diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index cc4938b0a3..0ddf881a4f 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -118,13 +118,13 @@ OBJS-$(CONFIG_MSRLE_DECODER)           += msrle.o
 OBJS-$(CONFIG_MSVIDEO1_DECODER)        += msvideo1.o
 OBJS-$(CONFIG_MSZH_DECODER)            += lcl.o
 OBJS-$(CONFIG_NUV_DECODER)             += nuv.o rtjpeg.o
-OBJS-$(CONFIG_PAM_ENCODER)             += pnm.o pnm_common.o
-OBJS-$(CONFIG_PBM_ENCODER)             += pnm.o pnm_common.o
-OBJS-$(CONFIG_PGM_ENCODER)             += pnm.o pnm_common.o
-OBJS-$(CONFIG_PGMYUV_ENCODER)          += pnm.o pnm_common.o
+OBJS-$(CONFIG_PAM_ENCODER)             += pnmenc.o pnm.o
+OBJS-$(CONFIG_PBM_ENCODER)             += pnmenc.o pnm.o
+OBJS-$(CONFIG_PGM_ENCODER)             += pnmenc.o pnm.o
+OBJS-$(CONFIG_PGMYUV_ENCODER)          += pnmenc.o pnm.o
 OBJS-$(CONFIG_PNG_DECODER)             += png.o
 OBJS-$(CONFIG_PNG_ENCODER)             += png.o
-OBJS-$(CONFIG_PPM_ENCODER)             += pnm.o pnm_common.o
+OBJS-$(CONFIG_PPM_ENCODER)             += pnmenc.o pnm.o
 OBJS-$(CONFIG_PTX_DECODER)             += ptx.o
 OBJS-$(CONFIG_QDM2_DECODER)            += qdm2.o
 OBJS-$(CONFIG_QDRAW_DECODER)           += qdrw.o
@@ -299,7 +299,7 @@ OBJS-$(CONFIG_MJPEG_PARSER)            += mjpeg_parser.o
 OBJS-$(CONFIG_MPEG4VIDEO_PARSER)       += mpeg4video_parser.o
 OBJS-$(CONFIG_MPEGAUDIO_PARSER)        += mpegaudio_parser.o
 OBJS-$(CONFIG_MPEGVIDEO_PARSER)        += mpegvideo_parser.o
-OBJS-$(CONFIG_PNM_PARSER)              += pnm_parser.o pnm_common.o
+OBJS-$(CONFIG_PNM_PARSER)              += pnm_parser.o pnm.o
 OBJS-$(CONFIG_VC1_PARSER)              += vc1_parser.o
 
 OBJS-$(HAVE_PTHREADS)                  += pthread.o
diff --git a/libavcodec/pnm.c b/libavcodec/pnm.c
index 46f7e6e98a..1f28aced69 100644
--- a/libavcodec/pnm.c
+++ b/libavcodec/pnm.c
@@ -21,406 +21,127 @@
 #include "avcodec.h"
 #include "pnm.h"
 
+static inline int pnm_space(int c)
+{
+    return (c == ' ' || c == '\n' || c == '\r' || c == '\t');
+}
 
-static int common_init(AVCodecContext *avctx){
-    PNMContext *s = avctx->priv_data;
+static void pnm_get(PNMContext *sc, char *str, int buf_size)
+{
+    char *s;
+    int c;
 
-    avcodec_get_frame_defaults((AVFrame*)&s->picture);
-    avctx->coded_frame= (AVFrame*)&s->picture;
+    /* 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;
 }
-
-static int pnm_decode_frame(AVCodecContext *avctx,
-                        void *data, int *data_size,
-                        uint8_t *buf, int buf_size)
-{
-    PNMContext * const s = avctx->priv_data;
-    AVFrame *picture = data;
-    AVFrame * const p= (AVFrame*)&s->picture;
-    int i, n, linesize, h, upgrade = 0;
-    unsigned char *ptr;
-
-    s->bytestream_start=
-    s->bytestream= buf;
-    s->bytestream_end= buf + buf_size;
-
-    if(ff_pnm_decode_header(avctx, s) < 0)
-        return -1;
-
-    if(p->data[0])
-        avctx->release_buffer(avctx, p);
-
-    p->reference= 0;
-    if(avctx->get_buffer(avctx, p) < 0){
-        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return -1;
-    }
-    p->pict_type= FF_I_TYPE;
-    p->key_frame= 1;
-
-    switch(avctx->pix_fmt) {
-    default:
-        return -1;
-    case PIX_FMT_RGB24:
-        n = avctx->width * 3;
-        goto do_read;
-    case PIX_FMT_GRAY8:
-        n = avctx->width;
-        if (s->maxval < 255)
-            upgrade = 1;
-        goto do_read;
-    case PIX_FMT_GRAY16BE:
-    case PIX_FMT_GRAY16LE:
-        n = avctx->width * 2;
