Hi Daniel, Em Fri, 21 Aug 2020 09:58:44 -0300 "Daniel W. S. Almeida" <dwlsalmeida@xxxxxxxxx> escreveu: > From: "Daniel W. S. Almeida" <dwlsalmeida@xxxxxxxxx> > > This series is work in progress. It represents the current work done on a > virtual DVB driver for the Linux media subsystem. I am new to the media > subsystem and to kernel development in general. > > This driver aims to: > - Serve as template for new DVB driver writers > - Help userspace application writers in general > - Push fake audio/video to userspace for testing > purposes > - Push debug information to userspace via debugfs > > Current state for this driver: > - Driver generates PSI information (PAT, PMT, SDT) > - Driver generates PCR packets > - Driver generates NULL packets for padding > - PCM audio stream is decoded by ffmpeg, but no audio is heard yet. > > changes in v10: > s302m encoder got reworked Thanks for all the hard work on it. Very much appreciated! I finally found some time to test it. For now, just a quick test from my side, without passing any arguments to the driver. See enclosed. While there are still a few issues there, I'm considering applying this series for Kernel 5.10. My plan is to write some patches on the top of yours, in order to address the problems I'll find on it. If not something more critical won't be solved in time, we may still add it at staging/media. Let's see. The problems I noticed so far are: 1. rmmod doesn't work; 2. dvbv5-stats doesn't seem to be working properly, as it is reporting signal strengh with a percentage (same for Carrier S/N ratio); 3. dvbv5-zap wrote an empty audio file (without -P flag). Probably there are still some issues at the program channel descriptor or service; 4. The provider service field is null. Perhaps we could add some string there, like "linuxtv.org". 5. Maybe we could also add a simple NIT table, just to avoid dvbv5-scan to wait for it until timeout. Also, it probably makes sense to add a debugfs interface in order to allow injecting errors at the stream at runtime. Regards, Mauro --- $ dvbv5-scan -v foobar using demux 'dvb0.demux0' Device Dummy demod for DVB-T/T2/C/S/S2 (/dev/dvb/adapter0/frontend0) capabilities: CAN_FEC_1_2 CAN_FEC_2_3 CAN_FEC_3_4 CAN_FEC_4_5 CAN_FEC_5_6 CAN_FEC_6_7 CAN_FEC_7_8 CAN_FEC_8_9 CAN_FEC_AUTO CAN_GUARD_INTERVAL_AUTO CAN_HIERARCHY_AUTO CAN_INVERSION_AUTO CAN_QAM_16 CAN_QAM_32 CAN_QAM_64 CAN_QAM_128 CAN_QAM_256 CAN_QAM_AUTO CAN_QPSK CAN_TRANSMISSION_MODE_AUTO DVB API Version 5.11, Current v5 delivery system: DVBC/ANNEX_A Supported delivery systems: DVBT DVBT2 [DVBC/ANNEX_A] DVBS DVBS2 Frequency range for the current standard: From: 51.0 MHz To: 2.15 GHz Step: 62.5 kHz Tolerance: 29.5 MHz Symbol rate ranges for the current standard: From: 1.00 MBauds To: 45.0 MBauds Failed to guess country from the current locale setting. ERROR command BANDWIDTH_HZ (5) not found during retrieve Cannot calc frequency shift. Either bandwidth/symbol-rate is unavailable (yet). Scanning frequency #1 330000000 FREQUENCY = 330000000 MODULATION = QAM/AUTO INVERSION = AUTO SYMBOL_RATE = 6940000 INNER_FEC = AUTO DELIVERY_SYSTEM = DVBC/ANNEX_A Got parameters for DVBC/ANNEX_A: FREQUENCY = 330000000 MODULATION = QAM/AUTO INVERSION = AUTO SYMBOL_RATE = 6940000 INNER_FEC = AUTO DELIVERY_SYSTEM = DVBC/ANNEX_A Lock (0x1f) Signal= 0.00% C/N= 0.00% UCB= 0 postBER= 0 dvb_read_sections: waiting for table ID 0x00, program ID 0x00 dvb_parse_section: