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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 | ||
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) | |
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 | } | |
37 | retry: | |
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 | ||
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, | |
92 | }; |