[PATCH 3/4] Add movie video source.
Stefano Sabatini
stefano.sabatini-lala
Sun Oct 31 17:37:10 CET 2010
---
doc/filters.texi | 35 ++++++
libavfilter/Makefile | 2 +
libavfilter/allfilters.c | 1 +
libavfilter/vsrc_movie.c | 289 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 327 insertions(+), 0 deletions(-)
create mode 100644 libavfilter/vsrc_movie.c
diff --git a/doc/filters.texi b/doc/filters.texi
index 19c4d29..6573216 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -343,6 +343,41 @@ For example to horizontally flip the video in input with
ffmpeg -i in.avi -vf "hflip" out.avi
@end example
+ at section movie
+
+Read a video stream from a movie container.
+
+It accepts the syntax:
+ at example
+ at var{seekpoint}:@var{format}:@var{filename}[:@var{video_stream}]
+ at end example
+
+ at var{seekpoint} specifies the seek point in microseconds, the frames
+will be output starting from this seek point.
+
+ at var{format} specifies the assumed format for the input file, and can
+be either the name of a container of an input device.
+
+ at var{filename} specifies the name of the input file.
+
+ at var{video_stream} is optional specifies the index of the video stream
+to read. If the value is negative, the first available video stream
+will be used. Default value is "-1".
+
+It is possible to overlay a second movie on top of another source as
+shown in this graph:
+ at example
+input -----------> deltapts0 --> overlay --> output
+ ^
+ |
+movie --> scale--> deltapts1 -------+
+ at end example
+
+Follows an example:
+ at example
+"movie=3200000:avi:in.avi, scale=180:-1, setpts=PTS-STARTPTS [movie]; [in] setpts=PTS-START_PTS, [movie] overlay=16:16 [out]"
+ at end example
+
@section noformat
Force libavfilter not to use any of the specified pixel formats for the
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 9dc92be..a2d3a55 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -2,6 +2,7 @@ include $(SUBDIR)../config.mak
NAME = avfilter
FFLIBS = avcodec avcore avutil
+FFLIBS-$(CONFIG_MOVIE_FILTER) += avformat
FFLIBS-$(CONFIG_SCALE_FILTER) += swscale
HEADERS = avfilter.h
@@ -46,6 +47,7 @@ OBJS-$(CONFIG_YADIF_FILTER) += vf_yadif.o
OBJS-$(CONFIG_BUFFER_FILTER) += vsrc_buffer.o
OBJS-$(CONFIG_COLOR_FILTER) += vf_pad.o
+OBJS-$(CONFIG_MOVIE_FILTER) += vsrc_movie.o
OBJS-$(CONFIG_NULLSRC_FILTER) += vsrc_nullsrc.o
OBJS-$(CONFIG_NULLSINK_FILTER) += vsink_nullsink.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index 8ba0b62..09b6c60 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -66,6 +66,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (BUFFER, buffer, vsrc);
REGISTER_FILTER (COLOR, color, vsrc);
+ REGISTER_FILTER (MOVIE, movie, vsrc);
REGISTER_FILTER (NULLSRC, nullsrc, vsrc);
REGISTER_FILTER (NULLSINK, nullsink, vsink);
diff --git a/libavfilter/vsrc_movie.c b/libavfilter/vsrc_movie.c
new file mode 100644
index 0000000..46a175e
--- /dev/null
+++ b/libavfilter/vsrc_movie.c
@@ -0,0 +1,289 @@
+/*
+ * 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 file video source filter
+ *
+ * @todo this filter should use direct rendering (no allocation of a
+ * new frame) to be acceptable to the FFmpeg main repository
+ */
+
+#define DEBUG
+
+#include "libavcore/imgutils.h"
+#include "libavformat/avformat.h"
+#include "avfilter.h"
+
+typedef struct {
+ int64_t seek_point; ///< seekpoint in microseconds
+ char format_name[16];
+ char file_name[255];
+
+ AVFormatContext *format_ctx;
+ int video_stream;
+ AVCodecContext *codec_ctx;
+ int is_done;
+ AVFrame *frame; ///< video frame to store the decoded images in
+
+ int w, h;
+ AVFilterBufferRef *picref;
+} MovieContext;
+
+static int movie_init(AVFilterContext *ctx)
+{
+ MovieContext *movie = ctx->priv;
+ AVInputFormat *iformat = NULL;
+ int i, ret;
+ AVCodec *codec;
+ int64_t timestamp;
+
+ av_register_all();
+
+ // Try to find the movie format (container)
+ if (*movie->format_name)
+ iformat = av_find_input_format(movie->format_name);
+ else
+ iformat = 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_ERROR, "Failed to find stream info\n");
+ return ret;
+ }
+
+ // 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)
+ timestamp += movie->format_ctx->start_time;
+ if (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);
