232 lines
7.6 KiB
C
232 lines
7.6 KiB
C
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/*
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* PNM image format
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* Copyright (c) 2002, 2003 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "libavutil/avassert.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/avstring.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "pnm.h"
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static inline int pnm_space(int c)
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{
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return c == ' ' || c == '\n' || c == '\r' || c == '\t';
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}
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static void pnm_get(PNMContext *sc, char *str, int buf_size)
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{
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char *s;
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int c;
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uint8_t *bs = sc->bytestream;
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const uint8_t *end = sc->bytestream_end;
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/* skip spaces and comments */
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while (bs < end) {
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c = *bs++;
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if (c == '#') {
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while (c != '\n' && bs < end) {
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c = *bs++;
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}
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} else if (!pnm_space(c)) {
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break;
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}
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}
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s = str;
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while (bs < end && !pnm_space(c) && (s - str) < buf_size - 1) {
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*s++ = c;
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c = *bs++;
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}
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*s = '\0';
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sc->bytestream = bs;
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}
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int ff_pnm_decode_header(AVCodecContext *avctx, PNMContext * const s)
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{
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char buf1[32], tuple_type[32];
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int h, w, depth, maxval;
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int ret;
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if (s->bytestream_end - s->bytestream < 3 ||
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s->bytestream[0] != 'P' ||
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(s->bytestream[1] < '1' ||
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s->bytestream[1] > '7' &&
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s->bytestream[1] != 'F')) {
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s->bytestream += s->bytestream_end > s->bytestream;
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s->bytestream += s->bytestream_end > s->bytestream;
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return AVERROR_INVALIDDATA;
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}
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pnm_get(s, buf1, sizeof(buf1));
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s->type= buf1[1]-'0';
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if (buf1[1] == 'F') {
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avctx->pix_fmt = AV_PIX_FMT_GBRPF32;
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} else if (s->type==1 || s->type==4) {
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avctx->pix_fmt = AV_PIX_FMT_MONOWHITE;
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} else if (s->type==2 || s->type==5) {
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if (avctx->codec_id == AV_CODEC_ID_PGMYUV)
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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else
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avctx->pix_fmt = AV_PIX_FMT_GRAY8;
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} else if (s->type==3 || s->type==6) {
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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} else if (s->type==7) {
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w = -1;
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h = -1;
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maxval = -1;
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depth = -1;
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tuple_type[0] = '\0';
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for (;;) {
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pnm_get(s, buf1, sizeof(buf1));
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if (!strcmp(buf1, "WIDTH")) {
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pnm_get(s, buf1, sizeof(buf1));
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w = strtol(buf1, NULL, 10);
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} else if (!strcmp(buf1, "HEIGHT")) {
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pnm_get(s, buf1, sizeof(buf1));
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h = strtol(buf1, NULL, 10);
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} else if (!strcmp(buf1, "DEPTH")) {
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pnm_get(s, buf1, sizeof(buf1));
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depth = strtol(buf1, NULL, 10);
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} else if (!strcmp(buf1, "MAXVAL")) {
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pnm_get(s, buf1, sizeof(buf1));
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maxval = strtol(buf1, NULL, 10);
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} else if (!strcmp(buf1, "TUPLTYPE") ||
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/* libavcodec used to write invalid files */
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!strcmp(buf1, "TUPLETYPE")) {
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pnm_get(s, tuple_type, sizeof(tuple_type));
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} else if (!strcmp(buf1, "ENDHDR")) {
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break;
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} else {
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return AVERROR_INVALIDDATA;
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}
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}
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if (!pnm_space(s->bytestream[-1]))
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return AVERROR_INVALIDDATA;
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/* check that all tags are present */
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if (w <= 0 || h <= 0 || maxval <= 0 || maxval > UINT16_MAX || depth <= 0 || tuple_type[0] == '\0' ||
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av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
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return AVERROR_INVALIDDATA;
