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![Michael Niedermayer](/assets/img/avatar_default.png)
Implements issue1452. Originally committed as revision 20687 to svn://svn.ffmpeg.org/ffmpeg/trunk
190 lines
5.6 KiB
C
190 lines
5.6 KiB
C
/*
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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 "avcodec.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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/* skip spaces and comments */
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for (;;) {
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c = *sc->bytestream++;
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if (c == '#') {
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do {
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c = *sc->bytestream++;
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} while (c != '\n' && sc->bytestream < sc->bytestream_end);
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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 (sc->bytestream < sc->bytestream_end && !pnm_space(c)) {
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if ((s - str) < buf_size - 1)
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*s++ = c;
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c = *sc->bytestream++;
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}
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*s = '\0';
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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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pnm_get(s, buf1, sizeof(buf1));
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s->type= buf1[1]-'0';
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if(buf1[0] != 'P')
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return -1;
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if (s->type==1 || s->type==4) {
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avctx->pix_fmt = PIX_FMT_MONOWHITE;
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} else if (s->type==2 || s->type==5) {
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if (avctx->codec_id == CODEC_ID_PGMYUV)
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avctx->pix_fmt = PIX_FMT_YUV420P;
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else
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avctx->pix_fmt = PIX_FMT_GRAY8;
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} else if (s->type==3 || s->type==6) {
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avctx->pix_fmt = 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, "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 -1;
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}
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}
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/* check that all tags are present */
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if (w <= 0 || h <= 0 || maxval <= 0 || depth <= 0 || tuple_type[0] == '\0' || avcodec_check_dimensions(avctx, w, h))
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return -1;
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avctx->width = w;
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avctx->height = h;
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if (depth == 1) {
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if (maxval == 1)
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avctx->pix_fmt = PIX_FMT_MONOWHITE;
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else
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avctx->pix_fmt = PIX_FMT_GRAY8;
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} else if (depth == 3) {
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if (maxval < 256) {
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avctx->pix_fmt = PIX_FMT_RGB24;
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} else {
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av_log(avctx, AV_LOG_ERROR, "16-bit components are only supported for grayscale\n");
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avctx->pix_fmt = PIX_FMT_NONE;
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return -1;
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}
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} else if (depth == 4) {
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avctx->pix_fmt = PIX_FMT_RGB32;
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} else {
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return -1;
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}
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return 0;
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} else {
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return -1;
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}
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pnm_get(s, buf1, sizeof(buf1));
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avctx->width = atoi(buf1);
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if (avctx->width <= 0)
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return -1;
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pnm_get(s, buf1, sizeof(buf1));
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avctx->height = atoi(buf1);
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if(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
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return -1;
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if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
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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 >= 256) {
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if (avctx->pix_fmt == PIX_FMT_GRAY8) {
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avctx->pix_fmt = PIX_FMT_GRAY16BE;
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if (s->maxval != 65535)
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avctx->pix_fmt = PIX_FMT_GRAY16;
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} else if (avctx->pix_fmt == PIX_FMT_RGB24) {
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if (s->maxval > 255)
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avctx->pix_fmt = PIX_FMT_RGB48BE;
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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 = PIX_FMT_NONE;
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return -1;
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}
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}
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}else
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s->maxval=1;
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/* more check if YUV420 */
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if (avctx->pix_fmt == PIX_FMT_YUV420P) {
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if ((avctx->width & 1) != 0)
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return -1;
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h = (avctx->height * 2);
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if ((h % 3) != 0)
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return -1;
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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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av_cold int ff_pnm_end(AVCodecContext *avctx)
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{
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PNMContext *s = avctx->priv_data;
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if (s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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return 0;
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}
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av_cold int ff_pnm_init(AVCodecContext *avctx)
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{
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PNMContext *s = avctx->priv_data;
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avcodec_get_frame_defaults((AVFrame*)&s->picture);
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avctx->coded_frame = (AVFrame*)&s->picture;
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return 0;
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}
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