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Diffstat (limited to 'third_party/aom/av1/encoder/lookahead.h')
| -rw-r--r-- | third_party/aom/av1/encoder/lookahead.h | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/third_party/aom/av1/encoder/lookahead.h b/third_party/aom/av1/encoder/lookahead.h new file mode 100644 index 0000000000..c0e6d222f5 --- /dev/null +++ b/third_party/aom/av1/encoder/lookahead.h @@ -0,0 +1,138 @@ +/* + * Copyright (c) 2016, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ + +/*!\file + * \brief Describes look ahead buffer operations. + */ +#ifndef AOM_AV1_ENCODER_LOOKAHEAD_H_ +#define AOM_AV1_ENCODER_LOOKAHEAD_H_ + +#include <stdbool.h> + +#include "aom_scale/yv12config.h" +#include "aom/aom_integer.h" + +#ifdef __cplusplus +extern "C" { +#endif + +/*!\cond */ +#define MAX_LAG_BUFFERS 48 +#define MAX_LAP_BUFFERS 48 +#define MAX_TOTAL_BUFFERS (MAX_LAG_BUFFERS + MAX_LAP_BUFFERS) +#define LAP_LAG_IN_FRAMES 17 + +struct lookahead_entry { + YV12_BUFFER_CONFIG img; + int64_t ts_start; + int64_t ts_end; + int display_idx; + aom_enc_frame_flags_t flags; +}; + +// The max of past frames we want to keep in the queue. +#define MAX_PRE_FRAMES 1 + +enum { ENCODE_STAGE, LAP_STAGE, MAX_STAGES } UENUM1BYTE(COMPRESSOR_STAGE); + +struct read_ctx { + int sz; /* Number of buffers currently in the queue */ + int read_idx; /* Read index */ + int pop_sz; /* Size to check for pop condition */ + int valid; /* Is this ctx valid? */ +}; + +struct lookahead_ctx { + int max_sz; /* Absolute size of the queue */ + int write_idx; /* Write index */ + struct read_ctx read_ctxs[MAX_STAGES]; /* Read context */ + struct lookahead_entry *buf; /* Buffer list */ + int push_frame_count; /* Number of frames that have been pushed in the queue*/ + uint8_t + max_pre_frames; /* Maximum number of past frames allowed in the queue */ +}; +/*!\endcond */ + +/**\brief Initializes the lookahead stage + * + * The lookahead stage is a queue of frame buffers on which some analysis + * may be done when buffers are enqueued. + */ +struct lookahead_ctx *av1_lookahead_init( + unsigned int width, unsigned int height, unsigned int subsampling_x, + unsigned int subsampling_y, int use_highbitdepth, unsigned int depth, + const int border_in_pixels, int byte_alignment, int num_lap_buffers, + bool is_all_intra, int num_pyramid_levels); + +/**\brief Destroys the lookahead stage + */ +void av1_lookahead_destroy(struct lookahead_ctx *ctx); + +/**\brief Check if lookahead buffer is full + */ +int av1_lookahead_full(const struct lookahead_ctx *ctx); + +/**\brief Enqueue a source buffer + * + * This function will copy the source image into a new framebuffer with + * the expected stride/border. + * + * \param[in] ctx Pointer to the lookahead context + * \param[in] src Pointer to the image to enqueue + * \param[in] ts_start Timestamp for the start of this frame + * \param[in] ts_end Timestamp for the end of this frame + * \param[in] use_highbitdepth Tell if HBD is used + * \param[in] num_pyramid_levels Number of pyramid levels to allocate + for each frame buffer + * \param[in] flags Flags set on this frame + */ +int av1_lookahead_push(struct lookahead_ctx *ctx, const YV12_BUFFER_CONFIG *src, + int64_t ts_start, int64_t ts_end, int use_highbitdepth, + int num_pyramid_levels, aom_enc_frame_flags_t flags); + +/**\brief Get the next source buffer to encode + * + * \param[in] ctx Pointer to the lookahead context + * \param[in] drain Flag indicating the buffer should be drained + * (return a buffer regardless of the current queue depth) + * \param[in] stage Encoder stage + * + * \retval Return NULL, if drain set and queue is empty, or if drain not set and + * queue not of the configured depth. + */ +struct lookahead_entry *av1_lookahead_pop(struct lookahead_ctx *ctx, int drain, + COMPRESSOR_STAGE stage); + +/**\brief Get a future source buffer to encode + * + * \param[in] ctx Pointer to the lookahead context + * \param[in] index Index of the frame to be returned, 0 == next frame + * \param[in] stage Encoder stage + * + * \retval Return NULL, if no buffer exists at the specified index + */ +struct lookahead_entry *av1_lookahead_peek(struct lookahead_ctx *ctx, int index, + COMPRESSOR_STAGE stage); + +/**\brief Get the number of frames currently in the lookahead queue + */ +unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx, + COMPRESSOR_STAGE stage); + +/**\brief Get pop_sz value + */ +int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage); + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif // AOM_AV1_ENCODER_LOOKAHEAD_H_ |