Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 551 insertions, 0 deletions

diff --git a/drivers/media/test-drivers/vidtv/vidtv_mux.c b/drivers/media/test-drivers/vidtv/vidtv_mux.c
new file mode 100644
index 000000000..f99878eff
--- /dev/null
+++ b/drivers/media/test-drivers/vidtv/vidtv_mux.c
@@ -0,0 +1,551 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Vidtv serves as a reference DVB driver and helps validate the existing APIs
+ * in the media subsystem. It can also aid developers working on userspace
+ * applications.
+ *
+ * This file contains the multiplexer logic for TS packets from different
+ * elementary streams
+ *
+ * Loosely based on libavcodec/mpegtsenc.c
+ *
+ * Copyright (C) 2020 Daniel W. S. Almeida
+ */
+
+#include <linux/delay.h>
+#include <linux/dev_printk.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/math64.h>
+#include <linux/ratelimit.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/vmalloc.h>
+
+#include "vidtv_channel.h"
+#include "vidtv_common.h"
+#include "vidtv_encoder.h"
+#include "vidtv_mux.h"
+#include "vidtv_pes.h"
+#include "vidtv_psi.h"
+#include "vidtv_ts.h"
+
+static struct vidtv_mux_pid_ctx
+*vidtv_mux_get_pid_ctx(struct vidtv_mux *m, u16 pid)
+{
+	struct vidtv_mux_pid_ctx *ctx;
+
+	hash_for_each_possible(m->pid_ctx, ctx, h, pid)
+		if (ctx->pid == pid)
+			return ctx;
+	return NULL;
+}
+
+static struct vidtv_mux_pid_ctx
+*vidtv_mux_create_pid_ctx_once(struct vidtv_mux *m, u16 pid)
+{
+	struct vidtv_mux_pid_ctx *ctx;
+
+	ctx = vidtv_mux_get_pid_ctx(m, pid);
+	if (ctx)
+		return ctx;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return NULL;
+
+	ctx->pid = pid;
+	ctx->cc  = 0;
+	hash_add(m->pid_ctx, &ctx->h, pid);
+
+	return ctx;
+}
+
+static void vidtv_mux_pid_ctx_destroy(struct vidtv_mux *m)
+{
+	struct vidtv_mux_pid_ctx *ctx;
+	struct hlist_node *tmp;
+	int bkt;
+
+	hash_for_each_safe(m->pid_ctx, bkt, tmp, ctx, h) {
+		hash_del(&ctx->h);
+		kfree(ctx);
+	}
+}
+
+static int vidtv_mux_pid_ctx_init(struct vidtv_mux *m)
+{
+	struct vidtv_psi_table_pat_program *p = m->si.pat->program;
+	u16 pid;
+
+	hash_init(m->pid_ctx);
+	/* push the pcr pid ctx */
+	if (!vidtv_mux_create_pid_ctx_once(m, m->pcr_pid))
+		return -ENOMEM;
+	/* push the NULL packet pid ctx */
+	if (!vidtv_mux_create_pid_ctx_once(m, TS_NULL_PACKET_PID))
+		goto free;
+	/* push the PAT pid ctx */
+	if (!vidtv_mux_create_pid_ctx_once(m, VIDTV_PAT_PID))
+		goto free;
+	/* push the SDT pid ctx */
+	if (!vidtv_mux_create_pid_ctx_once(m, VIDTV_SDT_PID))
+		goto free;
+	/* push the NIT pid ctx */
+	if (!vidtv_mux_create_pid_ctx_once(m, VIDTV_NIT_PID))
+		goto free;
+	/* push the EIT pid ctx */
+	if (!vidtv_mux_create_pid_ctx_once(m, VIDTV_EIT_PID))
+		goto free;
+
+	/* add a ctx for all PMT sections */
+	while (p) {
+		pid = vidtv_psi_get_pat_program_pid(p);
+		vidtv_mux_create_pid_ctx_once(m, pid);
+		p = p->next;
+	}
+
+	return 0;
+
