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vaapi_encode: Support more RC modes

Browse Source 
Allow setting the mode explicitly, and try to make a sensible choice
given the available parameters if not.
pull/325/head
Mark Thompson 6 years ago
parent 9d5ca71ec2
commit f4d7bd6cdb
3 changed files with 358 additions and 113 deletions
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  1. 24
      doc/encoders.texi
  2. 382
      libavcodec/vaapi_encode.c
  3. 65
      libavcodec/vaapi_encode.h

24
doc/encoders.texi
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@ -2824,6 +2824,30 @@ Set the B-frame reference depth. When set to one (the default), all B-frames
will refer only to P- or I-frames. When set to greater values multiple layers
of B-frames will be present, frames in each layer only referring to frames in
higher layers.
@item rc_mode
Set the rate control mode to use. A given driver may only support a subset of
modes.
Possible modes:
@table @option
@item auto
Choose the mode automatically based on driver support and the other options.
This is the default.
@item CQP
Constant-quality.
@item CBR
Constant-bitrate.
@item VBR
Variable-bitrate.
@item ICQ
Intelligent constant-quality.
@item QVBR
Quality-defined variable-bitrate.
@item AVBR
Average variable bitrate.
@end table
@end table
Each encoder also has its own specific options:

382
libavcodec/vaapi_encode.c
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@ -1283,17 +1283,42 @@ fail:
return err;
}
static const VAAPIEncodeRCMode vaapi_encode_rc_modes[] = {
// Bitrate Quality
// | Maxrate | HRD/VBV
{ 0 }, // | | | |
{ RC_MODE_CQP, "CQP", 1, VA_RC_CQP, 0, 0, 1, 0 },
{ RC_MODE_CBR, "CBR", 1, VA_RC_CBR, 1, 0, 0, 1 },
{ RC_MODE_VBR, "VBR", 1, VA_RC_VBR, 1, 1, 0, 1 },
#if VA_CHECK_VERSION(1, 1, 0)
{ RC_MODE_ICQ, "ICQ", 1, VA_RC_ICQ, 0, 0, 1, 0 },
#else
{ RC_MODE_ICQ, "ICQ", 0 },
#endif
#if VA_CHECK_VERSION(1, 3, 0)
{ RC_MODE_QVBR, "QVBR", 1, VA_RC_QVBR, 1, 1, 1, 1 },
{ RC_MODE_AVBR, "AVBR", 0, VA_RC_AVBR, 1, 0, 0, 0 },
#else
{ RC_MODE_QVBR, "QVBR", 0 },
{ RC_MODE_AVBR, "AVBR", 0 },
#endif
};
static av_cold int vaapi_encode_init_rate_control(AVCodecContext *avctx)
{
VAAPIEncodeContext *ctx = avctx->priv_data;
uint32_t supported_va_rc_modes;
const VAAPIEncodeRCMode *rc_mode;
int64_t rc_bits_per_second;
int rc_target_percentage;
int rc_window_size;
int rc_quality;
int64_t hrd_buffer_size;
int64_t hrd_initial_buffer_fullness;
int fr_num, fr_den;
VAConfigAttrib rc_attr = { VAConfigAttribRateControl };
VAStatus vas;
char supported_rc_modes_string[64];
vas = vaGetConfigAttributes(ctx->hwctx->display,
ctx->va_profile, ctx->va_entrypoint,
@ -1303,119 +1328,213 @@ static av_cold int vaapi_encode_init_rate_control(AVCodecContext *avctx)
"config attribute: %d (%s).\n", vas, vaErrorStr(vas));
return AVERROR_EXTERNAL;
}
if (rc_attr.value == VA_ATTRIB_NOT_SUPPORTED) {
av_log(avctx, AV_LOG_VERBOSE, "Driver does not report any "
"supported rate control modes: assuming constant-quality.\n");
ctx->va_rc_mode = VA_RC_CQP;
return 0;
}
if (ctx->codec->flags & FLAG_CONSTANT_QUALITY_ONLY ||
avctx->flags & AV_CODEC_FLAG_QSCALE ||
avctx->bit_rate <= 0) {
