drivers/media/test-drivers/vidtv/vidtv_mux.h

Source file repositories/reference/linux-study-clean/drivers/media/test-drivers/vidtv/vidtv_mux.h

File Facts

System
Linux kernel
Corpus path
drivers/media/test-drivers/vidtv/vidtv_mux.h
Extension
.h
Size
5638 bytes
Lines
183
Domain
Driver Families
Bucket
drivers/media
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct vidtv_mux_timing {
	u64 start_jiffies;
	u64 current_jiffies;
	u64 past_jiffies;

	u64 clk;

	u64 pcr_period_usecs;
	u64 si_period_usecs;
};

/**
 * struct vidtv_mux_si - Store the PSI context.
 *
 * This is used to store the PAT, PMT sections and SDT in use by the muxer.
 *
 * The muxer acquire these by looking into the hardcoded channels in
 * vidtv_channel and then periodically sends the TS packets for them>
 *
 * @pat: The PAT in use by the muxer.
 * @pmt_secs: The PMT sections in use by the muxer. One for each program in the PAT.
 * @sdt: The SDT in use by the muxer.
 * @nit: The NIT in use by the muxer.
 * @eit: the EIT in use by the muxer.
 */
struct vidtv_mux_si {
	/* the SI tables */
	struct vidtv_psi_table_pat *pat;
	struct vidtv_psi_table_pmt **pmt_secs; /* the PMT sections */
	struct vidtv_psi_table_sdt *sdt;
	struct vidtv_psi_table_nit *nit;
	struct vidtv_psi_table_eit *eit;
};

/**
 * struct vidtv_mux_pid_ctx - Store the context for a given TS PID.
 * @pid: The TS PID.
 * @cc: The continuity counter for this PID. It is incremented on every TS
 * pack and it will wrap around at 0xf0. If the decoder notices a sudden jump in
 * this counter this will trigger a discontinuity state.
 * @h: This is embedded in a hash table, mapping pid -> vidtv_mux_pid_ctx
 */
struct vidtv_mux_pid_ctx {
	u16 pid;
	u8 cc; /* continuity counter */
	struct hlist_node h;
};

/**
 * struct vidtv_mux - A muxer abstraction loosely based in libavcodec/mpegtsenc.c
 * @fe: The frontend structure allocated by the muxer.
 * @dev: pointer to struct device.
 * @timing: Keeps track of timing related information.
 * @mux_rate_kbytes_sec: The bit rate for the TS, in kbytes.
 * @pid_ctx: A hash table to keep track of per-PID metadata.
 * @on_new_packets_available_cb: A callback to inform of new TS packets ready.
 * @mux_buf: A pointer to a buffer for this muxer. TS packets are stored there
 * and then passed on to the bridge driver.
 * @mux_buf_sz: The size for 'mux_buf'.
 * @mux_buf_offset: The current offset into 'mux_buf'.
 * @channels: The channels associated with this muxer.
 * @si: Keeps track of the PSI context.
 * @num_streamed_pcr: Number of PCR packets streamed.
 * @num_streamed_si: The number of PSI packets streamed.
 * @mpeg_thread: Thread responsible for the muxer loop.
 * @streaming: whether 'mpeg_thread' is running.
 * @pcr_pid: The TS PID used for the PSI packets. All channels will share the
 * same PCR.
 * @transport_stream_id: The transport stream ID
 * @network_id: The network ID
 * @network_name: The network name
 * @priv: Private data.
 */
struct vidtv_mux {
	struct dvb_frontend *fe;
	struct device *dev;

	struct vidtv_mux_timing timing;

	u32 mux_rate_kbytes_sec;

	DECLARE_HASHTABLE(pid_ctx, 3);

	void (*on_new_packets_available_cb)(void *priv, u8 *buf, u32 npackets);

	u8 *mux_buf;
	u32 mux_buf_sz;
	u32 mux_buf_offset;

	struct vidtv_channel  *channels;

Annotation

Implementation Notes