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/* Copyright (C) 2021 Vladimir Sukhonosov <xornet@xornet.org>
* Copyright (C) 2021 Martins Mozeiko <martins.mozeiko@gmail.com>
* All Rights Reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
extern "C" {
#include <libavutil/imgutils.h>
#include <libavcodec/version.h>
}
#if LIBAVCODEC_VERSION_MAJOR > 57 || LIBAVCODEC_VERSION_MAJOR == 57 && LIBAVCODEC_VERSION_MINOR >= 37
#define FFMPEG_DECODE_VIDEO2_DEPRECATED
#endif
#if LIBAVCODEC_VERSION_MAJOR >= 58
#define FFMPEG_INIT_PACKET_DEPRECATED
#endif
#include <rfb/Exception.h>
#include <rfb/LogWriter.h>
#include <rfb/PixelBuffer.h>
#include <rfb/H264LibavDecoderContext.h>
using namespace rfb;
static LogWriter vlog("H264LibavDecoderContext");
bool H264LibavDecoderContext::initCodec() {
os::AutoMutex lock(&mutex);
sws = nullptr;
h264WorkBuffer = nullptr;
h264WorkBufferLength = 0;
const AVCodec *codec = avcodec_find_decoder(AV_CODEC_ID_H264);
if (!codec)
{
vlog.error("Codec not found");
return false;
}
parser = av_parser_init(codec->id);
if (!parser)
{
vlog.error("Could not create H264 parser");
return false;
}
avctx = avcodec_alloc_context3(codec);
if (!avctx)
{
av_parser_close(parser);
vlog.error("Could not allocate video codec context");
return false;
}
frame = av_frame_alloc();
if (!frame)
{
av_parser_close(parser);
avcodec_free_context(&avctx);
vlog.error("Could not allocate video frame");
return false;
}
if (avcodec_open2(avctx, codec, nullptr) < 0)
{
av_parser_close(parser);
avcodec_free_context(&avctx);
av_frame_free(&frame);
vlog.error("Could not open codec");
return false;
}
initialized = true;
return true;
}
void H264LibavDecoderContext::freeCodec() {
os::AutoMutex lock(&mutex);
if (!initialized)
return;
av_parser_close(parser);
avcodec_free_context(&avctx);
av_frame_free(&rgbFrame);
av_frame_free(&frame);
sws_freeContext(sws);
free(h264WorkBuffer);
initialized = false;
}
// We need to reallocate buffer because AVPacket uses non-const pointer.
// We don't want to const_cast our buffer somewhere. So we would rather to maintain context's own buffer
// Also avcodec requires a right padded buffer
uint8_t* H264LibavDecoderContext::makeH264WorkBuffer(const uint8_t* buffer, uint32_t len)
{
uint32_t reserve_len = len + len % AV_INPUT_BUFFER_PADDING_SIZE;
if (!h264WorkBuffer || reserve_len > h264WorkBufferLength)
{
h264WorkBuffer = (uint8_t*)realloc(h264WorkBuffer, reserve_len);
if (h264WorkBuffer == nullptr) {
throw Exception("H264LibavDecoderContext: Unable to allocate memory");
}
h264WorkBufferLength = reserve_len;
}
memcpy(h264WorkBuffer, buffer, len);
memset(h264WorkBuffer + len, 0, h264WorkBufferLength - len);
return h264WorkBuffer;
}
void H264LibavDecoderContext::decode(const uint8_t* h264_in_buffer,
uint32_t len,
ModifiablePixelBuffer* pb) {
os::AutoMutex lock(&mutex);
if (!initialized)
return;
uint8_t* h264_work_buffer = makeH264WorkBuffer(h264_in_buffer, len);
#ifdef FFMPEG_INIT_PACKET_DEPRECATED
AVPacket *packet = av_packet_alloc();
#else
AVPacket *packet = new AVPacket();
av_init_packet(packet);
#endif
int ret;
int frames_received = 0;
while (len)
{
ret = av_parser_parse2(parser, avctx, &packet->data, &packet->size, h264_work_buffer, len, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
if (ret < 0)
{
vlog.error("Error while parsing");
break;
}
// We need to slap on tv to make it work here (don't ask me why)
if (!packet->size && len == static_cast<uint32_t>(ret))
ret = av_parser_parse2(parser, avctx, &packet->data, &packet->size, h264_work_buffer, len, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
if (ret < 0)
{
vlog.error("Error while parsing");
break;
}
h264_work_buffer += ret;
len -= ret;
if (!ret)
{
packet->size = len;
packet->data = h264_work_buffer;
len = 0;
}
if (!packet->size)
continue;
#ifndef FFMPEG_DECODE_VIDEO2_DEPRECATED
int got_frame;
ret = avcodec_decode_video2(avctx, frame, &got_frame, packet);
if (ret < 0 || !got_frame)
{
vlog.error("Error during decoding");
break;
}
#else
ret = avcodec_send_packet(avctx, packet);
if (ret < 0)
{
vlog.error("Error sending a packet to decoding");
break;
}
ret = avcodec_receive_frame(avctx, frame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
break;
else if (ret < 0)
{
vlog.error("Error during decoding");
break;
}
#endif
frames_received++;
}
#ifdef FFMPEG_INIT_PACKET_DEPRECATED
packet->size = 0;
packet->data = nullptr;
av_packet_free(&packet);
#else
delete packet;
#endif
if (!frames_received)
return;
if (!frame->height)
return;
sws = sws_getCachedContext(sws, frame->width, frame->height, avctx->pix_fmt,
frame->width, frame->height, AV_PIX_FMT_RGB32,
SWS_POINT, nullptr, nullptr, nullptr);
int inFull, outFull, brightness, contrast, saturation;
const int* inTable;
const int* outTable;
sws_getColorspaceDetails(sws, (int**)&inTable, &inFull, (int**)&outTable,
&outFull, &brightness, &contrast, &saturation);
if (frame->colorspace != AVCOL_SPC_UNSPECIFIED) {
inTable = sws_getCoefficients(frame->colorspace);
}
if (frame->color_range != AVCOL_RANGE_UNSPECIFIED) {
inFull = frame->color_range == AVCOL_RANGE_JPEG;
}
sws_setColorspaceDetails(sws, inTable, inFull, outTable, outFull, brightness,
contrast, saturation);
if (rgbFrame && (rgbFrame->width != frame->width || rgbFrame->height != frame->height)) {
av_frame_free(&rgbFrame);
}
if (!rgbFrame) {
rgbFrame = av_frame_alloc();
// TODO: Can we really assume that the pixel format will always be RGB32?
rgbFrame->format = AV_PIX_FMT_RGB32;
rgbFrame->width = frame->width;
rgbFrame->height = frame->height;
av_frame_get_buffer(rgbFrame, 0);
}
sws_scale(sws, frame->data, frame->linesize, 0, frame->height, rgbFrame->data,
rgbFrame->linesize);
pb->imageRect(rect, rgbFrame->data[0], rgbFrame->linesize[0] / 4);
}
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