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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "playbackengine/qffmpegmediadataholder_p.h"
#include "qffmpegmediametadata_p.h"
#include "qffmpegmediaformatinfo_p.h"
#include "qiodevice.h"
QT_BEGIN_NAMESPACE
namespace QFFmpeg::PlaybackEngineInternal {
static void insertMediaData(QMediaMetaData &metaData, QPlatformMediaPlayer::TrackType trackType,
const AVStream *stream)
{
Q_ASSERT(stream);
const auto *codecPar = stream->codecpar;
switch (trackType) {
case QPlatformMediaPlayer::VideoStream:
metaData.insert(QMediaMetaData::VideoBitRate, (int)codecPar->bit_rate);
metaData.insert(QMediaMetaData::VideoCodec,
QVariant::fromValue(QFFmpegMediaFormatInfo::videoCodecForAVCodecId(
codecPar->codec_id)));
metaData.insert(QMediaMetaData::Resolution, QSize(codecPar->width, codecPar->height));
metaData.insert(QMediaMetaData::VideoFrameRate,
qreal(stream->avg_frame_rate.num) / qreal(stream->avg_frame_rate.den));
break;
case QPlatformMediaPlayer::AudioStream:
metaData.insert(QMediaMetaData::AudioBitRate, (int)codecPar->bit_rate);
metaData.insert(QMediaMetaData::AudioCodec,
QVariant::fromValue(QFFmpegMediaFormatInfo::audioCodecForAVCodecId(
codecPar->codec_id)));
break;
default:
break;
}
};
static int readQIODevice(void *opaque, uint8_t *buf, int buf_size)
{
auto *dev = static_cast<QIODevice *>(opaque);
if (dev->atEnd())
return AVERROR_EOF;
return dev->read(reinterpret_cast<char *>(buf), buf_size);
}
static int64_t seekQIODevice(void *opaque, int64_t offset, int whence)
{
QIODevice *dev = static_cast<QIODevice *>(opaque);
if (dev->isSequential())
return AVERROR(EINVAL);
if (whence & AVSEEK_SIZE)
return dev->size();
whence &= ~AVSEEK_FORCE;
if (whence == SEEK_CUR)
offset += dev->pos();
else if (whence == SEEK_END)
offset += dev->size();
if (!dev->seek(offset))
return AVERROR(EINVAL);
return offset;
}
QPlatformMediaPlayer::TrackType MediaDataHolder::trackTypeFromMediaType(int mediaType)
{
switch (mediaType) {
case AVMEDIA_TYPE_AUDIO:
return QPlatformMediaPlayer::AudioStream;
case AVMEDIA_TYPE_VIDEO:
return QPlatformMediaPlayer::VideoStream;
case AVMEDIA_TYPE_SUBTITLE:
return QPlatformMediaPlayer::SubtitleStream;
default:
return QPlatformMediaPlayer::NTrackTypes;
}
}
std::optional<MediaDataHolder::ContextError>
MediaDataHolder::recreateAVFormatContext(const QUrl &media, QIODevice *stream)
{
*this = MediaDataHolder{};
QByteArray url = media.toEncoded(QUrl::PreferLocalFile);
AVFormatContext *context = nullptr;
if (stream) {
if (!stream->isOpen()) {
if (!stream->open(QIODevice::ReadOnly))
return ContextError{ QMediaPlayer::ResourceError,
QLatin1String("Could not open source device.") };
}
if (!stream->isSequential())
stream->seek(0);
context = avformat_alloc_context();
constexpr int bufferSize = 32768;
unsigned char *buffer = (unsigned char *)av_malloc(bufferSize);
context->pb = avio_alloc_context(buffer, bufferSize, false, stream, &readQIODevice, nullptr, &seekQIODevice);
}
int ret = avformat_open_input(&context, url.constData(), nullptr, nullptr);
if (ret < 0) {
auto code = QMediaPlayer::ResourceError;
if (ret == AVERROR(EACCES))
code = QMediaPlayer::AccessDeniedError;
else if (ret == AVERROR(EINVAL))
code = QMediaPlayer::FormatError;
