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f5b98f24c2
Allows dashdemux to identify the subsegments in the stream and switch bitrates when needed
187 lines
6.2 KiB
C
187 lines
6.2 KiB
C
/*
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* ISO File Format parsing library
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*
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* gstisoff.h
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*
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* Copyright (C) 2015 Samsung Electronics. All rights reserved.
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* Author: Thiago Santos <thiagoss@osg.samsung.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library (COPYING); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "gstisoff.h"
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#include <gst/base/gstbytereader.h>
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void
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gst_isoff_sidx_parser_init (GstSidxParser * parser)
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{
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parser->status = GST_ISOFF_SIDX_PARSER_INIT;
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parser->cumulative_entry_size = 0;
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parser->sidx.entries = NULL;
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parser->sidx.entries_count = 0;
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}
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void
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gst_isoff_sidx_parser_clear (GstSidxParser * parser)
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{
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g_free (parser->sidx.entries);
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parser->sidx.entries = NULL;
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}
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static void
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gst_isoff_parse_sidx_entry (GstSidxBoxEntry * entry, GstByteReader * reader)
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{
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guint32 aux;
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aux = gst_byte_reader_get_uint32_be_unchecked (reader);
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entry->ref_type = aux >> 31;
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entry->size = aux & 0x7FFFFFFF;
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entry->duration = gst_byte_reader_get_uint32_be_unchecked (reader);
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aux = gst_byte_reader_get_uint32_be_unchecked (reader);
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entry->starts_with_sap = aux >> 31;
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entry->sap_type = ((aux >> 28) & 0x7);
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entry->sap_delta_time = aux & 0xFFFFFFF;
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}
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GstIsoffParserResult
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gst_isoff_sidx_parser_add_buffer (GstSidxParser * parser, GstBuffer * buffer,
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guint * consumed)
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{
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GstIsoffParserResult res = GST_ISOFF_PARSER_OK;
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GstByteReader reader;
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GstMapInfo info;
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gsize remaining;
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guint32 fourcc;
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if (!gst_buffer_map (buffer, &info, GST_MAP_READ)) {
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*consumed = 0;
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return GST_ISOFF_PARSER_ERROR;
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}
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gst_byte_reader_init (&reader, info.data, info.size);
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switch (parser->status) {
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case GST_ISOFF_SIDX_PARSER_INIT:
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if (gst_byte_reader_get_remaining (&reader) < GST_ISOFF_FULL_BOX_SIZE) {
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break;
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}
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parser->size = gst_byte_reader_get_uint32_be_unchecked (&reader);
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fourcc = gst_byte_reader_get_uint32_le_unchecked (&reader);
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if (fourcc != GST_ISOFF_FOURCC_SIDX) {
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res = GST_ISOFF_PARSER_UNEXPECTED;
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gst_byte_reader_set_pos (&reader, 0);
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break;
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}
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if (parser->size == 1) {
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if (gst_byte_reader_get_remaining (&reader) < 12) {
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gst_byte_reader_set_pos (&reader, 0);
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break;
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}
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parser->size = gst_byte_reader_get_uint64_be_unchecked (&reader);
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}
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if (parser->size == 0) {
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res = GST_ISOFF_PARSER_ERROR;
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gst_byte_reader_set_pos (&reader, 0);
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break;
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}
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parser->sidx.version = gst_byte_reader_get_uint8_unchecked (&reader);
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parser->sidx.flags = gst_byte_reader_get_uint24_le_unchecked (&reader);
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parser->status = GST_ISOFF_SIDX_PARSER_HEADER;
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case GST_ISOFF_SIDX_PARSER_HEADER:
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remaining = gst_byte_reader_get_remaining (&reader);
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if (remaining < 12 + (parser->sidx.version == 0 ? 8 : 16)) {
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break;
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}
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parser->sidx.ref_id = gst_byte_reader_get_uint32_be_unchecked (&reader);
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parser->sidx.timescale =
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gst_byte_reader_get_uint32_be_unchecked (&reader);
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if (parser->sidx.version == 0) {
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parser->sidx.earliest_pts =
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gst_byte_reader_get_uint32_be_unchecked (&reader);
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parser->sidx.first_offset = parser->sidx.earliest_pts =
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gst_byte_reader_get_uint32_be_unchecked (&reader);
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} else {
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parser->sidx.earliest_pts =
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gst_byte_reader_get_uint64_be_unchecked (&reader);
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parser->sidx.first_offset =
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gst_byte_reader_get_uint64_be_unchecked (&reader);
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}
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/* skip 2 reserved bytes */
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gst_byte_reader_skip_unchecked (&reader, 2);
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parser->sidx.entries_count =
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gst_byte_reader_get_uint16_be_unchecked (&reader);
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GST_LOG ("Timescale: %" G_GUINT32_FORMAT, parser->sidx.timescale);
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GST_LOG ("Earliest pts: %" G_GUINT64_FORMAT, parser->sidx.earliest_pts);
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GST_LOG ("First offset: %" G_GUINT64_FORMAT, parser->sidx.first_offset);
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parser->cumulative_pts =
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gst_util_uint64_scale_int_round (parser->sidx.earliest_pts,
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GST_SECOND, parser->sidx.timescale);
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if (parser->sidx.entries_count) {
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parser->sidx.entries =
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g_malloc (sizeof (GstSidxBoxEntry) * parser->sidx.entries_count);
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}
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parser->sidx.entry_index = 0;
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parser->status = GST_ISOFF_SIDX_PARSER_DATA;
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case GST_ISOFF_SIDX_PARSER_DATA:
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while (parser->sidx.entry_index < parser->sidx.entries_count) {
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GstSidxBoxEntry *entry =
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&parser->sidx.entries[parser->sidx.entry_index];
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remaining = gst_byte_reader_get_remaining (&reader);;
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if (remaining < 12)
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break;
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entry->offset = parser->cumulative_entry_size;
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entry->pts = parser->cumulative_pts;
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gst_isoff_parse_sidx_entry (entry, &reader);
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entry->duration = gst_util_uint64_scale_int_round (entry->duration,
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GST_SECOND, parser->sidx.timescale);
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parser->cumulative_entry_size += entry->size;
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parser->cumulative_pts += entry->duration;
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GST_LOG ("Sidx entry %d) offset: %" G_GUINT64_FORMAT ", pts: %"
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GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT " - size %"
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G_GUINT32_FORMAT, parser->sidx.entry_index, entry->offset,
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GST_TIME_ARGS (entry->pts), GST_TIME_ARGS (entry->duration),
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entry->size);
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parser->sidx.entry_index++;
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}
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if (parser->sidx.entry_index == parser->sidx.entries_count)
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parser->status = GST_ISOFF_SIDX_PARSER_FINISHED;
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else
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break;
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case GST_ISOFF_SIDX_PARSER_FINISHED:
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parser->sidx.entry_index = 0;
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res = GST_ISOFF_PARSER_DONE;
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break;
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}
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*consumed = gst_byte_reader_get_pos (&reader);
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gst_buffer_unmap (buffer, &info);
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return res;
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}
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