398 lines
13 KiB
C++
398 lines
13 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "packager/media/formats/webm/tracks_builder.h"
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#include "packager/base/logging.h"
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#include "packager/media/formats/webm/webm_constants.h"
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namespace shaka {
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namespace media {
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// Returns size of an integer, formatted using Matroska serialization.
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static int GetUIntMkvSize(uint64_t value) {
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if (value < 0x07FULL)
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return 1;
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if (value < 0x03FFFULL)
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return 2;
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if (value < 0x01FFFFFULL)
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return 3;
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if (value < 0x0FFFFFFFULL)
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return 4;
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if (value < 0x07FFFFFFFFULL)
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return 5;
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if (value < 0x03FFFFFFFFFFULL)
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return 6;
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if (value < 0x01FFFFFFFFFFFFULL)
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return 7;
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return 8;
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}
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// Returns the minimium size required to serialize an integer value.
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static int GetUIntSize(uint64_t value) {
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if (value < 0x0100ULL)
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return 1;
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if (value < 0x010000ULL)
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return 2;
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if (value < 0x01000000ULL)
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return 3;
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if (value < 0x0100000000ULL)
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return 4;
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if (value < 0x010000000000ULL)
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return 5;
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if (value < 0x01000000000000ULL)
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return 6;
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if (value < 0x0100000000000000ULL)
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return 7;
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return 8;
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}
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static int MasterElementSize(int element_id, int payload_size) {
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return GetUIntSize(element_id) + GetUIntMkvSize(payload_size) + payload_size;
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}
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static int UIntElementSize(int element_id, uint64_t value) {
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return GetUIntSize(element_id) + 1 + GetUIntSize(value);
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}
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static int DoubleElementSize(int element_id) {
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return GetUIntSize(element_id) + 1 + 8;
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}
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static int StringElementSize(int element_id, const std::string& value) {
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return GetUIntSize(element_id) +
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GetUIntMkvSize(value.length()) +
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value.length();
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}
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static void SerializeInt(uint8_t** buf_ptr,
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int* buf_size_ptr,
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int64_t value,
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int size) {
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uint8_t*& buf = *buf_ptr;
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int& buf_size = *buf_size_ptr;
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for (int idx = 1; idx <= size; ++idx) {
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*buf++ = static_cast<uint8_t>(value >> ((size - idx) * 8));
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--buf_size;
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}
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}
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static void SerializeDouble(uint8_t** buf_ptr,
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int* buf_size_ptr,
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double value) {
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// Use a union to convert |value| to native endian integer bit pattern.
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union {
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double src;
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int64_t dst;
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} tmp;
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tmp.src = value;
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// Write the bytes from native endian |tmp.dst| to big-endian form in |buf|.
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SerializeInt(buf_ptr, buf_size_ptr, tmp.dst, 8);
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}
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static void WriteElementId(uint8_t** buf, int* buf_size, int element_id) {
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SerializeInt(buf, buf_size, element_id, GetUIntSize(element_id));
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}
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static void WriteUInt(uint8_t** buf, int* buf_size, uint64_t value) {
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const int size = GetUIntMkvSize(value);
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value |= (1ULL << (size * 7)); // Matroska formatting
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SerializeInt(buf, buf_size, value, size);
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}
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static void WriteMasterElement(uint8_t** buf,
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int* buf_size,
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int element_id,
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int payload_size) {
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WriteElementId(buf, buf_size, element_id);
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WriteUInt(buf, buf_size, payload_size);
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}
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static void WriteUIntElement(uint8_t** buf,
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int* buf_size,
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int element_id,
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uint64_t value) {
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WriteElementId(buf, buf_size, element_id);
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const int size = GetUIntSize(value);
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WriteUInt(buf, buf_size, size);
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SerializeInt(buf, buf_size, value, size);
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}
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static void WriteDoubleElement(uint8_t** buf,
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int* buf_size,
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int element_id,
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double value) {
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WriteElementId(buf, buf_size, element_id);
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WriteUInt(buf, buf_size, 8);
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SerializeDouble(buf, buf_size, value);
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}
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static void WriteStringElement(uint8_t** buf_ptr,
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int* buf_size_ptr,
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int element_id,
