ref: 8b7a6ca60a47f23d85dd07bbe19c93ea7cd31a33
dir: /vp8/vp8_dx_iface.c/
/*
* Copyright (c) 2010 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.
*/
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "./vp8_rtcd.h"
#include "./vpx_dsp_rtcd.h"
#include "./vpx_scale_rtcd.h"
#include "vpx/vpx_decoder.h"
#include "vpx/vp8dx.h"
#include "vpx/internal/vpx_codec_internal.h"
#include "vpx_version.h"
#include "common/alloccommon.h"
#include "common/common.h"
#include "common/onyxd.h"
#include "decoder/onyxd_int.h"
#include "vpx_dsp/vpx_dsp_common.h"
#include "vpx_mem/vpx_mem.h"
#include "vpx_ports/system_state.h"
#if CONFIG_ERROR_CONCEALMENT
#include "decoder/error_concealment.h"
#endif
#include "decoder/decoderthreading.h"
#define VP8_CAP_POSTPROC (CONFIG_POSTPROC ? VPX_CODEC_CAP_POSTPROC : 0)
#define VP8_CAP_ERROR_CONCEALMENT \
(CONFIG_ERROR_CONCEALMENT ? VPX_CODEC_CAP_ERROR_CONCEALMENT : 0)
typedef vpx_codec_stream_info_t vp8_stream_info_t;
/* Structures for handling memory allocations */
typedef enum { VP8_SEG_ALG_PRIV = 256, VP8_SEG_MAX } mem_seg_id_t;
#define NELEMENTS(x) ((int)(sizeof(x) / sizeof(x[0])))
struct vpx_codec_alg_priv {
vpx_codec_priv_t base;
vpx_codec_dec_cfg_t cfg;
vp8_stream_info_t si;
int decoder_init;
int postproc_cfg_set;
vp8_postproc_cfg_t postproc_cfg;
vpx_decrypt_cb decrypt_cb;
void *decrypt_state;
vpx_image_t img;
int img_setup;
struct frame_buffers yv12_frame_buffers;
void *user_priv;
FRAGMENT_DATA fragments;
};
static int vp8_init_ctx(vpx_codec_ctx_t *ctx) {
vpx_codec_alg_priv_t *priv =
(vpx_codec_alg_priv_t *)vpx_calloc(1, sizeof(*priv));
if (!priv) return 1;
ctx->priv = (vpx_codec_priv_t *)priv;
ctx->priv->init_flags = ctx->init_flags;
priv->si.sz = sizeof(priv->si);
priv->decrypt_cb = NULL;
priv->decrypt_state = NULL;
if (ctx->config.dec) {
/* Update the reference to the config structure to an internal copy. */
priv->cfg = *ctx->config.dec;
ctx->config.dec = &priv->cfg;
}
return 0;
}
static vpx_codec_err_t vp8_init(vpx_codec_ctx_t *ctx,
vpx_codec_priv_enc_mr_cfg_t *data) {
vpx_codec_err_t res = VPX_CODEC_OK;
(void)data;
vp8_rtcd();
vpx_dsp_rtcd();
vpx_scale_rtcd();
/* This function only allocates space for the vpx_codec_alg_priv_t
* structure. More memory may be required at the time the stream
* information becomes known.
*/
if (!ctx->priv) {
vpx_codec_alg_priv_t *priv;
if (vp8_init_ctx(ctx)) return VPX_CODEC_MEM_ERROR;
priv = (vpx_codec_alg_priv_t *)ctx->priv;
/* initialize number of fragments to zero */
priv->fragments.count = 0;
/* is input fragments enabled? */
priv->fragments.enabled =
(priv->base.init_flags & VPX_CODEC_USE_INPUT_FRAGMENTS);
/*post processing level initialized to do nothing */
}
return res;
}
static vpx_codec_err_t vp8_destroy(vpx_codec_alg_priv_t *ctx) {
vp8_remove_decoder_instances(&ctx->yv12_frame_buffers);
vpx_free(ctx);
return VPX_CODEC_OK;
}
static vpx_codec_err_t vp8_peek_si_internal(const uint8_t *data,
unsigned int data_sz,
vpx_codec_stream_info_t *si,
vpx_decrypt_cb decrypt_cb,
void *decrypt_state) {
vpx_codec_err_t res = VPX_CODEC_OK;
assert(data != NULL);
if (data + data_sz <= data) {
res = VPX_CODEC_INVALID_PARAM;
} else {
/* Parse uncompresssed part of key frame header.
