94 lines
2.9 KiB
C++
94 lines
2.9 KiB
C++
// Copyright 2020 Google LLC. 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/base/text_muxer.h"
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#include "packager/media/base/muxer_util.h"
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#include "packager/status_macros.h"
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namespace shaka {
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namespace media {
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TextMuxer::TextMuxer(const MuxerOptions& options) : Muxer(options) {}
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TextMuxer::~TextMuxer() {}
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Status TextMuxer::InitializeMuxer() {
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if (streams().size() != 1 || streams()[0]->stream_type() != kStreamText) {
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return Status(error::MUXER_FAILURE,
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"Incorrect streams given to WebVTT muxer");
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}
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auto copy = streams()[0]->Clone();
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RETURN_IF_ERROR(InitializeStream(static_cast<TextStreamInfo*>(copy.get())));
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muxer_listener()->OnMediaStart(options(), *copy, copy->time_scale(),
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MuxerListener::kContainerText);
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last_cue_ms_ = 0;
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return Status::OK;
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}
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Status TextMuxer::Finalize() {
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const float duration_ms = static_cast<float>(total_duration_ms_);
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float duration_seconds = duration_ms / 1000;
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// If we haven't seen any segments, this is a single-file. In this case,
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// flush the single segment.
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MuxerListener::MediaRanges ranges;
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if (duration_seconds == 0 && last_cue_ms_ != 0) {
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DCHECK(options().segment_template.empty());
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duration_seconds = static_cast<float>(last_cue_ms_) / 1000;
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uint64_t size;
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RETURN_IF_ERROR(WriteToFile(options().output_file_name, &size));
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// Insert a dummy value so the HLS generator will generate a segment list.
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ranges.subsegment_ranges.emplace_back();
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muxer_listener()->OnNewSegment(
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options().output_file_name, 0,
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duration_seconds * streams()[0]->time_scale(), size);
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}
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muxer_listener()->OnMediaEnd(ranges, duration_seconds);
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return Status::OK;
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}
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Status TextMuxer::AddTextSample(size_t stream_id, const TextSample& sample) {
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// Ignore sync samples.
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if (sample.body().is_empty()) {
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return Status::OK;
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}
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RETURN_IF_ERROR(AddTextSampleInternal(sample));
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last_cue_ms_ = sample.EndTime();
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return Status::OK;
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}
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Status TextMuxer::FinalizeSegment(size_t stream_id,
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const SegmentInfo& segment_info) {
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total_duration_ms_ += segment_info.duration;
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const std::string& segment_template = options().segment_template;
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DCHECK(!segment_template.empty());
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const uint32_t index = segment_index_++;
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const uint64_t start = segment_info.start_timestamp;
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const uint64_t duration = segment_info.duration;
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const uint32_t bandwidth = options().bandwidth;
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const std::string filename =
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GetSegmentName(segment_template, start, index, bandwidth);
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uint64_t size;
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RETURN_IF_ERROR(WriteToFile(filename, &size));
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muxer_listener()->OnNewSegment(filename, start, duration, size);
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return Status::OK;
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}
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} // namespace media
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} // namespace shaka
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