1/* 2 * Copyright (c) 2010 Stefano Sabatini 3 * Copyright (c) 2008 Victor Paesa 4 * 5 * This file is part of Libav. 6 * 7 * Libav is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * Libav is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with Libav; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * movie video source 25 * 26 * @todo use direct rendering (no allocation of a new frame) 27 * @todo support a PTS correction mechanism 28 * @todo support more than one output stream 29 */ 30 31/* #define DEBUG */ 32 33#include <float.h> 34#include "libavutil/avstring.h" 35#include "libavutil/opt.h" 36#include "libavutil/imgutils.h" 37#include "libavformat/avformat.h" 38#include "avfilter.h" 39 40typedef struct { 41 const AVClass *class; 42 int64_t seek_point; ///< seekpoint in microseconds 43 double seek_point_d; 44 char *format_name; 45 char *file_name; 46 int stream_index; 47 48 AVFormatContext *format_ctx; 49 AVCodecContext *codec_ctx; 50 int is_done; 51 AVFrame *frame; ///< video frame to store the decoded images in 52 53 int w, h; 54 AVFilterBufferRef *picref; 55} MovieContext; 56 57#define OFFSET(x) offsetof(MovieContext, x) 58 59static const AVOption movie_options[]= { 60{"format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX }, 61{"f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, {.str = 0}, CHAR_MIN, CHAR_MAX }, 62{"stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX }, 63{"si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX }, 64{"seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 }, 65{"sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, {.dbl = 0}, 0, (INT64_MAX-1) / 1000000 }, 66{NULL}, 67}; 68 69static const char *movie_get_name(void *ctx) 70{ 71 return "movie"; 72} 73 74static const AVClass movie_class = { 75 "MovieContext", 76 movie_get_name, 77 movie_options 78}; 79 80static int movie_init(AVFilterContext *ctx) 81{ 82 MovieContext *movie = ctx->priv; 83 AVInputFormat *iformat = NULL; 84 AVCodec *codec; 85 int ret; 86 int64_t timestamp; 87 88 av_register_all(); 89 90 // Try to find the movie format (container) 91 iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL; 92 93 movie->format_ctx = NULL; 94 if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) { 95 av_log(ctx, AV_LOG_ERROR, 96 "Failed to avformat_open_input '%s'\n", movie->file_name); 97 return ret; 98 } 99 if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0) 100 av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n"); 101 102 // if seeking requested, we execute it 103 if (movie->seek_point > 0) { 104 timestamp = movie->seek_point; 105 // add the stream start time, should it exist 106 if (movie->format_ctx->start_time != AV_NOPTS_VALUE) { 107 if (timestamp > INT64_MAX - movie->format_ctx->start_time) { 108 av_log(ctx, AV_LOG_ERROR, 109 "%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n", 110 movie->file_name, movie->format_ctx->start_time, movie->seek_point); 111 return AVERROR(EINVAL); 112 } 113 timestamp += movie->format_ctx->start_time; 114 } 115 if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) { 116 av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n", 117 movie->file_name, timestamp); 118 return ret; 119 } 120 } 121 122 /* select the video stream */ 123 if ((ret = av_find_best_stream(movie->format_ctx, AVMEDIA_TYPE_VIDEO, 124 movie->stream_index, -1, NULL, 0)) < 0) { 125 av_log(ctx, AV_LOG_ERROR, "No video stream with index '%d' found\n", 126 movie->stream_index); 127 return ret; 128 } 129 movie->stream_index = ret; 130 movie->codec_ctx = movie->format_ctx->streams[movie->stream_index]->codec; 131 132 /* 133 * So now we've got a pointer to the so-called codec context for our video 134 * stream, but we still have to find the actual codec and open it. 135 */ 136 codec = avcodec_find_decoder(movie->codec_ctx->codec_id); 137 if (!codec) { 138 av_log(ctx, AV_LOG_ERROR, "Failed to find any codec\n"); 139 return AVERROR(EINVAL); 140 } 141 142 if ((ret = avcodec_open2(movie->codec_ctx, codec, NULL)) < 0) { 143 av_log(ctx, AV_LOG_ERROR, "Failed to open codec\n"); 144 return ret; 145 } 146 147 if (!(movie->frame = avcodec_alloc_frame()) ) { 148 av_log(ctx, AV_LOG_ERROR, "Failed to alloc frame\n"); 149 return AVERROR(ENOMEM); 150 } 151 152 movie->w = movie->codec_ctx->width; 153 movie->h = movie->codec_ctx->height; 154 155 av_log(ctx, AV_LOG_INFO, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n", 156 movie->seek_point, movie->format_name, movie->file_name, 157 movie->stream_index); 158 159 return 0; 160} 161 162static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) 163{ 164 MovieContext *movie = ctx->priv; 165 int ret; 166 movie->class = &movie_class; 167 av_opt_set_defaults(movie); 168 169 if (args) 170 movie->file_name = av_get_token(&args, ":"); 171 if (!movie->file_name || !