mpv/demux/demux_mf.c

/*
 * This file is part of MPlayer.
 *
 * MPlayer 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.
 *
 * MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#include "osdep/io.h"

#include "talloc.h"
#include "config.h"
#include "mpvcore/mp_msg.h"

#include "stream/stream.h"
#include "demux.h"
#include "stheader.h"
#include "mf.h"

#define MF_MAX_FILE_SIZE (1024*1024*256)

static void free_mf(mf_t *mf)
{
    if (mf) {
        for (int n = 0; n < mf->nr_of_files; n++)
            free(mf->names[n]);
        free(mf->names);
        free(mf->streams);
        free(mf);
    }
}

static void demux_seek_mf(demuxer_t *demuxer, float rel_seek_secs, int flags)
{
  mf_t * mf = (mf_t *)demuxer->priv;
  int newpos = (flags & SEEK_ABSOLUTE)?0:mf->curr_frame - 1;

  if ( flags & SEEK_FACTOR ) newpos+=rel_seek_secs*(mf->nr_of_files - 1);
   else newpos+=rel_seek_secs * mf->sh->fps;
  if ( newpos < 0 ) newpos=0;
  if( newpos >= mf->nr_of_files) newpos=mf->nr_of_files - 1;
  mf->curr_frame=newpos;
}

// return value:
//     0 = EOF or no stream found
//     1 = successfully read a packet
static int demux_mf_fill_buffer(demuxer_t *demuxer)
{
    mf_t *mf = demuxer->priv;
    if (mf->curr_frame >= mf->nr_of_files)
        return 0;

    struct stream *entry_stream = NULL;
    if (mf->streams)
        entry_stream = mf->streams[mf->curr_frame];
    struct stream *stream = entry_stream;
    if (!stream) {
        char *filename = mf->names[mf->curr_frame];
        if (filename)
            stream = stream_open(filename, demuxer->opts);
    }

    if (stream) {
        stream_seek(stream, 0);
        bstr data = stream_read_complete(stream, NULL, MF_MAX_FILE_SIZE);
        if (data.len) {
            demux_packet_t *dp = new_demux_packet(data.len);
            memcpy(dp->buffer, data.start, data.len);
            dp->pts = mf->curr_frame / mf->sh->fps;
            dp->keyframe = true;
            demuxer_add_packet(demuxer, demuxer->streams[0], dp);
        }
        talloc_free(data.start);
    }

    if (stream && stream != entry_stream)
        free_stream(stream);

    mf->curr_frame++;
    return 1;
}

// map file extension/type to a codec name

static const struct {
  const char *type;
  const char *codec;
} type2format[] = {
  { "bmp",  "bmp" },
  { "dpx",  "dpx" },
  { "j2c",  "jpeg2000" },
  { "j2k",  "jpeg2000" },
  { "jp2",  "jpeg2000" },
  { "jpc",  "jpeg2000" },
  { "jpeg", "mjpeg" },
  { "jpg",  "mjpeg" },
  { "jps",  "mjpeg" },
  { "jls",  "ljpeg" },
  { "thm",  "mjpeg" },
  { "db",   "mjpeg" },
  { "pcx",  "pcx" },
  { "png",  "png" },
  { "pns",  "png" },
  { "ptx",  "ptx" },
  { "tga",  "targa" },
  { "tif",  "tiff" },
  { "tiff", "tiff" },
  { "sgi",  "sgi" },
  { "sun",  "sunrast" },
  { "ras",  "sunrast" },
  { "rs",   "sunrast" },
  { "ra",   "sunrast" },
  { "im1",  "sunrast" },
  { "im8",  "sunrast" },
  { "im24",  "sunrast" },
  { "im32",  "sunrast" },
  { "sunras",  "sunrast" },
  { "xbm",  "xbm" },
  { "pam",  "pam" },
  { "pbm",  "pbm" },
  { "pgm",  "pgm" },
  { "pgmyuv",  "pgmyuv" },
  { "ppm",  "ppm" },
  { "pnm",  "ppm" },
  { "gif",  "gif" }, // usually handled by demux_lavf
  { "pix",  "brender_pix" },
  { "exr",  "exr" },
  { "pic",  "pictor" },
  { "xface",  "xface" },
  { "xwd",  "xwd" },
  {0}
};

static const char *probe_format(mf_t *mf, enum demux_check check)
{
    if (check > DEMUX_CHECK_REQUEST)
        return NULL;
    char *type = mf_type;
    if (!type || !type[0]) {
        char *p = strrchr(mf->names[0], '.');
        if (p)
            type = p + 1;
    }
    for (int i = 0; type2format[i].type; i++) {
        if (type && strcasecmp(type, type2format[i].type) == 0)
            return type2format[i].codec;
    }
    if (check == DEMUX_CHECK_REQUEST) {
        if (!mf_type) {
            mp_msg(MSGT_DEMUX, MSGL_ERR,
                   "[demux_mf] file type was not set! (try --mf-type=ext)\n");
        } else  {
            mp_msg(MSGT_DEMUX, MSGL_ERR,
                   "[demux_mf] --mf-type set to an unknown codec!\n");
        }
    }
    return NULL;
}

static int demux_open_mf(demuxer_t* demuxer, enum demux_check check)
{
  sh_video_t   *sh_video = NULL;
  mf_t *mf;

  if (strncmp(demuxer->stream->url, "mf://", 5) == 0 &&
      demuxer->stream->type == STREAMTYPE_MF)
  {
    mf = open_mf_pattern(demuxer->stream->url + 5);
  } else {
    mf = open_mf_single(demuxer->stream->url);
    mf->streams = calloc(1, sizeof(struct stream *));
    mf->streams[0] = demuxer->stream;
  }

  if (!mf || mf->nr_of_files < 1)
    goto error;

  const char *codec = probe_format(mf, check);
  if (!codec)
    goto error;

  mf->curr_frame = 0;

  // create a new video stream header
  struct sh_stream *sh = new_sh_stream(demuxer, STREAM_VIDEO);
  sh_video = sh->video;

  sh_video->gsh->codec = codec;
  sh_video->disp_w = 0;
  sh_video->disp_h = 0;
  sh_video->fps = mf_fps;

  mf->sh = sh_video;
  demuxer->priv=(void*)mf;
  demuxer->seekable = true;

  return 0;

error:
  free_mf(mf);
  return -1;
}

static void demux_close_mf(demuxer_t* demuxer) {
  mf_t *mf = demuxer->priv;

  free_mf(mf);
}

static int demux_control_mf(demuxer_t *demuxer, int cmd, void *arg) {
  mf_t *mf = (mf_t *)demuxer->priv;

  switch(cmd) {
    case DEMUXER_CTRL_GET_TIME_LENGTH:
      *((double *)arg) = (double)mf->nr_of_files / mf->sh->fps;
      return DEMUXER_CTRL_OK;

    default:
      return DEMUXER_CTRL_NOTIMPL;
  }
}

const demuxer_desc_t demuxer_desc_mf = {
    .name = "mf",
    .desc = "image files (mf)",
    .fill_buffer = demux_mf_fill_buffer,
    .open = demux_open_mf,
    .close = demux_close_mf,
    .seek = demux_seek_mf,
    .control = demux_control_mf,
};