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684 lines
24 KiB
684 lines
24 KiB
/* |
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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_AVIO_H |
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#define AVFORMAT_AVIO_H |
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/** |
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* @file |
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* unbuffered I/O operations |
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* |
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* @warning This file has to be considered an internal but installed |
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* header, so it should not be directly included in your projects. |
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*/ |
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#include <stdint.h> |
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#include "libavutil/common.h" |
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#include "libavutil/log.h" |
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#include "libavformat/version.h" |
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/* unbuffered I/O */ |
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/** |
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* URL Context. |
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* New fields can be added to the end with minor version bumps. |
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* Removal, reordering and changes to existing fields require a major |
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* version bump. |
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* sizeof(URLContext) must not be used outside libav*. |
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*/ |
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typedef struct URLContext { |
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#if FF_API_URL_CLASS |
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const AVClass *av_class; ///< information for av_log(). Set by url_open(). |
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#endif |
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struct URLProtocol *prot; |
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int flags; |
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int is_streamed; /**< true if streamed (no seek possible), default = false */ |
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int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */ |
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void *priv_data; |
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char *filename; /**< specified URL */ |
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int is_connected; |
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} URLContext; |
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typedef struct URLPollEntry { |
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URLContext *handle; |
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int events; |
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int revents; |
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} URLPollEntry; |
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/** |
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* @defgroup open_modes URL open modes |
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* The flags argument to url_open and cosins must be one of the following |
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* constants, optionally ORed with other flags. |
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* @{ |
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*/ |
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#define URL_RDONLY 0 /**< read-only */ |
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#define URL_WRONLY 1 /**< write-only */ |
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#define URL_RDWR 2 /**< read-write */ |
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/** |
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* @} |
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*/ |
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/** |
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* Use non-blocking mode. |
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* If this flag is set, operations on the context will return |
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* AVERROR(EAGAIN) if they can not be performed immediately. |
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* If this flag is not set, operations on the context will never return |
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* AVERROR(EAGAIN). |
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* Note that this flag does not affect the opening/connecting of the |
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* context. Connecting a protocol will always block if necessary (e.g. on |
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* network protocols) but never hang (e.g. on busy devices). |
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* Warning: non-blocking protocols is work-in-progress; this flag may be |
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* silently ignored. |
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*/ |
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#define URL_FLAG_NONBLOCK 4 |
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typedef int URLInterruptCB(void); |
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/** |
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* Create a URLContext for accessing to the resource indicated by |
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* url, and open it using the URLProtocol up. |
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* |
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* @param puc pointer to the location where, in case of success, the |
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* function puts the pointer to the created URLContext |
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* @param flags flags which control how the resource indicated by url |
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* is to be opened |
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* @return 0 in case of success, a negative value corresponding to an |
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* AVERROR code in case of failure |
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*/ |
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int url_open_protocol (URLContext **puc, struct URLProtocol *up, |
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const char *url, int flags); |
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/** |
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* Create a URLContext for accessing to the resource indicated by |
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* url, but do not initiate the connection yet. |
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* |
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* @param puc pointer to the location where, in case of success, the |
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* function puts the pointer to the created URLContext |
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* @param flags flags which control how the resource indicated by url |
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* is to be opened |
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* @return 0 in case of success, a negative value corresponding to an |
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* AVERROR code in case of failure |
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*/ |
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int url_alloc(URLContext **h, const char *url, int flags); |
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/** |
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* Connect an URLContext that has been allocated by url_alloc |
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*/ |
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int url_connect(URLContext *h); |
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/** |
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* Create an URLContext for accessing to the resource indicated by |
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* url, and open it. |
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* |
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* @param puc pointer to the location where, in case of success, the |
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* function puts the pointer to the created URLContext |
