[FIX] Regression bug failing to compile with ENABLE_FFMPEG (#1728)

* Fix hardsubx_decoder.c compilation with ENABLE_FFMPEG

Fix unresolved function reference when compiling with ENABLE_FFMPEG

* Fix regression compilation ffmpeg_intgr.c to support ffmpeg 5

Fix regression bug for compiling with ENABLE_FFMPEG and ffmpeg 5, introduced in #1418

* Update CHANGES.TXT

* Update ffmpeg_intgr.c

Update for changes to FFMPEG 5 API

Author: rboy1

docs/CHANGES.TXT

@@ -48,6 +48,7 @@
 - Fix: Resolve compile-time error about implicit declarations (#1646)
 - Fix: fatal out of memory error extracting from a VOB PS
 - Fix: Unit Test Rust failing due to changes in Rust Version 1.86.0
+- Fix: Build with ENABLE_FFMPEG to support ffmpeg 5
 
 0.94 (2021-12-14)
 -----------------

src/lib_ccx/ffmpeg_intgr.c

@@ -65,7 +65,6 @@ void *init_ffmpeg(const char *path)
 	int stream_index = 0;
 	struct ffmpeg_ctx *ctx;
 	AVCodec *dec = NULL;
-	avcodec_register_all();
 
 	if (ccx_options.debug_mask & CCX_DMT_VERBOSE)
 		av_log_set_level(AV_LOG_INFO);
@@ -105,7 +104,7 @@ void *init_ffmpeg(const char *path)
 		goto fail;
 	}
 	stream_index = ret;
-	ctx->dec_ctx = ctx->ifmt->streams[stream_index]->codec;
+	ctx->dec_ctx = ctx->ifmt->streams[stream_index]->codecpar;
 	ctx->stream_index = stream_index;
 	ret = avcodec_open2(ctx->dec_ctx, dec, NULL);
 	if (ret < 0)
@@ -149,7 +148,7 @@ int ff_get_ccframe(void *arg, unsigned char *data, int maxlen)
 		return AVERROR(EAGAIN);
 	}
 
-	avcodec_send_packet(ctx->codec_ctx, &ctx->packet);
+	avcodec_send_packet(ctx->dec_ctx, &packet);
 	ret = avcodec_receive_frame(ctx->dec_ctx, ctx->frame);
 	if (ret < 0)
 	{
@@ -159,15 +158,15 @@ int ff_get_ccframe(void *arg, unsigned char *data, int maxlen)
 	{
 		return AVERROR(EAGAIN);
 	}
-	//	current_pts = av_frame_get_best_effort_timestamp(ctx->frame);
+	//	current_pts = ctx->frame->best_effort_timestamp;
 	//	if(!pts_set)
 	//		pts_set = 1;
 	//	set_fts();
 	for (int i = 0; i < ctx->frame->nb_side_data; i++)
 	{
 		if (ctx->frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)
 		{
-			ctx->frame->pts = av_frame_get_best_effort_timestamp(ctx->frame);
+			ctx->frame->pts = ctx->frame->best_effort_timestamp;
 			if (ctx->frame->side_data[i]->size > maxlen)
 				av_log(NULL, AV_LOG_ERROR, "Please consider increasing length of data\n");
 			else

src/lib_ccx/hardsubx_decoder.c

@@ -10,6 +10,9 @@
 #include <leptonica/allheaders.h>
 #include <tesseract/capi.h>
 #include "hardsubx.h"
+#ifdef ENABLE_FFMPEG
+#include "ffmpeg_intgr.h"
+#endif
 
 #ifdef DISABLE_RUST
 char *_process_frame_white_basic(struct lib_hardsubx_ctx *ctx, AVFrame *frame, int width, int height, int index)