+free:
+	vidtv_mux_pid_ctx_destroy(m);
+	return -ENOMEM;
+}
+
+static void vidtv_mux_update_clk(struct vidtv_mux *m)
+{
+	/* call this at every thread iteration */
+	u64 elapsed_time;
+
+	m->timing.past_jiffies = m->timing.current_jiffies;
+	m->timing.current_jiffies = get_jiffies_64();
+
+	elapsed_time = jiffies_to_usecs(m->timing.current_jiffies -
+					m->timing.past_jiffies);
+
+	/* update the 27Mhz clock proportionally to the elapsed time */
+	m->timing.clk += (CLOCK_UNIT_27MHZ / USEC_PER_SEC) * elapsed_time;
+}
+
+static u32 vidtv_mux_push_si(struct vidtv_mux *m)
+{
+	struct vidtv_psi_pat_write_args pat_args = {
+		.buf                = m->mux_buf,
+		.buf_sz             = m->mux_buf_sz,
+		.pat                = m->si.pat,
+	};
+	struct vidtv_psi_pmt_write_args pmt_args = {
+		.buf                = m->mux_buf,
+		.buf_sz             = m->mux_buf_sz,
+		.pcr_pid            = m->pcr_pid,
+	};
+	struct vidtv_psi_sdt_write_args sdt_args = {
+		.buf                = m->mux_buf,
+		.buf_sz             = m->mux_buf_sz,
+		.sdt                = m->si.sdt,
+	};
+	struct vidtv_psi_nit_write_args nit_args = {
+		.buf                = m->mux_buf,
+		.buf_sz             = m->mux_buf_sz,
+		.nit                = m->si.nit,
+
+	};
+	struct vidtv_psi_eit_write_args eit_args = {
+		.buf                = m->mux_buf,
+		.buf_sz             = m->mux_buf_sz,
+		.eit                = m->si.eit,
+	};
+	u32 initial_offset = m->mux_buf_offset;
+	struct vidtv_mux_pid_ctx *pat_ctx;
+	struct vidtv_mux_pid_ctx *pmt_ctx;
+	struct vidtv_mux_pid_ctx *sdt_ctx;
+	struct vidtv_mux_pid_ctx *nit_ctx;
+	struct vidtv_mux_pid_ctx *eit_ctx;
+	u32 nbytes;
+	u16 pmt_pid;
+	u32 i;
+
+	pat_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_PAT_PID);
+	sdt_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_SDT_PID);
+	nit_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_NIT_PID);
+	eit_ctx = vidtv_mux_get_pid_ctx(m, VIDTV_EIT_PID);
+
+	pat_args.offset             = m->mux_buf_offset;
+	pat_args.continuity_counter = &pat_ctx->cc;
+
+	m->mux_buf_offset += vidtv_psi_pat_write_into(&pat_args);
+
+	for (i = 0; i < m->si.pat->num_pmt; ++i) {
+		pmt_pid = vidtv_psi_pmt_get_pid(m->si.pmt_secs[i],
+						m->si.pat);
+
+		if (pmt_pid > TS_LAST_VALID_PID) {
+			dev_warn_ratelimited(m->dev,
+					     "PID: %d not found\n", pmt_pid);
+			continue;
+		}
+
+		pmt_ctx = vidtv_mux_get_pid_ctx(m, pmt_pid);
+
+		pmt_args.offset             = m->mux_buf_offset;
+		pmt_args.pmt                = m->si.pmt_secs[i];
+		pmt_args.pid                = pmt_pid;
+		pmt_args.continuity_counter = &pmt_ctx->cc;
+
+		/* write each section into buffer */
+		m->mux_buf_offset += vidtv_psi_pmt_write_into(&pmt_args);
+	}
+
+	sdt_args.offset             = m->mux_buf_offset;
+	sdt_args.continuity_counter = &sdt_ctx->cc;
+
+	m->mux_buf_offset += vidtv_psi_sdt_write_into(&sdt_args);
+
+	nit_args.offset             = m->mux_buf_offset;
