gstreamer/ext/dash/gstisoff.c

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/*
* ISO File Format parsing library
*
* gstisoff.h
*
* Copyright (C) 2015 Samsung Electronics. All rights reserved.
* Author: Thiago Santos <thiagoss@osg.samsung.com>
*
* 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 2.1 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 (COPYING); if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "gstisoff.h"
#include <gst/base/gstbytereader.h>
#include <string.h>
/* gst_isoff_parse_box:
* @reader:
* @type: type that was found at the current position
* @extended_type: (allow-none): extended type if type=='uuid'
* @header_size: (allow-none): size of the box header (type, extended type and size)
* @size: size of the complete box including type, extended type and size
*
* Advances the byte reader to the start of the box content. To skip
* over the complete box, skip size - header_size bytes.
*
* Returns: TRUE if a box header could be parsed, FALSE if more data is needed
*/
gboolean
gst_isoff_parse_box_header (GstByteReader * reader, guint32 * type,
guint8 extended_type[16], guint * header_size, guint64 * size)
{
guint header_start_offset;
guint32 size_field;
header_start_offset = gst_byte_reader_get_pos (reader);
if (gst_byte_reader_get_remaining (reader) < 8)
goto not_enough_data;
size_field = gst_byte_reader_get_uint32_be_unchecked (reader);
*type = gst_byte_reader_get_uint32_le_unchecked (reader);
if (size_field == 1) {
if (gst_byte_reader_get_remaining (reader) < 8)
goto not_enough_data;
*size = gst_byte_reader_get_uint64_be_unchecked (reader);
} else {
*size = size_field;
}
if (*type == GST_ISOFF_FOURCC_UUID) {
if (gst_byte_reader_get_remaining (reader) < 16)
goto not_enough_data;
if (extended_type)
memcpy (extended_type, gst_byte_reader_get_data_unchecked (reader, 16),
16);
}
if (header_size)
*header_size = gst_byte_reader_get_pos (reader) - header_start_offset;
return TRUE;
not_enough_data:
gst_byte_reader_set_pos (reader, header_start_offset);
return FALSE;
}
static void
gst_isoff_trun_box_clear (GstTrunBox * trun)
{
if (trun->samples)
g_array_free (trun->samples, TRUE);
}
static void
gst_isoff_traf_box_clear (GstTrafBox * traf)
{
if (traf->trun)
g_array_free (traf->trun, TRUE);
}
static gboolean
gst_isoff_mfhd_box_parse (GstMfhdBox * mfhd, GstByteReader * reader)
{
guint8 version;
guint32 flags;
if (gst_byte_reader_get_remaining (reader) != 8)
return FALSE;
version = gst_byte_reader_get_uint8_unchecked (reader);
if (version != 0)
return FALSE;
flags = gst_byte_reader_get_uint24_be_unchecked (reader);
if (flags != 0)
return FALSE;
mfhd->sequence_number = gst_byte_reader_get_uint32_be_unchecked (reader);
return TRUE;
}
static gboolean
gst_isoff_tfhd_box_parse (GstTfhdBox * tfhd, GstByteReader * reader)
{
memset (tfhd, 0, sizeof (*tfhd));
if (gst_byte_reader_get_remaining (reader) < 4)
return FALSE;
tfhd->version = gst_byte_reader_get_uint8_unchecked (reader);
if (tfhd->version != 0)
return FALSE;
tfhd->flags = gst_byte_reader_get_uint24_be_unchecked (reader);
if (!gst_byte_reader_get_uint32_be (reader, &tfhd->track_id))
return FALSE;
