Implement ffmpeg 5.0 support

Version 5.0 of ffmpeg removed a lot of deprecated API which causes akode
to fail to build against it. The ffmpeg plugin has been amended to allow
akode to build against the new version as well as older versions, plus a
call to "av_register_all" has been re-instated for earlier versions to
ensure the player functions correctly.

Signed-off-by: aneejit1 <aneejit1@gmail.com>

1 files changed, 100 insertions, 34 deletions

diff --git a/akode/plugins/ffmpeg_decoder/ffmpeg_decoder.cpp b/akode/plugins/ffmpeg_decoder/ffmpeg_decoder.cpp
index 4d347c4..25d9297 100644
--- a/akode/plugins/ffmpeg_decoder/ffmpeg_decoder.cpp
+++ b/akode/plugins/ffmpeg_decoder/ffmpeg_decoder.cpp
@@ -37,7 +37,7 @@ extern "C" {
 #include "ffmpeg_decoder.h"
 #include <iostream>
 
-#if LIBAVCODEC_VERSION_MAJOR < 58
+#if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(57, 33, 100)
 #define CODECPAR codec
 #else
 #define CODECPAR codecpar
@@ -69,10 +69,6 @@ bool FFMPEGDecoderPlugin::canDecode(File* /*src*/) {
     // ### FIXME
     return true;
 }
-/*
-void FFMPEGDecoderPlugin::initializeFFMPEG() {
-    av_register_all();
-}*/
 
 extern "C" { FFMPEGDecoderPlugin ffmpeg_decoder; }
 
@@ -81,7 +77,8 @@ extern "C" { FFMPEGDecoderPlugin ffmpeg_decoder; }
 struct FFMPEGDecoder::private_data
 {
     private_data() : audioStream(-1), videoStream(-1), packetSize(0), position(0),
-                     eof(false), error(false), initialized(false), retries(0) {};
+                     eof(false), error(false), initialized(false), retries(0),
+                     packet(NULL), audioStream_ctx(NULL), videoStream_ctx(NULL) {};
 
     AVFormatContext* ic;
     AVCodec* codec;
@@ -90,8 +87,13 @@ struct FFMPEGDecoder::private_data
 
     int audioStream;
     int videoStream;
+    AVCodecContext *audioStream_ctx;
+    AVCodecContext *videoStream_ctx;
 
-    AVPacket packet;
+    AVPacket *packet;
+#if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(57, 12, 100)
+    AVPacket _packet;
+#endif
     uint8_t* packetData;
     int packetSize;
 
@@ -113,6 +115,9 @@ FFMPEGDecoder::FFMPEGDecoder(File *src) {
     d = new private_data;
 
     d->src = src;
+#if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(58,9,100)
+    av_register_all();
+#endif
 }
 
 FFMPEGDecoder::~FFMPEGDecoder() {
@@ -206,20 +211,41 @@ bool FFMPEGDecoder::openFile() {
 
     av_dump_format(d->ic, d->audioStream, d->src->filename, 0);
 
-    // Set config
-    if (!setAudioConfiguration(&d->config, d->ic->streams[d->audioStream]->codec))
-    {
+    d->codec = (AVCodec *)avcodec_find_decoder(d->ic->streams[d->audioStream]->CODECPAR->codec_id);
+    if (!d->codec) {
+        std::cerr << "akode: FFMPEG: Codec not found\n";
         closeFile();
         return false;
     }
 
-    d->codec = avcodec_find_decoder(d->ic->streams[d->audioStream]->CODECPAR->codec_id);
-    if (!d->codec) {
-        std::cerr << "akode: FFMPEG: Codec not found\n";
+#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 33, 100)
+    // allocate a codec context
+    d->audioStream_ctx = avcodec_alloc_context3(d->codec);
+    if (d->audioStream_ctx) {
+        avcodec_parameters_to_context(d->audioStream_ctx, d->ic->streams[d->audioStream]->codecpar);
+    }
+    else {
+        std::cerr << "akode: failed to allocate an audio codec context\n";
+        closeFile();
+        return false;
+    }
+#else
+    d->audioStream_ctx = d->ic->streams[d->audioStream]->codec;
+#endif
+
+    // Set config
+    if (!setAudioConfiguration(&d->config, d->audioStream_ctx))
+    {
         closeFile();
+#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 33, 100)
+        avcodec_free_context(&d->audioStream_ctx);
+#else
+        d->audioStream_ctx = NULL;
+#endif
         return false;
     }
-    avcodec_open2( d->ic->streams[d->audioStream]->codec, d->codec, NULL );
+
+    avcodec_open2( d->audioStream_ctx, d->codec, NULL );
 
     double ffpos = (double)d->ic->streams[d->audioStream]->start_time / (double)AV_TIME_BASE;
     d->position = (long)(ffpos * d->config.sample_rate);
@@ -239,20 +265,28 @@ void FFMPEGDecoder::closeFile() {
     }
     if( d->packetSize > 0 ) {
 #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(57, 7, 0)
-        av_free_packet(&d->packet);
+        av_free_packet(&d->_packet);
 #else
-        av_packet_unref( &d->packet );
+        av_packet_unref( d->packet );
 #endif
+        d->packet = NULL;
         d->packetSize = 0;
     }
 