* 3 bytes:- including version, frame type and an offset
* 3 bytes:- sync code (0x9d, 0x01, 0x2a)
* 4 bytes:- including image width and height in the lowest 14 bits
* of each 2-byte value.
*/
uint8_t clear_buffer[10];
const uint8_t *clear = data;
if (decrypt_cb) {
int n = VPXMIN(sizeof(clear_buffer), data_sz);
decrypt_cb(decrypt_state, data, clear_buffer, n);
clear = clear_buffer;
}
si->is_kf = 0;
if (data_sz >= 10 && !(clear[0] & 0x01)) { /* I-Frame */
si->is_kf = 1;
/* vet via sync code */
if (clear[3] != 0x9d || clear[4] != 0x01 || clear[5] != 0x2a) {
return VPX_CODEC_UNSUP_BITSTREAM;
}
si->w = (clear[6] | (clear[7] << 8)) & 0x3fff;
si->h = (clear[8] | (clear[9] << 8)) & 0x3fff;
/*printf("w=%d, h=%d\n", si->w, si->h);*/
if (!(si->h && si->w)) res = VPX_CODEC_CORRUPT_FRAME;
} else {
res = VPX_CODEC_UNSUP_BITSTREAM;
}
}
return res;
}
static vpx_codec_err_t vp8_peek_si(const uint8_t *data, unsigned int data_sz,
vpx_codec_stream_info_t *si) {
return vp8_peek_si_internal(data, data_sz, si, NULL, NULL);
}
static vpx_codec_err_t vp8_get_si(vpx_codec_alg_priv_t *ctx,
vpx_codec_stream_info_t *si) {
unsigned int sz;
if (si->sz >= sizeof(vp8_stream_info_t)) {
sz = sizeof(vp8_stream_info_t);
} else {
sz = sizeof(vpx_codec_stream_info_t);
}
memcpy(si, &ctx->si, sz);
si->sz = sz;
return VPX_CODEC_OK;
}
static vpx_codec_err_t update_error_state(
vpx_codec_alg_priv_t *ctx, const struct vpx_internal_error_info *error) {
vpx_codec_err_t res;
if ((res = error->error_code)) {
ctx->base.err_detail = error->has_detail ? error->detail : NULL;
}
return res;
}
static void yuvconfig2image(vpx_image_t *img, const YV12_BUFFER_CONFIG *yv12,
void *user_priv) {
/** vpx_img_wrap() doesn't allow specifying independent strides for
* the Y, U, and V planes, nor other alignment adjustments that
* might be representable by a YV12_BUFFER_CONFIG, so we just
* initialize all the fields.*/
img->fmt = VPX_IMG_FMT_I420;
img->w = yv12->y_stride;
img->h = (yv12->y_height + 2 * VP8BORDERINPIXELS + 15) & ~15;
img->d_w = img->r_w = yv12->y_width;
img->d_h = img->r_h = yv12->y_height;
img->x_chroma_shift = 1;
img->y_chroma_shift = 1;
img->planes[VPX_PLANE_Y] = yv12->y_buffer;
img->planes[VPX_PLANE_U] = yv12->u_buffer;
img->planes[VPX_PLANE_V] = yv12->v_buffer;
img->planes[VPX_PLANE_ALPHA] = NULL;
img->stride[VPX_PLANE_Y] = yv12->y_stride;
img->stride[VPX_PLANE_U] = yv12->uv_stride;
img->stride[VPX_PLANE_V] = yv12->uv_stride;
img->stride[VPX_PLANE_ALPHA] = yv12->y_stride;
img->bit_depth = 8;
img->bps = 12;
img->user_priv = user_priv;
img->img_data = yv12->buffer_alloc;
img->img_data_owner = 0;
img->self_allocd = 0;
}
static int update_fragments(vpx_codec_alg_priv_t *ctx, const uint8_t *data,
unsigned int data_sz,
volatile vpx_codec_err_t *res) {
*res = VPX_CODEC_OK;
if (ctx->fragments.count == 0) {
/* New frame, reset fragment pointers and sizes */
memset((void *)ctx->fragments.ptrs, 0, sizeof(ctx->fragments.ptrs));
memset(ctx->fragments.sizes, 0, sizeof(ctx->fragments.sizes));
}
if (ctx->fragments.enabled && !(data == NULL && data_sz == 0)) {
/* Store a pointer to this fragment and return. We haven't
* received the complete frame yet, so we will wait with decoding.
