mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
360 lines
10 KiB
C
360 lines
10 KiB
C
/*
|
|
* Escape 130 video decoder
|
|
* Copyright (C) 2008 Eli Friedman (eli.friedman <at> gmail.com)
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
#define BITSTREAM_READER_LE
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct Escape130Context {
|
|
uint8_t *old_y_avg;
|
|
|
|
uint8_t *new_y, *old_y;
|
|
uint8_t *new_u, *old_u;
|
|
uint8_t *new_v, *old_v;
|
|
|
|
uint8_t *buf1, *buf2;
|
|
int linesize[3];
|
|
} Escape130Context;
|
|
|
|
static const uint8_t offset_table[] = { 2, 4, 10, 20 };
|
|
static const int8_t sign_table[64][4] = {
|
|
{ 0, 0, 0, 0 },
|
|
{ -1, 1, 0, 0 },
|
|
{ 1, -1, 0, 0 },
|
|
{ -1, 0, 1, 0 },
|
|
{ -1, 1, 1, 0 },
|
|
{ 0, -1, 1, 0 },
|
|
{ 1, -1, 1, 0 },
|
|
{ -1, -1, 1, 0 },
|
|
{ 1, 0, -1, 0 },
|
|
{ 0, 1, -1, 0 },
|
|
{ 1, 1, -1, 0 },
|
|
{ -1, 1, -1, 0 },
|
|
{ 1, -1, -1, 0 },
|
|
{ -1, 0, 0, 1 },
|
|
{ -1, 1, 0, 1 },
|
|
{ 0, -1, 0, 1 },
|
|
|
|
{ 0, 0, 0, 0 },
|
|
{ 1, -1, 0, 1 },
|
|
{ -1, -1, 0, 1 },
|
|
{ -1, 0, 1, 1 },
|
|
{ -1, 1, 1, 1 },
|
|
{ 0, -1, 1, 1 },
|
|
{ 1, -1, 1, 1 },
|
|
{ -1, -1, 1, 1 },
|
|
{ 0, 0, -1, 1 },
|
|
{ 1, 0, -1, 1 },
|
|
{ -1, 0, -1, 1 },
|
|
{ 0, 1, -1, 1 },
|
|
{ 1, 1, -1, 1 },
|
|
{ -1, 1, -1, 1 },
|
|
{ 0, -1, -1, 1 },
|
|
{ 1, -1, -1, 1 },
|
|
|
|
{ 0, 0, 0, 0 },
|
|
{ -1, -1, -1, 1 },
|
|
{ 1, 0, 0, -1 },
|
|
{ 0, 1, 0, -1 },
|
|
{ 1, 1, 0, -1 },
|
|
{ -1, 1, 0, -1 },
|
|
{ 1, -1, 0, -1 },
|
|
{ 0, 0, 1, -1 },
|
|
{ 1, 0, 1, -1 },
|
|
{ -1, 0, 1, -1 },
|
|
{ 0, 1, 1, -1 },
|
|
{ 1, 1, 1, -1 },
|
|
{ -1, 1, 1, -1 },
|
|
{ 0, -1, 1, -1 },
|
|
{ 1, -1, 1, -1 },
|
|
{ -1, -1, 1, -1 },
|
|
|
|
{ 0, 0, 0, 0 },
|
|
{ 1, 0, -1, -1 },
|
|
{ 0, 1, -1, -1 },
|
|
{ 1, 1, -1, -1 },
|
|
{ -1, 1, -1, -1 },
|
|
{ 1, -1, -1, -1 }
|
|
};
|
|
|
|
static const int8_t luma_adjust[] = { -4, -3, -2, -1, 1, 2, 3, 4 };
|
|
|
|
static const int8_t chroma_adjust[2][8] = {
|
|
{ 1, 1, 0, -1, -1, -1, 0, 1 },
|
|
{ 0, 1, 1, 1, 0, -1, -1, -1 }
|
|
};
|
|
|
|
static const uint8_t chroma_vals[] = {
|
|
20, 28, 36, 44, 52, 60, 68, 76,
|
|
84, 92, 100, 106, 112, 116, 120, 124,
|
|
128, 132, 136, 140, 144, 150, 156, 164,
|
|
172, 180, 188, 196, 204, 212, 220, 228
|
|
};
|
|
|
|
static av_cold int escape130_decode_init(AVCodecContext *avctx)
|
|
{
|
|
Escape130Context *s = avctx->priv_data;
|
|
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
|
|
|
|
if ((avctx->width & 1) || (avctx->height & 1)) {
|
|
av_log(avctx, AV_LOG_ERROR,
|
|
"Dimensions should be a multiple of two.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
s->old_y_avg = av_malloc(avctx->width * avctx->height / 4);
|
|
s->buf1 = av_malloc(avctx->width * avctx->height * 3 / 2);
|
|
s->buf2 = av_malloc(avctx->width * avctx->height * 3 / 2);
|
|
if (!s->old_y_avg || !s->buf1 || !s->buf2) {
|
|
