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 <stdlib.h>
#include <string.h>
#include "vpx/vpx_decoder.h"
#include "vpx/vp8dx.h"
#include "vpx/internal/vpx_codec_internal.h"
#include "vpx_version.h"
#include "common/onyxd.h"
#include "decoder/onyxd_int.h"

#define VP8_CAP_POSTPROC (CONFIG_POSTPROC ? VPX_CODEC_CAP_POSTPROC : 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])))

static unsigned long vp8_priv_sz(const vpx_codec_dec_cfg_t *si, vpx_codec_flags_t);

typedef struct
{
    unsigned int   id;
    unsigned long  sz;
    unsigned int   align;
    unsigned int   flags;
    unsigned long(*calc_sz)(const vpx_codec_dec_cfg_t *, vpx_codec_flags_t);
} mem_req_t;

static const mem_req_t vp8_mem_req_segs[] =
{
    {VP8_SEG_ALG_PRIV,    0, 8, VPX_CODEC_MEM_ZERO, vp8_priv_sz},
    {VP8_SEG_MAX, 0, 0, 0, NULL}
};

struct vpx_codec_alg_priv
{
    vpx_codec_priv_t        base;
    vpx_codec_mmap_t        mmaps[NELEMENTS(vp8_mem_req_segs)-1];
    vpx_codec_dec_cfg_t     cfg;
    vp8_stream_info_t       si;
    int                     defer_alloc;
    int                     decoder_init;
    VP8D_PTR                pbi;
    int                     postproc_cfg_set;
    vp8_postproc_cfg_t      postproc_cfg;
#if CONFIG_POSTPROC_VISUALIZER
    unsigned int            dbg_postproc_flag;
    int                     dbg_color_ref_frame_flag;
    int                     dbg_color_mb_modes_flag;
    int                     dbg_color_b_modes_flag;
    int                     dbg_display_mv_flag;
#endif
    vpx_image_t             img;
    int                     img_setup;
    int                     img_avail;
};

static unsigned long vp8_priv_sz(const vpx_codec_dec_cfg_t *si, vpx_codec_flags_t flags)
{
    /* Although this declaration is constant, we can't use it in the requested
     * segments list because we want to define the requested segments list
     * before defining the private type (so that the number of memory maps is
     * known)
     */
    (void)si;
    return sizeof(vpx_codec_alg_priv_t);
}


static void vp8_mmap_dtor(vpx_codec_mmap_t *mmap)
{
    free(mmap->priv);
}

static vpx_codec_err_t vp8_mmap_alloc(vpx_codec_mmap_t *mmap)
{
    vpx_codec_err_t  res;
    unsigned int   align;

    align = mmap->align ? mmap->align - 1 : 0;

    if (mmap->flags & VPX_CODEC_MEM_ZERO)
        mmap->priv = calloc(1, mmap->sz + align);
    else
        mmap->priv = malloc(mmap->sz + align);

    res = (mmap->priv) ? VPX_CODEC_OK : VPX_CODEC_MEM_ERROR;
    mmap->base = (void *)((((uintptr_t)mmap->priv) + align) & ~(uintptr_t)align);
    mmap->dtor = vp8_mmap_dtor;
    return res;
}

static vpx_codec_err_t vp8_validate_mmaps(const vp8_stream_info_t *si,
        const vpx_codec_mmap_t        *mmaps,
        vpx_codec_flags_t              init_flags)
{
    int i;
    vpx_codec_err_t res = VPX_CODEC_OK;

    for (i = 0; i < NELEMENTS(vp8_mem_req_segs) - 1; i++)
    {
        /* Ensure the segment has been allocated */
        if (!mmaps[i].base)
        {
            res = VPX_CODEC_MEM_ERROR;
            break;
        }

