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.
Default to use RC_QUALITY_MODE.
Signed-off-by: Linjie Fu <linjie...@intel.com>
---
libavcodec/libopenh264enc.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/libavcodec/libopenh264enc.c b/libavcodec/libopenh264enc.c
index 57313b1..f994f95 100644
--- a/libavcodec/libopenh264enc.c
+++ b/libavcodec/libopenh264enc.c
@@ -47,6 +47,9 @@ typedef struct SVCContext {
int skip_frames;
int skipped;
int cabac;
+
+ // rate control mode
+ int rc_mode;
} SVCContext;
#define OFFSET(x) offsetof(SVCContext, x)
@@ -71,6 +74,13 @@ 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" },
+ { "timestamp", "bit rate control based on timestamp",
0, AV_OPT_TYPE_CONST, { .i64 = RC_TIMESTAMP_MODE }, 0, 0, VE,
"rc_mode" },
{ NULL }
};
@@ -134,7 +144,7 @@ FF_ENABLE_DEPRECATION_WARNINGS
param.iPicHeight = avctx->height;
param.iTargetBitrate = avctx->bit_rate > 0 ? avctx->bit_rate :
2*1000*1000;
param.iMaxBitrate = FFMAX(avctx->rc_max_rate,
avctx->bit_rate);
- param.iRCMode = RC_QUALITY_MODE;
+ param.iRCMode = s->rc_mode;
// QP = 0 is not well supported, so default to (1, 51)
param.iMaxQp = avctx->qmax >= 0 ? av_clip(avctx->qmax,
1, 51) : 51;
param.iMinQp = avctx->qmin >= 0 ? av_clip(avctx->qmin,
1, param.iMaxQp) : 1;
--
2.7.4
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