/*****************************************************************************
 * muxers.c: h264 file i/o plugins
 *****************************************************************************
 * Copyright (C) 2003-2006 x264 project
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

#include <sys/types.h>

#include "common/common.h"
#include "x264.h"
#include "matroska.h"
#include "muxers.h"

#ifndef _MSC_VER
#include "config.h"
#endif

#ifdef AVIS_INPUT
#include <windows.h>
#include <vfw.h>
#endif

#ifdef MP4_OUTPUT
#include <gpac/isomedia.h>
#endif

static int64_t gcd( int64_t a, int64_t b )
{
    while (1)
    {
        int64_t c = a % b;
        if( !c )
            return b;
        a = b;
        b = c;
    }
}

typedef struct {
    FILE *fh;
    int width, height;
    int next_frame;
} yuv_input_t;

/* raw 420 yuv file operation */
int open_file_yuv( char *psz_filename, hnd_t *p_handle, x264_param_t *p_param )
{
    yuv_input_t *h = malloc(sizeof(yuv_input_t));
    h->width = p_param->i_width;
    h->height = p_param->i_height;
    h->next_frame = 0;

    if( !strcmp(psz_filename, "-") )
        h->fh = stdin;
    else
        h->fh = fopen(psz_filename, "rb");
    if( h->fh == NULL )
        return -1;

    *p_handle = (hnd_t)h;
    return 0;
}

int get_frame_total_yuv( hnd_t handle )
{
    yuv_input_t *h = handle;
    int i_frame_total = 0;

    if( !fseek( h->fh, 0, SEEK_END ) )
    {
        uint64_t i_size = ftell( h->fh );
        fseek( h->fh, 0, SEEK_SET );
        i_frame_total = (int)(i_size / ( h->width * h->height * 3 / 2 ));
    }

    return i_frame_total;
}

int read_frame_yuv( x264_picture_t *p_pic, hnd_t handle, int i_frame )
{
    yuv_input_t *h = handle;

    if( i_frame != h->next_frame )
        if( fseek( h->fh, (uint64_t)i_frame * h->width * h->height * 3 / 2, SEEK_SET ) )
            return -1;

    if( fread( p_pic->img.plane[0], 1, h->width * h->height, h->fh ) <= 0
            || fread( p_pic->img.plane[1], 1, h->width * h->height / 4, h->fh ) <= 0
            || fread( p_pic->img.plane[2], 1, h->width * h->height / 4, h->fh ) <= 0 )
        return -1;

    h->next_frame = i_frame+1;

    return 0;
}

int close_file_yuv(hnd_t handle)
{
    yuv_input_t *h = handle;
    if( !h || !h->fh )
        return 0;
    fclose( h->fh );
    free( h );
    return 0;
}

/* YUV4MPEG2 raw 420 yuv file operation */
typedef struct {
    FILE *fh;
    int width, height;
    int next_frame;
    int seq_header_len, frame_header_len;
    int frame_size;
} y4m_input_t;

#define Y4M_MAGIC "YUV4MPEG2"
#define MAX_YUV4_HEADER 80
#define Y4M_FRAME_MAGIC "FRAME"
#define MAX_FRAME_HEADER 80

int open_file_y4m( char *psz_filename, hnd_t *p_handle, x264_param_t *p_param )
{
    int  i, n, d;
    int  interlaced;
    char header[MAX_YUV4_HEADER+10];
    char *tokstart, *tokend, *header_end;
    y4m_input_t *h = malloc(sizeof(y4m_input_t));

    h->next_frame = 0;

    if( !strcmp(psz_filename, "-") )
        h->fh = stdin;
    else
        h->fh = fopen(psz_filename, "rb");
    if( h->fh == NULL )
        return -1;

    h->frame_header_len = strlen(Y4M_FRAME_MAGIC)+1;