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const std::string& value) {
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uint8_t*& buf = *buf_ptr;
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int& buf_size = *buf_size_ptr;
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WriteElementId(&buf, &buf_size, element_id);
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const uint64_t size = value.length();
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WriteUInt(&buf, &buf_size, size);
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memcpy(buf, value.data(), size);
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buf += size;
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buf_size -= size;
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}
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TracksBuilder::TracksBuilder(bool allow_invalid_values)
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: allow_invalid_values_(allow_invalid_values) {}
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TracksBuilder::TracksBuilder()
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: allow_invalid_values_(false) {}
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TracksBuilder::~TracksBuilder() {}
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void TracksBuilder::AddVideoTrack(int track_num,
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uint64_t track_uid,
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const std::string& codec_id,
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const std::string& name,
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const std::string& language,
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int default_duration,
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int video_pixel_width,
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int video_pixel_height) {
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AddTrackInternal(track_num, kWebMTrackTypeVideo, track_uid, codec_id, name,
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language, default_duration, video_pixel_width,
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video_pixel_height, -1, -1);
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}
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void TracksBuilder::AddAudioTrack(int track_num,
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uint64_t track_uid,
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const std::string& codec_id,
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const std::string& name,
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const std::string& language,
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int default_duration,
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int audio_channels,
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double audio_sampling_frequency) {
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AddTrackInternal(track_num, kWebMTrackTypeAudio, track_uid, codec_id, name,
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language, default_duration, -1, -1, audio_channels,
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audio_sampling_frequency);
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}
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void TracksBuilder::AddTextTrack(int track_num,
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uint64_t track_uid,
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const std::string& codec_id,
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const std::string& name,
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const std::string& language) {
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AddTrackInternal(track_num, kWebMTrackTypeSubtitlesOrCaptions, track_uid,
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codec_id, name, language, -1, -1, -1, -1, -1);
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}
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std::vector<uint8_t> TracksBuilder::Finish() {
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// Allocate the storage
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std::vector<uint8_t> buffer;
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buffer.resize(GetTracksSize());
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// Populate the storage with a tracks header
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WriteTracks(&buffer[0], buffer.size());
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return buffer;
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}
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void TracksBuilder::AddTrackInternal(int track_num,
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int track_type,
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uint64_t track_uid,
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const std::string& codec_id,
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const std::string& name,
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const std::string& language,
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int default_duration,
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int video_pixel_width,
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int video_pixel_height,
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int audio_channels,
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double audio_sampling_frequency) {
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tracks_.push_back(Track(track_num, track_type, track_uid, codec_id, name,
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language, default_duration, video_pixel_width,
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video_pixel_height, audio_channels,
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audio_sampling_frequency, allow_invalid_values_));
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}
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int TracksBuilder::GetTracksSize() const {
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return MasterElementSize(kWebMIdTracks, GetTracksPayloadSize());
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}
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int TracksBuilder::GetTracksPayloadSize() const {
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int payload_size = 0;
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for (TrackList::const_iterator itr = tracks_.begin();
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itr != tracks_.end(); ++itr) {
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payload_size += itr->GetSize();
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}
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return payload_size;
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}
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void TracksBuilder::WriteTracks(uint8_t* buf, int buf_size) const {
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WriteMasterElement(&buf, &buf_size, kWebMIdTracks, GetTracksPayloadSize());
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for (TrackList::const_iterator itr = tracks_.begin();
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itr != tracks_.end(); ++itr) {
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itr->Write(&buf, &buf_size);
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}
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}
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TracksBuilder::Track::Track(int track_num,
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int track_type,
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uint64_t track_uid,
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const std::string& codec_id,
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const std::string& name,
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const std::string& language,
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int default_duration,
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int video_pixel_width,
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int video_pixel_height,
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int audio_channels,
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double audio_sampling_frequency,
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bool allow_invalid_values)
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: track_num_(track_num),
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track_type_(track_type),
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track_uid_(track_uid),
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codec_id_(codec_id),
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name_(name),
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language_(language),
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default_duration_(default_duration),
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video_pixel_width_(video_pixel_width),