if ((tfhd->flags & GST_TFHD_FLAGS_BASE_DATA_OFFSET_PRESENT) &&
!gst_byte_reader_get_uint64_be (reader, &tfhd->base_data_offset))
return FALSE;
if ((tfhd->flags & GST_TFHD_FLAGS_SAMPLE_DESCRIPTION_INDEX_PRESENT) &&
!gst_byte_reader_get_uint32_be (reader, &tfhd->sample_description_index))
return FALSE;
if ((tfhd->flags & GST_TFHD_FLAGS_DEFAULT_SAMPLE_DURATION_PRESENT) &&
!gst_byte_reader_get_uint32_be (reader, &tfhd->default_sample_duration))
return FALSE;
if ((tfhd->flags & GST_TFHD_FLAGS_DEFAULT_SAMPLE_SIZE_PRESENT) &&
!gst_byte_reader_get_uint32_be (reader, &tfhd->default_sample_size))
return FALSE;
if ((tfhd->flags & GST_TFHD_FLAGS_DEFAULT_SAMPLE_FLAGS_PRESENT) &&
!gst_byte_reader_get_uint32_be (reader, &tfhd->default_sample_flags))
return FALSE;
return TRUE;
}
static gboolean
gst_isoff_trun_box_parse (GstTrunBox * trun, GstByteReader * reader)
{
gint i;
memset (trun, 0, sizeof (*trun));
if (gst_byte_reader_get_remaining (reader) < 4)
return FALSE;
trun->version = gst_byte_reader_get_uint8_unchecked (reader);
if (trun->version != 0 && trun->version != 1)
return FALSE;
trun->flags = gst_byte_reader_get_uint24_be_unchecked (reader);
if (!gst_byte_reader_get_uint32_be (reader, &trun->sample_count))
return FALSE;
trun->samples =
g_array_sized_new (FALSE, FALSE, sizeof (GstTrunSample),
trun->sample_count);
if ((trun->flags & GST_TRUN_FLAGS_DATA_OFFSET_PRESENT) &&
!gst_byte_reader_get_uint32_be (reader, (guint32 *) & trun->data_offset))
return FALSE;
if ((trun->flags & GST_TRUN_FLAGS_FIRST_SAMPLE_FLAGS_PRESENT) &&
!gst_byte_reader_get_uint32_be (reader, &trun->first_sample_flags))
return FALSE;
for (i = 0; i < trun->sample_count; i++) {
GstTrunSample sample = { 0, };
if ((trun->flags & GST_TRUN_FLAGS_SAMPLE_DURATION_PRESENT) &&
!gst_byte_reader_get_uint32_be (reader, &sample.sample_duration))
goto error;
if ((trun->flags & GST_TRUN_FLAGS_SAMPLE_SIZE_PRESENT) &&
!gst_byte_reader_get_uint32_be (reader, &sample.sample_size))
goto error;
if ((trun->flags & GST_TRUN_FLAGS_SAMPLE_FLAGS_PRESENT) &&
!gst_byte_reader_get_uint32_be (reader, &sample.sample_flags))
goto error;
if ((trun->flags & GST_TRUN_FLAGS_SAMPLE_COMPOSITION_TIME_OFFSETS_PRESENT)
&& !gst_byte_reader_get_uint32_be (reader,
&sample.sample_composition_time_offset.u))
goto error;
g_array_append_val (trun->samples, sample);
}
return TRUE;
error:
gst_isoff_trun_box_clear (trun);
return FALSE;
}
static gboolean
gst_isoff_traf_box_parse (GstTrafBox * traf, GstByteReader * reader)
{
gboolean had_tfhd = FALSE;
memset (traf, 0, sizeof (*traf));
traf->trun = g_array_new (FALSE, FALSE, sizeof (GstTrunBox));
g_array_set_clear_func (traf->trun,
(GDestroyNotify) gst_isoff_trun_box_clear);
while (gst_byte_reader_get_remaining (reader) > 0) {
guint32 fourcc;
guint header_size;
guint64 size;
if (!gst_isoff_parse_box_header (reader, &fourcc, NULL, &header_size,
&size))
goto error;
if (gst_byte_reader_get_remaining (reader) < size - header_size)
goto error;
switch (fourcc) {
case GST_ISOFF_FOURCC_TFHD:{
GstByteReader sub_reader;
gst_byte_reader_get_sub_reader (reader, &sub_reader,
size - header_size);
if (!gst_isoff_tfhd_box_parse (&traf->tfhd, &sub_reader))
