287 lines
9.3 KiB
C
287 lines
9.3 KiB
C
/*
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* Copyright (c) 2010 Stefano Sabatini
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* Copyright (c) 2008 Victor Paesa
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* movie video source
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*
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* @todo use direct rendering (no allocation of a new frame)
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* @todo support a PTS correction mechanism
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* @todo support more than one output stream
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*/
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#include <float.h>
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#include <stdint.h>
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#include "libavutil/attributes.h"
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#include "libavutil/avstring.h"
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.h"
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#include "libavformat/avformat.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "internal.h"
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#include "video.h"
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typedef struct {
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const AVClass *class;
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int64_t seek_point; ///< seekpoint in microseconds
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double seek_point_d;
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char *format_name;
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char *file_name;
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int stream_index;
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AVFormatContext *format_ctx;
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AVCodecContext *codec_ctx;
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int is_done;
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AVFrame *frame; ///< video frame to store the decoded images in
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int w, h;
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} MovieContext;
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#define OFFSET(x) offsetof(MovieContext, x)
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
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static const AVOption movie_options[]= {
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{ "filename", NULL, OFFSET(file_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
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{ "format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
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{ "f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
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{ "stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
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{ "si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
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{ "seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
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{ "sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
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{ NULL },
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};
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static const char *movie_get_name(void *ctx)
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{
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return "movie";
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}
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static const AVClass movie_class = {
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"MovieContext",
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movie_get_name,
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movie_options
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};
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static av_cold int movie_init(AVFilterContext *ctx)
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{
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MovieContext *movie = ctx->priv;
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AVInputFormat *iformat = NULL;
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AVCodec *codec;
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int ret;
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int64_t timestamp;
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av_register_all();
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// Try to find the movie format (container)
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iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;
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movie->format_ctx = NULL;
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if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {
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av_log(ctx, AV_LOG_ERROR,
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"Failed to avformat_open_input '%s'\n", movie->file_name);
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return ret;
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}
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if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
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av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");
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// if seeking requested, we execute it
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if (movie->seek_point > 0) {
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timestamp = movie->seek_point;
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// add the stream start time, should it exist
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if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
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if (timestamp > INT64_MAX - movie->format_ctx->start_time) {
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av_log(ctx, AV_LOG_ERROR,
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"%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
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movie->file_name, movie->format_ctx->start_time, movie->seek_point);
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return AVERROR(EINVAL);
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}
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timestamp += movie->format_ctx->start_time;
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}
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if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
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movie->file_name, timestamp);
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return ret;
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}
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}
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/* select the video stream */
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if ((ret = av_find_best_stream(movie->format_ctx, AVMEDIA_TYPE_VIDEO,
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movie->stream_index, -1, NULL, 0)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "No video stream with index '%d' found\n",
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movie->stream_index);
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return ret;
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}
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movie->stream_index = ret;
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movie->codec_ctx = movie->format_ctx->streams[movie->stream_index]->codec;
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/*
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* So now we've got a pointer to the so-called codec context for our video
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* stream, but we still have to find the actual codec and open it.
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*/
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codec = avcodec_find_decoder(movie->codec_ctx->codec_id);
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if (!codec) {
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av_log(ctx, AV_LOG_ERROR, "Failed to find any codec\n");
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return AVERROR(EINVAL);
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}
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movie->codec_ctx->refcounted_frames = 1;
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if ((ret = avcodec_open2(movie->codec_ctx, codec, NULL)) < 0) {
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av_log(ctx, AV_LOG_ERROR, "Failed to open codec\n");
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return ret;
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}
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movie->w = movie->codec_ctx->width;
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movie->h = movie->codec_ctx->height;
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av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
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movie->seek_point, movie->format_name, movie->file_name,
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movie->stream_index);
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return 0;
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}
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static av_cold int init(AVFilterContext *ctx)
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{
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MovieContext *movie = ctx->priv;
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movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
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return movie_init(ctx);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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MovieContext *movie = ctx->priv;
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if (movie->codec_ctx)
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avcodec_close(movie->codec_ctx);
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if (movie->format_ctx)
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avformat_close_input(&movie->format_ctx);
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av_frame_free(&movie->frame);
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}
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static int query_formats(AVFilterContext *ctx)
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{
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MovieContext *movie = ctx->priv;
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enum AVPixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, AV_PIX_FMT_NONE };
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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return 0;
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}
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static int config_output_props(AVFilterLink *outlink)
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{
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MovieContext *movie = outlink->src->priv;
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outlink->w = movie->w;
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outlink->h = movie->h;
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outlink->time_base = movie->format_ctx->streams[movie->stream_index]->time_base;
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return 0;
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}
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static int movie_get_frame(AVFilterLink *outlink)
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{
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MovieContext *movie = outlink->src->priv;
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AVPacket pkt;
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int ret, frame_decoded;
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AVStream av_unused *st = movie->format_ctx->streams[movie->stream_index];
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if (movie->is_done == 1)
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return 0;
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movie->frame = av_frame_alloc();
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if (!movie->frame)
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return AVERROR(ENOMEM);
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while ((ret = av_read_frame(movie->format_ctx, &pkt)) >= 0) {
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// Is this a packet from the video stream?
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if (pkt.stream_index == movie->stream_index) {
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avcodec_decode_video2(movie->codec_ctx, movie->frame, &frame_decoded, &pkt);
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if (frame_decoded) {
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if (movie->frame->pkt_pts != AV_NOPTS_VALUE)
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movie->frame->pts = movie->frame->pkt_pts;
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av_dlog(outlink->src,
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"movie_get_frame(): file:'%s' pts:%"PRId64" time:%f aspect:%d/%d\n",
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movie->file_name, movie->frame->pts,
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(double)movie->frame->pts * av_q2d(st->time_base),
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movie->frame->sample_aspect_ratio.num,
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movie->frame->sample_aspect_ratio.den);
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// We got it. Free the packet since we are returning
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av_free_packet(&pkt);
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return 0;
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}
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}
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// Free the packet that was allocated by av_read_frame
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av_free_packet(&pkt);
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}
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// On multi-frame source we should stop the mixing process when
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// the movie source does not have more frames
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if (ret == AVERROR_EOF)
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movie->is_done = 1;
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return ret;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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MovieContext *movie = outlink->src->priv;
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int ret;
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if (movie->is_done)
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return AVERROR_EOF;
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if ((ret = movie_get_frame(outlink)) < 0)
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return ret;
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ret = ff_filter_frame(outlink, movie->frame);
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movie->frame = NULL;
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return ret;
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}
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static const AVFilterPad avfilter_vsrc_movie_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_VIDEO,
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.request_frame = request_frame,
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.config_props = config_output_props,
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},
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{ NULL }
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};
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AVFilter ff_vsrc_movie = {
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.name = "movie",
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.description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
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.priv_size = sizeof(MovieContext),
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.priv_class = &movie_class,
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.init = init,
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.uninit = uninit,
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.query_formats = query_formats,
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.inputs = NULL,
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.outputs = avfilter_vsrc_movie_outputs,
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};
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