* the current audio file.
*/
uint32_t *chunk_table;
+ /** Size of the largest chunk, introduced in v0.6.0. */
+ uint32_t max_chunk_size;
/** Period of time between sending data chunks. */
struct timeval chunk_tv;
/**
int fd;
/** Vss needs this for streaming. */
struct afh_info afhi;
- /** Size of the largest chunk. */
+ /**
+ * Size of the largest chunk. Superseded by afhi->max_chunk_size. May
+ * be removed after v0.6.1.
+ */
uint32_t max_chunk_size;
/** Needed to get the audio file header. */
uint8_t audio_format_id;
* \sa struct afh_info
*/
int (*get_file_info)(char *map, size_t numbytes, int fd,
- struct afh_info *afi);
+ struct afh_info *afhi);
/** Optional, used for header-rewriting. See \ref afh_get_header(). */
void (*get_header)(void *map, size_t mapsize, char **buf, size_t *len);
+ /**
+ * An audio format handler may signify support for dynamic chunks by
+ * defining ->get_chunk below. In this case the vss calls ->open() at
+ * BOS, ->get_chunk() for each chunk while streaming, and ->close() at
+ * EOS. The chunk table is not accessed at all.
+ *
+ * The function may return its (opaque) context through the last
+ * argument. The returned pointer is passed to subsequent calls to
+ * ->get_chunk() and ->close().
+ */
+ int (*open)(const void *map, size_t mapsize, void **afh_context);
+ /**
+ * Return a reference to one chunk. The returned pointer points to a
+ * portion of the memory mapped audio file. The caller must not call
+ * free() on it.
+ */
+ int (*get_chunk)(long unsigned chunk_num, void *afh_context,
+ const char **buf, size_t *len);
+ /** Deallocate the resources occupied by ->open(). */
+ void (*close)(void *afh_context);
/**
* Write audio file with altered tags, optional.
*
int compute_afhi(const char *path, char *data, size_t size,
int fd, struct afh_info *afhi);
const char *audio_format_name(int);
-void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
- void *map, const char **buf, size_t *len);
+__must_check int afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
+ uint8_t audio_format_id, const void *map, size_t mapsize,
+ const char **buf, size_t *len, void **afh_context);
+void afh_close(void *afh_context, uint8_t audio_format_id);
int32_t afh_get_start_chunk(int32_t approx_chunk_num,
- const struct afh_info *afhi);
+ const struct afh_info *afhi, uint8_t audio_format_id);
void afh_get_header(struct afh_info *afhi, uint8_t audio_format_id,
void *map, size_t mapsize, char **buf, size_t *len);
void afh_free_header(char *header_buf, uint8_t audio_format_id);
unsigned afh_get_afhi_txt(int audio_format_num, struct afh_info *afhi, char **result);
int afh_rewrite_tags(int audio_format_id, void *map, size_t mapsize,
struct taginfo *tags, int output_fd, const char *filename);
+void set_max_chunk_size(struct afh_info *afhi);
+bool afh_supports_dynamic_chunks(int audio_format_id);