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Diffstat (limited to 'ffmpeg1/libavcodec/xfacedec.c')
| -rw-r--r-- | ffmpeg1/libavcodec/xfacedec.c | 188 |
1 files changed, 0 insertions, 188 deletions
diff --git a/ffmpeg1/libavcodec/xfacedec.c b/ffmpeg1/libavcodec/xfacedec.c deleted file mode 100644 index fbaabdb..0000000 --- a/ffmpeg1/libavcodec/xfacedec.c +++ /dev/null @@ -1,188 +0,0 @@ -/* - * 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", - .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 }, - .long_name = NULL_IF_CONFIG_SMALL("X-face image"), -}; |