    /* Read header */
    for( i=0; i<MAX_YUV4_HEADER; i++ )
    {
        header[i] = fgetc(h->fh);
        if( header[i] == '\n' )
        {
            /* Add a space after last option. Makes parsing "444" vs
               "444alpha" easier. */
            header[i+1] = 0x20;
            header[i+2] = 0;
            break;
        }
    }
    if( i == MAX_YUV4_HEADER || strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)) )
        return -1;

    /* Scan properties */
    header_end = &header[i+1]; /* Include space */
    h->seq_header_len = i+1;
    for( tokstart = &header[strlen(Y4M_MAGIC)+1]; tokstart < header_end; tokstart++ )
    {
        if(*tokstart==0x20) continue;
        switch(*tokstart++)
        {
        case 'W': /* Width. Required. */
            h->width = p_param->i_width = strtol(tokstart, &tokend, 10);
            tokstart=tokend;
            break;
        case 'H': /* Height. Required. */
            h->height = p_param->i_height = strtol(tokstart, &tokend, 10);
            tokstart=tokend;
            break;
        case 'C': /* Color space */
            if( strncmp("420", tokstart, 3) )
            {
                fprintf(stderr, "Colorspace unhandled\n");
                return -1;
            }
            tokstart = strchr(tokstart, 0x20);
            break;
        case 'I': /* Interlace type */
            switch(*tokstart++)
            {
            case 'p': interlaced = 0; break;
            case '?':
            case 't':
            case 'b':
            case 'm':
            default: interlaced = 1;
                fprintf(stderr, "Warning, this sequence might be interlaced\n");
            }
            break;
        case 'F': /* Frame rate - 0:0 if unknown */
            if( sscanf(tokstart, "%d:%d", &n, &d) == 2 && n && d )
            {
                x264_reduce_fraction( &n, &d );
                p_param->i_fps_num = n;
                p_param->i_fps_den = d;
            }
            tokstart = strchr(tokstart, 0x20);
            break;
        case 'A': /* Pixel aspect - 0:0 if unknown */
            if( sscanf(tokstart, "%d:%d", &n, &d) == 2 && n && d )
            {
                x264_reduce_fraction( &n, &d );
                p_param->vui.i_sar_width = n;
                p_param->vui.i_sar_height = d;
            }
            tokstart = strchr(tokstart, 0x20);
            break;
        case 'X': /* Vendor extensions */
            if( !strncmp("YSCSS=",tokstart,6) )
            {
                /* Older nonstandard pixel format representation */
                tokstart += 6;
                if( strncmp("420JPEG",tokstart,7) &&
                    strncmp("420MPEG2",tokstart,8) &&
                    strncmp("420PALDV",tokstart,8) )
                {
                    fprintf(stderr, "Unsupported extended colorspace\n");
                    return -1;
                }
            }
            tokstart = strchr(tokstart, 0x20);
            break;
        }
    }

    fprintf(stderr, "yuv4mpeg: %ix%i@%i/%ifps, %i:%i\n",
            h->width, h->height, p_param->i_fps_num, p_param->i_fps_den,
            p_param->vui.i_sar_width, p_param->vui.i_sar_height);

    *p_handle = (hnd_t)h;
    return 0;
}

/* Most common case: frame_header = "FRAME" */
int get_frame_total_y4m( hnd_t handle )
{
    y4m_input_t *h             = handle;
    int          i_frame_total = 0;
    uint64_t     init_pos      = ftell(h->fh);

    if( !fseek( h->fh, 0, SEEK_END ) )
    {
        uint64_t i_size = ftell( h->fh );
        fseek( h->fh, init_pos, SEEK_SET );
        i_frame_total = (int)((i_size - h->seq_header_len) /
                              (3*(h->width*h->height)/2+h->frame_header_len));
    }

    return i_frame_total;
}

int read_frame_y4m( x264_picture_t *p_pic, hnd_t handle, int i_frame )
{
    int          slen = strlen(Y4M_FRAME_MAGIC);
    int          i    = 0;
    char         header[16];
    y4m_input_t *h    = handle;

    if( i_frame != h->next_frame )
    {
        if (fseek(h->fh, (uint64_t)i_frame*(3*(h->width*h->height)/2+h->frame_header_len)
                  + h->seq_header_len, SEEK_SET))
            return -1;
    }

