atomsrecovery.c 31.4 KB
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/* Quicktime muxer plugin for GStreamer
 * Copyright (C) 2010 Thiago Santos <thiago.sousa.santos@collabora.co.uk>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
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 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
 * Boston, MA 02110-1301, USA.
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 */
/*
 * Unless otherwise indicated, Source Code is licensed under MIT license.
 * See further explanation attached in License Statement (distributed in the file
 * LICENSE).
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

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/*
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 * This module contains functions for serializing partial information from
 * a mux in progress (by qtmux elements). This enables reconstruction of the
 * moov box if a crash happens and thus recovering the movie file.
 *
 * Usage:
 * 1) pipeline: ...yourelements ! qtmux moov-recovery-file=path.mrf ! \
 * filesink location=moovie.mov
 *
 * 2) CRASH!
 *
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 * 3) gst-launch-1.0 qtmoovrecover recovery-input=path.mrf broken-input=moovie.mov \
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        fixed-output=recovered.mov
 *
 * 4) (Hopefully) enjoy recovered.mov.
 *
 * --- Recovery file layout ---
 * 1) Version (a guint16)
 * 2) Prefix atom (if present)
 * 3) ftyp atom
 * 4) MVHD atom (without timescale/duration set)
 * 5) moovie timescale
 * 6) number of traks
 * 7) list of trak atoms (stbl data is ignored, except for the stsd atom)
 * 8) Buffers metadata (metadata that is relevant to the container)
 *    Buffers metadata are stored in the order they are added to the mdat,
 *    each entre has a fixed size and is stored in BE. booleans are stored
 *    as a single byte where 0 means false, otherwise is true.
 *   Metadata:
 *   - guint32   track_id;
 *   - guint32   nsamples;
 *   - guint32   delta;
 *   - guint32   size;
 *   - guint64   chunk_offset;
 *   - gboolean  sync;
 *   - gboolean  do_pts;
 *   - guint64   pts_offset; (always present, ignored if do_pts is false)
 *
 * The mdat file might contain ftyp and then mdat, in case this is the faststart
 * temporary file there is no ftyp and no mdat header, only the buffers data.
 *
 * Notes about recovery file layout: We still don't store tags nor EDTS data.
 *
 * IMPORTANT: this is still at a experimental state.
 */

#include "atomsrecovery.h"

#define ATOMS_RECOV_OUTPUT_WRITE_ERROR(err) \
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE, \
        "Failed to write to output file: %s", g_strerror (errno))

static gboolean
atoms_recov_write_version (FILE * f)
{
  guint8 data[2];
  GST_WRITE_UINT16_BE (data, ATOMS_RECOV_FILE_VERSION);
  return fwrite (data, 2, 1, f) == 1;
}

static gboolean
atoms_recov_write_ftyp_info (FILE * f, AtomFTYP * ftyp, GstBuffer * prefix)
{
  guint8 *data = NULL;
  guint64 offset = 0;
  guint64 size = 0;

  if (prefix) {
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    GstMapInfo map;
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    gst_buffer_map (prefix, &map, GST_MAP_READ);
    if (fwrite (map.data, 1, map.size, f) != map.size) {
      gst_buffer_unmap (prefix, &map);
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      return FALSE;
    }
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    gst_buffer_unmap (prefix, &map);
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  }
  if (!atom_ftyp_copy_data (ftyp, &data, &size, &offset)) {
    return FALSE;
  }
  if (fwrite (data, 1, offset, f) != offset) {
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    g_free (data);
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    return FALSE;
  }
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  g_free (data);
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  return TRUE;
}

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/*
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 * Writes important info on the 'moov' atom (non-trak related)
 * to be able to recover the moov structure after a crash.
 *
 * Currently, it writes the MVHD atom.
 */
static gboolean
atoms_recov_write_moov_info (FILE * f, AtomMOOV * moov)
{
  guint8 *data;
  guint64 size;
  guint64 offset = 0;
  guint64 atom_size = 0;
  gint writen = 0;

  /* likely enough */
  size = 256;
  data = g_malloc (size);
  atom_size = atom_mvhd_copy_data (&moov->mvhd, &data, &size, &offset);
  if (atom_size > 0)
    writen = fwrite (data, 1, atom_size, f);
  g_free (data);
  return atom_size > 0 && writen == atom_size;
}

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/*
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 * Writes the number of traks to the file.
 * This simply writes a guint32 in BE.
 */
static gboolean
atoms_recov_write_traks_number (FILE * f, guint32 traks)
{
  guint8 data[4];
  GST_WRITE_UINT32_BE (data, traks);
  return fwrite (data, 4, 1, f) == 1;
}