-        if (s->maxval < 65535)
-            upgrade = 2;
-        goto do_read;
-    case PIX_FMT_MONOWHITE:
-    case PIX_FMT_MONOBLACK:
-        n = (avctx->width + 7) >> 3;
-    do_read:
-        ptr = p->data[0];
-        linesize = p->linesize[0];
-        if(s->bytestream + n*avctx->height > s->bytestream_end)
-            return -1;
-        for(i = 0; i < avctx->height; i++) {
-            if (!upgrade)
-                memcpy(ptr, s->bytestream, n);
-            else if (upgrade == 1) {
-                unsigned int j, f = (255*128 + s->maxval/2) / s->maxval;
-                for (j=0; j<n; j++)
-                    ptr[j] = (s->bytestream[j] * f + 64) >> 7;
-            } else if (upgrade == 2) {
-                unsigned int j, v, f = (65535*32768 + s->maxval/2) / s->maxval;
-                for (j=0; j<n/2; j++) {
-                    v = be2me_16(((uint16_t *)s->bytestream)[j]);
-                    ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
-                }
-            }
-            s->bytestream += n;
-            ptr += linesize;
-        }
-        break;
-    case PIX_FMT_YUV420P:
-        {
-            unsigned char *ptr1, *ptr2;
-
-            n = avctx->width;
-            ptr = p->data[0];
-            linesize = p->linesize[0];
-            if(s->bytestream + n*avctx->height*3/2 > s->bytestream_end)
-                return -1;
-            for(i = 0; i < avctx->height; i++) {
-                memcpy(ptr, s->bytestream, n);
-                s->bytestream += n;
-                ptr += linesize;
-            }
-            ptr1 = p->data[1];
-            ptr2 = p->data[2];
-            n >>= 1;
-            h = avctx->height >> 1;
-            for(i = 0; i < h; i++) {
-                memcpy(ptr1, s->bytestream, n);
-                s->bytestream += n;
-                memcpy(ptr2, s->bytestream, n);
-                s->bytestream += n;
-                ptr1 += p->linesize[1];
-                ptr2 += p->linesize[2];
-            }
-        }
-        break;
-    case PIX_FMT_RGB32:
-        ptr = p->data[0];
-        linesize = p->linesize[0];
-        if(s->bytestream + avctx->width*avctx->height*4 > s->bytestream_end)
-            return -1;
-        for(i = 0; i < avctx->height; i++) {
-            int j, r, g, b, a;
-
-            for(j = 0;j < avctx->width; j++) {
-                r = *s->bytestream++;
-                g = *s->bytestream++;
-                b = *s->bytestream++;
-                a = *s->bytestream++;
-                ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
-            }
-            ptr += linesize;
-        }
-        break;
-    }
-    *picture= *(AVFrame*)&s->picture;
-    *data_size = sizeof(AVPicture);
-
-    return s->bytestream - s->bytestream_start;
-}
-
-static int pnm_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
-    PNMContext *s = avctx->priv_data;
-    AVFrame *pict = data;
-    AVFrame * const p= (AVFrame*)&s->picture;
-    int i, h, h1, c, n, linesize;
-    uint8_t *ptr, *ptr1, *ptr2;
-
-    if(buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200){
-        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
-        return -1;
-    }
-
-    *p = *pict;
-    p->pict_type= FF_I_TYPE;
-    p->key_frame= 1;
-
-    s->bytestream_start=
-    s->bytestream= outbuf;
-    s->bytestream_end= outbuf+buf_size;
-
-    h = avctx->height;
-    h1 = h;
-    switch(avctx->pix_fmt) {
-    case PIX_FMT_MONOWHITE:
-        c = '4';
-        n = (avctx->width + 7) >> 3;
