268 lines
6.9 KiB
C++
Executable File
268 lines
6.9 KiB
C++
Executable File
/* This file is a part of plaYUVer project
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* Copyright (C) 2014 by plaYUVer developers
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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; either version 2 of the License, or
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* (at your option) any later version.
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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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/**
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* \file LibAvContextHandle.cpp
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* \brief Interface with libav libs
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*/
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#include <cstdio>
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#include "LibAvContextHandle.h"
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namespace plaYUVer
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{
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static int open_codec_context( int *stream_idx, AVFormatContext *fmt_ctx, enum AVMediaType type )
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{
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int ret;
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AVStream *st;
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AVCodecContext *dec_ctx = NULL;
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AVCodec *dec = NULL;
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ret = av_find_best_stream( fmt_ctx, type, -1, -1, NULL, 0 );
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if( ret < 0 )
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{
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return ret;
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}
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else
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{
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*stream_idx = ret;
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st = fmt_ctx->streams[*stream_idx];
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/* find decoder for the stream */
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dec_ctx = st->codec;
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dec = avcodec_find_decoder( dec_ctx->codec_id );
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if( !dec )
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{
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printf( "Failed to find %s codec\n", av_get_media_type_string( type ) );
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return ret;
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}
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if( ( ret = avcodec_open2( dec_ctx, dec, NULL ) ) < 0 )
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{
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printf( "Failed to open %s codec\n", av_get_media_type_string( type ) );
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return ret;
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}
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}
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return 0;
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}
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Void LibAvContextHandle::closeAvFormat()
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{
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if( m_bHasStream )
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{
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if( video_dec_ctx )
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avcodec_close( video_dec_ctx );
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if( fmt_ctx )
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avformat_close_input( &fmt_ctx );
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av_free( frame );
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av_free( video_dst_data[0] );
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}
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m_bHasStream = false;
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}
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Bool LibAvContextHandle::initAvFormat( char* filename, UInt& width, UInt& height, Int& pixel_format, UInt& frame_rate )
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{
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int ret = 0;
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fmt_ctx = NULL;
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video_dec_ctx = NULL;
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video_stream = NULL;
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video_dst_data[0] = NULL;
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video_dst_data[1] = NULL;
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video_dst_data[2] = NULL;
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video_dst_data[3] = NULL;
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video_stream_idx = -1;
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frame = NULL;
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m_bHasStream = false;
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char *src_filename = filename;
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AVDictionary *format_opts = NULL;
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/* register all formats and codecs */
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av_register_all();
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if( width >= 0 && height >= 0 )
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{
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Char aux_string[10];
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sprintf( aux_string, "%dx%d", width, height );
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av_dict_set( &format_opts, "video_size", aux_string, 0 );
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}
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switch( pixel_format )
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{
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case NO_FMT:
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break;
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case YUV420p:
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av_dict_set( &format_opts, "pixel_format", av_get_pix_fmt_name( AV_PIX_FMT_YUV420P ), 0 );
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break;
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case GRAY:
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av_dict_set( &format_opts, "pixel_format", av_get_pix_fmt_name( AV_PIX_FMT_GRAY8 ), 0 );
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break;
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default:
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break;
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}
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/* open input file, and allocate format context */
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if( avformat_open_input( &fmt_ctx, src_filename, NULL, &format_opts ) < 0 )
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{
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//qDebug( ) << " Could not open source file %s !!!" << filename << endl;
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return false;
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}
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/* retrieve stream information */
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if( avformat_find_stream_info( fmt_ctx, NULL ) < 0 )
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{
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//qDebug( ) << " Could not find stream information !!!" << endl;
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return false;
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}
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if( open_codec_context( &video_stream_idx, fmt_ctx, AVMEDIA_TYPE_VIDEO ) >= 0 )
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{
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video_stream = fmt_ctx->streams[video_stream_idx];
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video_dec_ctx = video_stream->codec;