    /* Read frame header - without terminating '\n' */
    if (fread(header, 1, slen, h->fh) != slen)
        return -1;
    
    header[slen] = 0;
    if (strncmp(header, Y4M_FRAME_MAGIC, slen))
    {
        fprintf(stderr, "Bad header magic (%08X <=> %s)\n",
                *((uint32_t*)header), header);
        return -1;
    }
  
    /* Skip most of it */
    while (i<MAX_FRAME_HEADER && fgetc(h->fh) != '\n')
        i++;
    if (i == MAX_FRAME_HEADER)
    {
        fprintf(stderr, "Bad frame header!\n");
        return -1;
    }
    h->frame_header_len = i+slen+1;

    if( fread(p_pic->img.plane[0], 1, h->width*h->height, h->fh) <= 0
        || fread(p_pic->img.plane[1], 1, h->width * h->height / 4, h->fh) <= 0
        || fread(p_pic->img.plane[2], 1, h->width * h->height / 4, h->fh) <= 0)
        return -1;

    h->next_frame = i_frame+1;

    return 0;
}

int close_file_y4m(hnd_t handle)
{
    y4m_input_t *h = handle;
    if( !h || !h->fh )
        return 0;
    fclose( h->fh );
    free( h );
    return 0;
}

/* avs/avi input file support under cygwin */

#ifdef AVIS_INPUT
typedef struct {
    PAVISTREAM p_avi;
    int width, height;
} avis_input_t;

int open_file_avis( char *psz_filename, hnd_t *p_handle, x264_param_t *p_param )
{
    avis_input_t *h = malloc(sizeof(avis_input_t));
    AVISTREAMINFO info;
    int i;

    *p_handle = (hnd_t)h;

    AVIFileInit();
    if( AVIStreamOpenFromFile( &h->p_avi, psz_filename, streamtypeVIDEO, 0, OF_READ, NULL ) )
    {
        AVIFileExit();
        return -1;
    }

    if( AVIStreamInfo(h->p_avi, &info, sizeof(AVISTREAMINFO)) )
    {
        AVIStreamRelease(h->p_avi);
        AVIFileExit();
        return -1;
    }

    // check input format
    if (info.fccHandler != MAKEFOURCC('Y', 'V', '1', '2'))
    {
        fprintf( stderr, "avis [error]: unsupported input format (%c%c%c%c)\n",
            (char)(info.fccHandler & 0xff), (char)((info.fccHandler >> 8) & 0xff),
            (char)((info.fccHandler >> 16) & 0xff), (char)((info.fccHandler >> 24)) );

        AVIStreamRelease(h->p_avi);
        AVIFileExit();

        return -1;
    }

    h->width =
    p_param->i_width = info.rcFrame.right - info.rcFrame.left;
    h->height =
    p_param->i_height = info.rcFrame.bottom - info.rcFrame.top;
    i = gcd(info.dwRate, info.dwScale);
    p_param->i_fps_den = info.dwScale / i;
    p_param->i_fps_num = info.dwRate / i;

    fprintf( stderr, "avis [info]: %dx%d @ %.2f fps (%d frames)\n",
        p_param->i_width, p_param->i_height,
        (double)p_param->i_fps_num / (double)p_param->i_fps_den,
        (int)info.dwLength );

    return 0;
}

int get_frame_total_avis( hnd_t handle )
{
    avis_input_t *h = handle;
    AVISTREAMINFO info;

    if( AVIStreamInfo(h->p_avi, &info, sizeof(AVISTREAMINFO)) )
        return -1;

    return info.dwLength;
}

int read_frame_avis( x264_picture_t *p_pic, hnd_t handle, int i_frame )
{
    avis_input_t *h = handle;

    p_pic->img.i_csp = X264_CSP_YV12;

    if( AVIStreamRead(h->p_avi, i_frame, 1, p_pic->img.plane[0], h->width * h->height * 3 / 2, NULL, NULL ) )
        return -1;

    return 0;
}

int close_file_avis( hnd_t handle )
{
    avis_input_t *h = handle;
    AVIStreamRelease(h->p_avi);
    AVIFileExit();
    free(h);
    return 0;
}
#endif


