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comparison: media/libvpx/vp9/encoder/vp9_lookahead.h
media/libvpx/vp9/encoder/vp9_lookahead.h
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| 1 /* | |
| 2 * Copyright (c) 2011 The WebM project authors. All Rights Reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 #ifndef VP9_ENCODER_VP9_LOOKAHEAD_H_ | |
| 12 #define VP9_ENCODER_VP9_LOOKAHEAD_H_ | |
| 13 | |
| 14 #include "vpx_scale/yv12config.h" | |
| 15 #include "vpx/vpx_integer.h" | |
| 16 | |
| 17 #define MAX_LAG_BUFFERS 25 | |
| 18 | |
| 19 struct lookahead_entry { | |
| 20 YV12_BUFFER_CONFIG img; | |
| 21 int64_t ts_start; | |
| 22 int64_t ts_end; | |
| 23 unsigned int flags; | |
| 24 }; | |
| 25 | |
| 26 | |
| 27 struct lookahead_ctx; | |
| 28 | |
| 29 /**\brief Initializes the lookahead stage | |
| 30 * | |
| 31 * The lookahead stage is a queue of frame buffers on which some analysis | |
| 32 * may be done when buffers are enqueued. | |
| 33 */ | |
| 34 struct lookahead_ctx *vp9_lookahead_init(unsigned int width, | |
| 35 unsigned int height, | |
| 36 unsigned int subsampling_x, | |
| 37 unsigned int subsampling_y, | |
| 38 unsigned int depth); | |
| 39 | |
| 40 | |
| 41 /**\brief Destroys the lookahead stage | |
| 42 */ | |
| 43 void vp9_lookahead_destroy(struct lookahead_ctx *ctx); | |
| 44 | |
| 45 | |
| 46 /**\brief Enqueue a source buffer | |
| 47 * | |
| 48 * This function will copy the source image into a new framebuffer with | |
| 49 * the expected stride/border. | |
| 50 * | |
| 51 * If active_map is non-NULL and there is only one frame in the queue, then copy | |
| 52 * only active macroblocks. | |
| 53 * | |
| 54 * \param[in] ctx Pointer to the lookahead context | |
| 55 * \param[in] src Pointer to the image to enqueue | |
| 56 * \param[in] ts_start Timestamp for the start of this frame | |
| 57 * \param[in] ts_end Timestamp for the end of this frame | |
| 58 * \param[in] flags Flags set on this frame | |
| 59 * \param[in] active_map Map that specifies which macroblock is active | |
| 60 */ | |
| 61 int vp9_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src, | |
| 62 int64_t ts_start, int64_t ts_end, unsigned int flags, | |
| 63 unsigned char *active_map); | |
| 64 | |
| 65 | |
| 66 /**\brief Get the next source buffer to encode | |
| 67 * | |
| 68 * | |
| 69 * \param[in] ctx Pointer to the lookahead context | |
| 70 * \param[in] drain Flag indicating the buffer should be drained | |
| 71 * (return a buffer regardless of the current queue depth) | |
| 72 * | |
| 73 * \retval NULL, if drain set and queue is empty | |
| 74 * \retval NULL, if drain not set and queue not of the configured depth | |
| 75 */ | |
| 76 struct lookahead_entry *vp9_lookahead_pop(struct lookahead_ctx *ctx, | |
| 77 int drain); | |
| 78 | |
| 79 | |
| 80 /**\brief Get a future source buffer to encode | |
| 81 * | |
| 82 * \param[in] ctx Pointer to the lookahead context | |
| 83 * \param[in] index Index of the frame to be returned, 0 == next frame | |
| 84 * | |
| 85 * \retval NULL, if no buffer exists at the specified index | |
| 86 */ | |
| 87 struct lookahead_entry *vp9_lookahead_peek(struct lookahead_ctx *ctx, | |
| 88 int index); | |
| 89 | |
| 90 | |
| 91 /**\brief Get the number of frames currently in the lookahead queue | |
| 92 * | |
| 93 * \param[in] ctx Pointer to the lookahead context | |
| 94 */ | |
| 95 unsigned int vp9_lookahead_depth(struct lookahead_ctx *ctx); | |
| 96 | |
| 97 #endif // VP9_ENCODER_VP9_LOOKAHEAD_H_ |