if (rc_attr.value & VA_RC_CQP) {
av_log(avctx, AV_LOG_VERBOSE, "Using constant-quality mode.\n");
ctx->va_rc_mode = VA_RC_CQP;
if (avctx->bit_rate > 0 || avctx->rc_max_rate > 0) {
av_log(avctx, AV_LOG_WARNING, "Bitrate target parameters "
"ignored in constant-quality mode.\n");
"supported rate control modes: assuming CQP only.\n");
supported_va_rc_modes = VA_RC_CQP;
strcpy(supported_rc_modes_string, "unknown");
} else {
char *str = supported_rc_modes_string;
size_t len = sizeof(supported_rc_modes_string);
int i, first = 1, res;
supported_va_rc_modes = rc_attr.value;
for (i = 0; i < FF_ARRAY_ELEMS(vaapi_encode_rc_modes); i++) {
rc_mode = &vaapi_encode_rc_modes[i];
if (supported_va_rc_modes & rc_mode->va_mode) {
res = snprintf(str, len, "%s%s",
first ? "" : ", ", rc_mode->name);
first = 0;
if (res < 0) {
*str = 0;
break;
}
len -= res;
str += res;
if (len == 0)
break;
}
return 0;
} else {
av_log(avctx, AV_LOG_ERROR, "Driver does not support "
"constant-quality mode (%#x).\n", rc_attr.value);
return AVERROR(EINVAL);
}
}
if (!(rc_attr.value & (VA_RC_CBR | VA_RC_VBR))) {
av_log(avctx, AV_LOG_ERROR, "Driver does not support any "
"bitrate-targetted rate control modes.\n");
return AVERROR(EINVAL);
av_log(avctx, AV_LOG_DEBUG, "Driver supports RC modes %s.\n",
supported_rc_modes_string);
}
// Rate control mode selection:
// * If the user has set a mode explicitly with the rc_mode option,
// use it and fail if it is not available.
// * If an explicit QP option has been set, use CQP.
// * If the codec is CQ-only, use CQP.
// * If the QSCALE avcodec option is set, use CQP.
// * If bitrate and quality are both set, try QVBR.
// * If quality is set, try ICQ, then CQP.
// * If bitrate and maxrate are set and have the same value, try CBR.
// * If a bitrate is set, try AVBR, then VBR, then CBR.
// * If no bitrate is set, try ICQ, then CQP.
#define TRY_RC_MODE(mode, fail) do { \
rc_mode = &vaapi_encode_rc_modes[mode]; \
if (!(rc_mode->va_mode & supported_va_rc_modes)) { \
if (fail) { \
av_log(avctx, AV_LOG_ERROR, "Driver does not support %s " \
"RC mode (supported modes: %s).\n", rc_mode->name, \
supported_rc_modes_string); \
return AVERROR(EINVAL); \
} \
av_log(avctx, AV_LOG_DEBUG, "Driver does not support %s " \
"RC mode.\n", rc_mode->name); \
rc_mode = NULL; \
} else { \
goto rc_mode_found; \
} \
} while (0)
if (ctx->explicit_rc_mode)
TRY_RC_MODE(ctx->explicit_rc_mode, 1);
if (ctx->explicit_qp)
TRY_RC_MODE(RC_MODE_CQP, 1);
if (ctx->codec->flags & FLAG_CONSTANT_QUALITY_ONLY)
TRY_RC_MODE(RC_MODE_CQP, 1);
if (avctx->flags & AV_CODEC_FLAG_QSCALE)
TRY_RC_MODE(RC_MODE_CQP, 1);
if (avctx->bit_rate > 0 && avctx->global_quality > 0)
TRY_RC_MODE(RC_MODE_QVBR, 0);
if (avctx->global_quality > 0) {
TRY_RC_MODE(RC_MODE_ICQ, 0);
TRY_RC_MODE(RC_MODE_CQP, 0);
}
if (avctx->bit_rate > 0 && avctx->rc_max_rate == avctx->bit_rate)
TRY_RC_MODE(RC_MODE_CBR, 0);
if (avctx->bit_rate > 0) {
TRY_RC_MODE(RC_MODE_AVBR, 0);
TRY_RC_MODE(RC_MODE_VBR, 0);
TRY_RC_MODE(RC_MODE_CBR, 0);
} else {
TRY_RC_MODE(RC_MODE_ICQ, 0);
TRY_RC_MODE(RC_MODE_CQP, 0);
}
if (avctx->rc_buffer_size)
hrd_buffer_size = avctx->rc_buffer_size;
else if (avctx->rc_max_rate > 0)