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* @param flags flags which control how the resource indicated by url |
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* is to be opened |
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* @return 0 in case of success, a negative value corresponding to an |
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* AVERROR code in case of failure |
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*/ |
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int url_open(URLContext **h, const char *url, int flags); |
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/** |
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* Read up to size bytes from the resource accessed by h, and store |
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* the read bytes in buf. |
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* |
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* @return The number of bytes actually read, or a negative value |
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* corresponding to an AVERROR code in case of error. A value of zero |
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* indicates that it is not possible to read more from the accessed |
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* resource (except if the value of the size argument is also zero). |
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*/ |
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int url_read(URLContext *h, unsigned char *buf, int size); |
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/** |
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* Read as many bytes as possible (up to size), calling the |
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* read function multiple times if necessary. |
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* This makes special short-read handling in applications |
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* unnecessary, if the return value is < size then it is |
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* certain there was either an error or the end of file was reached. |
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*/ |
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int url_read_complete(URLContext *h, unsigned char *buf, int size); |
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/** |
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* Write size bytes from buf to the resource accessed by h. |
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* |
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* @return the number of bytes actually written, or a negative value |
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* corresponding to an AVERROR code in case of failure |
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*/ |
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int url_write(URLContext *h, const unsigned char *buf, int size); |
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/** |
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* Passing this as the "whence" parameter to a seek function causes it to |
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* return the filesize without seeking anywhere. Supporting this is optional. |
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* If it is not supported then the seek function will return <0. |
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*/ |
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#define AVSEEK_SIZE 0x10000 |
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/** |
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* Change the position that will be used by the next read/write |
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* operation on the resource accessed by h. |
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* |
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* @param pos specifies the new position to set |
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* @param whence specifies how pos should be interpreted, it must be |
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* one of SEEK_SET (seek from the beginning), SEEK_CUR (seek from the |
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* current position), SEEK_END (seek from the end), or AVSEEK_SIZE |
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* (return the filesize of the requested resource, pos is ignored). |
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* @return a negative value corresponding to an AVERROR code in case |
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* of failure, or the resulting file position, measured in bytes from |
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* the beginning of the file. You can use this feature together with |
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* SEEK_CUR to read the current file position. |
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*/ |
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int64_t url_seek(URLContext *h, int64_t pos, int whence); |
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/** |
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* Close the resource accessed by the URLContext h, and free the |
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* memory used by it. |
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* |
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* @return a negative value if an error condition occurred, 0 |
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* otherwise |
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*/ |
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int url_close(URLContext *h); |
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/** |
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* Return a non-zero value if the resource indicated by url |
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* exists, 0 otherwise. |
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*/ |
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int url_exist(const char *url); |
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/** |
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* Return the filesize of the resource accessed by h, AVERROR(ENOSYS) |
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* if the operation is not supported by h, or another negative value |
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* corresponding to an AVERROR error code in case of failure. |
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*/ |
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int64_t url_filesize(URLContext *h); |
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/** |
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* Return the file descriptor associated with this URL. For RTP, this |
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* will return only the RTP file descriptor, not the RTCP file descriptor. |
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* |
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* @return the file descriptor associated with this URL, or <0 on error. |
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*/ |
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int url_get_file_handle(URLContext *h); |
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/** |
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* Return the maximum packet size associated to packetized file |
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* handle. If the file is not packetized (stream like HTTP or file on |
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* disk), then 0 is returned. |
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* |
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* @param h file handle |
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* @return maximum packet size in bytes |
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*/ |
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int url_get_max_packet_size(URLContext *h); |
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/** |
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* Copy the filename of the resource accessed by h to buf. |
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* |
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* @param buf_size size in bytes of buf |
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*/ |
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void url_get_filename(URLContext *h, char *buf, int buf_size); |
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/** |
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* The callback is called in blocking functions to test regulary if |
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* asynchronous interruption is needed. AVERROR_EXIT is returned |