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/* allocate image where the decoded image will be put */
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ret = av_image_alloc( video_dst_data, video_dst_linesize, video_dec_ctx->width, video_dec_ctx->height, video_dec_ctx->pix_fmt, 1 );
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if( ret < 0 )
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{
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//qDebug( ) << " Could not allocate raw video buffer !!!" << endl;
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closeAvFormat();
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return false;
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}
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video_dst_bufsize = ret;
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}
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const char *codec_name = avcodec_get_name(video_dec_ctx->codec_id);
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sprintf(m_acStreamInformationString, "%s ", codec_name);
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Double fr = 30;
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if( video_stream->avg_frame_rate.den && video_stream->avg_frame_rate.num )
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fr = av_q2d( video_stream->avg_frame_rate );
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#if FF_API_R_FRAME_RATE
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else if( video_stream->r_frame_rate.den && video_stream->r_frame_rate.num )
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fr = av_q2d( video_stream->r_frame_rate );
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#endif
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else if( video_stream->time_base.den && video_stream->time_base.num )
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fr = 1 / av_q2d( video_stream->time_base );
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else if( video_stream->codec->time_base.den && video_stream->codec->time_base.num )
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fr = 1 / av_q2d( video_stream->codec->time_base );
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frame_rate = ( UInt )fr;
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width = video_dec_ctx->width;
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height = video_dec_ctx->height;
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switch( video_dec_ctx->pix_fmt )
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{
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case AV_PIX_FMT_YUV420P:
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pixel_format = YUV420p;
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break;
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case AV_PIX_FMT_GRAY8:
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pixel_format = GRAY;
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break;
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default:
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break;
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}
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/* dump input information to stderr */
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av_dump_format( fmt_ctx, 0, src_filename, 0 );
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if( !video_stream )
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{
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//qDebug( ) << " Could not find audio or video stream in the input, aborting !!!" << endl;
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closeAvFormat();
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return false;
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}
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#if( LIBAVFORMAT_VERSION_MAJOR >= 55 )
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frame = av_frame_alloc();
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#else
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frame = avcodec_alloc_frame();
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#endif
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if( !frame )
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{
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//qDebug( ) << " Could not allocate frame !!!" << endl;
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ret = AVERROR( ENOMEM );
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closeAvFormat();
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return false;
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}
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/* initialize packet, set data to NULL, let the demuxer fill it */
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av_init_packet( &pkt );
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pkt.data = NULL;
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pkt.size = 0;
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m_bHasStream = true;
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return true;
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}
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Bool LibAvContextHandle::decodeAvFormat()
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{
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Int got_frame;
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int ret;
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/* read frames from the file */
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if( av_read_frame( fmt_ctx, &pkt ) >= 0 )
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{
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if( pkt.stream_index == video_stream_idx )
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{
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/* decode video frame */
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ret = avcodec_decode_video2( video_dec_ctx, frame, &got_frame, &pkt );
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if( ret < 0 )
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{
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fprintf( stderr, "Error decoding video frame\n" );
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return false;
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}
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if( got_frame )
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{
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/* copy decoded frame to destination buffer:
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* this is required since rawvideo expects non aligned data */
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av_image_copy( video_dst_data, video_dst_linesize, ( const uint8_t ** )( frame->data ), frame->linesize, video_dec_ctx->pix_fmt, video_dec_ctx->width,
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video_dec_ctx->height );
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/* write to rawvideo file */
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//fwrite( video_dst_data[0], 1, video_dst_bufsize, video_dst_file );
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}
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}
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av_free_packet( &pkt );
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}
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// /* flush cached frames */
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// pkt.data = NULL;
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// pkt.size = 0;
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// do
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// {
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// decode_packet( &got_frame, 1 );
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// }
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// while( got_frame );
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return true;
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}
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Void LibAvContextHandle::seekAvFormat( UInt frame_num )
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{
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av_seek_frame( fmt_ctx, video_stream_idx, frame_num, AVSEEK_FLAG_ANY );
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}
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} // NAMESPACE
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