mirror of https://github.com/FFmpeg/FFmpeg.git
See thread: Subject: [PATCH] movie video source Date: 2010-12-31 15:35:30 GMT Signed-off-by: Janne Grunau <janne-ffmpeg@jannau.net>oldabi
Stefano Sabatini
14 years ago
committed by
Janne Grunau
parent
0cad24ce9b
commit
9409c3811c
6 changed files with 371 additions and 1 deletions
@ -0,0 +1,311 @@ |
||||
/*
|
||||
* Copyright (c) 2010 Stefano Sabatini |
||||
* Copyright (c) 2008 Victor Paesa |
||||
* |
||||
* This file is part of FFmpeg. |
||||
* |
||||
* FFmpeg 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. |
||||
* |
||||
* FFmpeg 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 FFmpeg; 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 |
||||
*/ |
||||
|
||||
/* #define DEBUG */ |
||||
|
||||
#include <float.h> |
||||
#include "libavutil/avstring.h" |
||||
#include "libavutil/opt.h" |
||||
#include "libavcore/imgutils.h" |
||||
#include "libavformat/avformat.h" |
||||
#include "avfilter.h" |
||||
|
||||
typedef struct { |
||||
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; |
||||
AVFilterBufferRef *picref; |
||||
} MovieContext; |
||||
|
||||
#define OFFSET(x) offsetof(MovieContext, x) |
||||
|
||||
static const AVOption movie_options[]= { |
||||
{"format_name", "set format name", OFFSET(format_name), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX }, |
||||
{"f", "set format name", OFFSET(format_name), FF_OPT_TYPE_STRING, 0, CHAR_MIN, CHAR_MAX }, |
||||
{"stream_index", "set stream index", OFFSET(stream_index), FF_OPT_TYPE_INT, -1, -1, INT_MAX }, |
||||
{"si", "set stream index", OFFSET(stream_index), FF_OPT_TYPE_INT, -1, -1, INT_MAX }, |
||||
{"seek_point", "set seekpoint (seconds)", OFFSET(seek_point_d), FF_OPT_TYPE_DOUBLE, 0, 0, (INT64_MAX-1) / 1000000 }, |
||||
{"sp", "set seekpoint (seconds)", OFFSET(seek_point_d), FF_OPT_TYPE_DOUBLE, 0, 0, (INT64_MAX-1) / 1000000 }, |
||||
{NULL}, |
||||
}; |
||||
|
||||
static const char *movie_get_name(void *ctx) |
||||
{ |
||||
return "movie"; |
||||
} |
||||
|
||||
static const AVClass movie_class = { |
||||
"MovieContext", |
||||
movie_get_name, |
||||
movie_options |
||||
}; |
||||
|
||||
static int movie_init(AVFilterContext *ctx) |
||||
{ |
||||
MovieContext *movie = ctx->priv; |
||||
AVInputFormat *iformat = NULL; |
||||
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 = av_open_input_file(&movie->format_ctx, movie->file_name, iformat, 0, NULL)) < 0) { |
||||
av_log(ctx, AV_LOG_ERROR, |
||||
"Failed to av_open_input_file '%s'\n", movie->file_name); |
||||
return ret; |
||||
} |
||||
if ((ret = av_find_stream_info(movie->format_ctx)) < 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; |
||||
movie->codec_ctx = movie->format_ctx->streams[movie->stream_index]->codec; |
||||
|
||||
/*
|
||||
* 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(movie->codec_ctx->codec_id); |
||||
if (!codec) { |
||||
av_log(ctx, AV_LOG_ERROR, "Failed to find any codec\n"); |
||||
return AVERROR(EINVAL); |
||||
} |
||||
|
||||
if ((ret = avcodec_open(movie->codec_ctx, codec)) < 0) { |
||||
av_log(ctx, AV_LOG_ERROR, "Failed to open codec\n"); |
||||
return ret; |
||||
} |
||||
|
||||
if (!(movie->frame = avcodec_alloc_frame()) ) { |
||||
av_log(ctx, AV_LOG_ERROR, "Failed to alloc frame\n"); |
||||
return AVERROR(ENOMEM); |
||||
} |
||||
|
||||
movie->w = movie->codec_ctx->width; |
||||
movie->h = movie->codec_ctx->height; |
||||
|
||||
av_log(ctx, AV_LOG_INFO, "seek_point:%lld 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, const char *args, void *opaque) |
||||
{ |
||||
MovieContext *movie = ctx->priv; |
||||
int ret; |
||||
movie->class = &movie_class; |
||||
av_opt_set_defaults2(movie, 0, 0); |
||||
|
||||
if (args) |
||||
movie->file_name = av_get_token(&args, ":"); |
||||
if (!movie->file_name || !*movie->file_name) { |
||||
av_log(ctx, AV_LOG_ERROR, "No filename provided!\n"); |
||||
return AVERROR(EINVAL); |
||||
} |
||||
|
||||