        /* Verify variable size segment is big enough for the current si. */
        if (vp8_mem_req_segs[i].calc_sz)
        {
            vpx_codec_dec_cfg_t cfg;

            cfg.w = si->w;
            cfg.h = si->h;

            if (mmaps[i].sz < vp8_mem_req_segs[i].calc_sz(&cfg, init_flags))
            {
                res = VPX_CODEC_MEM_ERROR;
                break;
            }
        }
    }

    return res;
}

static void vp8_init_ctx(vpx_codec_ctx_t *ctx, const vpx_codec_mmap_t *mmap)
{
    int i;

    ctx->priv = mmap->base;
    ctx->priv->sz = sizeof(*ctx->priv);
    ctx->priv->iface = ctx->iface;
    ctx->priv->alg_priv = mmap->base;

    for (i = 0; i < NELEMENTS(ctx->priv->alg_priv->mmaps); i++)
        ctx->priv->alg_priv->mmaps[i].id = vp8_mem_req_segs[i].id;

    ctx->priv->alg_priv->mmaps[0] = *mmap;
    ctx->priv->alg_priv->si.sz = sizeof(ctx->priv->alg_priv->si);
    ctx->priv->init_flags = ctx->init_flags;

    if (ctx->config.dec)
    {
        /* Update the reference to the config structure to an internal copy. */
        ctx->priv->alg_priv->cfg = *ctx->config.dec;
        ctx->config.dec = &ctx->priv->alg_priv->cfg;
    }
}

static void *mmap_lkup(vpx_codec_alg_priv_t *ctx, unsigned int id)
{
    int i;

    for (i = 0; i < NELEMENTS(ctx->mmaps); i++)
        if (ctx->mmaps[i].id == id)
            return ctx->mmaps[i].base;

    return NULL;
}
static void vp8_finalize_mmaps(vpx_codec_alg_priv_t *ctx)
{
    /* nothing to clean up */
}

static vpx_codec_err_t vp8_init(vpx_codec_ctx_t *ctx)
{
    vpx_codec_err_t        res = VPX_CODEC_OK;

    /* 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_mmap_t mmap;

        mmap.id = vp8_mem_req_segs[0].id;
        mmap.sz = sizeof(vpx_codec_alg_priv_t);
        mmap.align = vp8_mem_req_segs[0].align;
        mmap.flags = vp8_mem_req_segs[0].flags;

        res = vp8_mmap_alloc(&mmap);

        if (!res)
        {
            vp8_init_ctx(ctx, &mmap);

            ctx->priv->alg_priv->defer_alloc = 1;
            /*post processing level initialized to do nothing */
        }
    }

    return res;
}

static vpx_codec_err_t vp8_destroy(vpx_codec_alg_priv_t *ctx)
{
    int i;

    vp8dx_remove_decompressor(ctx->pbi);

    for (i = NELEMENTS(ctx->mmaps) - 1; i >= 0; i--)
    {
        if (ctx->mmaps[i].dtor)
            ctx->mmaps[i].dtor(&ctx->mmaps[i]);
    }

    return VPX_CODEC_OK;
}

static vpx_codec_err_t vp8_peek_si(const uint8_t         *data,
                                   unsigned int           data_sz,
                                   vpx_codec_stream_info_t *si)
{
    vpx_codec_err_t res = VPX_CODEC_OK;

    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.
         */
        si->is_kf = 0;

        if (data_sz >= 10 && !(data[0] & 0x01))  /* I-Frame */
        {
            const uint8_t *c = data + 3;
            si->is_kf = 1;

            /* vet via sync code */
            if (c[0] != 0x9d || c[1] != 0x01 || c[2] != 0x2a)
                res = VPX_CODEC_UNSUP_BITSTREAM;

            si->w = (c[3] | (c[4] << 8)) & 0x3fff;
            si->h = (c[5] | (c[6] << 8)) & 0x3fff;

            /*printf("w=%d, h=%d\n", si->w, si->h);*/
            if (!(si->h | si->w))
                res = VPX_CODEC_UNSUP_BITSTREAM;
        }
        else
            res = VPX_CODEC_UNSUP_BITSTREAM;
    }

    return res;

}

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 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)
{
    vpx_codec_err_t res = VPX_CODEC_OK;

    ctx->img_avail = 0;

    /* 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.
     */
    if (!ctx->si.h)
        res = ctx->base.iface->dec.peek_si(data, data_sz, &ctx->si);


