Hi,
Here is attached a source filter to read video files.
Could you please review it?
Regards,
Víctor
Index: allfilters.h
===================================================================
--- allfilters.h (revision 1840)
+++ allfilters.h (working copy)
@@ -39,3 +39,4 @@
extern AVFilter avfilter_vf_split;
extern AVFilter avfilter_vf_transpose;
extern AVFilter avfilter_vf_vflip;
+extern AVFilter avfilter_vsrc_movie;
Index: Makefile
===================================================================
--- Makefile (revision 1840)
+++ Makefile (working copy)
@@ -1,6 +1,6 @@
include ../config.mak
-CFLAGS+=-I$(SRC_PATH)/libavcodec -I$(SRC_PATH)/libswscale
+CFLAGS+=-I$(SRC_PATH)/libavformat -I$(SRC_PATH)/libavcodec -I$(SRC_PATH)/libswscale
OBJS = avfilter.o \
avfiltergraph.o \
@@ -23,11 +23,13 @@
vf_split.o \
vf_transpose.o \
vf_vflip.o \
+ vsrc_movie.o \
avfiltergraphfile.o \
HEADERS = avfilter.h
-EXTRALIBS := -L$(BUILD_ROOT)/libavcodec -lavcodec$(BUILDSUF) \
+EXTRALIBS := -L$(BUILD_ROOT)/libavformat -lavformat$(BUILDSUF) \
+ -L$(BUILD_ROOT)/libavcodec -lavcodec$(BUILDSUF) \
-L$(BUILD_ROOT)/libswscale -lswscale$(BUILDSUF) \
-L$(BUILD_ROOT)/libavutil -lavutil$(BUILDSUF) $(EXTRALIBS)
Index: avfilter.c
===================================================================
--- avfilter.c (revision 1840)
+++ avfilter.c (working copy)
@@ -308,6 +308,7 @@
avfilter_register(&avfilter_vf_split);
avfilter_register(&avfilter_vf_transpose);
avfilter_register(&avfilter_vf_vflip);
+ avfilter_register(&avfilter_vsrc_movie);
}
void avfilter_uninit(void)
Index: vsrc_movie.c
===================================================================
--- vsrc_movie.c (revision 0)
+++ vsrc_movie.c (revision 0)
@@ -0,0 +1,308 @@
+/*
+ * Movie file video source filter
+ * Copyright (c) 2007 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
+ */
+
+ /*
+ # One usage example follows, usable too as test scenario.
+ #TODO Eventually move it into FFmpeg docs.
+
+;----------------------------movie.desc------------------------------
+;
+; Parameters of movie filter are
+; float seekpoint in seconds : string format : string filename
+;
+; We can overlay a second movie on top of a main one
+;
+; input -----------> deltapts0 --> overlay --> output
+; ^
+; movie --> scale--> deltapts1 ------|
+;
+
+[filters]
+movie=movie=3.2:avi:input.avi
+
+; We make both the main movie and the overlaid one start at the same time
+deltapts0=setpts=PTS-STARTPTS
+deltapts1=setpts=PTS-STARTPTS
+
+scale=scale=180:144
+overlay=overlay=16:16
+
+[links]
+deltapts0:0=overlay:0
+
+movie:0=scale:0
+scale:0=deltapts1:0
+deltapts1:0=overlay:1
+
+[inputs]
+default=deltapts0:0
+
+[outputs]
+default=overlay:0
+;----------------------------movie.desc------------------------------
+
+# Then launch it from command line
+ffmpeg -i input.avi -vfilters graph_file=movie.desc output.avi