goto error;
had_tfhd = TRUE;
break;
}
case GST_ISOFF_FOURCC_TRUN:{
GstByteReader sub_reader;
GstTrunBox trun;
gst_byte_reader_get_sub_reader (reader, &sub_reader,
size - header_size);
if (!gst_isoff_trun_box_parse (&trun, &sub_reader))
goto error;
g_array_append_val (traf->trun, trun);
break;
}
default:
gst_byte_reader_skip (reader, size - header_size);
break;
}
}
if (!had_tfhd)
goto error;
return TRUE;
error:
gst_isoff_traf_box_clear (traf);
return FALSE;
}
GstMoofBox *
gst_isoff_moof_box_parse (GstByteReader * reader)
{
GstMoofBox *moof;
gboolean had_mfhd = FALSE;
moof = g_new0 (GstMoofBox, 1);
moof->traf = g_array_new (FALSE, FALSE, sizeof (GstTrafBox));
g_array_set_clear_func (moof->traf,
(GDestroyNotify) gst_isoff_traf_box_clear);
while (gst_byte_reader_get_remaining (reader) > 0) {
guint32 fourcc;
guint header_size;
guint64 size;
if (!gst_isoff_parse_box_header (reader, &fourcc, NULL, &header_size,
&size))
goto error;
if (gst_byte_reader_get_remaining (reader) < size - header_size)
goto error;
switch (fourcc) {
case GST_ISOFF_FOURCC_MFHD:{
GstByteReader sub_reader;
gst_byte_reader_get_sub_reader (reader, &sub_reader,
size - header_size);
if (!gst_isoff_mfhd_box_parse (&moof->mfhd, &sub_reader))
goto error;
had_mfhd = TRUE;
break;
}
case GST_ISOFF_FOURCC_TRAF:{
GstByteReader sub_reader;
GstTrafBox traf;
gst_byte_reader_get_sub_reader (reader, &sub_reader,
size - header_size);
if (!gst_isoff_traf_box_parse (&traf, &sub_reader))
goto error;
g_array_append_val (moof->traf, traf);
break;
}
default:
gst_byte_reader_skip (reader, size - header_size);
break;
}
}
if (!had_mfhd)
goto error;
return moof;
error:
gst_isoff_moof_box_free (moof);
return NULL;
}
void
gst_isoff_moof_box_free (GstMoofBox * moof)
{
g_array_free (moof->traf, TRUE);
g_free (moof);
}
void
gst_isoff_sidx_parser_init (GstSidxParser * parser)
{
parser->status = GST_ISOFF_SIDX_PARSER_INIT;
parser->cumulative_entry_size = 0;
parser->sidx.entries = NULL;
parser->sidx.entries_count = 0;
}
void
gst_isoff_sidx_parser_clear (GstSidxParser * parser)
{
g_free (parser->sidx.entries);
parser->sidx.entries = NULL;
}
static void
gst_isoff_parse_sidx_entry (GstSidxBoxEntry * entry, GstByteReader * reader)
{
guint32 aux;
aux = gst_byte_reader_get_uint32_be_unchecked (reader);
entry->ref_type = aux >> 31;
entry->size = aux & 0x7FFFFFFF;
entry->duration = gst_byte_reader_get_uint32_be_unchecked (reader);
aux = gst_byte_reader_get_uint32_be_unchecked (reader);
entry->starts_with_sap = aux >> 31;
entry->sap_type = ((aux >> 28) & 0x7);
entry->sap_delta_time = aux & 0xFFFFFFF;
}
GstIsoffParserResult
gst_isoff_sidx_parser_add_buffer (GstSidxParser * parser, GstBuffer * buffer,
guint * consumed)
{
GstIsoffParserResult res = GST_ISOFF_PARSER_OK;
GstByteReader reader;
GstMapInfo info;
gsize remaining;
guint32 fourcc;
if (!gst_buffer_map (buffer, &info, GST_MAP_READ)) {
*consumed = 0;
return GST_ISOFF_PARSER_ERROR;
}
gst_byte_reader_init (&reader, info.data, info.size);
switch (parser->status) {
case GST_ISOFF_SIDX_PARSER_INIT:
if (!gst_isoff_parse_box_header (&reader, &fourcc, NULL, NULL,
&parser->size))