    /* Perform deferred allocations, if required */
    if (!res && ctx->defer_alloc)
    {
        int i;

        for (i = 1; !res && i < NELEMENTS(ctx->mmaps); i++)
        {
            vpx_codec_dec_cfg_t cfg;

            cfg.w = ctx->si.w;
            cfg.h = ctx->si.h;
            ctx->mmaps[i].id = vp8_mem_req_segs[i].id;
            ctx->mmaps[i].sz = vp8_mem_req_segs[i].sz;
            ctx->mmaps[i].align = vp8_mem_req_segs[i].align;
            ctx->mmaps[i].flags = vp8_mem_req_segs[i].flags;

            if (!ctx->mmaps[i].sz)
                ctx->mmaps[i].sz = vp8_mem_req_segs[i].calc_sz(&cfg,
                                   ctx->base.init_flags);

            res = vp8_mmap_alloc(&ctx->mmaps[i]);
        }

        if (!res)
            vp8_finalize_mmaps(ctx);

        ctx->defer_alloc = 0;
    }

    /* Initialize the decoder instance on the first frame*/
    if (!res && !ctx->decoder_init)
    {
        res = vp8_validate_mmaps(&ctx->si, ctx->mmaps, ctx->base.init_flags);

        if (!res)
        {
            VP8D_CONFIG oxcf;
            VP8D_PTR optr;

            vp8dx_initialize();

            oxcf.Width = ctx->si.w;
            oxcf.Height = ctx->si.h;
            oxcf.Version = 9;
            oxcf.postprocess = 0;
            oxcf.max_threads = ctx->cfg.threads;

            optr = vp8dx_create_decompressor(&oxcf);

            /* 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;
                ctx->postproc_cfg.deblocking_level = 4;
                ctx->postproc_cfg.noise_level = 0;
            }

            if (!optr)
                res = VPX_CODEC_ERROR;
            else
                ctx->pbi = optr;
        }

        ctx->decoder_init = 1;
    }

    if (!res && ctx->pbi)
    {
        YV12_BUFFER_CONFIG sd;
        INT64 time_stamp = 0, time_end_stamp = 0;
        vp8_ppflags_t flags = {0};

        if (ctx->base.init_flags & VPX_CODEC_USE_POSTPROC)
        {
            flags.post_proc_flag= ctx->postproc_cfg.post_proc_flag
#if CONFIG_POSTPROC_VISUALIZER

                                | ((ctx->dbg_color_ref_frame_flag != 0) ? VP8D_DEBUG_CLR_FRM_REF_BLKS : 0)
                                | ((ctx->dbg_color_mb_modes_flag != 0) ? VP8D_DEBUG_CLR_BLK_MODES : 0)
                                | ((ctx->dbg_color_b_modes_flag != 0) ? VP8D_DEBUG_CLR_BLK_MODES : 0)
                                | ((ctx->dbg_display_mv_flag != 0) ? VP8D_DEBUG_DRAW_MV : 0)
#endif
                                ;
            flags.deblocking_level      = ctx->postproc_cfg.deblocking_level;
            flags.noise_level           = ctx->postproc_cfg.noise_level;
#if CONFIG_POSTPROC_VISUALIZER
            flags.display_ref_frame_flag= ctx->dbg_color_ref_frame_flag;
            flags.display_mb_modes_flag = ctx->dbg_color_mb_modes_flag;
            flags.display_b_modes_flag  = ctx->dbg_color_b_modes_flag;
            flags.display_mv_flag       = ctx->dbg_display_mv_flag;
#endif
        }

        if (vp8dx_receive_compressed_data(ctx->pbi, data_sz, data, deadline))
        {
            VP8D_COMP *pbi = (VP8D_COMP *)ctx->pbi;
            res = update_error_state(ctx, &pbi->common.error);
        }

        if (!res && 0 == vp8dx_get_raw_frame(ctx->pbi, &sd, &time_stamp, &time_end_stamp, &flags))
        {
            /* Align width/height */
            unsigned int a_w = (sd.y_width + 15) & ~15;
            unsigned int a_h = (sd.y_height + 15) & ~15;

            vpx_img_wrap(&ctx->img, VPX_IMG_FMT_I420,
                         a_w + 2 * VP8BORDERINPIXELS,
                         a_h + 2 * VP8BORDERINPIXELS,
                         1,
                         sd.buffer_alloc);
            vpx_img_set_rect(&ctx->img,
                             VP8BORDERINPIXELS, VP8BORDERINPIXELS,
                             sd.y_width, sd.y_height);
            ctx->img.user_priv = user_priv;
            ctx->img_avail = 1;