*movie->file_name) { 172 av_log(ctx, AV_LOG_ERROR, "No filename provided!\n"); 173 return AVERROR(EINVAL); 174 } 175 176 if (*args++ == ':' && (ret = av_set_options_string(movie, args, "=", ":")) < 0) { 177 av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args); 178 return ret; 179 } 180 181 movie->seek_point = movie->seek_point_d * 1000000 + 0.5; 182 183 return movie_init(ctx); 184} 185 186static av_cold void uninit(AVFilterContext *ctx) 187{ 188 MovieContext *movie = ctx->priv; 189 190 av_free(movie->file_name); 191 av_free(movie->format_name); 192 if (movie->codec_ctx) 193 avcodec_close(movie->codec_ctx); 194 if (movie->format_ctx) 195 avformat_close_input(&movie->format_ctx); 196 avfilter_unref_buffer(movie->picref); 197 av_freep(&movie->frame); 198} 199 200static int query_formats(AVFilterContext *ctx) 201{ 202 MovieContext *movie = ctx->priv; 203 enum PixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, PIX_FMT_NONE }; 204 205 avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts)); 206 return 0; 207} 208 209static int config_output_props(AVFilterLink *outlink) 210{ 211 MovieContext *movie = outlink->src->priv; 212 213 outlink->w = movie->w; 214 outlink->h = movie->h; 215 outlink->time_base = movie->format_ctx->streams[movie->stream_index]->time_base; 216 217 return 0; 218} 219 220static int movie_get_frame(AVFilterLink *outlink) 221{ 222 MovieContext *movie = outlink->src->priv; 223 AVPacket pkt; 224 int ret, frame_decoded; 225 AVStream *st = movie->format_ctx->streams[movie->stream_index]; 226 227 if (movie->is_done == 1) 228 return 0; 229 230 while ((ret = av_read_frame(movie->format_ctx, &pkt)) >= 0) { 231 // Is this a packet from the video stream? 232 if (pkt.stream_index == movie->stream_index) { 233 movie->codec_ctx->reordered_opaque = pkt.pos; 234 avcodec_decode_video2(movie->codec_ctx, movie->frame, &frame_decoded, &pkt); 235 236 if (frame_decoded) { 237 /* FIXME: avoid the memcpy */ 238 movie->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE | AV_PERM_PRESERVE | 239 AV_PERM_REUSE2, outlink->w, outlink->h); 240 av_image_copy(movie->picref->data, movie->picref->linesize, 241 movie->frame->data, movie->frame->linesize, 242 movie->picref->format, outlink->w, outlink->h); 243 avfilter_copy_frame_props(movie->picref, movie->frame); 244 245 /* FIXME: use a PTS correction mechanism as that in 246 * ffplay.c when some API will be available for that */ 247 /* use pkt_dts if pkt_pts is not available */ 248 movie->picref->pts = movie->frame->pkt_pts == AV_NOPTS_VALUE ? 249 movie->frame->pkt_dts : movie->frame->pkt_pts; 250 251 movie->picref->pos = movie->frame->reordered_opaque; 252 if (!movie->frame->sample_aspect_ratio.num) 253 movie->picref->video->pixel_aspect = st->sample_aspect_ratio; 254 av_dlog(outlink->src, 255 "movie_get_frame(): file:'%s' pts:%"PRId64" time:%lf pos:%"PRId64" aspect:%d/%d\n", 256 movie->file_name, movie->picref->pts, 257 (double)movie->picref->pts * av_q2d(st->time_base), 258 movie->picref->pos, 259 movie->picref->video->pixel_aspect.num, movie->picref->video->pixel_aspect.den); 260 // We got it. Free the packet since we are returning 261 av_free_packet(&pkt); 262 263 return 0; 264 } 265 } 266 // Free the packet that was allocated by av_read_frame 267 av_free_packet(&pkt); 268 } 269 270 // On multi-frame source we should stop the mixing process when 271 // the movie source does not have more frames 272 if (ret == AVERROR_EOF) 273 movie->is_done = 1; 274 return ret; 275} 276 277static int request_frame(AVFilterLink *outlink) 278{ 279 AVFilterBufferRef *outpicref; 280 MovieContext *movie = outlink->src->priv; 281 int ret; 282 283 if (movie->is_done) 284 return AVERROR_EOF; 285 if ((ret = movie_get_frame(outlink)) < 0) 286 return ret; 287 288 outpicref = avfilter_ref_buffer(movie->picref, ~0); 289 avfilter_start_frame(outlink, outpicref); 290 avfilter_draw_slice(outlink, 0, outlink->h, 1); 291 avfilter_end_frame(outlink); 292 avfilter_unref_buffer(movie->picref); 293 movie->picref = NULL; 294 295 return 0; 296} 297 298AVFilter avfilter_vsrc_movie = { 299 .name = "movie", 300 .description = NULL_IF_CONFIG_SMALL("Read from a movie source."), 301 .priv_size = sizeof(MovieContext), 302 .init = init, 303 .uninit = uninit, 304 .query_formats = query_formats, 305 306 .inputs = (AVFilterPad[]) {{ .name = NULL }}, 307 .outputs = (AVFilterPad[]) {{ .name = "default", 308 .type = AVMEDIA_TYPE_VIDEO, 309 .request_frame = request_frame, 310 .config_props = config_output_props, }, 311 { .name = NULL}}, 312}; 313