move pnm parser in its own file

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

1 files changed, 93 insertions, 0 deletions

diff --git a/libavcodec/pnm_parser.c b/libavcodec/pnm_parser.c
new file mode 100644
index 0000000000..f5212f0244
--- /dev/null
+++ b/libavcodec/pnm_parser.c
@@ -0,0 +1,93 @@
+/*
+ * PNM image parser
+ * 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 "parser.h" //for ParseContext
+#include "pnm.h"
+
+
+static int pnm_parse(AVCodecParserContext *s,
+                           AVCodecContext *avctx,
+                           const uint8_t **poutbuf, int *poutbuf_size,
+                           const uint8_t *buf, int buf_size)
+{
+    ParseContext *pc = s->priv_data;
+    PNMContext pnmctx;
+    int next;
+
+    for(; pc->overread>0; pc->overread--){
+        pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
+    }
+retry:
+    if(pc->index){
+        pnmctx.bytestream_start=
+        pnmctx.bytestream= pc->buffer;
+        pnmctx.bytestream_end= pc->buffer + pc->index;
+    }else{
+        pnmctx.bytestream_start=
+        pnmctx.bytestream= (uint8_t *) buf; /* casts avoid warnings */
+        pnmctx.bytestream_end= (uint8_t *) buf + buf_size;
+    }
+    if(ff_pnm_decode_header(avctx, &pnmctx) < 0){
+        if(pnmctx.bytestream < pnmctx.bytestream_end){
+            if(pc->index){
+                pc->index=0;
+            }else{
+                buf++;
+                buf_size--;
+            }
+            goto retry;
+        }
+#if 0
+        if(pc->index && pc->index*2 + FF_INPUT_BUFFER_PADDING_SIZE < pc->buffer_size && buf_size > pc->index){
+            memcpy(pc->buffer + pc->index, buf, pc->index);
+            pc->index += pc->index;
+            buf += pc->index;
+            buf_size -= pc->index;
+            goto retry;
+        }
+#endif
+        next= END_NOT_FOUND;
+    }else{
+        next= pnmctx.bytestream - pnmctx.bytestream_start
+            + avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
+        if(pnmctx.bytestream_start!=buf)
+            next-= pc->index;
+        if(next > buf_size)
+            next= END_NOT_FOUND;
+    }
+
+    if(ff_combine_frame(pc, next, &buf, &buf_size)<0){
+        *poutbuf = NULL;
+        *poutbuf_size = 0;
+        return buf_size;
+    }
+    *poutbuf = buf;
+    *poutbuf_size = buf_size;
+    return next;
+}
+
+AVCodecParser pnm_parser = {
+    { CODEC_ID_PGM, CODEC_ID_PGMYUV, CODEC_ID_PPM, CODEC_ID_PBM, CODEC_ID_PAM},
+    sizeof(ParseContext),
+    NULL,
+    pnm_parse,
+    ff_parse_close,
+};