lavc: deprecate channel count/layout changing side data

They are incompatible with the new channel layout scheme and no decoder
uses them.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/decode.c

@@ -91,6 +91,8 @@ static int apply_param_change(AVCodecContext *avctx, const AVPacket *avpkt)
     flags = bytestream_get_le32(&data);
     size -= 4;
 
+#if FF_API_OLD_CHANNEL_LAYOUT
+FF_DISABLE_DEPRECATION_WARNINGS
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
         if (size < 4)
             goto fail;
@@ -109,6 +111,8 @@ static int apply_param_change(AVCodecContext *avctx, const AVPacket *avpkt)
         avctx->channel_layout = bytestream_get_le64(&data);
         size -= 8;
     }
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
         if (size < 4)
             goto fail;

libavcodec/packet.h

@@ -447,8 +447,13 @@ typedef struct AVPacketList {
 #define AV_PKT_FLAG_DISPOSABLE 0x0010
 
 enum AVSideDataParamChangeFlags {
+#if FF_API_OLD_CHANNEL_LAYOUT
+    /**
+     * @deprecated those are not used by any decoder
+     */
     AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT  = 0x0001,
     AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT = 0x0002,
+#endif
     AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE    = 0x0004,
     AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS     = 0x0008,
 };

libavformat/dump.c

@@ -164,8 +164,11 @@ static void dump_paramchange(void *ctx, const AVPacketSideData *sd)
 {
     int size = sd->size;
     const uint8_t *data = sd->data;
-    uint32_t flags, channels, sample_rate, width, height;
+    uint32_t flags, sample_rate, width, height;
+#if FF_API_OLD_CHANNEL_LAYOUT
+    uint32_t channels;
     uint64_t layout;
+#endif
 
     if (!data || sd->size < 4)
         goto fail;
@@ -174,6 +177,8 @@ static void dump_paramchange(void *ctx, const AVPacketSideData *sd)
     data += 4;
     size -= 4;
 
+#if FF_API_OLD_CHANNEL_LAYOUT
+FF_DISABLE_DEPRECATION_WARNINGS
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
         if (size < 4)
             goto fail;
@@ -191,6 +196,8 @@ static void dump_paramchange(void *ctx, const AVPacketSideData *sd)
         av_log(ctx, AV_LOG_INFO,
                "channel layout: %s, ", av_get_channel_name(layout));
     }
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif /* FF_API_OLD_CHANNEL_LAYOUT */
     if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
         if (size < 4)
             goto fail;

libavformat/nutenc.c

@@ -894,6 +894,7 @@ static int write_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int
                 break;
             case AV_PKT_DATA_PARAM_CHANGE:
                 flags = bytestream_get_le32(&data);
+#if FF_API_OLD_CHANNEL_LAYOUT
                 if (flags & AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT) {
                     put_str(dyn_bc, "Channels");
                     put_s(dyn_bc, bytestream_get_le32(&data));
@@ -907,6 +908,7 @@ static int write_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int
                     avio_write(dyn_bc, data, 8); data+=8;
                     sm_data_count++;
                 }
+#endif
                 if (flags & AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE) {
                     put_str(dyn_bc, "SampleRate");
                     put_s(dyn_bc, bytestream_get_le32(&data));

libavformat/utils.c

@@ -1329,6 +1329,9 @@ int ff_add_param_change(AVPacket *pkt, int32_t channels,
     uint8_t *data;
     if (!pkt)
         return AVERROR(EINVAL);
+
+#if FF_API_OLD_CHANNEL_LAYOUT
+FF_DISABLE_DEPRECATION_WARNINGS
     if (channels) {
         size  += 4;
         flags |= AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT;
@@ -1337,6 +1340,8 @@ int ff_add_param_change(AVPacket *pkt, int32_t channels,
         size  += 8;
         flags |= AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT;
     }
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
     if (sample_rate) {
         size  += 4;
         flags |= AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE;
@@ -1349,10 +1354,14 @@ int ff_add_param_change(AVPacket *pkt, int32_t channels,
     if (!data)
         return AVERROR(ENOMEM);
     bytestream_put_le32(&data, flags);
+#if FF_API_OLD_CHANNEL_LAYOUT
+FF_DISABLE_DEPRECATION_WARNINGS
     if (channels)
         bytestream_put_le32(&data, channels);
     if (channel_layout)
         bytestream_put_le64(&data, channel_layout);
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
     if (sample_rate)
         bytestream_put_le32(&data, sample_rate);
     if (width || height) {