/**
 * xrdp: A Remote Desktop Protocol server.
 *
 * Copyright (C) Laxmikant Rashinkar 2004-2014
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Encoder
 */

#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif

#include "xrdp_encoder.h"
#include "xrdp.h"
#include "thread_calls.h"
#include "fifo.h"

#ifdef XRDP_RFXCODEC
#include "rfxcodec_encode.h"
#endif

#define LLOG_LEVEL 1
#define LLOGLN(_level, _args) \
  do \
  { \
    if (_level < LLOG_LEVEL) \
    { \
        g_write("xrdp:xrdp_encoder [%10.10u]: ", g_time3()); \
        g_writeln _args ; \
    } \
  } \
  while (0)

#define XRDP_SURCMD_PREFIX_BYTES 256

/*****************************************************************************/
static int
process_enc_jpg(struct xrdp_encoder *self, XRDP_ENC_DATA *enc);
#ifdef XRDP_RFXCODEC
static int
process_enc_rfx(struct xrdp_encoder *self, XRDP_ENC_DATA *enc);
#endif
static int
process_enc_h264(struct xrdp_encoder *self, XRDP_ENC_DATA *enc);

/*****************************************************************************/
struct xrdp_encoder *APP_CC
xrdp_encoder_create(struct xrdp_mm *mm)
{
    struct xrdp_encoder *self;
    struct xrdp_client_info *client_info;
    char buf[1024];
    int pid;

    client_info = mm->wm->client_info;

    if (client_info->mcs_connection_type != 6) /* LAN */
    {
        return 0;
    }
    if (client_info->bpp < 24)
    {
        return 0;
    }

    self = (struct xrdp_encoder *)g_malloc(sizeof(struct xrdp_encoder), 1);
    self->mm = mm;

    if (client_info->jpeg_codec_id != 0)
    {
        LLOGLN(0, ("xrdp_encoder_create: starting jpeg codec session"));
        self->codec_id = client_info->jpeg_codec_id;
        self->in_codec_mode = 1;
        self->codec_quality = client_info->jpeg_prop[0];
        client_info->capture_code = 0;
        client_info->capture_format =
            /* XRDP_a8b8g8r8 */
            (32 << 24) | (3 << 16) | (8 << 12) | (8 << 8) | (8 << 4) | 8;
        self->process_enc = process_enc_jpg;
    }
#ifdef XRDP_RFXCODEC
    else if (client_info->rfx_codec_id != 0)
    {
        LLOGLN(0, ("xrdp_encoder_create: starting rfx codec session"));
        self->codec_id = client_info->rfx_codec_id;
        self->in_codec_mode = 1;
        client_info->capture_code = 2;
        self->process_enc = process_enc_rfx;
        self->codec_handle = rfxcodec_encode_create(mm->wm->screen->width,
                                                    mm->wm->screen->height,
                                                    RFX_FORMAT_YUV, 0);
    }
#endif
    else if (client_info->h264_codec_id != 0)
    {
        LLOGLN(0, ("xrdp_encoder_create: starting h264 codec session"));
        self->codec_id = client_info->h264_codec_id;
        self->in_codec_mode = 1;
        client_info->capture_code = 3;
        client_info->capture_format =
            /* XRDP_nv12 */
            (12 << 24) | (64 << 16) | (0 << 12) | (0 << 8) | (0 << 4) | 0;
        self->process_enc = process_enc_h264;
    }
    else
    {
        g_free(self);
        return 0;
    }

    LLOGLN(0, ("init_xrdp_encoder: initializing encoder codec_id %d", self->codec_id));

    /* setup required FIFOs */
    self->fifo_to_proc = fifo_create();
    self->fifo_processed = fifo_create();
    self->mutex = tc_mutex_create();

    pid = g_getpid();
    /* setup wait objects for signalling */
    g_snprintf(buf, 1024, "xrdp_%8.8x_encoder_event_to_proc", pid);
    self->xrdp_encoder_event_to_proc = g_create_wait_obj(buf);
    g_snprintf(buf, 1024, "xrdp_%8.8x_encoder_event_processed", pid);
    self->xrdp_encoder_event_processed = g_create_wait_obj(buf);
    g_snprintf(buf, 1024, "xrdp_%8.8x_encoder_term", pid);
    self->xrdp_encoder_term = g_create_wait_obj(buf);
    self->max_compressed_bytes = client_info->max_fastpath_frag_bytes & ~15;
    self->frames_in_flight = client_info->max_unacknowledged_frame_count;
    /* make sure frames_in_flight is at least 1 */
    self->frames_in_flight = MAX(self->frames_in_flight, 1);