#ifdef HAVE_PTHREAD
typedef struct {
    int (*p_read_frame)( x264_picture_t *p_pic, hnd_t handle, int i_frame );
    int (*p_close_infile)( hnd_t handle );
    hnd_t p_handle;
    x264_picture_t pic;
    pthread_t tid;
    int next_frame;
    int frame_total;
    struct thread_input_arg_t *next_args;
} thread_input_t;

typedef struct thread_input_arg_t {
    thread_input_t *h;
    x264_picture_t *pic;
    int i_frame;
    int status;
} thread_input_arg_t;

int open_file_thread( char *psz_filename, hnd_t *p_handle, x264_param_t *p_param )
{
    thread_input_t *h = malloc(sizeof(thread_input_t));
    x264_picture_alloc( &h->pic, X264_CSP_I420, p_param->i_width, p_param->i_height );
    h->p_read_frame = p_read_frame;
    h->p_close_infile = p_close_infile;
    h->p_handle = *p_handle;
    h->next_frame = -1;
    h->next_args = malloc(sizeof(thread_input_arg_t));
    h->next_args->h = h;
    h->next_args->status = 0;
    h->frame_total = p_get_frame_total( h->p_handle );

    *p_handle = (hnd_t)h;
    return 0;
}

int get_frame_total_thread( hnd_t handle )
{
    thread_input_t *h = handle;
    return h->frame_total;
}

void read_frame_thread_int( thread_input_arg_t *i )
{
    i->status = i->h->p_read_frame( i->pic, i->h->p_handle, i->i_frame );
}

int read_frame_thread( x264_picture_t *p_pic, hnd_t handle, int i_frame )
{
    thread_input_t *h = handle;
    UNUSED void *stuff;
    int ret = 0;

    if( h->next_frame >= 0 )
    {
        pthread_join( h->tid, &stuff );
        ret |= h->next_args->status;
    }

    if( h->next_frame == i_frame )
    {
        XCHG( x264_picture_t, *p_pic, h->pic );
    }
    else
    {
        ret |= h->p_read_frame( p_pic, h->p_handle, i_frame );
    }

    if( !h->frame_total || i_frame+1 < h->frame_total )
    {
        h->next_frame =
        h->next_args->i_frame = i_frame+1;
        h->next_args->pic = &h->pic;
        pthread_create( &h->tid, NULL, (void*)read_frame_thread_int, h->next_args );
    }
    else
        h->next_frame = -1;

    return ret;
}

int close_file_thread( hnd_t handle )
{
    thread_input_t *h = handle;
    h->p_close_infile( h->p_handle );
    x264_picture_clean( &h->pic );
    free( h );
    return 0;
}
#endif


int open_file_bsf( char *psz_filename, hnd_t *p_handle )
{
    if ((*p_handle = fopen(psz_filename, "w+b")) == NULL)
        return -1;

    return 0;
}

int set_param_bsf( hnd_t handle, x264_param_t *p_param )
{
    return 0;
}

int write_nalu_bsf( hnd_t handle, uint8_t *p_nalu, int i_size )
{
    if (fwrite(p_nalu, i_size, 1, (FILE *)handle) > 0)
        return i_size;
    return -1;
}

int set_eop_bsf( hnd_t handle,  x264_picture_t *p_picture )
{
    return 0;
}

int close_file_bsf( hnd_t handle )
{
    if ((handle == NULL) || (handle == stdout))
        return 0;

