281 lines
9.2 KiB
C
281 lines
9.2 KiB
C
/*****************************************************************************
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* lavf.c: libavformat input
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*****************************************************************************
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* Copyright (C) 2009-2025 x264 project
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*
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* Authors: Mike Gurlitz <mike.gurlitz@gmail.com>
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* Steven Walters <kemuri9@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; 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
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*
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* This program is also available under a commercial proprietary license.
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* For more information, contact us at licensing@x264.com.
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*****************************************************************************/
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#include "input.h"
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#undef DECLARE_ALIGNED
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#include <libavformat/avformat.h>
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#include <libavcodec/avcodec.h>
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#include <libavutil/dict.h>
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#include <libavutil/error.h>
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#include <libavutil/mem.h>
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#include <libavutil/pixdesc.h>
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#include <libavutil/version.h>
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#define FAIL_IF_ERROR( cond, ... ) FAIL_IF_ERR( cond, "lavf", __VA_ARGS__ )
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typedef struct
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{
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AVFormatContext *lavf;
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AVCodecContext *lavc;
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AVFrame *frame;
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AVPacket *pkt;
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int stream_id;
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int next_frame;
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int vfr_input;
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cli_pic_t *first_pic;
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} lavf_hnd_t;
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/* handle the deprecated jpeg pixel formats */
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static int handle_jpeg( int csp, int *fullrange )
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{
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switch( csp )
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{
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case AV_PIX_FMT_YUVJ420P: *fullrange = 1; return AV_PIX_FMT_YUV420P;
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case AV_PIX_FMT_YUVJ422P: *fullrange = 1; return AV_PIX_FMT_YUV422P;
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case AV_PIX_FMT_YUVJ444P: *fullrange = 1; return AV_PIX_FMT_YUV444P;
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default: return csp;
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}
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}
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static AVCodecContext *codec_from_stream( AVStream *stream )
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{
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AVCodec *codec = avcodec_find_decoder( stream->codecpar->codec_id );
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if( !codec )
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return NULL;
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AVCodecContext *c = avcodec_alloc_context3( codec );
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if( !c )
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return NULL;
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if( avcodec_parameters_to_context( c, stream->codecpar ) < 0 )
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{
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avcodec_free_context( &c );
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return NULL;
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}
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return c;
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}
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static int read_frame_internal( cli_pic_t *p_pic, lavf_hnd_t *h, int i_frame, video_info_t *info )
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{
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if( h->first_pic && !info )
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{
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/* see if the frame we are requesting is the frame we have already read and stored.
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* if so, retrieve the pts and image data before freeing it. */
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if( !i_frame )
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{
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XCHG( cli_image_t, p_pic->img, h->first_pic->img );
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p_pic->pts = h->first_pic->pts;
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}
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lavf_input.picture_clean( h->first_pic, h );
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free( h->first_pic );
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h->first_pic = NULL;
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if( !i_frame )
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return 0;
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}
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AVPacket *pkt = h->pkt;
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while( i_frame >= h->next_frame )
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{
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int ret;
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while( (ret = avcodec_receive_frame( h->lavc, h->frame )) )
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{
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if( ret == AVERROR(EAGAIN) )
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{
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while( !(ret = av_read_frame( h->lavf, pkt )) && pkt->stream_index != h->stream_id )
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av_packet_unref( pkt );
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if( ret )
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ret = avcodec_send_packet( h->lavc, NULL );
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else
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{
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ret = avcodec_send_packet( h->lavc, pkt );
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av_packet_unref( pkt );
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}
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}
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else if( ret == AVERROR_EOF )
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return -1;
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if( ret )
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{
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x264_cli_log( "lavf", X264_LOG_WARNING, "video decoding failed on frame %d\n", h->next_frame );
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return -1;
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}
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}
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h->next_frame++;
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}
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memcpy( p_pic->img.stride, h->frame->linesize, sizeof(p_pic->img.stride) );
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memcpy( p_pic->img.plane, h->frame->data, sizeof(p_pic->img.plane) );
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int is_fullrange = 0;
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p_pic->img.width = h->lavc->width;
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p_pic->img.height = h->lavc->height;
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p_pic->img.csp = handle_jpeg( h->lavc->pix_fmt, &is_fullrange ) | X264_CSP_OTHER;
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if( info )
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{
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info->fullrange = is_fullrange;
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#if LIBAVUTIL_VERSION_MAJOR < 60
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info->interlaced = h->frame->interlaced_frame;
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info->tff = h->frame->top_field_first;
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#else
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info->interlaced = !!(h->frame->flags & AV_FRAME_FLAG_INTERLACED);
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info->tff = !!(h->frame->flags & AV_FRAME_FLAG_TOP_FIELD_FIRST);
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#endif