break;
if (fourcc != GST_ISOFF_FOURCC_SIDX) {
res = GST_ISOFF_PARSER_UNEXPECTED;
gst_byte_reader_set_pos (&reader, 0);
break;
}
if (parser->size == 0) {
res = GST_ISOFF_PARSER_ERROR;
gst_byte_reader_set_pos (&reader, 0);
break;
}
/* Try again once we have enough data for the FullBox header */
if (gst_byte_reader_get_remaining (&reader) < 4) {
gst_byte_reader_set_pos (&reader, 0);
break;
}
parser->sidx.version = gst_byte_reader_get_uint8_unchecked (&reader);
parser->sidx.flags = gst_byte_reader_get_uint24_le_unchecked (&reader);
parser->status = GST_ISOFF_SIDX_PARSER_HEADER;
case GST_ISOFF_SIDX_PARSER_HEADER:
remaining = gst_byte_reader_get_remaining (&reader);
if (remaining < 12 + (parser->sidx.version == 0 ? 8 : 16)) {
break;
}
parser->sidx.ref_id = gst_byte_reader_get_uint32_be_unchecked (&reader);
parser->sidx.timescale =
gst_byte_reader_get_uint32_be_unchecked (&reader);
if (parser->sidx.version == 0) {
parser->sidx.earliest_pts =
gst_byte_reader_get_uint32_be_unchecked (&reader);
parser->sidx.first_offset =
gst_byte_reader_get_uint32_be_unchecked (&reader);
} else {
parser->sidx.earliest_pts =
gst_byte_reader_get_uint64_be_unchecked (&reader);
parser->sidx.first_offset =
gst_byte_reader_get_uint64_be_unchecked (&reader);
}
/* skip 2 reserved bytes */
gst_byte_reader_skip_unchecked (&reader, 2);
parser->sidx.entries_count =
gst_byte_reader_get_uint16_be_unchecked (&reader);
GST_LOG ("Timescale: %" G_GUINT32_FORMAT, parser->sidx.timescale);
GST_LOG ("Earliest pts: %" G_GUINT64_FORMAT, parser->sidx.earliest_pts);
GST_LOG ("First offset: %" G_GUINT64_FORMAT, parser->sidx.first_offset);
parser->cumulative_pts =
gst_util_uint64_scale_int_round (parser->sidx.earliest_pts,
GST_SECOND, parser->sidx.timescale);
if (parser->sidx.entries_count) {
parser->sidx.entries =
g_malloc (sizeof (GstSidxBoxEntry) * parser->sidx.entries_count);
}
parser->sidx.entry_index = 0;
parser->status = GST_ISOFF_SIDX_PARSER_DATA;
case GST_ISOFF_SIDX_PARSER_DATA:
while (parser->sidx.entry_index < parser->sidx.entries_count) {
GstSidxBoxEntry *entry =
&parser->sidx.entries[parser->sidx.entry_index];
remaining = gst_byte_reader_get_remaining (&reader);
if (remaining < 12)
break;
entry->offset = parser->cumulative_entry_size;
entry->pts = parser->cumulative_pts;
gst_isoff_parse_sidx_entry (entry, &reader);
entry->duration = gst_util_uint64_scale_int_round (entry->duration,
GST_SECOND, parser->sidx.timescale);
parser->cumulative_entry_size += entry->size;
parser->cumulative_pts += entry->duration;
GST_LOG ("Sidx entry %d) offset: %" G_GUINT64_FORMAT ", pts: %"
GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT " - size %"
G_GUINT32_FORMAT, parser->sidx.entry_index, entry->offset,
GST_TIME_ARGS (entry->pts), GST_TIME_ARGS (entry->duration),
entry->size);
parser->sidx.entry_index++;
}
if (parser->sidx.entry_index == parser->sidx.entries_count)
parser->status = GST_ISOFF_SIDX_PARSER_FINISHED;
else
break;
case GST_ISOFF_SIDX_PARSER_FINISHED:
parser->sidx.entry_index = 0;
res = GST_ISOFF_PARSER_DONE;
break;
}
*consumed = gst_byte_reader_get_pos (&reader);
gst_buffer_unmap (buffer, &info);
return res;
}