LCOV - code coverage report
Current view: top level - src/libavformat - avio_internal.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 3 100.0 %
Date: 2017-09-22 00:04:37 Functions: 1 1 100.0 %

          Line data    Source code
       1             : /*
       2             :  * This file is part of FFmpeg.
       3             :  *
       4             :  * FFmpeg is free software; you can redistribute it and/or
       5             :  * modify it under the terms of the GNU Lesser General Public
       6             :  * License as published by the Free Software Foundation; either
       7             :  * version 2.1 of the License, or (at your option) any later version.
       8             :  *
       9             :  * FFmpeg is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             :  * Lesser General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU Lesser General Public
      15             :  * License along with FFmpeg; if not, write to the Free Software
      16             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      17             :  */
      18             : 
      19             : #ifndef AVFORMAT_AVIO_INTERNAL_H
      20             : #define AVFORMAT_AVIO_INTERNAL_H
      21             : 
      22             : #include "avio.h"
      23             : #include "url.h"
      24             : 
      25             : #include "libavutil/log.h"
      26             : 
      27             : extern const AVClass ff_avio_class;
      28             : 
      29             : int ffio_init_context(AVIOContext *s,
      30             :                   unsigned char *buffer,
      31             :                   int buffer_size,
      32             :                   int write_flag,
      33             :                   void *opaque,
      34             :                   int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
      35             :                   int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
      36             :                   int64_t (*seek)(void *opaque, int64_t offset, int whence));
      37             : 
      38             : 
      39             : /**
      40             :  * Read size bytes from AVIOContext, returning a pointer.
      41             :  * Note that the data pointed at by the returned pointer is only
      42             :  * valid until the next call that references the same IO context.
      43             :  * @param s IO context
      44             :  * @param buf pointer to buffer into which to assemble the requested
      45             :  *    data if it is not available in contiguous addresses in the
      46             :  *    underlying buffer
      47             :  * @param size number of bytes requested
      48             :  * @param data address at which to store pointer: this will be a
      49             :  *    a direct pointer into the underlying buffer if the requested
      50             :  *    number of bytes are available at contiguous addresses, otherwise
      51             :  *    will be a copy of buf
      52             :  * @return number of bytes read or AVERROR
      53             :  */
      54             : int ffio_read_indirect(AVIOContext *s, unsigned char *buf, int size, const unsigned char **data);
      55             : 
      56             : void ffio_fill(AVIOContext *s, int b, int count);
      57             : 
      58       29445 : static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
      59             : {
      60       29445 :     avio_wl32(pb, MKTAG(s[0], s[1], s[2], s[3]));
      61       29445 : }
      62             : 
      63             : /**
      64             :  * Rewind the AVIOContext using the specified buffer containing the first buf_size bytes of the file.
      65             :  * Used after probing to avoid seeking.
      66             :  * Joins buf and s->buffer, taking any overlap into consideration.
      67             :  * @note s->buffer must overlap with buf or they can't be joined and the function fails
      68             :  *
      69             :  * @param s The read-only AVIOContext to rewind
      70             :  * @param buf The probe buffer containing the first buf_size bytes of the file
      71             :  * @param buf_size The size of buf
      72             :  * @return >= 0 in case of success, a negative value corresponding to an
      73             :  * AVERROR code in case of failure
      74             :  */
      75             : int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **buf, int buf_size);
      76             : 
      77             : uint64_t ffio_read_varlen(AVIOContext *bc);
      78             : 
      79             : /**
      80             :  * Read size bytes from AVIOContext into buf.
      81             :  * Check that exactly size bytes have been read.
      82             :  * @return number of bytes read or AVERROR
      83             :  */
      84             : int ffio_read_size(AVIOContext *s, unsigned char *buf, int size);
      85             : 
      86             : /** @warning must be called before any I/O */
      87             : int ffio_set_buf_size(AVIOContext *s, int buf_size);
      88             : 
      89             : /**
      90             :  * Ensures that the requested seekback buffer size will be available
      91             :  *
      92             :  * Will ensure that when reading sequentially up to buf_size, seeking
      93             :  * within the current pos and pos+buf_size is possible.
      94             :  * Once the stream position moves outside this window this guarantee is lost.
      95             :  */
      96             : int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size);
      97             : 
      98             : int ffio_limit(AVIOContext *s, int size);
      99             : 
     100             : void ffio_init_checksum(AVIOContext *s,
     101             :                         unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
     102             :                         unsigned long checksum);
     103             : unsigned long ffio_get_checksum(AVIOContext *s);
     104             : unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
     105             :                                     unsigned int len);
     106             : unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
     107             :                                     unsigned int len);
     108             : unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
     109             :                                 unsigned int len);
     110             : 
     111             : /**
     112             :  * Open a write only packetized memory stream with a maximum packet
     113             :  * size of 'max_packet_size'.  The stream is stored in a memory buffer
     114             :  * with a big-endian 4 byte header giving the packet size in bytes.
     115             :  *
     116             :  * @param s new IO context
     117             :  * @param max_packet_size maximum packet size (must be > 0)
     118             :  * @return zero if no error.
     119             :  */
     120             : int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
     121             : 
     122             : /**
     123             :  * Create and initialize a AVIOContext for accessing the
     124             :  * resource referenced by the URLContext h.
     125             :  * @note When the URLContext h has been opened in read+write mode, the
     126             :  * AVIOContext can be used only for writing.
     127             :  *
     128             :  * @param s Used to return the pointer to the created AVIOContext.
     129             :  * In case of failure the pointed to value is set to NULL.
     130             :  * @return >= 0 in case of success, a negative value corresponding to an
     131             :  * AVERROR code in case of failure
     132             :  */
     133             : int ffio_fdopen(AVIOContext **s, URLContext *h);
     134             : 
     135             : /**
     136             :  * Open a write-only fake memory stream. The written data is not stored
     137             :  * anywhere - this is only used for measuring the amount of data
     138             :  * written.
     139             :  *
     140             :  * @param s new IO context
     141             :  * @return zero if no error.
     142             :  */
     143             : int ffio_open_null_buf(AVIOContext **s);
     144             : 
     145             : int ffio_open_whitelist(AVIOContext **s, const char *url, int flags,
     146             :                          const AVIOInterruptCB *int_cb, AVDictionary **options,
     147             :                          const char *whitelist, const char *blacklist);
     148             : 
     149             : /**
     150             :  * Close a null buffer.
     151             :  *
     152             :  * @param s an IO context opened by ffio_open_null_buf
     153             :  * @return the number of bytes written to the null buffer
     154             :  */
     155             : int ffio_close_null_buf(AVIOContext *s);
     156             : 
     157             : /**
     158             :  * Free a dynamic buffer.
     159             :  *
     160             :  * @param s a pointer to an IO context opened by avio_open_dyn_buf()
     161             :  */
     162             : void ffio_free_dyn_buf(AVIOContext **s);
     163             : 
     164             : #endif /* AVFORMAT_AVIO_INTERNAL_H */

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