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/*
Copyright (C) 2020 by Morten Bøgeskov <source@kosmisk.dk>
This program 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 program 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 program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <obs-module.h>
#include <linux/videodev2.h>
#include "v4l2-decoder.h"
#define blog(level, msg, ...) \
blog(level, "v4l2-input: decoder: " msg, ##__VA_ARGS__)
int v4l2_init_decoder(struct v4l2_decoder *decoder, int pixfmt)
{
if (pixfmt == V4L2_PIX_FMT_MJPEG) {
decoder->codec = avcodec_find_decoder(AV_CODEC_ID_MJPEG);
} else if (pixfmt == V4L2_PIX_FMT_H264) {
decoder->codec = avcodec_find_decoder(AV_CODEC_ID_H264);
}
if (!decoder->codec) {
if (pixfmt == V4L2_PIX_FMT_MJPEG) {
blog(LOG_ERROR, "failed to find MJPEG decoder");
} else if (pixfmt == V4L2_PIX_FMT_H264) {
blog(LOG_ERROR, "failed to find H264 decoder");
}
return -1;
}
decoder->context = avcodec_alloc_context3(decoder->codec);
if (!decoder->context) {
return -1;
}
decoder->packet = av_packet_alloc();
if (!decoder->packet) {
return -1;
}
decoder->frame = av_frame_alloc();
if (!decoder->frame) {
return -1;
}
decoder->context->flags2 |= AV_CODEC_FLAG2_FAST;
if (avcodec_open2(decoder->context, decoder->codec, NULL) < 0) {
blog(LOG_ERROR, "failed to open codec");
return -1;
}
blog(LOG_DEBUG, "initialized avcodec");
return 0;
}
void v4l2_destroy_decoder(struct v4l2_decoder *decoder)
{
blog(LOG_DEBUG, "destroying avcodec");
if (decoder->frame) {
av_frame_free(&decoder->frame);
}
if (decoder->packet) {
av_packet_free(&decoder->packet);
}
if (decoder->context) {
#if LIBAVCODEC_VERSION_MAJOR < 61
avcodec_close(decoder->context);
#endif
avcodec_free_context(&decoder->context);
}
}
int v4l2_decode_frame(struct obs_source_frame *out, uint8_t *data,
size_t length, struct v4l2_decoder *decoder)
{
decoder->packet->data = data;
decoder->packet->size = length;
if (avcodec_send_packet(decoder->context, decoder->packet) < 0) {
blog(LOG_ERROR, "failed to send frame to codec");
return -1;
}
if (avcodec_receive_frame(decoder->context, decoder->frame) < 0) {
blog(LOG_ERROR, "failed to receive frame from codec");
return -1;
}
for (uint_fast32_t i = 0; i < MAX_AV_PLANES; ++i) {
out->data[i] = decoder->frame->data[i];
out->linesize[i] = decoder->frame->linesize[i];
}
switch (decoder->context->pix_fmt) {
case AV_PIX_FMT_GRAY8:
out->format = VIDEO_FORMAT_Y800;
break;
case AV_PIX_FMT_YUVJ422P:
case AV_PIX_FMT_YUV422P:
out->format = VIDEO_FORMAT_I422;
break;
case AV_PIX_FMT_YUVJ420P:
case AV_PIX_FMT_YUV420P:
out->format = VIDEO_FORMAT_I420;
break;
case AV_PIX_FMT_YUVJ444P:
case AV_PIX_FMT_YUV444P:
out->format = VIDEO_FORMAT_I444;
break;
default:
break;
}
return 0;
}
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