hrd_buffer_size = avctx->rc_max_rate;
else
hrd_buffer_size = avctx->bit_rate;
if (avctx->rc_initial_buffer_occupancy) {
if (avctx->rc_initial_buffer_occupancy > hrd_buffer_size) {
av_log(avctx, AV_LOG_ERROR, "Invalid RC buffer settings: "
"must have initial buffer size (%d) < "
"buffer size (%"PRId64").\n",
avctx->rc_initial_buffer_occupancy, hrd_buffer_size);
av_log(avctx, AV_LOG_ERROR, "Driver does not support any "
"RC mode compatible with selected options "
"(supported modes: %s).\n", supported_rc_modes_string);
return AVERROR(EINVAL);
rc_mode_found:
if (rc_mode->bitrate) {
if (avctx->bit_rate <= 0) {
av_log(avctx, AV_LOG_ERROR, "Bitrate must be set for %s "
"RC mode.\n", rc_mode->name);
return AVERROR(EINVAL);
}
hrd_initial_buffer_fullness = avctx->rc_initial_buffer_occupancy;
} else {
hrd_initial_buffer_fullness = hrd_buffer_size * 3 / 4;
}
if (avctx->rc_max_rate && avctx->rc_max_rate < avctx->bit_rate) {
av_log(avctx, AV_LOG_ERROR, "Invalid bitrate settings: must have "
"bitrate (%"PRId64") <= maxrate (%"PRId64").\n",
avctx->bit_rate, avctx->rc_max_rate);
return AVERROR(EINVAL);
}
if (rc_mode->mode == RC_MODE_AVBR) {
// For maximum confusion AVBR is hacked into the existing API
// by overloading some of the fields with completely different
// meanings.
if (avctx->rc_max_rate > avctx->bit_rate) {
if (!(rc_attr.value & VA_RC_VBR)) {
av_log(avctx, AV_LOG_WARNING, "Driver does not support "
"VBR mode (%#x), using CBR mode instead.\n",
rc_attr.value);
ctx->va_rc_mode = VA_RC_CBR;
// Target percentage does not apply in AVBR mode.
rc_bits_per_second = avctx->bit_rate;
rc_bits_per_second = avctx->bit_rate;
// Accuracy tolerance range for meeting the specified target
// bitrate. It's very unclear how this is actually intended
// to work - since we do want to get the specified bitrate,
// set the accuracy to 100% for now.
rc_target_percentage = 100;
} else {
ctx->va_rc_mode = VA_RC_VBR;
rc_bits_per_second = avctx->rc_max_rate;
rc_target_percentage = (avctx->bit_rate * 100) /
avctx->rc_max_rate;
}
} else if (avctx->rc_max_rate == avctx->bit_rate) {
if (!(rc_attr.value & VA_RC_CBR)) {
av_log(avctx, AV_LOG_WARNING, "Driver does not support "
"CBR mode (%#x), using VBR mode instead.\n",
rc_attr.value);
ctx->va_rc_mode = VA_RC_VBR;
// Convergence period in frames. The GOP size reflects the
// user's intended block size for cutting, so reusing that
// as the convergence period seems a reasonable default.
rc_window_size = avctx->gop_size > 0 ? avctx->gop_size : 60;
} else if (rc_mode->maxrate) {
if (avctx->rc_max_rate > 0) {
if (avctx->rc_max_rate < avctx->bit_rate) {
av_log(avctx, AV_LOG_ERROR, "Invalid bitrate settings: "
"bitrate (%"PRId64") must not be greater than "
"maxrate (%"PRId64").\n", avctx->bit_rate,
avctx->rc_max_rate);
return AVERROR(EINVAL);
}
rc_bits_per_second = avctx->rc_max_rate;
rc_target_percentage = (avctx->bit_rate * 100) /
avctx->rc_max_rate;
} else {
// We only have a target bitrate, but this mode requires
// that a maximum rate be supplied as well. Since the
// user does not want this to be a constraint, arbitrarily
// pick a maximum rate of double the target rate.
