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write-avi.c

#include "config.h"

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/param.h>
#include <sys/uio.h>

#include "riff.h"
#include "grab-ng.h"

#if 0 /* debugging */
# define LIMIT_OPENDML      (1024*1024) 
#else
# define LIMIT_OPENDML (2000*1024*1024)
#endif

/*
 * M$ vidcap avi video+audio layout
 *
 * riff avi
 *   list hdrl       header
 *     avih          avi header
 *     list strl     video stream header
 *       strh         
 *       strf        
 *     list strl     audio stream header
 *       strh        
 *       strf        
 *     istf          ??? software
 *     idit          ??? timestamp
 *   yunk            ??? 4k page pad
 *   list movi       data
 *     00db          video data
 *     yunk          ??? 4k page pad
 *     [ ... ]
 *     01wb          audio data
 *     [ ... ]
 *   idx1            video frame index
 *
 */

/* ----------------------------------------------------------------------- */

#define TRAP(txt) fprintf(stderr,"%s:%d:%s\n",__FILE__,__LINE__,txt);exit(1);

#define size_strl_vids (sizeof(struct RIFF_strh) + \
                  sizeof(struct RIFF_strf_vids) + \
                  4*5)
#define size_strl_auds (sizeof(struct RIFF_strh) + \
                  sizeof(struct RIFF_strf_auds) + \
                  4*5)

static const struct AVI_HDR avi_hdr = {
    {'R','I','F','F'}, 0,                             {'A','V','I',' '},
    {'L','I','S','T'}, 0,                             {'h','d','r','l'},
    {'a','v','i','h'}, AVI_SWAP4(sizeof(struct RIFF_avih)),      {}
};

static const struct AVIX_HDR avix_hdr = {
    {'R','I','F','F'}, 0,                             {'A','V','I','X'},
    {'L','I','S','T'}, 0,                             {'m','o','v','i'},
};

static const struct AVI_HDR_VIDEO avi_hdr_video = {
    {'L','I','S','T'}, AVI_SWAP4(size_strl_vids),                {'s','t','r','l'},
    {'s','t','r','h'}, AVI_SWAP4(sizeof(struct RIFF_strh)),      {{'v','i','d','s'}},
    {'s','t','r','f'}, AVI_SWAP4(sizeof(struct RIFF_strf_vids)), {}
};

static const struct AVI_HDR_AUDIO avi_hdr_audio = {
    {'L','I','S','T'}, AVI_SWAP4(size_strl_auds),                {'s','t','r','l'},
    {'s','t','r','h'}, AVI_SWAP4(sizeof(struct RIFF_strh)),      {{'a','u','d','s'}},
    {'s','t','r','f'}, AVI_SWAP4(sizeof(struct RIFF_strf_auds)), {}
};

static const struct AVI_HDR_ODML avi_hdr_odml = {
    {'L','I','S','T'}, AVI_SWAP4(sizeof(uint32_t) + 4*3),  {'o','d','m','l'},
    {'d','m','l','h'}, AVI_SWAP4(sizeof(uint32_t)),
};

static const struct AVI_DATA avi_data = {
    {'L','I','S','T'}, 0,                   {'m','o','v','i'},
};

static const struct CHUNK_HDR frame_hdr = {
    {'0','0','d','b'}, 0
};
static const struct CHUNK_HDR sound_hdr = {
    {'0','1','w','b'}, 0
};
static const struct CHUNK_HDR idx_hdr = {
    {'i','d','x','1'}, 0
};

/* ----------------------------------------------------------------------- */

struct avi_video_priv {
    const char handler[4];
    const char compress[4];
    const int  bytesperpixel;
};

struct avi_handle {
    /* file name+handle */
    char   file[MAXPATHLEN];
    int    fd;
    struct iovec *vec;

    /* format */
    struct ng_video_fmt video;
    struct ng_audio_fmt audio;

    /* headers */
    struct AVI_HDR        avi_hdr;
    struct AVIX_HDR       avix_hdr;
    struct AVI_HDR_ODML   avi_hdr_odml;
    struct AVI_HDR_AUDIO  avi_hdr_audio;
    struct AVI_HDR_VIDEO  avi_hdr_video;
    struct AVI_DATA       avi_data;
    struct CHUNK_HDR      frame_hdr;
    struct CHUNK_HDR      sound_hdr;
    struct CHUNK_HDR      idx_hdr;