    return fclose((FILE *)handle);
}

/* -- mp4 muxing support ------------------------------------------------- */
#ifdef MP4_OUTPUT

typedef struct
{
    GF_ISOFile *p_file;
    GF_AVCConfig *p_config;
    GF_ISOSample *p_sample;
    int i_track;
    uint32_t i_descidx;
    int i_time_inc;
    int i_time_res;
    int i_numframe;
    int i_init_delay;
    uint8_t b_sps;
    uint8_t b_pps;
} mp4_t;


void recompute_bitrate_mp4(GF_ISOFile *p_file, int i_track)
{
    u32 i, count, di, timescale, time_wnd, rate;
    u64 offset;
    Double br;
    GF_ESD *esd;

    esd = gf_isom_get_esd(p_file, i_track, 1);
    if (!esd) return;

    esd->decoderConfig->avgBitrate = 0;
    esd->decoderConfig->maxBitrate = 0;
    rate = time_wnd = 0;

    timescale = gf_isom_get_media_timescale(p_file, i_track);
    count = gf_isom_get_sample_count(p_file, i_track);
    for (i=0; i<count; i++) {
        GF_ISOSample *samp = gf_isom_get_sample_info(p_file, i_track, i+1, &di, &offset);

        if (samp->dataLength>esd->decoderConfig->bufferSizeDB) esd->decoderConfig->bufferSizeDB = samp->dataLength;

        if (esd->decoderConfig->bufferSizeDB < samp->dataLength) esd->decoderConfig->bufferSizeDB = samp->dataLength;
        esd->decoderConfig->avgBitrate += samp->dataLength;
        rate += samp->dataLength;
        if (samp->DTS > time_wnd + timescale) {
            if (rate > esd->decoderConfig->maxBitrate) esd->decoderConfig->maxBitrate = rate;
            time_wnd = samp->DTS;
            rate = 0;
        }

        gf_isom_sample_del(&samp);
    }

    br = (Double) (s64) gf_isom_get_media_duration(p_file, i_track);
    br /= timescale;
    esd->decoderConfig->avgBitrate = (u32) (esd->decoderConfig->avgBitrate / br);
    /*move to bps*/
    esd->decoderConfig->avgBitrate *= 8;
    esd->decoderConfig->maxBitrate *= 8;

    gf_isom_change_mpeg4_description(p_file, i_track, 1, esd);
    gf_odf_desc_del((GF_Descriptor *) esd);
}


int close_file_mp4( hnd_t handle )
{
    mp4_t *p_mp4 = (mp4_t *)handle;

    if (p_mp4 == NULL)
        return 0;

    if (p_mp4->p_config)
        gf_odf_avc_cfg_del(p_mp4->p_config);

    if (p_mp4->p_sample)
    {
        if (p_mp4->p_sample->data)
            free(p_mp4->p_sample->data);

        gf_isom_sample_del(&p_mp4->p_sample);
    }

    if (p_mp4->p_file)
    {
        recompute_bitrate_mp4(p_mp4->p_file, p_mp4->i_track);
        gf_isom_set_pl_indication(p_mp4->p_file, GF_ISOM_PL_VISUAL, 0x15);
        gf_isom_set_storage_mode(p_mp4->p_file, GF_ISOM_STORE_FLAT);
        gf_isom_close(p_mp4->p_file);
    }

    free(p_mp4);

    return 0;
}

int open_file_mp4( char *psz_filename, hnd_t *p_handle )
{
    mp4_t *p_mp4;

    *p_handle = NULL;

    if ((p_mp4 = (mp4_t *)malloc(sizeof(mp4_t))) == NULL)
        return -1;

    memset(p_mp4, 0, sizeof(mp4_t));
    p_mp4->p_file = gf_isom_open(psz_filename, GF_ISOM_OPEN_WRITE, NULL);

    if ((p_mp4->p_sample = gf_isom_sample_new()) == NULL)
    {
        close_file_mp4( p_mp4 );
        return -1;
    }

    gf_isom_set_brand_info(p_mp4->p_file, GF_ISOM_BRAND_AVC1, 0);

