diff options
Diffstat (limited to 'vp9/encoder/vp9_ratectrl.c')
| -rw-r--r-- | vp9/encoder/vp9_ratectrl.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/vp9/encoder/vp9_ratectrl.c b/vp9/encoder/vp9_ratectrl.c index b1ef08291..bd6a78c2d 100644 --- a/vp9/encoder/vp9_ratectrl.c +++ b/vp9/encoder/vp9_ratectrl.c @@ -27,6 +27,11 @@ #include "vp9/encoder/vp9_encodemv.h" #include "vp9/encoder/vp9_ratectrl.h" +// Max rate target for 1080P and below encodes under normal circumstances +// (1920 * 1080 / (16 * 16)) * MAX_MB_RATE bits per MB +#define MAX_MB_RATE 250 +#define MAXRATE_1080P 2025000 + #define DEFAULT_KF_BOOST 2000 #define DEFAULT_GF_BOOST 2000 @@ -1399,3 +1404,46 @@ int vp9_compute_qdelta_by_rate(const RATE_CONTROL *rc, FRAME_TYPE frame_type, return target_index - qindex; } + +void vp9_rc_update_framerate(VP9_COMP *cpi) { + const VP9_COMMON *const cm = &cpi->common; + const VP9_CONFIG *const oxcf = &cpi->oxcf; + RATE_CONTROL *const rc = &cpi->rc; + int vbr_max_bits; + + rc->av_per_frame_bandwidth = (int)(oxcf->target_bandwidth / oxcf->framerate); + rc->min_frame_bandwidth = (int)(rc->av_per_frame_bandwidth * + oxcf->two_pass_vbrmin_section / 100); + + rc->min_frame_bandwidth = MAX(rc->min_frame_bandwidth, FRAME_OVERHEAD_BITS); + + // A maximum bitrate for a frame is defined. + // The baseline for this aligns with HW implementations that + // can support decode of 1080P content up to a bitrate of MAX_MB_RATE bits + // per 16x16 MB (averaged over a frame). However this limit is extended if + // a very high rate is given on the command line or the the rate cannnot + // be acheived because of a user specificed max q (e.g. when the user + // specifies lossless encode. + vbr_max_bits = (int)(((int64_t)rc->av_per_frame_bandwidth * + oxcf->two_pass_vbrmax_section) / 100); + rc->max_frame_bandwidth = MAX(MAX((cm->MBs * MAX_MB_RATE), MAXRATE_1080P), + vbr_max_bits); + + // Set Maximum gf/arf interval + rc->max_gf_interval = 16; + + // Extended interval for genuinely static scenes + rc->static_scene_max_gf_interval = cpi->key_frame_frequency >> 1; + + // Special conditions when alt ref frame enabled in lagged compress mode + if (oxcf->play_alternate && oxcf->lag_in_frames) { + if (rc->max_gf_interval > oxcf->lag_in_frames - 1) + rc->max_gf_interval = oxcf->lag_in_frames - 1; + + if (rc->static_scene_max_gf_interval > oxcf->lag_in_frames - 1) + rc->static_scene_max_gf_interval = oxcf->lag_in_frames - 1; + } + + if (rc->max_gf_interval > rc->static_scene_max_gf_interval) + rc->max_gf_interval = rc->static_scene_max_gf_interval; +} |