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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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