+	nit_args.continuity_counter = &nit_ctx->cc;
+
+	m->mux_buf_offset += vidtv_psi_nit_write_into(&nit_args);
+
+	eit_args.offset             = m->mux_buf_offset;
+	eit_args.continuity_counter = &eit_ctx->cc;
+
+	m->mux_buf_offset += vidtv_psi_eit_write_into(&eit_args);
+
+	nbytes = m->mux_buf_offset - initial_offset;
+
+	m->num_streamed_si++;
+
+	return nbytes;
+}
+
+static u32 vidtv_mux_push_pcr(struct vidtv_mux *m)
+{
+	struct pcr_write_args args = {};
+	struct vidtv_mux_pid_ctx *ctx;
+	u32 nbytes = 0;
+
+	ctx                     = vidtv_mux_get_pid_ctx(m, m->pcr_pid);
+	args.dest_buf           = m->mux_buf;
+	args.pid                = m->pcr_pid;
+	args.buf_sz             = m->mux_buf_sz;
+	args.continuity_counter = &ctx->cc;
+
+	/* the 27Mhz clock will feed both parts of the PCR bitfield */
+	args.pcr = m->timing.clk;
+
+	nbytes += vidtv_ts_pcr_write_into(args);
+	m->mux_buf_offset += nbytes;
+
+	m->num_streamed_pcr++;
+
+	return nbytes;
+}
+
+static bool vidtv_mux_should_push_pcr(struct vidtv_mux *m)
+{
+	u64 next_pcr_at;
+
+	if (m->num_streamed_pcr == 0)
+		return true;
+
+	next_pcr_at = m->timing.start_jiffies +
+		      usecs_to_jiffies(m->num_streamed_pcr *
+				       m->timing.pcr_period_usecs);
+
+	return time_after64(m->timing.current_jiffies, next_pcr_at);
+}
+
+static bool vidtv_mux_should_push_si(struct vidtv_mux *m)
+{
+	u64 next_si_at;
+
+	if (m->num_streamed_si == 0)
+		return true;
+
+	next_si_at = m->timing.start_jiffies +
+		     usecs_to_jiffies(m->num_streamed_si *
+				      m->timing.si_period_usecs);
+
+	return time_after64(m->timing.current_jiffies, next_si_at);
+}
+
+static u32 vidtv_mux_packetize_access_units(struct vidtv_mux *m,
+					    struct vidtv_encoder *e)
+{
+	struct pes_write_args args = {
+		.dest_buf           = m->mux_buf,
+		.dest_buf_sz        = m->mux_buf_sz,
+		.pid                = be16_to_cpu(e->es_pid),
+		.encoder_id         = e->id,
+		.stream_id          = be16_to_cpu(e->stream_id),
+		.send_pts           = true,  /* forbidden value '01'... */
+		.send_dts           = false, /* ...for PTS_DTS flags    */
+	};
+	struct vidtv_access_unit *au = e->access_units;
+	u32 initial_offset = m->mux_buf_offset;
+	struct vidtv_mux_pid_ctx *pid_ctx;
+	u32 nbytes = 0;
+	u8 *buf = NULL;
+
+	/* see SMPTE 302M clause 6.4 */
+	if (args.encoder_id == S302M) {
+		args.send_dts = false;
+		args.send_pts = true;
+	}
+
+	pid_ctx = vidtv_mux_create_pid_ctx_once(m, be16_to_cpu(e->es_pid));
+	args.continuity_counter = &pid_ctx->cc;
+
+	while (au) {
+		buf                  = e->encoder_buf + au->offset;
+		args.from            = buf;
+		args.access_unit_len = au->nbytes;
+		args.dest_offset     = m->mux_buf_offset;
+		args.pts             = au->pts;
+		args.pcr	     = m->timing.clk;
+
+		m->mux_buf_offset += vidtv_pes_write_into(&args);
+
+		au = au->next;
+	}
+
+	/*
+	 * clear the encoder state once the ES data has been written to the mux