    *p_handle = p_mp4;

    return 0;
}


int set_param_mp4( hnd_t handle, x264_param_t *p_param )
{
    mp4_t *p_mp4 = (mp4_t *)handle;

    p_mp4->i_track = gf_isom_new_track(p_mp4->p_file, 0, GF_ISOM_MEDIA_VISUAL,
        p_param->i_fps_num);

    p_mp4->p_config = gf_odf_avc_cfg_new();
    gf_isom_avc_config_new(p_mp4->p_file, p_mp4->i_track, p_mp4->p_config,
        NULL, NULL, &p_mp4->i_descidx);

    gf_isom_set_track_enabled(p_mp4->p_file, p_mp4->i_track, 1);

    gf_isom_set_visual_info(p_mp4->p_file, p_mp4->i_track, p_mp4->i_descidx,
        p_param->i_width, p_param->i_height);

    p_mp4->p_sample->data = (char *)malloc(p_param->i_width * p_param->i_height * 3 / 2);
    if (p_mp4->p_sample->data == NULL)
        return -1;

    p_mp4->i_time_res = p_param->i_fps_num;
    p_mp4->i_time_inc = p_param->i_fps_den;
    p_mp4->i_init_delay = p_param->i_bframe ? (p_param->b_bframe_pyramid ? 2 : 1) : 0;
    p_mp4->i_init_delay *= p_mp4->i_time_inc;
    fprintf(stderr, "mp4 [info]: initial delay %d (scale %d)\n",
        p_mp4->i_init_delay, p_mp4->i_time_res);

    return 0;
}


int write_nalu_mp4( hnd_t handle, uint8_t *p_nalu, int i_size )
{
    mp4_t *p_mp4 = (mp4_t *)handle;
    GF_AVCConfigSlot *p_slot;
    uint8_t type = p_nalu[4] & 0x1f;
    int psize;

    switch(type)
    {
    // sps
    case 0x07:
        if (!p_mp4->b_sps)
        {
            p_mp4->p_config->configurationVersion = 1;
            p_mp4->p_config->AVCProfileIndication = p_nalu[5];
            p_mp4->p_config->profile_compatibility = p_nalu[6];
            p_mp4->p_config->AVCLevelIndication = p_nalu[7];
            p_slot = (GF_AVCConfigSlot *)malloc(sizeof(GF_AVCConfigSlot));
            p_slot->size = i_size - 4;
            p_slot->data = (char *)malloc(p_slot->size);
            memcpy(p_slot->data, p_nalu + 4, i_size - 4);
            gf_list_add(p_mp4->p_config->sequenceParameterSets, p_slot);
            p_slot = NULL;
            p_mp4->b_sps = 1;
        }
        break;

    // pps
    case 0x08:
        if (!p_mp4->b_pps)
        {
            p_slot = (GF_AVCConfigSlot *)malloc(sizeof(GF_AVCConfigSlot));
            p_slot->size = i_size - 4;
            p_slot->data = (char *)malloc(p_slot->size);
            memcpy(p_slot->data, p_nalu + 4, i_size - 4);
            gf_list_add(p_mp4->p_config->pictureParameterSets, p_slot);
            p_slot = NULL;
            p_mp4->b_pps = 1;
            if (p_mp4->b_sps)
                gf_isom_avc_config_update(p_mp4->p_file, p_mp4->i_track, 1, p_mp4->p_config);
        }
        break;

