Fix handling of zero-length frames when a codec is capable of native PLC.

Issue 9183, patch by Mihai.


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@65877 65c4cc65-6c06-0410-ace0-fbb531ad65f3

codecs/codec_ilbc.c

@@ -203,6 +203,7 @@ static struct ast_translator ilbctolin = {
 	.sample = ilbctolin_sample,
 	.desc_size = sizeof(struct ilbc_coder_pvt),
 	.buf_size = BUFFER_SAMPLES * 2,
+	.native_plc = 1,
 };
 
 static struct ast_translator lintoilbc = {

codecs/codec_speex.c

@@ -355,6 +355,7 @@ static struct ast_translator speextolin = {
 	.desc_size = sizeof(struct speex_coder_pvt),
 	.buffer_samples = BUFFER_SAMPLES,
 	.buf_size = BUFFER_SAMPLES * 2,
+	.native_plc = 1,
 };
 
 static struct ast_translator lintospeex = {

include/asterisk/translate.h

@@ -104,6 +104,7 @@ struct ast_translator {
 	int desc_size;			/*!< size of private descriptor in pvt->pvt, if any */
 	int plc_samples;		/*!< set to the plc block size if used, 0 otherwise */
 	int useplc;			/*!< current status of plc, changed at runtime */
+	int native_plc;			/*!< true if the translator can do native plc */
 
 	struct ast_module *module;	/* opaque reference to the parent module */
 

main/translate.c

@@ -174,6 +174,8 @@ static int framein(struct ast_trans_pvt *pvt, struct ast_frame *f)
 				pvt->samples += l;
 				pvt->datalen = pvt->samples * 2;	/* SLIN has 2bytes for 1sample */
 			}
+			/* We don't want generic PLC. If the codec has native PLC, then do that */
+			if (!pvt->t->native_plc)
 				return 0;
 		}
 		if (pvt->samples + f->samples > pvt->t->buffer_samples) {