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oak-editor/io/previewgenerator.cpp
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/***
Olive - Non-Linear Video Editor
Copyright (C) 2019 Olive Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
#include "previewgenerator.h"
#include "ui/mediaiconservice.h"
#include "project/media.h"
#include "project/footage.h"
#include "panels/viewer.h"
#include "panels/project.h"
#include "io/config.h"
#include "io/path.h"
#include "debug.h"
#include <QPainter>
#include <QPixmap>
#include <QtMath>
#include <QTreeWidgetItem>
#include <QSemaphore>
#include <QFile>
#include <QDir>
QSemaphore sem(5); // only 5 preview generators can run at one time
PreviewGenerator::PreviewGenerator(Media* i) :
QThread(nullptr)
{
fmt_ctx_ = (nullptr);
media_ = (i);
retrieve_duration_ = (false);
contains_still_image_ = (false);
cancelled_ = (false);
footage_ = media_->to_footage();
footage_->preview_gen = this;
data_dir_ = QDir(get_data_dir().filePath("previews"));
if (!data_dir_.exists()) {
data_dir_.mkpath(".");
}
connect(this, SIGNAL(finished()), this, SLOT(deleteLater()));
// set up throbber animation
olive::media_icon_service->SetMediaIcon(media_, ICON_TYPE_LOADING);
start(QThread::LowPriority);
}
void PreviewGenerator::parse_media() {
// detect video/audio streams in file
for (int i=0;i<int(fmt_ctx_->nb_streams);i++) {
// Find the decoder for the video stream
if (avcodec_find_decoder(fmt_ctx_->streams[i]->codecpar->codec_id) == nullptr) {
qCritical() << "Unsupported codec in stream" << i << "of file" << footage_->name;
} else {
FootageStream ms;
ms.preview_done = false;
ms.file_index = i;
ms.enabled = true;
ms.infinite_length = false;
bool append = false;
if (fmt_ctx_->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO
&& fmt_ctx_->streams[i]->codecpar->width > 0
&& fmt_ctx_->streams[i]->codecpar->height > 0) {
// heuristic to determine if video is a still image (if it is, we treat it differently in the playback/render process)
if (fmt_ctx_->streams[i]->avg_frame_rate.den == 0
&& fmt_ctx_->streams[i]->codecpar->codec_id != AV_CODEC_ID_DNXHD) { // silly hack but this is the only scenario i've seen this
if (footage_->url.contains('%')) {
// must be an image sequence
ms.video_frame_rate = 25;
} else {
ms.infinite_length = true;
contains_still_image_ = true;
ms.video_frame_rate = 0;
}
} else {
// using ffmpeg's built-in heuristic
ms.video_frame_rate = av_q2d(av_guess_frame_rate(fmt_ctx_, fmt_ctx_->streams[i], nullptr));
}
ms.video_width = fmt_ctx_->streams[i]->codecpar->width;
ms.video_height = fmt_ctx_->streams[i]->codecpar->height;
// default value, we get the true value later in generate_waveform()
ms.video_auto_interlacing = VIDEO_PROGRESSIVE;
ms.video_interlacing = VIDEO_PROGRESSIVE;
append = true;
} else if (fmt_ctx_->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
ms.audio_channels = fmt_ctx_->streams[i]->codecpar->channels;
ms.audio_layout = int(fmt_ctx_->streams[i]->codecpar->channel_layout);
ms.audio_frequency = fmt_ctx_->streams[i]->codecpar->sample_rate;
append = true;
}
if (append) {
QVector<FootageStream>& stream_list = (fmt_ctx_->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) ?