    /* create thread to process messages */
    tc_thread_create(proc_enc_msg, self);

    return self;
}

/*****************************************************************************/
void APP_CC
xrdp_encoder_delete(struct xrdp_encoder *self)
{
    XRDP_ENC_DATA *enc;
    XRDP_ENC_DATA_DONE *enc_done;
    FIFO *fifo;

    LLOGLN(0, ("xrdp_encoder_delete:"));
    if (self == 0)
    {
        return;
    }
    if (self->in_codec_mode == 0)
    {
        return;
    }
    /* tell worker thread to shut down */
    g_set_wait_obj(self->xrdp_encoder_term);
    g_sleep(1000);

    /* todo delete specific encoder */

    /* destroy wait objects used for signalling */
    g_delete_wait_obj(self->xrdp_encoder_event_to_proc);
    g_delete_wait_obj(self->xrdp_encoder_event_processed);
    g_delete_wait_obj(self->xrdp_encoder_term);

    /* cleanup fifo_to_proc */
    fifo = self->fifo_to_proc;
    if (fifo)
    {
        while (!fifo_is_empty(fifo))
        {
            enc = (XRDP_ENC_DATA *) fifo_remove_item(fifo);
            if (enc == 0)
            {
                continue;
            }
            g_free(enc->drects);
            g_free(enc->crects);
            g_free(enc);
        }
        fifo_delete(fifo);
    }

    /* cleanup fifo_processed */
    fifo = self->fifo_processed;
    if (fifo)
    {
        while (!fifo_is_empty(fifo))
        {
            enc_done = (XRDP_ENC_DATA_DONE *) fifo_remove_item(fifo);
            if (enc_done == 0)
            {
                continue;
            }
            g_free(enc_done->comp_pad_data);
            g_free(enc_done);
        }
        fifo_delete(fifo);
    }
    g_free(self);
}

/*****************************************************************************/
/* called from encoder thread */
static int
process_enc_jpg(struct xrdp_encoder *self, XRDP_ENC_DATA *enc)
{
    int index;
    int x;
    int y;
    int cx;
    int cy;
    int quality;
    int error;
    int out_data_bytes;
    int count;
    char *out_data;
    XRDP_ENC_DATA_DONE *enc_done;
    FIFO *fifo_processed;
    tbus mutex;
    tbus event_processed;

    LLOGLN(10, ("process_enc_jpg:"));
    quality = self->codec_quality;
    fifo_processed = self->fifo_processed;
    mutex = self->mutex;
    event_processed = self->xrdp_encoder_event_processed;
    count = enc->num_crects;
    for (index = 0; index < count; index++)
    {
        x = enc->crects[index * 4 + 0];
        y = enc->crects[index * 4 + 1];
        cx = enc->crects[index * 4 + 2];
        cy = enc->crects[index * 4 + 3];
        if (cx < 1 || cy < 1)
        {
            LLOGLN(0, ("process_enc_jpg: error 1"));
            continue;
        }

        LLOGLN(10, ("process_enc_jpg: x %d y %d cx %d cy %d", x, y, cx, cy));

        out_data_bytes = MAX((cx + 4) * cy * 4, 8192);
        if ((out_data_bytes < 1) || (out_data_bytes > 16 * 1024 * 1024))
        {
            LLOGLN(0, ("process_enc_jpg: error 2"));
            return 1;
        }
        out_data = (char *) g_malloc(out_data_bytes + 256 + 2, 0);
        if (out_data == 0)
        {
            LLOGLN(0, ("process_enc_jpg: error 3"));
            return 1;
        }

