X-Git-Url: https://git.carlh.net/gitweb/?a=blobdiff_plain;f=src%2Flib%2Fffmpeg_examiner.cc;h=fdcacb465602693fba0bf668cc82d7bd9b82ddd6;hb=ff639b3cf30afcc097bfd21d39c8d15f466cadd6;hp=382b71b83442a36e2fe4910310131190fbfcb84f;hpb=c4403784febdbdd42e9c32e67fadb147f11fe566;p=dcpomatic.git

diff --git a/src/lib/ffmpeg_examiner.cc b/src/lib/ffmpeg_examiner.cc
index 382b71b83..fdcacb465 100644
--- a/src/lib/ffmpeg_examiner.cc
+++ b/src/lib/ffmpeg_examiner.cc
@@ -1,5 +1,5 @@
 /*
-    Copyright (C) 2013-2015 Carl Hetherington <cth@carlh.net>
+    Copyright (C) 2013-2021 Carl Hetherington <cth@carlh.net>
 
     This file is part of DCP-o-matic.
 
@@ -18,71 +18,85 @@
 
 */
 
+
+#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 <dcp/warnings.h>
+LIBDCP_DISABLE_WARNINGS
 extern "C" {
 #include <libavcodec/avcodec.h>
 #include <libavformat/avformat.h>
 #include <libavutil/pixfmt.h>
 #include <libavutil/pixdesc.h>
-#include <libavutil/eval.h>
+#include <libavutil/channel_layout.h>
 #include <libavutil/display.h>
+#include <libavutil/eval.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>
+LIBDCP_ENABLE_WARNINGS
 #include <iostream>
 
 #include "i18n.h"
 
-using std::string;
+
 using std::cout;
+using std::make_shared;
 using std::max;
-using boost::shared_ptr;
+using std::shared_ptr;
+using std::string;
+using std::vector;
 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];
-		if (s->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
+		auto s = _format_context->streams[i];
+		auto codec = _codec_context[i] ? _codec_context[i]->codec : nullptr;
+		if (s->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && codec) {
 
 			/* This is a hack; sometimes it seems that _audio_codec_context->channel_layout isn't set up,
 			   so bodge it here.  No idea why we should have to do this.
 			*/
 
-			if (s->codec->channel_layout == 0) {
-				s->codec->channel_layout = av_get_default_channel_layout (s->codec->channels);
+			if (s->codecpar->channel_layout == 0) {
+				s->codecpar->channel_layout = av_get_default_channel_layout (s->codecpar->channels);
 			}
 
 			DCPOMATIC_ASSERT (_format_context->duration != AV_NOPTS_VALUE);
-			DCPOMATIC_ASSERT (s->codec->codec);
-			DCPOMATIC_ASSERT (s->codec->codec->name);
+			DCPOMATIC_ASSERT (codec->name);
 
 			_audio_streams.push_back (
-				shared_ptr<FFmpegAudioStream> (
-					new FFmpegAudioStream (
-						stream_name (s),
-						s->codec->codec->name,
-						s->id,
-						s->codec->sample_rate,
-						llrint ((double (_format_context->duration) / AV_TIME_BASE) * s->codec->sample_rate),
-						s->codec->channels
-						)
+				make_shared<FFmpegAudioStream>(
+					stream_name (s),
+					codec->name,
+					s->id,
+					s->codecpar->sample_rate,
+					llrint ((double(_format_context->duration) / AV_TIME_BASE) * s->codecpar->sample_rate),
+					s->codecpar->channels
 					)
 				);
 
-		} else if (s->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
-			_subtitle_streams.push_back (shared_ptr<FFmpegSubtitleStream> (new FFmpegSubtitleStream (subtitle_stream_name (s), s->id)));
+		} else if (s->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE) {
+			_subtitle_streams.push_back (make_shared<FFmpegSubtitleStream>(subtitle_stream_name (s), s->id));
 		}
 	}
 
@@ -101,12 +115,21 @@ 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);
+		auto packet = av_packet_alloc ();
+		DCPOMATIC_ASSERT (packet);
+		int r = av_read_frame (_format_context, packet);
 		if (r < 0) {
+			av_packet_free (&packet);
 			break;
 		}
 
@@ -118,35 +141,45 @@ FFmpegExaminer::FFmpegExaminer (shared_ptr<const FFmpegContent> c, shared_ptr<Jo
 			}
 		}
 
-		AVCodecContext* context = _format_context->streams[_packet.stream_index]->codec;
+		auto context = _codec_context[packet->stream_index];
 