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* in this case by the interrupted function. 'NULL' means no interrupt |
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* callback is given. |
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*/ |
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void url_set_interrupt_cb(URLInterruptCB *interrupt_cb); |
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/* not implemented */ |
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int url_poll(URLPollEntry *poll_table, int n, int timeout); |
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/** |
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* Pause and resume playing - only meaningful if using a network streaming |
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* protocol (e.g. MMS). |
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* @param pause 1 for pause, 0 for resume |
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*/ |
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int av_url_read_pause(URLContext *h, int pause); |
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/** |
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* Seek to a given timestamp relative to some component stream. |
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* Only meaningful if using a network streaming protocol (e.g. MMS.). |
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* @param stream_index The stream index that the timestamp is relative to. |
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* If stream_index is (-1) the timestamp should be in AV_TIME_BASE |
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* units from the beginning of the presentation. |
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* If a stream_index >= 0 is used and the protocol does not support |
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* seeking based on component streams, the call will fail with ENOTSUP. |
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* @param timestamp timestamp in AVStream.time_base units |
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* or if there is no stream specified then in AV_TIME_BASE units. |
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* @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE |
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* and AVSEEK_FLAG_ANY. The protocol may silently ignore |
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* AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will |
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* fail with ENOTSUP if used and not supported. |
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* @return >= 0 on success |
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* @see AVInputFormat::read_seek |
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*/ |
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int64_t av_url_read_seek(URLContext *h, int stream_index, |
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int64_t timestamp, int flags); |
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/** |
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* Oring this flag as into the "whence" parameter to a seek function causes it to |
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* seek by any means (like reopening and linear reading) or other normally unreasonble |
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* means that can be extreemly slow. |
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* This may be ignored by the seek code. |
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*/ |
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#define AVSEEK_FORCE 0x20000 |
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#define URL_PROTOCOL_FLAG_NESTED_SCHEME 1 /*< The protocol name can be the first part of a nested protocol scheme */ |
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typedef struct URLProtocol { |
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const char *name; |
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int (*url_open)(URLContext *h, const char *url, int flags); |
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int (*url_read)(URLContext *h, unsigned char *buf, int size); |
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int (*url_write)(URLContext *h, const unsigned char *buf, int size); |
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int64_t (*url_seek)(URLContext *h, int64_t pos, int whence); |
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int (*url_close)(URLContext *h); |
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struct URLProtocol *next; |
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int (*url_read_pause)(URLContext *h, int pause); |
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int64_t (*url_read_seek)(URLContext *h, int stream_index, |
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int64_t timestamp, int flags); |
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int (*url_get_file_handle)(URLContext *h); |
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int priv_data_size; |
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const AVClass *priv_data_class; |
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int flags; |
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} URLProtocol; |
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#if FF_API_REGISTER_PROTOCOL |
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extern URLProtocol *first_protocol; |
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#endif |
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extern URLInterruptCB *url_interrupt_cb; |
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/** |
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* If protocol is NULL, returns the first registered protocol, |
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* if protocol is non-NULL, returns the next registered protocol after protocol, |
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* or NULL if protocol is the last one. |
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*/ |
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URLProtocol *av_protocol_next(URLProtocol *p); |
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#if FF_API_REGISTER_PROTOCOL |
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/** |
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* @deprecated Use av_register_protocol() instead. |
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*/ |
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attribute_deprecated int register_protocol(URLProtocol *protocol); |
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/** |
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* @deprecated Use av_register_protocol2() instead. |
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*/ |
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attribute_deprecated int av_register_protocol(URLProtocol *protocol); |
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#endif |
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/** |
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* Register the URLProtocol protocol. |
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* |
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* @param size the size of the URLProtocol struct referenced |
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*/ |
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int av_register_protocol2(URLProtocol *protocol, int size); |
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/** |
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* Bytestream IO Context. |
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* New fields can be added to the end with minor version bumps. |
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* Removal, reordering and changes to existing fields require a major |
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* version bump. |
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* sizeof(AVIOContext) must not be used outside libav*. |
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*/ |
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typedef struct { |
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unsigned char *buffer; |
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int buffer_size; |
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unsigned char *buf_ptr, *buf_end; |
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void *opaque; |
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size); |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size); |
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int64_t (*seek)(void *opaque, int64_t offset, int whence); |