        out_data[256] = 0; /* header bytes */
        out_data[257] = 0;
        error = libxrdp_codec_jpeg_compress(self->mm->wm->session, 0, enc->data,
                                            enc->width, enc->height,
                                            enc->width * 4, x, y, cx, cy,
                                            quality,
                                            out_data + 256 + 2, &out_data_bytes);
        if (error < 0)
        {
            LLOGLN(0, ("process_enc_jpg: jpeg error %d bytes %d",
                   error, out_data_bytes));
            g_free(out_data);
            return 1;
        }
        LLOGLN(10, ("jpeg error %d bytes %d", error, out_data_bytes));
        enc_done = (XRDP_ENC_DATA_DONE *)
                   g_malloc(sizeof(XRDP_ENC_DATA_DONE), 1);
        enc_done->comp_bytes = out_data_bytes + 2;
        enc_done->pad_bytes = 256;
        enc_done->comp_pad_data = out_data;
        enc_done->enc = enc;
        enc_done->last = index == (enc->num_crects - 1);
        enc_done->x = x;
        enc_done->y = y;
        enc_done->cx = cx;
        enc_done->cy = cy;
        /* done with msg */
        /* inform main thread done */
        tc_mutex_lock(mutex);
        fifo_add_item(fifo_processed, enc_done);
        tc_mutex_unlock(mutex);
        /* signal completion for main thread */
        g_set_wait_obj(event_processed);
    }
    return 0;
}

#ifdef XRDP_RFXCODEC
/*****************************************************************************/
/* called from encoder thread */
static int
process_enc_rfx(struct xrdp_encoder *self, XRDP_ENC_DATA *enc)
{
    int index;
    int x;
    int y;
    int cx;
    int cy;
    int out_data_bytes;
    int count;
    int error;
    char *out_data;
    XRDP_ENC_DATA_DONE *enc_done;
    FIFO *fifo_processed;
    tbus mutex;
    tbus event_processed;
    struct rfx_tile *tiles;
    struct rfx_rect *rfxrects;
    int alloc_bytes;

    LLOGLN(10, ("process_enc_rfx:"));
    LLOGLN(10, ("process_enc_rfx: num_crects %d num_drects %d",
           enc->num_crects, enc->num_drects));
    fifo_processed = self->fifo_processed;
    mutex = self->mutex;
    event_processed = self->xrdp_encoder_event_processed;

    error = 1;
    out_data = NULL;
    out_data_bytes = 0;

    if ((enc->num_crects > 0) && (enc->num_drects > 0))
    {
        alloc_bytes = XRDP_SURCMD_PREFIX_BYTES;
        alloc_bytes += self->max_compressed_bytes;
        alloc_bytes += sizeof(struct rfx_tile) * enc->num_crects +
                       sizeof(struct rfx_rect) * enc->num_drects;
        out_data = g_new(char, alloc_bytes);
        if (out_data != NULL)
        {
            tiles = (struct rfx_tile *)
                    (out_data + XRDP_SURCMD_PREFIX_BYTES +
                     self->max_compressed_bytes);
            rfxrects = (struct rfx_rect *) (tiles + enc->num_crects);

            count = enc->num_crects;
            for (index = 0; index < count; index++)
            {
                x = enc->crects[index * 4 + 0];
                y = enc->crects[index * 4 + 1];
                cx = enc->crects[index * 4 + 2];
                cy = enc->crects[index * 4 + 3];
                tiles[index].x = x;
                tiles[index].y = y;
                tiles[index].cx = cx;
                tiles[index].cy = cy;
                tiles[index].quant_y = 0;
                tiles[index].quant_cb = 0;
                tiles[index].quant_cr = 0;
            }

            count = enc->num_drects;
            for (index = 0; index < count; index++)
            {
                x = enc->drects[index * 4 + 0];
                y = enc->drects[index * 4 + 1];
                cx = enc->drects[index * 4 + 2];
                cy = enc->drects[index * 4 + 3];
                rfxrects[index].x = x;
                rfxrects[index].y = y;
                rfxrects[index].cx = cx;
                rfxrects[index].cy = cy;
            }

            out_data_bytes = self->max_compressed_bytes;
            error = rfxcodec_encode(self->codec_handle,
                                    out_data + XRDP_SURCMD_PREFIX_BYTES,
                                    &out_data_bytes, enc->data,
                                    enc->width, enc->height, enc->width * 4,
                                    rfxrects, enc->num_drects,
                                    tiles, enc->num_crects, 0, 0);
        }
    }

