diff options
Diffstat (limited to 'ffmpeg/libavcodec/pnm.c')
| -rw-r--r-- | ffmpeg/libavcodec/pnm.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/pnm.c b/ffmpeg/libavcodec/pnm.c new file mode 100644 index 0000000..33b8896 --- /dev/null +++ b/ffmpeg/libavcodec/pnm.c @@ -0,0 +1,204 @@ +/* + * 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/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 */ + while (sc->bytestream < sc->bytestream_end) { + c = *sc->bytestream++; + if (c == '#') { + while (c != '\n' && sc->bytestream < sc->bytestream_end) { + c = *sc->bytestream++; + } + } 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 AVERROR_INVALIDDATA; + + 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; + } + } + /* 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) || s->bytestream >= s->bytestream_end) + return AVERROR_INVALIDDATA; + + avctx->width = w; + avctx->height = h; + s->maxval = maxval; + if (depth == 1) { + if (maxval == 1) { + avctx->pix_fmt = AV_PIX_FMT_MONOBLACK; + } else if (maxval == 255) { + avctx->pix_fmt = AV_PIX_FMT_GRAY8; + } else { + avctx->pix_fmt = AV_PIX_FMT_GRAY16BE; + } + } else if (depth == 2) { + if (maxval == 255) + avctx->pix_fmt = AV_PIX_FMT_GRAY8A; + } else if (depth == 3) { + if (maxval < 256) { + avctx->pix_fmt = AV_PIX_FMT_RGB24; + } else { + avctx->pix_fmt = AV_PIX_FMT_RGB48BE; + } + } else if (depth == 4) { + if (maxval < 256) { + avctx->pix_fmt = AV_PIX_FMT_RGBA; + } else { + avctx->pix_fmt = AV_PIX_FMT_RGBA64BE; + } + } else { + return AVERROR_INVALIDDATA; + } + return 0; + } else { + return AVERROR_INVALIDDATA; + } + 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; + + avctx->width = w; + avctx->height = h; + + 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) { + 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_GRAY16BE; + } else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) { + avctx->pix_fmt = AV_PIX_FMT_RGB48BE; + } else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) { + if (s->maxval < 512) + avctx->pix_fmt = AV_PIX_FMT_YUV420P9BE; + else if (s->maxval < 1024) + avctx->pix_fmt = AV_PIX_FMT_YUV420P10BE; + 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; + /* more check if YUV420 */ + if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & PIX_FMT_PLANAR) { + 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; +} + +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; +} |