-		if (_video_stream && _packet.stream_index == _video_stream.get()) {
-			video_packet (context);
+		if (_video_stream && packet->stream_index == _video_stream.get()) {
+			video_packet (context, temporal_reference, packet);
 		}
 
 		bool got_all_audio = true;
 
 		for (size_t i = 0; i < _audio_streams.size(); ++i) {
-			if (_audio_streams[i]->uses_index (_format_context, _packet.stream_index)) {
-				audio_packet (context, _audio_streams[i]);
+			if (_audio_streams[i]->uses_index(_format_context, packet->stream_index)) {
+				audio_packet (context, _audio_streams[i], packet);
 			}
 			if (!_audio_streams[i]->first_audio) {
 				got_all_audio = false;
 			}
 		}
 
-		av_packet_unref (&_packet);
+		av_packet_free (&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) {
+		auto context = _codec_context[_video_stream.get()];
+		while (video_packet(context, temporal_reference, nullptr)) {}
+	}
+
+	for (auto i: _audio_streams) {
+		auto context = _codec_context[i->index(_format_context)];
+		audio_packet(context, i, nullptr);
+	}
+
 	if (_video_stream) {
 		/* This code taken from get_rotation() in ffmpeg:cmdutils.c */
-		AVStream* stream = _format_context->streams[*_video_stream];
-		AVDictionaryEntry* rotate_tag = av_dict_get (stream->metadata, "rotate", 0, 0);
+		auto stream = _format_context->streams[*_video_stream];
+		auto rotate_tag = av_dict_get (stream->metadata, "rotate", 0, 0);
 		uint8_t* displaymatrix = av_stream_get_side_data (stream, AV_PKT_DATA_DISPLAYMATRIX, 0);
 		_rotation = 0;
 
@@ -163,59 +196,106 @@ 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)");
 	}
 }
 
-void
-FFmpegExaminer::video_packet (AVCodecContext* context)
+
+/** @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,
+ *  the second  is 3 or 2 depending on whether "repeat_pict" is true or not.
+ *  @return true if some video was decoded, otherwise false.
+ */
+bool
+FFmpegExaminer::video_packet (AVCodecContext* context, string& temporal_reference, AVPacket* packet)
 {
 	DCPOMATIC_ASSERT (_video_stream);
 
-	if (_first_video && !_need_video_length) {
-		return;
+	if (_first_video && !_need_video_length && temporal_reference.size() >= (PULLDOWN_CHECK_FRAMES * 2)) {
+		return false;
 	}
 
-	int frame_finished;
-	if (avcodec_decode_video2 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
-		if (!_first_video) {
-			_first_video = frame_time (_format_context->streams[_video_stream.get()]);
+	bool pending = false;
+	do {
+		int r = avcodec_send_packet (context, packet);
+		if (r < 0) {
+			LOG_WARNING("avcodec_send_packet returned %1 for a video packet", r);
 		}
-		if (_need_video_length) {
-			_video_length = frame_time (
-				_format_context->streams[_video_stream.get()]
-				).get_value_or (ContentTime ()).frames_round (video_frame_rate().get ());
+
+		/* EAGAIN means we should call avcodec_receive_frame and then re-send the same packet */
+		pending = r == AVERROR(EAGAIN);
+
+		r = avcodec_receive_frame (context, _video_frame);
+		if (r == AVERROR(EAGAIN)) {
+			/* More input is required */
+			return true;
+		} else if (r == AVERROR_EOF) {
+			/* No more output is coming */
+			return false;
 		}
+	} while (pending);
+
+	if (!_first_video) {
+		_first_video = frame_time (_video_frame, _format_context->streams[_video_stream.get()]);
+	}
+	if (_need_video_length) {
+		_video_length = frame_time (
+			_video_frame,
+			_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 += (_video_frame->top_field_first ? "T" : "B");
+		temporal_reference += (_video_frame->repeat_pict ? "3" : "2");
 	}
+
+	return true;
 }
 
+
 void
-FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream)
+FFmpegExaminer::audio_packet (AVCodecContext* context, shared_ptr<FFmpegAudioStream> stream, AVPacket* packet)
 {
 	if (stream->first_audio) {
 		return;
 	}
 
-	int frame_finished;
-	if (avcodec_decode_audio4 (context, _frame, &frame_finished, &_packet) >= 0 && frame_finished) {
-		stream->first_audio = frame_time (stream->stream (_format_context));
+	int r = avcodec_send_packet (context, packet);
+	if (r < 0) {
+		LOG_WARNING("avcodec_send_packet returned %1 for an audio packet", r);
+		return;
 	}
+
+	auto frame = audio_frame (stream);
+
+	if (avcodec_receive_frame (context, frame) < 0) {
+		return;
+	}
+
+	stream->first_audio = frame_time (frame, stream->stream(_format_context));
 }
 
