path: root/src/gallium/drivers/nv50/nv84_video.c

/*
 * Copyright 2013 Ilia Mirkin
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>

#include "util/u_format.h"
#include "util/u_sampler.h"
#include "vl/vl_zscan.h"

#include "nv84_video.h"

static int
nv84_copy_firmware(const char *path, void *dest, ssize_t len)
{
   int fd = open(path, O_RDONLY | O_CLOEXEC);
   ssize_t r;
   if (fd < 0) {
      fprintf(stderr, "opening firmware file %s failed: %m\n", path);
      return 1;
   }
   r = read(fd, dest, len);
   close(fd);

   if (r != len) {
      fprintf(stderr, "reading firwmare file %s failed: %m\n", path);
      return 1;
   }

   return 0;
}

static int
filesize(const char *path)
{
   int ret;
   struct stat statbuf;

   ret = stat(path, &statbuf);
   if (ret)
      return ret;
   return statbuf.st_size;
}

static struct nouveau_bo *
nv84_load_firmwares(struct nouveau_device *dev, struct nv84_decoder *dec,
                    const char *fw1, const char *fw2)
{
   int ret, size1, size2 = 0;
   struct nouveau_bo *fw;

   size1 = filesize(fw1);
   if (fw2)
      size2 = filesize(fw2);
   if (size1 < 0 || size2 < 0)
      return NULL;

   dec->vp_fw2_offset = align(size1, 0x100);

   ret = nouveau_bo_new(dev, NOUVEAU_BO_VRAM, 0, dec->vp_fw2_offset + size2, NULL, &fw);
   if (ret)
      return NULL;
   ret = nouveau_bo_map(fw, NOUVEAU_BO_WR, dec->client);
   if (ret)
      goto error;

   ret = nv84_copy_firmware(fw1, fw->map, size1);
   if (fw2 && !ret)
      ret = nv84_copy_firmware(fw2, fw->map + dec->vp_fw2_offset, size2);
   munmap(fw->map, fw->size);
   fw->map = NULL;
   if (!ret)
      return fw;
error:
   nouveau_bo_ref(NULL, &fw);
   return NULL;
}

static struct nouveau_bo *
nv84_load_bsp_firmware(struct nouveau_device *dev, struct nv84_decoder *dec)
{
   return nv84_load_firmwares(
         dev, dec, "/lib/firmware/nouveau/nv84_bsp-h264", NULL);
}

static struct nouveau_bo *
nv84_load_vp_firmware(struct nouveau_device *dev, struct nv84_decoder *dec)
{
   return nv84_load_firmwares(
         dev, dec,
         "/lib/firmware/nouveau/nv84_vp-h264-1",
         "/lib/firmware/nouveau/nv84_vp-h264-2");
}

static struct nouveau_bo *
nv84_load_vp_firmware_mpeg(struct nouveau_device *dev, struct nv84_decoder *dec)
{
   return nv84_load_firmwares(
         dev, dec, "/lib/firmware/nouveau/nv84_vp-mpeg12", NULL);
}

static void
nv84_decoder_decode_bitstream_h264(struct pipe_video_codec *decoder,
                                   struct pipe_video_buffer *video_target,
                                   struct pipe_picture_desc *picture,
                                   unsigned num_buffers,
                                   const void *const *data,
                                   const unsigned *num_bytes)
{
   struct nv84_decoder *dec = (struct nv84_decoder *)decoder;
   struct nv84_video_buffer *target = (struct nv84_video_buffer *)video_target;

   struct pipe_h264_picture_desc *desc = (struct pipe_h264_picture_desc *)picture;

   assert(target->base.buffer_format == PIPE_FORMAT_NV12);

   nv84_decoder_bsp(dec, desc, num_buffers, data, num_bytes, target);
   nv84_decoder_vp_h264(dec, desc, target);
}

static void
nv84_decoder_flush(struct pipe_video_codec *decoder)
{
}

static void
nv84_decoder_begin_frame_h264(struct pipe_video_codec *decoder,
                              struct pipe_video_buffer *target,
                              struct pipe_picture_desc *picture)
{
}

static void
nv84_decoder_end_frame_h264(struct pipe_video_codec *decoder,
                            struct pipe_video_buffer *target,
                            struct pipe_picture_desc *picture)
{
}

static void
nv84_decoder_decode_bitstream_mpeg12(struct pipe_video_codec *decoder,
                                     struct pipe_video_buffer *video_target,
                                     struct pipe_picture_desc *picture,
                                     unsigned num_buffers,
                                     const void *const *data,
                                     const unsigned *num_bytes)
{
   struct nv84_decoder *dec = (struct nv84_decoder *)decoder;

   assert(video_target->buffer_format == PIPE_FORMAT_NV12);

   vl_mpg12_bs_decode(dec->mpeg12_bs,
                      video_target,
                      (struct pipe_mpeg12_picture_desc *)picture,
                      num_buffers,
                      data,
                      num_bytes);
}

static void
nv84_decoder_begin_frame_mpeg12(struct pipe_video_codec *decoder,
                              struct pipe_video_buffer *target,
                              struct pipe_picture_desc *picture)
{
   struct nv84_decoder *dec = (struct nv84_decoder *)decoder;
   struct pipe_mpeg12_picture_desc *desc = (struct pipe_mpeg12_picture_desc *)picture;
   int i;