        }
    }

    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;

    if (ctx->img_avail)
    {
        /* iter acts as a flip flop, so an image is only returned on the first
         * call to get_frame.
         */
        if (!(*iter))
        {
            img = &ctx->img;
            *iter = img;
        }
    }

    return img;
}


static
vpx_codec_err_t vp8_xma_get_mmap(const vpx_codec_ctx_t      *ctx,
                                 vpx_codec_mmap_t           *mmap,
                                 vpx_codec_iter_t           *iter)
{
    vpx_codec_err_t     res;
    const mem_req_t  *seg_iter = *iter;

    /* Get address of next segment request */
    do
    {
        if (!seg_iter)
            seg_iter = vp8_mem_req_segs;
        else if (seg_iter->id != VP8_SEG_MAX)
            seg_iter++;

        *iter = (vpx_codec_iter_t)seg_iter;

        if (seg_iter->id != VP8_SEG_MAX)
        {
            mmap->id = seg_iter->id;
            mmap->sz = seg_iter->sz;
            mmap->align = seg_iter->align;
            mmap->flags = seg_iter->flags;

            if (!seg_iter->sz)
                mmap->sz = seg_iter->calc_sz(ctx->config.dec, ctx->init_flags);

            res = VPX_CODEC_OK;
        }
        else
            res = VPX_CODEC_LIST_END;
    }
    while (!mmap->sz && res != VPX_CODEC_LIST_END);

    return res;
}

static vpx_codec_err_t vp8_xma_set_mmap(vpx_codec_ctx_t         *ctx,
                                        const vpx_codec_mmap_t  *mmap)
{
    vpx_codec_err_t res = VPX_CODEC_MEM_ERROR;
    int i, done;

    if (!ctx->priv)
    {
        if (mmap->id == VP8_SEG_ALG_PRIV)
        {
            if (!ctx->priv)
            {
                vp8_init_ctx(ctx, mmap);
                res = VPX_CODEC_OK;
            }
        }
    }

    done = 1;

    if (!res && ctx->priv->alg_priv)
    {
        for (i = 0; i < NELEMENTS(ctx->priv->alg_priv->mmaps); i++)
        {
            if (ctx->priv->alg_priv->mmaps[i].id == mmap->id)
                if (!ctx->priv->alg_priv->mmaps[i].base)
                {
                    ctx->priv->alg_priv->mmaps[i] = *mmap;
                    res = VPX_CODEC_OK;
                }

            done &= (ctx->priv->alg_priv->mmaps[i].base != NULL);
        }
    }

    if (done && !res)
    {
        vp8_finalize_mmaps(ctx->priv->alg_priv);
        res = ctx->iface->init(ctx);
    }

    return res;
}

static vpx_codec_err_t image2yuvconfig(const vpx_image_t   *img,
                                       YV12_BUFFER_CONFIG  *yv12)
{
    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_width  = img->d_w;
    yv12->y_height = img->d_h;
    yv12->uv_width = yv12->y_width / 2;
    yv12->uv_height = yv12->y_height / 2;

    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;
    yv12->clrtype = (img->fmt == VPX_IMG_FMT_VPXI420 || img->fmt == VPX_IMG_FMT_VPXYV12);

    return res;
}


static vpx_codec_err_t vp8_set_reference(vpx_codec_alg_priv_t *ctx,
        int ctr_id,
        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);

        vp8dx_set_reference(ctx->pbi, frame->frame_type, &sd);
        return VPX_CODEC_OK;
    }
    else
        return VPX_CODEC_INVALID_PARAM;

