mirror of
https://git.videolan.org/git/ffmpeg.git
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189 lines
5.8 KiB
C
189 lines
5.8 KiB
C
/*
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* Copyright (c) 1990 James Ashton - Sydney University
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* Copyright (c) 2012 Stefano Sabatini
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* X-Face decoder, based on libcompface, by James Ashton.
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*/
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#include "libavutil/pixdesc.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "xface.h"
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static int pop_integer(BigInt *b, const ProbRange *pranges)
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{
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uint8_t r;
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int i;
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/* extract the last byte into r, and shift right b by 8 bits */
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ff_big_div(b, 0, &r);
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i = 0;
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while (r < pranges->offset || r >= pranges->range + pranges->offset) {
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pranges++;
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i++;
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}
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ff_big_mul(b, pranges->range);
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ff_big_add(b, r - pranges->offset);
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return i;
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}
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static void pop_greys(BigInt *b, char *bitmap, int w, int h)
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{
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if (w > 3) {
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w /= 2;
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h /= 2;
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pop_greys(b, bitmap, w, h);
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pop_greys(b, bitmap + w, w, h);
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pop_greys(b, bitmap + XFACE_WIDTH * h, w, h);
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pop_greys(b, bitmap + XFACE_WIDTH * h + w, w, h);
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} else {
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w = pop_integer(b, ff_xface_probranges_2x2);
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if (w & 1) bitmap[0] = 1;
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if (w & 2) bitmap[1] = 1;
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if (w & 4) bitmap[XFACE_WIDTH] = 1;
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if (w & 8) bitmap[XFACE_WIDTH + 1] = 1;
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}
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}
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static void decode_block(BigInt *b, char *bitmap, int w, int h, int level)
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{
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switch (pop_integer(b, &ff_xface_probranges_per_level[level][0])) {
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case XFACE_COLOR_WHITE:
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return;
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case XFACE_COLOR_BLACK:
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pop_greys(b, bitmap, w, h);
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return;
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default:
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w /= 2;
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h /= 2;
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level++;
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decode_block(b, bitmap, w, h, level);
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decode_block(b, bitmap + w, w, h, level);
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decode_block(b, bitmap + h * XFACE_WIDTH, w, h, level);
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decode_block(b, bitmap + w + h * XFACE_WIDTH, w, h, level);
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return;
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}
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}
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typedef struct XFaceContext {
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uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding
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} XFaceContext;
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static av_cold int xface_decode_init(AVCodecContext *avctx)
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{
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if (avctx->width || avctx->height) {
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if (avctx->width != XFACE_WIDTH || avctx->height != XFACE_HEIGHT) {
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av_log(avctx, AV_LOG_ERROR,
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"Size value %dx%d not supported, only accepts a size of %dx%d\n",
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avctx->width, avctx->height, XFACE_WIDTH, XFACE_HEIGHT);
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return AVERROR(EINVAL);
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}
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}
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avctx->width = XFACE_WIDTH;
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avctx->height = XFACE_HEIGHT;
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avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
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return 0;
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}
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static int xface_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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XFaceContext *xface = avctx->priv_data;
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int ret, i, j, k;
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uint8_t byte;
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BigInt b = {0};
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char *buf;
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int64_t c;
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AVFrame *frame = data;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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for (i = 0, k = 0; avpkt->data[i] && i < avpkt->size; i++) {
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c = avpkt->data[i];
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/* ignore invalid digits */
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if (c < XFACE_FIRST_PRINT || c > XFACE_LAST_PRINT)
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continue;
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if (++k > XFACE_MAX_DIGITS) {
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av_log(avctx, AV_LOG_WARNING,
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"Buffer is longer than expected, truncating at byte %d\n", i);
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break;
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}
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ff_big_mul(&b, XFACE_PRINTS);
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ff_big_add(&b, c - XFACE_FIRST_PRINT);
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}
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/* decode image and put it in bitmap */
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memset(xface->bitmap, 0, XFACE_PIXELS);
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buf = xface->bitmap;
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decode_block(&b, buf, 16, 16, 0);
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decode_block(&b, buf + 16, 16, 16, 0);
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decode_block(&b, buf + 32, 16, 16, 0);
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decode_block(&b, buf + XFACE_WIDTH * 16, 16, 16, 0);
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decode_block(&b, buf + XFACE_WIDTH * 16 + 16, 16, 16, 0);
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decode_block(&b, buf + XFACE_WIDTH * 16 + 32, 16, 16, 0);
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decode_block(&b, buf + XFACE_WIDTH * 32 , 16, 16, 0);
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decode_block(&b, buf + XFACE_WIDTH * 32 + 16, 16, 16, 0);
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decode_block(&b, buf + XFACE_WIDTH * 32 + 32, 16, 16, 0);
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ff_xface_generate_face(xface->bitmap, xface->bitmap);
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/* convert image from 1=black 0=white bitmap to MONOWHITE */
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buf = frame->data[0];
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for (i = 0, j = 0, k = 0, byte = 0; i < XFACE_PIXELS; i++) {
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byte += xface->bitmap[i];
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if (k == 7) {
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buf[j++] = byte;
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byte = k = 0;
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} else {
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k++;
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byte <<= 1;
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}
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if (j == XFACE_WIDTH/8) {
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j = 0;
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buf += frame->linesize[0];
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}
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}
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_xface_decoder = {
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.name = "xface",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_XFACE,
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.priv_data_size = sizeof(XFaceContext),
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.init = xface_decode_init,
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.decode = xface_decode_frame,
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.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE, AV_PIX_FMT_NONE },
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.long_name = NULL_IF_CONFIG_SMALL("X-face image"),
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};
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