Patch-Source: https://github.com/archlinux/svntogit-packages/blob/62e92f1f1c87d766797ffcfc140c3c9b3a0c0694/trunk/ffmpeg5.patch
From 6d938d70b1d52634f8b0d88cb29da87f8d5b35a2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bernhard=20Rosenkr=C3=A4nzer?= <bero@lindev.ch>
Date: Mon, 17 Jan 2022 04:41:33 +0100
Subject: [PATCH] Port to ffmpeg 5.0
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Replace removed functionality like accessing the codec context
from an AVStream and avcodec_decode_audio4()

Signed-off-by: Bernhard Rosenkränzer <bero@lindev.ch>
---
 src/audio/ffmpeg_audio_reader.h | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/src/audio/ffmpeg_audio_reader.h b/src/audio/ffmpeg_audio_reader.h
index 5550164..a3b8de7 100644
--- a/src/audio/ffmpeg_audio_reader.h
+++ b/src/audio/ffmpeg_audio_reader.h
@@ -74,7 +74,7 @@ class FFmpegAudioReader {
 	uint8_t *m_convert_buffer[1] = { nullptr };
 	int m_convert_buffer_nb_samples = 0;

-	AVInputFormat *m_input_fmt = nullptr;
+	const AVInputFormat *m_input_fmt = nullptr;
 	AVDictionary *m_input_opts = nullptr;

 	AVFormatContext *m_format_ctx = nullptr;
@@ -153,7 +153,7 @@ inline bool FFmpegAudioReader::Open(const std::string &file_name) {
 		return false;
 	}

-	AVCodec *codec;
+	const AVCodec *codec;
 	ret = av_find_best_stream(m_format_ctx, AVMEDIA_TYPE_AUDIO, -1, -1, &codec, 0);
 	if (ret < 0) {
 		SetError("Could not find any audio stream in the file", ret);
@@ -161,7 +161,13 @@ inline bool FFmpegAudioReader::Open(const std::string &file_name) {
 	}
 	m_stream_index = ret;

+#if LIBAVCODEC_VERSION_MAJOR >= 59
+	const AVCodec *streamcodec = avcodec_find_decoder(m_format_ctx->streams[m_stream_index]->codecpar->codec_id);
+	m_codec_ctx = avcodec_alloc_context3(streamcodec);
+	avcodec_parameters_to_context(m_codec_ctx, m_format_ctx->streams[m_stream_index]->codecpar);
+#else
 	m_codec_ctx = m_format_ctx->streams[m_stream_index]->codec;
+#endif
 	m_codec_ctx->request_sample_fmt = AV_SAMPLE_FMT_S16;

 	ret = avcodec_open2(m_codec_ctx, codec, nullptr);
@@ -278,7 +284,23 @@ inline bool FFmpegAudioReader::Read(const int16_t **data, size_t *size) {
 			}
 		}

+#if LIBAVCODEC_VERSION_MAJOR < 59
 		ret = avcodec_decode_audio4(m_codec_ctx, m_frame, &m_got_frame, &m_packet);
+#else
+		m_got_frame = 0;
+		ret = avcodec_send_packet(m_codec_ctx, &m_packet);
+		if(ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+			ret = 0;
+		if(ret >= 0) {
+			ret = avcodec_receive_frame(m_codec_ctx, m_frame);
+			if (ret == 0) {
+				m_got_frame = 1;
+				ret = m_packet.size;
+			}
+		}
+		if(ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+			ret = 0;
+#endif
 		if (ret < 0) {
 			if (m_decode_error) {
 				SetError("Error decoding audio frame", m_decode_error);
