On Sun, Apr 10, 2016 at 9:49 AM, Anton Khirnov <an...@khirnov.net> wrote:
> Quoting Mark Thompson (2016-04-09 18:16:02)
>> ---
>> libavcodec/vaapi_encode_h264.c | 99
>> ++++++++++++++++++++++++++++++++----------
>> 1 file changed, 75 insertions(+), 24 deletions(-)
>>
>> diff --git a/libavcodec/vaapi_encode_h264.c b/libavcodec/vaapi_encode_h264.c
>> index 6a77ab1..a00d478 100644
>> --- a/libavcodec/vaapi_encode_h264.c
>> +++ b/libavcodec/vaapi_encode_h264.c
>> @@ -104,7 +104,15 @@ typedef struct VAAPIEncodeH264Context {
>> int64_t idr_pic_count;
>> int64_t last_idr_frame;
>>
>> - // RefPicList management.
>> + // Rate control configuration.
>> + struct {
>> + VAEncMiscParameterBuffer misc;
>> + VAEncMiscParameterRateControl rc;
>> + } rc_params;
>> + struct {
>> + VAEncMiscParameterBuffer misc;
>> + VAEncMiscParameterHRD hrd;
>> + } hrd_params;
>> } VAAPIEncodeH264Context;
>>
>>
>> @@ -506,6 +514,14 @@ static int
>> vaapi_encode_h264_init_sequence_params(AVCodecContext *avctx)
>> } else {
>> vseq->frame_cropping_flag = 0;
>> }
>> +
>> + vseq->bits_per_second = avctx->bit_rate;
>> + vseq->num_units_in_tick = avctx->time_base.num;
>> + vseq->time_scale = 2 * avctx->time_base.den;
>> +
>> + vseq->intra_period = ctx->p_per_i * (ctx->b_per_p + 1);
>> + vseq->intra_idr_period = vseq->intra_period;
>> + vseq->ip_period = ctx->b_per_p + 1;
>> }
>>
>> {
>> @@ -695,8 +711,6 @@ static av_cold int
>> vaapi_encode_h264_init_internal(AVCodecContext *avctx)
>> static const VAConfigAttrib default_config_attributes[] = {
>> { .type = VAConfigAttribRTFormat,
>> .value = VA_RT_FORMAT_YUV420 },
>> - { .type = VAConfigAttribRateControl,
>> - .value = VA_RC_CQP },
>> { .type = VAConfigAttribEncPackedHeaders,
>> .value = (VA_ENC_PACKED_HEADER_SEQUENCE |
>> VA_ENC_PACKED_HEADER_SLICE) },
>> @@ -745,8 +759,6 @@ static av_cold int
>> vaapi_encode_h264_init_internal(AVCodecContext *avctx)
>> }
>> ctx->va_entrypoint = VAEntrypointEncSlice;
>>
>> - ctx->va_rc_mode = VA_RC_CQP;
>> -
>> ctx->input_width = avctx->width;
>> ctx->input_height = avctx->height;
>> ctx->aligned_width = FFALIGN(ctx->input_width, 16);
>> @@ -754,30 +766,69 @@ static av_cold int
>> vaapi_encode_h264_init_internal(AVCodecContext *avctx)
>> priv->mb_width = ctx->aligned_width / 16;
>> priv->mb_height = ctx->aligned_height / 16;
>>
>> - if (avctx->bit_rate > 0) {
>> - av_log(avctx, AV_LOG_ERROR, "Constant bitrate encoding is not "
>> - "supported!\n");
>> - return AVERROR_PATCHWELCOME;
>> - }
>> -
>> for (i = 0; i < FF_ARRAY_ELEMS(default_config_attributes); i++) {
>> ctx->config_attributes[ctx->nb_config_attributes++] =
>> default_config_attributes[i];
>> }
>>
>> - priv->fixed_qp_p = avctx->global_quality;
>> - if (avctx->i_quant_factor > 0.0)
>> - priv->fixed_qp_idr = (int)((priv->fixed_qp_p *
>> avctx->i_quant_factor +
>> - avctx->i_quant_offset) + 0.5);
>> - else
>> - priv->fixed_qp_idr = priv->fixed_qp_p;
>> - if (avctx->b_quant_factor > 0.0)
>> - priv->fixed_qp_b = (int)((priv->fixed_qp_p * avctx->b_quant_factor +
>> - avctx->b_quant_offset) + 0.5);
>> - else
>> - priv->fixed_qp_b = priv->fixed_qp_p;
>> - av_log(avctx, AV_LOG_DEBUG, "QP = %d / %d / %d for IDR / P / B
>> frames.\n",
>> - priv->fixed_qp_idr, priv->fixed_qp_p, priv->fixed_qp_b);
>> + if (avctx->bit_rate > 0) {
>
> Strictly speaking, it should be CBR only if maxrate and minrate are also
> set and equal to the bitrate. Otherwise it should be VBR with the given
> average bitrate.
Thats what we call ABR. VBR generally has no bitrate hints but a
quality metric of some sort.
>> + ctx->va_rc_mode = VA_RC_CBR;
>> +
>> + priv->rc_params.misc.type = VAEncMiscParameterTypeRateControl;
>> + priv->rc_params.rc = (VAEncMiscParameterRateControl) {
>> + .bits_per_second = avctx->bit_rate,
>> + .target_percentage = 66,
>> + .window_size = 1000,
>> + .initial_qp = (avctx->qmax >= 0 ? avctx->qmax : 40),
>> + .min_qp = (avctx->qmin >= 0 ? avctx->qmin : 18),
>> + .basic_unit_size = 0,
>> + };
>> + ctx->global_params[ctx->nb_global_params] =
>> + &priv->rc_params.misc;
>> + ctx->global_params_size[ctx->nb_global_params++] =
>> + sizeof(priv->rc_params);
>> +
>> + priv->hrd_params.misc.type = VAEncMiscParameterTypeHRD;
>> + priv->hrd_params.hrd = (VAEncMiscParameterHRD) {
>> + .initial_buffer_fullness = avctx->bit_rate,
>
> rc_initial_buffer_occupancy?
>
>> + .buffer_size = avctx->bit_rate * 2,
>
> rc_buffer_size?
>
> --
> Anton Khirnov
> _______________________________________________
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> libav-devel@libav.org
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