avformat/flvenc: add add_keyframe_index option

Add keyframe index metadata
Used to facilitate seeking; particularly for HTTP pseudo streaming.
 1. read live streaming or file by sequence
 2. if use add_keyframe_index option, add a mark flag at the position,
    use to insert new context at the last step.
 3. add the keyframes *offset* and *timestamp* into a list
 4. if use add_keyframe_index option, shift the metadata data from
    mark flag offset
 5. insert the keyframes *offset* and *timestamp* from the list by
    sequence
 6. free the list
 7. end.

Add FATE test case;
Reviewed-by: Lou Logan <lou@lrcd.com>
Signed-off-by: Steven Liu <liuqi@gosun.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

doc/muxers.texi

@@ -147,6 +147,9 @@ Place AAC sequence header based on audio stream data.
 
 @item no_sequence_end
 Disable sequence end tag.
+
+@item add_keyframe_index
+Used to facilitate seeking; particularly for HTTP pseudo streaming.
 @end table
 @end table
 

tests/Makefile

@@ -132,6 +132,7 @@ include $(SRC_PATH)/tests/fate/fifo-muxer.mak
 include $(SRC_PATH)/tests/fate/filter-audio.mak
 include $(SRC_PATH)/tests/fate/filter-video.mak
 include $(SRC_PATH)/tests/fate/flac.mak
+include $(SRC_PATH)/tests/fate/flvenc.mak
 include $(SRC_PATH)/tests/fate/gapless.mak
 include $(SRC_PATH)/tests/fate/gif.mak
 include $(SRC_PATH)/tests/fate/h264.mak

tests/fate-run.sh

@@ -129,6 +129,10 @@ framecrc(){
     ffmpeg "$@" -flags +bitexact -fflags +bitexact -f framecrc -
 }
 
+ffmetadata(){
+    ffmpeg "$@" -flags +bitexact -fflags +bitexact -f ffmetadata -
+}
+
 framemd5(){
     ffmpeg "$@" -flags +bitexact -fflags +bitexact -f framemd5 -
 }

tests/fate/flvenc.mak

+tests/data/add_keyframe_index.flv: TAG = GEN
+tests/data/add_keyframe_index.flv: ffmpeg$(PROGSSUF)$(EXESUF) | tests/data
+	$(M)$(TARGET_EXEC) $(TARGET_PATH)/$< \
+		-f lavfi -i "sws_flags=+accurate_rnd+bitexact;testsrc=r=7:n=2:d=20" -sws_flags '+accurate_rnd+bitexact' -metadata "encoder=Lavf" -pix_fmt yuv420p -c:v flv1 -g 7 -f flv -flags +bitexact \
+		-flvflags add_keyframe_index -idct simple -dct int -y $(TARGET_PATH)/tests/data/add_keyframe_index.flv 2> /dev/null;
+
+FATE_AFILTER-$(call ALLYES, FLV_MUXER FLV_DEMUXER AVDEVICE TESTSRC_FILTER LAVFI_INDEV FLV_ENCODER) += fate-flv-add_keyframe_index
+fate-flv-add_keyframe_index: tests/data/add_keyframe_index.flv
+fate-flv-add_keyframe_index: CMD = ffmetadata -flags +bitexact -i $(TARGET_PATH)/tests/data/add_keyframe_index.flv
+
+

tests/ref/fate/flv-add_keyframe_index

+;FFMETADATA1
+hasVideo=true
+hasKeyframes=true
+hasAudio=false
+hasMetadata=true
+canSeekToEnd=true
+datasize=629776
+videosize=629381
+audiosize=0
+lasttimestamp=20
+lastkeyframetimestamp=19
+lastkeyframelocation=597963