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: 2017-01-28 02:43:52 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             : /**
      57             :  * Read size bytes from AVIOContext into buf.
      58             :  * This reads at most 1 packet. If that is not enough fewer bytes will be
      59             :  * returned.
      60             :  * @return number of bytes read or AVERROR
      61             :  */
      62             : int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size);
      63             : 
      64             : void ffio_fill(AVIOContext *s, int b, int count);
      65             : 
      66       28275 : static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)
      67             : {
      68       28275 :     avio_wl32(pb, MKTAG(s[0], s[1], s[2], s[3]));
      69       28275 : }
      70             : 
      71             : /**
      72             :  * Rewind the AVIOContext using the specified buffer containing the first buf_size bytes of the file.
      73             :  * Used after probing to avoid seeking.
      74             :  * Joins buf and s->buffer, taking any overlap into consideration.
      75             :  * @note s->buffer must overlap with buf or they can't be joined and the function fails
      76             :  *
      77             :  * @param s The read-only AVIOContext to rewind
      78             :  * @param buf The probe buffer containing the first buf_size bytes of the file
      79             :  * @param buf_size The size of buf
      80             :  * @return >= 0 in case of success, a negative value corresponding to an
      81             :  * AVERROR code in case of failure
      82             :  */
      83             : int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char **buf, int buf_size);
      84             : 
      85             : uint64_t ffio_read_varlen(AVIOContext *bc);
      86             : 
      87             : /**
      88             :  * Read size bytes from AVIOContext into buf.
      89             :  * Check that exactly size bytes have been read.
      90             :  * @return number of bytes read or AVERROR
      91             :  */
      92             : int ffio_read_size(AVIOContext *s, unsigned char *buf, int size);
      93             : 
      94             : /** @warning must be called before any I/O */
      95             : int ffio_set_buf_size(AVIOContext *s, int buf_size);
      96             : 
      97             : /**
      98             :  * Ensures that the requested seekback buffer size will be available
      99             :  *
     100             :  * Will ensure that when reading sequentially up to buf_size, seeking
     101             :  * within the current pos and pos+buf_size is possible.
     102             :  * Once the stream position moves outside this window this guarantee is lost.
     103             :  */
     104             : int ffio_ensure_seekback(AVIOContext *s, int64_t buf_size);
     105             : 
     106             : int ffio_limit(AVIOContext *s, int size);
     107             : 
     108             : void ffio_init_checksum(AVIOContext *s,
     109             :                         unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),
     110             :                         unsigned long checksum);
     111             : unsigned long ffio_get_checksum(AVIOContext *s);
     112             : unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,
     113             :                                     unsigned int len);
     114             : unsigned long ff_crcEDB88320_update(unsigned long checksum, const uint8_t *buf,
     115             :                                     unsigned int len);
     116             : unsigned long ff_crcA001_update(unsigned long checksum, const uint8_t *buf,
     117             :                                 unsigned int len);
     118             : 
     119             : /**
     120             :  * Open a write only packetized memory stream with a maximum packet
     121             :  * size of 'max_packet_size'.  The stream is stored in a memory buffer
     122             :  * with a big-endian 4 byte header giving the packet size in bytes.
     123             :  *
     124             :  * @param s new IO context
     125             :  * @param max_packet_size maximum packet size (must be > 0)
     126             :  * @return zero if no error.
     127             :  */
     128             : int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
     129             : 
     130             : /**
     131             :  * Create and initialize a AVIOContext for accessing the
     132             :  * resource referenced by the URLContext h.
     133             :  * @note When the URLContext h has been opened in read+write mode, the
     134             :  * AVIOContext can be used only for writing.
     135             :  *
     136             :  * @param s Used to return the pointer to the created AVIOContext.
     137             :  * In case of failure the pointed to value is set to NULL.
     138             :  * @return >= 0 in case of success, a negative value corresponding to an
     139             :  * AVERROR code in case of failure
     140             :  */
     141             : int ffio_fdopen(AVIOContext **s, URLContext *h);
     142             : 
     143             : /**
     144             :  * Open a write-only fake memory stream. The written data is not stored
     145             :  * anywhere - this is only used for measuring the amount of data
     146             :  * written.
     147             :  *
     148             :  * @param s new IO context
     149             :  * @return zero if no error.
     150             :  */
     151             : int ffio_open_null_buf(AVIOContext **s);
     152             : 
     153             : int ffio_open_whitelist(AVIOContext **s, const char *url, int flags,
     154             :                          const AVIOInterruptCB *int_cb, AVDictionary **options,
     155             :                          const char *whitelist, const char *blacklist);
     156             : 
     157             : /**
     158             :  * Close a null buffer.
     159             :  *
     160             :  * @param s an IO context opened by ffio_open_null_buf
     161             :  * @return the number of bytes written to the null buffer
     162             :  */
     163             : int ffio_close_null_buf(AVIOContext *s);
     164             : 
     165             : /**
     166             :  * Free a dynamic buffer.
     167             :  *
     168             :  * @param s a pointer to an IO context opened by avio_open_dyn_buf()
     169             :  */
     170             : void ffio_free_dyn_buf(AVIOContext **s);
     171             : 
     172             : #endif /* AVFORMAT_AVIO_INTERNAL_H */

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