rc_bits_per_second = 2 * avctx->bit_rate;
rc_target_percentage = 50;
}
} else {
ctx->va_rc_mode = VA_RC_CBR;
if (avctx->rc_max_rate > avctx->bit_rate) {
av_log(avctx, AV_LOG_WARNING, "Max bitrate is ignored "
"in %s RC mode.\n", rc_mode->name);
}
rc_bits_per_second = avctx->bit_rate;
rc_target_percentage = 100;
}
rc_bits_per_second = avctx->bit_rate;
} else {
rc_bits_per_second = 0;
rc_target_percentage = 100;
}
if (rc_mode->quality) {
if (ctx->explicit_qp) {
rc_quality = ctx->explicit_qp;
} else if (avctx->global_quality > 0) {
rc_quality = avctx->global_quality;
} else {
rc_quality = ctx->codec->default_quality;
av_log(avctx, AV_LOG_WARNING, "No quality level set; "
"using default (%d).\n", rc_quality);
}
} else {
if (rc_attr.value & VA_RC_VBR) {
ctx->va_rc_mode = VA_RC_VBR;
// We only have a target bitrate, but VAAPI requires that a
// maximum rate be supplied as well. Since the user has
// offered no particular constraint, arbitrarily pick a
// maximum rate of double the target rate.
rc_bits_per_second = 2 * avctx->bit_rate;
rc_target_percentage = 50;
rc_quality = 0;
}
if (rc_mode->hrd) {
if (avctx->rc_buffer_size)
hrd_buffer_size = avctx->rc_buffer_size;
else if (avctx->rc_max_rate > 0)
hrd_buffer_size = avctx->rc_max_rate;
else
hrd_buffer_size = avctx->bit_rate;
if (avctx->rc_initial_buffer_occupancy) {
if (avctx->rc_initial_buffer_occupancy > hrd_buffer_size) {
av_log(avctx, AV_LOG_ERROR, "Invalid RC buffer settings: "
"must have initial buffer size (%d) <= "
"buffer size (%"PRId64").\n",
avctx->rc_initial_buffer_occupancy, hrd_buffer_size);
return AVERROR(EINVAL);
}
hrd_initial_buffer_fullness = avctx->rc_initial_buffer_occupancy;
} else {
ctx->va_rc_mode = VA_RC_CBR;
hrd_initial_buffer_fullness = hrd_buffer_size * 3 / 4;
}
rc_bits_per_second = avctx->bit_rate;
rc_target_percentage = 100;
rc_window_size = (hrd_buffer_size * 1000) / rc_bits_per_second;
} else {
if (avctx->rc_buffer_size || avctx->rc_initial_buffer_occupancy) {
av_log(avctx, AV_LOG_WARNING, "Buffering settings are ignored "
"in %s RC mode.\n", rc_mode->name);
}
}
rc_window_size = (hrd_buffer_size * 1000) / rc_bits_per_second;
hrd_buffer_size = 0;
hrd_initial_buffer_fullness = 0;
av_log(avctx, AV_LOG_VERBOSE, "RC mode: %s, %d%% of %"PRId64" bps "
"over %d ms.\n", ctx->va_rc_mode == VA_RC_VBR ? "VBR" : "CBR",
rc_target_percentage, rc_bits_per_second, rc_window_size);
av_log(avctx, AV_LOG_VERBOSE, "RC buffer: %"PRId64" bits, "
"initial fullness %"PRId64" bits.\n",
hrd_buffer_size, hrd_initial_buffer_fullness);
if (rc_mode->mode != RC_MODE_AVBR) {
// Already set (with completely different meaning) for AVBR.
rc_window_size = 1000;
}
}
if (rc_bits_per_second > UINT32_MAX ||
hrd_buffer_size > UINT32_MAX ||
@ -1425,36 +1544,70 @@ static av_cold int vaapi_encode_init_rate_control(AVCodecContext *avctx)
return AVERROR(EINVAL);
}
ctx->rc_mode = rc_mode;
ctx->rc_quality = rc_quality;
ctx->va_rc_mode = rc_mode->va_mode;
ctx->va_bit_rate = rc_bits_per_second;
ctx->config_attributes[ctx->nb_config_attributes++] =
(VAConfigAttrib) {
.type = VAConfigAttribRateControl,
.value = ctx->va_rc_mode,
};
av_log(avctx, AV_LOG_VERBOSE, "RC mode: %s.\n", rc_mode->name);
if (rc_attr.value == VA_ATTRIB_NOT_SUPPORTED) {
// This driver does not want the RC mode attribute to be set.
