/* unbuffered I/O */
+/**
+ * URL Context.
+ * New fields can be added to the end with minor version bumps.
+ * Removal, reordering and changes to existing fields require a major
+ * version bump.
+ * sizeof(URLContext) must not be used outside libav*.
+ */
struct URLContext {
+#if LIBAVFORMAT_VERSION_MAJOR >= 53
+ const AVClass *av_class; ///< information for av_log(). Set by url_open().
+#endif
struct URLProtocol *prot;
int flags;
int is_streamed; /**< true if streamed (no seek possible), default = false */
int max_packet_size; /**< if non zero, the stream is packetized with this max packet size */
void *priv_data;
-#if LIBAVFORMAT_VERSION_INT >= (52<<16)
char *filename; /**< specified filename */
-#else
- char filename[1]; /**< specified filename */
-#endif
};
typedef struct URLContext URLContext;
/**
* Return the maximum packet size associated to packetized file
- * handle. If the file is not packetized (stream like http or file on
+ * handle. If the file is not packetized (stream like HTTP or file on
* disk), then 0 is returned.
*
* @param h file handle
void url_get_filename(URLContext *h, char *buf, int buf_size);
/**
- * the callback is called in blocking functions to test regulary if
+ * The callback is called in blocking functions to test regulary if
* asynchronous interruption is needed. AVERROR(EINTR) is returned
* in this case by the interrupted function. 'NULL' means no interrupt
- * callback is given. i
+ * callback is given.
*/
void url_set_interrupt_cb(URLInterruptCB *interrupt_cb);
/* not implemented */
int url_poll(URLPollEntry *poll_table, int n, int timeout);
+/**
+ * Pause and resume playing - only meaningful if using a network streaming
+ * protocol (e.g. MMS).
+ * @param pause 1 for pause, 0 for resume
+ */
+int av_url_read_pause(URLContext *h, int pause);
+
+/**
+ * Seek to a given timestamp relative to some component stream.
+ * Only meaningful if using a network streaming protocol (e.g. MMS.).
+ * @param stream_index The stream index that the timestamp is relative to.
+ * If stream_index is (-1) the timestamp should be in AV_TIME_BASE
+ * units from the beginning of the presentation.
+ * If a stream_index >= 0 is used and the protocol does not support
+ * seeking based on component streams, the call will fail with ENOTSUP.
+ * @param timestamp timestamp in AVStream.time_base units
+ * or if there is no stream specified then in AV_TIME_BASE units.
+ * @param flags Optional combination of AVSEEK_FLAG_BACKWARD, AVSEEK_FLAG_BYTE
+ * and AVSEEK_FLAG_ANY. The protocol may silently ignore
+ * AVSEEK_FLAG_BACKWARD and AVSEEK_FLAG_ANY, but AVSEEK_FLAG_BYTE will
+ * fail with ENOTSUP if used and not supported.
+ * @return >= 0 on success
+ * @see AVInputFormat::read_seek
+ */
+offset_t av_url_read_seek(URLContext *h,
+ int stream_index, int64_t timestamp, int flags);
+
/**
* Passing this as the "whence" parameter to a seek function causes it to
* return the filesize without seeking anywhere. Supporting this is optional.
offset_t (*url_seek)(URLContext *h, offset_t pos, int whence);
int (*url_close)(URLContext *h);
struct URLProtocol *next;
+ int (*url_read_pause)(URLContext *h, int pause);
+ offset_t (*url_read_seek)(URLContext *h,
+ int stream_index, int64_t timestamp, int flags);
} URLProtocol;
extern URLProtocol *first_protocol;
extern URLInterruptCB *url_interrupt_cb;
+URLProtocol *av_protocol_next(URLProtocol *p);
+
int register_protocol(URLProtocol *protocol);
+/**
+ * Bytestream IO Context.
+ * New fields can be added to the end with minor version bumps.
+ * Removal, reordering and changes to existing fields require a major
+ * version bump.
+ * sizeof(ByteIOContext) must not be used outside libav*.