     if( d->codec ) {
-        avcodec_close( d->ic->streams[d->audioStream]->codec );
+        avcodec_close( d->audioStream_ctx );
+#if LIBAVFORMAT_VERSION_INT >= AV_VERSION_INT(57, 33, 100)
+        avcodec_free_context(&d->audioStream_ctx);
+#else
+        d->audioStream_ctx = NULL;
+#endif
         d->codec = 0;
     }
     if( d->ic ) {
         // make sure av_close_input_file doesn't actually close the file
+#if LIBAVFORMAT_VERSION_INT < AV_VERSION_INT(59, 0, 100)
         d->ic->iformat->flags = d->ic->iformat->flags | AVFMT_NOFILE;
+#endif
         avformat_close_input( &d->ic );
         d->ic = 0;
     }
@@ -263,27 +297,34 @@ void FFMPEGDecoder::closeFile() {
 
 bool FFMPEGDecoder::readPacket() {
     do {
-        av_init_packet(&d->packet);
-        if ( av_read_frame(d->ic, &d->packet) < 0 ) {
+#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 12, 100)
+        d->packet = av_packet_alloc();
+#else
+        av_init_packet(&d->_packet);
+        d->packet = &d->_packet;
+#endif
+        if ( av_read_frame(d->ic, d->packet) < 0 ) {
 #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(57, 7, 0)
-            av_free_packet(&d->packet);
+            av_free_packet(&d->_packet);
 #else
-            av_packet_unref( &d->packet );
+            av_packet_unref( d->packet );
 #endif
+            d->packet = NULL;
             d->packetSize = 0;
             d->packetData = 0;
             return false;
         }
-        if (d->packet.stream_index == d->audioStream) {
-            d->packetSize = d->packet.size;
-            d->packetData = d->packet.data;
+        if (d->packet->stream_index == d->audioStream) {
+            d->packetSize = d->packet->size;
+            d->packetData = d->packet->data;
             return true;
         }
 #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(57, 7, 0)
-        av_free_packet(&d->packet);
+        av_free_packet(&d->_packet);
 #else
-        av_packet_unref(&d->packet);
+        av_packet_unref(d->packet);
 #endif
+        d->packet = NULL;
     } while (true);
 
     return false;
@@ -324,7 +365,7 @@ bool FFMPEGDecoder::readFrame(AudioFrame* frame)
             return false;
         }
 
-    assert(d->packet.stream_index == d->audioStream);
+    assert(d->packet->stream_index == d->audioStream);
 
 retry:
 #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(55, 45, 101)
@@ -336,19 +377,43 @@ retry:
         return false;
     }
     int decoded;
-    int len = avcodec_decode_audio4( d->ic->streams[d->audioStream]->codec,
+
+#if LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(57, 12, 100)
+    int len = avcodec_receive_frame(d->audioStream_ctx, decodeFrame);
+    if (len == 0) {
+        decoded = 1;
+    }
+    else if (len == AVERROR(EAGAIN)) {
+        len = 0;
+    }
+                    
+    if (len == 0) {
+        len = avcodec_send_packet(d->audioStream_ctx, d->packet);
+        if (len == AVERROR(EAGAIN)) {
+            len = 0;
+        }
+        else
+        {
+            len = d->packet->size;
+            d->packetSize = d->packet->size;
+        }
+    }
+#else
+    int len = avcodec_decode_audio4( d->audioStream_ctx,
                                     decodeFrame, &decoded,
-                                    &d->packet );
+                                    d->packet );
 #if !defined(FFMPEG_AVFRAME_HAVE_PKT_SIZE)
-    d->packetSize = d->packet.size;
+    d->packetSize = d->packet->size;
 #else
     d->packetSize = decodeFrame->pkt_size;
 #endif
+#endif
+
     d->buffer = decodeFrame->data;
 #if !defined(FFMPEG_AVFRAME_HAVE_CHANNELS)
-    d->buffer_size = decodeFrame->nb_samples * d->ic->streams[d->audioStream]->codec->channels * av_get_bytes_per_sample(d->ic->streams[d->audioStream]->codec->sample_fmt);
+    d->buffer_size = decodeFrame->nb_samples * d->ic->streams[d->audioStream]->CODECPAR->channels * av_get_bytes_per_sample(d->ic->streams[d->audioStream]->codec->sample_fmt);
 #else
-    d->buffer_size = decodeFrame->nb_samples * decodeFrame->channels * av_get_bytes_per_sample(d->ic->streams[d->audioStream]->codec->sample_fmt);
+    d->buffer_size = decodeFrame->nb_samples * decodeFrame->channels * av_get_bytes_per_sample(d->audioStream_ctx->sample_fmt);
 #endif
 
     if (len <= 0) {
@@ -394,10 +459,11 @@ retry:
     if( d->packetSize <= 0 )
     {
 #if LIBAVCODEC_VERSION_INT < AV_VERSION_INT(57, 7, 0)
-        av_free_packet(&d->packet);
+        av_free_packet(&d->_packet);
 #else
-        av_packet_unref( &d->packet );
+        av_packet_unref( d->packet );
 #endif
+    d->packet = NULL;
     }
 
     frame->pos = (d->position*1000)/d->config.sample_rate;