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int64_t pos; /**< position in the file of the current buffer */ |
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int must_flush; /**< true if the next seek should flush */ |
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int eof_reached; /**< true if eof reached */ |
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int write_flag; /**< true if open for writing */ |
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int is_streamed; |
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int max_packet_size; |
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unsigned long checksum; |
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unsigned char *checksum_ptr; |
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unsigned long (*update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size); |
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int error; ///< contains the error code or 0 if no error happened |
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int (*read_pause)(void *opaque, int pause); |
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int64_t (*read_seek)(void *opaque, int stream_index, |
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int64_t timestamp, int flags); |
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} AVIOContext; |
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#if FF_API_OLD_AVIO |
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typedef attribute_deprecated AVIOContext ByteIOContext; |
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attribute_deprecated int init_put_byte(AVIOContext *s, |
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unsigned char *buffer, |
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int buffer_size, |
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int write_flag, |
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void *opaque, |
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)); |
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attribute_deprecated AVIOContext *av_alloc_put_byte( |
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unsigned char *buffer, |
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int buffer_size, |
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int write_flag, |
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void *opaque, |
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)); |
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/** |
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* @defgroup old_avio_funcs Old put_/get_*() functions |
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* @deprecated use the avio_ -prefixed functions instead. |
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* @{ |
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*/ |
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attribute_deprecated int get_buffer(AVIOContext *s, unsigned char *buf, int size); |
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attribute_deprecated int get_partial_buffer(AVIOContext *s, unsigned char *buf, int size); |
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attribute_deprecated int get_byte(AVIOContext *s); |
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attribute_deprecated unsigned int get_le16(AVIOContext *s); |
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attribute_deprecated unsigned int get_le24(AVIOContext *s); |
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attribute_deprecated unsigned int get_le32(AVIOContext *s); |
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attribute_deprecated uint64_t get_le64(AVIOContext *s); |
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attribute_deprecated unsigned int get_be16(AVIOContext *s); |
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attribute_deprecated unsigned int get_be24(AVIOContext *s); |
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attribute_deprecated unsigned int get_be32(AVIOContext *s); |
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attribute_deprecated uint64_t get_be64(AVIOContext *s); |
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attribute_deprecated void put_byte(AVIOContext *s, int b); |
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attribute_deprecated void put_nbyte(AVIOContext *s, int b, int count); |
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attribute_deprecated void put_buffer(AVIOContext *s, const unsigned char *buf, int size); |
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attribute_deprecated void put_le64(AVIOContext *s, uint64_t val); |
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attribute_deprecated void put_be64(AVIOContext *s, uint64_t val); |
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attribute_deprecated void put_le32(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_be32(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_le24(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_be24(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_le16(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_be16(AVIOContext *s, unsigned int val); |
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attribute_deprecated void put_tag(AVIOContext *s, const char *tag); |
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/** |
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* @} |
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*/ |
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attribute_deprecated int av_url_read_fpause(AVIOContext *h, int pause); |
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attribute_deprecated int64_t av_url_read_fseek (AVIOContext *h, int stream_index, |
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int64_t timestamp, int flags); |
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/** |
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* @defgroup old_url_f_funcs Old url_f* functions |
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* @deprecated use the avio_ -prefixed functions instead. |
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* @{ |
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*/ |
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attribute_deprecated int url_fopen( AVIOContext **s, const char *url, int flags); |
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attribute_deprecated int url_fclose(AVIOContext *s); |
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attribute_deprecated int64_t url_fseek(AVIOContext *s, int64_t offset, int whence); |
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attribute_deprecated int url_fskip(AVIOContext *s, int64_t offset); |
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attribute_deprecated int64_t url_ftell(AVIOContext *s); |
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attribute_deprecated int64_t url_fsize(AVIOContext *s); |
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#define URL_EOF (-1) |
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attribute_deprecated int url_fgetc(AVIOContext *s); |
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attribute_deprecated int url_setbufsize(AVIOContext *s, int buf_size); |
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#ifdef __GNUC__ |
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attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3))); |
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#else |
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attribute_deprecated int url_fprintf(AVIOContext *s, const char *fmt, ...); |
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#endif |
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attribute_deprecated void put_flush_packet(AVIOContext *s); |
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/** |
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* @} |
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*/ |
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attribute_deprecated int url_ferror(AVIOContext *s); |
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attribute_deprecated int udp_set_remote_url(URLContext *h, const char *uri); |
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attribute_deprecated int udp_get_local_port(URLContext *h); |
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#endif |
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AVIOContext *avio_alloc_context( |
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unsigned char *buffer, |
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int buffer_size, |
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int write_flag, |
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void *opaque, |
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int (*read_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int (*write_packet)(void *opaque, uint8_t *buf, int buf_size), |
