adding ffmpeg specific version

1 files changed, 92 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/pnm_parser.c b/ffmpeg1/libavcodec/pnm_parser.c
new file mode 100644
index 0000000..2a9e3e1
--- /dev/null
+++ b/ffmpeg1/libavcodec/pnm_parser.c
@@ -0,0 +1,92 @@
+/*
+ * 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 ff_pnm_parser = {
+    .codec_ids      = { AV_CODEC_ID_PGM, AV_CODEC_ID_PGMYUV, AV_CODEC_ID_PPM,
+                        AV_CODEC_ID_PBM, AV_CODEC_ID_PAM },
+    .priv_data_size = sizeof(ParseContext),
+    .parser_parse   = pnm_parse,
+    .parser_close   = ff_parse_close,
+};