/**
 * RPiPlay - An open-source AirPlay mirroring server for Raspberry Pi
 * Copyright (C) 2019 Florian Draschbacher
 *
 * 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 3 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, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
 */

#include "audio_renderer.h"
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include <math.h>
#include <gst/app/gstappsrc.h>

struct audio_renderer_s {
    logger_t *logger;
    GstElement *appsrc; 
    GstElement *pipeline;
    GstElement *volume;
};

audio_renderer_t *audio_renderer_init(logger_t *logger, video_renderer_t *video_renderer, audio_device_t device, bool low_latency) {
    audio_renderer_t *renderer;
    GError *error = NULL;

    renderer = calloc(1, sizeof(audio_renderer_t));
    if (!renderer) {
        return NULL;
    }
    renderer->logger = logger;

    renderer->pipeline = gst_parse_launch("appsrc name=audio_source stream-type=0 format=GST_FORMAT_TIME is-live=true ! queue ! decodebin !"
    "audioconvert ! volume name=volume ! level ! autoaudiosink sync=false", &error);
    g_assert (renderer->pipeline);

    renderer->appsrc = gst_bin_get_by_name (GST_BIN (renderer->pipeline), "audio_source");
    renderer->volume = gst_bin_get_by_name (GST_BIN (renderer->pipeline), "volume");
    
    gchar eld_conf[] = { 0xF8, 0xE8, 0x50, 0x00 };
    GstBuffer *codec_data = gst_buffer_new_and_alloc(sizeof(eld_conf));
    GstMapInfo map;

    gst_buffer_map (codec_data, &map, GST_MAP_WRITE); 
    memset (map.data, eld_conf[0], map.size);
    memset (map.data+1, eld_conf[1], map.size);
    memset (map.data+2, eld_conf[2], map.size);
    memset (map.data+3, eld_conf[3], map.size);

    GstCaps *caps = gst_caps_new_simple ("audio/mpeg",
    "rate", G_TYPE_INT, 44100,
    "channels", G_TYPE_INT, 2,
    "mpegversion", G_TYPE_INT, 4,
    "stream-format", G_TYPE_STRING, "raw",
    "codec_data", GST_TYPE_BUFFER, codec_data,
    NULL);
    g_object_set(renderer->appsrc, "caps", caps, NULL);

    gst_caps_unref(caps);
    gst_buffer_unmap (codec_data, &map);
    gst_buffer_unref (codec_data);

    return renderer;
}

void audio_renderer_start(audio_renderer_t *renderer) {
    //g_signal_connect( renderer->pipeline, "deep-notify", G_CALLBACK(gst_object_default_deep_notify ), NULL );
    gst_element_set_state (renderer->pipeline, GST_STATE_PLAYING);
}

void audio_renderer_render_buffer(audio_renderer_t *renderer, raop_ntp_t *ntp, unsigned char* data, int data_len, uint64_t pts) {

    GstBuffer *buffer;

    if (data_len == 0) return;

    buffer = gst_buffer_new_and_alloc(data_len);
    assert(buffer != NULL);
    GST_BUFFER_DTS(buffer) = (GstClockTime)pts;
    gst_buffer_fill(buffer, 0, data, data_len);
    gst_app_src_push_buffer(GST_APP_SRC(renderer->appsrc), buffer);

}

void audio_renderer_set_volume(audio_renderer_t *renderer, float volume) {
    float avol;
        if (fabs(volume) < 28) {
	        avol=floorf(((28-fabs(volume))/28)*10)/10;
    	    g_object_set(renderer->volume, "volume", avol, NULL);
        }
}

void audio_renderer_flush(audio_renderer_t *renderer) {
}

void audio_renderer_destroy(audio_renderer_t *renderer) {

    gst_app_src_end_of_stream (GST_APP_SRC(renderer->appsrc));
    gst_element_set_state (renderer->pipeline, GST_STATE_NULL);
    gst_object_unref (renderer->pipeline);
    gst_object_unref (renderer->appsrc);
    gst_object_unref (renderer->volume);
    if (renderer) {
        free(renderer);
    }
}