ffprobe: Support extracting the number of reference frames

Fixes Ticket3141
Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

doc/ffprobe.xsd

@@ -182,6 +182,7 @@
       <xsd:attribute name="color_primaries"      type="xsd:string"/>
       <xsd:attribute name="chroma_location"      type="xsd:string"/>
       <xsd:attribute name="timecode"             type="xsd:string"/>
+      <xsd:attribute name="refs"                 type="xsd:int"/>
 
       <!-- audio attributes -->
       <xsd:attribute name="sample_fmt"       type="xsd:string"/>

ffprobe.c

@@ -2141,6 +2141,7 @@ static int show_stream(WriterContext *w, AVFormatContext *fmt_ctx, int stream_id
             } else {
                 print_str_opt("timecode", "N/A");
             }
+            print_int("refs", dec_ctx->refs);
             break;
 
         case AVMEDIA_TYPE_AUDIO:

tests/ref/fate/ffprobe_compact

@@ -27,6 +27,6 @@ frame|media_type=video|key_frame=1|pkt_pts=6144|pkt_pts_time=0.120000|pkt_dts=61
 packet|codec_type=video|stream_index=2|pts=6144|pts_time=0.120000|dts=6144|dts_time=0.120000|duration=2048|duration_time=0.040000|convergence_duration=N/A|convergence_duration_time=N/A|size=30000|pos=1024801|flags=K
 frame|media_type=video|key_frame=1|pkt_pts=6144|pkt_pts_time=0.120000|pkt_dts=6144|pkt_dts_time=0.120000|best_effort_timestamp=6144|best_effort_timestamp_time=0.120000|pkt_duration=2048|pkt_duration_time=0.040000|pkt_pos=1024801|pkt_size=30000|width=100|height=100|pix_fmt=rgb24|sample_aspect_ratio=1:1|pict_type=I|coded_picture_number=0|display_picture_number=0|interlaced_frame=0|top_field_first=0|repeat_pict=0
 stream|index=0|codec_name=pcm_s16le|profile=unknown|codec_type=audio|codec_time_base=1/44100|codec_tag_string=PSD[16]|codec_tag=0x10445350|sample_fmt=s16|sample_rate=44100|channels=1|channel_layout=unknown|bits_per_sample=16|id=N/A|r_frame_rate=0/0|avg_frame_rate=0/0|time_base=1/44100|start_pts=0|start_time=0.000000|duration_ts=N/A|duration=N/A|bit_rate=705600|max_bit_rate=N/A|bits_per_raw_sample=N/A|nb_frames=N/A|nb_read_frames=6|nb_read_packets=6|disposition:default=0|disposition:dub=0|disposition:original=0|disposition:comment=0|disposition:lyrics=0|disposition:karaoke=0|disposition:forced=0|disposition:hearing_impaired=0|disposition:visual_impaired=0|disposition:clean_effects=0|disposition:attached_pic=0|tag:E=mc²|tag:encoder=Lavc pcm_s16le
-stream|index=1|codec_name=rawvideo|profile=unknown|codec_type=video|codec_time_base=1/51200|codec_tag_string=RGB[24]|codec_tag=0x18424752|width=320|height=240|has_b_frames=0|sample_aspect_ratio=1:1|display_aspect_ratio=4:3|pix_fmt=rgb24|level=-99|color_range=N/A|color_space=unknown|color_transfer=unknown|color_primaries=unknown|chroma_location=unspecified|timecode=N/A|id=N/A|r_frame_rate=25/1|avg_frame_rate=25/1|time_base=1/51200|start_pts=0|start_time=0.000000|duration_ts=N/A|duration=N/A|bit_rate=N/A|max_bit_rate=N/A|bits_per_raw_sample=N/A|nb_frames=N/A|nb_read_frames=4|nb_read_packets=4|disposition:default=0|disposition:dub=0|disposition:original=0|disposition:comment=0|disposition:lyrics=0|disposition:karaoke=0|disposition:forced=0|disposition:hearing_impaired=0|disposition:visual_impaired=0|disposition:clean_effects=0|disposition:attached_pic=0|tag:title=foobar|tag:duration_ts=field-and-tags-conflict-attempt|tag:encoder=Lavc rawvideo