footage_->audio_tracks : footage_->video_tracks;
for (int j=0;j<stream_list.size();j++) {
if (stream_list.at(j).file_index == i) {
stream_list[j] = ms;
append = false;
}
}
if (append) stream_list.append(ms);
}
}
}
footage_->length = fmt_ctx_->duration;
if (fmt_ctx_->duration == INT64_MIN) {
retrieve_duration_ = true;
} else {
finalize_media();
}
}
bool PreviewGenerator::retrieve_preview(const QString& hash) {
// returns true if generate_waveform must be run, false if we got all previews from cached files
if (retrieve_duration_) {
//dout << "[NOTE] " << media->name << "needs to retrieve duration";
return true;
}
bool found = true;
for (int i=0;i<footage_->video_tracks.size();i++) {
FootageStream& ms = footage_->video_tracks[i];
QString thumb_path = get_thumbnail_path(hash, ms);
QFile f(thumb_path);
if (f.exists() && ms.video_preview.load(thumb_path)) {
//dout << "loaded thumb" << ms->file_index << "from" << thumb_path;
ms.make_square_thumb();
ms.preview_done = true;
} else {
found = false;
break;
}
}
for (int i=0;i<footage_->audio_tracks.size();i++) {
FootageStream& ms = footage_->audio_tracks[i];
QString waveform_path = get_waveform_path(hash, ms);
QFile f(waveform_path);
if (f.exists()) {
//dout << "loaded wave" << ms->file_index << "from" << waveform_path;
f.open(QFile::ReadOnly);
QByteArray data = f.readAll();
ms.audio_preview.resize(data.size());
for (int j=0;j<data.size();j++) {
// faster way?
ms.audio_preview[j] = data.at(j);
}
ms.preview_done = true;
f.close();
} else {
found = false;
break;
}
}
if (!found) {
for (int i=0;i<footage_->video_tracks.size();i++) {
FootageStream& ms = footage_->video_tracks[i];
ms.preview_done = false;
}
for (int i=0;i<footage_->audio_tracks.size();i++) {
FootageStream& ms = footage_->audio_tracks[i];
ms.audio_preview.clear();
ms.preview_done = false;
}
}
return !found;
}
void PreviewGenerator::finalize_media() {
footage_->ready_lock.unlock();
footage_->ready = true;
if (!cancelled_) {
if (footage_->video_tracks.size() == 0) {
olive::media_icon_service->SetMediaIcon(media_, ICON_TYPE_AUDIO);
} else if (contains_still_image_) {
olive::media_icon_service->SetMediaIcon(media_, ICON_TYPE_IMAGE);
} else {
olive::media_icon_service->SetMediaIcon(media_, ICON_TYPE_VIDEO);
}
if (olive::ActiveSequence != nullptr) {
olive::ActiveSequence->RefreshClips(media_);
}
}
}
void thumb_data_cleanup(void *info) {
delete [] static_cast<uint8_t*>(info);
}
void PreviewGenerator::generate_waveform() {
SwsContext* sws_ctx;
SwrContext* swr_ctx;
AVFrame* temp_frame = av_frame_alloc();
// stores codec contexts for format's streams
AVCodecContext** codec_ctx = new AVCodecContext* [fmt_ctx_->nb_streams];
// stores media lengths while scanning in case the format has no duration metadata
int64_t* media_lengths = new int64_t[fmt_ctx_->nb_streams]{0};
// stores samples while scanning before they get sent to preview file
qint16*** waveform_cache_data = new qint16** [fmt_ctx_->nb_streams];
int waveform_cache_count = 0;
// defaults to false, sets to true if we find a valid stream to make a preview of
bool create_previews = false;
for (unsigned int i=0;i<fmt_ctx_->nb_streams;i++) {
// default to nullptr values for easier memory management later
codec_ctx[i] = nullptr;
waveform_cache_data[i] = nullptr;
// we only generate previews for video and audio
// and only if the thumbnail and waveform sizes are > 0
if ((fmt_ctx_->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && olive::CurrentConfig.thumbnail_resolution > 0)
|| (fmt_ctx_->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && olive::CurrentConfig.waveform_resolution > 0)) {
AVCodec* codec = avcodec_find_decoder(fmt_ctx_->streams[i]->codecpar->codec_id);
if (codec != nullptr) {
// alloc the context and load the params into it
codec_ctx[i] = avcodec_alloc_context3(codec);
avcodec_parameters_to_context(codec_ctx[i], fmt_ctx_->streams[i]->codecpar);
// open the decoder
avcodec_open2(codec_ctx[i], codec, nullptr);
// audio specific functions
if (fmt_ctx_->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
// allocate sample cache for this stream
waveform_cache_data[i] = new qint16* [fmt_ctx_->streams[i]->codecpar->channels];
// each channel gets a min and a max value so we allocate two ints for each one
for (int j=0;j<fmt_ctx_->streams[i]->codecpar->channels;j++) {
waveform_cache_data[i][j] = new qint16[2];
}
// if codec context has no defined channel layout, guess it from the channel count
if (codec_ctx[i]->channel_layout == 0) {
codec_ctx[i]->channel_layout = av_get_default_channel_layout(fmt_ctx_->streams[i]->codecpar->channels);
}
}
// enable next step of process
create_previews = true;
}
}
}
if (create_previews) {
// TODO may be unnecessary - doesn't av_read_frame allocate a packet itself?