*/
ctx->fragments.ptrs[ctx->fragments.count] = data;
ctx->fragments.sizes[ctx->fragments.count] = data_sz;
ctx->fragments.count++;
if (ctx->fragments.count > (1 << EIGHT_PARTITION) + 1) {
ctx->fragments.count = 0;
*res = VPX_CODEC_INVALID_PARAM;
return -1;
}
return 0;
}
if (!ctx->fragments.enabled && (data == NULL && data_sz == 0)) {
return 0;
}
if (!ctx->fragments.enabled) {
ctx->fragments.ptrs[0] = data;
ctx->fragments.sizes[0] = data_sz;
ctx->fragments.count = 1;
}
return 1;
}
static vpx_codec_err_t vp8_decode(vpx_codec_alg_priv_t *ctx,
const uint8_t *data, unsigned int data_sz,
void *user_priv, long deadline) {
volatile vpx_codec_err_t res;
unsigned int resolution_change = 0;
unsigned int w, h;
if (!ctx->fragments.enabled && (data == NULL && data_sz == 0)) {
return 0;
}
/* Update the input fragment data */
if (update_fragments(ctx, data, data_sz, &res) <= 0) return res;
/* Determine the stream parameters. Note that we rely on peek_si to
* validate that we have a buffer that does not wrap around the top
* of the heap.
*/
w = ctx->si.w;
h = ctx->si.h;
res = vp8_peek_si_internal(ctx->fragments.ptrs[0], ctx->fragments.sizes[0],
&ctx->si, ctx->decrypt_cb, ctx->decrypt_state);
if ((res == VPX_CODEC_UNSUP_BITSTREAM) && !ctx->si.is_kf) {
/* the peek function returns an error for non keyframes, however for
* this case, it is not an error */
res = VPX_CODEC_OK;
}
if (!ctx->decoder_init && !ctx->si.is_kf) res = VPX_CODEC_UNSUP_BITSTREAM;
if ((ctx->si.h != h) || (ctx->si.w != w)) resolution_change = 1;
/* Initialize the decoder instance on the first frame*/
if (!res && !ctx->decoder_init) {
VP8D_CONFIG oxcf;
oxcf.Width = ctx->si.w;
oxcf.Height = ctx->si.h;
oxcf.Version = 9;
oxcf.postprocess = 0;
oxcf.max_threads = ctx->cfg.threads;
oxcf.error_concealment =
(ctx->base.init_flags & VPX_CODEC_USE_ERROR_CONCEALMENT);
/* If postprocessing was enabled by the application and a
* configuration has not been provided, default it.
*/
if (!ctx->postproc_cfg_set &&
(ctx->base.init_flags & VPX_CODEC_USE_POSTPROC)) {
ctx->postproc_cfg.post_proc_flag =
VP8_DEBLOCK | VP8_DEMACROBLOCK | VP8_MFQE;
ctx->postproc_cfg.deblocking_level = 4;
ctx->postproc_cfg.noise_level = 0;
}
res = vp8_create_decoder_instances(&ctx->yv12_frame_buffers, &oxcf);
if (res == VPX_CODEC_OK) ctx->decoder_init = 1;
}
/* Set these even if already initialized. The caller may have changed the
* decrypt config between frames.
