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Diffstat (limited to 'media/libvpx/vp9/encoder/vp9_lookahead.h')
| -rw-r--r-- | media/libvpx/vp9/encoder/vp9_lookahead.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/media/libvpx/vp9/encoder/vp9_lookahead.h b/media/libvpx/vp9/encoder/vp9_lookahead.h new file mode 100644 index 000000000..13820380f --- /dev/null +++ b/media/libvpx/vp9/encoder/vp9_lookahead.h @@ -0,0 +1,124 @@ +/* + * Copyright (c) 2011 The WebM project authors. All Rights Reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef VP9_ENCODER_VP9_LOOKAHEAD_H_ +#define VP9_ENCODER_VP9_LOOKAHEAD_H_ + +#include "vpx_scale/yv12config.h" +#include "vpx/vpx_integer.h" + +#if CONFIG_SPATIAL_SVC +#include "vpx/vp8cx.h" +#include "vpx/vpx_encoder.h" +#endif + +#ifdef __cplusplus +extern "C" { +#endif + +#define MAX_LAG_BUFFERS 25 + +struct lookahead_entry { + YV12_BUFFER_CONFIG img; + int64_t ts_start; + int64_t ts_end; + unsigned int flags; +}; + +// The max of past frames we want to keep in the queue. +#define MAX_PRE_FRAMES 1 + +struct lookahead_ctx { + unsigned int max_sz; /* Absolute size of the queue */ + unsigned int sz; /* Number of buffers currently in the queue */ + unsigned int read_idx; /* Read index */ + unsigned int write_idx; /* Write index */ + struct lookahead_entry *buf; /* Buffer list */ +}; + +/**\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 *vp9_lookahead_init(unsigned int width, + unsigned int height, + unsigned int subsampling_x, + unsigned int subsampling_y, +#if CONFIG_VP9_HIGHBITDEPTH + int use_highbitdepth, +#endif + unsigned int depth); + + +/**\brief Destroys the lookahead stage + */ +void vp9_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] flags Flags set on this frame + * \param[in] active_map Map that specifies which macroblock is active + */ +int vp9_lookahead_push(struct lookahead_ctx *ctx, YV12_BUFFER_CONFIG *src, + int64_t ts_start, int64_t ts_end, +#if CONFIG_VP9_HIGHBITDEPTH + int use_highbitdepth, +#endif + unsigned int 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) + * + * \retval NULL, if drain set and queue is empty + * \retval NULL, if drain not set and queue not of the configured depth + */ +struct lookahead_entry *vp9_lookahead_pop(struct lookahead_ctx *ctx, + int drain); + + +/**\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 + * + * \retval NULL, if no buffer exists at the specified index + */ +struct lookahead_entry *vp9_lookahead_peek(struct lookahead_ctx *ctx, + int index); + + +/**\brief Get the number of frames currently in the lookahead queue + * + * \param[in] ctx Pointer to the lookahead context + */ +unsigned int vp9_lookahead_depth(struct lookahead_ctx *ctx); + +#ifdef __cplusplus +} // extern "C" +#endif + +#endif // VP9_ENCODER_VP9_LOOKAHEAD_H_ |