+	 * buffer
+	 */
+	e->clear(e);
+
+	nbytes = m->mux_buf_offset - initial_offset;
+	return nbytes;
+}
+
+static u32 vidtv_mux_poll_encoders(struct vidtv_mux *m)
+{
+	struct vidtv_channel *cur_chnl = m->channels;
+	struct vidtv_encoder *e = NULL;
+	u32 nbytes = 0;
+	u32 au_nbytes;
+
+	while (cur_chnl) {
+		e = cur_chnl->encoders;
+
+		while (e) {
+			e->encode(e);
+			/* get the TS packets into the mux buffer */
+			au_nbytes = vidtv_mux_packetize_access_units(m, e);
+			nbytes += au_nbytes;
+			m->mux_buf_offset += au_nbytes;
+			/* grab next encoder */
+			e = e->next;
+		}
+
+		/* grab the next channel */
+		cur_chnl = cur_chnl->next;
+	}
+
+	return nbytes;
+}
+
+static u32 vidtv_mux_pad_with_nulls(struct vidtv_mux *m, u32 npkts)
+{
+	struct null_packet_write_args args = {
+		.dest_buf           = m->mux_buf,
+		.buf_sz             = m->mux_buf_sz,
+		.dest_offset        = m->mux_buf_offset,
+	};
+	u32 initial_offset = m->mux_buf_offset;
+	struct vidtv_mux_pid_ctx *ctx;
+	u32 nbytes;
+	u32 i;
+
+	ctx = vidtv_mux_get_pid_ctx(m, TS_NULL_PACKET_PID);
+
+	args.continuity_counter = &ctx->cc;
+
+	for (i = 0; i < npkts; ++i) {
+		m->mux_buf_offset += vidtv_ts_null_write_into(args);
+		args.dest_offset  = m->mux_buf_offset;
+	}
+
+	nbytes = m->mux_buf_offset - initial_offset;
+
+	/* sanity check */
+	if (nbytes != npkts * TS_PACKET_LEN)
+		dev_err_ratelimited(m->dev, "%d != %d\n",
+				    nbytes, npkts * TS_PACKET_LEN);
+
+	return nbytes;
+}
+
+static void vidtv_mux_clear(struct vidtv_mux *m)
+{
+	/* clear the packets currently in the mux */
+	memset(m->mux_buf, 0, m->mux_buf_sz * sizeof(*m->mux_buf));
+	/* point to the beginning of the buffer again */
+	m->mux_buf_offset = 0;
+}
+
+#define ERR_RATE 10000000
+static void vidtv_mux_tick(struct work_struct *work)
+{
+	struct vidtv_mux *m = container_of(work,
+					   struct vidtv_mux,
+					   mpeg_thread);
+	struct dtv_frontend_properties *c = &m->fe->dtv_property_cache;
+	u32 tot_bits = 0;
+	u32 nbytes;
+	u32 npkts;
+
+	while (m->streaming) {
+		nbytes = 0;
+
+		vidtv_mux_update_clk(m);
+
+		if (vidtv_mux_should_push_pcr(m))
+			nbytes += vidtv_mux_push_pcr(m);
+
+		if (vidtv_mux_should_push_si(m))
+			nbytes += vidtv_mux_push_si(m);
+
+		nbytes += vidtv_mux_poll_encoders(m);
+		nbytes += vidtv_mux_pad_with_nulls(m, 256);
+
+		npkts = nbytes / TS_PACKET_LEN;
+
+		/* if the buffer is not aligned there is a bug somewhere */
+		if (nbytes % TS_PACKET_LEN)
+			dev_err_ratelimited(m->dev, "Misaligned buffer\n");
+
+		if (m->on_new_packets_available_cb)
+			m->on_new_packets_available_cb(m->priv,
+						       m->mux_buf,
+						       npkts);
+
+		vidtv_mux_clear(m);
+
+		/*
+		 * Update bytes and packet counts at DVBv5 stats
+		 *
+		 * For now, both pre and post bit counts are identical,
+		 * but post BER count can be lower than pre BER, if the error
+		 * correction logic discards packages.