AVPacket* packet = av_packet_alloc();
bool done = true;
bool end_of_file = false;
// get the ball rolling
do {
av_read_frame(fmt_ctx_, packet);
} while (codec_ctx[packet->stream_index] == nullptr);
avcodec_send_packet(codec_ctx[packet->stream_index], packet);
while (!end_of_file) {
while (codec_ctx[packet->stream_index] == nullptr || avcodec_receive_frame(codec_ctx[packet->stream_index], temp_frame) == AVERROR(EAGAIN)) {
av_packet_unref(packet);
int read_ret = av_read_frame(fmt_ctx_, packet);
if (read_ret < 0) {
end_of_file = true;
if (read_ret != AVERROR_EOF) qCritical() << "Failed to read packet for preview generation" << read_ret;
break;
}
if (codec_ctx[packet->stream_index] != nullptr) {
int send_ret = avcodec_send_packet(codec_ctx[packet->stream_index], packet);
if (send_ret < 0 && send_ret != AVERROR(EAGAIN)) {
qCritical() << "Failed to send packet for preview generation - aborting" << send_ret;
end_of_file = true;
break;
}
}
}
if (!end_of_file) {
FootageStream* s = footage_->get_stream_from_file_index(fmt_ctx_->streams[packet->stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO, packet->stream_index);
if (s != nullptr) {
if (fmt_ctx_->streams[packet->stream_index]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
if (!s->preview_done) {
int dstH = olive::CurrentConfig.thumbnail_resolution;
int dstW = qRound(dstH * (float(temp_frame->width)/float(temp_frame->height)));
uint8_t* data = new uint8_t[size_t(dstW*dstH*4)];
sws_ctx = sws_getContext(
temp_frame->width,
temp_frame->height,
static_cast<AVPixelFormat>(temp_frame->format),
dstW,
dstH,
static_cast<AVPixelFormat>(AV_PIX_FMT_RGBA),
SWS_FAST_BILINEAR,
nullptr,
nullptr,
nullptr
);
int linesize[AV_NUM_DATA_POINTERS];
linesize[0] = dstW*4;
sws_scale(sws_ctx, temp_frame->data, temp_frame->linesize, 0, temp_frame->height, &data, linesize);
s->video_preview = QImage(data, dstW, dstH, linesize[0], QImage::Format_RGBA8888, thumb_data_cleanup);
s->make_square_thumb();
// is video interlaced?