av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n");
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
s->linesize[0] = avctx->width;
|
|
s->linesize[1] =
|
|
s->linesize[2] = avctx->width / 2;
|
|
|
|
s->new_y = s->buf1;
|
|
s->new_u = s->new_y + avctx->width * avctx->height;
|
|
s->new_v = s->new_u + avctx->width * avctx->height / 4;
|
|
s->old_y = s->buf2;
|
|
s->old_u = s->old_y + avctx->width * avctx->height;
|
|
s->old_v = s->old_u + avctx->width * avctx->height / 4;
|
|
memset(s->old_y, 0, avctx->width * avctx->height);
|
|
memset(s->old_u, 0x10, avctx->width * avctx->height / 4);
|
|
memset(s->old_v, 0x10, avctx->width * avctx->height / 4);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int escape130_decode_close(AVCodecContext *avctx)
|
|
{
|
|
Escape130Context *s = avctx->priv_data;
|
|
|
|
av_freep(&s->old_y_avg);
|
|
av_freep(&s->buf1);
|
|
av_freep(&s->buf2);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_skip_count(GetBitContext* gb)
|
|
{
|
|
int value;
|
|
|
|
if (get_bits_left(gb) < 1+3)
|
|
return -1;
|
|
|
|
value = get_bits1(gb);
|
|
if (value)
|
|
return 0;
|
|
|
|
value = get_bits(gb, 3);
|
|
if (value)
|
|
return value;
|
|
|
|
value = get_bits(gb, 8);
|
|
if (value)
|
|
return value + 7;
|
|
|
|
value = get_bits(gb, 15);
|
|
if (value)
|
|
return value + 262;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int escape130_decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
int buf_size = avpkt->size;
|
|
Escape130Context *s = avctx->priv_data;
|
|
AVFrame *pic = data;
|
|
GetBitContext gb;
|
|
int ret;
|
|
|
|
uint8_t *old_y, *old_cb, *old_cr,
|
|
*new_y, *new_cb, *new_cr;
|
|
uint8_t *dstY, *dstU, *dstV;
|
|
unsigned old_y_stride, old_cb_stride, old_cr_stride,
|
|
new_y_stride, new_cb_stride, new_cr_stride;
|
|
unsigned total_blocks = avctx->width * avctx->height / 4,
|
|
block_index, block_x = 0;
|
|
unsigned y[4] = { 0 }, cb = 0x10, cr = 0x10;
|
|
int skip = -1, y_avg = 0, i, j;
|
|
uint8_t *ya = s->old_y_avg;
|
|
|
|
// first 16 bytes are header; no useful information in here
|
|
if (buf_size <= 16) {
|
|
av_log(avctx, AV_LOG_ERROR, "Insufficient frame data\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
|
|
return ret;
|
|
|
|
if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
|
|
return ret;
|
|
skip_bits_long(&gb, 16 * 8);
|
|
|
|
new_y = s->new_y;
|
|
new_cb = s->new_u;
|
|
new_cr = s->new_v;
|
|
new_y_stride = s->linesize[0];
|
|
new_cb_stride = s->linesize[1];
|
|
new_cr_stride = s->linesize[2];
|
|
old_y = s->old_y;
|
|
old_cb = s->old_u;
|
|
old_cr = s->old_v;
|
|
old_y_stride = s->linesize[0];
|
|
old_cb_stride = s->linesize[1];
|
|
old_cr_stride = s->linesize[2];
|
|
|
|
for (block_index = 0; block_index < total_blocks; block_index++) {
|
|
// Note that this call will make us skip the rest of the blocks
|
|
// if the frame ends prematurely.