-        break;
-    case PIX_FMT_GRAY8:
-        c = '5';
-        n = avctx->width;
-        break;
-    case PIX_FMT_GRAY16BE:
-        c = '5';
-        n = avctx->width * 2;
-        break;
-    case PIX_FMT_RGB24:
-        c = '6';
-        n = avctx->width * 3;
-        break;
-    case PIX_FMT_YUV420P:
-        c = '5';
-        n = avctx->width;
-        h1 = (h * 3) / 2;
-        break;
-    default:
-        return -1;
-    }
-    snprintf(s->bytestream, s->bytestream_end - s->bytestream,
-             "P%c\n%d %d\n",
-             c, avctx->width, h1);
-    s->bytestream += strlen(s->bytestream);
-    if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
-        snprintf(s->bytestream, s->bytestream_end - s->bytestream,
-                 "%d\n", (avctx->pix_fmt != PIX_FMT_GRAY16BE) ? 255 : 65535);
-        s->bytestream += strlen(s->bytestream);
-    }
-
-    ptr = p->data[0];
-    linesize = p->linesize[0];
-    for(i=0;i<h;i++) {
-        memcpy(s->bytestream, ptr, n);
-        s->bytestream += n;
-        ptr += linesize;
-    }
-
-    if (avctx->pix_fmt == PIX_FMT_YUV420P) {
-        h >>= 1;
-        n >>= 1;
-        ptr1 = p->data[1];
-        ptr2 = p->data[2];
-        for(i=0;i<h;i++) {
-            memcpy(s->bytestream, ptr1, n);
-            s->bytestream += n;
-            memcpy(s->bytestream, ptr2, n);
-            s->bytestream += n;
-                ptr1 += p->linesize[1];
-                ptr2 += p->linesize[2];
-        }
-    }
-    return s->bytestream - s->bytestream_start;
-}
-
-static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
-    PNMContext *s = avctx->priv_data;
-    AVFrame *pict = data;
-    AVFrame * const p= (AVFrame*)&s->picture;
-    int i, h, w, n, linesize, depth, maxval;
-    const char *tuple_type;
-    uint8_t *ptr;
-
-    if(buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200){
-        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
-        return -1;
-    }
-
-    *p = *pict;
-    p->pict_type= FF_I_TYPE;
-    p->key_frame= 1;
-
-    s->bytestream_start=
-    s->bytestream= outbuf;
-    s->bytestream_end= outbuf+buf_size;
-
-    h = avctx->height;
-    w = avctx->width;
-    switch(avctx->pix_fmt) {
-    case PIX_FMT_MONOWHITE:
-        n = (w + 7) >> 3;
-        depth = 1;
-        maxval = 1;
-        tuple_type = "BLACKANDWHITE";
-        break;
-    case PIX_FMT_GRAY8:
-        n = w;
-        depth = 1;
-        maxval = 255;
-        tuple_type = "GRAYSCALE";
-        break;
-    case PIX_FMT_RGB24:
-        n = w * 3;
-        depth = 3;
-        maxval = 255;
-        tuple_type = "RGB";
-        break;
-    case PIX_FMT_RGB32:
-        n = w * 4;
-        depth = 4;
-        maxval = 255;
-        tuple_type = "RGB_ALPHA";
-        break;
-    default:
-        return -1;
-    }
-    snprintf(s->bytestream, s->bytestream_end - s->bytestream,
-             "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLETYPE %s\nENDHDR\n",
-             w, h, depth, maxval, tuple_type);
-    s->bytestream += strlen(s->bytestream);
-
-    ptr = p->data[0];
-    linesize = p->linesize[0];
-
-    if (avctx->pix_fmt == PIX_FMT_RGB32) {
-        int j;
-        unsigned int v;
-
-        for(i=0;i<h;i++) {
-            for(j=0;j<w;j++) {
-                v = ((uint32_t *)ptr)[j];
-                *s->bytestream++ = v >> 16;
-                *s->bytestream++ = v >> 8;
-                *s->bytestream++ = v;
-                *s->bytestream++ = v >> 24;
-            }
