mirror of https://git.ffmpeg.org/ffmpeg.git
152 lines
4.7 KiB
C
152 lines
4.7 KiB
C
/* output byte stream handling */
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typedef long long offset_t;
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/* unbuffered I/O */
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struct URLContext {
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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 packet_size;
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void *priv_data;
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};
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typedef struct URLFormat {
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char format_name[32];
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int sample_rate;
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int frame_rate;
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int channels;
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int height;
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int width;
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int pix_fmt;
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} URLFormat;
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typedef struct URLContext 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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#define URL_RDONLY 0
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#define URL_WRONLY 1
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int url_open(URLContext **h, const char *filename, 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, unsigned char *buf, int size);
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offset_t url_seek(URLContext *h, offset_t pos, int whence);
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int url_getformat(URLContext *h, URLFormat *f);
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int url_close(URLContext *h);
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int url_exist(const char *filename);
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offset_t url_filesize(URLContext *h);
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/* not implemented */
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int url_poll(URLPollEntry *poll_table, int n, int timeout);
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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 *filename, 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, unsigned char *buf, int size);
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offset_t (*url_seek)(URLContext *h, offset_t pos, int whence);
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int (*url_close)(URLContext *h);
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/* get precise information about the format, if available. return
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-ENODATA if not available */
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int (*url_getformat)(URLContext *h, URLFormat *f);
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struct URLProtocol *next;
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} URLProtocol;
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extern URLProtocol *first_protocol;
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int register_protocol(URLProtocol *protocol);
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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 *buf, int buf_size);
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void (*write_packet)(void *opaque, UINT8 *buf, int buf_size);
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int (*seek)(void *opaque, offset_t offset, int whence);
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offset_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 packet_size;
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} ByteIOContext;
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int init_put_byte(ByteIOContext *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 *buf, int buf_size),
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void (*write_packet)(void *opaque, UINT8 *buf, int buf_size),
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int (*seek)(void *opaque, offset_t offset, int whence));
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void put_byte(ByteIOContext *s, int b);
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void put_buffer(ByteIOContext *s, unsigned char *buf, int size);
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void put_le64(ByteIOContext *s, unsigned long long val);
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void put_be64(ByteIOContext *s, unsigned long long val);
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void put_le32(ByteIOContext *s, unsigned int val);
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void put_be32(ByteIOContext *s, unsigned int val);
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void put_le16(ByteIOContext *s, unsigned int val);
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void put_be16(ByteIOContext *s, unsigned int val);
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void put_tag(ByteIOContext *s, char *tag);
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offset_t url_fseek(ByteIOContext *s, offset_t offset, int whence);
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void url_fskip(ByteIOContext *s, offset_t offset);
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offset_t url_ftell(ByteIOContext *s);
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int url_feof(ByteIOContext *s);
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void put_flush_packet(ByteIOContext *s);
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int get_buffer(ByteIOContext *s, unsigned char *buf, int size);
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int get_byte(ByteIOContext *s);
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unsigned int get_le32(ByteIOContext *s);
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unsigned long long get_le64(ByteIOContext *s);
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unsigned int get_le16(ByteIOContext *s);
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unsigned int get_be16(ByteIOContext *s);
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unsigned int get_be32(ByteIOContext *s);
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unsigned long long get_be64(ByteIOContext *s);
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extern inline int url_is_streamed(ByteIOContext *s)
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{
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return s->is_streamed;
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}
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/* get the prefered packet size of the device. All I/Os should be done
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by multiple of this size */
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extern inline int url_get_packet_size(ByteIOContext *s)
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{
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return s->packet_size;
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}
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int url_fdopen(ByteIOContext *s, URLContext *h);
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int url_setbufsize(ByteIOContext *s, int buf_size);
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int url_fopen(ByteIOContext *s, const char *filename, int flags);
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int url_fclose(ByteIOContext *s);
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URLContext *url_fileno(ByteIOContext *s);
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int url_open_buf(ByteIOContext *s, UINT8 *buf, int buf_size, int flags);
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int url_close_buf(ByteIOContext *s);
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/* file.c */
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extern URLProtocol file_protocol;
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extern URLProtocol pipe_protocol;
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/* udp.c */
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extern URLProtocol udp_protocol;
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/* http.c */
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extern URLProtocol http_protocol;
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/* audio.c */
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extern const char *audio_device;
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extern URLProtocol audio_protocol;
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/* grab.c */
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extern const char *v4l_device;
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extern URLProtocol video_protocol;
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