    /* statistics -- first chunk */
    int    frames;
    off_t  hdr_size;
    off_t  audio_size;
    off_t  data_size;

    /* statistics -- current chunk */
    int    bigfile;
    int    framesx;
    off_t  avix_start;
    off_t  datax_size;
    
    /* statistics -- total */
    int    frames_total;

    /* frame index */
    struct IDX_RECORD *idx_array;
    int    idx_index, idx_count;
    off_t  idx_offset;
    off_t  idx_size;
};

/* ----------------------------------------------------------------------- */
/* idx1 frame index                                                        */

static void
avi_addindex(struct avi_handle *h, char *fourcc,int flags,int chunksize)
{
    if (h->idx_index == h->idx_count) {
      h->idx_count += 256;
      h->idx_array = realloc(h->idx_array,h->idx_count*sizeof(struct IDX_RECORD));
    }
    memcpy(h->idx_array[h->idx_index].id,fourcc,4);
    h->idx_array[h->idx_index].flags=AVI_SWAP4(flags);
    h->idx_array[h->idx_index].offset=AVI_SWAP4(h->idx_offset-h->hdr_size-8);
    h->idx_array[h->idx_index].size=AVI_SWAP4(chunksize);
    h->idx_index++;
    h->idx_offset += chunksize + sizeof(struct CHUNK_HDR);
}

static void
avi_writeindex(struct avi_handle *h)
{
    /* write frame index */
    h->idx_hdr.size = AVI_SWAP4(h->idx_index * sizeof(struct IDX_RECORD));
    write(h->fd,&h->idx_hdr,sizeof(struct CHUNK_HDR));
    write(h->fd,h->idx_array,h->idx_index*sizeof(struct IDX_RECORD));
    h->idx_size += h->idx_index * sizeof(struct IDX_RECORD)
      + sizeof(struct CHUNK_HDR);

    /* update header */
    h->avi_hdr.avih.flags       |= AVI_SWAP4(AVIF_HASINDEX);
}   

static void
avi_bigfile(struct avi_handle *h, int last)
{
    off_t avix_end;
    
    if (h->bigfile) {
      /* finish this chunk */
      avix_end = lseek(h->fd,0,SEEK_CUR);
      lseek(h->fd,h->avix_start,SEEK_SET);
      h->avix_hdr.riff_size = h->datax_size + 4*4;
      h->avix_hdr.data_size = h->datax_size + 4;
      write(h->fd,&h->avix_hdr,sizeof(struct AVIX_HDR));
      lseek(h->fd,avix_end,SEEK_SET);
      h->avix_start = avix_end;
    } else {
      h->avix_start = lseek(h->fd,0,SEEK_CUR);
    }
    if (last)
      return;
    h->bigfile++;
    h->framesx = 0;
    h->datax_size = 0;
    write(h->fd,&h->avix_hdr,sizeof(struct AVIX_HDR));
    if (ng_debug)
      fprintf(stderr,"avi bigfile #%d\n",h->bigfile);
}

/* ----------------------------------------------------------------------- */

static void
avi_write_header(struct avi_handle *h)
{
    off_t curpos;

    /* fill in some statistic values ... */
    h->avi_hdr.riff_size         = AVI_SWAP4(h->hdr_size+h->data_size+h->idx_size);
    h->avi_hdr.hdrl_size         = AVI_SWAP4(h->hdr_size - 4*5);
    h->avi_hdr.avih.frames       = AVI_SWAP4(h->frames);
    if (h->video.fmtid != VIDEO_NONE)
      h->avi_hdr_video.strh.length = AVI_SWAP4(h->frames);
    if (h->audio.fmtid != AUDIO_NONE)
      h->avi_hdr_audio.strh.length =
          AVI_SWAP4(h->audio_size/h->avi_hdr_audio.strh.scale);
    h->avi_data.data_size        = AVI_SWAP4(h->data_size);
    