*/
if (ctx->decoder_init) {
ctx->yv12_frame_buffers.pbi[0]->decrypt_cb = ctx->decrypt_cb;
ctx->yv12_frame_buffers.pbi[0]->decrypt_state = ctx->decrypt_state;
}
if (!res) {
VP8D_COMP *pbi = ctx->yv12_frame_buffers.pbi[0];
if (resolution_change) {
VP8_COMMON *const pc = &pbi->common;
MACROBLOCKD *const xd = &pbi->mb;
#if CONFIG_MULTITHREAD
int i;
#endif
pc->Width = ctx->si.w;
pc->Height = ctx->si.h;
{
int prev_mb_rows = pc->mb_rows;
if (setjmp(pbi->common.error.jmp)) {
pbi->common.error.setjmp = 0;
/* on failure clear the cached resolution to ensure a full
* reallocation is attempted on resync. */
ctx->si.w = 0;
ctx->si.h = 0;
vpx_clear_system_state();
/* same return value as used in vp8dx_receive_compressed_data */
return -1;
}
pbi->common.error.setjmp = 1;
if (pc->Width <= 0) {
pc->Width = w;
vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
"Invalid frame width");
}
if (pc->Height <= 0) {
pc->Height = h;
vpx_internal_error(&pc->error, VPX_CODEC_CORRUPT_FRAME,
"Invalid frame height");
}
if (vp8_alloc_frame_buffers(pc, pc->Width, pc->Height)) {
vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
"Failed to allocate frame buffers");
}
xd->pre = pc->yv12_fb[pc->lst_fb_idx];
xd->dst = pc->yv12_fb[pc->new_fb_idx];
#if CONFIG_MULTITHREAD
for (i = 0; i < pbi->allocated_decoding_thread_count; ++i) {
pbi->mb_row_di[i].mbd.dst = pc->yv12_fb[pc->new_fb_idx];
vp8_build_block_doffsets(&pbi->mb_row_di[i].mbd);
}
#endif
vp8_build_block_doffsets(&pbi->mb);
/* allocate memory for last frame MODE_INFO array */
#if CONFIG_ERROR_CONCEALMENT
if (pbi->ec_enabled) {
/* old prev_mip was released by vp8_de_alloc_frame_buffers()
* called in vp8_alloc_frame_buffers() */
pc->prev_mip = vpx_calloc((pc->mb_cols + 1) * (pc->mb_rows + 1),
sizeof(MODE_INFO));
if (!pc->prev_mip) {
vp8_de_alloc_frame_buffers(pc);
vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
"Failed to allocate"
"last frame MODE_INFO array");
}
pc->prev_mi = pc->prev_mip + pc->mode_info_stride + 1;
if (vp8_alloc_overlap_lists(pbi))
vpx_internal_error(&pc->error, VPX_CODEC_MEM_ERROR,
"Failed to allocate overlap lists "
"for error concealment");
}
#endif
#if CONFIG_MULTITHREAD
if (vpx_atomic_load_acquire(&pbi->b_multithreaded_rd)) {
vp8mt_alloc_temp_buffers(pbi, pc->Width, prev_mb_rows);
}
#else
(void)prev_mb_rows;
#endif
}
pbi->common.error.setjmp = 0;
/* required to get past the first get_free_fb() call */
pbi->common.fb_idx_ref_cnt[0] = 0;
}
/* update the pbi fragment data */
pbi->fragments = ctx->fragments;
ctx->user_priv = user_priv;
if (vp8dx_receive_compressed_data(pbi, data_sz, data, deadline)) {
res = update_error_state(ctx, &pbi->common.error);
}
/* get ready for the next series of fragments */
ctx->fragments.count = 0;
}
return res;
}
static vpx_image_t *vp8_get_frame(vpx_codec_alg_priv_t *ctx,
vpx_codec_iter_t *iter) {
vpx_image_t *img = NULL;
/* iter acts as a flip flop, so an image is only returned on the first
* call to get_frame.