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/*
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 * Writes the moov's timescale to the file
 * This simply writes a guint32 in BE.
 */
static gboolean
atoms_recov_write_moov_timescale (FILE * f, guint32 timescale)
{
  guint8 data[4];
  GST_WRITE_UINT32_BE (data, timescale);
  return fwrite (data, 4, 1, f) == 1;
}

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/*
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 * Writes the trak atom to the file.
 */
gboolean
atoms_recov_write_trak_info (FILE * f, AtomTRAK * trak)
{
  guint8 *data;
  guint64 size;
  guint64 offset = 0;
  guint64 atom_size = 0;
  gint writen = 0;

  /* buffer is realloced to a larger size if needed */
  size = 4 * 1024;
  data = g_malloc (size);
  atom_size = atom_trak_copy_data (trak, &data, &size, &offset);
  if (atom_size > 0)
    writen = fwrite (data, atom_size, 1, f);
  g_free (data);
  return atom_size > 0 && writen == atom_size;
}

gboolean
atoms_recov_write_trak_samples (FILE * f, AtomTRAK * trak, guint32 nsamples,
    guint32 delta, guint32 size, guint64 chunk_offset, gboolean sync,
    gboolean do_pts, gint64 pts_offset)
{
  guint8 data[TRAK_BUFFER_ENTRY_INFO_SIZE];
  /*
   * We have to write a TrakBufferEntryInfo
   */
  GST_WRITE_UINT32_BE (data + 0, trak->tkhd.track_ID);
  GST_WRITE_UINT32_BE (data + 4, nsamples);
  GST_WRITE_UINT32_BE (data + 8, delta);
  GST_WRITE_UINT32_BE (data + 12, size);
  GST_WRITE_UINT64_BE (data + 16, chunk_offset);
  if (sync)
    GST_WRITE_UINT8 (data + 24, 1);
  else
    GST_WRITE_UINT8 (data + 24, 0);
  if (do_pts) {
    GST_WRITE_UINT8 (data + 25, 1);
    GST_WRITE_UINT64_BE (data + 26, pts_offset);
  } else {
    GST_WRITE_UINT8 (data + 25, 0);
    GST_WRITE_UINT64_BE (data + 26, 0);
  }

  return fwrite (data, 1, TRAK_BUFFER_ENTRY_INFO_SIZE, f) ==
      TRAK_BUFFER_ENTRY_INFO_SIZE;
}

gboolean
atoms_recov_write_headers (FILE * f, AtomFTYP * ftyp, GstBuffer * prefix,
    AtomMOOV * moov, guint32 timescale, guint32 traks_number)
{
  if (!atoms_recov_write_version (f)) {
    return FALSE;
  }

  if (!atoms_recov_write_ftyp_info (f, ftyp, prefix)) {
    return FALSE;
  }

  if (!atoms_recov_write_moov_info (f, moov)) {
    return FALSE;
  }

  if (!atoms_recov_write_moov_timescale (f, timescale)) {
    return FALSE;
  }

  if (!atoms_recov_write_traks_number (f, traks_number)) {
    return FALSE;
  }

  return TRUE;
}

static gboolean
read_atom_header (FILE * f, guint32 * fourcc, guint32 * size)
{
  guint8 aux[8];

  if (fread (aux, 1, 8, f) != 8)
    return FALSE;
  *size = GST_READ_UINT32_BE (aux);
  *fourcc = GST_READ_UINT32_LE (aux + 4);
  return TRUE;
}

static gboolean
moov_recov_file_parse_prefix (MoovRecovFile * moovrf)
{
  guint32 fourcc;
  guint32 size;
  guint32 total_size = 0;
  if (fseek (moovrf->file, 2, SEEK_SET) != 0)
    return FALSE;
  if (!read_atom_header (moovrf->file, &fourcc, &size)) {
    return FALSE;
  }

  if (fourcc != FOURCC_ftyp) {
    /* we might have a prefix here */
    if (fseek (moovrf->file, size - 8, SEEK_CUR) != 0)
      return FALSE;

    total_size += size;

    /* now read the ftyp */
    if (!read_atom_header (moovrf->file, &fourcc, &size))
      return FALSE;
  }

  /* this has to be the ftyp */
  if (fourcc != FOURCC_ftyp)
    return FALSE;
  total_size += size;
  moovrf->prefix_size = total_size;
  return fseek (moovrf->file, size - 8, SEEK_CUR) == 0;
}

static gboolean
moov_recov_file_parse_mvhd (MoovRecovFile * moovrf)
{
  guint32 fourcc;
  guint32 size;
  if (!read_atom_header (moovrf->file, &fourcc, &size)) {
    return FALSE;
  }
  /* check for sanity */
  if (fourcc != FOURCC_mvhd)
    return FALSE;

  moovrf->mvhd_size = size;
  moovrf->mvhd_pos = ftell (moovrf->file) - 8;

