QTfrontend/util/libav_iteraction.cpp
author nemo
Wed, 29 Aug 2012 09:58:23 -0400
changeset 7623 addc5b262617
parent 7620 fa3bc79dc0b8
child 7679 bfa26daad684
permissions -rw-r--r--
isZero appears to be never used. Use it in a few obvious cases and add web variant.
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2004-2012 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#include "libav_iteraction.h"
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#if VIDEOREC
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#define __STDC_CONSTANT_MACROS
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extern "C"
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{
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#include "libavformat/avformat.h"
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}
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#include <QVector>
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#include <QList>
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#include <QMessageBox>
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#include <QComboBox>
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#include "HWApplication.h"
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struct Codec
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{
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    CodecID id;
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    bool isAudio;
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    QString shortName; // used for identification
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    QString longName; // used for displaying to user
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    bool isRecomended;
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};
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struct Format
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{
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    QString shortName;
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    QString longName;
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    bool isRecomended;
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    QString extension;
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    QVector<Codec*> codecs;
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};
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QList<Codec> codecs;
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QMap<QString,Format> formats;
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// test if given format supports given codec
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bool FormatQueryCodec(AVOutputFormat *ofmt, enum CodecID codec_id)
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{
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#if LIBAVFORMAT_VERSION_MAJOR >= 54
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    return avformat_query_codec(ofmt, codec_id, FF_COMPLIANCE_NORMAL) == 1;
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#else
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    if (ofmt->codec_tag)
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        return !!av_codec_get_tag(ofmt->codec_tag, codec_id);
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    return codec_id == ofmt->video_codec || codec_id == ofmt->audio_codec;
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#endif
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}
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LibavIteraction::LibavIteraction()
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{
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    // initialize libav and register all codecs and formats
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    av_register_all();
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    // get list of all codecs
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    AVCodec* pCodec = NULL;
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    while (pCodec = av_codec_next(pCodec))
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    {
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#if LIBAVCODEC_VERSION_MAJOR >= 54
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        if (!av_codec_is_encoder(pCodec))
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#else
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        if (!pCodec->encode)
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#endif
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            continue;
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        if (pCodec->type != AVMEDIA_TYPE_VIDEO && pCodec->type != AVMEDIA_TYPE_AUDIO)
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            continue;
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        // this encoders seems to be buggy
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        if (strcmp(pCodec->name, "rv10") == 0 || strcmp(pCodec->name, "rv20") == 0)
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            continue;
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        // doesn't support stereo sound
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        if (strcmp(pCodec->name, "real_144") == 0)
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            continue;
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        if (!pCodec->long_name || strlen(pCodec->long_name) == 0)
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            continue;
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        if (pCodec->type == AVMEDIA_TYPE_VIDEO)
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        {
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            if (pCodec->supported_framerates != NULL)
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                continue;
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            // check if codec supports yuv 4:2:0 format
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            if (!pCodec->pix_fmts)
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                continue;
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            bool yuv420Supported = false;
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            for (const PixelFormat* pfmt = pCodec->pix_fmts; *pfmt != -1; pfmt++)
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                if (*pfmt == PIX_FMT_YUV420P)
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                {
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                    yuv420Supported = true;
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                    break;
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                }
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            if (!yuv420Supported)
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                continue;
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        }
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        if (pCodec->type == AVMEDIA_TYPE_AUDIO)
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        {
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            // check if codec supports signed 16-bit format
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            if (!pCodec->sample_fmts)
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                continue;
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            bool s16Supported = false;
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            for (const AVSampleFormat* pfmt = pCodec->sample_fmts; *pfmt != -1; pfmt++)
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                if (*pfmt == AV_SAMPLE_FMT_S16)
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                {
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                    s16Supported = true;
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                    break;
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                }
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            if (!s16Supported)
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                continue;
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        }
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        // add codec to list of codecs
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        codecs.push_back(Codec());
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        Codec & codec = codecs.back();
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        codec.id = pCodec->id;
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        codec.isAudio = pCodec->type == AVMEDIA_TYPE_AUDIO;
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        codec.shortName = pCodec->name;
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        codec.longName = pCodec->long_name;
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        codec.isRecomended = false;
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        if (strcmp(pCodec->name, "libx264") == 0)
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        {
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            codec.longName = "H.264/MPEG-4 Part 10 AVC (x264)";
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            codec.isRecomended = true;
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        }
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        else if (strcmp(pCodec->name, "libxvid") == 0)
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        {
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            codec.longName = "MPEG-4 Part 2 (Xvid)";
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            codec.isRecomended = true;
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        }
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        else if (strcmp(pCodec->name, "libmp3lame") == 0)
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        {
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            codec.longName = "MP3 (MPEG audio layer 3) (LAME)";
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            codec.isRecomended = true;
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        }
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        else
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            codec.longName = pCodec->long_name;
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        if (strcmp(pCodec->name, "mpeg4") == 0 || strcmp(pCodec->name, "ac3_fixed") == 0)
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            codec.isRecomended = true;
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        // FIXME: remove next line
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        //codec.longName += QString(" (%1)").arg(codec.shortName);
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    }
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    // get list of all formats
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    AVOutputFormat* pFormat = NULL;
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    while (pFormat = av_oformat_next(pFormat))
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    {
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        if (!pFormat->extensions)
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            continue;
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        // skip some strange formats to not confuse users
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        if (strstr(pFormat->long_name, "raw"))
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            continue;
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        Format format;
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        bool hasVideoCodec = false;
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        for (QList<Codec>::iterator codec = codecs.begin(); codec != codecs.end(); ++codec)
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        {
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            if (!FormatQueryCodec(pFormat, codec->id))
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                continue;
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            format.codecs.push_back(&*codec);
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            if (!codec->isAudio)
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                hasVideoCodec = true;
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        }
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        if (!hasVideoCodec)
