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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * PNM image parser |
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| 3 | * Copyright (c) 2002, 2003 Fabrice Bellard |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "parser.h" //for ParseContext |
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| 23 | #include "pnm.h" |
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| 24 | |||
| 25 | |||
| 26 | static int pnm_parse(AVCodecParserContext *s, AVCodecContext *avctx, |
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| 27 | const uint8_t **poutbuf, int *poutbuf_size, |
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| 28 | const uint8_t *buf, int buf_size) |
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| 29 | { |
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| 30 | ParseContext *pc = s->priv_data; |
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| 31 | PNMContext pnmctx; |
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| 32 | int next; |
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| 33 | |||
| 34 | for (; pc->overread > 0; pc->overread--) { |
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| 35 | pc->buffer[pc->index++]= pc->buffer[pc->overread_index++]; |
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| 36 | } |
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| 37 | retry: |
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| 38 | if (pc->index) { |
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| 39 | pnmctx.bytestream_start = |
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| 40 | pnmctx.bytestream = pc->buffer; |
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| 41 | pnmctx.bytestream_end = pc->buffer + pc->index; |
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| 42 | } else { |
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| 43 | pnmctx.bytestream_start = |
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| 44 | pnmctx.bytestream = (uint8_t *) buf; /* casts avoid warnings */ |
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| 45 | pnmctx.bytestream_end = (uint8_t *) buf + buf_size; |
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| 46 | } |
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| 47 | if (ff_pnm_decode_header(avctx, &pnmctx) < 0) { |
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| 48 | if (pnmctx.bytestream < pnmctx.bytestream_end) { |
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| 49 | if (pc->index) { |
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| 50 | pc->index = 0; |
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| 51 | } else { |
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| 52 | buf++; |
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| 53 | buf_size--; |
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| 54 | } |
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| 55 | goto retry; |
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| 56 | } |
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| 57 | #if 0 |
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| 58 | if (pc->index && pc->index * 2 + FF_INPUT_BUFFER_PADDING_SIZE < pc->buffer_size && buf_size > pc->index) { |
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| 59 | memcpy(pc->buffer + pc->index, buf, pc->index); |
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| 60 | pc->index += pc->index; |
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| 61 | buf += pc->index; |
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| 62 | buf_size -= pc->index; |
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| 63 | goto retry; |
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| 64 | } |
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| 65 | #endif |
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| 66 | next = END_NOT_FOUND; |
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| 67 | } else { |
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| 68 | next = pnmctx.bytestream - pnmctx.bytestream_start |
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| 69 | + avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height); |
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| 70 | if (pnmctx.bytestream_start != buf) |
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| 71 | next -= pc->index; |
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| 72 | if (next > buf_size) |
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| 73 | next = END_NOT_FOUND; |
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| 74 | } |
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| 75 | |||
| 76 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
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| 77 | *poutbuf = NULL; |
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| 78 | *poutbuf_size = 0; |
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| 79 | return buf_size; |
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| 80 | } |
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| 81 | *poutbuf = buf; |
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| 82 | *poutbuf_size = buf_size; |
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| 83 | return next; |
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| 84 | } |
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| 85 | |||
| 86 | AVCodecParser ff_pnm_parser = { |
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| 87 | .codec_ids = { AV_CODEC_ID_PGM, AV_CODEC_ID_PGMYUV, AV_CODEC_ID_PPM, |
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| 88 | AV_CODEC_ID_PBM, AV_CODEC_ID_PAM }, |
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| 89 | .priv_data_size = sizeof(ParseContext), |
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| 90 | .parser_parse = pnm_parse, |
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| 91 | .parser_close = ff_parse_close, |
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| 92 | }; |