+
+ */
+
+#include "avformat.h"
+#include "avfilter.h"
+
+typedef struct {
+ // Filter parameters
+ double seek_point;
+ char format_name[16];
+ char file_name[255];
+ // Needed to load movies
+ AVFormatContext *pFormatCtx;
+ int videoStream;
+ AVCodecContext *pCodecCtx;
+ int is_done;
+ AVFrame *pFrame;
+
+ int w, h;
+ AVFilterPicRef *pic;
+} MovieContext;
+
+int movie_init(MovieContext *mv)
+{
+ AVInputFormat *file_iformat = NULL;
+ int i;
+ AVCodec *pCodec;
+ int64_t timestamp;
+
+ //av_log(NULL, AV_LOG_INFO, "movie_init() seek:%lf format:%s file:%s\n",
+ // mv->seek_point, mv->format_name, mv->file_name);
+ av_register_all();
+ /* Try to find the movie format (container) */
+ if (*mv->format_name)
+ file_iformat = av_find_input_format(mv->format_name);
+ else
+ file_iformat = NULL;
+ mv->pFormatCtx = NULL;
+ if (av_open_input_file(&mv->pFormatCtx, mv->file_name, file_iformat, 0, NULL) != 0) {
+ av_log(NULL, AV_LOG_ERROR,
+ "movie_init() Failed to av_open_input_file '%s'\n", mv->file_name);
+ return -1;
+ }
+ if(av_find_stream_info(mv->pFormatCtx)<0) {
+ av_log(NULL, AV_LOG_ERROR, "movie_init() Failed to find stream info\n");
+ return -1;
+ }
+
+ /* if seeking requested, we execute it */
+ if (mv->seek_point > 0.0) {
+ timestamp = mv->seek_point * AV_TIME_BASE;
+ /* add the stream start time, should it exist */
+ if (mv->pFormatCtx->start_time != AV_NOPTS_VALUE)
+ timestamp += mv->pFormatCtx->start_time;
+ if (av_seek_frame(mv->pFormatCtx, -1, timestamp, AVSEEK_FLAG_BACKWARD) < 0) {
+ av_log(NULL, AV_LOG_ERROR, "%s: could not seek to position %0.3f\n",
+ mv->file_name, (double)timestamp / AV_TIME_BASE);
+ }
+ }
+
+ /* To make things nice and easy, we simply use the first video stream we find */
+ mv->videoStream=-1;
+ for(i = 0; i < mv->pFormatCtx->nb_streams; i++)
+ if(mv->pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO)
+ {
+ mv->videoStream = i;
+ break;
+ }
+ if(mv->videoStream == -1) {
+ av_log(NULL, AV_LOG_ERROR, "movie_init() No video stream found\n");
+ return -1;
+ }
+ // Get a pointer to the codec context for the video stream
+ mv->pCodecCtx = mv->pFormatCtx->streams[mv->videoStream]->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.
+ */
+ // Find the decoder for the video stream
+ pCodec = avcodec_find_decoder(mv->pCodecCtx->codec_id);
+ if(pCodec == NULL) {
+ av_log(NULL, AV_LOG_ERROR, "movie_init() Failed to find any codec\n");
+ return -1;
+ }
+
+ // Open codec
+ if(avcodec_open(mv->pCodecCtx, pCodec)<0) {
+ av_log(NULL, AV_LOG_ERROR, "movie_init() Failed to open codec\n");
+ return -1;
+ }
+
+ // Hack to correct the wrong frame rates generated by some codecs
+ if (mv->pCodecCtx->time_base.den>1000 && mv->pCodecCtx->time_base.num==1)
+ mv->pCodecCtx->time_base.num=1000;
+
+ // Allocate a video frame to store the decoded images in.