  /* skip the remaining of the mvhd in the file */
  return fseek (moovrf->file, size - 8, SEEK_CUR) == 0;
}

static gboolean
mdat_recov_file_parse_mdat_start (MdatRecovFile * mdatrf)
{
  guint32 fourcc, size;

  if (!read_atom_header (mdatrf->file, &fourcc, &size)) {
    return FALSE;
  }
  if (size == 1) {
    mdatrf->mdat_header_size = 16;
    mdatrf->mdat_size = 16;
  } else {
    mdatrf->mdat_header_size = 8;
    mdatrf->mdat_size = 8;
  }
  mdatrf->mdat_start = ftell (mdatrf->file) - 8;

  return fourcc == FOURCC_mdat;
}

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static gboolean
mdat_recov_file_find_mdat (FILE * file, GError ** err)
{
  guint32 fourcc = 0, size = 0;
  gboolean failure = FALSE;
  while (fourcc != FOURCC_mdat && !failure) {
    if (!read_atom_header (file, &fourcc, &size)) {
      goto parse_error;
    }
    switch (fourcc) {
        /* skip these atoms */
      case FOURCC_ftyp:
      case FOURCC_free:
      case FOURCC_udta:
        if (fseek (file, size - 8, SEEK_CUR) != 0) {
          goto file_seek_error;
        }
        break;
      case FOURCC_mdat:
        break;
      default:
        GST_ERROR ("Unexpected atom in headers %" GST_FOURCC_FORMAT,
            GST_FOURCC_ARGS (fourcc));
        failure = TRUE;
        break;
    }
  }

  if (!failure) {
    /* Reverse to mdat start */
    if (fseek (file, -8, SEEK_CUR) != 0)
      goto file_seek_error;
  }

  return !failure;

parse_error:
  g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
      "Failed to parse atom");
  return FALSE;

file_seek_error:
  g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
      "Failed to seek to start of the file");
  return FALSE;

}

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MdatRecovFile *
mdat_recov_file_create (FILE * file, gboolean datafile, GError ** err)
{
  MdatRecovFile *mrf = g_new0 (MdatRecovFile, 1);

  g_return_val_if_fail (file != NULL, NULL);

  mrf->file = file;
  mrf->rawfile = datafile;

  /* get the file/data length */
  if (fseek (file, 0, SEEK_END) != 0)
    goto file_length_error;
  /* still needs to deduce the mdat header and ftyp size */
  mrf->data_size = ftell (file);
  if (mrf->data_size == -1L)
    goto file_length_error;

  if (fseek (file, 0, SEEK_SET) != 0)
    goto file_seek_error;

  if (datafile) {
    /* this file contains no atoms, only raw data to be placed on the mdat
     * this happens when faststart mode is used */
    mrf->mdat_start = 0;
    mrf->mdat_header_size = 16;
    mrf->mdat_size = 16;
    return mrf;
  }

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  if (!mdat_recov_file_find_mdat (file, err)) {
    goto fail;
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  }

  /* we don't parse this if we have a tmpdatafile */
  if (!mdat_recov_file_parse_mdat_start (mrf)) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_PARSING,
        "Error while parsing mdat atom");
    goto fail;
  }

  return mrf;

file_seek_error:
  g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
      "Failed to seek to start of the file");
  goto fail;

file_length_error:
  g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
      "Failed to determine file size");
  goto fail;

fail:
  mdat_recov_file_free (mrf);
  return NULL;
}

void
mdat_recov_file_free (MdatRecovFile * mrf)
{
  fclose (mrf->file);
  g_free (mrf);
}

static gboolean
moov_recov_parse_num_traks (MoovRecovFile * moovrf)
{
  guint8 traks[4];
  if (fread (traks, 1, 4, moovrf->file) != 4)
    return FALSE;
  moovrf->num_traks = GST_READ_UINT32_BE (traks);
  return TRUE;
}

static gboolean
moov_recov_parse_moov_timescale (MoovRecovFile * moovrf)
{
  guint8 ts[4];
  if (fread (ts, 1, 4, moovrf->file) != 4)
    return FALSE;
  moovrf->timescale = GST_READ_UINT32_BE (ts);
  return TRUE;
}

static gboolean
skip_atom (MoovRecovFile * moovrf, guint32 expected_fourcc)
{
  guint32 size;
  guint32 fourcc;

  if (!read_atom_header (moovrf->file, &fourcc, &size))
    return FALSE;
  if (fourcc != expected_fourcc)
    return FALSE;

  return (fseek (moovrf->file, size - 8, SEEK_CUR) == 0);
}

static gboolean
moov_recov_parse_tkhd (MoovRecovFile * moovrf, TrakRecovData * trakrd)
{
  guint32 size;
  guint32 fourcc;
  guint8 data[4];