    // slice, sei
    case 0x1:
    case 0x5:
    case 0x6:
        psize = i_size - 4 ;
        memcpy(p_mp4->p_sample->data + p_mp4->p_sample->dataLength, p_nalu, i_size);
        p_mp4->p_sample->data[p_mp4->p_sample->dataLength + 0] = (psize >> 24) & 0xff;
        p_mp4->p_sample->data[p_mp4->p_sample->dataLength + 1] = (psize >> 16) & 0xff;
        p_mp4->p_sample->data[p_mp4->p_sample->dataLength + 2] = (psize >> 8) & 0xff;
        p_mp4->p_sample->data[p_mp4->p_sample->dataLength + 3] = (psize >> 0) & 0xff;
        p_mp4->p_sample->dataLength += i_size;
        break;
    }

    return i_size;
}

int set_eop_mp4( hnd_t handle, x264_picture_t *p_picture )
{
    mp4_t *p_mp4 = (mp4_t *)handle;
    uint64_t dts = (uint64_t)p_mp4->i_numframe * p_mp4->i_time_inc;
    uint64_t pts = (uint64_t)p_picture->i_pts;
    int32_t offset = p_mp4->i_init_delay + pts - dts;

    p_mp4->p_sample->IsRAP = p_picture->i_type == X264_TYPE_IDR ? 1 : 0;
    p_mp4->p_sample->DTS = dts;
    p_mp4->p_sample->CTS_Offset = offset;
    gf_isom_add_sample(p_mp4->p_file, p_mp4->i_track, p_mp4->i_descidx, p_mp4->p_sample);

    p_mp4->p_sample->dataLength = 0;
    p_mp4->i_numframe++;

    return 0;
}

#endif


/* -- mkv muxing support ------------------------------------------------- */
typedef struct
{
    mk_Writer *w;

    uint8_t   *sps, *pps;
    int       sps_len, pps_len;

    int       width, height, d_width, d_height;

    int64_t   frame_duration;
    int       fps_num;

    int       b_header_written;
    char      b_writing_frame;
} mkv_t;

int write_header_mkv( mkv_t *p_mkv )
{
    int       ret;
    uint8_t   *avcC;
    int  avcC_len;

    if( p_mkv->sps == NULL || p_mkv->pps == NULL ||
        p_mkv->width == 0 || p_mkv->height == 0 ||
        p_mkv->d_width == 0 || p_mkv->d_height == 0)
        return -1;

    avcC_len = 5 + 1 + 2 + p_mkv->sps_len + 1 + 2 + p_mkv->pps_len;
    avcC = malloc(avcC_len);
    if (avcC == NULL)
        return -1;

    avcC[0] = 1;
    avcC[1] = p_mkv->sps[1];
    avcC[2] = p_mkv->sps[2];
    avcC[3] = p_mkv->sps[3];
    avcC[4] = 0xff; // nalu size length is four bytes
    avcC[5] = 0xe1; // one sps

    avcC[6] = p_mkv->sps_len >> 8;
    avcC[7] = p_mkv->sps_len;

    memcpy(avcC+8, p_mkv->sps, p_mkv->sps_len);

    avcC[8+p_mkv->sps_len] = 1; // one pps
    avcC[9+p_mkv->sps_len] = p_mkv->pps_len >> 8;
    avcC[10+p_mkv->sps_len] = p_mkv->pps_len;

    memcpy( avcC+11+p_mkv->sps_len, p_mkv->pps, p_mkv->pps_len );

    ret = mk_writeHeader( p_mkv->w, "x264", "V_MPEG4/ISO/AVC",
                          avcC, avcC_len, p_mkv->frame_duration, 50000,
                          p_mkv->width, p_mkv->height,
                          p_mkv->d_width, p_mkv->d_height );

    free( avcC );

    p_mkv->b_header_written = 1;

    return ret;
}

int open_file_mkv( char *psz_filename, hnd_t *p_handle )
{
    mkv_t *p_mkv;

    *p_handle = NULL;

    p_mkv  = malloc(sizeof(*p_mkv));
    if (p_mkv == NULL)
        return -1;

    memset(p_mkv, 0, sizeof(*p_mkv));

    p_mkv->w = mk_createWriter(psz_filename);
    if (p_mkv->w == NULL)
    {
        free(p_mkv);
        return -1;
    }