-            ptr += linesize;
-        }
-    } else {
-        for(i=0;i<h;i++) {
-            memcpy(s->bytestream, ptr, n);
-            s->bytestream += n;
-            ptr += linesize;
-        }
-    }
-    return s->bytestream - s->bytestream_start;
-}
-
-#if 0
-static int pnm_probe(AVProbeData *pd)
-{
-    const char *p = pd->buf;
-    if (pd->buf_size >= 8 &&
-        p[0] == 'P' &&
-        p[1] >= '4' && p[1] <= '6' &&
-        pnm_space(p[2]) )
-        return AVPROBE_SCORE_MAX - 1; /* to permit pgmyuv probe */
-    else
-        return 0;
-}
-
-static int pgmyuv_probe(AVProbeData *pd)
-{
-    if (match_ext(pd->filename, "pgmyuv"))
-        return AVPROBE_SCORE_MAX;
-    else
-        return 0;
-}
-
-static int pam_probe(AVProbeData *pd)
-{
-    const char *p = pd->buf;
-    if (pd->buf_size >= 8 &&
-        p[0] == 'P' &&
-        p[1] == '7' &&
-        p[2] == '\n')
-        return AVPROBE_SCORE_MAX;
-    else
-        return 0;
-}
-#endif
-
-
-#ifdef CONFIG_PGM_ENCODER
-AVCodec pgm_encoder = {
-    "pgm",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_PGM,
-    sizeof(PNMContext),
-    common_init,
-    pnm_encode_frame,
-    NULL, //encode_end,
-    pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, -1},
-};
-#endif // CONFIG_PGM_ENCODER
-
-#ifdef CONFIG_PGMYUV_ENCODER
-AVCodec pgmyuv_encoder = {
-    "pgmyuv",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_PGMYUV,
-    sizeof(PNMContext),
-    common_init,
-    pnm_encode_frame,
-    NULL, //encode_end,
-    pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
-};
-#endif // CONFIG_PGMYUV_ENCODER
-
-#ifdef CONFIG_PPM_ENCODER
-AVCodec ppm_encoder = {
-    "ppm",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_PPM,
-    sizeof(PNMContext),
-    common_init,
-    pnm_encode_frame,
-    NULL, //encode_end,
-    pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, -1},
-};
-#endif // CONFIG_PPM_ENCODER
-
-#ifdef CONFIG_PBM_ENCODER
-AVCodec pbm_encoder = {
-    "pbm",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_PBM,
-    sizeof(PNMContext),
-    common_init,
-    pnm_encode_frame,
-    NULL, //encode_end,
-    pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_MONOWHITE, -1},
-};
-#endif // CONFIG_PBM_ENCODER
-
-#ifdef CONFIG_PAM_ENCODER
-AVCodec pam_encoder = {
-    "pam",
-    CODEC_TYPE_VIDEO,
-    CODEC_ID_PAM,
-    sizeof(PNMContext),
-    common_init,
-    pam_encode_frame,
-    NULL, //encode_end,
-    pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, -1},
-};
-#endif // CONFIG_PAM_ENCODER
diff --git a/libavcodec/pnm_common.c b/libavcodec/pnm_common.c
deleted file mode 100644
index 1f28aced69..0000000000
--- a/libavcodec/pnm_common.c
+++ /dev/null
@@ -1,147 +0,0 @@
-/*
- * 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;
-}
diff --git a/libavcodec/pnmenc.c b/libavcodec/pnmenc.c
new file mode 100644
index 0000000000..46f7e6e98a
--- /dev/null
+++ b/libavcodec/pnmenc.c
@@ -0,0 +1,426 @@
+/*
+ * 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 int common_init(AVCodecContext *avctx){
+    PNMContext *s = avctx->priv_data;
+
+    avcodec_get_frame_defaults((AVFrame*)&s->picture);
+    avctx->coded_frame= (AVFrame*)&s->picture;
+
+    return 0;
+}
+
+static int pnm_decode_frame(AVCodecContext *avctx,
+                        void *data, int *data_size,
+                        uint8_t *buf, int buf_size)
+{
+    PNMContext * const s = avctx->priv_data;
+    AVFrame *picture = data;
+    AVFrame * const p= (AVFrame*)&s->picture;
