eadd495d06
av_probe_input_buffer() so that it can be reused. Here are a few
differences to the original way things were probed:
- maximum probe buffer size can be specified as a parameter.
- offset within the stream to probe from can be specified as a parameter.
- instead of seeking back to the start each time a probe fails, stream
data is appended to the reallocated buffer. This lowers the amount
of data read from the stream (there is no repetition) and results in
fewer closed and reopened streams (when seeking fails).
New attempt after r22296, which was revert in r22315 due to a FATE
failure.
See the thread:
Subject: [FFmpeg-devel] [PATCH] Move av_open_input_file probe loop to its own method
Date: 2010-03-05 03:23:57 GMT
Patch by Micah F. Galizia printf("%s%s@%s.%s", "micah", "galizia", "gmail", "com").
Originally committed as revision 22532 to svn://svn.ffmpeg.org/ffmpeg/trunk
63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
/*
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* copyright (c) 2001 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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#ifndef AVFORMAT_INTERNAL_H
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#define AVFORMAT_INTERNAL_H
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#include <stdint.h>
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#include "avformat.h"
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char *ff_data_to_hex(char *buf, const uint8_t *src, int size);
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void av_program_add_stream_index(AVFormatContext *ac, int progid, unsigned int idx);
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/**
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* Add packet to AVFormatContext->packet_buffer list, determining its
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* interleaved position using compare() function argument.
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*/
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void ff_interleave_add_packet(AVFormatContext *s, AVPacket *pkt,
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int (*compare)(AVFormatContext *, AVPacket *, AVPacket *));
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void av_read_frame_flush(AVFormatContext *s);
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/** Gets the current time since NTP epoch in microseconds. */
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uint64_t ff_ntp_time(void);
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/**
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* Probes a bytestream to determine the input format. Each time a probe returns
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* with a score that is too low, the probe buffer size is increased and another
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* attempt is made. When the maximum probe size is reached, the input format
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* with the highest score is returned.
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*
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* @param pb the bytestream to probe, it may be closed and opened again
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* @param fmt the input format is put here
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* @param filename the filename of the stream
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* @param logctx the log context
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* @param offset the offset within the bytestream to probe from
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* @param max_probe_size the maximum probe buffer size (zero for default)
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* @return 0 in case of success, a negative value corresponding to an
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* AVERROR code otherwise
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*/
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int ff_probe_input_buffer(ByteIOContext **pb, AVInputFormat **fmt,
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const char *filename, void *logctx,
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unsigned int offset, unsigned int max_probe_size);
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#endif /* AVFORMAT_INTERNAL_H */
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