} else {
ctx->config_attributes[ctx->nb_config_attributes++] =
(VAConfigAttrib) {
.type = VAConfigAttribRateControl,
.value = ctx->va_rc_mode,
};
}
ctx->rc_params.misc.type = VAEncMiscParameterTypeRateControl;
ctx->rc_params.rc = (VAEncMiscParameterRateControl) {
.bits_per_second = rc_bits_per_second,
.target_percentage = rc_target_percentage,
.window_size = rc_window_size,
.initial_qp = 0,
.min_qp = (avctx->qmin > 0 ? avctx->qmin : 0),
.basic_unit_size = 0,
if (rc_mode->quality)
av_log(avctx, AV_LOG_VERBOSE, "RC quality: %d.\n", rc_quality);
if (rc_mode->va_mode != VA_RC_CQP) {
if (rc_mode->mode == RC_MODE_AVBR) {
av_log(avctx, AV_LOG_VERBOSE, "RC target: %"PRId64" bps "
"converging in %d frames with %d%% accuracy.\n",
rc_bits_per_second, rc_window_size,
rc_target_percentage);
} else if (rc_mode->bitrate) {
av_log(avctx, AV_LOG_VERBOSE, "RC target: %d%% of "
"%"PRId64" bps over %d ms.\n", rc_target_percentage,
rc_bits_per_second, rc_window_size);
}
ctx->rc_params.misc.type = VAEncMiscParameterTypeRateControl;
ctx->rc_params.rc = (VAEncMiscParameterRateControl) {
.bits_per_second = rc_bits_per_second,
.target_percentage = rc_target_percentage,
.window_size = rc_window_size,
.initial_qp = 0,
.min_qp = (avctx->qmin > 0 ? avctx->qmin : 0),
.basic_unit_size = 0,
#if VA_CHECK_VERSION(1, 1, 0)
.max_qp = (avctx->qmax > 0 ? avctx->qmax : 0),
.ICQ_quality_factor = av_clip(rc_quality, 1, 51),
.max_qp = (avctx->qmax > 0 ? avctx->qmax : 0),
#endif
};
vaapi_encode_add_global_param(avctx, &ctx->rc_params.misc,
sizeof(ctx->rc_params));
#if VA_CHECK_VERSION(1, 3, 0)
.quality_factor = rc_quality,
#endif
};
vaapi_encode_add_global_param(avctx, &ctx->rc_params.misc,
sizeof(ctx->rc_params));
}
ctx->hrd_params.misc.type = VAEncMiscParameterTypeHRD;
ctx->hrd_params.hrd = (VAEncMiscParameterHRD) {
.initial_buffer_fullness = hrd_initial_buffer_fullness,
.buffer_size = hrd_buffer_size,
};
vaapi_encode_add_global_param(avctx, &ctx->hrd_params.misc,
sizeof(ctx->hrd_params));
if (rc_mode->hrd) {
av_log(avctx, AV_LOG_VERBOSE, "RC buffer: %"PRId64" bits, "
"initial fullness %"PRId64" bits.\n",
hrd_buffer_size, hrd_initial_buffer_fullness);
ctx->hrd_params.misc.type = VAEncMiscParameterTypeHRD;
ctx->hrd_params.hrd = (VAEncMiscParameterHRD) {
.initial_buffer_fullness = hrd_initial_buffer_fullness,
.buffer_size = hrd_buffer_size,
};
vaapi_encode_add_global_param(avctx, &ctx->hrd_params.misc,
sizeof(ctx->hrd_params));
}
if (avctx->framerate.num > 0 && avctx->framerate.den > 0)
av_reduce(&fr_num, &fr_den,
@ -1463,6 +1616,9 @@ static av_cold int vaapi_encode_init_rate_control(AVCodecContext *avctx)
av_reduce(&fr_num, &fr_den,
avctx->time_base.den, avctx->time_base.num, 65535);
av_log(avctx, AV_LOG_VERBOSE, "RC framerate: %d/%d (%.2f fps).\n",
fr_num, fr_den, (double)fr_num / fr_den);
ctx->fr_params.misc.type = VAEncMiscParameterTypeFrameRate;
ctx->fr_params.fr.framerate = (unsigned int)fr_den << 16 | fr_num;

65
libavcodec/vaapi_encode.h
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@ -129,6 +129,36 @@ typedef struct VAAPIEncodeProfile {
VAProfile va_profile;
} VAAPIEncodeProfile;
enum {
RC_MODE_AUTO,
RC_MODE_CQP,
RC_MODE_CBR,
RC_MODE_VBR,
RC_MODE_ICQ,
RC_MODE_QVBR,
RC_MODE_AVBR,
RC_MODE_MAX = RC_MODE_AVBR,
};
typedef struct VAAPIEncodeRCMode {
// Mode from above enum (RC_MODE_*).