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int64_t (*seek)(void *opaque, int64_t offset, int whence)); |
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void avio_w8(AVIOContext *s, int b); |
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void avio_write(AVIOContext *s, const unsigned char *buf, int size); |
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void avio_wl64(AVIOContext *s, uint64_t val); |
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void avio_wb64(AVIOContext *s, uint64_t val); |
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void avio_wl32(AVIOContext *s, unsigned int val); |
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void avio_wb32(AVIOContext *s, unsigned int val); |
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void avio_wl24(AVIOContext *s, unsigned int val); |
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void avio_wb24(AVIOContext *s, unsigned int val); |
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void avio_wl16(AVIOContext *s, unsigned int val); |
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void avio_wb16(AVIOContext *s, unsigned int val); |
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#if FF_API_OLD_AVIO |
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attribute_deprecated void put_strz(AVIOContext *s, const char *buf); |
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#endif |
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/** |
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* Write a NULL-terminated string. |
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* @return number of bytes written. |
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*/ |
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int avio_put_str(AVIOContext *s, const char *str); |
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/** |
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* Convert an UTF-8 string to UTF-16LE and write it. |
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* @return number of bytes written. |
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*/ |
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int avio_put_str16le(AVIOContext *s, const char *str); |
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/** |
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* fseek() equivalent for AVIOContext. |
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* @return new position or AVERROR. |
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*/ |
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int64_t avio_seek(AVIOContext *s, int64_t offset, int whence); |
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/** |
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* Skip given number of bytes forward |
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* @return new position or AVERROR. |
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*/ |
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int64_t avio_skip(AVIOContext *s, int64_t offset); |
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/** |
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* ftell() equivalent for AVIOContext. |
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* @return position or AVERROR. |
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*/ |
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static av_always_inline int64_t avio_tell(AVIOContext *s) |
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{ |
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return avio_seek(s, 0, SEEK_CUR); |
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} |
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/** |
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* Get the filesize. |
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* @return filesize or AVERROR |
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*/ |
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int64_t avio_size(AVIOContext *s); |
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/** |
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* feof() equivalent for AVIOContext. |
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* @return non zero if and only if end of file |
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*/ |
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int url_feof(AVIOContext *s); |
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/** @warning currently size is limited */ |
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#ifdef __GNUC__ |
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int avio_printf(AVIOContext *s, const char *fmt, ...) __attribute__ ((__format__ (__printf__, 2, 3))); |
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#else |
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int avio_printf(AVIOContext *s, const char *fmt, ...); |
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#endif |
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#if FF_API_OLD_AVIO |
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/** @note unlike fgets, the EOL character is not returned and a whole |
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line is parsed. return NULL if first char read was EOF */ |
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attribute_deprecated char *url_fgets(AVIOContext *s, char *buf, int buf_size); |
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#endif |
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void avio_flush(AVIOContext *s); |
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/** |
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* Read size bytes from AVIOContext into buf. |
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* @return number of bytes read or AVERROR |
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*/ |
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int avio_read(AVIOContext *s, unsigned char *buf, int size); |
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/** @note return 0 if EOF, so you cannot use it if EOF handling is |
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necessary */ |
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int avio_r8 (AVIOContext *s); |
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unsigned int avio_rl16(AVIOContext *s); |
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unsigned int avio_rl24(AVIOContext *s); |
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unsigned int avio_rl32(AVIOContext *s); |
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uint64_t avio_rl64(AVIOContext *s); |
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/** |
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* Read a string from pb into buf. The reading will terminate when either |
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* a NULL character was encountered, maxlen bytes have been read, or nothing |
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* more can be read from pb. The result is guaranteed to be NULL-terminated, it |
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* will be truncated if buf is too small. |
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* Note that the string is not interpreted or validated in any way, it |
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* might get truncated in the middle of a sequence for multi-byte encodings. |
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* |
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* @return number of bytes read (is always <= maxlen). |
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* If reading ends on EOF or error, the return value will be one more than |
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* bytes actually read. |
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*/ |
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int avio_get_str(AVIOContext *pb, int maxlen, char *buf, int buflen); |
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/** |
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* Read a UTF-16 string from pb and convert it to UTF-8. |
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* The reading will terminate when either a null or invalid character was |
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* encountered or maxlen bytes have been read. |
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* @return number of bytes read (is always <= maxlen) |
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*/ |
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int avio_get_str16le(AVIOContext *pb, int maxlen, char *buf, int buflen); |
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int avio_get_str16be(AVIOContext *pb, int maxlen, char *buf, int buflen); |
