ffmpeg: use ffmpeg's sampleformat for output format

src/decoder/ffmpeg_plugin.c

@@ -273,7 +273,12 @@ ffmpeg_decode_internal(struct ffmpeg_context *ctx)
 		codec_context->channels = 2;
 	}
 
-	audio_format.bits = (uint8_t)16;
+#if LIBAVCODEC_VERSION_INT > ((51<<16)+(41<<8)+0)
+	audio_format.bits = (uint8_t) av_get_bits_per_sample_format(codec_context->sample_fmt);
+#else
+	/* XXX fixme 16-bit for older ffmpeg (13 Aug 2007) */
+	audio_format.bits = (uint8_t) 16;
+#endif
 	audio_format.sample_rate = (unsigned int)codec_context->sample_rate;
 	audio_format.channels = codec_context->channels;