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Diffstat (limited to 'gst/isomp4/atomsrecovery.c')
| -rw-r--r-- | gst/isomp4/atomsrecovery.c | 1104 |
1 files changed, 1104 insertions, 0 deletions
diff --git a/gst/isomp4/atomsrecovery.c b/gst/isomp4/atomsrecovery.c new file mode 100644 index 0000000..1d53ed8 --- /dev/null +++ b/gst/isomp4/atomsrecovery.c @@ -0,0 +1,1104 @@ +/* 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 + * Free Software Foundation, Inc., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ +/* + * 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. + */ + +/** + * 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! + * + * 3) gst-launch qtmoovrecover recovery-input=path.mrf broken-input=moovie.mov \ + 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) { + if (fwrite (GST_BUFFER_DATA (prefix), 1, GST_BUFFER_SIZE (prefix), f) != + GST_BUFFER_SIZE (prefix)) { + return FALSE; + } + } + if (!atom_ftyp_copy_data (ftyp, &data, &size, &offset)) { + return FALSE; + } + if (fwrite (data, 1, offset, f) != offset) { + g_free (data); + return FALSE; + } + g_free (data); + return TRUE; +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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; +} + +/** + * 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; +} + +MdatRecovFile * +mdat_recov_file_create (FILE * file, gboolean datafile, GError ** err) +{ + MdatRecovFile *mrf = g_new0 (MdatRecovFile, 1); + guint32 fourcc, size; + + 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; + } + + if (!read_atom_header (file, &fourcc, &size)) { + goto parse_error; + } + if (fourcc != FOURCC_ftyp) { + /* this could be a prefix atom, let's skip it and try again */ + if (fseek (file, size - 8, SEEK_CUR) != 0) { + goto file_seek_error; + } + if (!read_atom_header (file, &fourcc, &size)) { + goto parse_error; + } + } + + if (fourcc != FOURCC_ftyp) { + goto parse_error; + } + if (fseek (file, size - 8, SEEK_CUR) != 0) + goto file_seek_error; + + /* 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; + +parse_error: + g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_FILE, + "Failed to parse atom"); + goto fail; + +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 */ + fseek (moovrf->file, 68, SEEK_CUR); + + 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; + + 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; + } + + /* sanity check */ + if (moovrf->num_traks > 1024) { + g_set_error (err, ATOMS_RECOV_QUARK, ATOMS_RECOV_ERR_PARSING, + "Unsupported number of traks"); + goto fail; + } + + /* 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, + b->chunk_offset, b->sync, b->pts_offset); +} + +/** + * 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; +} + +static guint32 +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; +} + +static guint8 * +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; +} + +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; + atom_stco64_chunks_add_offset (&trak->stbl.stco64, offset); + } + + /* 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; + } + g_free (trak_data); + trak_data = NULL; + g_free (stbl_children); + stbl_children = NULL; + } + + /* 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)) { + 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; + } + } + 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; +} |