*/
if (!(*iter) && ctx->yv12_frame_buffers.pbi[0]) {
YV12_BUFFER_CONFIG sd;
int64_t time_stamp = 0, time_end_stamp = 0;
vp8_ppflags_t flags;
vp8_zero(flags);
if (ctx->base.init_flags & VPX_CODEC_USE_POSTPROC) {
flags.post_proc_flag = ctx->postproc_cfg.post_proc_flag;
flags.deblocking_level = ctx->postproc_cfg.deblocking_level;
flags.noise_level = ctx->postproc_cfg.noise_level;
}
if (0 == vp8dx_get_raw_frame(ctx->yv12_frame_buffers.pbi[0], &sd,
&time_stamp, &time_end_stamp, &flags)) {
yuvconfig2image(&ctx->img, &sd, ctx->user_priv);
img = &ctx->img;
*iter = img;
}
}
return img;
}
static vpx_codec_err_t image2yuvconfig(const vpx_image_t *img,
YV12_BUFFER_CONFIG *yv12) {
const int y_w = img->d_w;
const int y_h = img->d_h;
const int uv_w = (img->d_w + 1) / 2;
const int uv_h = (img->d_h + 1) / 2;
vpx_codec_err_t res = VPX_CODEC_OK;
yv12->y_buffer = img->planes[VPX_PLANE_Y];
yv12->u_buffer = img->planes[VPX_PLANE_U];
yv12->v_buffer = img->planes[VPX_PLANE_V];
yv12->y_crop_width = y_w;
yv12->y_crop_height = y_h;
yv12->y_width = y_w;
yv12->y_height = y_h;
yv12->uv_crop_width = uv_w;
yv12->uv_crop_height = uv_h;
yv12->uv_width = uv_w;
yv12->uv_height = uv_h;
yv12->y_stride = img->stride[VPX_PLANE_Y];
yv12->uv_stride = img->stride[VPX_PLANE_U];
yv12->border = (img->stride[VPX_PLANE_Y] - img->d_w) / 2;
return res;
}
static vpx_codec_err_t vp8_set_reference(vpx_codec_alg_priv_t *ctx,
va_list args) {
vpx_ref_frame_t *data = va_arg(args, vpx_ref_frame_t *);
if (data) {
vpx_ref_frame_t *frame = (vpx_ref_frame_t *)data;
YV12_BUFFER_CONFIG sd;
image2yuvconfig(&frame->img, &sd);
return vp8dx_set_reference(ctx->yv12_frame_buffers.pbi[0],
frame->frame_type, &sd);
} else {
return VPX_CODEC_INVALID_PARAM;
}
}
static vpx_codec_err_t vp8_get_reference(vpx_codec_alg_priv_t *ctx,
va_list args) {
vpx_ref_frame_t *data = va_arg(args, vpx_ref_frame_t *);
if (data) {
vpx_ref_frame_t *frame = (vpx_ref_frame_t *)data;
YV12_BUFFER_CONFIG sd;
image2yuvconfig(&frame->img, &sd);
return vp8dx_get_reference(ctx->yv12_frame_buffers.pbi[0],
frame->frame_type, &sd);
} else {
return VPX_CODEC_INVALID_PARAM;
}
}
static vpx_codec_err_t vp8_get_quantizer(vpx_codec_alg_priv_t *ctx,
va_list args) {
int *const arg = va_arg(args, int *);
if (arg == NULL) return VPX_CODEC_INVALID_PARAM;
*arg = vp8dx_get_quantizer(ctx->yv12_frame_buffers.pbi[0]);
return VPX_CODEC_OK;
}
static vpx_codec_err_t vp8_set_postproc(vpx_codec_alg_priv_t *ctx,
va_list args) {
#if CONFIG_POSTPROC
vp8_postproc_cfg_t *data = va_arg(args, vp8_postproc_cfg_t *);
if (data) {
ctx->postproc_cfg_set = 1;
ctx->postproc_cfg = *((vp8_postproc_cfg_t *)data);
return VPX_CODEC_OK;
} else {
return VPX_CODEC_INVALID_PARAM;
}
#else
(void)ctx;
(void)args;
return VPX_CODEC_INCAPABLE;
#endif
}
static vpx_codec_err_t vp8_get_last_ref_updates(vpx_codec_alg_priv_t *ctx,
va_list args) {
int *update_info = va_arg(args, int *);
if (update_info) {
VP8D_COMP *pbi = (VP8D_COMP *)ctx->yv12_frame_buffers.pbi[0];