+ if(! (mv->pFrame = avcodec_alloc_frame()) ) {
+ av_log(NULL, AV_LOG_ERROR, "movie_init() Failed to alloc frame\n");
+ return -1;
+ }
+
+ mv->w = mv->pCodecCtx->width;
+ mv->h = mv->pCodecCtx->height;
+
+ return 0;
+}
+
+static int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ MovieContext *mv = ctx->priv;
+ int num_fields;
+
+ if(args) {
+ num_fields = sscanf(args, "%lf:%15[^:]:%255s",
+ &mv->seek_point, mv->format_name, mv->file_name);
+ if (3 == num_fields)
+ //av_log(NULL, AV_LOG_INFO,
+ // "init() args:'%s'\n\tseek:%lf format:%s name:%s\n",
+ // args, mv->seek_point, mv->format_name, mv->file_name);
+ /* sanity check parms */
+ if (mv->seek_point >= 0.0 && *mv->file_name)
+ return movie_init(mv);
+ }
+ else
+ av_log(ctx, AV_LOG_ERROR, "init() expected 3 arguments:'%s'\n", args);
+ return -1;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ MovieContext *mv = ctx->priv;
+
+ avfilter_set_common_formats(ctx,
+ avfilter_make_format_list(1, mv->pCodecCtx->pix_fmt));
+ return 0;
+}
+
+static int config_props(AVFilterLink *link)
+{
+ MovieContext *mv = link->src->priv;
+
+ link->w = mv->w;
+ link->h = mv->h;
+
+ return 0;
+}
+
+int movie_get_frame(AVFilterLink *link)
+{
+ AVPacket packet;
+ int frameFinished;
+
+ MovieContext *mv = link->src->priv;
+
+ if (mv->is_done == 1) return 0;
+
+ if(!mv->pic)
+ mv->pic = avfilter_get_video_buffer(link, AV_PERM_WRITE );
+ //av_log(NULL, AV_LOG_INFO, "movie_get_frame w:%d h:%d\n", mv->w, mv->h);
+
+ // Get frame
+ while(av_read_frame(mv->pFormatCtx, &packet)>=0)
+ {
+ // Is this a packet from the video stream?
+ if(packet.stream_index == mv->videoStream)
+ {
+ // Decode video frame
+ avcodec_decode_video(mv->pCodecCtx, mv->pFrame, &frameFinished,
+ packet.data, packet.size);
+
+ // Did we get a video frame?
+ if(frameFinished)
+ {
+ memcpy(mv->pic->data, mv->pFrame->data,
+ sizeof(mv->pFrame->data));
+ memcpy(mv->pic->linesize, mv->pFrame->linesize,
+ sizeof(mv->pFrame->linesize));
+
+ // Advance in the time line
+ mv->pic->pts = packet.pts * AV_TIME_BASE *
+ av_q2d(mv->pCodecCtx->time_base);
+ //av_log(NULL, AV_LOG_INFO,
+ // "movie_get_frame(%s) packet pts:%lld %lf vfpts:%lld\n",
+ // mv->file_name, packet.pts,
+ // (double)packet.pts*av_q2d(mv->pCodecCtx->time_base),
+ // mv->pic->pts);
+
+ // 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
+ mv->is_done = 1;
+ return 0;
+}
+
+static int request_frame(AVFilterLink *link)
+{
+ AVFilterPicRef *out;
+ MovieContext *mv = link->src->priv;
+
+ movie_get_frame(link);
+
+ out = avfilter_ref_pic(mv->pic, ~AV_PERM_WRITE);
+ avfilter_start_frame(link, out);
+ avfilter_draw_slice(link, 0, out->h);
+ avfilter_end_frame(link);
+
+ return 0;
+}
+
+static void uninit(AVFilterContext *ctx)
+{
+ MovieContext *mv = ctx->priv;
+
+ if(mv->pic)
+ avfilter_unref_pic(mv->pic);
+}
+
+AVFilter avfilter_vsrc_movie =
+{
+ .name = "movie",
+ .author = "Victor Paesa",
+ .priv_size = sizeof(MovieContext),
+ .query_formats = query_formats,
+
+ .init = init,
+ .uninit = uninit,
+
+ .inputs = (AVFilterPad[]) {{ .name = NULL }},
+ .outputs = (AVFilterPad[]) {{ .name = "default",
+ .type = AV_PAD_VIDEO,
+ .request_frame = request_frame,
+ .config_props = config_props, },
+ { .name = NULL}},
+};
+
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