+		 */
+		c->pre_bit_count.stat[0].uvalue = nbytes * 8;
+		c->post_bit_count.stat[0].uvalue = nbytes * 8;
+		c->block_count.stat[0].uvalue += npkts;
+
+		/*
+		 * Even without any visible errors for the user, the pre-BER
+		 * stats usually have an error range up to 1E-6. So,
+		 * add some random error increment count to it.
+		 *
+		 * Please notice that this is a poor guy's implementation,
+		 * as it will produce one corrected bit error every time
+		 * ceil(total bytes / ERR_RATE) is incremented, without
+		 * any sort of (pseudo-)randomness.
+		 */
+		tot_bits += nbytes * 8;
+		if (tot_bits > ERR_RATE) {
+			c->pre_bit_error.stat[0].uvalue++;
+			tot_bits -= ERR_RATE;
+		}
+
+		usleep_range(VIDTV_SLEEP_USECS, VIDTV_MAX_SLEEP_USECS);
+	}
+}
+
+void vidtv_mux_start_thread(struct vidtv_mux *m)
+{
+	if (m->streaming) {
+		dev_warn_ratelimited(m->dev, "Already streaming. Skipping.\n");
+		return;
+	}
+
+	m->streaming = true;
+	m->timing.start_jiffies = get_jiffies_64();
+	schedule_work(&m->mpeg_thread);
+}
+
+void vidtv_mux_stop_thread(struct vidtv_mux *m)
+{
+	if (m->streaming) {
+		m->streaming = false; /* thread will quit */
+		cancel_work_sync(&m->mpeg_thread);
+	}
+}
+
+struct vidtv_mux *vidtv_mux_init(struct dvb_frontend *fe,
+				 struct device *dev,
+				 struct vidtv_mux_init_args *args)
+{
+	struct vidtv_mux *m;
+
+	m = kzalloc(sizeof(*m), GFP_KERNEL);
+	if (!m)
+		return NULL;
+
+	m->dev = dev;
+	m->fe = fe;
+	m->timing.pcr_period_usecs = args->pcr_period_usecs;
+	m->timing.si_period_usecs  = args->si_period_usecs;
+
+	m->mux_rate_kbytes_sec = args->mux_rate_kbytes_sec;
+
+	m->on_new_packets_available_cb = args->on_new_packets_available_cb;
+
+	m->mux_buf = vzalloc(args->mux_buf_sz);
+	if (!m->mux_buf)
+		goto free_mux;
+
+	m->mux_buf_sz = args->mux_buf_sz;
+
+	m->pcr_pid = args->pcr_pid;
+	m->transport_stream_id = args->transport_stream_id;
+	m->priv = args->priv;
+	m->network_id = args->network_id;
+	m->network_name = kstrdup(args->network_name, GFP_KERNEL);
+	if (!m->network_name)
+		goto free_mux_buf;
+
+	m->timing.current_jiffies = get_jiffies_64();
+
+	if (args->channels)
+		m->channels = args->channels;
+	else
+		if (vidtv_channels_init(m) < 0)
+			goto free_mux_network_name;
+
+	/* will alloc data for pmt_sections after initializing pat */
+	if (vidtv_channel_si_init(m) < 0)
+		goto free_channels;
+
+	INIT_WORK(&m->mpeg_thread, vidtv_mux_tick);
+
+	if (vidtv_mux_pid_ctx_init(m) < 0)
+		goto free_channel_si;
+
+	return m;
+
+free_channel_si:
+	vidtv_channel_si_destroy(m);
+free_channels:
+	vidtv_channels_destroy(m);
+free_mux_network_name:
+	kfree(m->network_name);
+free_mux_buf:
+	vfree(m->mux_buf);
+free_mux:
+	kfree(m);
+	return NULL;
+}
+
+void vidtv_mux_destroy(struct vidtv_mux *m)
+{
+	vidtv_mux_stop_thread(m);
+	vidtv_mux_pid_ctx_destroy(m);
+	vidtv_channel_si_destroy(m);
+	vidtv_channels_destroy(m);
+	kfree(m->network_name);
+	vfree(m->mux_buf);
+	kfree(m);
+}