FFmpeg/libavcodec/pnm_parser.c
Michael Niedermayer 7a72695c05 Merge commit '36ef5369ee9b336febc2c270f8718cec4476cb85'
* commit '36ef5369ee9b336febc2c270f8718cec4476cb85':
  Replace all CODEC_ID_* with AV_CODEC_ID_*
  lavc: add AV prefix to codec ids.

Conflicts:
	doc/APIchanges
	doc/examples/decoding_encoding.c
	doc/examples/muxing.c
	ffmpeg.c
	ffprobe.c
	ffserver.c
	libavcodec/8svx.c
	libavcodec/avcodec.h
	libavcodec/dnxhd_parser.c
	libavcodec/dvdsubdec.c
	libavcodec/error_resilience.c
	libavcodec/h263dec.c
	libavcodec/libvorbisenc.c
	libavcodec/mjpeg_parser.c
	libavcodec/mjpegenc.c
	libavcodec/mpeg12.c
	libavcodec/mpeg4videodec.c
	libavcodec/mpegvideo.c
	libavcodec/mpegvideo_enc.c
	libavcodec/pcm.c
	libavcodec/r210dec.c
	libavcodec/utils.c
	libavcodec/v210dec.c
	libavcodec/version.h
	libavdevice/alsa-audio-dec.c
	libavdevice/bktr.c
	libavdevice/v4l2.c
	libavformat/asfdec.c
	libavformat/asfenc.c
	libavformat/avformat.h
	libavformat/avidec.c
	libavformat/caf.c
	libavformat/electronicarts.c
	libavformat/flacdec.c
	libavformat/flvdec.c
	libavformat/flvenc.c
	libavformat/framecrcenc.c
	libavformat/img2.c
	libavformat/img2dec.c
	libavformat/img2enc.c
	libavformat/ipmovie.c
	libavformat/isom.c
	libavformat/matroska.c
	libavformat/matroskadec.c
	libavformat/matroskaenc.c
	libavformat/mov.c
	libavformat/movenc.c
	libavformat/mp3dec.c
	libavformat/mpeg.c
	libavformat/mpegts.c
	libavformat/mxf.c
	libavformat/mxfdec.c
	libavformat/mxfenc.c
	libavformat/nsvdec.c
	libavformat/nut.c
	libavformat/oggenc.c
	libavformat/pmpdec.c
	libavformat/rawdec.c
	libavformat/rawenc.c
	libavformat/riff.c
	libavformat/sdp.c
	libavformat/utils.c
	libavformat/vocenc.c
	libavformat/wtv.c
	libavformat/xmv.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
2012-08-07 22:45:46 +02:00

93 lines
3.0 KiB
C

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