|
|
if (skip == -1)
|
|
skip = decode_skip_count(&gb);
|
|
if (skip == -1) {
|
|
av_log(avctx, AV_LOG_ERROR, "Error decoding skip value\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (skip) {
|
|
y[0] = old_y[0];
|
|
y[1] = old_y[1];
|
|
y[2] = old_y[old_y_stride];
|
|
y[3] = old_y[old_y_stride + 1];
|
|
y_avg = ya[0];
|
|
cb = old_cb[0];
|
|
cr = old_cr[0];
|
|
} else {
|
|
if (get_bits1(&gb)) {
|
|
unsigned sign_selector = get_bits(&gb, 6);
|
|
unsigned difference_selector = get_bits(&gb, 2);
|
|
y_avg = 2 * get_bits(&gb, 5);
|
|
for (i = 0; i < 4; i++) {
|
|
y[i] = av_clip(y_avg + offset_table[difference_selector] *
|
|
sign_table[sign_selector][i], 0, 63);
|
|
}
|
|
} else if (get_bits1(&gb)) {
|
|
if (get_bits1(&gb)) {
|
|
y_avg = get_bits(&gb, 6);
|
|
} else {
|
|
unsigned adjust_index = get_bits(&gb, 3);
|
|
y_avg = (y_avg + luma_adjust[adjust_index]) & 63;
|
|
}
|
|
for (i = 0; i < 4; i++)
|
|
y[i] = y_avg;
|
|
}
|
|
|
|
if (get_bits1(&gb)) {
|
|
if (get_bits1(&gb)) {
|
|
cb = get_bits(&gb, 5);
|
|
cr = get_bits(&gb, 5);
|
|
} else {
|
|
unsigned adjust_index = get_bits(&gb, 3);
|
|
cb = (cb + chroma_adjust[0][adjust_index]) & 31;
|
|
cr = (cr + chroma_adjust[1][adjust_index]) & 31;
|
|
}
|
|
}
|
|
}
|
|
*ya++ = y_avg;
|
|
|
|
new_y[0] = y[0];
|
|
new_y[1] = y[1];
|
|
new_y[new_y_stride] = y[2];
|
|
new_y[new_y_stride + 1] = y[3];
|
|
*new_cb = cb;
|
|
*new_cr = cr;
|
|
|
|
old_y += 2;
|
|
old_cb++;
|
|
old_cr++;
|
|
new_y += 2;
|
|
new_cb++;
|
|
new_cr++;
|
|
block_x++;
|
|
if (block_x * 2 == avctx->width) {
|
|
block_x = 0;
|
|
old_y += old_y_stride * 2 - avctx->width;
|
|
old_cb += old_cb_stride - avctx->width / 2;
|
|
old_cr += old_cr_stride - avctx->width / 2;
|
|
new_y += new_y_stride * 2 - avctx->width;
|
|
new_cb += new_cb_stride - avctx->width / 2;
|
|
new_cr += new_cr_stride - avctx->width / 2;
|
|
}
|
|
|
|
skip--;
|
|
}
|
|
|
|
new_y = s->new_y;
|
|
new_cb = s->new_u;
|
|
new_cr = s->new_v;
|
|
dstY = pic->data[0];
|
|
dstU = pic->data[1];
|
|
dstV = pic->data[2];
|
|
for (j = 0; j < avctx->height; j++) {
|
|
for (i = 0; i < avctx->width; i++)
|
|
dstY[i] = new_y[i] << 2;
|
|
dstY += pic->linesize[0];
|
|
new_y += new_y_stride;
|
|
}
|
|
for (j = 0; j < avctx->height / 2; j++) {
|
|
for (i = 0; i < avctx->width / 2; i++) {
|
|
dstU[i] = chroma_vals[new_cb[i]];
|
|
dstV[i] = chroma_vals[new_cr[i]];
|
|
}
|
|
dstU += pic->linesize[1];
|
|
dstV += pic->linesize[2];
|
|
new_cb += new_cb_stride;
|
|
new_cr += new_cr_stride;
|
|
}
|
|
|
|
ff_dlog(avctx, "Frame data: provided %d bytes, used %d bytes\n",
|
|
buf_size, get_bits_count(&gb) >> 3);
|
|
|
|
FFSWAP(uint8_t*, s->old_y, s->new_y);
|
|
FFSWAP(uint8_t*, s->old_u, s->new_u);
|
|
FFSWAP(uint8_t*, s->old_v, s->new_v);
|
|
|
|
*got_frame = 1;
|
|
|
|
return buf_size;
|
|
}
|
|
|
|
const AVCodec ff_escape130_decoder = {
|
|
.name = "escape130",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Escape 130"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_ESCAPE130,
|
|
.priv_data_size = sizeof(Escape130Context),
|
|
.init = escape130_decode_init,
|
|
.close = escape130_decode_close,
|
|
.decode = escape130_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
|
|
};
|