Easy H.264 video streaming with Freescale's i.mx27 and Linux
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1 Libre Software Meeting 2009 Easy H.264 video streaming with Freescale's i.mx27 and Linux July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 1
2 Presentation plan 1) i.mx27 & H.264 basics 2) Design by example 3) Demo July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 2
3 Who am I? Julien Boibessot Embedded systems engineer Co founder of the Armadeus Project association ( Co founder of ARMadeus Systems ( July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 3
4 Platform used: APF27 ARM9 400MHz (i.mx27 Freescale) Up to 256 MB RAM DDR 266MHz Up to 512 MB Flash NAND 16 bits Spartan3A k gates Low power (<10mW sleep mode) July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 4
5 1) Basics (i.mx27 & H.264) July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 5
6 i.mx27 Freescale i.mx Family ARM926EJ S core up to 400MHz Low power Video over IP and industrial remote control applications code=i.mx27&nodeid= rh31143zrdr66af July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 6
7 i.mx27 Integrated peripherals MPEG 4/H.263/H.264 HW Codec High speed CMOS Sensor Interface (CSI) 10/100 Mbps Ethernet MAC 18bits LCD controller up to 800x600 (overlay) 3 x MMC/SD July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 7
8 i.mx27 Integrated peripherals (2) NAND 16bits controller DDR RAM 32 bits controller USB OTG high speed, host x 2 CSPI x 3, SSI/I2S x 2, I2C x 2, UART x 6 July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 8
9 Video Hardware Codec H.263/H.264/MPEG4 Up to 30fps DMA to reduce CPU usage Encode a format while decoding another July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 9
10 Video Hardware Codec (2) Black box (16 bits DSP + hardware modules) July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 10
11 H.264 Basics (1) H.264 = Advanced Video Coding (AVC) = MPEG4 Part10 Mix H.263 (IUT T) MPEG4 (ISO) => Joint Video Group Goals: Same quality than others with bitrate / 2 Better quality with same bitrate July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 11
12 H.264 Basics (2) Better performances but more computational power (2 to 4x) Flexibility with several quality level (low high bitrates) = profiles: Baseline, Main, Extended, High Video over IP oriented Patented royalties for commercial use July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 12
13 H.264 Basics (3) Network Adaptation Layer Units (NALUs) Parameter sets Slices (encoded image or part of image) suitable for transmission over packet networks July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 13
14 H.264 Basics (4) Network Abstraction Layer Unit July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 14
15 H.264 Packets transport: RTP RTP = Real Time Protocol Try to bring real time transmission to IP Sequence numbering & timestamp Upper layer to UDP (unicast or multicast) Unidirectionnal July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 15
16 H.264 Packets transport: RTP RFC 3984: RTP Payload Format for H.264 Several ways of forming RTP packets with NALUs: Single NALU per packet Single time aggregation packet Multiple time aggregation packet Fragmentation July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 16
17 RFC 3984 example Single NALU per packet (RTP header) July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 17
18 RFC 3984 example Single NALU: Full RTP packet July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 18
19 2) Design by example July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 19
20 Custom design Portable video recorder/transmitter Requirements: VGA 25 fps Real time video transmit over WiFi Video preview on LCD Recording of video on SDCard July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 20
21 Video capture (hardware) OV9653 (CMOS sensor) 8/10 bits data bus + sync 30 fps / 15 fps Configuration with I2C!! Datasheets!! July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 21
22 Video capture (software) Conf only July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 22
23 Video preprocessing (hardware) i.mx27 Video Pre Processor (extracted from Freescale's datasheets and simplified) July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 23
24 LCD preview (hardware) TFT 480x272 i.mx27 internal controller July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 24
25 LCD preview (software) July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 25
26 Video Encoding (hardware) July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 26
27 Video encoding (software) July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 27
28 Video storage SD/MMC support in Linux since 2.6.2x i.mx27 controller supported Simple as opening and writing in a file Header July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 28
29 Video transmission WiFi (SDIO or USB) Encryption: WEP: iwconfig alone WPA: need of a WPA supplicant Socket UDP, port 6666 (free one) RTP as top layer (cf slide 15) July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 29
30 3) Demo July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 30
31 Demo I2C & CSI Ethernet H.264 o RTP o UDP o WiFi July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 31
32 Decoding on PC gstreamer $ gst launch 0.10 udpsrc port=6666 caps="application/x rtp, media=(string)video, clock rate=(int)90000, encodingname=(string)h264"! rtph264depay! ffdec_h264! xvimagesink July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 32
33 To Be Done Better image synchro with double buffering RTCP/RTSP: (VLC compatible) Tactile GUI Sound July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 33
34 Any questions? July 8th 2009 LSM, Nantes: Easy H.264 video streaming with i.mx27 and Linux 34
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