    /* ... and write header again */
    curpos = lseek(h->fd,0,SEEK_CUR);
    lseek(h->fd,0,SEEK_SET);
    write(h->fd,&h->avi_hdr,sizeof(struct AVI_HDR));
    if (h->video.fmtid != VIDEO_NONE)
      write(h->fd,&h->avi_hdr_video,sizeof(struct AVI_HDR_VIDEO));
    if (h->audio.fmtid != AUDIO_NONE)
      write(h->fd,&h->avi_hdr_audio,sizeof(struct AVI_HDR_AUDIO));
    if (h->video.fmtid != VIDEO_NONE) {
      h->avi_hdr_odml.total_frames = h->frames_total;
      write(h->fd,&h->avi_hdr_odml,sizeof(struct AVI_HDR_ODML));
    }
    write(h->fd,&h->avi_data,sizeof(struct AVI_DATA));
    lseek(h->fd,curpos,SEEK_SET);
}

static void*
avi_open(char *filename, char *dummy,
       struct ng_video_fmt *video, const void *priv_video, int fps,
       struct ng_audio_fmt *audio, const void *priv_audio)
{
    const struct avi_video_priv  *pvideo = priv_video;
    struct avi_handle      *h;
    int i,frame_bytes,depth,streams,rate,us_frame;

    if (NULL == (h = malloc(sizeof(*h))))
      return NULL;
    if (NULL == filename)
      return NULL;

    /* init */
    memset(h,0,sizeof(*h));
    h->video         = *video;
    h->audio         = *audio;
    h->avi_hdr       = avi_hdr;
    h->avix_hdr      = avix_hdr;
    h->avi_hdr_odml  = avi_hdr_odml;
    h->avi_hdr_video = avi_hdr_video;
    h->avi_hdr_audio = avi_hdr_audio;
    h->avi_data      = avi_data;
    h->frame_hdr     = frame_hdr;
    h->sound_hdr     = sound_hdr;
    h->idx_hdr       = idx_hdr;
    h->vec           = malloc(sizeof(struct iovec) * video->height);

    strcpy(h->file,filename);
    if (-1 == (h->fd = open(h->file,O_CREAT | O_RDWR | O_TRUNC, 0666))) {
      fprintf(stderr,"open %s: %s\n",h->file,strerror(errno));
      free(h);
      return NULL;
    }

    /* general */
    streams = 0;
    rate = 0;
    if (h->video.fmtid != VIDEO_NONE) {
      streams++;
      rate += pvideo->bytesperpixel * fps / 1000;
      h->avi_hdr.avih.width       = AVI_SWAP4(h->video.width);
      h->avi_hdr.avih.height      = AVI_SWAP4(h->video.height);
    }
    if (h->audio.fmtid != AUDIO_NONE) {
      streams++;
      rate += ng_afmt_to_channels[h->audio.fmtid] *
          ng_afmt_to_bits[h->audio.fmtid] *
          h->audio.rate / 8;
    }
    us_frame = (long long)1000000000/fps;
    h->avi_hdr.avih.us_frame    = AVI_SWAP4(us_frame);
    h->avi_hdr.avih.bps         = AVI_SWAP4(rate);
    h->avi_hdr.avih.streams     = AVI_SWAP4(streams);
    h->hdr_size += write(h->fd,&h->avi_hdr,sizeof(struct AVI_HDR));

    /* video */
    if (h->video.fmtid != VIDEO_NONE) {
      for (i = 0; i < 4; i++) {
          h->avi_hdr_video.strh.handler[i]     = pvideo->handler[i];
          h->avi_hdr_video.strf.compression[i] = pvideo->compress[i];
      }
      frame_bytes = pvideo->bytesperpixel * h->video.width * h->video.height;
      depth = ng_vfmt_to_depth[h->video.fmtid];
      h->frame_hdr.size                = AVI_SWAP4(frame_bytes);
      h->avi_hdr_video.strh.scale      = AVI_SWAP4(us_frame);
      h->avi_hdr_video.strh.rate       = AVI_SWAP4(1000000);
      h->avi_hdr_video.strf.size       = AVI_SWAP4(sizeof(avi_hdr_video.strf));
      h->avi_hdr_video.strf.width      = AVI_SWAP4(h->video.width);
      h->avi_hdr_video.strf.height     = AVI_SWAP4(h->video.height);
      h->avi_hdr_video.strf.planes     = AVI_SWAP2(1);
      h->avi_hdr_video.strf.bit_cnt    = AVI_SWAP2(depth ? depth : 24);
      h->avi_hdr_video.strf.image_size = AVI_SWAP4(frame_bytes);
      h->hdr_size += write(h->fd,&h->avi_hdr_video,sizeof(struct AVI_HDR_VIDEO));
    }

