yading@10: /*
yading@10:  * PNM image parser
yading@10:  * Copyright (c) 2002, 2003 Fabrice Bellard
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "parser.h" //for ParseContext
yading@10: #include "pnm.h"
yading@10: 
yading@10: 
yading@10: static int pnm_parse(AVCodecParserContext *s, AVCodecContext *avctx,
yading@10:                      const uint8_t **poutbuf, int *poutbuf_size,
yading@10:                      const uint8_t *buf, int buf_size)
yading@10: {
yading@10:     ParseContext *pc = s->priv_data;
yading@10:     PNMContext pnmctx;
yading@10:     int next;
yading@10: 
yading@10:     for (; pc->overread > 0; pc->overread--) {
yading@10:         pc->buffer[pc->index++]= pc->buffer[pc->overread_index++];
yading@10:     }
yading@10: retry:
yading@10:     if (pc->index) {
yading@10:         pnmctx.bytestream_start =
yading@10:         pnmctx.bytestream       = pc->buffer;
yading@10:         pnmctx.bytestream_end   = pc->buffer + pc->index;
yading@10:     } else {
yading@10:         pnmctx.bytestream_start =
yading@10:         pnmctx.bytestream       = (uint8_t *) buf; /* casts avoid warnings */
yading@10:         pnmctx.bytestream_end   = (uint8_t *) buf + buf_size;
yading@10:     }
yading@10:     if (ff_pnm_decode_header(avctx, &pnmctx) < 0) {
yading@10:         if (pnmctx.bytestream < pnmctx.bytestream_end) {
yading@10:             if (pc->index) {
yading@10:                 pc->index = 0;
yading@10:             } else {
yading@10:                 buf++;
yading@10:                 buf_size--;
yading@10:             }
yading@10:             goto retry;
yading@10:         }
yading@10: #if 0
yading@10:         if (pc->index && pc->index * 2 + FF_INPUT_BUFFER_PADDING_SIZE < pc->buffer_size && buf_size > pc->index) {
yading@10:             memcpy(pc->buffer + pc->index, buf, pc->index);
yading@10:             pc->index += pc->index;
yading@10:             buf       += pc->index;
yading@10:             buf_size  -= pc->index;
yading@10:             goto retry;
yading@10:         }
yading@10: #endif
yading@10:         next = END_NOT_FOUND;
yading@10:     } else {
yading@10:         next = pnmctx.bytestream - pnmctx.bytestream_start
yading@10:                + avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
yading@10:         if (pnmctx.bytestream_start != buf)
yading@10:             next -= pc->index;
yading@10:         if (next > buf_size)
yading@10:             next = END_NOT_FOUND;
yading@10:     }
yading@10: 
yading@10:     if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
yading@10:         *poutbuf      = NULL;
yading@10:         *poutbuf_size = 0;
yading@10:         return buf_size;
yading@10:     }
yading@10:     *poutbuf      = buf;
yading@10:     *poutbuf_size = buf_size;
yading@10:     return next;
yading@10: }
yading@10: 
yading@10: AVCodecParser ff_pnm_parser = {
yading@10:     .codec_ids      = { AV_CODEC_ID_PGM, AV_CODEC_ID_PGMYUV, AV_CODEC_ID_PPM,
yading@10:                         AV_CODEC_ID_PBM, AV_CODEC_ID_PAM },
yading@10:     .priv_data_size = sizeof(ParseContext),
yading@10:     .parser_parse   = pnm_parse,
yading@10:     .parser_close   = ff_parse_close,
yading@10: };