j = scantable[i];
if (level < 0) {
level = -level;
level = (level*quant_matrix[j]) >> 4;
level = (level-1)|1;
level = -level;
} else {
level = (level*quant_matrix[j]) >> 4;
level = (level-1)|1;
}
}
block[j] = level;
}
CLOSE_READER(re, &s->gb);
}
return 0;
}
static int decode_motion(GetBitContext *gb)
{
int value = 0;
if (get_bits1(gb)) {
if (get_bits1(gb))
value = -17;
value += get_bits(gb, 4) + 1;
}
return value;
}
static int decode_mb(MadContext *s, AVFrame *frame, int inter)
{
int mv_map = 0;
int av_uninit(mv_x), av_uninit(mv_y);
int j;
if (inter) {
int v = decode210(&s->gb);
if (v < 2) {
mv_map = v ? get_bits(&s->gb, 6) : 63;
mv_x = decode_motion(&s->gb);
mv_y = decode_motion(&s->gb);
}
}
for (j=0; j<6; j++) {
if (mv_map & (1<<j)) { // mv_x and mv_y are guarded by mv_map
int add = 2*decode_motion(&s->gb);
if (s->last_frame->data[0])
comp_block(s, frame, s->mb_x, s->mb_y, j, mv_x, mv_y, add);
} else {
s->bdsp.clear_block(s->block);
if(decode_block_intra(s, s->block) < 0)
return -1;
idct_put(s, frame, s->block, s->mb_x, s->mb_y, j);
}
}
return 0;
}
static void calc_quant_matrix(MadContext *s, int qscale)
{
int i;
s->quant_matrix[0] = (ff_inv_aanscales[0]*ff_mpeg1_default_intra_matrix[0]) >> 11;
for (i=1; i<64; i++)
s->quant_matrix[i] = (ff_inv_aanscales[i]*ff_mpeg1_default_intra_matrix[i]*qscale + 32) >> 10;
}
static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MadContext *s = avctx->priv_data;
GetByteContext gb;
int width, height;
int chunk_type;
int inter, ret;
bytestream2_init(&gb, buf, buf_size);
chunk_type = bytestream2_get_le32(&gb);
inter = (chunk_type == MADm_TAG || chunk_type == MADe_TAG);
bytestream2_skip(&gb, 10);
av_reduce(&avctx->framerate.den, &avctx->framerate.num,
bytestream2_get_le16(&gb), 1000, 1<<30);
width = bytestream2_get_le16(&gb);
height = bytestream2_get_le16(&gb);
bytestream2_skip(&gb, 1);
calc_quant_matrix(s, bytestream2_get_byte(&gb));
bytestream2_skip(&gb, 2);
if (bytestream2_get_bytes_left(&gb) < 2) {
av_log(avctx, AV_LOG_ERROR, "Input data too small\n");
return AVERROR_INVALIDDATA;
}
if (width < 16 || height < 16) {
av_log(avctx, AV_LOG_ERROR, "Dimensions too small\n");
return AVERROR_INVALIDDATA;
}
if (avctx->width != width || avctx->height != height) {
av_frame_unref(s->last_frame);
if((width * (int64_t)height)/2048*7 > bytestream2_get_bytes_left(&gb))
return AVERROR_INVALIDDATA;
if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
return ret;
}
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
if (inter && !s->last_frame->data[0]) {
av_log(avctx, AV_LOG_WARNING, "Missing reference frame.\n");
ret = ff_get_buffer(avctx, s->last_frame, AV_GET_BUFFER_FLAG_REF);
if (ret < 0)
return ret;
memset(s->last_frame->data[0], 0, s->last_frame->height *
s->last_frame->linesize[0]);
memset(s->last_frame->data[1], 0x80, s->last_frame->height / 2 *
s->last_frame->linesize[1]);
memset(s->last_frame->data[2], 0x80, s->last_frame->height / 2 *
s->last_frame->linesize[2]);
}
av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size,
bytestream2_get_bytes_left(&gb));
if (!s->bitstream_buf)
return AVERROR(ENOMEM);
s->bbdsp.bswap16_buf(s->bitstream_buf, (const uint16_t *)(buf + bytestream2_tell(&gb)),
bytestream2_get_bytes_left(&gb) / 2);
memset((uint8_t*)s->bitstream_buf + bytestream2_get_bytes_left(&gb), 0, AV_INPUT_BUFFER_PADDING_SIZE);
init_get_bits(&s->gb, s->bitstream_buf, 8*(bytestream2_get_bytes_left(&gb)));
for (s->mb_y=0; s->mb_y < (avctx->height+15)/16; s->mb_y++)
for (s->mb_x=0; s->mb_x < (avctx->width +15)/16; s->mb_x++)
if(decode_mb(s, frame, inter) < 0)
return AVERROR_INVALIDDATA;
*got_frame = 1;
if (chunk_type != MADe_TAG) {
if ((ret = av_frame_replace(s->last_frame, frame)) < 0)
return ret;
}
return buf_size;
}
static av_cold int decode_end(AVCodecContext *avctx)
{
MadContext *t = avctx->priv_data;
av_frame_free(&t->last_frame);
av_freep(&t->bitstream_buf);
return 0;
}
const FFCodec ff_eamad_decoder = {
.p.name = "eamad",
CODEC_LONG_NAME("Electronic Arts Madcow Video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MAD,
.priv_data_size = sizeof(MadContext),
.init = decode_init,
.close = decode_end,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
};
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