3 * Copyright (c) 2002, 2003 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "parser.h" //for ParseContext
26 static int pnm_parse(AVCodecParserContext
*s
, AVCodecContext
*avctx
,
27 const uint8_t **poutbuf
, int *poutbuf_size
,
28 const uint8_t *buf
, int buf_size
)
30 ParseContext
*pc
= s
->priv_data
;
34 for (; pc
->overread
> 0; pc
->overread
--) {
35 pc
->buffer
[pc
->index
++]= pc
->buffer
[pc
->overread_index
++];
39 pnmctx
.bytestream_start
=
40 pnmctx
.bytestream
= pc
->buffer
;
41 pnmctx
.bytestream_end
= pc
->buffer
+ pc
->index
;
43 pnmctx
.bytestream_start
=
44 pnmctx
.bytestream
= (uint8_t *) buf
; /* casts avoid warnings */
45 pnmctx
.bytestream_end
= (uint8_t *) buf
+ buf_size
;
47 if (ff_pnm_decode_header(avctx
, &pnmctx
) < 0) {
48 if (pnmctx
.bytestream
< pnmctx
.bytestream_end
) {
58 if (pc
->index
&& pc
->index
* 2 + FF_INPUT_BUFFER_PADDING_SIZE
< pc
->buffer_size
&& buf_size
> pc
->index
) {
59 memcpy(pc
->buffer
+ pc
->index
, buf
, pc
->index
);
60 pc
->index
+= pc
->index
;
62 buf_size
-= pc
->index
;
68 next
= pnmctx
.bytestream
- pnmctx
.bytestream_start
69 + avpicture_get_size(avctx
->pix_fmt
, avctx
->width
, avctx
->height
);
70 if (pnmctx
.bytestream_start
!= buf
)
76 if (ff_combine_frame(pc
, next
, &buf
, &buf_size
) < 0) {
82 *poutbuf_size
= buf_size
;
86 AVCodecParser ff_pnm_parser
= {
87 .codec_ids
= { AV_CODEC_ID_PGM
, AV_CODEC_ID_PGMYUV
, AV_CODEC_ID_PPM
,
88 AV_CODEC_ID_PBM
, AV_CODEC_ID_PAM
},
89 .priv_data_size
= sizeof(ParseContext
),
90 .parser_parse
= pnm_parse
,
91 .parser_close
= ff_parse_close
,