depot/third_party/nixpkgs/pkgs/tools/audio/loudgain/support-ffmpeg-7.patch

From 50741b98fb4b932759f05e8d208d80d93bcc8261 Mon Sep 17 00:00:00 2001
From: Hugh McMaster <hugh.mcmaster@outlook.com>
Date: Mon, 29 Jul 2024 23:15:35 +1000
Subject: [PATCH] src/scan.c: Update for FFmpeg 7.0

---
 src/scan.c | 40 +++++++++++++++++++++-------------------
 1 file changed, 21 insertions(+), 19 deletions(-)

diff --git a/src/scan.c b/src/scan.c
index 85b36b3..91eb261 100644
--- a/src/scan.c
+++ b/src/scan.c
@@ -119,7 +119,7 @@ int scan_file(const char *file, unsigned index) {
 	AVCodecContext *ctx;
 
 	AVFrame *frame;
-	AVPacket packet;
+	AVPacket *packet;
 
 	SwrContext *swr;
 
@@ -177,8 +177,8 @@ int scan_file(const char *file, unsigned index) {
 	}
 
   // try to get default channel layout (they aren’t specified in .wav files)
-  if (!ctx->channel_layout)
-    ctx->channel_layout = av_get_default_channel_layout(ctx->channels);
+  if (ctx->ch_layout.order == AV_CHANNEL_ORDER_UNSPEC)
+    av_channel_layout_default(&ctx->ch_layout, ctx->ch_layout.nb_channels);
 
   // show some information about the file
   // only show bits/sample where it makes sense
@@ -187,21 +187,21 @@ int scan_file(const char *file, unsigned index) {
     snprintf(infotext, sizeof(infotext), "%d bit, ",
       ctx->bits_per_raw_sample > 0 ? ctx->bits_per_raw_sample : ctx->bits_per_coded_sample);
   }
-  av_get_channel_layout_string(infobuf, sizeof(infobuf), -1, ctx->channel_layout);
+  av_channel_layout_describe(&ctx->ch_layout, infobuf, sizeof(infobuf));
   ok_printf("Stream #%d: %s, %s%d Hz, %d ch, %s",
-    stream_id, codec->long_name, infotext, ctx->sample_rate, ctx->channels, infobuf);
+    stream_id, codec->long_name, infotext, ctx->sample_rate, ctx->ch_layout.nb_channels, infobuf);
 
 	scan_codecs[index] = codec -> id;
 
-	av_init_packet(&packet);
+	packet = av_packet_alloc();
 
-	packet.data = buffer;
-	packet.size = buffer_size;
+	packet->data = buffer;
+	packet->size = buffer_size;
 
 	swr = swr_alloc();
 
 	*ebur128 = ebur128_init(
-		ctx -> channels, ctx -> sample_rate,
+		ctx->ch_layout.nb_channels, ctx->sample_rate,
 		EBUR128_MODE_S | EBUR128_MODE_I | EBUR128_MODE_LRA |
 		EBUR128_MODE_SAMPLE_PEAK | EBUR128_MODE_TRUE_PEAK
 	);
@@ -222,10 +222,10 @@ int scan_file(const char *file, unsigned index) {
 
 	progress_bar(0, 0, 0, 0);
 
-	while (av_read_frame(container, &packet) >= 0) {
-		if (packet.stream_index == stream_id) {
+	while (av_read_frame(container, packet) >= 0) {
+		if (packet->stream_index == stream_id) {
 
-      rc = avcodec_send_packet(ctx, &packet);
+      rc = avcodec_send_packet(ctx, packet);
       if (rc < 0) {
         err_printf("Error while sending a packet to the decoder");
         break;
@@ -252,7 +252,7 @@ int scan_file(const char *file, unsigned index) {
       av_frame_unref(frame);
     }
 
-		av_packet_unref(&packet);
+		av_packet_unref(packet);
 	}
 
   // complete progress bar for very short files (only cosmetic)
@@ -263,9 +263,11 @@ int scan_file(const char *file, unsigned index) {
 
 	av_frame_free(&frame);
 
+        av_packet_free(&packet);
+
 	swr_free(&swr);
 
-	avcodec_close(ctx);
+	avcodec_free_context(&ctx);
 
 	avformat_close_input(&container);
 
@@ -413,12 +415,12 @@ static void scan_frame(ebur128_state *ebur128, AVFrame *frame,
 	int                 out_linesize;
 	enum AVSampleFormat out_fmt = AV_SAMPLE_FMT_S16;
 
-	av_opt_set_channel_layout(swr, "in_channel_layout", frame -> channel_layout, 0);
-	av_opt_set_channel_layout(swr, "out_channel_layout", frame -> channel_layout, 0);
+	av_opt_set_chlayout(swr, "in_chlayout", &frame->ch_layout, 0);
+	av_opt_set_chlayout(swr, "out_chlayout", &frame->ch_layout, 0);
 
   // add channel count to properly handle .wav reading
-  av_opt_set_int(swr, "in_channel_count",  frame -> channels, 0);
-  av_opt_set_int(swr, "out_channel_count", frame -> channels, 0);
+  av_opt_set_int(swr, "in_channel_count",  frame->ch_layout.nb_channels, 0);
+  av_opt_set_int(swr, "out_channel_count", frame->ch_layout.nb_channels, 0);
 
   av_opt_set_int(swr, "in_sample_rate", frame -> sample_rate, 0);
   av_opt_set_int(swr, "out_sample_rate", frame -> sample_rate, 0);
@@ -434,7 +436,7 @@ static void scan_frame(ebur128_state *ebur128, AVFrame *frame,
 	}
 
 	out_size = av_samples_get_buffer_size(
-		&out_linesize, frame -> channels, frame -> nb_samples, out_fmt, 0
+		&out_linesize, frame->ch_layout.nb_channels, frame->nb_samples, out_fmt, 0
 	);
 
 	out_data = av_malloc(out_size);