0,0 → 1,188 |
/* |
* Copyright (c) 1990 James Ashton - Sydney University |
* Copyright (c) 2012 Stefano Sabatini |
* |
* 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 |
* X-Face decoder, based on libcompface, by James Ashton. |
*/ |
|
#include "libavutil/pixdesc.h" |
#include "avcodec.h" |
#include "bytestream.h" |
#include "internal.h" |
#include "xface.h" |
|
static int pop_integer(BigInt *b, const ProbRange *pranges) |
{ |
uint8_t r; |
int i; |
|
/* extract the last byte into r, and shift right b by 8 bits */ |
ff_big_div(b, 0, &r); |
|
i = 0; |
while (r < pranges->offset || r >= pranges->range + pranges->offset) { |
pranges++; |
i++; |
} |
ff_big_mul(b, pranges->range); |
ff_big_add(b, r - pranges->offset); |
return i; |
} |
|
static void pop_greys(BigInt *b, char *bitmap, int w, int h) |
{ |
if (w > 3) { |
w /= 2; |
h /= 2; |
pop_greys(b, bitmap, w, h); |
pop_greys(b, bitmap + w, w, h); |
pop_greys(b, bitmap + XFACE_WIDTH * h, w, h); |
pop_greys(b, bitmap + XFACE_WIDTH * h + w, w, h); |
} else { |
w = pop_integer(b, ff_xface_probranges_2x2); |
if (w & 1) bitmap[0] = 1; |
if (w & 2) bitmap[1] = 1; |
if (w & 4) bitmap[XFACE_WIDTH] = 1; |
if (w & 8) bitmap[XFACE_WIDTH + 1] = 1; |
} |
} |
|
static void decode_block(BigInt *b, char *bitmap, int w, int h, int level) |
{ |
switch (pop_integer(b, &ff_xface_probranges_per_level[level][0])) { |
case XFACE_COLOR_WHITE: |
return; |
case XFACE_COLOR_BLACK: |
pop_greys(b, bitmap, w, h); |
return; |
default: |
w /= 2; |
h /= 2; |
level++; |
decode_block(b, bitmap, w, h, level); |
decode_block(b, bitmap + w, w, h, level); |
decode_block(b, bitmap + h * XFACE_WIDTH, w, h, level); |
decode_block(b, bitmap + w + h * XFACE_WIDTH, w, h, level); |
return; |
} |
} |
|
typedef struct XFaceContext { |
uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding |
} XFaceContext; |
|
static av_cold int xface_decode_init(AVCodecContext *avctx) |
{ |
if (avctx->width || avctx->height) { |
if (avctx->width != XFACE_WIDTH || avctx->height != XFACE_HEIGHT) { |
av_log(avctx, AV_LOG_ERROR, |
"Size value %dx%d not supported, only accepts a size of %dx%d\n", |
avctx->width, avctx->height, XFACE_WIDTH, XFACE_HEIGHT); |
return AVERROR(EINVAL); |
} |
} |
|
avctx->width = XFACE_WIDTH; |
avctx->height = XFACE_HEIGHT; |
avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; |
|
return 0; |
} |
|
static int xface_decode_frame(AVCodecContext *avctx, |
void *data, int *got_frame, |
AVPacket *avpkt) |
{ |
XFaceContext *xface = avctx->priv_data; |
int ret, i, j, k; |
uint8_t byte; |
BigInt b = {0}; |
char *buf; |
int64_t c; |
AVFrame *frame = data; |
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
return ret; |
|
for (i = 0, k = 0; avpkt->data[i] && i < avpkt->size; i++) { |
c = avpkt->data[i]; |
|
/* ignore invalid digits */ |
if (c < XFACE_FIRST_PRINT || c > XFACE_LAST_PRINT) |
continue; |
|
if (++k > XFACE_MAX_DIGITS) { |
av_log(avctx, AV_LOG_WARNING, |
"Buffer is longer than expected, truncating at byte %d\n", i); |
break; |
} |
ff_big_mul(&b, XFACE_PRINTS); |
ff_big_add(&b, c - XFACE_FIRST_PRINT); |
} |
|
/* decode image and put it in bitmap */ |
memset(xface->bitmap, 0, XFACE_PIXELS); |
buf = xface->bitmap; |
decode_block(&b, buf, 16, 16, 0); |
decode_block(&b, buf + 16, 16, 16, 0); |
decode_block(&b, buf + 32, 16, 16, 0); |
decode_block(&b, buf + XFACE_WIDTH * 16, 16, 16, 0); |
decode_block(&b, buf + XFACE_WIDTH * 16 + 16, 16, 16, 0); |
decode_block(&b, buf + XFACE_WIDTH * 16 + 32, 16, 16, 0); |
decode_block(&b, buf + XFACE_WIDTH * 32 , 16, 16, 0); |
decode_block(&b, buf + XFACE_WIDTH * 32 + 16, 16, 16, 0); |
decode_block(&b, buf + XFACE_WIDTH * 32 + 32, 16, 16, 0); |
|
ff_xface_generate_face(xface->bitmap, xface->bitmap); |
|
/* convert image from 1=black 0=white bitmap to MONOWHITE */ |
buf = frame->data[0]; |
for (i = 0, j = 0, k = 0, byte = 0; i < XFACE_PIXELS; i++) { |
byte += xface->bitmap[i]; |
if (k == 7) { |
buf[j++] = byte; |
byte = k = 0; |
} else { |
k++; |
byte <<= 1; |
} |
if (j == XFACE_WIDTH/8) { |
j = 0; |
buf += frame->linesize[0]; |
} |
} |
|
*got_frame = 1; |
|
return avpkt->size; |
} |
|
AVCodec ff_xface_decoder = { |
.name = "xface", |
.long_name = NULL_IF_CONFIG_SMALL("X-face image"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_XFACE, |
.priv_data_size = sizeof(XFaceContext), |
.init = xface_decode_init, |
.decode = xface_decode_frame, |
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE, AV_PIX_FMT_NONE }, |
}; |