move pnm parser in its own file

Originally committed as revision 8988 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 147 insertions, 0 deletions

diff --git a/libavcodec/pnm_common.c b/libavcodec/pnm_common.c
new file mode 100644
index 0000000000..1f28aced69
--- /dev/null
+++ b/libavcodec/pnm_common.c
@@ -0,0 +1,147 @@
+/*
+ * 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 "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));
+    if (!strcmp(buf1, "P4")) {
+        avctx->pix_fmt = PIX_FMT_MONOWHITE;
+    } else if (!strcmp(buf1, "P5")) {
+        if (avctx->codec_id == CODEC_ID_PGMYUV)
+            avctx->pix_fmt = PIX_FMT_YUV420P;
+        else
+            avctx->pix_fmt = PIX_FMT_GRAY8;
+    } else if (!strcmp(buf1, "P6")) {
+        avctx->pix_fmt = PIX_FMT_RGB24;
+    } else if (!strcmp(buf1, "P7")) {
+        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, "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' || avcodec_check_dimensions(avctx, w, h))
+            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) {
+            avctx->pix_fmt = PIX_FMT_RGB24;
+        } 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(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
+        return -1;
+    if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
+        pnm_get(s, buf1, sizeof(buf1));
+        s->maxval = atoi(buf1);
+        if(s->maxval >= 256 && avctx->pix_fmt == PIX_FMT_GRAY8) {
+            avctx->pix_fmt = PIX_FMT_GRAY16BE;
+            if (s->maxval != 65535)
+                avctx->pix_fmt = PIX_FMT_GRAY16;
+        }
+    }
+    /* 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;
+}