+
 optional<ContentTime>
-FFmpegExaminer::frame_time (AVStream* s) const
+FFmpegExaminer::frame_time (AVFrame* frame, AVStream* stream) const
 {
 	optional<ContentTime> t;
 
-	int64_t const bet = av_frame_get_best_effort_timestamp (_frame);
+	int64_t const bet = frame->best_effort_timestamp;
 	if (bet != AV_NOPTS_VALUE) {
-		t = ContentTime::from_seconds (bet * av_q2d (s->time_base));
+		t = ContentTime::from_seconds (bet * av_q2d(stream->time_base));
 	}
 
 	return t;
 }
 
+
 optional<double>
 FFmpegExaminer::video_frame_rate () const
 {
@@ -223,12 +303,14 @@ FFmpegExaminer::video_frame_rate () const
 	return av_q2d(av_guess_frame_rate(_format_context, _format_context->streams[_video_stream.get()], 0));
 }
 
+
 dcp::Size
 FFmpegExaminer::video_size () const
 {
 	return dcp::Size (video_codec_context()->width, video_codec_context()->height);
 }
 
+
 /** @return Length according to our content's header */
 Frame
 FFmpegExaminer::video_length () const
@@ -236,22 +318,24 @@ FFmpegExaminer::video_length () const
 	return max (Frame (1), _video_length);
 }
 
+
 optional<double>
 FFmpegExaminer::sample_aspect_ratio () const
 {
 	DCPOMATIC_ASSERT (_video_stream);
-	AVRational sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream.get()], 0);
+	auto sar = av_guess_sample_aspect_ratio (_format_context, _format_context->streams[_video_stream.get()], 0);
 	if (sar.num == 0) {
 		/* I assume this means that we don't know */
-		return optional<double> ();
+		return {};
 	}
 	return double (sar.num) / sar.den;
 }
 
+
 string
 FFmpegExaminer::subtitle_stream_name (AVStream* s) const
 {
-	string n = stream_name (s);
+	auto n = stream_name (s);
 
 	if (n.empty()) {
 		n = _("unknown");
@@ -260,18 +344,19 @@ FFmpegExaminer::subtitle_stream_name (AVStream* s) const
 	return n;
 }
 
+
 string
 FFmpegExaminer::stream_name (AVStream* s) const
 {
 	string n;
 
 	if (s->metadata) {
-		AVDictionaryEntry const * lang = av_dict_get (s->metadata, "language", 0, 0);
+		auto const lang = av_dict_get (s->metadata, "language", 0, 0);
 		if (lang) {
 			n = lang->value;
 		}
 
-		AVDictionaryEntry const * title = av_dict_get (s->metadata, "title", 0, 0);
+		auto const title = av_dict_get (s->metadata, "title", 0, 0);
 		if (title) {
 			if (!n.empty()) {
 				n += " ";
@@ -283,18 +368,20 @@ FFmpegExaminer::stream_name (AVStream* s) const
 	return n;
 }
 
+
 optional<int>
 FFmpegExaminer::bits_per_pixel () const
 {
 	if (video_codec_context()->pix_fmt == -1) {
-		return optional<int>();
+		return {};
 	}
 
-	AVPixFmtDescriptor const * d = av_pix_fmt_desc_get (video_codec_context()->pix_fmt);
+	auto const d = av_pix_fmt_desc_get (video_codec_context()->pix_fmt);
 	DCPOMATIC_ASSERT (d);
 	return av_get_bits_per_pixel (d);
 }
 
+
 bool
 FFmpegExaminer::yuv () const
 {
@@ -376,8 +463,33 @@ FFmpegExaminer::yuv () const
 	}
 }
 
+
 bool
 FFmpegExaminer::has_video () const
 {
-	return static_cast<bool> (_video_stream);
+	return static_cast<bool>(_video_stream);
 }
+
+
+VideoRange
+FFmpegExaminer::range () const
+{
+	switch (color_range()) {
+	case AVCOL_RANGE_MPEG:
+	case AVCOL_RANGE_UNSPECIFIED:
+		return VideoRange::VIDEO;
+	case AVCOL_RANGE_JPEG:
+	default:
+		return VideoRange::FULL;
+	}
+}
+
+
+PixelQuanta
+FFmpegExaminer::pixel_quanta () const
+{
+	auto const desc = av_pix_fmt_desc_get(video_codec_context()->pix_fmt);
+	DCPOMATIC_ASSERT (desc);
+	return { 1 << desc->log2_chroma_w, 1 << desc->log2_chroma_h };
+}
+