Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / pnm_parser.c
CommitLineData
2ba45a60
DM
1/*
2 * PNM image parser
3 * Copyright (c) 2002, 2003 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22#include "parser.h" //for ParseContext
23#include "pnm.h"
24
25
26static int pnm_parse(AVCodecParserContext *s, AVCodecContext *avctx,
27 const uint8_t **poutbuf, int *poutbuf_size,
28 const uint8_t *buf, int buf_size)
29{
30 ParseContext *pc = s->priv_data;
31 PNMContext pnmctx;
32 int next;
33
34 for (; pc->overread > 0; pc->overread--) {
35 pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
36 }
37retry:
38 if (pc->index) {
39 pnmctx.bytestream_start =
40 pnmctx.bytestream = pc->buffer;
41 pnmctx.bytestream_end = pc->buffer + pc->index;
42 } else {
43 pnmctx.bytestream_start =
44 pnmctx.bytestream = (uint8_t *) buf; /* casts avoid warnings */
45 pnmctx.bytestream_end = (uint8_t *) buf + buf_size;
46 }
47 if (ff_pnm_decode_header(avctx, &pnmctx) < 0) {
48 if (pnmctx.bytestream < pnmctx.bytestream_end) {
49 if (pc->index) {
50 pc->index = 0;
51 } else {
52 buf++;
53 buf_size--;
54 }
55 goto retry;
56 }
57#if 0
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;
61 buf += pc->index;
62 buf_size -= pc->index;
63 goto retry;
64 }
65#endif
66 next = END_NOT_FOUND;
67 } else {
68 next = pnmctx.bytestream - pnmctx.bytestream_start
69 + avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
70 if (pnmctx.bytestream_start != buf)
71 next -= pc->index;
72 if (next > buf_size)
73 next = END_NOT_FOUND;
74 }
75
76 if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
77 *poutbuf = NULL;
78 *poutbuf_size = 0;
79 return buf_size;
80 }
81 *poutbuf = buf;
82 *poutbuf_size = buf_size;
83 return next;
84}
85
86AVCodecParser 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,
92};