FFmpeg/libavfilter/vsrc_movie.c
2016-06-21 19:54:42 +02:00

293 lines
9.4 KiB
C

/*
* Copyright (c) 2010 Stefano Sabatini
* Copyright (c) 2008 Victor Paesa
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* movie video source
*
* @todo use direct rendering (no allocation of a new frame)
* @todo support a PTS correction mechanism
* @todo support more than one output stream
*/
#include <float.h>
#include <stdint.h>
#include "libavutil/attributes.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavformat/avformat.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"
typedef struct MovieContext {
const AVClass *class;
int64_t seek_point; ///< seekpoint in microseconds
double seek_point_d;
char *format_name;
char *file_name;
int stream_index;
AVFormatContext *format_ctx;
AVCodecContext *codec_ctx;
int is_done;
AVFrame *frame; ///< video frame to store the decoded images in
int w, h;
} MovieContext;
#define OFFSET(x) offsetof(MovieContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
static const AVOption movie_options[]= {
{ "filename", NULL, OFFSET(file_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "format_name", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "f", "set format name", OFFSET(format_name), AV_OPT_TYPE_STRING, .flags = FLAGS },
{ "stream_index", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
{ "si", "set stream index", OFFSET(stream_index), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, FLAGS },
{ "seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
{ "sp", "set seekpoint (seconds)", OFFSET(seek_point_d), AV_OPT_TYPE_DOUBLE, { .dbl = 0 }, 0, (INT64_MAX-1) / 1000000, FLAGS },
{ NULL },
};
static const char *movie_get_name(void *ctx)
{
return "movie";
}
static const AVClass movie_class = {
"MovieContext",
movie_get_name,
movie_options
};
static av_cold int movie_init(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
AVInputFormat *iformat = NULL;
AVStream *st;
AVCodec *codec;
int ret;
int64_t timestamp;
av_register_all();
// Try to find the movie format (container)
iformat = movie->format_name ? av_find_input_format(movie->format_name) : NULL;
movie->format_ctx = NULL;
if ((ret = avformat_open_input(&movie->format_ctx, movie->file_name, iformat, NULL)) < 0) {
av_log(ctx, AV_LOG_ERROR,
"Failed to avformat_open_input '%s'\n", movie->file_name);
return ret;
}
if ((ret = avformat_find_stream_info(movie->format_ctx, NULL)) < 0)
av_log(ctx, AV_LOG_WARNING, "Failed to find stream info\n");
// if seeking requested, we execute it
if (movie->seek_point > 0) {
timestamp = movie->seek_point;
// add the stream start time, should it exist
if (movie->format_ctx->start_time != AV_NOPTS_VALUE) {
if (timestamp > INT64_MAX - movie->format_ctx->start_time) {
av_log(ctx, AV_LOG_ERROR,
"%s: seek value overflow with start_time:%"PRId64" seek_point:%"PRId64"\n",
movie->file_name, movie->format_ctx->start_time, movie->seek_point);
return AVERROR(EINVAL);
}
timestamp += movie->format_ctx->start_time;
}
if ((ret = av_seek_frame(movie->format_ctx, -1, timestamp, AVSEEK_FLAG_BACKWARD)) < 0) {
av_log(ctx, AV_LOG_ERROR, "%s: could not seek to position %"PRId64"\n",
movie->file_name, timestamp);
return ret;
}
}
/* select the video stream */
if ((ret = av_find_best_stream(movie->format_ctx, AVMEDIA_TYPE_VIDEO,
movie->stream_index, -1, NULL, 0)) < 0) {
av_log(ctx, AV_LOG_ERROR, "No video stream with index '%d' found\n",
movie->stream_index);
return ret;
}
movie->stream_index = ret;
st = movie->format_ctx->streams[movie->stream_index];
/*
* So now we've got a pointer to the so-called codec context for our video
* stream, but we still have to find the actual codec and open it.