    *p_handle = p_mkv;

    return 0;
}

int set_param_mkv( hnd_t handle, x264_param_t *p_param )
{
    mkv_t   *p_mkv = handle;
    int64_t dw, dh;

    if( p_param->i_fps_num > 0 )
    {
        p_mkv->frame_duration = (int64_t)p_param->i_fps_den *
                                (int64_t)1000000000 / p_param->i_fps_num;
        p_mkv->fps_num = p_param->i_fps_num;
    }
    else
    {
        p_mkv->frame_duration = 0;
        p_mkv->fps_num = 1;
    }

    p_mkv->width = p_param->i_width;
    p_mkv->height = p_param->i_height;

    if( p_param->vui.i_sar_width && p_param->vui.i_sar_height )
    {
        dw = (int64_t)p_param->i_width  * p_param->vui.i_sar_width;
        dh = (int64_t)p_param->i_height * p_param->vui.i_sar_height;
    }
    else
    {
        dw = p_param->i_width;
        dh = p_param->i_height;
    }

    if( dw > 0 && dh > 0 )
    {
        int64_t x = gcd( dw, dh );
        dw /= x;
        dh /= x;
    }

    p_mkv->d_width = (int)dw;
    p_mkv->d_height = (int)dh;

    return 0;
}

int write_nalu_mkv( hnd_t handle, uint8_t *p_nalu, int i_size )
{
    mkv_t *p_mkv = handle;
    uint8_t type = p_nalu[4] & 0x1f;
    uint8_t dsize[4];
    int psize;

    switch( type )
    {
    // sps
    case 0x07:
        if( !p_mkv->sps )
        {
            p_mkv->sps = malloc(i_size - 4);
            if (p_mkv->sps == NULL)
                return -1;
            p_mkv->sps_len = i_size - 4;
            memcpy(p_mkv->sps, p_nalu + 4, i_size - 4);
        }
        break;

    // pps
    case 0x08:
        if( !p_mkv->pps )
        {
            p_mkv->pps = malloc(i_size - 4);
            if (p_mkv->pps == NULL)
                return -1;
            p_mkv->pps_len = i_size - 4;
            memcpy(p_mkv->pps, p_nalu + 4, i_size - 4);
        }
        break;

    // slice, sei
    case 0x1:
    case 0x5:
    case 0x6:
        if( !p_mkv->b_writing_frame )
        {
            if( mk_startFrame(p_mkv->w) < 0 )
                return -1;
            p_mkv->b_writing_frame = 1;
        }
        psize = i_size - 4 ;
        dsize[0] = psize >> 24;
        dsize[1] = psize >> 16;
        dsize[2] = psize >> 8;
        dsize[3] = psize;
        if( mk_addFrameData(p_mkv->w, dsize, 4) < 0 ||
            mk_addFrameData(p_mkv->w, p_nalu + 4, i_size - 4) < 0 )
            return -1;
        break;

    default:
        break;
    }

    if( !p_mkv->b_header_written && p_mkv->pps && p_mkv->sps &&
        write_header_mkv(p_mkv) < 0 )
        return -1;

    return i_size;
}

int set_eop_mkv( hnd_t handle, x264_picture_t *p_picture )
{
    mkv_t *p_mkv = handle;
    int64_t i_stamp = (int64_t)(p_picture->i_pts * 1e9 / p_mkv->fps_num);

    p_mkv->b_writing_frame = 0;

    return mk_setFrameFlags( p_mkv->w, i_stamp,
                             p_picture->i_type == X264_TYPE_IDR );
}

int close_file_mkv( hnd_t handle )
{
    mkv_t *p_mkv = handle;
    int   ret;

    if( p_mkv->sps )
        free( p_mkv->sps );
    if( p_mkv->pps )
        free( p_mkv->pps );

    ret = mk_close(p_mkv->w);

    free( p_mkv );

    return ret;
}

