Add media duration to lpms_get_codec_info for GetCodecInfo (#407)

* add fps and duration to GetCodecInfo

ffmpeg/decoder.c

@@ -337,7 +337,7 @@ int open_input(input_params *params, struct input_ctx *ctx)
 
   ctx->transmuxing = params->transmuxing;
 
-  // open demuxer
+  // open demuxer/ open demuxer
   AVDictionary **demuxer_opts = NULL;
   if (params->demuxer.opts) demuxer_opts = &params->demuxer.opts;
   ret = avformat_open_input(&ic, inp, NULL, demuxer_opts);

ffmpeg/extras.c

@@ -164,6 +164,9 @@ int lpms_get_codec_info(char *fname, pcodec_info out)
     // instead of returning -1
     ret = GET_CODEC_STREAMS_MISSING;
   }
+  if (ic->duration != AV_NOPTS_VALUE) {
+    out->dur = ic->duration / AV_TIME_BASE;
+  }
   // Return
   if (video_present && vc->name) {
       strncpy(out->video_codec, vc->name, MIN(strlen(out->video_codec), strlen(vc->name))+1);
@@ -176,6 +179,7 @@ int lpms_get_codec_info(char *fname, pcodec_info out)
       }
       out->width  = ic->streams[vstream]->codecpar->width;
       out->height = ic->streams[vstream]->codecpar->height;
+      out->fps = av_q2d(ic->streams[vstream]->r_frame_rate);
   } else {
       // Indicate failure to extract video codec from given container
       out->video_codec[0] = 0;

ffmpeg/extras.h

@@ -7,6 +7,8 @@ typedef struct s_codec_info {
   int    pixel_format;
   int    width;
   int    height;
+  double fps;
+  double dur;
 } codec_info, *pcodec_info;
 
 int lpms_rtmp2hls(char *listen, char *outf, char *ts_tmpl, char *seg_time, char *seg_start);

ffmpeg/ffmpeg.go

@@ -245,6 +245,8 @@ type MediaFormatInfo struct {
 	Acodec, Vcodec string
 	PixFormat      PixelFormat
 	Width, Height  int
+	FPS            float32
+	DurSecs        int64
 }
 
 func (f *MediaFormatInfo) ScaledHeight(width int) int {
@@ -277,6 +279,8 @@ func GetCodecInfo(fname string) (CodecStatus, MediaFormatInfo, error) {
 	format.PixFormat = PixelFormat{int(params_c.pixel_format)}
 	format.Width = int(params_c.width)
 	format.Height = int(params_c.height)
+	format.FPS = float32(params_c.fps)
+	format.DurSecs = int64(params_c.dur)
 	return status, format, nil
 }
 
@@ -979,7 +983,7 @@ func (t *Transcoder) Transcode(input *TranscodeOptionsIn, ps []TranscodeOptions)
 				input.Profile.FramerateDen = 1
 			}
 
-			// Do not try tofree in this function because in the C code avformat_open_input()
+			// Do not try to free in this function because in the C code avformat_open_input()
 			// will destroy this
 			demuxerOpts.opts = newAVOpts(map[string]string{
 				"framerate": fmt.Sprintf("%d/%d", input.Profile.Framerate, input.Profile.FramerateDen),

ffmpeg/ffmpeg_test.go

@@ -1873,7 +1873,6 @@ func TestTranscoder_VFR(t *testing.T) {
 	run, dir := setupTest(t)
 	defer os.RemoveAll(dir)
 
-
 	// prepare the input by generating a vfr video and verify its properties
 	cmd := `
     ffmpeg -hide_banner -i "$1/../transcoder/test.ts" -an -vf "setpts='\
@@ -1967,3 +1966,49 @@ PTS_EOF
   `
 	run(cmd)
 }
+
+func TestDurationFPS_GetCodecInfo(t *testing.T) {
+	run, dir := setupTest(t)
+	defer os.RemoveAll(dir)
+
+	//Generate test files
+	cmd := `
+	cp "$1/../data/duplicate-audio-dts.ts" test.ts
+	ffprobe -loglevel warning -show_format test.ts | grep duration=2.008555
+	ffprobe -loglevel warning -show_streams -select_streams v test.ts | grep r_frame_rate=30/1
+	cp "$1/../data/bunny.mp4" test.mp4
+	ffmpeg -loglevel warning -i test.mp4 -c:v copy -c:a copy -t 2 test-short.mp4
+	ffprobe -loglevel warning -show_format test-short.mp4 | grep duration=2.043356
+	ffprobe -loglevel warning -show_streams -select_streams v test-short.mp4 | grep r_frame_rate=24/1
+	ffmpeg -loglevel warning -i test-short.mp4 -c:v libvpx -c:a vorbis -strict -2 -t 2 test.webm
+	ffprobe -loglevel warning -show_format test.webm | grep duration=2.049000
+	ffprobe -loglevel warning -show_streams -select_streams v test.webm | grep r_frame_rate=24/1
+	ffmpeg -loglevel warning -i test-short.mp4 -vn -c:a aac -b:a 128k test.m4a
+	ffprobe -loglevel warning -show_format test.m4a | grep duration=2.042993
+	ffmpeg -loglevel warning -i test-short.mp4 -vn -c:a flac test.flac
+	ffprobe -loglevel warning -show_format test.flac | grep duration=2.043356
+	`
+	run(cmd)
+
+	files := []struct {
+		Filename string
+		Duration int64
+		FPS      float32
+	}{
+		{Filename: "test-short.mp4", Duration: 2, FPS: 24},
+		{Filename: "test.ts", Duration: 2, FPS: 30.0},
+		{Filename: "test.flac", Duration: 2, FPS: 0.0},
+		{Filename: "test.webm", Duration: 2, FPS: 24},
+		{Filename: "test.m4a", Duration: 2, FPS: 0.0},
+	}
+	for _, file := range files {
+		t.Run(file.Filename, func(t *testing.T) {
+			assert := assert.New(t)
+			status, format, err := GetCodecInfo(path.Join(dir, file.Filename))
+			assert.Nil(err, "getcodecinfo error")
+			assert.Equal(CodecStatusOk, status, "status not ok")
+			assert.Equal(file.Duration, format.DurSecs, "duration mismatch")
+			assert.Equal(file.FPS, format.FPS, "fps mismatch")
+		})
+	}
+}