s->video_auto_interlacing = (temp_frame->interlaced_frame) ? ((temp_frame->top_field_first) ? VIDEO_TOP_FIELD_FIRST : VIDEO_BOTTOM_FIELD_FIRST) : VIDEO_PROGRESSIVE;
s->video_interlacing = s->video_auto_interlacing;
s->preview_done = true;
sws_freeContext(sws_ctx);
if (!retrieve_duration_) {
avcodec_close(codec_ctx[packet->stream_index]);
codec_ctx[packet->stream_index] = nullptr;
}
}
media_lengths[packet->stream_index]++;
} else if (fmt_ctx_->streams[packet->stream_index]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
AVFrame* swr_frame = av_frame_alloc();
swr_frame->channel_layout = temp_frame->channel_layout;
swr_frame->sample_rate = temp_frame->sample_rate;
swr_frame->format = AV_SAMPLE_FMT_S16P;
swr_ctx = swr_alloc_set_opts(
nullptr,
temp_frame->channel_layout,
static_cast<AVSampleFormat>(swr_frame->format),
temp_frame->sample_rate,
temp_frame->channel_layout,
static_cast<AVSampleFormat>(temp_frame->format),
temp_frame->sample_rate,
0,
nullptr
);
swr_init(swr_ctx);
swr_convert_frame(swr_ctx, swr_frame, temp_frame);
// `config.waveform_resolution` determines how many samples per second are stored in waveform.
// `sample_rate` is samples per second, so `interval` is how many samples are averaged in
// each "point" of the waveform
int interval = qFloor((temp_frame->sample_rate/olive::CurrentConfig.waveform_resolution)/4)*4;
// get the amount of bytes in an audio sample
int sample_size = av_get_bytes_per_sample(static_cast<AVSampleFormat>(swr_frame->format));
// total amount of data in this frame
int nb_bytes = swr_frame->nb_samples * sample_size;
// loop through entire frame
for (int i=0;i<nb_bytes;i+=sample_size) {
// check if we've hit sample threshold
if (waveform_cache_count == interval) {
// if so, we dump our cached values into the preview and reset them
// for the next interval
for (int j=0;j<swr_frame->channels;j++) {
qint16& min = waveform_cache_data[packet->stream_index][j][0];
qint16& max = waveform_cache_data[packet->stream_index][j][1];
s->audio_preview.append(min >> 8);
s->audio_preview.append(max >> 8);
}
waveform_cache_count = 0;
}
// standard processing for each channel of information
for (int j=0;j<swr_frame->channels;j++) {
qint16& min = waveform_cache_data[packet->stream_index][j][0];
qint16& max = waveform_cache_data[packet->stream_index][j][1];
// if we're starting over, reset cache to zero
if (waveform_cache_count == 0) {
min = 0;
max = 0;
}
// store most minimum and most maximum samples of this interval
qint16 sample = qint16((swr_frame->data[j][i+1] << 8) | swr_frame->data[j][i]);
min = qMin(min, sample);
max = qMax(max, sample);
}
waveform_cache_count++;
if (cancelled_) {
break;
}
}
swr_free(&swr_ctx);
av_frame_free(&swr_frame);
if (cancelled_) {
end_of_file = true;
break;
}
}
}
// check if we've got all our previews
if (retrieve_duration_) {
done = false;
} else if (footage_->audio_tracks.size() == 0) {
done = true;
for (int i=0;i<footage_->video_tracks.size();i++) {
if (!footage_->video_tracks.at(i).preview_done) {
done = false;
break;
}
}
if (done) {
end_of_file = true;
break;
}
}
av_packet_unref(packet);
}
}
av_frame_free(&temp_frame);
av_packet_free(&packet);
for (unsigned int i=0;i<fmt_ctx_->nb_streams;i++) {
if (waveform_cache_data[i] != nullptr) {
for (int j=0;j<codec_ctx[i]->channels;j++) {
delete [] waveform_cache_data[i][j];
}
delete [] waveform_cache_data[i];
}
if (codec_ctx[i] != nullptr) {
avcodec_close(codec_ctx[i]);
avcodec_free_context(&codec_ctx[i]);
}
}
// by this point, we'll have made all audio waveform previews
