PeerStreamer

/*

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#ifndef AVFORMAT_AVIO_INTERNAL_H

#define AVFORMAT_AVIO_INTERNAL_H

#include "avio.h"

#include "url.h"

int ffio_init_context(AVIOContext *s,

                  unsigned char *buffer,

                  int buffer_size,

                  int write_flag,

                  void *opaque,

                  int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),

                  int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),

                  int64_t (*seek)(void *opaque, int64_t offset, int whence));

/**

 * Read size bytes from AVIOContext into buf.

 * This reads at most 1 packet. If that is not enough fewer bytes will be

 * returned.

 * @return number of bytes read or AVERROR

 */

int ffio_read_partial(AVIOContext *s, unsigned char *buf, int size);

void ffio_fill(AVIOContext *s, int b, int count);

static av_always_inline void ffio_wfourcc(AVIOContext *pb, const uint8_t *s)

{

    avio_wl32(pb, MKTAG(s[0], s[1], s[2], s[3]));

}

/**

 * Rewind the AVIOContext using the specified buffer containing the first buf_size bytes of the file.

 * Used after probing to avoid seeking.

 * Joins buf and s->buffer, taking any overlap into consideration.

 * @note s->buffer must overlap with buf or they can't be joined and the function fails

 *

 * @param s The read-only AVIOContext to rewind

 * @param buf The probe buffer containing the first buf_size bytes of the file

 * @param buf_size The size of buf

 * @return 0 in case of success, a negative value corresponding to an

 * AVERROR code in case of failure

 */

int ffio_rewind_with_probe_data(AVIOContext *s, unsigned char *buf, int buf_size);

uint64_t ffio_read_varlen(AVIOContext *bc);

/** @warning must be called before any I/O */

int ffio_set_buf_size(AVIOContext *s, int buf_size);

void ffio_init_checksum(AVIOContext *s,

                        unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len),

                        unsigned long checksum);

unsigned long ffio_get_checksum(AVIOContext *s);

unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf,

                                    unsigned int len);

/**

 * Open a write only packetized memory stream with a maximum packet

 * size of 'max_packet_size'.  The stream is stored in a memory buffer

 * with a big endian 4 byte header giving the packet size in bytes.

 *

 * @param s new IO context

 * @param max_packet_size maximum packet size (must be > 0)

 * @return zero if no error.

 */

int ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);

/**

 * Create and initialize a AVIOContext for accessing the

 * resource referenced by the URLContext h.

 * @note When the URLContext h has been opened in read+write mode, the

 * AVIOContext can be used only for writing.

 *

 * @param s Used to return the pointer to the created AVIOContext.

 * In case of failure the pointed to value is set to NULL.

 * @return 0 in case of success, a negative value corresponding to an

 * AVERROR code in case of failure

 */

int ffio_fdopen(AVIOContext **s, URLContext *h);

#endif // AVFORMAT_AVIO_INTERNAL_H