[FFmpeg-devel] [PATCH] avcodec/libmp3lame: make it possible to set copyright/original flags

["Lukáš Lalinský" <lukas@lalinsky.com>]

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I'd like the control the copyright and original bits in output MP3 frames. I've added two options to the libmp3lame encoder, the defaults are copying the defaults from LAME (original=1, copyright=0). Patch attached.

Regards,

Lukas Lalinsky

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From 3f5d5f99e862b66867a8a93c8e5928b9e866e010 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Lalinsk=C3=BD?= <lalinsky@gmail.com>
Date: Tue, 9 May 2023 08:30:03 +0200
Subject: [PATCH] avcodec/libmp3lame: make it possible to set
 copyright/original flags

---
 doc/encoders.texi       |  8 ++++++++
 libavcodec/libmp3lame.c | 16 +++++++++++++---
 2 files changed, 21 insertions(+), 3 deletions(-)

diff --git a/doc/encoders.texi b/doc/encoders.texi
index 3cb6fc1ce7..f8c691ba1a 100644
--- a/doc/encoders.texi
+++ b/doc/encoders.texi
@@ -864,6 +864,14 @@ 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
diff --git a/libavcodec/libmp3lame.c b/libavcodec/libmp3lame.c
index e119189f2a..312bc4230f 100644
--- a/libavcodec/libmp3lame.c
+++ b/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 },
 };
 
-- 
2.25.1


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