/* * 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 encoder, based on libcompface, by James Ashton. */ #include "xface.h" #include "avcodec.h" #include "codec_internal.h" #include "encode.h" #include "libavutil/avassert.h" typedef struct XFaceContext { AVClass *class; uint8_t bitmap[XFACE_PIXELS]; ///< image used internally for decoding int max_line_len; ///< max line length for compressed data int set_header; ///< set X-Face header in the output } XFaceContext; static int all_same(char *bitmap, int w, int h) { char val, *row; int x; val = *bitmap; while (h--) { row = bitmap; x = w; while (x--) if (*(row++) != val) return 0; bitmap += XFACE_WIDTH; } return 1; } static int all_black(char *bitmap, int w, int h) { if (w > 3) { w /= 2; h /= 2; return (all_black(bitmap, w, h) && all_black(bitmap + w, w, h) && all_black(bitmap + XFACE_WIDTH * h, w, h) && all_black(bitmap + XFACE_WIDTH * h + w, w, h)); } else { /* at least one pixel in the 2x2 grid is non-zero */ return *bitmap || *(bitmap + 1) || *(bitmap + XFACE_WIDTH) || *(bitmap + XFACE_WIDTH + 1); } } static int all_white(char *bitmap, int w, int h) { return *bitmap == 0 && all_same(bitmap, w, h); } typedef struct { ProbRange prob_ranges[XFACE_PIXELS*2]; int prob_ranges_idx; } ProbRangesQueue; static inline int pq_push(ProbRangesQueue *pq, const ProbRange *p) { if (pq->prob_ranges_idx >= XFACE_PIXELS * 2 - 1) return -1; pq->prob_ranges[pq->prob_ranges_idx++] = *p; return 0; } static void push_greys(ProbRangesQueue *pq, char *bitmap, int w, int h) { if (w > 3) { w /= 2; h /= 2; push_greys(pq, bitmap, w, h); push_greys(pq, bitmap + w, w, h); push_greys(pq, bitmap + XFACE_WIDTH * h, w, h); push_greys(pq, bitmap + XFACE_WIDTH * h + w, w, h); } else { const ProbRange *p = ff_xface_probranges_2x2 + *bitmap + 2 * *(bitmap + 1) + 4 * *(bitmap + XFACE_WIDTH) + 8 * *(bitmap + XFACE_WIDTH + 1); pq_push(pq, p); } } static void encode_block(char *bitmap, int w, int h, int level, ProbRangesQueue *pq) { if (all_white(bitmap, w, h)) { pq_push(pq, &ff_xface_probranges_per_level[level][XFACE_COLOR_WHITE]); } else if (all_black(bitmap, w, h)) { pq_push(pq, &ff_xface_probranges_per_level[level][XFACE_COLOR_BLACK]); push_greys(pq, bitmap, w, h); } else { pq_push(pq, &ff_xface_probranges_per_level[level][XFACE_COLOR_GREY]); w /= 2; h /= 2; level++; encode_block(bitmap, w, h, level, pq); encode_block(bitmap + w, w, h, level, pq); encode_block(bitmap + h * XFACE_WIDTH, w, h, level, pq); encode_block(bitmap + w + h * XFACE_WIDTH, w, h, level, pq); } } static void push_integer(BigInt *b, const ProbRange *prange) { uint8_t r; ff_big_div(b, prange->range, &r); ff_big_mul(b, 0); ff_big_add(b, r + prange->offset); } static int xface_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *frame, int *got_packet) { XFaceContext *xface = avctx->priv_data; ProbRangesQueue pq = {{{ 0 }}, 0}; uint8_t bitmap_copy[XFACE_PIXELS]; BigInt b = {0}; int i, j, k, ret = 0; const uint8_t *buf; uint8_t *p; char intbuf[XFACE_MAX_DIGITS]; 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; /* convert image from MONOWHITE to 1=black 0=white bitmap */ buf = frame->data[0]; i = j = 0; do { for (k = 0; k < 8; k++) xface->bitmap[i++] = (buf[j]>>(7-k))&1; if (++j == XFACE_WIDTH/8) { buf += frame->linesize[0]; j = 0; } } while (i < XFACE_PIXELS); /* create a copy of bitmap */ memcpy(bitmap_copy, xface->bitmap, XFACE_PIXELS); ff_xface_generate_face(xface->bitmap, bitmap_copy); encode_block(xface->bitmap, 16, 16, 0, &pq); encode_block(xface->bitmap + 16, 16, 16, 0, &pq); encode_block(xface->bitmap + 32, 16, 16, 0, &pq); encode_block(xface->bitmap + XFACE_WIDTH * 16, 16, 16, 0, &pq); encode_block(xface->bitmap + XFACE_WIDTH * 16 + 16, 16, 16, 0, &pq); encode_block(xface->bitmap + XFACE_WIDTH * 16 + 32, 16, 16, 0, &pq); encode_block(xface->bitmap + XFACE_WIDTH * 32, 16, 16, 0, &pq); encode_block(xface->bitmap + XFACE_WIDTH * 32 + 16, 16, 16, 0, &pq); encode_block(xface->bitmap + XFACE_WIDTH * 32 + 32, 16, 16, 0, &pq); while (pq.prob_ranges_idx > 0) push_integer(&b, &pq.prob_ranges[--pq.prob_ranges_idx]); /* write the inverted big integer in b to intbuf */ i = 0; av_assert0(b.nb_words < XFACE_MAX_WORDS); while (b.nb_words) { uint8_t r; ff_big_div(&b, XFACE_PRINTS, &r); av_assert0(i < sizeof(intbuf)); intbuf[i++] = r + XFACE_FIRST_PRINT; } if ((ret = ff_get_encode_buffer(avctx, pkt, i + 2, 0)) < 0) return ret; /* revert the number, and close the buffer */ p = pkt->data; while (--i >= 0) *(p++) = intbuf[i]; *(p++) = '\n'; *(p++) = 0; *got_packet = 1; return 0; } const FFCodec ff_xface_encoder = { .p.name = "xface", CODEC_LONG_NAME("X-face image"), .p.type = AVMEDIA_TYPE_VIDEO, .p.id = AV_CODEC_ID_XFACE, .p.capabilities = AV_CODEC_CAP_DR1, .p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_MONOWHITE, AV_PIX_FMT_NONE }, .priv_data_size = sizeof(XFaceContext), FF_CODEC_ENCODE_CB(xface_encode_frame), };