[FFmpeg-devel] [PATCH] added support for hardware assist H264 video encoding for the Raspberry Pi

Amancio Hasty ahasty at gmail.com
Tue Apr 5 21:00:26 CEST 2016


> On Mar 31, 2016, at 7:27 PM, Amancio Hasty <ahasty at gmail.com> wrote:
> 
> I am not a lawyer…
> 
> 
> I updated the patch.  vc264.c now has a the copyright notice embedded in 
> a volatile global so if a binary is compiled against vc264.o , the copyright notice
> can be displayed by:
> strings ffmpeg | grep -i copyright
> 
> LICENSE.md has been updated to include Broadcom’s copyright notice.
> 
> A distribution of a  binary that includes vc264.o should include LICENSE.md and if 
> that is missing,  the copyright notice can be displayed via the shell
> command ‘strings’ .
> 
> Amancio
> <c-0001-added-support-for-hardware-assist-H264-video-encodin.patch>
>> On Mar 22, 2016, at 12:12 PM, Lou Logan <lou at lrcd.com> wrote:
>> 
>> On Mon, 21 Mar 2016 20:07:01 -0700, Amancio Hasty wrote:
>> 
>>> From 874a72eec2a78f4935fea091003e534b5f8d5413 Mon Sep 17 00:00:00 2001
>>> From: Amancio Hasty <ahasty at gmail.com>
>>> Date: Mon, 21 Mar 2016 18:56:05 -0700
>>> Subject: [PATCH] added support for hardware assist H264  video encoding for
>>> the Raspberry Pi
>>> 
>>> ---
>>> configure              |  12 ++
>>> libavcodec/Makefile    |   1 +
>>> libavcodec/allcodecs.c |   2 +
>>> libavcodec/vc264.c     | 387 +++++++++++++++++++++++++++++++++++++++++++++++++
>>> 4 files changed, 402 insertions(+)
>>> create mode 100644 libavcodec/vc264.c
>>> 
>> [...]
>>> diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
>>> index 2a25d66..3c7bd9b 100644
>>> --- a/libavcodec/allcodecs.c
>>> +++ b/libavcodec/allcodecs.c
>>> @@ -74,6 +74,7 @@ void avcodec_register_all(void)
>>>    initialized = 1;
>>> 
>> 
>> Nit: Whitespace on the line above should be removed.
>> 
>> [...]
>>> --- /dev/null
>>> +++ b/libavcodec/vc264.c
>>> @@ -0,0 +1,387 @@
>>> +/*  H.264 hardware assist video encoding code taken from
>>> + * raspberry's os :
>>> + *   /opt/vc/src/hello_pi/hello_encode/encode.c
>>> + */
>>> +
>>> +/*
>>> +Copyright (c) 2012, Broadcom Europe Ltd
>>> +Copyright (c) 2012, Kalle Vahlman <zuh at iki>
>>> +                    Tuomas Kulve <tuomas at kulve.fi>
>>> +All rights reserved.
>>> +
>>> +Redistribution and use in source and binary forms, with or without
>>> +modification, are permitted provided that the following conditions are met:
>>> +* Redistributions of source code must retain the above copyright
>>> +      notice, this list of conditions and the following disclaimer.
>>> +      * Redistributions in binary form must reproduce the above copyright
>>> +      notice, this list of conditions and the following disclaimer in the
>>> +      documentation and/or other materials provided with the distribution.
>>> +      * Neither the name of the copyright holder nor the
>>> +      names of its contributors may be used to endorse or promote products
>>> +      derived from this software without specific prior written permission.
>>> +
>>> +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
>>> +ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
>>> +WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
>>> +DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
>>> +DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
>>> +(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