  /* make sure we are on a tkhd atom */
  if (!read_atom_header (moovrf->file, &fourcc, &size))
    return FALSE;
  if (fourcc != FOURCC_tkhd)
    return FALSE;

  trakrd->tkhd_file_offset = ftell (moovrf->file) - 8;

  /* move 8 bytes forward to the trak_id pos */
  if (fseek (moovrf->file, 12, SEEK_CUR) != 0)
    return FALSE;
  if (fread (data, 1, 4, moovrf->file) != 4)
    return FALSE;

  /* advance the rest of tkhd */
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  if (fseek (moovrf->file, 68, SEEK_CUR) != 0)
    return FALSE;
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  trakrd->trak_id = GST_READ_UINT32_BE (data);
  return TRUE;
}

static gboolean
moov_recov_parse_stbl (MoovRecovFile * moovrf, TrakRecovData * trakrd)
{
  guint32 size;
  guint32 fourcc;
  guint32 auxsize;

  if (!read_atom_header (moovrf->file, &fourcc, &size))
    return FALSE;
  if (fourcc != FOURCC_stbl)
    return FALSE;

  trakrd->stbl_file_offset = ftell (moovrf->file) - 8;
  trakrd->stbl_size = size;

  /* skip the stsd */
  if (!read_atom_header (moovrf->file, &fourcc, &auxsize))
    return FALSE;
  if (fourcc != FOURCC_stsd)
    return FALSE;
  if (fseek (moovrf->file, auxsize - 8, SEEK_CUR) != 0)
    return FALSE;

  trakrd->stsd_size = auxsize;
  trakrd->post_stsd_offset = ftell (moovrf->file);

  /* as this is the last atom we parse, we don't skip forward */

  return TRUE;
}

static gboolean
moov_recov_parse_minf (MoovRecovFile * moovrf, TrakRecovData * trakrd)
{
  guint32 size;
  guint32 fourcc;
  guint32 auxsize;

  if (!read_atom_header (moovrf->file, &fourcc, &size))
    return FALSE;
  if (fourcc != FOURCC_minf)
    return FALSE;

  trakrd->minf_file_offset = ftell (moovrf->file) - 8;
  trakrd->minf_size = size;

  /* skip either of vmhd, smhd, hmhd that might follow */
  if (!read_atom_header (moovrf->file, &fourcc, &auxsize))
    return FALSE;
  if (fourcc != FOURCC_vmhd && fourcc != FOURCC_smhd && fourcc != FOURCC_hmhd &&
      fourcc != FOURCC_gmhd)
    return FALSE;
  if (fseek (moovrf->file, auxsize - 8, SEEK_CUR))
    return FALSE;

  /* skip a possible hdlr and the following dinf */
  if (!read_atom_header (moovrf->file, &fourcc, &auxsize))
    return FALSE;
  if (fourcc == FOURCC_hdlr) {
    if (fseek (moovrf->file, auxsize - 8, SEEK_CUR))
      return FALSE;
    if (!read_atom_header (moovrf->file, &fourcc, &auxsize))
      return FALSE;
  }
  if (fourcc != FOURCC_dinf)
    return FALSE;
  if (fseek (moovrf->file, auxsize - 8, SEEK_CUR))
    return FALSE;

  /* now we are ready to read the stbl */
  if (!moov_recov_parse_stbl (moovrf, trakrd))
    return FALSE;

  return TRUE;
}

static gboolean
moov_recov_parse_mdhd (MoovRecovFile * moovrf, TrakRecovData * trakrd)
{
  guint32 size;
  guint32 fourcc;
  guint8 data[4];

  /* make sure we are on a tkhd atom */
  if (!read_atom_header (moovrf->file, &fourcc, &size))
    return FALSE;
  if (fourcc != FOURCC_mdhd)
    return FALSE;

  trakrd->mdhd_file_offset = ftell (moovrf->file) - 8;

  /* get the timescale */
  if (fseek (moovrf->file, 12, SEEK_CUR) != 0)
    return FALSE;
  if (fread (data, 1, 4, moovrf->file) != 4)
    return FALSE;
  trakrd->timescale = GST_READ_UINT32_BE (data);
  if (fseek (moovrf->file, 8, SEEK_CUR) != 0)
    return FALSE;
  return TRUE;
}

static gboolean
moov_recov_parse_mdia (MoovRecovFile * moovrf, TrakRecovData * trakrd)
{
  guint32 size;
  guint32 fourcc;

