/* * PNM image format * Copyright (c) 2002, 2003 Fabrice Bellard * * 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 <stdlib.h> #include <string.h> #include "libavutil/avassert.h" #include "libavutil/imgutils.h" #include "libavutil/avstring.h" #include "avcodec.h" #include "decode.h" #include "pnm.h" static inline int pnm_space(int c) { return c == ' ' || c == '\n' || c == '\r' || c == '\t'; } static void pnm_get(PNMContext *sc, char *str, int buf_size) { char *s; int c; const uint8_t *bs = sc->bytestream; const uint8_t *end = sc->bytestream_end; /* skip spaces and comments */ while (bs < end) { c = *bs++; if (c == '#') { while (c != '\n' && bs < end) { c = *bs++; } } else if (!pnm_space(c)) { break; } } s = str; while (bs < end && !pnm_space(c) && (s - str) < buf_size - 1) { *s++ = c; c = *bs++; } *s = '\0'; sc->bytestream = bs; } int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s) { char buf1[32], tuple_type[32]; int h, w, depth, maxval; int ret; if (s->bytestream_end - s->bytestream < 3 || s->bytestream[0] != 'P' || (s->bytestream[1] < '1' || s->bytestream[1] > '7' && s->bytestream[1] != 'f' && s->bytestream[1] != 'F' && s->bytestream[1] != 'H' && s->bytestream[1] != 'h')) { s->bytestream += s->bytestream_end > s->bytestream; s->bytestream += s->bytestream_end > s->bytestream; return AVERROR_INVALIDDATA; } pnm_get(s, buf1, sizeof(buf1)); s->type= buf1[1]-'0'; s->half = 0; if (buf1[1] == 'F') { avctx->pix_fmt = AV_PIX_FMT_GBRPF32; } else if (buf1[1] == 'f') { avctx->pix_fmt = AV_PIX_FMT_GRAYF32; } else if (buf1[1] == 'H') { avctx->pix_fmt = AV_PIX_FMT_GBRPF32; s->half = 1; } else if (buf1[1] == 'h') { avctx->pix_fmt = AV_PIX_FMT_GRAYF32; s->half = 1; } else if (s->type==1 || s->type==4) { avctx->pix_fmt = AV_PIX_FMT_MONOWHITE; } else if (s->type==2 || s->type==5) { if (avctx->codec_id == AV_CODEC_ID_PGMYUV) avctx->pix_fmt = AV_PIX_FMT_YUV420P; else avctx->pix_fmt = AV_PIX_FMT_GRAY8; } else if (s->type==3 || s->type==6) { avctx->pix_fmt = AV_PIX_FMT_RGB24; } else if (s->type==7) { w = -1; h = -1; maxval = -1; depth = -1; tuple_type[0] = '\0'; for (;;) { pnm_get(s, buf1, sizeof(buf1)); if (!strcmp(buf1, "WIDTH")) { pnm_get(s, buf1, sizeof(buf1)); w = strtol(buf1, NULL, 10); } else if (!strcmp(buf1, "HEIGHT")) { pnm_get(s, buf1, sizeof(buf1)); h = strtol(buf1, NULL, 10); } else if (!strcmp(buf1, "DEPTH")) { pnm_get(s, buf1, sizeof(buf1)); depth = strtol(buf1, NULL, 10); } else if (!strcmp(buf1, "MAXVAL")) { pnm_get(s, buf1, sizeof(buf1)); maxval = strtol(buf1, NULL, 10); } else if (!strcmp(buf1, "TUPLTYPE") || /* libavcodec used to write invalid files */ !strcmp(buf1, "TUPLETYPE")) { pnm_get(s, tuple_type, sizeof(tuple_type)); } else if (!strcmp(buf1, "ENDHDR")) { break; } else { return AVERROR_INVALIDDATA; } } if (!pnm_space(s->bytestream[-1])) return AVERROR_INVALIDDATA; /* check that all tags are present */ if (w <= 0 || h <= 0 || maxval <= 0 || maxval > UINT16_MAX || depth <= 0 || tuple_type[0] == '\0' || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end) return AVERROR_INVALIDDATA; ret = ff_set_dimensions(avctx, w, h); if (ret < 0) return ret; s->maxval = maxval; if (depth == 1) { if (maxval == 1) { avctx->pix_fmt = AV_PIX_FMT_MONOBLACK; } else if (maxval < 256) { avctx->pix_fmt = AV_PIX_FMT_GRAY8; } else { avctx->pix_fmt = AV_PIX_FMT_GRAY16; } } else if (depth == 2) { if (maxval < 256) { avctx->pix_fmt = AV_PIX_FMT_GRAY8A; } else { avctx->pix_fmt = AV_PIX_FMT_YA16; } } else if (depth == 3) { if (maxval < 256) { avctx->pix_fmt = AV_PIX_FMT_RGB24; } else { avctx->pix_fmt = AV_PIX_FMT_RGB48; } } else if (depth == 4) { if (maxval < 256) { avctx->pix_fmt = AV_PIX_FMT_RGBA; } else { avctx->pix_fmt = AV_PIX_FMT_RGBA64; } } else { return AVERROR_INVALIDDATA; } return 0; } else { av_assert0(0); } pnm_get(s, buf1, sizeof(buf1)); w = atoi(buf1); pnm_get(s, buf1, sizeof(buf1)); h = atoi(buf1); if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end) return AVERROR_INVALIDDATA; ret = ff_set_dimensions(avctx, w, h); if (ret < 0) return ret; if (avctx->pix_fmt == AV_PIX_FMT_GBRPF32 || avctx->pix_fmt == AV_PIX_FMT_GRAYF32) { pnm_get(s, buf1, sizeof(buf1)); if (av_sscanf(buf1, "%f", &s->scale) != 1 || s->scale == 0.0 || !isfinite(s->scale)) { av_log(avctx, AV_LOG_ERROR, "Invalid scale.\n"); return AVERROR_INVALIDDATA; } s->endian = s->scale < 0.f; s->scale = fabsf(s->scale); s->maxval = (1ULL << 32) - 1; } else if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) { pnm_get(s, buf1, sizeof(buf1)); s->maxval = atoi(buf1); if (s->maxval <= 0 || s->maxval > UINT16_MAX) { av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval); s->maxval = 255; } if (s->maxval >= 256) { if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) { avctx->pix_fmt = AV_PIX_FMT_GRAY16; } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) { avctx->pix_fmt = AV_PIX_FMT_RGB48; } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) { if (s->maxval < 512) avctx->pix_fmt = AV_PIX_FMT_YUV420P9; else if (s->maxval < 1024) avctx->pix_fmt = AV_PIX_FMT_YUV420P10; else avctx->pix_fmt = AV_PIX_FMT_YUV420P16; } else { av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n"); avctx->pix_fmt = AV_PIX_FMT_NONE; return AVERROR_INVALIDDATA; } } }else s->maxval=1; if (!pnm_space(s->bytestream[-1])) return AVERROR_INVALIDDATA; /* more check if YUV420 */ if ((av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) && avctx->pix_fmt != AV_PIX_FMT_GBRPF32) { if ((avctx->width & 1) != 0) return AVERROR_INVALIDDATA; h = (avctx->height * 2); if ((h % 3) != 0) return AVERROR_INVALIDDATA; h /= 3; avctx->height = h; } return 0; }