diff options
author | Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org> | 2017-09-20 18:55:40 -0700 |
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committer | wm4 <nfxjfg@googlemail.com> | 2017-09-23 08:47:52 +0200 |
commit | 1ef7752d64cbe9af2f27cc65aba3a2ca3831c128 (patch) | |
tree | e92366f2b4d6fce0859341e6e7547c12a12b81f3 /libavcodec/v4l2_m2m.h | |
parent | afe674734bbe71ef6c32f96a98f5f84d007eea1c (diff) |
libavcodec: v4l2: add support for v4l2 mem2mem codecs
This patchset enhances Alexis Ballier's original patch and validates
it using Qualcomm's Venus hardware (driver recently landed upstream
[1]).
This has been tested on Qualcomm's DragonBoard 410c and 820c
Configure/make scripts have been validated on Ubuntu 10.04 and
16.04.
Tested decoders:
- h264
- h263
- mpeg4
- vp8
- vp9
- hevc
Tested encoders:
- h264
- h263
- mpeg4
Tested transcoding (concurrent encoding/decoding)
Some of the changes introduced:
- v4l2: code cleanup and abstractions added
- v4l2: follow the new encode/decode api.
- v4l2: fix display size for NV12 output pool.
- v4l2: handle EOS (EPIPE and draining)
- v4l2: vp8 and mpeg4 decoding and encoding.
- v4l2: hevc and vp9 support.
- v4l2: generate EOF on dequeue errors.
- v4l2: h264_mp4toannexb filtering.
- v4l2: fixed make install and fate issues.
- v4l2: codecs enabled/disabled depending on pixfmt defined
- v4l2: pass timebase/framerate to the context
- v4l2: runtime decoder reconfiguration.
- v4l2: add more frame information
- v4l2: free hardware resources on last reference being released
- v4l2: encoding: disable b-frames for upstreaming (patch required)
[1] https://lwn.net/Articles/697956/
System Level view:
v42l_m2m_enc/dec --> v4l2_m2m --> v4l2_context --> v4l2_buffers
Reviewed-by: Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
Reviewed-by: Alexis Ballier <aballier@gentoo.org>
Tested-by: Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: wm4 <nfxjfg@googlemail.com>
Diffstat (limited to 'libavcodec/v4l2_m2m.h')
-rw-r--r-- | libavcodec/v4l2_m2m.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/libavcodec/v4l2_m2m.h b/libavcodec/v4l2_m2m.h new file mode 100644 index 0000000000..13e2285389 --- /dev/null +++ b/libavcodec/v4l2_m2m.h @@ -0,0 +1,103 @@ +/* + * V4L2 mem2mem helper functions + * + * Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org> + * Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVCODEC_V4L2_M2M_H +#define AVCODEC_V4L2_M2M_H + +#include <semaphore.h> +#include <unistd.h> +#include <dirent.h> +#include "libavcodec/avcodec.h" +#include "v4l2_context.h" + +#define container_of(ptr, type, member) ({ \ + const __typeof__(((type *)0)->member ) *__mptr = (ptr); \ + (type *)((char *)__mptr - offsetof(type,member) );}) + +#define V4L_M2M_DEFAULT_OPTS \ + { "num_output_buffers", "Number of buffers in the output context",\ + OFFSET(output.num_buffers), AV_OPT_TYPE_INT, { .i64 = 16 }, 6, INT_MAX, FLAGS } + +typedef struct V4L2m2mContext +{ + AVClass *class; + char devname[PATH_MAX]; + int fd; + + /* the codec context queues */ + V4L2Context capture; + V4L2Context output; + + /* refcount of buffers held by the user */ + atomic_uint refcount; + + /* dynamic stream reconfig */ + AVCodecContext *avctx; + sem_t refsync; + int reinit; + + /* null frame/packet received */ + int draining; +} V4L2m2mContext; + +/** + * Probes the video nodes looking for the required codec capabilities. + * + * @param[in] ctx The AVCodecContext instantiated by the encoder/decoder. + * + * @returns 0 if a driver is found, a negative number otherwise. + */ +int ff_v4l2_m2m_codec_init(AVCodecContext *avctx); + +/** + * Releases all the codec resources if all AVBufferRefs have been returned to the + * ctx. Otherwise keep the driver open. + * + * @param[in] The AVCodecContext instantiated by the encoder/decoder. + * + * @returns 0 + * + */ +int ff_v4l2_m2m_codec_end(AVCodecContext *avctx); + +/** + * Reinitializes the V4L2m2mContext when the driver cant continue processing + * with the capture parameters. + * + * @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder. + * + * @returns 0 in case of success, negative number otherwise + */ +int ff_v4l2_m2m_codec_reinit(V4L2m2mContext *ctx); + +/** + * Reinitializes the V4L2m2mContext when the driver cant continue processing + * with the any of the current V4L2Contexts (ie, changes in output and capture). + * + * @param[in] ctx The V4L2m2mContext instantiated by the encoder/decoder. + * + * @returns 0 in case of success, negative number otherwise + */ +int ff_v4l2_m2m_codec_full_reinit(V4L2m2mContext *ctx); + +#endif /* AVCODEC_V4L2_M2M_H */ |