  /* make sure we are on a tkhd atom */
  if (!read_atom_header (moovrf->file, &fourcc, &size))
    return FALSE;
  if (fourcc != FOURCC_mdia)
    return FALSE;

  trakrd->mdia_file_offset = ftell (moovrf->file) - 8;
  trakrd->mdia_size = size;

  if (!moov_recov_parse_mdhd (moovrf, trakrd))
    return FALSE;

  if (!skip_atom (moovrf, FOURCC_hdlr))
    return FALSE;
  if (!moov_recov_parse_minf (moovrf, trakrd))
    return FALSE;
  return TRUE;
}

static gboolean
moov_recov_parse_trak (MoovRecovFile * moovrf, TrakRecovData * trakrd)
{
  guint64 offset;
  guint32 size;
  guint32 fourcc;

  offset = ftell (moovrf->file);
  if (offset == -1) {
    return FALSE;
  }

  /* make sure we are on a trak atom */
  if (!read_atom_header (moovrf->file, &fourcc, &size)) {
    return FALSE;
  }
  if (fourcc != FOURCC_trak) {
    return FALSE;
  }
  trakrd->trak_size = size;

  /* now we should have a trak header 'tkhd' */
  if (!moov_recov_parse_tkhd (moovrf, trakrd))
    return FALSE;

  /* FIXME add edts handling here and in qtmux, as this is only detected
   * after buffers start flowing */

  if (!moov_recov_parse_mdia (moovrf, trakrd))
    return FALSE;

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  if (fseek (moovrf->file,
          (long int) trakrd->mdia_file_offset + trakrd->mdia_size,
          SEEK_SET) != 0)
    return FALSE;

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  trakrd->extra_atoms_offset = ftell (moovrf->file);
  trakrd->extra_atoms_size = size - (trakrd->extra_atoms_offset - offset);

684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723
  trakrd->file_offset = offset;
  /* position after the trak */
  return fseek (moovrf->file, (long int) offset + size, SEEK_SET) == 0;
}

MoovRecovFile *
moov_recov_file_create (FILE * file, GError ** err)
{
  gint i;
  MoovRecovFile *moovrf = g_new0 (MoovRecovFile, 1);

  g_return_val_if_fail (file != NULL, NULL);

  moovrf->file = file;

  /* look for ftyp and prefix at the start */
  if (!moov_recov_file_parse_prefix (moovrf)) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_PARSING,
        "Error while parsing prefix atoms");
    goto fail;
  }

  /* parse the mvhd */
  if (!moov_recov_file_parse_mvhd (moovrf)) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_PARSING,
        "Error while parsing mvhd atom");
    goto fail;
  }

  if (!moov_recov_parse_moov_timescale (moovrf)) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_PARSING,
        "Error while parsing timescale");
    goto fail;
  }
  if (!moov_recov_parse_num_traks (moovrf)) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_PARSING,
        "Error while parsing parsing number of traks");
    goto fail;
  }

724 725 726 727 728 729 730
  /* sanity check */
  if (moovrf->num_traks > 1024) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_PARSING,
        "Unsupported number of traks");
    goto fail;
  }

731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812
  /* init the traks */
  moovrf->traks_rd = g_new0 (TrakRecovData, moovrf->num_traks);
  for (i = 0; i < moovrf->num_traks; i++) {
    atom_stbl_init (&(moovrf->traks_rd[i].stbl));
  }
  for (i = 0; i < moovrf->num_traks; i++) {
    if (!moov_recov_parse_trak (moovrf, &(moovrf->traks_rd[i]))) {
      g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_PARSING,
          "Error while parsing trak atom");
      goto fail;
    }
  }

  return moovrf;

fail:
  moov_recov_file_free (moovrf);
  return NULL;
}

void
moov_recov_file_free (MoovRecovFile * moovrf)
{
  gint i;
  fclose (moovrf->file);
  if (moovrf->traks_rd) {
    for (i = 0; i < moovrf->num_traks; i++) {
      atom_stbl_clear (&(moovrf->traks_rd[i].stbl));
    }
    g_free (moovrf->traks_rd);
  }
  g_free (moovrf);
}

static gboolean
moov_recov_parse_buffer_entry (MoovRecovFile * moovrf, TrakBufferEntryInfo * b)
{
  guint8 data[TRAK_BUFFER_ENTRY_INFO_SIZE];
  gint read;

  read = fread (data, 1, TRAK_BUFFER_ENTRY_INFO_SIZE, moovrf->file);
  if (read != TRAK_BUFFER_ENTRY_INFO_SIZE)
    return FALSE;

  b->track_id = GST_READ_UINT32_BE (data);
  b->nsamples = GST_READ_UINT32_BE (data + 4);
  b->delta = GST_READ_UINT32_BE (data + 8);
  b->size = GST_READ_UINT32_BE (data + 12);
  b->chunk_offset = GST_READ_UINT64_BE (data + 16);
  b->sync = data[24] != 0;
  b->do_pts = data[25] != 0;
  b->pts_offset = GST_READ_UINT64_BE (data + 26);
  return TRUE;
}