if (*args++ == ':' && (ret = av_set_options_string(movie, args, "=", ":")) < 0) { |
||||
av_log(ctx, AV_LOG_ERROR, "Error parsing options string: '%s'\n", args); |
||||
return ret; |
||||
} |
||||
|
||||
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; |
||||
|
||||
av_free(movie->file_name); |
||||
av_free(movie->format_name); |
||||
if (movie->codec_ctx) |
||||
avcodec_close(movie->codec_ctx); |
||||
if (movie->format_ctx) |
||||
av_close_input_file(movie->format_ctx); |
||||
avfilter_unref_buffer(movie->picref); |
||||
av_freep(&movie->frame); |
||||
} |
||||
|
||||
static int query_formats(AVFilterContext *ctx) |
||||
{ |
||||
MovieContext *movie = ctx->priv; |
||||
enum PixelFormat pix_fmts[] = { movie->codec_ctx->pix_fmt, PIX_FMT_NONE }; |
||||
|
||||
avfilter_set_common_formats(ctx, avfilter_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; |
||||
AVStream *st = movie->format_ctx->streams[movie->stream_index]; |
||||
|
||||
if (movie->is_done == 1) |
||||
return 0; |
||||
|
||||
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) { |
||||
movie->codec_ctx->reordered_opaque = pkt.pos; |
||||
avcodec_decode_video2(movie->codec_ctx, movie->frame, &frame_decoded, &pkt); |
||||
|
||||
if (frame_decoded) { |
||||
/* FIXME: avoid the memcpy */ |
||||
movie->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE | AV_PERM_PRESERVE | |
||||
AV_PERM_REUSE2, outlink->w, outlink->h); |
||||
av_image_copy(movie->picref->data, movie->picref->linesize, |
||||
movie->frame->data, movie->frame->linesize, |
||||
movie->picref->format, outlink->w, outlink->h); |
||||
|
||||
/* FIXME: use a PTS correction mechanism as that in
|
||||
* ffplay.c when some API will be available for that */ |
||||
/* use pkt_dts if pkt_pts is not available */ |
||||
movie->picref->pts = movie->frame->pkt_pts == AV_NOPTS_VALUE ? |
||||
movie->frame->pkt_dts : movie->frame->pkt_pts; |
||||
|
||||
movie->picref->pos = movie->frame->reordered_opaque; |
||||
movie->picref->video->pixel_aspect = st->sample_aspect_ratio.num ? |
||||
st->sample_aspect_ratio : movie->codec_ctx->sample_aspect_ratio; |
||||
movie->picref->video->interlaced = movie->frame->interlaced_frame; |
||||
movie->picref->video->top_field_first = movie->frame->top_field_first; |
||||
av_dlog(outlink->src, |
||||
"movie_get_frame(): file:'%s' pts:%"PRId64" time:%lf pos:%"PRId64" aspect:%d/%d\n", |
||||
movie->file_name, movie->picref->pts, |
||||
(double)movie->picref->pts * av_q2d(st->time_base), |
||||
movie->picref->pos, |
||||
movie->picref->video->pixel_aspect.num, movie->picref->video->pixel_aspect.den); |
||||
// We got it. Free the packet since we are returning
|
||||
av_free_packet(&pkt); |
||||
|
||||
return 0; |
||||
} |
||||
} |
||||
// Free the packet that was allocated by av_read_frame
|
||||
av_free_packet(&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) |
||||
{ |
||||
AVFilterBufferRef *outpicref; |
||||
MovieContext *movie = outlink->src->priv; |
||||
int ret; |
||||
|
||||
if (movie->is_done) |
||||
return AVERROR_EOF; |
||||
if ((ret = movie_get_frame(outlink)) < 0) |
||||
return ret; |
||||
|
||||
outpicref = avfilter_ref_buffer(movie->picref, ~0); |
||||
avfilter_start_frame(outlink, outpicref); |
||||
avfilter_draw_slice(outlink, 0, outlink->h, 1); |
||||
avfilter_end_frame(outlink); |
||||
|
||||
return 0; |
||||
} |
||||
|
||||
AVFilter avfilter_vsrc_movie = { |
||||
.name = "movie", |
||||
.description = NULL_IF_CONFIG_SMALL("Read from a movie source."), |
||||
.priv_size = sizeof(MovieContext), |
||||
.init = init, |
||||
.uninit = uninit, |
||||
.query_formats = query_formats, |
||||
|
||||
.inputs = (AVFilterPad[]) {{ .name = NULL }}, |
||||
.outputs = (AVFilterPad[]) {{ .name = "default", |
||||
.type = AVMEDIA_TYPE_VIDEO, |
||||
.request_frame = request_frame, |
||||
.config_props = config_output_props, }, |
||||
{ .name = NULL}}, |
||||
}; |
||||
Loading…
Reference in new issue