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#if FF_API_OLD_AVIO |
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/** |
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* @deprecated use avio_get_str instead |
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*/ |
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attribute_deprecated char *get_strz(AVIOContext *s, char *buf, int maxlen); |
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#endif |
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unsigned int avio_rb16(AVIOContext *s); |
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unsigned int avio_rb24(AVIOContext *s); |
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unsigned int avio_rb32(AVIOContext *s); |
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uint64_t avio_rb64(AVIOContext *s); |
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static inline int url_is_streamed(AVIOContext *s) |
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{ |
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return s->is_streamed; |
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} |
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/** |
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* Create and initialize a AVIOContext for accessing the |
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* resource referenced by the URLContext h. |
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* @note When the URLContext h has been opened in read+write mode, the |
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* AVIOContext can be used only for writing. |
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* |
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* @param s Used to return the pointer to the created AVIOContext. |
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* In case of failure the pointed to value is set to NULL. |
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* @return 0 in case of success, a negative value corresponding to an |
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* AVERROR code in case of failure |
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*/ |
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int url_fdopen(AVIOContext **s, URLContext *h); |
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#if FF_API_URL_RESETBUF |
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/** Reset the buffer for reading or writing. |
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* @note Will drop any data currently in the buffer without transmitting it. |
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* @param flags URL_RDONLY to set up the buffer for reading, or URL_WRONLY |
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* to set up the buffer for writing. */ |
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int url_resetbuf(AVIOContext *s, int flags); |
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#endif |
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/** |
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* Create and initialize a AVIOContext for accessing the |
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* resource indicated by url. |
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* @note When the resource indicated by url has been opened in |
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* read+write mode, the AVIOContext can be used only for writing. |
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* |
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* @param s Used to return the pointer to the created AVIOContext. |
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* In case of failure the pointed to value is set to NULL. |
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* @param flags flags which control how the resource indicated by url |
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* is to be opened |
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* @return 0 in case of success, a negative value corresponding to an |
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* AVERROR code in case of failure |
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*/ |
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int avio_open(AVIOContext **s, const char *url, int flags); |
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int avio_close(AVIOContext *s); |
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#if FF_API_OLD_AVIO |
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attribute_deprecated URLContext *url_fileno(AVIOContext *s); |
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/** |
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* @deprecated use AVIOContext.max_packet_size directly. |
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*/ |
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attribute_deprecated int url_fget_max_packet_size(AVIOContext *s); |
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attribute_deprecated int url_open_buf(AVIOContext **s, uint8_t *buf, int buf_size, int flags); |
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/** return the written or read size */ |
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attribute_deprecated int url_close_buf(AVIOContext *s); |
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#endif |
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/** |
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* Open a write only memory stream. |
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* |
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* @param s new IO context |
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* @return zero if no error. |
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*/ |
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int url_open_dyn_buf(AVIOContext **s); |
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/** |
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* Open a write only packetized memory stream with a maximum packet |
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* size of 'max_packet_size'. The stream is stored in a memory buffer |
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* with a big endian 4 byte header giving the packet size in bytes. |
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* |
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* @param s new IO context |
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* @param max_packet_size maximum packet size (must be > 0) |
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* @return zero if no error. |
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*/ |
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int url_open_dyn_packet_buf(AVIOContext **s, int max_packet_size); |
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/** |
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* Return the written size and a pointer to the buffer. The buffer |
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* must be freed with av_free(). If the buffer is opened with |
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* url_open_dyn_buf, then padding of FF_INPUT_BUFFER_PADDING_SIZE is |
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* added; if opened with url_open_dyn_packet_buf, no padding is added. |
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* |
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* @param s IO context |
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* @param pbuffer pointer to a byte buffer |
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* @return the length of the byte buffer |
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*/ |
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int url_close_dyn_buf(AVIOContext *s, uint8_t **pbuffer); |
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unsigned long ff_crc04C11DB7_update(unsigned long checksum, const uint8_t *buf, |
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unsigned int len); |
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unsigned long get_checksum(AVIOContext *s); |
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void init_checksum(AVIOContext *s, |
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unsigned long (*update_checksum)(unsigned long c, const uint8_t *p, unsigned int len), |
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unsigned long checksum); |
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#if FF_API_UDP_GET_FILE |
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int udp_get_file_handle(URLContext *h); |
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#endif |
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#endif /* AVFORMAT_AVIO_H */
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