+    int i, n, linesize, h, upgrade = 0;
+    unsigned char *ptr;
+
+    s->bytestream_start=
+    s->bytestream= buf;
+    s->bytestream_end= buf + buf_size;
+
+    if(ff_pnm_decode_header(avctx, s) < 0)
+        return -1;
+
+    if(p->data[0])
+        avctx->release_buffer(avctx, p);
+
+    p->reference= 0;
+    if(avctx->get_buffer(avctx, p) < 0){
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+    p->pict_type= FF_I_TYPE;
+    p->key_frame= 1;
+
+    switch(avctx->pix_fmt) {
+    default:
+        return -1;
+    case PIX_FMT_RGB24:
+        n = avctx->width * 3;
+        goto do_read;
+    case PIX_FMT_GRAY8:
+        n = avctx->width;
+        if (s->maxval < 255)
+            upgrade = 1;
+        goto do_read;
+    case PIX_FMT_GRAY16BE:
+    case PIX_FMT_GRAY16LE:
+        n = avctx->width * 2;
+        if (s->maxval < 65535)
+            upgrade = 2;
+        goto do_read;
+    case PIX_FMT_MONOWHITE:
+    case PIX_FMT_MONOBLACK:
+        n = (avctx->width + 7) >> 3;
+    do_read:
+        ptr = p->data[0];
+        linesize = p->linesize[0];
+        if(s->bytestream + n*avctx->height > s->bytestream_end)
+            return -1;
+        for(i = 0; i < avctx->height; i++) {
+            if (!upgrade)
+                memcpy(ptr, s->bytestream, n);
+            else if (upgrade == 1) {
+                unsigned int j, f = (255*128 + s->maxval/2) / s->maxval;
+                for (j=0; j<n; j++)
+                    ptr[j] = (s->bytestream[j] * f + 64) >> 7;
+            } else if (upgrade == 2) {
+                unsigned int j, v, f = (65535*32768 + s->maxval/2) / s->maxval;
+                for (j=0; j<n/2; j++) {
+                    v = be2me_16(((uint16_t *)s->bytestream)[j]);
+                    ((uint16_t *)ptr)[j] = (v * f + 16384) >> 15;
+                }
+            }
+            s->bytestream += n;
+            ptr += linesize;
+        }
+        break;
+    case PIX_FMT_YUV420P:
+        {
+            unsigned char *ptr1, *ptr2;
+
+            n = avctx->width;
+            ptr = p->data[0];
+            linesize = p->linesize[0];
+            if(s->bytestream + n*avctx->height*3/2 > s->bytestream_end)
+                return -1;
+            for(i = 0; i < avctx->height; i++) {
+                memcpy(ptr, s->bytestream, n);
+                s->bytestream += n;
+                ptr += linesize;
+            }
+            ptr1 = p->data[1];
+            ptr2 = p->data[2];
+            n >>= 1;
+            h = avctx->height >> 1;
+            for(i = 0; i < h; i++) {
+                memcpy(ptr1, s->bytestream, n);
+                s->bytestream += n;
+                memcpy(ptr2, s->bytestream, n);
+                s->bytestream += n;
+                ptr1 += p->linesize[1];
+                ptr2 += p->linesize[2];
+            }
+        }
+        break;
+    case PIX_FMT_RGB32:
+        ptr = p->data[0];
+        linesize = p->linesize[0];
+        if(s->bytestream + avctx->width*avctx->height*4 > s->bytestream_end)
+            return -1;
+        for(i = 0; i < avctx->height; i++) {
+            int j, r, g, b, a;
+
+            for(j = 0;j < avctx->width; j++) {
+                r = *s->bytestream++;
+                g = *s->bytestream++;
+                b = *s->bytestream++;
+                a = *s->bytestream++;
+                ((uint32_t *)ptr)[j] = (a << 24) | (r << 16) | (g << 8) | b;
+            }
+            ptr += linesize;
+        }
+        break;
+    }
+    *picture= *(AVFrame*)&s->picture;
