X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fffmpeg_examiner.cc;h=23c2f1a72609189a010ba041f9e02f292f96b9c3;hb=a5d004b0773f633401528392fc28e66d70e13ac8;hp=4205d3d23532c676aaea5873af3c60790fee98cf;hpb=383c3b6c81e916c59b08a765540784d3f2350276;p=dcpomatic.git

diff --git a/src/lib/ffmpeg_examiner.cc b/src/lib/ffmpeg_examiner.cc
index 4205d3d23..23c2f1a72 100644
--- a/src/lib/ffmpeg_examiner.cc
+++ b/src/lib/ffmpeg_examiner.cc
@@ -18,6 +18,15 @@
 
 */
 
+#include "dcpomatic_log.h"
+#include "ffmpeg_examiner.h"
+#include "ffmpeg_content.h"
+#include "job.h"
+#include "ffmpeg_audio_stream.h"
+#include "ffmpeg_subtitle_stream.h"
+#include "util.h"
+#include "warnings.h"
+DCPOMATIC_DISABLE_WARNINGS
 extern "C" {
 #include <libavcodec/avcodec.h>
 #include <libavformat/avformat.h>
@@ -26,13 +35,7 @@ extern "C" {
 #include <libavutil/eval.h>
 #include <libavutil/display.h>
 }
-#include "ffmpeg_examiner.h"
-#include "ffmpeg_content.h"
-#include "job.h"
-#include "ffmpeg_audio_stream.h"
-#include "ffmpeg_subtitle_stream.h"
-#include "util.h"
-#include <boost/foreach.hpp>
+DCPOMATIC_ENABLE_WARNINGS
 #include <iostream>
 
 #include "i18n.h"
@@ -40,19 +43,30 @@ extern "C" {
 using std::string;
 using std::cout;
 using std::max;
-using boost::shared_ptr;
+using std::vector;
+using std::shared_ptr;
 using boost::optional;
+using namespace dcpomatic;
+
+
+/* This is how many frames from the start of any video that we will examine to see if we
+ * can spot soft 2:3 pull-down ("telecine").
+ */
+static const int PULLDOWN_CHECK_FRAMES = 16;
+
 
 /** @param job job that the examiner is operating in, or 0 */
 FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Job> job)
 	: FFmpeg (c)
 	, _video_length (0)
 	, _need_video_length (false)
+	, _pulldown (false)
 {
 	/* Find audio and subtitle streams */
 
 	for (uint32_t i = 0; i < _format_context->nb_streams; ++i) {
 		AVStream* s = _format_context->streams[i];
+DCPOMATIC_DISABLE_WARNINGS
 		if (s->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
 
 			/* This is a hack; sometimes it seems that _audio_codec_context->channel_layout isn't set up,
@@ -100,9 +114,15 @@ FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Jo
 	/* Run through until we find:
 	 *   - the first video.
 	 *   - the first audio for each stream.
+	 *   - the top-field-first and repeat-first-frame values ("temporal_reference") for the first PULLDOWN_CHECK_FRAMES video frames.
 	 */
 
 	int64_t const len = _file_group.length ();
+	/* A string which we build up to describe the top-field-first and repeat-first-frame values for the first few frames.
+	 * It would be nicer to use something like vector<bool> here but we want to search the array for a pattern later,
+	 * and a string seems a reasonably neat way to do that.
+	 */
+	string temporal_reference;
 	while (true) {
 		int r = av_read_frame (_format_context, &_packet);
 		if (r < 0) {
@@ -118,9 +138,10 @@ FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Jo
 		}
 
 		AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
+DCPOMATIC_ENABLE_WARNINGS
 
 		if (_video_stream && _packet.stream_index == _video_stream.get()) {
-			video_packet (context);
+			video_packet (context, temporal_reference);
 		}
 
 		bool got_all_audio = true;
@@ -136,13 +157,12 @@ FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Jo
 
 		av_packet_unref (&_packet);
 
-		if (_first_video && got_all_audio) {
+		if (_first_video && got_all_audio && temporal_reference.size() >= (PULLDOWN_CHECK_FRAMES * 2)) {
 			/* All done */
 			break;
 		}
 	}
 