static gboolean
mdat_recov_add_sample (MdatRecovFile * mdatrf, guint32 size)
{
  /* test if this data exists */
  if (mdatrf->mdat_size - mdatrf->mdat_header_size + size > mdatrf->data_size)
    return FALSE;

  mdatrf->mdat_size += size;
  return TRUE;
}

static TrakRecovData *
moov_recov_get_trak (MoovRecovFile * moovrf, guint32 id)
{
  gint i;
  for (i = 0; i < moovrf->num_traks; i++) {
    if (moovrf->traks_rd[i].trak_id == id)
      return &(moovrf->traks_rd[i]);
  }
  return NULL;
}

static void
trak_recov_data_add_sample (TrakRecovData * trak, TrakBufferEntryInfo * b)
{
  trak->duration += b->nsamples * b->delta;
  atom_stbl_add_samples (&trak->stbl, b->nsamples, b->delta, b->size,
813
      b->chunk_offset, b->sync, b->pts_offset);
814 815
}

816
/*
817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
 * Parses the buffer entries in the MoovRecovFile and matches the inputs
 * with the data in the MdatRecovFile. Whenever a buffer entry of that
 * represents 'x' bytes of data, the same amount of data is 'validated' in
 * the MdatRecovFile and will be inluded in the generated moovie file.
 */
gboolean
moov_recov_parse_buffers (MoovRecovFile * moovrf, MdatRecovFile * mdatrf,
    GError ** err)
{
  TrakBufferEntryInfo entry;
  TrakRecovData *trak;

  /* we assume both moovrf and mdatrf are at the starting points of their
   * data reading */
  while (moov_recov_parse_buffer_entry (moovrf, &entry)) {
    /* be sure we still have this data in mdat */
    trak = moov_recov_get_trak (moovrf, entry.track_id);
    if (trak == NULL) {
      g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_PARSING,
          "Invalid trak id found in buffer entry");
      return FALSE;
    }
    if (!mdat_recov_add_sample (mdatrf, entry.size))
      break;
    trak_recov_data_add_sample (trak, &entry);
  }
  return TRUE;
}

846
static guint32
847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
trak_recov_data_get_trak_atom_size (TrakRecovData * trak)
{
  AtomSTBL *stbl = &trak->stbl;
  guint64 offset;

  /* write out our stbl child atoms */
  offset = 0;

  if (!atom_stts_copy_data (&stbl->stts, NULL, NULL, &offset)) {
    goto fail;
  }
  if (atom_array_get_len (&stbl->stss.entries) > 0) {
    if (!atom_stss_copy_data (&stbl->stss, NULL, NULL, &offset)) {
      goto fail;
    }
  }
  if (!atom_stsc_copy_data (&stbl->stsc, NULL, NULL, &offset)) {
    goto fail;
  }
  if (!atom_stsz_copy_data (&stbl->stsz, NULL, NULL, &offset)) {
    goto fail;
  }
  if (stbl->ctts) {
    if (!atom_ctts_copy_data (stbl->ctts, NULL, NULL, &offset)) {
      goto fail;
    }
  }
  if (!atom_stco64_copy_data (&stbl->stco64, NULL, NULL, &offset)) {
    goto fail;
  }

  return trak->trak_size + ((trak->stsd_size + offset + 8) - trak->stbl_size);

fail:
  return 0;
}

884
static guint8 *
885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931
moov_recov_get_stbl_children_data (MoovRecovFile * moovrf, TrakRecovData * trak,
    guint64 * p_size)
{
  AtomSTBL *stbl = &trak->stbl;
  guint8 *buffer;
  guint64 size;
  guint64 offset;

  /* write out our stbl child atoms
   *
   * Use 1MB as a starting size, *_copy_data functions
   * will grow the buffer if needed.
   */
  size = 1024 * 1024;
  buffer = g_malloc0 (size);
  offset = 0;

  if (!atom_stts_copy_data (&stbl->stts, &buffer, &size, &offset)) {
    goto fail;
  }
  if (atom_array_get_len (&stbl->stss.entries) > 0) {
    if (!atom_stss_copy_data (&stbl->stss, &buffer, &size, &offset)) {
      goto fail;
    }
  }
  if (!atom_stsc_copy_data (&stbl->stsc, &buffer, &size, &offset)) {
    goto fail;
  }
  if (!atom_stsz_copy_data (&stbl->stsz, &buffer, &size, &offset)) {
    goto fail;
  }
  if (stbl->ctts) {
    if (!atom_ctts_copy_data (stbl->ctts, &buffer, &size, &offset)) {
      goto fail;
    }
  }
  if (!atom_stco64_copy_data (&stbl->stco64, &buffer, &size, &offset)) {
    goto fail;
  }
  *p_size = offset;
  return buffer;

