mmaldec: refactor to have more context per MMAL input buffer

The next commit needs 1 bit of additional information per MMAL buffer
sent to the MMAL input port. This information will be needed when the
buffer is recycled (i.e. returned by the input port's callback).
Normally, we could use MMAL_BUFFER_HEADER_FLAG_USER0, but that is
unexpectedly not preserved.

Do this by storing a pointer to FFBufferEntry in the MMAL buffer's
user data, instead of an AVBufferRef. This also changes the lifetime
of FFBufferEntry.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/mmaldec.c

@@ -188,8 +188,9 @@ static av_cold int ffmmal_close_decoder(AVCodecContext *avctx)
 static void input_callback(MMAL_PORT_T *port, MMAL_BUFFER_HEADER_T *buffer)
 {
     if (!buffer->cmd) {
-        AVBufferRef *buf = buffer->user_data;
-        av_buffer_unref(&buf);
+        FFBufferEntry *entry = buffer->user_data;
+        av_buffer_unref(&entry->ref);
+        av_free(entry);
     }
     mmal_buffer_header_release(buffer);
 }
@@ -535,19 +536,19 @@ static int ffmmal_fill_input_port(AVCodecContext *avctx)
         mbuffer->flags = buffer->flags;
         mbuffer->data = buffer->data;
         mbuffer->length = buffer->length;
-        mbuffer->user_data = buffer->ref;
+        mbuffer->user_data = buffer;
         mbuffer->alloc_size = ctx->decoder->input[0]->buffer_size;
 
-        if ((status = mmal_port_send_buffer(ctx->decoder->input[0], mbuffer))) {
-            mmal_buffer_header_release(mbuffer);
-            av_buffer_unref(&buffer->ref);
-        }
-
         // Remove from start of the list
         ctx->waiting_buffers = buffer->next;
         if (ctx->waiting_buffers_tail == buffer)
             ctx->waiting_buffers_tail = NULL;
-        av_free(buffer);
+
+        if ((status = mmal_port_send_buffer(ctx->decoder->input[0], mbuffer))) {
+            mmal_buffer_header_release(mbuffer);
+            av_buffer_unref(&buffer->ref);
+            av_free(buffer);
+        }
 
         if (status) {
             av_log(avctx, AV_LOG_ERROR, "MMAL error %d when sending input\n", (int)status);