avcodec/libmp3lame: make it possible to set copyright/original flags

doc/encoders.texi

@@ -864,6 +864,13 @@ Enable the encoder to use ABR when set to 1. The @command{lame}
 @option{--abr} sets the target bitrate, while this options only
 tells FFmpeg to use ABR still relies on @option{b} to set bitrate.
 
+@item copyright (@emph{-c})
+Set MPEG audio copyright flag when set to 1. The default value is 0
+(disabled).
+
+@item original (@emph{-o})
+Set MPEG audio original flag when set to 1. The default value is 1
+(enabled).
 @end table
 
 @section libopencore-amrnb

libavcodec/libmp3lame.c

@@ -55,6 +55,8 @@ typedef struct LAMEContext {
     float *samples_flt[2];
     AudioFrameQueue afq;
     AVFloatDSPContext *fdsp;
+    int copyright;
+    int original;
 } LAMEContext;
 
 
@@ -137,6 +139,12 @@ static av_cold int mp3lame_encode_init(AVCodecContext *avctx)
     /* bit reservoir usage */
     lame_set_disable_reservoir(s->gfp, !s->reservoir);
 
+    /* copyright flag */
+    lame_set_copyright(s->gfp, s->copyright);
+
+    /* original flag */
+    lame_set_original(s->gfp, s->original);
+
     /* set specified parameters */
     if (lame_init_params(s->gfp) < 0) {
         ret = AVERROR_EXTERNAL;
@@ -303,9 +311,11 @@ static int mp3lame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
 #define OFFSET(x) offsetof(LAMEContext, x)
 #define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {
-    { "reservoir",    "use bit reservoir", OFFSET(reservoir),    AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AE },
-    { "joint_stereo", "use joint stereo",  OFFSET(joint_stereo), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AE },
-    { "abr",          "use ABR",           OFFSET(abr),          AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AE },
+    { "reservoir",    "use bit reservoir",  OFFSET(reservoir),    AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AE },
+    { "joint_stereo", "use joint stereo",   OFFSET(joint_stereo), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AE },
+    { "abr",          "use ABR",            OFFSET(abr),          AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AE },
+    { "copyright",    "set copyright flag", OFFSET(copyright),    AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AE},
+    { "original",     "set original flag",  OFFSET(original),     AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, AE},
     { NULL },
 };