received table 0x00, extension ID 0x0744, section 0/0 dvb_parse_section: table 0x00, extension ID 0x0744: done PAT | table_id 0x00 | section_length 13 | one 2 | zero 0 | syntax 1 | transport_stream_id 1860 | current_next 1 | version 1 | one2 3 | section_number 0 | last_section_number 0 |\ 1 program pid | pid 0x0101: service 0x0880 Program #0 ID 0x0101, service ID 0x0880 dvb_read_sections: waiting for table ID 0x02, program ID 0x101 dvb_parse_section: received table 0x02, extension ID 0x0880, section 0/0 dvb_parse_section: table 0x02, extension ID 0x0880: done PMT | table_id 0x02 | section_length 24 | one 2 | zero 0 | syntax 1 | transport_stream_id 2176 | current_next 1 | version 1 | one2 3 | section_number 0 | last_section_number 0 |- pcr_pid 0200 | reserved2 7 | descriptor length 0 | zero3 0 | reserved3 15 |\ |- stream 0x0111: ISO/IEC 13818-1 Private Data (6) | descriptor length 6 | 0x05: registration_descriptor | 42 53 53 44 BSSD |_ 1 streams dvb_read_sections: waiting for table ID 0x40, program ID 0x10 ERROR dvb_read_sections: no data read on section filter ERROR error while reading the NIT table dvb_read_sections: waiting for table ID 0x42, program ID 0x11 dvb_parse_section: received table 0x42, extension ID 0x0744, section 0/0 dvb_parse_section: table 0x42, extension ID 0x0744: done SDT | table_id 0x42 | section_length 48 | one 2 | zero 1 | syntax 1 | transport_stream_id 1860 | current_next 1 | version 1 | one2 3 | section_number 0 | last_section_number 0 | network_id 1860 | reserved 255 |\ |- service 0x0880 | EIT schedule 0 | EIT present following 0 | free CA mode 0 | running status 4 | descriptor length 31 | 0x48: service_descriptor | service type 1 | provider '(null)' | name 'S302m: Sine Wave PCM Audio' |_ 1 services Service S302m: Sine Wave PCM Audio, provider (null): digital television Storing as channel S302m: Sine Wave PCM Audio $ dvbv5-zap -c dvb_channel.conf "S302m: Sine Wave PCM Audio" -m ... PID FREQ SPEED TOTAL 0 25.07 p/s 36.826 Kbps 55 KB 17 25.07 p/s 36.826 Kbps 55 KB 257 25.07 p/s 36.826 Kbps 55 KB 273 1335.19 p/s 1.915 Mbps 2943 KB 512 25.07 p/s 36.826 Kbps 55 KB 8191 16775.59 p/s 24.062 Mbps 36974 KB TOT 18211.08 p/s 26.121 Mbps 40138 KB Lock (0x1f) Signal= 0.00% C/N= 0.00% UCB= 0 postBER= 0 $ dvbv5-zap -c dvb_channel.conf "S302m: Sine Wave PCM Audio" -t 30 -o pcm_audio.ts using demux 'dvb0.demux0' reading channels from file 'dvb_channel.conf' service has pid type 06: 273 tuning to 330000000 Hz (0x00) Signal= 0.00% C/N= 0.00% UCB= 0 postBER= 0 Lock (0x1f) Signal= 0.00% C/N= 0.00% UCB= 0 postBER= 0 Lock (0x1f) Signal= 0.00% C/N= 0.00% UCB= 0 postBER= 0 Record to file 'pcm_audio.ts' started Forcing program stop due to timeout or terminate signal $ ls -l pcm_audio.ts -rw-r--r-- 1 mchehab mchehab 0 Sep 11 09:46 pcm_audio.ts $ dvbv5-zap -c dvb_channel.conf "S302m: Sine Wave PCM Audio" -t 30 -o pcm_audio.ts -P using demux 'dvb0.demux0' reading channels from file 'dvb_channel.conf' service has pid type 06: 273 tuning to 330000000 Hz pass all PID's to TS dvb_set_pesfilter 8192 dvb_dev_set_bufsize: buffer set to 6160384 Lock (0x1f) Signal= 0.00% C/N= 0.00% UCB= 0 postBER= 0 Lock (0x1f) Signal= 0.00% C/N= 0.00% UCB= 0 postBER= 0 Record to file 'pcm_audio.ts' started received 103809840 bytes (3379 Kbytes/sec) Lock (0x1f) Signal= 0.00% C/N= 0.00% UCB= 0 postBER= 0 $ ls -lh pcm_audio.ts -rw-r--r-- 1 mchehab mchehab 100M Sep 11 09:54 pcm_audio.ts