-stream|index=2|codec_name=rawvideo|profile=unknown|codec_type=video|codec_time_base=1/51200|codec_tag_string=RGB[24]|codec_tag=0x18424752|width=100|height=100|has_b_frames=0|sample_aspect_ratio=1:1|display_aspect_ratio=1:1|pix_fmt=rgb24|level=-99|color_range=N/A|color_space=unknown|color_transfer=unknown|color_primaries=unknown|chroma_location=unspecified|timecode=N/A|id=N/A|r_frame_rate=25/1|avg_frame_rate=25/1|time_base=1/51200|start_pts=0|start_time=0.000000|duration_ts=N/A|duration=N/A|bit_rate=N/A|max_bit_rate=N/A|bits_per_raw_sample=N/A|nb_frames=N/A|nb_read_frames=4|nb_read_packets=4|disposition:default=0|disposition:dub=0|disposition:original=0|disposition:comment=0|disposition:lyrics=0|disposition:karaoke=0|disposition:forced=0|disposition:hearing_impaired=0|disposition:visual_impaired=0|disposition:clean_effects=0|disposition:attached_pic=0|tag:encoder=Lavc rawvideo
+stream|index=1|codec_name=rawvideo|profile=unknown|codec_type=video|codec_time_base=1/51200|codec_tag_string=RGB[24]|codec_tag=0x18424752|width=320|height=240|has_b_frames=0|sample_aspect_ratio=1:1|display_aspect_ratio=4:3|pix_fmt=rgb24|level=-99|color_range=N/A|color_space=unknown|color_transfer=unknown|color_primaries=unknown|chroma_location=unspecified|timecode=N/A|refs=1|id=N/A|r_frame_rate=25/1|avg_frame_rate=25/1|time_base=1/51200|start_pts=0|start_time=0.000000|duration_ts=N/A|duration=N/A|bit_rate=N/A|max_bit_rate=N/A|bits_per_raw_sample=N/A|nb_frames=N/A|nb_read_frames=4|nb_read_packets=4|disposition:default=0|disposition:dub=0|disposition:original=0|disposition:comment=0|disposition:lyrics=0|disposition:karaoke=0|disposition:forced=0|disposition:hearing_impaired=0|disposition:visual_impaired=0|disposition:clean_effects=0|disposition:attached_pic=0|tag:title=foobar|tag:duration_ts=field-and-tags-conflict-attempt|tag:encoder=Lavc rawvideo
+stream|index=2|codec_name=rawvideo|profile=unknown|codec_type=video|codec_time_base=1/51200|codec_tag_string=RGB[24]|codec_tag=0x18424752|width=100|height=100|has_b_frames=0|sample_aspect_ratio=1:1|display_aspect_ratio=1:1|pix_fmt=rgb24|level=-99|color_range=N/A|color_space=unknown|color_transfer=unknown|color_primaries=unknown|chroma_location=unspecified|timecode=N/A|refs=1|id=N/A|r_frame_rate=25/1|avg_frame_rate=25/1|time_base=1/51200|start_pts=0|start_time=0.000000|duration_ts=N/A|duration=N/A|bit_rate=N/A|max_bit_rate=N/A|bits_per_raw_sample=N/A|nb_frames=N/A|nb_read_frames=4|nb_read_packets=4|disposition:default=0|disposition:dub=0|disposition:original=0|disposition:comment=0|disposition:lyrics=0|disposition:karaoke=0|disposition:forced=0|disposition:hearing_impaired=0|disposition:visual_impaired=0|disposition:clean_effects=0|disposition:attached_pic=0|tag:encoder=Lavc rawvideo
 format|filename=tests/data/ffprobe-test.nut|nb_streams=3|nb_programs=0|format_name=nut|start_time=0.000000|duration=0.120000|size=1054882|bit_rate=70325466|probe_score=100|tag:title=ffprobe test file|tag:comment='A comment with CSV, XML & JSON special chars': <tag value="x">|tag:comment2=I ♥ Üñîçød€