+ */
typedef struct {
unsigned char *buffer;
int buffer_size;
unsigned char *checksum_ptr;
unsigned long (*update_checksum)(unsigned long checksum, const uint8_t *buf, unsigned int size);
int error; ///< contains the error code or 0 if no error happened
+ int (*read_pause)(void *opaque, int pause);
+ offset_t (*read_seek)(void *opaque,
+ int stream_index, int64_t timestamp, int flags);
} ByteIOContext;
int init_put_byte(ByteIOContext *s,
int (*read_packet)(void *opaque, uint8_t *buf, int buf_size),
int (*write_packet)(void *opaque, uint8_t *buf, int buf_size),
offset_t (*seek)(void *opaque, offset_t offset, int whence));
+ByteIOContext *av_alloc_put_byte(
+ 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),
+ offset_t (*seek)(void *opaque, offset_t offset, int whence));
void put_byte(ByteIOContext *s, int b);
void put_buffer(ByteIOContext *s, const unsigned char *buf, int size);
void put_strz(ByteIOContext *s, const char *buf);
+/**
+ * fseek() equivalent for ByteIOContext.
+ * @return new position or AVERROR.
+ */
offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence);
+
+/**
+ * Skip given number of bytes forward.
+ * @param offset number of bytes
+ */
void url_fskip(ByteIOContext *s, offset_t offset);
+
+/**
+ * ftell() equivalent for ByteIOContext.
+ * @return position or AVERROR.
+ */
offset_t url_ftell(ByteIOContext *s);
+
+/**
+ * Gets the filesize.
+ * @return filesize or AVERROR
+ */
offset_t url_fsize(ByteIOContext *s);
+
+/**
+ * feof() equivalent for ByteIOContext.
+ * @return non zero if and only if end of file
+ */
int url_feof(ByteIOContext *s);
+
int url_ferror(ByteIOContext *s);
+int av_url_read_fpause(ByteIOContext *h, int pause);
+offset_t av_url_read_fseek(ByteIOContext *h,
+ int stream_index, int64_t timestamp, int flags);
+
#define URL_EOF (-1)
/** @note return URL_EOF (-1) if EOF */
int url_fgetc(ByteIOContext *s);
void put_flush_packet(ByteIOContext *s);
+
+/**
+ * Reads size bytes from ByteIOContext into buf.
+ * @returns number of bytes read or AVERROR
+ */
int get_buffer(ByteIOContext *s, unsigned char *buf, int size);
+
+/**
+ * Reads size bytes from ByteIOContext into buf.
+ * This reads at most 1 packet. If that's not enough fewer bytes will be
+ * returned.
+ * @returns number of bytes read or AVERROR
+ */
int get_partial_buffer(ByteIOContext *s, unsigned char *buf, int size);
/** @note return 0 if EOF, so you cannot use it if EOF handling is
/** @note when opened as read/write, the buffers are only used for
writing */
-int url_fdopen(ByteIOContext *s, URLContext *h);
+int url_fdopen(ByteIOContext **s, URLContext *h);
/** @warning must be called before any I/O */
int url_setbufsize(ByteIOContext *s, int buf_size);
/** @note when opened as read/write, the buffers are only used for
writing */
-int url_fopen(ByteIOContext *s, const char *filename, int flags);
+int url_fopen(ByteIOContext **s, const char *filename, int flags);
int url_fclose(ByteIOContext *s);
URLContext *url_fileno(ByteIOContext *s);
*/
int url_fget_max_packet_size(ByteIOContext *s);
-int url_open_buf(ByteIOContext *s, uint8_t *buf, int buf_size, int flags);
+int url_open_buf(ByteIOContext **s, uint8_t *buf, int buf_size, int flags);
/** return the written or read size */
int url_close_buf(ByteIOContext *s);
* @param s new IO context
* @return zero if no error.
*/
-int url_open_dyn_buf(ByteIOContext *s);
+int url_open_dyn_buf(ByteIOContext **s);
/**
* Open a write only packetized memory stream with a maximum packet
* @param max_packet_size maximum packet size (must be > 0)
* @return zero if no error.
*/
-int url_open_dyn_packet_buf(ByteIOContext *s, int max_packet_size);
+int url_open_dyn_packet_buf(ByteIOContext **s, int max_packet_size);
/**
* Return the written size and a pointer to the buffer. The buffer
* must be freed with av_free().
* @param s IO context
- * @param pointer to a byte buffer
+ * @param pbuffer pointer to a byte buffer
* @return the length of the byte buffer
*/
int url_close_dyn_buf(ByteIOContext *s, uint8_t **pbuffer);
projects / ffmpeg / blobdiff