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ret = ff_set_dimensions(avctx, w, h);
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if (ret < 0)
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return ret;
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s->maxval = maxval;
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if (depth == 1) {
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if (maxval == 1) {
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avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
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} else if (maxval < 256) {
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avctx->pix_fmt = AV_PIX_FMT_GRAY8;
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} else {
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avctx->pix_fmt = AV_PIX_FMT_GRAY16;
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}
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} else if (depth == 2) {
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if (maxval < 256) {
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avctx->pix_fmt = AV_PIX_FMT_GRAY8A;
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} else {
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avctx->pix_fmt = AV_PIX_FMT_YA16;
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}
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} else if (depth == 3) {
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if (maxval < 256) {
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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} else {
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avctx->pix_fmt = AV_PIX_FMT_RGB48;
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}
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} else if (depth == 4) {
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if (maxval < 256) {
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avctx->pix_fmt = AV_PIX_FMT_RGBA;
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} else {
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avctx->pix_fmt = AV_PIX_FMT_RGBA64;
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}
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} else {
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return AVERROR_INVALIDDATA;
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}
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return 0;
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} else {
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av_assert0(0);
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}
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pnm_get(s, buf1, sizeof(buf1));
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w = atoi(buf1);
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pnm_get(s, buf1, sizeof(buf1));
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h = atoi(buf1);
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if(w <= 0 || h <= 0 || av_image_check_size(w, h, 0, avctx) || s->bytestream >= s->bytestream_end)
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return AVERROR_INVALIDDATA;
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ret = ff_set_dimensions(avctx, w, h);
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if (ret < 0)
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return ret;
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if (avctx->pix_fmt == AV_PIX_FMT_GBRPF32) {
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pnm_get(s, buf1, sizeof(buf1));
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if (av_sscanf(buf1, "%f", &s->scale) != 1 || s->scale == 0.0 || !isfinite(s->scale)) {
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av_log(avctx, AV_LOG_ERROR, "Invalid scale.\n");
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return AVERROR_INVALIDDATA;
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}
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s->endian = s->scale < 0.f;
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s->scale = fabsf(s->scale);
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s->maxval = (1ULL << 32) - 1;
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} else if (avctx->pix_fmt != AV_PIX_FMT_MONOWHITE && avctx->pix_fmt != AV_PIX_FMT_MONOBLACK) {
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pnm_get(s, buf1, sizeof(buf1));
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s->maxval = atoi(buf1);
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if (s->maxval <= 0 || s->maxval > UINT16_MAX) {
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av_log(avctx, AV_LOG_ERROR, "Invalid maxval: %d\n", s->maxval);
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s->maxval = 255;
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}
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if (s->maxval >= 256) {
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if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
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avctx->pix_fmt = AV_PIX_FMT_GRAY16;
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} else if (avctx->pix_fmt == AV_PIX_FMT_RGB24) {
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avctx->pix_fmt = AV_PIX_FMT_RGB48;
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} else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && s->maxval < 65536) {
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if (s->maxval < 512)
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avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
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else if (s->maxval < 1024)
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avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
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else
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avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
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} else {
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av_log(avctx, AV_LOG_ERROR, "Unsupported pixel format\n");
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avctx->pix_fmt = AV_PIX_FMT_NONE;
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return AVERROR_INVALIDDATA;
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}
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}
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}else
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s->maxval=1;
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if (!pnm_space(s->bytestream[-1]))
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return AVERROR_INVALIDDATA;
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/* more check if YUV420 */
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if (av_pix_fmt_desc_get(avctx->pix_fmt)->flags & AV_PIX_FMT_FLAG_PLANAR) {
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if ((avctx->width & 1) != 0)
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return AVERROR_INVALIDDATA;
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h = (avctx->height * 2);
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if ((h % 3) != 0)
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return AVERROR_INVALIDDATA;
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h /= 3;
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avctx->height = h;
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}
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return 0;
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}
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