| /* |
| * 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 "internal.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; |
| 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 += 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'; |
| |
| 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 (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; |
| } |