return ContextError{ code, QMediaPlayer::tr("Could not open file") };
}
ret = avformat_find_stream_info(context, nullptr);
if (ret < 0) {
avformat_close_input(&context);
return ContextError{ QMediaPlayer::FormatError,
QMediaPlayer::tr("Could not find stream information for media file") };
}
#ifndef QT_NO_DEBUG
av_dump_format(context, 0, url.constData(), 0);
#endif
m_isSeekable = !(context->ctx_flags & AVFMTCTX_UNSEEKABLE);
m_context.reset(context);
updateStreams();
updateMetaData();
return {};
}
void MediaDataHolder::updateStreams()
{
m_duration = 0;
m_requestedStreams = { -1, -1, -1 };
m_currentAVStreamIndex = { -1, -1, -1 };
m_streamMap = {};
if (!m_context) {
return;
}
for (unsigned int i = 0; i < m_context->nb_streams; ++i) {
const auto *stream = m_context->streams[i];
const auto trackType = trackTypeFromMediaType(stream->codecpar->codec_type);
if (trackType == QPlatformMediaPlayer::NTrackTypes)
continue;
auto metaData = QFFmpegMetaData::fromAVMetaData(stream->metadata);
const bool isDefault = stream->disposition & AV_DISPOSITION_DEFAULT;
if (trackType != QPlatformMediaPlayer::SubtitleStream) {
insertMediaData(metaData, trackType, stream);
if (isDefault && m_requestedStreams[trackType] < 0)
m_requestedStreams[trackType] = m_streamMap[trackType].size();
}
m_streamMap[trackType].append({ (int)i, isDefault, metaData });
m_duration =
qMax(m_duration,
1000000 * stream->duration * stream->time_base.num / stream->time_base.den);
}
for (auto trackType :
{ QPlatformMediaPlayer::VideoStream, QPlatformMediaPlayer::AudioStream }) {
auto &requestedStream = m_requestedStreams[trackType];
auto &streamMap = m_streamMap[trackType];
if (requestedStream < 0 && !streamMap.empty())
requestedStream = 0;
if (requestedStream >= 0)
m_currentAVStreamIndex[trackType] = streamMap[requestedStream].avStreamIndex;
}
}
void MediaDataHolder::updateMetaData()
{
m_metaData = {};
if (!m_context)
return;
m_metaData = QFFmpegMetaData::fromAVMetaData(m_context->metadata);
m_metaData.insert(QMediaMetaData::FileFormat,
QVariant::fromValue(QFFmpegMediaFormatInfo::fileFormatForAVInputFormat(
m_context->iformat)));
for (auto trackType :
{ QPlatformMediaPlayer::AudioStream, QPlatformMediaPlayer::VideoStream }) {
const auto streamIndex = m_currentAVStreamIndex[QPlatformMediaPlayer::VideoStream];
if (streamIndex >= 0)
insertMediaData(m_metaData, trackType, m_context->streams[streamIndex]);
}
}
bool MediaDataHolder::setActiveTrack(QPlatformMediaPlayer::TrackType type, int streamNumber)
{
if (!m_context)
return false;
if (streamNumber < 0 || streamNumber >= m_streamMap[type].size())
streamNumber = -1;
if (m_requestedStreams[type] == streamNumber)
return false;
m_requestedStreams[type] = streamNumber;
const int avStreamIndex = m_streamMap[type].value(streamNumber).avStreamIndex;
const int oldIndex = m_currentAVStreamIndex[type];
qDebug() << ">>>>> change track" << type << "from" << oldIndex << "to" << avStreamIndex;
// TODO: maybe add additional verifications
m_currentAVStreamIndex[type] = avStreamIndex;
updateMetaData();
return true;
}
int MediaDataHolder::activeTrack(QPlatformMediaPlayer::TrackType type) const
{
return type < QPlatformMediaPlayer::NTrackTypes ? m_requestedStreams[type] : -1;
}
}
QT_END_NAMESPACE
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