-
 	if (_video_stream) {
 		/* This code taken from get_rotation() in ffmpeg:cmdutils.c */
 		AVStream* stream = _format_context->streams[*_video_stream];
@@ -163,22 +183,34 @@ FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Jo
 		}
 
 		_rotation = *_rotation - 360 * floor (*_rotation / 360 + 0.9 / 360);
+	}
 
-		DCPOMATIC_ASSERT (fabs (*_rotation - 90 * round (*_rotation / 90)) < 2);
+	LOG_GENERAL("Temporal reference was %1", temporal_reference);
+	if (temporal_reference.find("T2T3B2B3T2T3B2B3") != string::npos || temporal_reference.find("B2B3T2T3B2B3T2T3") != string::npos) {
+		/* The magical sequence (taken from mediainfo) suggests that 2:3 pull-down is in use */
+		_pulldown = true;
+		LOG_GENERAL_NC("Suggest that this may be 2:3 pull-down (soft telecine)");
 	}
 }
 
+
+/** @param temporal_reference A string to which we should add two characters per frame;
+ *  the first   is T or B depending on whether it's top- or bottom-field first,
+ *  ths seconds is 3 or 2 depending on whether "repeat_pict" is true or not.
+ */
 void
-FFmpegExaminer::video_packet (AVCodecContext* context)
+FFmpegExaminer::video_packet (AVCodecContext* context, string& temporal_reference)
 {
 	DCPOMATIC_ASSERT (_video_stream);
 
-	if (_first_video && !_need_video_length) {
+	if (_first_video && !_need_video_length && temporal_reference.size() >= (PULLDOWN_CHECK_FRAMES * 2)) {
 		return;
 	}
 
 	int frame_finished;
+DCPOMATIC_DISABLE_WARNINGS
 	if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
+DCPOMATIC_ENABLE_WARNINGS
 		if (!_first_video) {
 			_first_video = frame_time (_format_context->streams[_video_stream.get()]);
 		}
@@ -187,9 +219,14 @@ FFmpegExaminer::video_packet (AVCodecContext* context)
 				_format_context->streams[_video_stream.get()]
 				).get_value_or (ContentTime ()).frames_round (video_frame_rate().get ());
 		}
+		if (temporal_reference.size() < (PULLDOWN_CHECK_FRAMES * 2)) {
+			temporal_reference += (_frame->top_field_first ? "T" : "B");
+			temporal_reference += (_frame->repeat_pict ? "3" : "2");
+		}
 	}
 }
 
+
 void
 FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream)
 {
@@ -198,17 +235,22 @@ FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStr
 	}
 
 	int frame_finished;
+DCPOMATIC_DISABLE_WARNINGS
 	if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
+DCPOMATIC_ENABLE_WARNINGS
 		stream->first_audio = frame_time (stream->stream (_format_context));
 	}
 }
 
+
 optional<ContentTime>
 FFmpegExaminer::frame_time (AVStream* s) const
 {
 	optional<ContentTime> t;
 
+DCPOMATIC_DISABLE_WARNINGS
 	int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
+DCPOMATIC_ENABLE_WARNINGS
 	if (bet != AV_NOPTS_VALUE) {
 		t = ContentTime::from_seconds (bet * av_q2d (s->time_base));
 	}
@@ -216,6 +258,7 @@ FFmpegExaminer::frame_time (AVStream* s) const
 	return t;
 }
 
+
 optional<double>
 FFmpegExaminer::video_frame_rate () const
 {
@@ -381,3 +424,16 @@ FFmpegExaminer::has_video () const
 {
 	return static_cast<bool> (_video_stream);
 }
+
+VideoRange
+FFmpegExaminer::range () const
+{
+	switch (color_range()) {
+	case AVCOL_RANGE_MPEG:
+	case AVCOL_RANGE_UNSPECIFIED:
+		return VIDEO_RANGE_VIDEO;
+	case AVCOL_RANGE_JPEG:
+	default:
+		return VIDEO_RANGE_FULL;
+	}
+}