open_device()

bool MayaFlux::IO::FFmpegDemuxContext::open_device	(	const std::string &	device_name,
		const std::string &	format_name,
		AVDictionary **	options = nullptr
	)

Open an FFmpeg device input (camera, screen capture, etc.).

Calls av_find_input_format() then avformat_open_input() with the supplied options dict. avdevice_register_all() must have been called before this method.

Parameters

device_name	Platform device string (e.g. "/dev/video0").
format_name	FFmpeg input format name (e.g. "v4l2", "avfoundation").
options	AVDictionary of format options; consumed and freed on return.

Returns

True on success.

Definition at line 64 of file FFmpegDemuxContext.cpp.

{
    close();
    init_ffmpeg();
 
    const AVInputFormat* fmt = av_find_input_format(format_name.c_str());
    if (!fmt) {
        m_last_error = "av_find_input_format failed for: " + format_name;
        return false;
    }
 
    int ret = avformat_open_input(&format_context,
        device_name.c_str(), fmt, options);
    if (ret < 0) {
        char errbuf[AV_ERROR_MAX_STRING_SIZE];
        av_strerror(ret, errbuf, sizeof(errbuf));
        m_last_error = "avformat_open_input failed for device: "
            + device_name + " (" + errbuf + ")";
        return false;
    }
 
    if (avformat_find_stream_info(format_context, nullptr) < 0) {
        avformat_close_input(&format_context);
        m_last_error = "avformat_find_stream_info failed for device: " + device_name;
        return false;
    }
 
    return true;
}

References close(), format_context, init_ffmpeg(), and m_last_error.

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