| /* |
| * Copyright (c) 2021, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 3-Clause Clear License |
| * and the Alliance for Open Media Patent License 1.0. If the BSD 3-Clause Clear |
| * License was not distributed with this source code in the LICENSE file, you |
| * can obtain it at aomedia.org/license/software-license/bsd-3-c-c/. 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 |
| * aomedia.org/license/patent-license/. |
| */ |
| |
| /*!\file |
| * \brief Describes look ahead buffer operations. |
| */ |
| #ifndef AOM_AV1_ENCODER_LOOKAHEAD_H_ |
| #define AOM_AV1_ENCODER_LOOKAHEAD_H_ |
| |
| #include "aom_scale/yv12config.h" |
| #include "aom/aom_integer.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /*!\cond */ |
| #define MAX_LAG_BUFFERS 35 |
| #define MAX_LAP_BUFFERS 35 |
| #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; |
| 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 */ |
| }; |
| /*!\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, unsigned int depth, const int border_in_pixels, |
| int byte_alignment, int num_lap_buffers, int num_pyramid_levels); |
| |
| /**\brief Destroys the lookahead stage |
| */ |
| void av1_lookahead_destroy(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. |
| * |
| * If active_map is non-NULL and there is only one frame in the queue, then copy |
| * only active macroblocks. |
| * |
| * \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] 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 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_ |