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/* |
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* PNM image parser |
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* Copyright (c) 2002, 2003 Fabrice Bellard |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "libavutil/avassert.h" |
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#include "libavutil/imgutils.h" |
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#include "parser.h" //for ParseContext |
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#include "pnm.h" |
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typedef struct PNMParseContext { |
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ParseContext pc; |
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int remaining_bytes; |
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int ascii_scan; |
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}PNMParseContext; |
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static int pnm_parse(AVCodecParserContext *s, AVCodecContext *avctx, |
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const uint8_t **poutbuf, int *poutbuf_size, |
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const uint8_t *buf, int buf_size) |
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{ |
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PNMParseContext *pnmpc = s->priv_data; |
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ParseContext *pc = &pnmpc->pc; |
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PNMContext pnmctx; |
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int next = END_NOT_FOUND; |
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int skip = 0; |
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✗✓ |
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if (pc->overread > 0) { |
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memmove(pc->buffer + pc->index, pc->buffer + pc->overread_index, pc->overread); |
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pc->index += pc->overread; |
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pc->overread_index += pc->overread; |
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pc->overread = 0; |
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} |
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✓✓ |
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if (pnmpc->remaining_bytes) { |
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int inc = FFMIN(pnmpc->remaining_bytes, buf_size); |
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skip += inc; |
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pnmpc->remaining_bytes -= inc; |
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✓✓ |
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if (!pnmpc->remaining_bytes) |
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next = skip; |
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goto end; |
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} |
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retry: |
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✗✓ |
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if (pc->index) { |
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pnmctx.bytestream_start = |
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pnmctx.bytestream = pc->buffer; |
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pnmctx.bytestream_end = pc->buffer + pc->index; |
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} else { |
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pnmctx.bytestream_start = |
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pnmctx.bytestream = (uint8_t *) buf + skip; /* casts avoid warnings */ |
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pnmctx.bytestream_end = (uint8_t *) buf + buf_size - skip; |
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} |
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✓✓ |
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if (ff_pnm_decode_header(avctx, &pnmctx) < 0) { |
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✗✓ |
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if (pnmctx.bytestream < pnmctx.bytestream_end) { |
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if (pc->index) { |
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pc->index = 0; |
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pnmpc->ascii_scan = 0; |
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} else { |
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unsigned step = FFMAX(1, pnmctx.bytestream - pnmctx.bytestream_start); |
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skip += step; |
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} |
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goto retry; |
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} |
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✗✓ |
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} else if (pnmctx.type < 4) { |
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uint8_t *bs = pnmctx.bytestream; |
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const uint8_t *end = pnmctx.bytestream_end; |
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uint8_t *sync = bs; |
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if (pc->index) { |
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av_assert0(pnmpc->ascii_scan <= end - bs); |
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bs += pnmpc->ascii_scan; |
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} |
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while (bs < end) { |
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int c; |
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sync = bs; |
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c = *bs++; |
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if (c == '#') { |
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uint8_t *match = memchr(bs, '\n', end-bs); |
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if (match) |
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bs = match + 1; |
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else |
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break; |
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} else if (c == 'P') { |
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next = bs - pnmctx.bytestream_start + skip - 1; |
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pnmpc->ascii_scan = 0; |
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break; |
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} |
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} |
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if (next == END_NOT_FOUND) |
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pnmpc->ascii_scan = sync - pnmctx.bytestream + skip; |
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} else { |
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next = pnmctx.bytestream - pnmctx.bytestream_start + skip |
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+ av_image_get_buffer_size(avctx->pix_fmt, avctx->width, avctx->height, 1); |
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} |
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✓✓✗✓
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if (next != END_NOT_FOUND && pnmctx.bytestream_start != buf + skip) |
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next -= pc->index; |
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✓✓ |
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if (next > buf_size) { |
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pnmpc->remaining_bytes = next - buf_size; |
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next = END_NOT_FOUND; |
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} |
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end: |
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✓✓ |
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if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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return buf_size; |
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} |
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*poutbuf = buf; |
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*poutbuf_size = buf_size; |
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return next; |
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} |
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AVCodecParser ff_pnm_parser = { |
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.codec_ids = { AV_CODEC_ID_PGM, AV_CODEC_ID_PGMYUV, AV_CODEC_ID_PPM, |
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AV_CODEC_ID_PBM, AV_CODEC_ID_PAM }, |
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.priv_data_size = sizeof(PNMParseContext), |
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.parser_parse = pnm_parse, |
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.parser_close = ff_parse_close, |
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}; |