*/
codec = avcodec_find_decoder(st->codecpar->codec_id);
if (!codec) {
av_log(ctx, AV_LOG_ERROR, "Failed to find any codec\n");
return AVERROR(EINVAL);
}
movie->codec_ctx = avcodec_alloc_context3(codec);
if (!movie->codec_ctx)
return AVERROR(ENOMEM);
ret = avcodec_parameters_to_context(movie->codec_ctx, st->codecpar);
if (ret < 0)
return ret;
movie->codec_ctx->refcounted_frames = 1;
if ((ret = avcodec_open2(movie->codec_ctx, codec, NULL)) < 0) {
av_log(ctx, AV_LOG_ERROR, "Failed to open codec\n");
return ret;
}
movie->w = movie->codec_ctx->width;
movie->h = movie->codec_ctx->height;
av_log(ctx, AV_LOG_VERBOSE, "seek_point:%"PRIi64" format_name:%s file_name:%s stream_index:%d\n",
movie->seek_point, movie->format_name, movie->file_name,
movie->stream_index);
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
movie->seek_point = movie->seek_point_d * 1000000 + 0.5;
return movie_init(ctx);
}
static av_cold void uninit(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
avcodec_free_context(&movie->codec_ctx);
if (movie->format_ctx)
avformat_close_input(&movie->format_ctx);
av_frame_free(&movie->frame);
}
static int query_formats(AVFilterContext *ctx)
{
MovieContext *movie = ctx->priv;
enum AVPixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, AV_PIX_FMT_NONE };
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int config_output_props(AVFilterLink *outlink)
{
MovieContext *movie = outlink->src->priv;
outlink->w = movie->w;
outlink->h = movie->h;
outlink->time_base = movie->format_ctx->streams[movie->stream_index]->time_base;
return 0;
}
static int movie_get_frame(AVFilterLink *outlink)
{
MovieContext *movie = outlink->src->priv;
AVPacket pkt;
int ret, frame_decoded;
if (movie->is_done == 1)
return 0;
movie->frame = av_frame_alloc();
if (!movie->frame)
return AVERROR(ENOMEM);
while ((ret = av_read_frame(movie->format_ctx, &pkt)) >= 0) {
// Is this a packet from the video stream?
if (pkt.stream_index == movie->stream_index) {
avcodec_decode_video2(movie->codec_ctx, movie->frame, &frame_decoded, &pkt);
if (frame_decoded) {
av_log(outlink->src, AV_LOG_TRACE,
"movie_get_frame(): file:'%s' pts:%"PRId64" time:%f aspect:%d/%d\n",
movie->file_name, movie->frame->pts,
(double)movie->frame->pts *
av_q2d(movie->format_ctx->streams[movie->stream_index]->time_base),
movie->frame->sample_aspect_ratio.num,
movie->frame->sample_aspect_ratio.den);
// We got it. Free the packet since we are returning
av_packet_unref(&pkt);
return 0;
}
}
// Free the packet that was allocated by av_read_frame
av_packet_unref(&pkt);
}
// On multi-frame source we should stop the mixing process when
// the movie source does not have more frames
if (ret == AVERROR_EOF)
movie->is_done = 1;
return ret;
}
static int request_frame(AVFilterLink *outlink)
{
MovieContext *movie = outlink->src->priv;
int ret;
if (movie->is_done)
return AVERROR_EOF;
if ((ret = movie_get_frame(outlink)) < 0)
return ret;
ret = ff_filter_frame(outlink, movie->frame);
movie->frame = NULL;
return ret;
}
static const AVFilterPad avfilter_vsrc_movie_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.config_props = config_output_props,
},
{ NULL }
};
AVFilter ff_vsrc_movie = {
.name = "movie",
.description = NULL_IF_CONFIG_SMALL("Read from a movie source."),
.priv_size = sizeof(MovieContext),
.priv_class = &movie_class,
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = NULL,
.outputs = avfilter_vsrc_movie_outputs,
};