Support demuxing 4gv codec stored in qcp files

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/avcodec.h

@@ -500,6 +500,7 @@ enum AVCodecID {
     AV_CODEC_ID_DSD_MSBF    = MKBETAG('D','S','D','M'),
     AV_CODEC_ID_DSD_LSBF_PLANAR = MKBETAG('D','S','D','1'),
     AV_CODEC_ID_DSD_MSBF_PLANAR = MKBETAG('D','S','D','8'),
+    AV_CODEC_ID_4GV         = MKBETAG('s','4','g','v'),
 
     /* subtitle codecs */
     AV_CODEC_ID_FIRST_SUBTITLE = 0x17000,          ///< A dummy ID pointing at the start of subtitle codecs.

libavcodec/codec_desc.c

@@ -2523,6 +2523,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
         .long_name = NULL_IF_CONFIG_SMALL("SMV (Selectable Mode Vocoder)"),
         .props     = AV_CODEC_PROP_LOSSY,
     },
+    {
+        .id        = AV_CODEC_ID_4GV,
+        .type      = AVMEDIA_TYPE_AUDIO,
+        .name      = "4gv",
+        .long_name = NULL_IF_CONFIG_SMALL("4GV (Fourth Generation Vocoder)"),
+        .props     = AV_CODEC_PROP_LOSSY,
+    },
     {
         .id        = AV_CODEC_ID_DSD_LSBF,
         .type      = AVMEDIA_TYPE_AUDIO,

libavformat/qcp.c

@@ -57,6 +57,11 @@ static const uint8_t guid_evrc[16] = {
     0x91, 0xef, 0x73, 0x6a, 0x51, 0x00, 0xce, 0xb4
 };
 
+static const uint8_t guid_4gv[16] = {
+    0xca, 0x29, 0xfd, 0x3c, 0x53, 0xf6, 0xf5, 0x4e,
+    0x90, 0xe9, 0xf4, 0x23, 0x6d, 0x59, 0x9b, 0x61
+};
+
 /**
  * SMV GUID as stored in the file
  */
@@ -106,6 +111,8 @@ static int qcp_read_header(AVFormatContext *s)
         st->codec->codec_id = AV_CODEC_ID_EVRC;
     } else if (!memcmp(buf, guid_smv, 16)) {
         st->codec->codec_id = AV_CODEC_ID_SMV;
+    } else if (!memcmp(buf, guid_4gv, 16)) {
+        st->codec->codec_id = AV_CODEC_ID_4GV;
     } else {
         av_log(s, AV_LOG_ERROR, "Unknown codec GUID "FF_PRI_GUID".\n",
                FF_ARG_GUID(buf));