Commit 8c196b27 authored by Minghai Shang's avatar Minghai Shang
Browse files

[svc] Add target bitrate settings for each layers.

Change-Id: Ia7677fb436667bc4f76db71f65e4784f433f7826
parent c79bd22a
......@@ -1265,6 +1265,7 @@ static vpx_codec_enc_cfg_map_t vp8e_usage_cfg_map[] =
"vp8.fpf" /* first pass filename */
#endif
VPX_SS_DEFAULT_LAYERS, /* ss_number_layers */
{0}, /* ss_target_bitrate */
1, /* ts_number_layers */
{0}, /* ts_target_bitrate */
{0}, /* ts_rate_decimator */
......
......@@ -149,6 +149,8 @@ extern "C" {
// Spatial and temporal scalability.
int ss_number_layers; // Number of spatial layers.
int ts_number_layers; // Number of temporal layers.
// Bitrate allocation for spatial layers.
int ss_target_bitrate[VPX_SS_MAX_LAYERS];
// Bitrate allocation (CBR mode) and framerate factor, for temporal layers.
int ts_target_bitrate[VPX_TS_MAX_LAYERS];
int ts_rate_decimator[VPX_TS_MAX_LAYERS];
......
......@@ -355,6 +355,13 @@ static vpx_codec_err_t set_vp9e_config(VP9_CONFIG *oxcf,
oxcf->ss_number_layers = cfg.ss_number_layers;
if (oxcf->ss_number_layers > 1) {
memcpy(oxcf->ss_target_bitrate, cfg.ss_target_bitrate,
sizeof(cfg.ss_target_bitrate));
} else if (oxcf->ss_number_layers == 1) {
oxcf->ss_target_bitrate[0] = oxcf->target_bandwidth;
}
oxcf->ts_number_layers = cfg.ts_number_layers;
if (oxcf->ts_number_layers > 1) {
......@@ -1160,6 +1167,7 @@ static vpx_codec_enc_cfg_map_t vp9e_usage_cfg_map[] = {
9999, /* kf_max_dist */
VPX_SS_DEFAULT_LAYERS, /* ss_number_layers */
{0}, /* ss_target_bitrate */
1, /* ts_number_layers */
{0}, /* ts_target_bitrate */
{0}, /* ts_rate_decimator */
......
......@@ -534,6 +534,29 @@ vpx_codec_err_t vpx_svc_init(SvcContext *svc_ctx, vpx_codec_ctx_t *codec_ctx,
res = parse_options(svc_ctx, si->options);
if (res != VPX_CODEC_OK) return res;
// Assign target bitrate for each layer. We calculate the ratio
// from the resolution for now.
// TODO(Minghai): Optimize the mechanism of allocating bits after
// implementing svc two pass rate control.
if (si->layers > 1) {
int i;
float total = 0;
float alloc_ratio[VPX_SS_MAX_LAYERS] = {0};
for (i = 0; i < si->layers; ++i) {
int pos = i + VPX_SS_MAX_LAYERS - svc_ctx->spatial_layers;
alloc_ratio[i] = si->scaling_factor_num[pos] * 1.0 /
si->scaling_factor_den[pos];
alloc_ratio[i] *= alloc_ratio[i];
total += alloc_ratio[i];
}
for (i = 0; i < si->layers; ++i) {
enc_cfg->ss_target_bitrate[i] = enc_cfg->rc_target_bitrate *
alloc_ratio[i] / total;
}
}
// modify encoder configuration
enc_cfg->ss_number_layers = si->layers;
enc_cfg->ts_number_layers = 1; // Temporal layers not used in this encoder.
......
......@@ -610,6 +610,13 @@ extern "C" {
*/
unsigned int ss_number_layers;
/*!\brief Target bitrate for each spatial layer.
*
* These values specify the target coding bitrate to be used for each
* spatial layer.
*/
unsigned int ss_target_bitrate[VPX_SS_MAX_LAYERS];
/*!\brief Number of temporal coding layers.
*
* This value specifies the number of temporal layers to be used.
......
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