    LLOGLN(10, ("process_enc_rfx: rfxcodec_encode rv %d", error));
    /* only if enc_done->comp_bytes is not zero is something sent
       to the client but you must always send something back even
       on error so Xorg can get ack */
    enc_done = g_new0(XRDP_ENC_DATA_DONE, 1);
    if (enc_done == NULL)
    {
        return 1;
    }
    enc_done->comp_bytes = error == 0 ? out_data_bytes : 0;
    enc_done->pad_bytes = XRDP_SURCMD_PREFIX_BYTES;
    enc_done->comp_pad_data = out_data;
    enc_done->enc = enc;
    enc_done->last = 1;
    enc_done->cx = self->mm->wm->screen->width;
    enc_done->cy = self->mm->wm->screen->height;

    /* done with msg */
    /* inform main thread done */
    tc_mutex_lock(mutex);
    fifo_add_item(fifo_processed, enc_done);
    tc_mutex_unlock(mutex);
    /* signal completion for main thread */
    g_set_wait_obj(event_processed);

    return 0;
}
#endif

/*****************************************************************************/
/* called from encoder thread */
static int
process_enc_h264(struct xrdp_encoder *self, XRDP_ENC_DATA *enc)
{
    LLOGLN(0, ("process_enc_x264:"));
    return 0;
}

/**
 * Encoder thread main loop
 *****************************************************************************/
THREAD_RV THREAD_CC
proc_enc_msg(void *arg)
{
    XRDP_ENC_DATA *enc;
    FIFO *fifo_to_proc;
    tbus mutex;
    tbus event_to_proc;
    tbus term_obj;
    tbus lterm_obj;
    int robjs_count;
    int wobjs_count;
    int cont;
    int timeout;
    tbus robjs[32];
    tbus wobjs[32];
    struct xrdp_encoder *self;

    LLOGLN(0, ("proc_enc_msg: thread is running"));

    self = (struct xrdp_encoder *) arg;
    if (self == 0)
    {
        LLOGLN(0, ("proc_enc_msg: self nil"));
        return 0;
    }

    fifo_to_proc = self->fifo_to_proc;
    mutex = self->mutex;
    event_to_proc = self->xrdp_encoder_event_to_proc;

    term_obj = g_get_term_event();
    lterm_obj = self->xrdp_encoder_term;

    cont = 1;
    while (cont)
    {
        timeout = -1;
        robjs_count = 0;
        wobjs_count = 0;
        robjs[robjs_count++] = term_obj;
        robjs[robjs_count++] = lterm_obj;
        robjs[robjs_count++] = event_to_proc;

        if (g_obj_wait(robjs, robjs_count, wobjs, wobjs_count, timeout) != 0)
        {
            /* error, should not get here */
            g_sleep(100);
        }

        if (g_is_wait_obj_set(term_obj)) /* global term */
        {
            LLOGLN(0, ("proc_enc_msg: global term"));
            break;
        }

        if (g_is_wait_obj_set(lterm_obj)) /* xrdp_mm term */
        {
            LLOGLN(0, ("proc_enc_msg: xrdp_mm term"));
            break;
        }

        if (g_is_wait_obj_set(event_to_proc))
        {
            /* clear it right away */
            g_reset_wait_obj(event_to_proc);
            /* get first msg */
            tc_mutex_lock(mutex);
            enc = (XRDP_ENC_DATA *) fifo_remove_item(fifo_to_proc);
            tc_mutex_unlock(mutex);
            while (enc != 0)
            {
                /* do work */
                self->process_enc(self, enc);
                /* get next msg */
                tc_mutex_lock(mutex);
                enc = (XRDP_ENC_DATA *) fifo_remove_item(fifo_to_proc);
                tc_mutex_unlock(mutex);
            }
        }

    } /* end while (cont) */
    LLOGLN(0, ("proc_enc_msg: thread exit"));
    return 0;
}