    /* audio */
    if (h->audio.fmtid != AUDIO_NONE) {
      h->avi_hdr_audio.strh.scale      =
          AVI_SWAP4(ng_afmt_to_channels[h->audio.fmtid] *
                  ng_afmt_to_bits[h->audio.fmtid] / 8);
      h->avi_hdr_audio.strh.rate       =
          AVI_SWAP4(ng_afmt_to_channels[h->audio.fmtid] *
                  ng_afmt_to_bits[h->audio.fmtid] *
                  h->audio.rate / 8);
      h->avi_hdr_audio.strh.samplesize =
          AVI_SWAP4(ng_afmt_to_channels[h->audio.fmtid] *
                  ng_afmt_to_bits[h->audio.fmtid] / 8);
      h->avi_hdr_audio.strf.format     =
          AVI_SWAP2(WAVE_FORMAT_PCM);
      h->avi_hdr_audio.strf.channels   =
          AVI_SWAP2(ng_afmt_to_channels[h->audio.fmtid]);
      h->avi_hdr_audio.strf.rate       =
          AVI_SWAP4(h->audio.rate);
      h->avi_hdr_audio.strf.av_bps     = 
          AVI_SWAP4(ng_afmt_to_channels[h->audio.fmtid] *
                  ng_afmt_to_bits[h->audio.fmtid] *
                  h->audio.rate / 8);
      h->avi_hdr_audio.strf.blockalign =
          AVI_SWAP2(ng_afmt_to_channels[h->audio.fmtid] *
                  ng_afmt_to_bits[h->audio.fmtid] / 8);
      h->avi_hdr_audio.strf.size       =
          AVI_SWAP2(ng_afmt_to_bits[h->audio.fmtid]);
      h->hdr_size += write(h->fd,&h->avi_hdr_audio,
                       sizeof(struct AVI_HDR_AUDIO));
    }
    if (h->video.fmtid != VIDEO_NONE)
      h->hdr_size += write(h->fd,&h->avi_hdr_odml,sizeof(struct AVI_HDR_ODML));

    /* data */
    if (-1 == write(h->fd,&h->avi_data,sizeof(struct AVI_DATA))) {
      fprintf(stderr,"write %s: %s\n",h->file,strerror(errno));
      free(h);
      return NULL;
    }
    h->data_size  = 4; /* list type */

    h->idx_index  = 0;
    h->idx_offset = h->hdr_size + sizeof(struct AVI_DATA);

    avi_write_header(h);
    return h;
}

static int
avi_video(void *handle, struct ng_video_buf *buf)
{
    struct avi_handle *h = handle;
    struct iovec *line;
    int y,bpl,size=0;

    size = (buf->size + 3) & ~3;
    h->frame_hdr.size = AVI_SWAP4(size);
    if (-1 == write(h->fd,&h->frame_hdr,sizeof(struct CHUNK_HDR))) {
      fprintf(stderr,"write %s: %s\n",h->file,strerror(errno));
      return -1;
    }
    switch (h->video.fmtid) {
    case VIDEO_RGB15_LE:
    case VIDEO_BGR24:
      bpl = h->video.width * ng_vfmt_to_depth[h->video.fmtid] / 8;
      for (line = h->vec, y = h->video.height-1;
           y >= 0; line++, y--) {
          line->iov_base = ((unsigned char*)buf->data) + y * bpl;
          line->iov_len  = bpl;
      }
      if (-1 == writev(h->fd,h->vec,h->video.height)) {
          fprintf(stderr,"writev %s: %s\n",h->file,strerror(errno));
          return -1;
      }
      break;
    case VIDEO_MJPEG:
    case VIDEO_JPEG:
      if (-1 == write(h->fd,buf->data,size)) {
          fprintf(stderr,"write %s: %s\n",h->file,strerror(errno));
          return -1;
      }
      break;
    }
    h->frames_total += 1;
    if (!h->bigfile) {
      avi_addindex(h,h->frame_hdr.id,0x12,size);
      h->data_size  += size + sizeof(struct CHUNK_HDR);
      h->frames     += 1;
    } else {
      h->datax_size += size + sizeof(struct CHUNK_HDR);
      h->framesx    += 1;
    }
    if ((h->bigfile ? h->datax_size : h->data_size) > LIMIT_OPENDML)
      avi_bigfile(h,0);
    return 0;
}

