diff options
Diffstat (limited to 'vp8/encoder/ratectrl.c')
| -rw-r--r-- | vp8/encoder/ratectrl.c | 77 |
1 files changed, 56 insertions, 21 deletions
diff --git a/vp8/encoder/ratectrl.c b/vp8/encoder/ratectrl.c index 0a5f3bff1..a2f0e7a26 100644 --- a/vp8/encoder/ratectrl.c +++ b/vp8/encoder/ratectrl.c @@ -887,7 +887,8 @@ void vp8_calc_pframe_target_size(VP8_COMP *cpi) { int one_percent_bits = 1 + cpi->oxcf.optimal_buffer_level / 100; - if ((cpi->buffer_level < cpi->oxcf.optimal_buffer_level) || (cpi->bits_off_target < cpi->oxcf.optimal_buffer_level)) + if ((cpi->buffer_level < cpi->oxcf.optimal_buffer_level) || + (cpi->bits_off_target < cpi->oxcf.optimal_buffer_level)) { int percent_low = 0; @@ -896,9 +897,12 @@ void vp8_calc_pframe_target_size(VP8_COMP *cpi) // If we are are below the optimal buffer fullness level and adherence // to buffering contraints is important to the end useage then adjust // the per frame target. - if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) && (cpi->buffer_level < cpi->oxcf.optimal_buffer_level)) + if ((cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) && + (cpi->buffer_level < cpi->oxcf.optimal_buffer_level)) { - percent_low = (cpi->oxcf.optimal_buffer_level - cpi->buffer_level) / one_percent_bits; + percent_low = + (cpi->oxcf.optimal_buffer_level - cpi->buffer_level) / + one_percent_bits; if (percent_low > 100) percent_low = 100; @@ -909,7 +913,8 @@ void vp8_calc_pframe_target_size(VP8_COMP *cpi) else if (cpi->bits_off_target < 0) { // Adjust per frame data target downwards to compensate. - percent_low = (int)(100 * -cpi->bits_off_target / (cpi->total_byte_count * 8)); + percent_low = (int)(100 * -cpi->bits_off_target / + (cpi->total_byte_count * 8)); if (percent_low > 100) percent_low = 100; @@ -918,39 +923,60 @@ void vp8_calc_pframe_target_size(VP8_COMP *cpi) } // lower the target bandwidth for this frame. - cpi->this_frame_target = (cpi->this_frame_target * (100 - (percent_low / 2))) / 100; + cpi->this_frame_target = + (cpi->this_frame_target * (100 - (percent_low / 2))) / 100; - // Are we using allowing control of active_worst_allowed_q according to buffer level. + // Are we using allowing control of active_worst_allowed_q + // according to buffer level. if (cpi->auto_worst_q) { int critical_buffer_level; - // For streaming applications the most important factor is cpi->buffer_level as this takes - // into account the specified short term buffering constraints. However, hitting the long - // term clip data rate target is also important. + // For streaming applications the most important factor is + // cpi->buffer_level as this takes into account the + // specified short term buffering constraints. However, + // hitting the long term clip data rate target is also + // important. if (cpi->oxcf.end_usage == USAGE_STREAM_FROM_SERVER) { - // Take the smaller of cpi->buffer_level and cpi->bits_off_target - critical_buffer_level = (cpi->buffer_level < cpi->bits_off_target) ? cpi->buffer_level : cpi->bits_off_target; + // Take the smaller of cpi->buffer_level and + // cpi->bits_off_target + critical_buffer_level = + (cpi->buffer_level < cpi->bits_off_target) + ? cpi->buffer_level : cpi->bits_off_target; } - // For local file playback short term buffering contraints are less of an issue + // For local file playback short term buffering contraints + // are less of an issue else { - // Consider only how we are doing for the clip as a whole + // Consider only how we are doing for the clip as a + // whole critical_buffer_level = cpi->bits_off_target; } - // Set the active worst quality based upon the selected buffer fullness number. + // Set the active worst quality based upon the selected + // buffer fullness number. if (critical_buffer_level < cpi->oxcf.optimal_buffer_level) { - if (critical_buffer_level > (cpi->oxcf.optimal_buffer_level / 4)) + if ( critical_buffer_level > + (cpi->oxcf.optimal_buffer_level >> 2) ) { - int qadjustment_range = cpi->worst_quality - cpi->ni_av_qi; - int above_base = (critical_buffer_level - (cpi->oxcf.optimal_buffer_level / 4)); - - // Step active worst quality down from cpi->ni_av_qi when (critical_buffer_level == cpi->optimal_buffer_level) - // to cpi->oxcf.worst_allowed_q when (critical_buffer_level == cpi->optimal_buffer_level/4) - cpi->active_worst_quality = cpi->worst_quality - ((qadjustment_range * above_base) / (cpi->oxcf.optimal_buffer_level * 3 / 4)); + INT64 qadjustment_range = + cpi->worst_quality - cpi->ni_av_qi; + INT64 above_base = + (critical_buffer_level - + (cpi->oxcf.optimal_buffer_level >> 2)); + + // Step active worst quality down from + // cpi->ni_av_qi when (critical_buffer_level == + // cpi->optimal_buffer_level) to + // cpi->worst_quality when + // (critical_buffer_level == + // cpi->optimal_buffer_level >> 2) + cpi->active_worst_quality = + cpi->worst_quality - + ((qadjustment_range * above_base) / + (cpi->oxcf.optimal_buffer_level*3>>2)); } else { @@ -1010,6 +1036,15 @@ void vp8_calc_pframe_target_size(VP8_COMP *cpi) // Set the active worst quality cpi->active_worst_quality = cpi->worst_quality; } + + // Special trap for constrained quality mode + // "active_worst_quality" may never drop below cq level + // for any frame type. + if ( cpi->oxcf.end_usage == USAGE_CONSTRAINED_QUALITY && + cpi->active_worst_quality < cpi->cq_target_quality) + { + cpi->active_worst_quality = cpi->cq_target_quality; + } } // Test to see if we have to drop a frame |