95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
// Copyright 2020 Google Inc. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd
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#include "packager/media/formats/mp2t/es_parser_dvb.h"
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#include "packager/media/base/bit_reader.h"
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#include "packager/media/base/text_stream_info.h"
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#include "packager/media/base/timestamp.h"
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#include "packager/media/formats/mp2t/mp2t_common.h"
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namespace shaka {
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namespace media {
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namespace mp2t {
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EsParserDvb::EsParserDvb(uint32_t pid,
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const NewStreamInfoCB& new_stream_info_cb,
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const EmitTextSampleCB& emit_sample_cb)
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: EsParser(pid),
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new_stream_info_cb_(new_stream_info_cb),
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emit_sample_cb_(emit_sample_cb) {}
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EsParserDvb::~EsParserDvb() {}
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bool EsParserDvb::Parse(const uint8_t* buf,
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int size,
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int64_t pts,
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int64_t dts) {
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if (!sent_info_) {
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sent_info_ = true;
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std::shared_ptr<StreamInfo> info = std::make_shared<TextStreamInfo>(
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pid(), kMpeg2Timescale, kInfiniteDuration, kCodecText,
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/* codec_string= */ "", /* codec_config= */ "", /* width= */ 0,
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/* height= */ 0, /* language= */ "");
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new_stream_info_cb_.Run(info);
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}
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// TODO: Handle buffering and multiple reads? All content so far has been
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// a whole segment, so it may not be needed.
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return ParseInternal(buf, size, pts);
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}
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bool EsParserDvb::Flush() {
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for (auto& pair : parsers_) {
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std::vector<std::shared_ptr<TextSample>> samples;
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RCHECK(pair.second.Flush(&samples));
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for (auto sample : samples)
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emit_sample_cb_.Run(sample);
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}
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return true;
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}
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void EsParserDvb::Reset() {
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parsers_.clear();
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}
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bool EsParserDvb::ParseInternal(const uint8_t* data, size_t size, int64_t pts) {
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// See EN 300 743 Table 3.
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BitReader reader(data, size);
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int data_identifier;
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int subtitle_stream_id;
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RCHECK(reader.ReadBits(8, &data_identifier));
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RCHECK(reader.ReadBits(8, &subtitle_stream_id));
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RCHECK(data_identifier == 0x20);
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RCHECK(subtitle_stream_id == 0);
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int temp;
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while (reader.ReadBits(8, &temp) && temp == 0xf) {
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DvbSubSegmentType segment_type;
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uint16_t page_id;
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size_t segment_length;
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RCHECK(reader.ReadBits(8, &segment_type));
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RCHECK(reader.ReadBits(16, &page_id));
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RCHECK(reader.ReadBits(16, &segment_length));
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RCHECK(reader.bits_available() > segment_length * 8);
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const uint8_t* payload = data + (size - reader.bits_available() / 8);
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std::vector<std::shared_ptr<TextSample>> samples;
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RCHECK(parsers_[page_id].Parse(segment_type, pts, payload, segment_length,
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&samples));
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for (auto sample : samples)
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emit_sample_cb_.Run(sample);
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RCHECK(reader.SkipBytes(segment_length));
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}
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return temp == 0xff;
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}
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} // namespace mp2t
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} // namespace media
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} // namespace shaka
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