static int
avi_audio(void *handle, struct ng_audio_buf *buf)
{
    struct avi_handle *h = handle;

    h->sound_hdr.size = AVI_SWAP4(buf->size);
    if (-1 == write(h->fd,&h->sound_hdr,sizeof(struct CHUNK_HDR))) {
      fprintf(stderr,"write %s: %s\n",h->file,strerror(errno));
      return -1;
    }
    if (-1 == write(h->fd,buf->data,buf->size)) {
      fprintf(stderr,"write %s: %s\n",h->file,strerror(errno));
      return -1;
    }

    if (!h->bigfile) {
      avi_addindex(h,h->sound_hdr.id,0x0,buf->size);
      h->data_size  += buf->size + sizeof(struct CHUNK_HDR);
      h->audio_size += buf->size;
    } else {
      h->datax_size += buf->size + sizeof(struct CHUNK_HDR);
    }
    return 0;
}

static int
avi_close(void *handle)
{
    struct avi_handle *h = handle;

    /* write frame index */
    if (h->video.fmtid != VIDEO_NONE) {
      if (!h->bigfile) {
          avi_writeindex(h);
      } else {
          avi_bigfile(h,1);
          h->idx_size = 0;
      }
    }

    avi_write_header(h);
    close(h->fd);
    free(h->vec);
    free(h);
    return 0;
}

/* ----------------------------------------------------------------------- */
/* data structures describing our capabilities                             */

static struct avi_video_priv avi_rgb15 = {
    bytesperpixel:  2,
};
static struct avi_video_priv avi_rgb24 = {
    bytesperpixel:  3,
};
static struct avi_video_priv avi_mjpeg = {
    handler:        {'M','J','P','G'},
    compress:       {'M','J','P','G'},
    bytesperpixel:  3,
};
static const struct ng_format_list avi_vformats[] = {
    {
      name:  "rgb15",
      ext:   "avi",
      fmtid: VIDEO_RGB15_LE,
      priv:  &avi_rgb15,
    },{
      name:  "rgb24",
      ext:   "avi",
      fmtid: VIDEO_BGR24,
      priv:  &avi_rgb24,
    },{
      name:  "mjpeg",
      ext:   "avi",
      fmtid: VIDEO_MJPEG,
      priv:  &avi_mjpeg,
    },{
      name:  "jpeg",
      ext:   "avi",
      fmtid: VIDEO_JPEG,
      priv:  &avi_mjpeg,
    },{
      /* EOF */
    }
};

static const struct ng_format_list avi_aformats[] = {
    {
      name:  "mono8",
      ext:   "avi",
      fmtid: AUDIO_U8_MONO,
    },{
      name:  "mono16",
      ext:   "avi",
      fmtid: AUDIO_S16_LE_MONO,
    },{
      name:  "stereo",
      ext:   "avi",
      fmtid: AUDIO_S16_LE_STEREO,
    },{
      /* EOF */
    }
};

struct ng_writer avi_writer = {
    name:      "avi",
    desc:      "Microsoft AVI (RIFF) format",
    combined:  1,
    video:     avi_vformats,
    audio:     avi_aformats,
    wr_open:   avi_open,
    wr_video:  avi_video,
    wr_audio:  avi_audio,
    wr_close:  avi_close,
};

extern void ng_plugin_init(void);
void ng_plugin_init(void)
{
    ng_writer_register(NG_PLUGIN_MAGIC,__FILE__,&avi_writer);
}

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