1 /* 2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved 3 * 4 * This source code is subject to the terms of the BSD 2 Clause License and 5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License 6 * was not distributed with this source code in the LICENSE file, you can 7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open 8 * Media Patent License 1.0 was not distributed with this source code in the 9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent. 10 */ 11 12 /*!\file 13 * \brief Describes look ahead buffer operations. 14 */ 15 #ifndef AOM_AV1_ENCODER_LOOKAHEAD_H_ 16 #define AOM_AV1_ENCODER_LOOKAHEAD_H_ 17 18 #include "aom_scale/yv12config.h" 19 #include "aom/aom_integer.h" 20 21 #ifdef __cplusplus 22 extern "C" { 23 #endif 24 25 /*!\cond */ 26 #define MAX_LAG_BUFFERS 35 27 #define MAX_LAP_BUFFERS 35 28 #define MAX_TOTAL_BUFFERS (MAX_LAG_BUFFERS + MAX_LAP_BUFFERS) 29 #define LAP_LAG_IN_FRAMES 17 30 31 struct lookahead_entry { 32 YV12_BUFFER_CONFIG img; 33 int64_t ts_start; 34 int64_t ts_end; 35 int display_idx; 36 aom_enc_frame_flags_t flags; 37 }; 38 39 // The max of past frames we want to keep in the queue. 40 #define MAX_PRE_FRAMES 1 41 42 enum { ENCODE_STAGE, LAP_STAGE, MAX_STAGES } UENUM1BYTE(COMPRESSOR_STAGE); 43 44 struct read_ctx { 45 int sz; /* Number of buffers currently in the queue */ 46 int read_idx; /* Read index */ 47 int pop_sz; /* Size to check for pop condition */ 48 int valid; /* Is this ctx valid? */ 49 }; 50 51 struct lookahead_ctx { 52 int max_sz; /* Absolute size of the queue */ 53 int write_idx; /* Write index */ 54 struct read_ctx read_ctxs[MAX_STAGES]; /* Read context */ 55 struct lookahead_entry *buf; /* Buffer list */ 56 int push_frame_count; /* Number of frames has been pushed in the queue*/ 57 }; 58 /*!\endcond */ 59 60 /**\brief Initializes the lookahead stage 61 * 62 * The lookahead stage is a queue of frame buffers on which some analysis 63 * may be done when buffers are enqueued. 64 */ 65 struct lookahead_ctx *av1_lookahead_init( 66 unsigned int width, unsigned int height, unsigned int subsampling_x, 67 unsigned int subsampling_y, int use_highbitdepth, unsigned int depth, 68 const int border_in_pixels, int byte_alignment, int num_lap_buffers); 69 70 /**\brief Destroys the lookahead stage 71 */ 72 void av1_lookahead_destroy(struct lookahead_ctx *ctx); 73 74 /**\brief Enqueue a source buffer 75 * 76 * This function will copy the source image into a new framebuffer with 77 * the expected stride/border. 78 * 79 * If active_map is non-NULL and there is only one frame in the queue, then copy 80 * only active macroblocks. 81 * 82 * \param[in] ctx Pointer to the lookahead context 83 * \param[in] src Pointer to the image to enqueue 84 * \param[in] ts_start Timestamp for the start of this frame 85 * \param[in] ts_end Timestamp for the end of this frame 86 * \param[in] use_highbitdepth Tell if HBD is used 87 * \param[in] flags Flags set on this frame 88 */ 89 int av1_lookahead_push(struct lookahead_ctx *ctx, const YV12_BUFFER_CONFIG *src, 90 int64_t ts_start, int64_t ts_end, int use_highbitdepth, 91 aom_enc_frame_flags_t flags); 92 93 /**\brief Get the next source buffer to encode 94 * 95 * \param[in] ctx Pointer to the lookahead context 96 * \param[in] drain Flag indicating the buffer should be drained 97 * (return a buffer regardless of the current queue depth) 98 * \param[in] stage Encoder stage 99 * 100 * \retval Return NULL, if drain set and queue is empty, or if drain not set and 101 * queue not of the configured depth. 102 */ 103 struct lookahead_entry *av1_lookahead_pop(struct lookahead_ctx *ctx, int drain, 104 COMPRESSOR_STAGE stage); 105 106 /**\brief Get a future source buffer to encode 107 * 108 * \param[in] ctx Pointer to the lookahead context 109 * \param[in] index Index of the frame to be returned, 0 == next frame 110 * \param[in] stage Encoder stage 111 * 112 * \retval Return NULL, if no buffer exists at the specified index 113 */ 114 struct lookahead_entry *av1_lookahead_peek(struct lookahead_ctx *ctx, int index, 115 COMPRESSOR_STAGE stage); 116 117 /**\brief Get the number of frames currently in the lookahead queue 118 */ 119 unsigned int av1_lookahead_depth(struct lookahead_ctx *ctx, 120 COMPRESSOR_STAGE stage); 121 122 /**\brief Get pop_sz value 123 */ 124 int av1_lookahead_pop_sz(struct lookahead_ctx *ctx, COMPRESSOR_STAGE stage); 125 126 #ifdef __cplusplus 127 } // extern "C" 128 #endif 129 130 #endif // AOM_AV1_ENCODER_LOOKAHEAD_H_ 131