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            continue;
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        QString ext(pFormat->extensions);
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        ext.truncate(strcspn(pFormat->extensions, ","));
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        format.extension = ext;
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        format.shortName = pFormat->name;
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        format.longName = QString("%1 (*.%2)").arg(pFormat->long_name).arg(ext);
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        // FIXME: remove next line
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        //format.longName += QString(" (%1)").arg(format.shortName);
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        format.isRecomended = strcmp(pFormat->name, "mp4") == 0 || strcmp(pFormat->name, "avi") == 0;
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        formats[pFormat->name] = format;
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    }
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}
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void LibavIteraction::fillFormats(QComboBox * pFormats)
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{
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    // first insert recomended formats
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    foreach(const Format & format, formats)
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        if (format.isRecomended)
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            pFormats->addItem(format.longName, format.shortName);
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    // remember where to place separator between recomended and other formats
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    int sep = pFormats->count();
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    // insert remaining formats
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    foreach(const Format & format, formats)
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        if (!format.isRecomended)
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            pFormats->addItem(format.longName, format.shortName);
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    // insert separator if necessary
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    if (sep != 0 && sep != pFormats->count())
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        pFormats->insertSeparator(sep);
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}
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void LibavIteraction::fillCodecs(const QString & fmt, QComboBox * pVCodecs, QComboBox * pACodecs)
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{
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    Format & format = formats[fmt];
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    // first insert recomended codecs
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    foreach(Codec * codec, format.codecs)
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    {
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        if (codec->isRecomended)
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        {
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            if (codec->isAudio)
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                pACodecs->addItem(codec->longName, codec->shortName);
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            else
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                pVCodecs->addItem(codec->longName, codec->shortName);
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        }
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    }
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    // remember where to place separators between recomended and other codecs
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    int vsep = pVCodecs->count();
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    int asep = pACodecs->count();
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    // insert remaining codecs
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    foreach(Codec * codec, format.codecs)
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    {
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        if (!codec->isRecomended)
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        {
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            if (codec->isAudio)
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                pACodecs->addItem(codec->longName, codec->shortName);
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            else
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                pVCodecs->addItem(codec->longName, codec->shortName);
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        }
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    }
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    // insert separators if necessary
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    if (vsep != 0 && vsep != pVCodecs->count())
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        pVCodecs->insertSeparator(vsep);
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    if (asep != 0 && asep != pACodecs->count())
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        pACodecs->insertSeparator(asep);
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}
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QString LibavIteraction::getExtension(const QString & format)
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{
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    return formats[format].extension;
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}
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QString tr(QString a)
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{
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    return a;
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}
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// get information abaout file (duration, resolution etc) in multiline string
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QString LibavIteraction::getFileInfo(const QString & filepath)
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{
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    AVFormatContext* pContext = NULL;
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    QByteArray utf8path = filepath.toUtf8();
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    if (avformat_open_input(&pContext, utf8path.data(), NULL, NULL) < 0)
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        return "";
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#if LIBAFORMAT_VERSION_MAJOR < 54
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    if (av_find_stream_info(pContext) < 0)
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#else
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    if (avformat_find_stream_info(pContext, NULL) < 0)
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#endif
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        return "";
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    int s = float(pContext->duration)/AV_TIME_BASE;
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    QString desc = QString(tr("Duration: %1m %2s\n")).arg(s/60).arg(s%60);
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    for (int i = 0; i < (int)pContext->nb_streams; i++)
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    {
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        AVStream* pStream = pContext->streams[i];
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        if (!pStream)
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            continue;
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        AVCodecContext* pCodec = pContext->streams[i]->codec;
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        if (!pCodec)
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            continue;
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        if (pCodec->codec_type == AVMEDIA_TYPE_VIDEO)
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        {
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            desc += QString(tr("Video: %1x%2, ")).arg(pCodec->width).arg(pCodec->height);
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            if (pStream->avg_frame_rate.den)
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            {
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                float fps = float(pStream->avg_frame_rate.num)/pStream->avg_frame_rate.den;
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                desc += QString(tr("%1 fps, ")).arg(fps, 0, 'f', 2);
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            }
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        }
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        else if (pCodec->codec_type == AVMEDIA_TYPE_AUDIO)
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            desc += tr("Audio: ");
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        else
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            continue;
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        AVCodec* pDecoder = avcodec_find_decoder(pCodec->codec_id);
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        desc += pDecoder? pDecoder->name : "unknown";
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        desc += "\n";
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    }
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    AVDictionaryEntry* pComment = av_dict_get(pContext->metadata, "comment", NULL, 0);
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    if (pComment)
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        desc += QString("\n") + pComment->value;
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#if LIBAFORMAT_VERSION_MAJOR < 54
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    av_close_input_file(pContext);
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#else
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    avformat_close_input(&pContext);
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#endif
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    return desc;
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}
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#else
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LibavIteraction::LibavIteraction()
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{
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}
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void LibavIteraction::fillFormats(QComboBox * pFormats)
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{
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    Q_UNUSED(pFormats);
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}
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void LibavIteraction::fillCodecs(const QString & format, QComboBox * pVCodecs, QComboBox * pACodecs)
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{
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    Q_UNUSED(format);
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    Q_UNUSED(pVCodecs);
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    Q_UNUSED(pACodecs);
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}
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QString LibavIteraction::getExtension(const QString & format)
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{
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    Q_UNUSED(format);
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    return QString();
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}
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QString LibavIteraction::getFileInfo(const QString & filepath)
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{
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    Q_UNUSED(filepath);
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    return QString();
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}
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#endif
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LibavIteraction & LibavIteraction::instance()
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{
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    static LibavIteraction instance;
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    return instance;
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}