/* * PNM image format * Copyright (c) 2002, 2003 Fabrice Bellard * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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/imgutils.h" #include "avcodec.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; /* skip spaces and comments */ for (;;) { c = *sc->bytestream++; if (c == '#') { do { c = *sc->bytestream++; } while (c != '\n' && sc->bytestream < sc->bytestream_end); } else if (!pnm_space(c)) { break; } } s = str; while (sc->bytestream < sc->bytestream_end && !pnm_space(c)) { if ((s - str) < buf_size - 1) *s++ = c; c = *sc->bytestream++; } *s = '\0'; } int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s) { char buf1[32], tuple_type[32]; int h, w, depth, maxval; pnm_get(s, buf1, sizeof(buf1)); s->type= buf1[1]-'0'; if(buf1[0] != 'P') return -1; if (s->type==1 || s->type==4) { avctx->pix_fmt = PIX_FMT_MONOWHITE; } else if (s->type==2 || s->type==5) { if (avctx->codec_id == AV_CODEC_ID_PGMYUV) avctx->pix_fmt = PIX_FMT_YUV420P; else avctx->pix_fmt = PIX_FMT_GRAY8; } else if (s->type==3 || s->type==6) { avctx->pix_fmt = 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 -1; } } /* check that all tags are present */ if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] == '\0' || av_image_check_size(w, h, 0, avctx)) return -1; avctx->width = w; avctx->height = h; if (depth == 1) { if (maxval == 1) avctx->pix_fmt = PIX_FMT_MONOWHITE; else avctx->pix_fmt = PIX_FMT_GRAY8; } else if (depth == 3) { if (maxval < 256) { avctx->pix_fmt = PIX_FMT_RGB24; } else { av_log(avctx, AV_LOG_ERROR, "16-bit components are only supported for grayscale\n"); avctx->pix_fmt = PIX_FMT_NONE; return -1; } } else if (depth == 4) { avctx->pix_fmt = PIX_FMT_RGB32; } else { return -1; } return 0; } else { return -1; } pnm_get(s, buf1, sizeof(buf1)); avctx->width = atoi(buf1); if (avctx->width <= 0) return -1; pnm_get(s, buf1, sizeof(buf1)); avctx->height = atoi(buf1); if(av_image_check_size(avctx->width, avctx->height, 0, avctx)) return -1; if (avctx->pix_fmt != PIX_FMT_MONOWHITE) { pnm_get(s, buf1, sizeof(buf1)); s->maxval = atoi(buf1); if (s->maxval <= 0) { av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval); s->maxval = 255; } if (s->maxval >= 256) { if (avctx->pix_fmt == PIX_FMT_GRAY8) { avctx->pix_fmt = PIX_FMT_GRAY16BE; if (s->maxval != 65535) avctx->pix_fmt = PIX_FMT_GRAY16; } else if (avctx->pix_fmt == PIX_FMT_RGB24) { if (s->maxval > 255) avctx->pix_fmt = PIX_FMT_RGB48BE; } else { av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n"); avctx->pix_fmt = PIX_FMT_NONE; return -1; } } }else s->maxval=1; /* more check if YUV420 */ if (avctx->pix_fmt == PIX_FMT_YUV420P) { if ((avctx->width & 1) != 0) return -1; h = (avctx->height * 2); if ((h % 3) != 0) return -1; h /= 3; avctx->height = h; } return 0; } av_cold int ff_pnm_end(AVCodecContext *avctx) { PNMContext *s = avctx->priv_data; if (s->picture.data[0]) avctx->release_buffer(avctx, &s->picture); return 0; } av_cold int ff_pnm_init(AVCodecContext *avctx) { PNMContext *s = avctx->priv_data; avcodec_get_frame_defaults(&s->picture); avctx->coded_frame = &s->picture; return 0; }