>>> +LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
>>> +ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
>>> +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
>>> +SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>> 
>> I wonder if any of the above legalese is compatible. Granted, I see a
>> similar paragraph in "libavformat/aadec.c".
>> 
>>> + * ffmpeg driver for hardware assist video H.264 encoding using Broadcom's GPU
>>> + * Copyright (C) 2016 Amancio Hasty ahasty at gmail.com
>>> + *
>>> + *
>>> + * 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
>>> + *
>>> + */
>>> +
>>> +
>>> +/**
>>> + * @ file vc264.c
>>> + * Broadcom bm2865's Visual Core hardware assist h264 using
>>> +   openMax interface to the GPU.
>>> +
>>> +*/
>>> +
>>> +#include <stdio.h>
>>> +#include <stdlib.h>
>>> +#include <string.h>
>>> +#define OMX_SKIP64BIT
>>> +#include "bcm_host.h"
>>> +#include "ilclient.h"
>>> +#include "avcodec.h"
>>> +#include "internal.h"
>>> +
>>> +typedef struct VC264Context {
>>> +  OMX_VIDEO_PARAM_PORTFORMATTYPE format;
>>> +  OMX_PARAM_PORTDEFINITIONTYPE def;
>>> +  COMPONENT_T *video_encode;
>>> +  COMPONENT_T *list[5];
>>> +  OMX_BUFFERHEADERTYPE *buf;
>>> +  OMX_BUFFERHEADERTYPE *out;
>>> +  ILCLIENT_T *client;
>>> +  OMX_VIDEO_PARAM_BITRATETYPE bitrateType;
>>> +  int  width;
>>> +  int height;
>>> +  int bit_rate;
>>> +} VC264Context;
>>> +
>>> +
>>> +static int vc264_init(AVCodecContext *avctx) {
>>> +
>>> +
>>> +
>>> +   OMX_ERRORTYPE r;
>>> +   int error;
>>> +
>>> +
>>> +
>>> +   VC264Context *vc = avctx->priv_data;
>>> +
>>> +   vc->width = avctx->width;
>>> +   vc->height = avctx->height;
>>> +   vc->bit_rate = avctx->bit_rate;
>>> +   printf("vc264: bit rate %d \n", avctx->bit_rate);
>>> +#if FF_API_CODED_FRAME
>>> +FF_DISABLE_DEPRECATION_WARNINGS
>>> +
>>> +   avctx->coded_frame = av_frame_alloc();
>>> +   avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
>>> +FF_ENABLE_DEPRECATION_WARNINGS
>>> +#endif
>>> +
>>> +
>>> +   memset(&vc->list, 0, sizeof(vc->list));
>>> +   bcm_host_init();
>>> +   if ((vc->client = ilclient_init()) == NULL) {
>>> +      return -3;
>>> +   }
>>> +   error = OMX_Init();
>>> +
>>> +   if (error  != OMX_ErrorNone) {
>>> +      ilclient_destroy(vc->client);
>>> +      av_log(avctx,AV_LOG_ERROR,"in vc264_init OMX_Init failed ");
>>> +     return -4;
>>> +    }
>>> +
>>> +   // create video_encode
>>> +   r = ilclient_create_component(vc->client, &vc->video_encode, (char *) "video_encode",
>>> +				 ILCLIENT_DISABLE_ALL_PORTS |
>>> +				 ILCLIENT_ENABLE_INPUT_BUFFERS |
>>> +				 ILCLIENT_ENABLE_OUTPUT_BUFFERS);
>> 
>> Tabs should be converted to spaces. There are many instances of tabs
>> being used in this patch.
>> 
>> Others will have to provide a more technical review (not to mention
>> possible additions docs, Changelog, MAINTAINERS, and
>> libavcodec/version.h).
>> _______________________________________________
>> ffmpeg-devel mailing list
>> ffmpeg-devel at ffmpeg.org
>> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> 

Well, ffmpeg is very popular in the Raspberry community. For example, motionpie uses it for 
video monitoring;however, the encoding is done in software which limits its performance.

So yes quite  a  bit number of users are waiting for hardware assist H264 encoding in ffmpeg.

Thank You,
Amancio






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