}

static vpx_codec_err_t vp8_get_reference(vpx_codec_alg_priv_t *ctx,
        int ctr_id,
        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);

        vp8dx_get_reference(ctx->pbi, frame->frame_type, &sd);
        return VPX_CODEC_OK;
    }
    else
        return VPX_CODEC_INVALID_PARAM;

}

static vpx_codec_err_t vp8_set_postproc(vpx_codec_alg_priv_t *ctx,
                                        int ctr_id,
                                        va_list args)
{
    vp8_postproc_cfg_t *data = va_arg(args, vp8_postproc_cfg_t *);
#if CONFIG_POSTPROC

    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
    return VPX_CODEC_INCAPABLE;
#endif
}

static vpx_codec_err_t vp8_set_dbg_options(vpx_codec_alg_priv_t *ctx,
                                        int ctrl_id,
                                        va_list args)
{
#if CONFIG_POSTPROC_VISUALIZER && CONFIG_POSTPROC
    int data = va_arg(args, int);

#define MAP(id, var) case id: var = data; break;

    switch (ctrl_id)
    {
        MAP (VP8_SET_DBG_COLOR_REF_FRAME,   ctx->dbg_color_ref_frame_flag);
        MAP (VP8_SET_DBG_COLOR_MB_MODES,    ctx->dbg_color_mb_modes_flag);
        MAP (VP8_SET_DBG_COLOR_B_MODES,     ctx->dbg_color_b_modes_flag);
        MAP (VP8_SET_DBG_DISPLAY_MV,        ctx->dbg_display_mv_flag);
    }

    return VPX_CODEC_OK;
#else
    return VPX_CODEC_INCAPABLE;
#endif
}

static vpx_codec_err_t vp8_get_last_ref_updates(vpx_codec_alg_priv_t *ctx,
                                                int ctrl_id,
                                                va_list args)
{
    int *update_info = va_arg(args, int *);
    VP8D_COMP *pbi = (VP8D_COMP *)ctx->pbi;

    if (update_info)
    {
        *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_frame_corrupted(vpx_codec_alg_priv_t *ctx,
                                               int ctrl_id,
                                               va_list args)
{

    int *corrupted = va_arg(args, int *);

    if (corrupted)
    {
        VP8D_COMP *pbi = (VP8D_COMP *)ctx->pbi;
        *corrupted = pbi->common.frame_to_show->corrupted;

        return VPX_CODEC_OK;
    }
    else
        return VPX_CODEC_INVALID_PARAM;

}

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},
    {VP8_SET_DBG_COLOR_REF_FRAME,   vp8_set_dbg_options},
    {VP8_SET_DBG_COLOR_MB_MODES,    vp8_set_dbg_options},
    {VP8_SET_DBG_COLOR_B_MODES,     vp8_set_dbg_options},
    {VP8_SET_DBG_DISPLAY_MV,        vp8_set_dbg_options},
    {VP8D_GET_LAST_REF_UPDATES,     vp8_get_last_ref_updates},
    {VP8D_GET_FRAME_CORRUPTED,      vp8_get_frame_corrupted},
    { -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,
    /* 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_xma_get_mmap, /* vpx_codec_get_mmap_fn_t   get_mmap; */
    vp8_xma_set_mmap, /* vpx_codec_set_mmap_fn_t   set_mmap; */
    {
        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; */
    },
    { /* encoder functions */
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED
    }
};

/*
 * BEGIN BACKWARDS COMPATIBILITY SHIM.
 */
vpx_codec_iface_t vpx_codec_vp8_algo =
{
    "WebM Project VP8 Decoder (Deprecated API)" VERSION_STRING,
    VPX_CODEC_INTERNAL_ABI_VERSION,
    VPX_CODEC_CAP_DECODER | VP8_CAP_POSTPROC,
    /* 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_xma_get_mmap, /* vpx_codec_get_mmap_fn_t   get_mmap; */
    vp8_xma_set_mmap, /* vpx_codec_set_mmap_fn_t   set_mmap; */
    {
        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; */
    },
    { /* encoder functions */
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED,
        NOT_IMPLEMENTED
    }
};