+    *data_size = sizeof(AVPicture);
+
+    return s->bytestream - s->bytestream_start;
+}
+
+static int pnm_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
+    PNMContext *s = avctx->priv_data;
+    AVFrame *pict = data;
+    AVFrame * const p= (AVFrame*)&s->picture;
+    int i, h, h1, c, n, linesize;
+    uint8_t *ptr, *ptr1, *ptr2;
+
+    if(buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200){
+        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
+        return -1;
+    }
+
+    *p = *pict;
+    p->pict_type= FF_I_TYPE;
+    p->key_frame= 1;
+
+    s->bytestream_start=
+    s->bytestream= outbuf;
+    s->bytestream_end= outbuf+buf_size;
+
+    h = avctx->height;
+    h1 = h;
+    switch(avctx->pix_fmt) {
+    case PIX_FMT_MONOWHITE:
+        c = '4';
+        n = (avctx->width + 7) >> 3;
+        break;
+    case PIX_FMT_GRAY8:
+        c = '5';
+        n = avctx->width;
+        break;
+    case PIX_FMT_GRAY16BE:
+        c = '5';
+        n = avctx->width * 2;
+        break;
+    case PIX_FMT_RGB24:
+        c = '6';
+        n = avctx->width * 3;
+        break;
+    case PIX_FMT_YUV420P:
+        c = '5';
+        n = avctx->width;
+        h1 = (h * 3) / 2;
+        break;
+    default:
+        return -1;
+    }
+    snprintf(s->bytestream, s->bytestream_end - s->bytestream,
+             "P%c\n%d %d\n",
+             c, avctx->width, h1);
+    s->bytestream += strlen(s->bytestream);
+    if (avctx->pix_fmt != PIX_FMT_MONOWHITE) {
+        snprintf(s->bytestream, s->bytestream_end - s->bytestream,
+                 "%d\n", (avctx->pix_fmt != PIX_FMT_GRAY16BE) ? 255 : 65535);
+        s->bytestream += strlen(s->bytestream);
+    }
+
+    ptr = p->data[0];
+    linesize = p->linesize[0];
+    for(i=0;i<h;i++) {
+        memcpy(s->bytestream, ptr, n);
+        s->bytestream += n;
+        ptr += linesize;
+    }
+
+    if (avctx->pix_fmt == PIX_FMT_YUV420P) {
+        h >>= 1;
+        n >>= 1;
+        ptr1 = p->data[1];
+        ptr2 = p->data[2];
+        for(i=0;i<h;i++) {
+            memcpy(s->bytestream, ptr1, n);
+            s->bytestream += n;
+            memcpy(s->bytestream, ptr2, n);
+            s->bytestream += n;
+                ptr1 += p->linesize[1];
+                ptr2 += p->linesize[2];
+        }
+    }
+    return s->bytestream - s->bytestream_start;
+}
+
+static int pam_encode_frame(AVCodecContext *avctx, unsigned char *outbuf, int buf_size, void *data){
+    PNMContext *s = avctx->priv_data;
+    AVFrame *pict = data;
+    AVFrame * const p= (AVFrame*)&s->picture;
+    int i, h, w, n, linesize, depth, maxval;
+    const char *tuple_type;
+    uint8_t *ptr;
+
+    if(buf_size < avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height) + 200){
+        av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n");
+        return -1;
+    }
+
+    *p = *pict;
+    p->pict_type= FF_I_TYPE;
+    p->key_frame= 1;
+
+    s->bytestream_start=
+    s->bytestream= outbuf;
+    s->bytestream_end= outbuf+buf_size;
+
+    h = avctx->height;
+    w = avctx->width;
+    switch(avctx->pix_fmt) {
+    case PIX_FMT_MONOWHITE:
+        n = (w + 7) >> 3;
+        depth = 1;
+        maxval = 1;
+        tuple_type = "BLACKANDWHITE";
+        break;
+    case PIX_FMT_GRAY8:
+        n = w;
+        depth = 1;
+        maxval = 255;
+        tuple_type = "GRAYSCALE";
+        break;
+    case PIX_FMT_RGB24:
+        n = w * 3;
+        depth = 3;
+        maxval = 255;
+        tuple_type = "RGB";