fail:
  g_free (buffer);
  return NULL;
}

932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
static gboolean
copy_data_from_file_to_file (FILE * from, guint position, guint size, FILE * to,
    GError ** err)
{
  guint8 *data = NULL;

  if (fseek (from, position, SEEK_SET) != 0)
    goto fail;
  data = g_malloc (size);
  if (fread (data, 1, size, from) != size) {
    goto fail;
  }
  if (fwrite (data, 1, size, to) != size) {
    ATOMS_RECOV_OUTPUT_WRITE_ERROR (err);
    goto fail;
  }

  g_free (data);
  return TRUE;

fail:
  g_free (data);
  return FALSE;
}

957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
gboolean
moov_recov_write_file (MoovRecovFile * moovrf, MdatRecovFile * mdatrf,
    FILE * outf, GError ** err)
{
  guint8 auxdata[16];
  guint8 *data = NULL;
  guint8 *prefix_data = NULL;
  guint8 *mvhd_data = NULL;
  guint8 *trak_data = NULL;
  guint32 moov_size = 0;
  gint i;
  guint64 stbl_children_size = 0;
  guint8 *stbl_children = NULL;
  guint32 longest_duration = 0;
  guint16 version;

  /* check the version */
  if (fseek (moovrf->file, 0, SEEK_SET) != 0) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
        "Failed to seek to the start of the moov recovery file");
    goto fail;
  }
  if (fread (auxdata, 1, 2, moovrf->file) != 2) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
        "Failed to read version from file");
  }

  version = GST_READ_UINT16_BE (auxdata);
  if (version != ATOMS_RECOV_FILE_VERSION) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_VERSION,
        "Input file version (%u) is not supported in this version (%u)",
        version, ATOMS_RECOV_FILE_VERSION);
    return FALSE;
  }

  /* write the ftyp */
  prefix_data = g_malloc (moovrf->prefix_size);
  if (fread (prefix_data, 1, moovrf->prefix_size,
          moovrf->file) != moovrf->prefix_size) {
    g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
        "Failed to read the ftyp atom from file");
    goto fail;
  }
  if (fwrite (prefix_data, 1, moovrf->prefix_size, outf) != moovrf->prefix_size) {
    ATOMS_RECOV_OUTPUT_WRITE_ERROR (err);
    goto fail;
  }
  g_free (prefix_data);
  prefix_data = NULL;

  /* need to calculate the moov size beforehand to add the offset to
   * chunk offset entries */
  moov_size += moovrf->mvhd_size + 8;   /* mvhd + moov size + fourcc */
  for (i = 0; i < moovrf->num_traks; i++) {
    TrakRecovData *trak = &(moovrf->traks_rd[i]);
    guint32 duration;           /* in moov's timescale */
    guint32 trak_size;

    /* convert trak duration to moov's duration */
    duration = gst_util_uint64_scale_round (trak->duration, moovrf->timescale,
        trak->timescale);

    if (duration > longest_duration)
      longest_duration = duration;
    trak_size = trak_recov_data_get_trak_atom_size (trak);
    if (trak_size == 0) {
      g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_GENERIC,
          "Failed to estimate trak atom size");
      goto fail;
    }
    moov_size += trak_size;
  }

  /* add chunks offsets */
  for (i = 0; i < moovrf->num_traks; i++) {
    TrakRecovData *trak = &(moovrf->traks_rd[i]);
    /* 16 for the mdat header */
    gint64 offset = moov_size + ftell (outf) + 16;
1035
    atom_stco64_chunks_set_offset (&trak->stbl.stco64, offset);
1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
  }

  /* write the moov */
  GST_WRITE_UINT32_BE (auxdata, moov_size);
  GST_WRITE_UINT32_LE (auxdata + 4, FOURCC_moov);
  if (fwrite (auxdata, 1, 8, outf) != 8) {
    ATOMS_RECOV_OUTPUT_WRITE_ERROR (err);
    goto fail;
  }

  /* write the mvhd */
  mvhd_data = g_malloc (moovrf->mvhd_size);
  if (fseek (moovrf->file, moovrf->mvhd_pos, SEEK_SET) != 0)
    goto fail;
  if (fread (mvhd_data, 1, moovrf->mvhd_size,
          moovrf->file) != moovrf->mvhd_size)
    goto fail;
  GST_WRITE_UINT32_BE (mvhd_data + 20, moovrf->timescale);
  GST_WRITE_UINT32_BE (mvhd_data + 24, longest_duration);
  if (fwrite (mvhd_data, 1, moovrf->mvhd_size, outf) != moovrf->mvhd_size) {
    ATOMS_RECOV_OUTPUT_WRITE_ERROR (err);
    goto fail;
  }
  g_free (mvhd_data);
  mvhd_data = NULL;