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video_pixel_height_(video_pixel_height),
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audio_channels_(audio_channels),
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audio_sampling_frequency_(audio_sampling_frequency) {
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if (!allow_invalid_values) {
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CHECK_GT(track_num_, 0);
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CHECK_GT(track_type_, 0);
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CHECK_LT(track_type_, 255);
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CHECK_GT(track_uid_, 0);
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if (track_type != kWebMTrackTypeVideo &&
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track_type != kWebMTrackTypeAudio) {
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CHECK_EQ(default_duration_, -1);
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} else {
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CHECK(default_duration_ == -1 || default_duration_ > 0);
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}
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if (track_type == kWebMTrackTypeVideo) {
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CHECK_GT(video_pixel_width_, 0);
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CHECK_GT(video_pixel_height_, 0);
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} else {
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CHECK_EQ(video_pixel_width_, -1);
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CHECK_EQ(video_pixel_height_, -1);
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}
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if (track_type == kWebMTrackTypeAudio) {
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CHECK_GT(audio_channels_, 0);
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CHECK_GT(audio_sampling_frequency_, 0.0);
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} else {
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CHECK_EQ(audio_channels_, -1);
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CHECK_EQ(audio_sampling_frequency_, -1.0);
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}
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}
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}
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int TracksBuilder::Track::GetSize() const {
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return MasterElementSize(kWebMIdTrackEntry, GetPayloadSize());
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}
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int TracksBuilder::Track::GetVideoPayloadSize() const {
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int payload_size = 0;
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if (video_pixel_width_ >= 0)
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payload_size += UIntElementSize(kWebMIdPixelWidth, video_pixel_width_);
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if (video_pixel_height_ >= 0)
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payload_size += UIntElementSize(kWebMIdPixelHeight, video_pixel_height_);
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return payload_size;
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}
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int TracksBuilder::Track::GetAudioPayloadSize() const {
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int payload_size = 0;
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if (audio_channels_ >= 0)
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payload_size += UIntElementSize(kWebMIdChannels, audio_channels_);
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if (audio_sampling_frequency_ >= 0)
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payload_size += DoubleElementSize(kWebMIdSamplingFrequency);
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return payload_size;
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}
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int TracksBuilder::Track::GetPayloadSize() const {
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int size = 0;
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size += UIntElementSize(kWebMIdTrackNumber, track_num_);
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size += UIntElementSize(kWebMIdTrackType, track_type_);
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size += UIntElementSize(kWebMIdTrackUID, track_uid_);
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if (default_duration_ >= 0)
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size += UIntElementSize(kWebMIdDefaultDuration, default_duration_);
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if (!codec_id_.empty())
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size += StringElementSize(kWebMIdCodecID, codec_id_);
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if (!name_.empty())
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size += StringElementSize(kWebMIdName, name_);
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if (!language_.empty())
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size += StringElementSize(kWebMIdLanguage, language_);
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if (GetVideoPayloadSize() > 0) {
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size += MasterElementSize(kWebMIdVideo, GetVideoPayloadSize());
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}
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if (GetAudioPayloadSize() > 0) {
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size += MasterElementSize(kWebMIdAudio, GetAudioPayloadSize());
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}
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return size;
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}
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void TracksBuilder::Track::Write(uint8_t** buf, int* buf_size) const {
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WriteMasterElement(buf, buf_size, kWebMIdTrackEntry, GetPayloadSize());
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WriteUIntElement(buf, buf_size, kWebMIdTrackNumber, track_num_);
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WriteUIntElement(buf, buf_size, kWebMIdTrackType, track_type_);
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WriteUIntElement(buf, buf_size, kWebMIdTrackUID, track_uid_);
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if (default_duration_ >= 0)
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WriteUIntElement(buf, buf_size, kWebMIdDefaultDuration, default_duration_);
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if (!codec_id_.empty())
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WriteStringElement(buf, buf_size, kWebMIdCodecID, codec_id_);
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if (!name_.empty())
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WriteStringElement(buf, buf_size, kWebMIdName, name_);
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if (!language_.empty())
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WriteStringElement(buf, buf_size, kWebMIdLanguage, language_);
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if (GetVideoPayloadSize() > 0) {
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WriteMasterElement(buf, buf_size, kWebMIdVideo, GetVideoPayloadSize());
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if (video_pixel_width_ >= 0)
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WriteUIntElement(buf, buf_size, kWebMIdPixelWidth, video_pixel_width_);
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if (video_pixel_height_ >= 0)
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WriteUIntElement(buf, buf_size, kWebMIdPixelHeight, video_pixel_height_);
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}
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if (GetAudioPayloadSize() > 0) {
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WriteMasterElement(buf, buf_size, kWebMIdAudio, GetAudioPayloadSize());
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if (audio_channels_ >= 0)
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WriteUIntElement(buf, buf_size, kWebMIdChannels, audio_channels_);
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if (audio_sampling_frequency_ >= 0) {
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WriteDoubleElement(buf, buf_size, kWebMIdSamplingFrequency,
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audio_sampling_frequency_);
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}
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}
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}
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} // namespace media
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} // namespace shaka
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