+ }
+ }
+
+ /* find the first available video stream */
+ if (movie->video_stream < 0) {
+ for (i = 0; i < movie->format_ctx->nb_streams; i++)
+ if (movie->format_ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
+ movie->video_stream = i;
+ break;
+ }
+ if (movie->video_stream < 0) {
+ av_log(ctx, AV_LOG_ERROR, "No video stream found\n");
+ return AVERROR(EINVAL);
+ }
+ } else {
+ if (movie->format_ctx->nb_streams < (movie->video_stream+1) ||
+ movie->format_ctx->streams[movie->video_stream]->codec->codec_type != AVMEDIA_TYPE_VIDEO) {
+ av_log(ctx, AV_LOG_ERROR, "No video stream with index '%d' found\n",
+ movie->video_stream);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ // Get a pointer to the codec context for the video stream
+ movie->codec_ctx = movie->format_ctx->streams[movie->video_stream]->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:%lld format:%s file:%s video_stream:%d\n",
+ movie->seek_point, movie->format_name, movie->file_name,
+ movie->video_stream);
+
+ return 0;
+}
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ MovieContext *movie = ctx->priv;
+
+ movie->video_stream = -1;
+
+ if (!args || sscanf(args, "%"PRId64":%15[^:]:%255[^:]:%d",
+ &movie->seek_point, movie->format_name,
+ movie->file_name, &movie->video_stream) < 3) {
+ av_log(ctx, AV_LOG_ERROR, "Expected at least 3 arguments in arguments list: '%s'\n", args);
+ return AVERROR(EINVAL);
+ }
+
+ if (movie->seek_point < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid negative value for seekpoint:%"PRId64"\n",
+ movie->seek_point);
+ return AVERROR(EINVAL);
+ }
+
+ return movie_init(ctx);
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ MovieContext *movie = ctx->priv;
+
+ if (movie->codec_ctx)
+ avcodec_close(movie->codec_ctx);
+ if (movie->format_ctx)
+ av_close_input_file(movie->format_ctx);
+ av_freep(&movie->frame);
+ if (movie->picref)
+ avfilter_unref_buffer(movie->picref);
+}
+
+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->video_stream]->time_base;
+
+ return 0;
+}
+
+static int movie_get_frame(AVFilterLink *outlink)
+{
+ AVPacket packet;
+ int frame_finished;
+
+ MovieContext *movie = outlink->src->priv;
+
+ if (movie->is_done == 1)
+ return 0;
+
+ if (!movie->picref)
+ movie->picref = avfilter_get_video_buffer(outlink,
+ AV_PERM_WRITE | AV_PERM_PRESERVE | AV_PERM_REUSE2,
+ outlink->w, outlink->h);
+
+ while (av_read_frame(movie->format_ctx, &packet) >= 0) {
+ // Is this a packet from the video stream?
+ if (packet.stream_index == movie->video_stream) {
+ // Decode video frame
+ avcodec_decode_video2(movie->codec_ctx, movie->frame, &frame_finished, &packet);
+
+ // Did we get a video frame?
+ if (frame_finished) {
+ av_image_copy(movie->picref->data, movie->picref->linesize,
+ movie->frame ->data, movie->frame ->linesize,
+ movie->picref->format, outlink->w, outlink->h);
+
+ movie->picref->pts = packet.pts;
+ movie->picref->pos = packet.pos;
+ movie->picref->video->pixel_aspect = 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;
+
+#ifdef DEBUG
+ av_log(outlink->src, AV_LOG_DEBUG,
+ "movie_get_frame(): file:'%s' pkt.pts:%"PRId64" t:%lf pts:%"PRId64"\n",
+ movie->file_name, packet.pts,
+ (double)packet.pts * av_q2d(movie->format_ctx->streams[movie->video_stream]->time_base),
+ movie->picref->pts);
+#endif
+
+ // We got it. Free the packet since we are returning
+ av_free_packet(&packet);
+
+ return 0;
+ }
+ }
+ // Free the packet that was allocated by av_read_frame
+ av_free_packet(&packet);
+ }
+
+ // On multi-frame source we should stop the mixing process when
+ // the movie source does not have more frames
+ movie->is_done = 1;
+ return 0;
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFilterBufferRef *outpicref;
+ MovieContext *movie = outlink->src->priv;
+
+ movie_get_frame(outlink);
+
+ if (movie->is_done)
+ return AVERROR_EOF;
+
+ 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),
+ .query_formats = query_formats,
+
+ .init = init,
+ .uninit = uninit,
+
+ .inputs = (AVFilterPad[]) {{ .name = NULL }},
+ .outputs = (AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = request_frame,
+ .config_props = config_output_props, },
+ { .name = NULL}},
+};
--
1.7.1
--DocE+STaALJfprDB--
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