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lavc/libopenh264enc: add bit rate control select support

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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 <linjie.fu@intel.com>
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Linjie Fu 2020-04-29 11:00:48 +08:00 committed by Martin Storsjö
parent e5f097eca7
commit 75fc3f97b0
1 changed files with 14 additions and 1 deletions
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15
libavcodec/libopenh264enc.c
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@ -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)