tests/ref/fate/ffprobe_csv

@@ -27,6 +27,6 @@ frame,video,1,6144,0.120000,6144,0.120000,6144,0.120000,2048,0.040000,794377,230
 packet,video,2,6144,0.120000,6144,0.120000,2048,0.040000,N/A,N/A,30000,1024801,K
 frame,video,1,6144,0.120000,6144,0.120000,6144,0.120000,2048,0.040000,1024801,30000,100,100,rgb24,1:1,I,0,0,0,0,0
 stream,0,pcm_s16le,unknown,audio,1/44100,PSD[16],0x10445350,s16,44100,1,unknown,16,N/A,0/0,0/0,1/44100,0,0.000000,N/A,N/A,705600,N/A,N/A,N/A,6,6,0,0,0,0,0,0,0,0,0,0,0,mc²,Lavc pcm_s16le
-stream,1,rawvideo,unknown,video,1/51200,RGB[24],0x18424752,320,240,0,1:1,4:3,rgb24,-99,N/A,unknown,unknown,unknown,unspecified,N/A,N/A,25/1,25/1,1/51200,0,0.000000,N/A,N/A,N/A,N/A,N/A,N/A,4,4,0,0,0,0,0,0,0,0,0,0,0,foobar,field-and-tags-conflict-attempt,Lavc rawvideo
-stream,2,rawvideo,unknown,video,1/51200,RGB[24],0x18424752,100,100,0,1:1,1:1,rgb24,-99,N/A,unknown,unknown,unknown,unspecified,N/A,N/A,25/1,25/1,1/51200,0,0.000000,N/A,N/A,N/A,N/A,N/A,N/A,4,4,0,0,0,0,0,0,0,0,0,0,0,Lavc rawvideo
+stream,1,rawvideo,unknown,video,1/51200,RGB[24],0x18424752,320,240,0,1:1,4:3,rgb24,-99,N/A,unknown,unknown,unknown,unspecified,N/A,1,N/A,25/1,25/1,1/51200,0,0.000000,N/A,N/A,N/A,N/A,N/A,N/A,4,4,0,0,0,0,0,0,0,0,0,0,0,foobar,field-and-tags-conflict-attempt,Lavc rawvideo
+stream,2,rawvideo,unknown,video,1/51200,RGB[24],0x18424752,100,100,0,1:1,1:1,rgb24,-99,N/A,unknown,unknown,unknown,unspecified,N/A,1,N/A,25/1,25/1,1/51200,0,0.000000,N/A,N/A,N/A,N/A,N/A,N/A,4,4,0,0,0,0,0,0,0,0,0,0,0,Lavc rawvideo
 format,tests/data/ffprobe-test.nut,3,0,nut,0.000000,0.120000,1054882,70325466,100,ffprobe test file,"'A comment with CSV, XML & JSON special chars': <tag value=""x"">",I ♥ Üñîçød€

tests/ref/fate/ffprobe_default

@@ -570,6 +570,7 @@ color_transfer=unknown
 color_primaries=unknown
 chroma_location=unspecified
 timecode=N/A
+refs=1
 id=N/A
 r_frame_rate=25/1
 avg_frame_rate=25/1
@@ -620,6 +621,7 @@ color_transfer=unknown
 color_primaries=unknown
 chroma_location=unspecified
 timecode=N/A
+refs=1
 id=N/A
 r_frame_rate=25/1
 avg_frame_rate=25/1

tests/ref/fate/ffprobe_flat

@@ -511,6 +511,7 @@ streams.stream.1.color_transfer="unknown"
 streams.stream.1.color_primaries="unknown"
 streams.stream.1.chroma_location="unspecified"
 streams.stream.1.timecode="N/A"
+streams.stream.1.refs=1
 streams.stream.1.id="N/A"
 streams.stream.1.r_frame_rate="25/1"
 streams.stream.1.avg_frame_rate="25/1"
@@ -559,6 +560,7 @@ streams.stream.2.color_transfer="unknown"
 streams.stream.2.color_primaries="unknown"
 streams.stream.2.chroma_location="unspecified"
 streams.stream.2.timecode="N/A"
+streams.stream.2.refs=1
 streams.stream.2.id="N/A"
 streams.stream.2.r_frame_rate="25/1"
 streams.stream.2.avg_frame_rate="25/1"

