RC_BITRATE_MODE:
set BITS_EXCEEDED to iCurrentBitsLevel and allows QP adjust
in RcCalculatePictureQp().
RC_BUFFERBASED_MODE:
use buffer status to adjust the video quality.
RC_TIMESTAMP_MODE:
bit rate control based on timestamp, introduced in release 1.4.
Default to use RC_QUALITY_MODE.
Signed-off-by: Linjie Fu
---
libavcodec/libopenh264enc.c | 15 ++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/libavcodec/libopenh264enc.c b/libavcodec/libopenh264enc.c
index 245752d..dc3bd53 100644
--- a/libavcodec/libopenh264enc.c
+++ b/libavcodec/libopenh264enc.c
@@ -49,6 +49,9 @@ typedef struct SVCContext {
int skip_frames;
int skipped;
int cabac;
+
+// rate control mode
+int rc_mode;
} SVCContext;
#define OFFSET(x) offsetof(SVCContext, x)
@@ -73,6 +76,16 @@ static const AVOption options[] = {
{ "max_nal_size", "set maximum NAL size in bytes", OFFSET(max_nal_size),
AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, VE },
{ "allow_skip_frames", "allow skipping frames to hit the target bitrate",
OFFSET(skip_frames), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, VE },
{ "cabac", "Enable cabac", OFFSET(cabac), AV_OPT_TYPE_INT, { .i64 = 0 },
0, 1, VE },
+
+{ "rc_mode", "Select rate control mode", OFFSET(rc_mode), AV_OPT_TYPE_INT,
{ .i64 = RC_QUALITY_MODE }, RC_OFF_MODE, RC_TIMESTAMP_MODE, VE, "rc_mode" },
+{ "off", "bit rate control off",
0, AV_OPT_TYPE_CONST, { .i64 = RC_OFF_MODE }, 0, 0, VE,
"rc_mode" },
+{ "quality", "quality mode",
0, AV_OPT_TYPE_CONST, { .i64 = RC_QUALITY_MODE }, 0, 0, VE,
"rc_mode" },
+{ "bitrate", "bitrate mode",
0, AV_OPT_TYPE_CONST, { .i64 = RC_BITRATE_MODE }, 0, 0, VE,
"rc_mode" },
+{ "buffer","using buffer status to adjust the video quality (no
bitrate control)", 0, AV_OPT_TYPE_CONST, { .i64 = RC_BUFFERBASED_MODE }, 0, 0,
VE, "rc_mode" },
+#if OPENH264_VER_AT_LEAST(1, 4)
+{ "timestamp", "bit rate control based on timestamp",
0, AV_OPT_TYPE_CONST, { .i64 = RC_TIMESTAMP_MODE }, 0, 0, VE,
"rc_mode" },
+#endif
+
{ NULL }
};
@@ -136,7 +149,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
param.iPicHeight = avctx->height;
param.iTargetBitrate = avctx->bit_rate > 0 ? avctx->bit_rate :
TARGET_BITRATE_DEFAULT;
param.iMaxBitrate= FFMAX(avctx->rc_max_rate,
avctx->bit_rate);
-param.iRCMode= RC_QUALITY_MODE;
+param.iRCMode= s->rc_mode;
if (avctx->qmax >= 0)
param.iMaxQp = av_clip(avctx->qmax, 1, 51);
if (avctx->qmin >= 0)
--
2.7.4
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