*update_info = pbi->common.refresh_alt_ref_frame * (int)VP8_ALTR_FRAME +
pbi->common.refresh_golden_frame * (int)VP8_GOLD_FRAME +
pbi->common.refresh_last_frame * (int)VP8_LAST_FRAME;
return VPX_CODEC_OK;
} else {
return VPX_CODEC_INVALID_PARAM;
}
}
static vpx_codec_err_t vp8_get_last_ref_frame(vpx_codec_alg_priv_t *ctx,
va_list args) {
int *ref_info = va_arg(args, int *);
if (ref_info) {
VP8D_COMP *pbi = (VP8D_COMP *)ctx->yv12_frame_buffers.pbi[0];
VP8_COMMON *oci = &pbi->common;
*ref_info =
(vp8dx_references_buffer(oci, ALTREF_FRAME) ? VP8_ALTR_FRAME : 0) |
(vp8dx_references_buffer(oci, GOLDEN_FRAME) ? VP8_GOLD_FRAME : 0) |
(vp8dx_references_buffer(oci, LAST_FRAME) ? VP8_LAST_FRAME : 0);
return VPX_CODEC_OK;
} else {
return VPX_CODEC_INVALID_PARAM;
}
}
static vpx_codec_err_t vp8_get_frame_corrupted(vpx_codec_alg_priv_t *ctx,
va_list args) {
int *corrupted = va_arg(args, int *);
VP8D_COMP *pbi = (VP8D_COMP *)ctx->yv12_frame_buffers.pbi[0];
if (corrupted && pbi) {
const YV12_BUFFER_CONFIG *const frame = pbi->common.frame_to_show;
if (frame == NULL) return VPX_CODEC_ERROR;
*corrupted = frame->corrupted;
return VPX_CODEC_OK;
} else {
return VPX_CODEC_INVALID_PARAM;
}
}
static vpx_codec_err_t vp8_set_decryptor(vpx_codec_alg_priv_t *ctx,
va_list args) {
vpx_decrypt_init *init = va_arg(args, vpx_decrypt_init *);
if (init) {
ctx->decrypt_cb = init->decrypt_cb;
ctx->decrypt_state = init->decrypt_state;
} else {
ctx->decrypt_cb = NULL;
ctx->decrypt_state = NULL;
}
return VPX_CODEC_OK;
}
vpx_codec_ctrl_fn_map_t vp8_ctf_maps[] = {
{ VP8_SET_REFERENCE, vp8_set_reference },
{ VP8_COPY_REFERENCE, vp8_get_reference },
{ VP8_SET_POSTPROC, vp8_set_postproc },
{ VP8D_GET_LAST_REF_UPDATES, vp8_get_last_ref_updates },
{ VP8D_GET_FRAME_CORRUPTED, vp8_get_frame_corrupted },
{ VP8D_GET_LAST_REF_USED, vp8_get_last_ref_frame },
{ VPXD_GET_LAST_QUANTIZER, vp8_get_quantizer },
{ VPXD_SET_DECRYPTOR, vp8_set_decryptor },
{ -1, NULL },
};
#ifndef VERSION_STRING
#define VERSION_STRING
#endif
CODEC_INTERFACE(vpx_codec_vp8_dx) = {
"WebM Project VP8 Decoder" VERSION_STRING,
VPX_CODEC_INTERNAL_ABI_VERSION,
VPX_CODEC_CAP_DECODER | VP8_CAP_POSTPROC | VP8_CAP_ERROR_CONCEALMENT |
VPX_CODEC_CAP_INPUT_FRAGMENTS,
/* vpx_codec_caps_t caps; */
vp8_init, /* vpx_codec_init_fn_t init; */
vp8_destroy, /* vpx_codec_destroy_fn_t destroy; */
vp8_ctf_maps, /* vpx_codec_ctrl_fn_map_t *ctrl_maps; */
{
vp8_peek_si, /* vpx_codec_peek_si_fn_t peek_si; */
vp8_get_si, /* vpx_codec_get_si_fn_t get_si; */
vp8_decode, /* vpx_codec_decode_fn_t decode; */
vp8_get_frame, /* vpx_codec_frame_get_fn_t frame_get; */
NULL,
},
{
/* encoder functions */
0, NULL, /* vpx_codec_enc_cfg_map_t */
NULL, /* vpx_codec_encode_fn_t */
NULL, /* vpx_codec_get_cx_data_fn_t */
NULL, /* vpx_codec_enc_config_set_fn_t */
NULL, /* vpx_codec_get_global_headers_fn_t */
NULL, /* vpx_codec_get_preview_frame_fn_t */
NULL /* vpx_codec_enc_mr_get_mem_loc_fn_t */
}
};