+        break;
+    case PIX_FMT_RGB32:
+        n = w * 4;
+        depth = 4;
+        maxval = 255;
+        tuple_type = "RGB_ALPHA";
+        break;
+    default:
+        return -1;
+    }
+    snprintf(s->bytestream, s->bytestream_end - s->bytestream,
+             "P7\nWIDTH %d\nHEIGHT %d\nDEPTH %d\nMAXVAL %d\nTUPLETYPE %s\nENDHDR\n",
+             w, h, depth, maxval, tuple_type);
+    s->bytestream += strlen(s->bytestream);
+
+    ptr = p->data[0];
+    linesize = p->linesize[0];
+
+    if (avctx->pix_fmt == PIX_FMT_RGB32) {
+        int j;
+        unsigned int v;
+
+        for(i=0;i<h;i++) {
+            for(j=0;j<w;j++) {
+                v = ((uint32_t *)ptr)[j];
+                *s->bytestream++ = v >> 16;
+                *s->bytestream++ = v >> 8;
+                *s->bytestream++ = v;
+                *s->bytestream++ = v >> 24;
+            }
+            ptr += linesize;
+        }
+    } else {
+        for(i=0;i<h;i++) {
+            memcpy(s->bytestream, ptr, n);
+            s->bytestream += n;
+            ptr += linesize;
+        }
+    }
+    return s->bytestream - s->bytestream_start;
+}
+
+#if 0
+static int pnm_probe(AVProbeData *pd)
+{
+    const char *p = pd->buf;
+    if (pd->buf_size >= 8 &&
+        p[0] == 'P' &&
+        p[1] >= '4' && p[1] <= '6' &&
+        pnm_space(p[2]) )
+        return AVPROBE_SCORE_MAX - 1; /* to permit pgmyuv probe */
+    else
+        return 0;
+}
+
+static int pgmyuv_probe(AVProbeData *pd)
+{
+    if (match_ext(pd->filename, "pgmyuv"))
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+
+static int pam_probe(AVProbeData *pd)
+{
+    const char *p = pd->buf;
+    if (pd->buf_size >= 8 &&
+        p[0] == 'P' &&
+        p[1] == '7' &&
+        p[2] == '\n')
+        return AVPROBE_SCORE_MAX;
+    else
+        return 0;
+}
+#endif
+
+
+#ifdef CONFIG_PGM_ENCODER
+AVCodec pgm_encoder = {
+    "pgm",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PGM,
+    sizeof(PNMContext),
+    common_init,
+    pnm_encode_frame,
+    NULL, //encode_end,
+    pnm_decode_frame,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, -1},
+};
+#endif // CONFIG_PGM_ENCODER
+
+#ifdef CONFIG_PGMYUV_ENCODER
+AVCodec pgmyuv_encoder = {
+    "pgmyuv",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PGMYUV,
+    sizeof(PNMContext),
+    common_init,
+    pnm_encode_frame,
+    NULL, //encode_end,
+    pnm_decode_frame,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+};
+#endif // CONFIG_PGMYUV_ENCODER
+
+#ifdef CONFIG_PPM_ENCODER
+AVCodec ppm_encoder = {
+    "ppm",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PPM,
+    sizeof(PNMContext),
+    common_init,
+    pnm_encode_frame,
+    NULL, //encode_end,
+    pnm_decode_frame,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, -1},
+};
+#endif // CONFIG_PPM_ENCODER
+
+#ifdef CONFIG_PBM_ENCODER
+AVCodec pbm_encoder = {
+    "pbm",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PBM,
+    sizeof(PNMContext),
+    common_init,
+    pnm_encode_frame,
+    NULL, //encode_end,
+    pnm_decode_frame,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_MONOWHITE, -1},
+};
+#endif // CONFIG_PBM_ENCODER
+
+#ifdef CONFIG_PAM_ENCODER
+AVCodec pam_encoder = {
+    "pam",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_PAM,
+    sizeof(PNMContext),
+    common_init,
+    pam_encode_frame,
+    NULL, //encode_end,
+    pnm_decode_frame,
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, -1},
+};
+#endif // CONFIG_PAM_ENCODER