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author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-09 09:47:22 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-07-09 09:47:22 -0700 |
commit | ed63b9c873601ca113da5c7b1745e3946493e9f3 (patch) | |
tree | 94e96db2b79a8d123c0645dd64b3830bc4d20bfe /drivers/media/platform/coda/coda-mpeg2.c | |
parent | Merge tag 'please-pull-for_5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras (diff) | |
parent | media: allegro: use new v4l2_m2m_ioctl_try_encoder_cmd funcs (diff) | |
download | linux-dev-ed63b9c873601ca113da5c7b1745e3946493e9f3.tar.xz linux-dev-ed63b9c873601ca113da5c7b1745e3946493e9f3.zip |
Merge tag 'media/v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media
Pull media updates from Mauro Carvalho Chehab:
- new Atmel microship ISC driver
- coda has gained support for mpeg2 and mpeg4
- cxusb gained support for analog TV
- rockchip staging driver was split into two separate staging drivers
- added a new staging driver for Allegro DVT video IP core
- added a new staging driver for Amlogic Meson video decoder
- lots of improvements and cleanups
* tag 'media/v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (398 commits)
media: allegro: use new v4l2_m2m_ioctl_try_encoder_cmd funcs
media: doc-rst: Fix typos
media: radio-raremono: change devm_k*alloc to k*alloc
media: stv0297: fix frequency range limit
media: rc: Prefer KEY_NUMERIC_* for number buttons on remotes
media: dvb_frontend: split dvb_frontend_handle_ioctl function
media: mceusb: disable "nonsensical irdata" messages
media: rc: remove redundant dev_err message
media: cec-notifier: add new notifier functions
media: cec: add struct cec_connector_info support
media: cec-notifier: rename variables, check kstrdup and n->conn_name
media: MAINTAINERS: Add maintainers for Media Controller
media: staging: media: tegra-vde: Defer dmabuf's unmapping
media: staging: media: tegra-vde: Add IOMMU support
media: hdpvr: fix locking and a missing msleep
media: v4l2: Test type instead of cfg->type in v4l2_ctrl_new_custom()
media: atmel: atmel-isc: fix i386 build error
media: v4l2-ctrl: Move compound control initialization
media: hantro: Use vb2_get_buffer
media: pci: cx88: Change the type of 'missed' to u64
...
Diffstat (limited to 'drivers/media/platform/coda/coda-mpeg2.c')
-rw-r--r-- | drivers/media/platform/coda/coda-mpeg2.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/media/platform/coda/coda-mpeg2.c b/drivers/media/platform/coda/coda-mpeg2.c new file mode 100644 index 000000000000..6f3f6721d286 --- /dev/null +++ b/drivers/media/platform/coda/coda-mpeg2.c @@ -0,0 +1,87 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Coda multi-standard codec IP - MPEG-2 helper functions + * + * Copyright (C) 2019 Pengutronix, Philipp Zabel + */ + +#include <linux/kernel.h> +#include <linux/videodev2.h> +#include "coda.h" + +int coda_mpeg2_profile(int profile_idc) +{ + switch (profile_idc) { + case 5: + return V4L2_MPEG_VIDEO_MPEG2_PROFILE_SIMPLE; + case 4: + return V4L2_MPEG_VIDEO_MPEG2_PROFILE_MAIN; + case 3: + return V4L2_MPEG_VIDEO_MPEG2_PROFILE_SNR_SCALABLE; + case 2: + return V4L2_MPEG_VIDEO_MPEG2_PROFILE_SPATIALLY_SCALABLE; + case 1: + return V4L2_MPEG_VIDEO_MPEG2_PROFILE_HIGH; + default: + return -EINVAL; + } +} + +int coda_mpeg2_level(int level_idc) +{ + switch (level_idc) { + case 10: + return V4L2_MPEG_VIDEO_MPEG2_LEVEL_LOW; + case 8: + return V4L2_MPEG_VIDEO_MPEG2_LEVEL_MAIN; + case 6: + return V4L2_MPEG_VIDEO_MPEG2_LEVEL_HIGH_1440; + case 4: + return V4L2_MPEG_VIDEO_MPEG2_LEVEL_HIGH; + default: + return -EINVAL; + } +} + +/* + * Check if the buffer starts with the MPEG-2 sequence header (with or without + * quantization matrix) and extension header, for example: + * + * 00 00 01 b3 2d 01 e0 34 08 8b a3 81 + * 10 11 11 12 12 12 13 13 13 13 14 14 14 14 14 15 + * 15 15 15 15 15 16 16 16 16 16 16 16 17 17 17 17 + * 17 17 17 17 18 18 18 19 18 18 18 19 1a 1a 1a 1a + * 19 1b 1b 1b 1b 1b 1c 1c 1c 1c 1e 1e 1e 1f 1f 21 + * 00 00 01 b5 14 8a 00 01 00 00 + * + * or: + * + * 00 00 01 b3 08 00 40 15 ff ff e0 28 + * 00 00 01 b5 14 8a 00 01 00 00 + * + * Returns the detected header size in bytes or 0. + */ +u32 coda_mpeg2_parse_headers(struct coda_ctx *ctx, u8 *buf, u32 size) +{ + static const u8 sequence_header_start[4] = { 0x00, 0x00, 0x01, 0xb3 }; + static const union { + u8 extension_start[4]; + u8 start_code_prefix[3]; + } u = { { 0x00, 0x00, 0x01, 0xb5 } }; + + if (size < 22 || + memcmp(buf, sequence_header_start, 4) != 0) + return 0; + + if ((size == 22 || + (size >= 25 && memcmp(buf + 22, u.start_code_prefix, 3) == 0)) && + memcmp(buf + 12, u.extension_start, 4) == 0) + return 22; + + if ((size == 86 || + (size > 89 && memcmp(buf + 86, u.start_code_prefix, 3) == 0)) && + memcmp(buf + 76, u.extension_start, 4) == 0) + return 86; + + return 0; +} |