  /* write the traks, this is the tough part because we need to update:
   * - stbl atom
   * - sizes of atoms from stbl to trak
   * - trak duration
   */
  for (i = 0; i < moovrf->num_traks; i++) {
    TrakRecovData *trak = &(moovrf->traks_rd[i]);
    guint trak_data_size;
    guint32 stbl_new_size;
    guint32 minf_new_size;
    guint32 mdia_new_size;
    guint32 trak_new_size;
    guint32 size_diff;
    guint32 duration;           /* in moov's timescale */

    /* convert trak duration to moov's duration */
    duration = gst_util_uint64_scale_round (trak->duration, moovrf->timescale,
        trak->timescale);

    stbl_children = moov_recov_get_stbl_children_data (moovrf, trak,
        &stbl_children_size);
    if (stbl_children == NULL)
      goto fail;

    /* calc the new size of the atoms from stbl to trak in the atoms tree */
    stbl_new_size = trak->stsd_size + stbl_children_size + 8;
    size_diff = stbl_new_size - trak->stbl_size;
    minf_new_size = trak->minf_size + size_diff;
    mdia_new_size = trak->mdia_size + size_diff;
    trak_new_size = trak->trak_size + size_diff;

    if (fseek (moovrf->file, trak->file_offset, SEEK_SET) != 0)
      goto fail;
    trak_data_size = trak->post_stsd_offset - trak->file_offset;
    trak_data = g_malloc (trak_data_size);
    if (fread (trak_data, 1, trak_data_size, moovrf->file) != trak_data_size) {
      goto fail;
    }
    /* update the size values in those read atoms before writing */
    GST_WRITE_UINT32_BE (trak_data, trak_new_size);
    GST_WRITE_UINT32_BE (trak_data + (trak->mdia_file_offset -
            trak->file_offset), mdia_new_size);
    GST_WRITE_UINT32_BE (trak_data + (trak->minf_file_offset -
            trak->file_offset), minf_new_size);
    GST_WRITE_UINT32_BE (trak_data + (trak->stbl_file_offset -
            trak->file_offset), stbl_new_size);

    /* update duration values in tkhd and mdhd */
    GST_WRITE_UINT32_BE (trak_data + (trak->tkhd_file_offset -
            trak->file_offset) + 28, duration);
    GST_WRITE_UINT32_BE (trak_data + (trak->mdhd_file_offset -
            trak->file_offset) + 24, trak->duration);

    if (fwrite (trak_data, 1, trak_data_size, outf) != trak_data_size) {
      ATOMS_RECOV_OUTPUT_WRITE_ERROR (err);
      goto fail;
    }
    if (fwrite (stbl_children, 1, stbl_children_size, outf) !=
        stbl_children_size) {
      ATOMS_RECOV_OUTPUT_WRITE_ERROR (err);
      goto fail;
    }
1124

1125 1126 1127 1128
    g_free (trak_data);
    trak_data = NULL;
    g_free (stbl_children);
    stbl_children = NULL;
1129 1130 1131 1132 1133

    /* Copy the extra atoms after 'minf' */
    if (!copy_data_from_file_to_file (moovrf->file, trak->extra_atoms_offset,
            trak->extra_atoms_size, outf, err))
      goto fail;
1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
  }

  /* write the mdat */
  /* write the header first */
  GST_WRITE_UINT32_BE (auxdata, 1);
  GST_WRITE_UINT32_LE (auxdata + 4, FOURCC_mdat);
  GST_WRITE_UINT64_BE (auxdata + 8, mdatrf->mdat_size);
  if (fwrite (auxdata, 1, 16, outf) != 16) {
    ATOMS_RECOV_OUTPUT_WRITE_ERROR (err);
    goto fail;
  }

  /* now read the mdat data and output to the file */
  if (fseek (mdatrf->file, mdatrf->mdat_start +
          (mdatrf->rawfile ? 0 : mdatrf->mdat_header_size), SEEK_SET) != 0)
    goto fail;

  data = g_malloc (4096);
  while (!feof (mdatrf->file)) {
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
    gint read, write;

    read = fread (data, 1, 4096, mdatrf->file);
    write = fwrite (data, 1, read, outf);

    if (write != read) {
      g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE,
          "Failed to copy data to output file: %s", g_strerror (errno));
      goto fail;
    }
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
  }
  g_free (data);

  return TRUE;

fail:
  g_free (stbl_children);
  g_free (mvhd_data);
  g_free (prefix_data);
  g_free (trak_data);
  g_free (data);
  return FALSE;
}