h264_sdp.cpp

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#include "video_rxtx/h264_sdp.hpp"
 
#include <cstdint>               // for uint32_t
#include <cstdlib>               // for abort
#include <cstring>               // for strncpy
#include <exception>             // for exception
#include <iostream>
 
#include "audio/audio.h"
#include "audio/types.h"         // for audio_desc
#include "debug.h"
#include "host.h"
#include "lib_common.h"
#include "messaging.h"           // for msg_change_compress_data, free_response
#include "module.h"
#include "rtp/rtp.h"
#include "transmit.h"
#include "tv.h"
#include "ug_runtime_error.hpp"
#include "utils/sdp.h"
#include "video_codec.h"         // for is_codec_opaque
#include "video_rxtx.hpp"
 
#define DEFAULT_SDP_COMPRESSION "lavc:codec=MJPEG:safe"
#define MOD_NAME "[vrxtx/sdp] "
 
using std::cout;
using std::exception;
using std::shared_ptr;
using std::string;
 
h264_sdp_video_rxtx::h264_sdp_video_rxtx(std::map<std::string, param_u> const &params)
        : rtp_video_rxtx(params)
{
        auto opts = params.at("opts").str;
        LOG(LOG_LEVEL_WARNING) << "Warning: SDP support is experimental only. Things may be broken - feel free to report them but the support may be limited.\n";
        m_saved_addr = m_requested_receiver;
        m_saved_tx_port = params.at("tx_port").i;
        if (int ret = sdp_set_options(opts)) {
                throw ret == 1 ? 0 : 1;
        }
}
 
void h264_sdp_video_rxtx::change_address_callback(void *udata, const char *address)
{
        auto *s = static_cast<h264_sdp_video_rxtx *>(udata);
        if (s->m_saved_addr == address) {
                return;
        }
        s->m_saved_addr = address;
 
        constexpr enum module_class path_sender[] = { MODULE_CLASS_SENDER,
                                                      MODULE_CLASS_NONE };
        sdp_send_change_address_message(get_root_module(s->m_common.parent),
                                        path_sender, address);
}
 
void h264_sdp_video_rxtx::sdp_add_video(codec_t codec)
{
        const int rc = ::sdp_add_video(
            rtp_is_ipv6(m_network_device), m_saved_tx_port, codec,
            h264_sdp_video_rxtx::change_address_callback, this);
        if (rc == -2) {
                throw ug_runtime_error("[SDP] Unsupported video codec for SDP (allowed H.264 and JPEG)!\n");
        }
        if (rc != 0) {
                abort();
        }
}
 
void
h264_sdp_video_rxtx::send_frame(shared_ptr<video_frame> tx_frame) noexcept
{
        if (!is_codec_opaque(tx_frame->color_spec)) {
                if (m_sent_compress_change) {
                        return;
                }
                auto msg = (struct msg_change_compress_data *)
                        new_message(sizeof(struct msg_change_compress_data));
                msg->what = CHANGE_COMPRESS;
                strncpy(msg->config_string, DEFAULT_SDP_COMPRESSION, sizeof(msg->config_string) - 1);
 
                const char *path = "sender.compress";
                auto *resp = send_message(get_root_module(m_common.parent), path,
                                         (struct message *) msg);
                free_response(resp);
                m_sent_compress_change = true;
                return;
        }
        if (m_sdp_configured_codec == VIDEO_CODEC_NONE) {
                try {
                        sdp_add_video(tx_frame->color_spec);
                        m_sdp_configured_codec = tx_frame->color_spec;
                } catch (exception const &e) {
                        LOG(LOG_LEVEL_ERROR) << e.what();
                        exit_uv(1);
                        return;
                }
        }
 
        if (m_sdp_configured_codec != tx_frame->color_spec) {
                LOG(LOG_LEVEL_ERROR) << "[SDP] Video codec reconfiguration is not supported!\n";
                return;
        }
 
        if (m_sdp_configured_codec == H264) {
                tx_send_h264(m_tx, tx_frame.get(), m_network_device);
        } else {
                tx_send_jpeg(m_tx, tx_frame.get(), m_network_device);
        }
        if ((m_rxtx_mode & MODE_RECEIVER) ==
            0) { // send RTCP (receiver thread would otherwise do this)
                uint32_t ts = get_std_video_local_mediatime();
                time_ns_t curr_time = get_time_in_ns();
                rtp_update(m_network_device, curr_time);
                rtp_send_ctrl(m_network_device, ts, nullptr, curr_time);
 
                // receive RTCP
                struct timeval timeout;
                timeout.tv_sec = 0;
                timeout.tv_usec = 0;
                rtp_recv_r(m_network_device, &timeout, ts);
        }
}
 
static void
sdp_change_address_callback(void *udata, const char *address)
{
        const enum module_class path_sender[] = { MODULE_CLASS_AUDIO,
                                                  MODULE_CLASS_SENDER,
                                                  MODULE_CLASS_NONE };
        sdp_send_change_address_message((module *) udata, path_sender, address);
}
 
void
h264_sdp_video_rxtx::set_audio_spec(const struct audio_desc *desc,
                                    int /* audio_rx_port */, int audio_tx_port, bool ipv6)
{
        if (sdp_add_audio(ipv6, audio_tx_port,
                          desc->sample_rate,
                          desc->ch_count, desc->codec,
                          sdp_change_address_callback,
                          get_root_module(m_common.parent)) != 0) {
                MSG(ERROR, "Cannot add audio to SDP!\n");
        }
}
 
static video_rxtx *create_video_rxtx_h264_sdp(std::map<std::string, param_u> const &params)
{
        return new h264_sdp_video_rxtx(params);
}
 
static const struct video_rxtx_info h264_sdp_video_rxtx_info = {
        "RTP standard (SDP version)",
        create_video_rxtx_h264_sdp
};
 
REGISTER_MODULE(sdp, &h264_sdp_video_rxtx_info, LIBRARY_CLASS_VIDEO_RXTX, VIDEO_RXTX_ABI_VERSION);