for (int i=0;i<footage_->audio_tracks.size();i++) {
footage_->audio_tracks[i].preview_done = true;
}
}
if (retrieve_duration_) {
footage_->length = 0;
unsigned int maximum_stream = 0;
for (unsigned int i=0;i<fmt_ctx_->nb_streams;i++) {
if (media_lengths[i] > media_lengths[maximum_stream]) {
maximum_stream = i;
}
}
// FIXME: length is currently retrieved as a frame count rather than a timestamp
footage_->length = qRound(double(media_lengths[maximum_stream]) / av_q2d(fmt_ctx_->streams[maximum_stream]->avg_frame_rate) * AV_TIME_BASE);
finalize_media();
}
delete [] waveform_cache_data;
delete [] media_lengths;
delete [] codec_ctx;
}
QString PreviewGenerator::get_thumbnail_path(const QString& hash, const FootageStream& ms) {
return data_dir_.filePath(QString("%1t%2").arg(hash, QString::number(ms.file_index)));
}
QString PreviewGenerator::get_waveform_path(const QString& hash, const FootageStream& ms) {
return data_dir_.filePath(QString("%1w%2").arg(hash, QString::number(ms.file_index)));
}
void PreviewGenerator::run() {
Q_ASSERT(footage_ != nullptr);
Q_ASSERT(media_ != nullptr);
const QString url = footage_->url;
QByteArray ba = url.toUtf8();
char* filename = new char[ba.size()+1];
strcpy(filename, ba.data());
QString errorStr;
bool error = false;
AVDictionary* format_opts = nullptr;
// for image sequences that don't start at 0, set the index where it does start
if (footage_->start_number > 0) {
av_dict_set(&format_opts, "start_number", QString::number(footage_->start_number).toUtf8(), 0);
}
int errCode = avformat_open_input(&fmt_ctx_, filename, nullptr, &format_opts);
if(errCode != 0) {
char err[1024];
av_strerror(errCode, err, 1024);
errorStr = tr("Could not open file - %1").arg(err);
error = true;
} else {
errCode = avformat_find_stream_info(fmt_ctx_, nullptr);
if (errCode < 0) {
char err[1024];
av_strerror(errCode, err, 1024);
errorStr = tr("Could not find stream information - %1").arg(err);
error = true;
} else {
av_dump_format(fmt_ctx_, 0, filename, 0);
parse_media();
// see if we already have data for this
QString hash = get_file_hash(footage_->url);
if (retrieve_preview(hash)) {
sem.acquire();
if (!cancelled_) {
generate_waveform();
if (!cancelled_) {
// save preview to file
for (int i=0;i<footage_->video_tracks.size();i++) {
FootageStream& ms = footage_->video_tracks[i];
ms.video_preview.save(get_thumbnail_path(hash, ms), "PNG");
//dout << "saved" << ms->file_index << "thumbnail to" << get_thumbnail_path(hash, ms);
}
for (int i=0;i<footage_->audio_tracks.size();i++) {
FootageStream& ms = footage_->audio_tracks[i];
QFile f(get_waveform_path(hash, ms));
f.open(QFile::WriteOnly);
f.write(ms.audio_preview.constData(), ms.audio_preview.size());
f.close();
//dout << "saved" << ms->file_index << "waveform to" << get_waveform_path(hash, ms);
}
}
}
sem.release();
}
}
avformat_close_input(&fmt_ctx_);
}
if (!cancelled_) {
if (error) {
media_->update_tooltip(errorStr);
olive::media_icon_service->SetMediaIcon(media_, ICON_TYPE_ERROR);
footage_->invalid = true;
footage_->ready_lock.unlock();
} else {
media_->update_tooltip();
}
}
delete [] filename;
footage_->preview_gen = nullptr;
}
void PreviewGenerator::cancel() {
cancelled_ = true;
wait();
}
void PreviewGenerator::AnalyzeMedia(Media *m)
{
// PreviewGenerator's constructor starts the thread, sets a reference of itself as the media's generator,
// and connects its thread completion to its own deletion, therefore handling its own memory. Nothing else needs to
// be done.
new PreviewGenerator(m);
}
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