mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2025-12-16 03:50:05 +01:00
added still image support
Originally committed as revision 1439 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard
285
libavformat/pnm.c
Normal file
285
libavformat/pnm.c
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@@ -0,0 +1,285 @@
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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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.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(ByteIOContext *f, 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 = url_fgetc(f);
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if (c == '#') {
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do {
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c = url_fgetc(f);
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} while (c != '\n' && c != URL_EOF);
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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 (c != URL_EOF && !pnm_space(c)) {
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if ((s - str) < buf_size - 1)
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*s++ = c;
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c = url_fgetc(f);
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}
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*s = '\0';
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}
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static int pnm_read1(ByteIOContext *f,
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int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque,
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int allow_yuv)
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{
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int i, n, linesize, h;
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char buf1[32];
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unsigned char *ptr;
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AVImageInfo info1, *info = &info1;
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int ret;
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pnm_get(f, buf1, sizeof(buf1));
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if (!strcmp(buf1, "P4")) {
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info->pix_fmt = PIX_FMT_MONOWHITE;
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} else if (!strcmp(buf1, "P5")) {
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if (allow_yuv)
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info->pix_fmt = PIX_FMT_YUV420P;
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else
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info->pix_fmt = PIX_FMT_GRAY8;
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} else if (!strcmp(buf1, "P6")) {
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info->pix_fmt = PIX_FMT_RGB24;
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} else {
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return AVERROR_INVALIDDATA;
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}
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pnm_get(f, buf1, sizeof(buf1));
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info->width = atoi(buf1);
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if (info->width <= 0)
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return AVERROR_INVALIDDATA;
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pnm_get(f, buf1, sizeof(buf1));
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info->height = atoi(buf1);
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if (info->height <= 0)
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return AVERROR_INVALIDDATA;
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if (info->pix_fmt != PIX_FMT_MONOWHITE) {
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pnm_get(f, buf1, sizeof(buf1));
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}
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/* more check if YUV420 */
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if (info->pix_fmt == PIX_FMT_YUV420P) {
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if ((info->width & 1) != 0)
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return AVERROR_INVALIDDATA;
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h = (info->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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info->height = h;
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}
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ret = alloc_cb(opaque, info);
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if (ret)
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return ret;
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switch(info->pix_fmt) {
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default:
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return AVERROR_INVALIDDATA;
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case PIX_FMT_RGB24:
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n = info->width * 3;
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goto do_read;
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case PIX_FMT_GRAY8:
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n = info->width;
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goto do_read;
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case PIX_FMT_MONOWHITE:
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n = (info->width + 7) >> 3;
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do_read:
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ptr = info->pict.data[0];
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linesize = info->pict.linesize[0];
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for(i = 0; i < info->height; i++) {
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get_buffer(f, ptr, n);
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ptr += linesize;
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}
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break;
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case PIX_FMT_YUV420P:
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{
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unsigned char *ptr1, *ptr2;
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n = info->width;
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ptr = info->pict.data[0];
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linesize = info->pict.linesize[0];
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for(i = 0; i < info->height; i++) {
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get_buffer(f, ptr, n);
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ptr += linesize;
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}
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ptr1 = info->pict.data[1];
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ptr2 = info->pict.data[2];
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n >>= 1;
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h = info->height >> 1;
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for(i = 0; i < h; i++) {
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get_buffer(f, ptr1, n);
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get_buffer(f, ptr2, n);
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ptr1 += info->pict.linesize[1];
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ptr2 += info->pict.linesize[2];
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}
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}
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break;
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}
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return 0;
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}
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static int pnm_read(ByteIOContext *f,
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int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
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{
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return pnm_read1(f, alloc_cb, opaque, 0);
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}
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static int pgmyuv_read(ByteIOContext *f,
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int (*alloc_cb)(void *opaque, AVImageInfo *info), void *opaque)
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{
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return pnm_read1(f, alloc_cb, opaque, 1);
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}
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static int pnm_write(ByteIOContext *pb, AVImageInfo *info)
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{
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int i, h, h1, c, n, linesize;
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char buf[100];
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UINT8 *ptr, *ptr1, *ptr2;
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h = info->height;
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h1 = h;
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switch(info->pix_fmt) {
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case PIX_FMT_MONOWHITE:
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c = '4';
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n = (info->width + 7) >> 3;
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break;
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case PIX_FMT_GRAY8:
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c = '5';
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n = info->width;
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break;
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case PIX_FMT_RGB24:
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c = '6';
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n = info->width * 3;
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break;
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case PIX_FMT_YUV420P:
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c = '5';
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n = info->width;
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h1 = (h * 3) / 2;
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break;
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default:
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return AVERROR_INVALIDDATA;
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}
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snprintf(buf, sizeof(buf),
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"P%c\n%d %d\n",
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c, info->width, h1);
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put_buffer(pb, buf, strlen(buf));
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if (info->pix_fmt != PIX_FMT_MONOWHITE) {
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snprintf(buf, sizeof(buf),
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"%d\n", 255);
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put_buffer(pb, buf, strlen(buf));
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}
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ptr = info->pict.data[0];
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linesize = info->pict.linesize[0];
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for(i=0;i<h;i++) {
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put_buffer(pb, ptr, n);
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ptr += linesize;
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}
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if (info->pix_fmt == PIX_FMT_YUV420P) {
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h >>= 1;
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n >>= 1;
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ptr1 = info->pict.data[1];
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ptr2 = info->pict.data[2];
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for(i=0;i<h;i++) {
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put_buffer(pb, ptr1, n);
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put_buffer(pb, ptr2, n);
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ptr1 += info->pict.linesize[1];
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ptr2 += info->pict.linesize[2];
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}
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}
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put_flush_packet(pb);
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return 0;
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}
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static int pnm_probe(AVProbeData *pd)
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{
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const char *p = pd->buf;
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if (pd->buf_size >= 8 &&
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p[0] == 'P' &&
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p[1] >= '4' && p[1] <= '6' &&
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p[2] == '\n')
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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static int pgmyuv_probe(AVProbeData *pd)
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{
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if (match_ext(pd->filename, "pgmyuv"))
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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AVImageFormat pnm_image_format = {
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"pnm",
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NULL,
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pnm_probe,
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pnm_read,
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0,
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NULL,
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};
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AVImageFormat pbm_image_format = {
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"pbm",
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"pbm",
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NULL,
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NULL,
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(1 << PIX_FMT_MONOWHITE),
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pnm_write,
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};
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AVImageFormat pgm_image_format = {
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"pgm",
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"pgm",
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NULL,
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NULL,
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(1 << PIX_FMT_GRAY8),
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pnm_write,
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};
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AVImageFormat ppm_image_format = {
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"ppm",
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"ppm",
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NULL,
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NULL,
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(1 << PIX_FMT_RGB24),
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pnm_write,
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};
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AVImageFormat pgmyuv_image_format = {
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"pgmyuv",
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NULL,
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pgmyuv_probe,
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pgmyuv_read,
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(1 << PIX_FMT_YUV420P),
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pnm_write,
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};
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