fix: Properly handle ATSC CC in private MPEG-2 streams

This commit fixes two issues:

1. ATSC CC data in private MPEG-2 streams (stream type 0x06) was not
   being processed. The code returned CCX_PRIVATE_MPEG2_CC buffer type
   which was never properly implemented - it just dumped debug output
   and returned placeholder bytes.

   Fix: Treat ATSC CC in private MPEG-2 streams the same as in
   user-private streams (0x80-0x8F) by returning CCX_PES buffer type.
   Both contain the same CC data format and should use the same
   processing path.

2. Several dump() calls were using CCX_DMT_GENERIC_NOTICES which is
   enabled by default, causing binary output to flood the terminal
   when processing certain files.

   Fix: Changed to appropriate debug-only masks (CCX_DMT_VERBOSE,
   CCX_DMT_PARSE) so binary dumps only appear when debug mode is
   explicitly enabled.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <[email protected]>

Author: cfsmp3

src/lib_ccx/avc_functions.c

@@ -379,11 +379,10 @@ void sei_rbsp(struct avc_ctx *ctx, unsigned char *seibuf, unsigned char *seiend)
 	}
 	else
 	{
-		// TODO: This really really looks bad
-		mprint("WARNING: Unexpected SEI unit length...trying to continue.");
-		temp_debug = 1;
-		mprint("\n Failed block (at sei_rbsp) was:\n");
-		dump(CCX_DMT_GENERIC_NOTICES, (unsigned char *)seibuf, seiend - seibuf, 0, 0);
+		// Unexpected SEI length - common with malformed streams, don't spam output
+		dbg_print(CCX_DMT_VERBOSE, "WARNING: Unexpected SEI unit length (parsed to %p, expected %p)...trying to continue.\n",
+			  (void *)tbuf, (void *)(seiend - 1));
+		dump(CCX_DMT_VERBOSE, (unsigned char *)seibuf, seiend - seibuf, 0, 0);
 
 		ctx->num_unexpected_sei_length++;
 	}

src/lib_ccx/general_loop.c

@@ -75,7 +75,7 @@ int ps_get_more_data(struct lib_ccx_ctx *ctx, struct demuxer_data **ppdata)
 				if (!ctx->demux_ctx->strangeheader)
 				{
 					mprint("\nNot a recognized header. Searching for next header.\n");
-					dump(CCX_DMT_GENERIC_NOTICES, nextheader, 6, 0, 0);
+					dump(CCX_DMT_PARSE, nextheader, 6, 0, 0);
 					// Only print the message once per loop / unrecognized header
 					ctx->demux_ctx->strangeheader = 1;
 				}
@@ -809,10 +809,6 @@ int process_data(struct encoder_ctx *enc_ctx, struct lib_cc_decode *dec_ctx, str
 			got = data_node->len;
 		}
 	}
-	else if (data_node->bufferdatatype == CCX_PRIVATE_MPEG2_CC)
-	{
-		got = data_node->len; // Do nothing. Still don't know how to process it
-	}
 	else if (data_node->bufferdatatype == CCX_RAW) // Raw two byte 608 data from DVR-MS/ASF
 	{
 		// The asf_get_more_data() loop sets current_pts when possible

src/lib_ccx/ts_functions.c

@@ -153,12 +153,11 @@ enum ccx_bufferdata_type get_buffer_type(struct cap_info *cinfo)
 	{
 		return CCX_TELETEXT;
 	}
-	else if (cinfo->stream == CCX_STREAM_TYPE_PRIVATE_MPEG2 && cinfo->codec == CCX_CODEC_ATSC_CC)
-	{
-		return CCX_PRIVATE_MPEG2_CC;
-	}
-	else if (cinfo->stream == CCX_STREAM_TYPE_PRIVATE_USER_MPEG2 && cinfo->codec == CCX_CODEC_ATSC_CC)
+	else if ((cinfo->stream == CCX_STREAM_TYPE_PRIVATE_MPEG2 ||
+		  cinfo->stream == CCX_STREAM_TYPE_PRIVATE_USER_MPEG2) &&
+		 cinfo->codec == CCX_CODEC_ATSC_CC)
 	{
+		// ATSC CC can be in either private stream type - process both as PES
 		return CCX_PES;
 	}
 	else
@@ -567,15 +566,6 @@ int copy_capbuf_demux_data(struct ccx_demuxer *ctx, struct demuxer_data **data,
 	if (!cinfo->capbuf || !cinfo->capbuflen)
 		return -1;
 
-	if (ptr->bufferdatatype == CCX_PRIVATE_MPEG2_CC)
-	{
-		dump(CCX_DMT_GENERIC_NOTICES, cinfo->capbuf, cinfo->capbuflen, 0, 1);
-		// Bogus data, so we return something
-		ptr->buffer[ptr->len++] = 0xFA;
-		ptr->buffer[ptr->len++] = 0x80;
-		ptr->buffer[ptr->len++] = 0x80;
-		return CCX_OK;
-	}
 	if (cinfo->codec == CCX_CODEC_TELETEXT)
 	{
 		memcpy(ptr->buffer + ptr->len, cinfo->capbuf, cinfo->capbuflen);