tests/ref/fate/ffprobe_ini

@@ -576,6 +576,7 @@ color_transfer=unknown
 color_primaries=unknown
 chroma_location=unspecified
 timecode=N/A
+refs=1
 id=N/A
 r_frame_rate=25/1
 avg_frame_rate=25/1
@@ -630,6 +631,7 @@ color_transfer=unknown
 color_primaries=unknown
 chroma_location=unspecified
 timecode=N/A
+refs=1
 id=N/A
 r_frame_rate=25/1
 avg_frame_rate=25/1

tests/ref/fate/ffprobe_json

@@ -557,6 +557,7 @@
             "display_aspect_ratio": "4:3",
             "pix_fmt": "rgb24",
             "level": -99,
+            "refs": 1,
             "r_frame_rate": "25/1",
             "avg_frame_rate": "25/1",
             "time_base": "1/51200",
@@ -597,6 +598,7 @@
             "display_aspect_ratio": "1:1",
             "pix_fmt": "rgb24",
             "level": -99,
+            "refs": 1,
             "r_frame_rate": "25/1",
             "avg_frame_rate": "25/1",
             "time_base": "1/51200",

tests/ref/fate/ffprobe_xml

@@ -37,13 +37,13 @@
             <tag key="E" value="mc²"/>
             <tag key="encoder" value="Lavc pcm_s16le"/>
         </stream>
-        <stream index="1" codec_name="rawvideo" codec_type="video" codec_time_base="1/51200" codec_tag_string="RGB[24]" codec_tag="0x18424752" width="320" height="240" has_b_frames="0" sample_aspect_ratio="1:1" display_aspect_ratio="4:3" pix_fmt="rgb24" level="-99" r_frame_rate="25/1" avg_frame_rate="25/1" time_base="1/51200" start_pts="0" start_time="0.000000" nb_read_frames="4" nb_read_packets="4">
+        <stream index="1" codec_name="rawvideo" codec_type="video" codec_time_base="1/51200" codec_tag_string="RGB[24]" codec_tag="0x18424752" width="320" height="240" has_b_frames="0" sample_aspect_ratio="1:1" display_aspect_ratio="4:3" pix_fmt="rgb24" level="-99" refs="1" r_frame_rate="25/1" avg_frame_rate="25/1" time_base="1/51200" start_pts="0" start_time="0.000000" nb_read_frames="4" nb_read_packets="4">
             <disposition default="0" dub="0" original="0" comment="0" lyrics="0" karaoke="0" forced="0" hearing_impaired="0" visual_impaired="0" clean_effects="0" attached_pic="0"/>
             <tag key="title" value="foobar"/>
             <tag key="duration_ts" value="field-and-tags-conflict-attempt"/>
             <tag key="encoder" value="Lavc rawvideo"/>
         </stream>
-        <stream index="2" codec_name="rawvideo" codec_type="video" codec_time_base="1/51200" codec_tag_string="RGB[24]" codec_tag="0x18424752" width="100" height="100" has_b_frames="0" sample_aspect_ratio="1:1" display_aspect_ratio="1:1" pix_fmt="rgb24" level="-99" r_frame_rate="25/1" avg_frame_rate="25/1" time_base="1/51200" start_pts="0" start_time="0.000000" nb_read_frames="4" nb_read_packets="4">
+        <stream index="2" codec_name="rawvideo" codec_type="video" codec_time_base="1/51200" codec_tag_string="RGB[24]" codec_tag="0x18424752" width="100" height="100" has_b_frames="0" sample_aspect_ratio="1:1" display_aspect_ratio="1:1" pix_fmt="rgb24" level="-99" refs="1" r_frame_rate="25/1" avg_frame_rate="25/1" time_base="1/51200" start_pts="0" start_time="0.000000" nb_read_frames="4" nb_read_packets="4">
             <disposition default="0" dub="0" original="0" comment="0" lyrics="0" karaoke="0" forced="0" hearing_impaired="0" visual_impaired="0" clean_effects="0" attached_pic="0"/>
             <tag key="encoder" value="Lavc rawvideo"/>
         </stream>