int mode;
// Name.
const char *name;
// Supported in the compile-time VAAPI version.
int supported;
// VA mode value (VA_RC_*).
uint32_t va_mode;
// Uses bitrate parameters.
int bitrate;
// Supports maxrate distinct from bitrate.
int maxrate;
// Uses quality value.
int quality;
// Supports HRD/VBV parameters.
int hrd;
} VAAPIEncodeRCMode;
typedef struct VAAPIEncodeContext {
const AVClass *class;
@ -146,6 +176,14 @@ typedef struct VAAPIEncodeContext {
// Desired B frame reference depth.
int desired_b_depth;
// Explicitly set RC mode (otherwise attempt to pick from
// available modes).
int explicit_rc_mode;
// Explicitly-set QP, for use with the "qp" options.
// (Forces CQP mode when set, overriding everything else.)
int explicit_qp;
// Desired packed headers.
unsigned int desired_packed_headers;
@ -165,6 +203,12 @@ typedef struct VAAPIEncodeContext {
// Chosen encoding profile details.
const VAAPIEncodeProfile *profile;
// Chosen rate control mode details.
const VAAPIEncodeRCMode *rc_mode;
// RC quality level - meaning depends on codec and RC mode.
// In CQP mode this sets the fixed quantiser value.
int rc_quality;
// Encoding profile (VAProfile*).
VAProfile va_profile;
// Encoding entrypoint (VAEntryoint*).
@ -296,6 +340,10 @@ typedef struct VAAPIEncodeType {
// Codec feature flags.
int flags;
// Default quality for this codec - used as quantiser or RC quality
// factor depending on RC mode.
int default_quality;
// Perform any extra codec-specific configuration after the
// codec context is initialised (set up the private data and
// add any necessary global parameters).
@ -382,5 +430,22 @@ int ff_vaapi_encode_close(AVCodecContext *avctx);
OFFSET(common.desired_b_depth), AV_OPT_TYPE_INT, \
{ .i64 = 1 }, 1, INT_MAX, FLAGS }
#define VAAPI_ENCODE_RC_MODE(name, desc) \
{ #name, desc, 0, AV_OPT_TYPE_CONST, { .i64 = RC_MODE_ ## name }, \
0, 0, FLAGS, "rc_mode" }
#define VAAPI_ENCODE_RC_OPTIONS \
{ "rc_mode",\
"Set rate control mode", \
OFFSET(common.explicit_rc_mode), AV_OPT_TYPE_INT, \
{ .i64 = RC_MODE_AUTO }, RC_MODE_AUTO, RC_MODE_MAX, FLAGS, "rc_mode" }, \
{ "auto", "Choose mode automatically based on other parameters", \
0, AV_OPT_TYPE_CONST, { .i64 = RC_MODE_AUTO }, 0, 0, FLAGS, "rc_mode" }, \
VAAPI_ENCODE_RC_MODE(CQP, "Constant-quality"), \
VAAPI_ENCODE_RC_MODE(CBR, "Constant-bitrate"), \
VAAPI_ENCODE_RC_MODE(VBR, "Variable-bitrate"), \
VAAPI_ENCODE_RC_MODE(ICQ, "Intelligent constant-quality"), \
VAAPI_ENCODE_RC_MODE(QVBR, "Quality-defined variable-bitrate"), \
VAAPI_ENCODE_RC_MODE(AVBR, "Average variable-bitrate")
#endif /* AVCODEC_VAAPI_ENCODE_H */

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