1 /*****************************************************************************
2 * lavf.c: libavformat input
3 *****************************************************************************
4 * Copyright (C) 2009-2011 x264 project
6 * Authors: Mike Gurlitz <mike.gurlitz@gmail.com>
7 * Steven Walters <kemuri9@gmail.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
23 * This program is also available under a commercial proprietary license.
24 * For more information, contact us at licensing@x264.com.
25 *****************************************************************************/
28 #define FAIL_IF_ERROR( cond, ... ) FAIL_IF_ERR( cond, "lavf", __VA_ARGS__ )
29 #undef DECLARE_ALIGNED
30 #include <libavformat/avformat.h>
31 #include <libavutil/pixdesc.h>
32 #include <libavutil/dict.h>
36 AVFormatContext *lavf;
43 #define x264_free_packet( pkt )\
45 av_free_packet( pkt );\
46 av_init_packet( pkt );\
49 static int read_frame_internal( cli_pic_t *p_pic, lavf_hnd_t *h, int i_frame, video_info_t *info )
51 if( h->first_pic && !info )
53 /* see if the frame we are requesting is the frame we have already read and stored.
54 * if so, retrieve the pts and image data before freeing it. */
57 XCHG( cli_image_t, p_pic->img, h->first_pic->img );
58 p_pic->pts = h->first_pic->pts;
59 XCHG( void*, p_pic->opaque, h->first_pic->opaque );
61 lavf_input.release_frame( h->first_pic, NULL );
62 lavf_input.picture_clean( h->first_pic );
69 AVCodecContext *c = h->lavf->streams[h->stream_id]->codec;
70 AVPacket *pkt = p_pic->opaque;
72 avcodec_get_frame_defaults( &frame );
74 while( i_frame >= h->next_frame )
80 ret = av_read_frame( h->lavf, pkt );
82 if( pkt->stream_index == h->stream_id )
87 c->reordered_opaque = pkt->pts;
88 if( avcodec_decode_video2( c, &frame, &finished, pkt ) < 0 )
89 x264_cli_log( "lavf", X264_LOG_WARNING, "video decoding failed on frame %d\n", h->next_frame );
91 /* if the packet successfully decoded but the data from it is not desired, free it */
93 x264_free_packet( pkt );
94 } while( !finished && ret >= 0 );
102 memcpy( p_pic->img.stride, frame.linesize, sizeof(p_pic->img.stride) );
103 memcpy( p_pic->img.plane, frame.data, sizeof(p_pic->img.plane) );
104 p_pic->img.height = c->height;
105 p_pic->img.csp = c->pix_fmt | X264_CSP_OTHER;
106 p_pic->img.width = c->width;
110 info->interlaced = frame.interlaced_frame;
111 info->tff = frame.top_field_first;
116 p_pic->pts = p_pic->duration = 0;
117 if( c->has_b_frames && frame.reordered_opaque != AV_NOPTS_VALUE )
118 p_pic->pts = frame.reordered_opaque;
119 else if( pkt->dts != AV_NOPTS_VALUE )
120 p_pic->pts = pkt->dts; // for AVI files
123 h->vfr_input = info->vfr = 0;
131 static int open_file( char *psz_filename, hnd_t *p_handle, video_info_t *info, cli_input_opt_t *opt )
133 lavf_hnd_t *h = calloc( 1, sizeof(lavf_hnd_t) );
137 if( !strcmp( psz_filename, "-" ) )
138 psz_filename = "pipe:";
140 /* if resolution was passed in, place it and colorspace into options. this allows raw video support */
141 AVDictionary *options = NULL;
142 if( opt->resolution )
144 av_dict_set( &options, "video_size", opt->resolution, 0 );
145 const char *csp = opt->colorspace ? opt->colorspace : av_get_pix_fmt_name( PIX_FMT_YUV420P );
146 av_dict_set( &options, "pixel_format", csp, 0 );
149 /* specify the input format. this is helpful when lavf fails to guess */
150 AVInputFormat *format = NULL;
152 FAIL_IF_ERROR( !(format = av_find_input_format( opt->format )), "unknown file format: %s\n", opt->format );
154 FAIL_IF_ERROR( avformat_open_input( &h->lavf, psz_filename, format, &options ), "could not open input file\n" )
156 av_dict_free( &options );
157 FAIL_IF_ERROR( avformat_find_stream_info( h->lavf, NULL ) < 0, "could not find input stream info\n" )
160 while( i < h->lavf->nb_streams && h->lavf->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO )
162 FAIL_IF_ERROR( i == h->lavf->nb_streams, "could not find video stream\n" )
165 AVCodecContext *c = h->lavf->streams[i]->codec;
166 info->fps_num = h->lavf->streams[i]->r_frame_rate.num;
167 info->fps_den = h->lavf->streams[i]->r_frame_rate.den;
168 info->timebase_num = h->lavf->streams[i]->time_base.num;
169 info->timebase_den = h->lavf->streams[i]->time_base.den;
170 /* lavf is thread unsafe as calling av_read_frame invalidates previously read AVPackets */
171 info->thread_safe = 0;
172 h->vfr_input = info->vfr;
173 FAIL_IF_ERROR( avcodec_open2( c, avcodec_find_decoder( c->codec_id ), NULL ),
174 "could not find decoder for video stream\n" )
176 /* prefetch the first frame and set/confirm flags */
177 h->first_pic = malloc( sizeof(cli_pic_t) );
178 FAIL_IF_ERROR( !h->first_pic || lavf_input.picture_alloc( h->first_pic, X264_CSP_OTHER, info->width, info->height ),
180 else if( read_frame_internal( h->first_pic, h, 0, info ) )
183 info->width = c->width;
184 info->height = c->height;
185 info->csp = h->first_pic->img.csp;
186 info->num_frames = h->lavf->streams[i]->nb_frames;
187 info->sar_height = c->sample_aspect_ratio.den;
188 info->sar_width = c->sample_aspect_ratio.num;
190 /* avisynth stores rgb data vertically flipped. */
191 if( !strcasecmp( get_filename_extension( psz_filename ), "avs" ) &&
192 (c->pix_fmt == PIX_FMT_BGRA || c->pix_fmt == PIX_FMT_BGR24) )
193 info->csp |= X264_CSP_VFLIP;
200 static int picture_alloc( cli_pic_t *pic, int csp, int width, int height )
202 if( x264_cli_pic_alloc( pic, csp, width, height ) )
205 pic->opaque = malloc( sizeof(AVPacket) );
208 av_init_packet( pic->opaque );
212 static int read_frame( cli_pic_t *pic, hnd_t handle, int i_frame )
214 return read_frame_internal( pic, handle, i_frame, NULL );
217 static int release_frame( cli_pic_t *pic, hnd_t handle )
219 x264_free_packet( pic->opaque );
223 static void picture_clean( cli_pic_t *pic )
226 memset( pic, 0, sizeof(cli_pic_t) );
229 static int close_file( hnd_t handle )
231 lavf_hnd_t *h = handle;
232 avcodec_close( h->lavf->streams[h->stream_id]->codec );
233 av_close_input_file( h->lavf );
238 const cli_input_t lavf_input = { open_file, picture_alloc, read_frame, release_frame, picture_clean, close_file };