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}
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if( h->vfr_input )
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{
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p_pic->pts = p_pic->duration = 0;
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if( h->frame->pts != AV_NOPTS_VALUE )
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p_pic->pts = h->frame->pts;
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else if( h->frame->pkt_dts != AV_NOPTS_VALUE )
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p_pic->pts = h->frame->pkt_dts; // for AVI files
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else if( info )
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{
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h->vfr_input = info->vfr = 0;
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return 0;
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}
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}
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return 0;
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}
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static int open_file( char *psz_filename, hnd_t *p_handle, video_info_t *info, cli_input_opt_t *opt )
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{
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lavf_hnd_t *h = calloc( 1, sizeof(lavf_hnd_t) );
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if( !h )
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return -1;
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if( !strcmp( psz_filename, "-" ) )
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psz_filename = "pipe:";
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h->frame = av_frame_alloc();
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if( !h->frame )
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return -1;
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h->pkt = av_packet_alloc();
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if( !h->pkt )
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return -1;
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/* if resolution was passed in, place it and colorspace into options. this allows raw video support */
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AVDictionary *options = NULL;
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if( opt->resolution )
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{
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av_dict_set( &options, "video_size", opt->resolution, 0 );
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const char *csp = opt->colorspace ? opt->colorspace : av_get_pix_fmt_name( AV_PIX_FMT_YUV420P );
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av_dict_set( &options, "pixel_format", csp, 0 );
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}
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/* specify the input format. this is helpful when lavf fails to guess */
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AVInputFormat *format = NULL;
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if( opt->format )
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FAIL_IF_ERROR( !(format = av_find_input_format( opt->format )), "unknown file format: %s\n", opt->format );
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FAIL_IF_ERROR( avformat_open_input( &h->lavf, psz_filename, format, &options ), "could not open input file\n" );
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if( options )
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av_dict_free( &options );
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FAIL_IF_ERROR( avformat_find_stream_info( h->lavf, NULL ) < 0, "could not find input stream info\n" );
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int i = 0;
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while( i < h->lavf->nb_streams && h->lavf->streams[i]->codecpar->codec_type != AVMEDIA_TYPE_VIDEO )
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i++;
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FAIL_IF_ERROR( i == h->lavf->nb_streams, "could not find video stream\n" );
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h->stream_id = i;
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h->next_frame = 0;
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h->lavc = codec_from_stream( h->lavf->streams[i] );
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if( !h->lavc )
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return -1;
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info->fps_num = h->lavf->streams[i]->avg_frame_rate.num;
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info->fps_den = h->lavf->streams[i]->avg_frame_rate.den;
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info->timebase_num = h->lavf->streams[i]->time_base.num;
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info->timebase_den = h->lavf->streams[i]->time_base.den;
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/* lavf is thread unsafe as calling av_read_frame invalidates previously read AVPackets */
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info->thread_safe = 0;
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h->vfr_input = info->vfr;
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FAIL_IF_ERROR( avcodec_open2( h->lavc, avcodec_find_decoder( h->lavc->codec_id ), NULL ),
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"could not find decoder for video stream\n" );
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/* prefetch the first frame and set/confirm flags */
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h->first_pic = malloc( sizeof(cli_pic_t) );
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FAIL_IF_ERROR( !h->first_pic || lavf_input.picture_alloc( h->first_pic, h, X264_CSP_OTHER, info->width, info->height ),
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"malloc failed\n" );
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if( read_frame_internal( h->first_pic, h, 0, info ) )
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return -1;
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info->width = h->lavc->width;
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info->height = h->lavc->height;
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info->csp = h->first_pic->img.csp;
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info->num_frames = h->lavf->streams[i]->nb_frames;
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info->sar_height = h->lavc->sample_aspect_ratio.den;
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info->sar_width = h->lavc->sample_aspect_ratio.num;
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info->fullrange |= h->lavc->color_range == AVCOL_RANGE_JPEG;
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/* avisynth stores rgb data vertically flipped. */
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if( !strcasecmp( get_filename_extension( psz_filename ), "avs" ) &&
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(h->lavc->pix_fmt == AV_PIX_FMT_BGRA || h->lavc->pix_fmt == AV_PIX_FMT_BGR24) )
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info->csp |= X264_CSP_VFLIP;
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*p_handle = h;
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return 0;
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}
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static int picture_alloc( cli_pic_t *pic, hnd_t handle, int csp, int width, int height )
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{
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if( x264_cli_pic_alloc( pic, X264_CSP_NONE, width, height ) )
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return -1;
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pic->img.csp = csp;
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pic->img.planes = 4;
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return 0;
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}
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static int read_frame( cli_pic_t *pic, hnd_t handle, int i_frame )
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{
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return read_frame_internal( pic, handle, i_frame, NULL );
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}
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static void picture_clean( cli_pic_t *pic, hnd_t handle )
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{
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memset( pic, 0, sizeof(cli_pic_t) );
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}
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static int close_file( hnd_t handle )
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{
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lavf_hnd_t *h = handle;
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avcodec_free_context( &h->lavc );
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avformat_close_input( &h->lavf );
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av_packet_free( &h->pkt );
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av_frame_free( &h->frame );
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free( h );
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return 0;
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}
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const cli_input_t lavf_input = { open_file, picture_alloc, read_frame, NULL, picture_clean, close_file };
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