   nouveau_bo_wait(dec->mpeg12_bo, NOUVEAU_BO_RDWR, dec->client);
   dec->mpeg12_mb_info = dec->mpeg12_bo->map + 0x100;
   dec->mpeg12_data = dec->mpeg12_bo->map + 0x100 +
      align(0x20 * mb(dec->base.width) * mb(dec->base.height), 0x100);
   if (desc->intra_matrix) {
      dec->zscan = desc->alternate_scan ? vl_zscan_alternate : vl_zscan_normal;
      for (i = 0; i < 64; i++) {
         dec->mpeg12_intra_matrix[i] = desc->intra_matrix[dec->zscan[i]];
         dec->mpeg12_non_intra_matrix[i] = desc->non_intra_matrix[dec->zscan[i]];
      }
      dec->mpeg12_intra_matrix[0] = 1 << (7 - desc->intra_dc_precision);
   }
}

static void
nv84_decoder_end_frame_mpeg12(struct pipe_video_codec *decoder,
                              struct pipe_video_buffer *target,
                              struct pipe_picture_desc *picture)
{
   nv84_decoder_vp_mpeg12(
         (struct nv84_decoder *)decoder,
         (struct pipe_mpeg12_picture_desc *)picture,
         (struct nv84_video_buffer *)target);
}

static void
nv84_decoder_decode_macroblock(struct pipe_video_codec *decoder,
                               struct pipe_video_buffer *target,
                               struct pipe_picture_desc *picture,
                               const struct pipe_macroblock *macroblocks,
                               unsigned num_macroblocks)
{
   const struct pipe_mpeg12_macroblock *mb = (const struct pipe_mpeg12_macroblock *)macroblocks;
   for (int i = 0; i < num_macroblocks; i++, mb++) {
      nv84_decoder_vp_mpeg12_mb(
            (struct nv84_decoder *)decoder,
            (struct pipe_mpeg12_picture_desc *)picture,
            mb);
   }
}

static void
nv84_decoder_destroy(struct pipe_video_codec *decoder)
{
   struct nv84_decoder *dec = (struct nv84_decoder *)decoder;

   nouveau_bo_ref(NULL, &dec->bsp_fw);
   nouveau_bo_ref(NULL, &dec->bsp_data);
   nouveau_bo_ref(NULL, &dec->vp_fw);
   nouveau_bo_ref(NULL, &dec->vp_data);
   nouveau_bo_ref(NULL, &dec->mbring);
   nouveau_bo_ref(NULL, &dec->vpring);
   nouveau_bo_ref(NULL, &dec->bitstream);
   nouveau_bo_ref(NULL, &dec->vp_params);
   nouveau_bo_ref(NULL, &dec->fence);

   nouveau_object_del(&dec->bsp);
   nouveau_object_del(&dec->vp);

   nouveau_bufctx_del(&dec->bsp_bufctx);
   nouveau_pushbuf_del(&dec->bsp_pushbuf);
   nouveau_object_del(&dec->bsp_channel);

   nouveau_bufctx_del(&dec->vp_bufctx);
   nouveau_pushbuf_del(&dec->vp_pushbuf);
   nouveau_object_del(&dec->vp_channel);

   nouveau_client_del(&dec->client);

   if (dec->mpeg12_bs)
      FREE(dec->mpeg12_bs);
   FREE(dec);
}

struct pipe_video_codec *
nv84_create_decoder(struct pipe_context *context,
                    const struct pipe_video_codec *templ)
{
   struct nv50_context *nv50 = (struct nv50_context *)context;
   struct nouveau_screen *screen = &nv50->screen->base;
   struct nv84_decoder *dec;
   struct nouveau_pushbuf *bsp_push, *vp_push;
   struct nv50_surface surf;
   struct nv50_miptree mip;
   union pipe_color_union color;
   struct nv04_fifo nv04_data = { .vram = 0xbeef0201, .gart = 0xbeef0202 };
   int ret, i;
   int is_h264 = u_reduce_video_profile(templ->profile) == PIPE_VIDEO_FORMAT_MPEG4_AVC;
   int is_mpeg12 = u_reduce_video_profile(templ->profile) == PIPE_VIDEO_FORMAT_MPEG12;

   if (getenv("XVMC_VL"))
      return vl_create_decoder(context, templ);

   if ((is_h264 && templ->entrypoint != PIPE_VIDEO_ENTRYPOINT_BITSTREAM) ||
       (is_mpeg12 && templ->entrypoint > PIPE_VIDEO_ENTRYPOINT_IDCT)) {
      debug_printf("%x\n", templ->entrypoint);
      return NULL;
   }

   if (!is_h264 && !is_mpeg12) {
      debug_printf("invalid profile: %x\n", templ->profile);
      return NULL;
   }

   dec = CALLOC_STRUCT(nv84_decoder);
   if (!dec)
      return NULL;

   dec->base = *templ;
   dec->base.context = context;
   dec->base.destroy = nv84_decoder_destroy;
   dec->base.flush = nv84_decoder_flush;
   if (is_h264) {
      dec->base.decode_bitstream = nv84_decoder_decode_bitstream_h264;
      dec->base.begin_frame = nv84_decoder_begin_frame_h264;
      dec->base.end_frame = nv84_decoder_end_frame_h264;

      dec->frame_mbs = mb(dec->base.width) * mb_half(dec->base.height) * 2;
      dec->frame_size = dec->frame_mbs << 8;
      dec->vpring_deblock = align(0x30 * dec->frame_mbs, 0x100);
      dec->vpring_residual = 0x2000 + MAX2(0x32000, 0x600 * dec->frame_mbs);
      dec->vpring_ctrl = MAX2(0x10000, align(0x1080 + 0x144 * dec->frame_mbs, 0x100));
   } else if (is_mpeg12) {
      dec->base.decode_macroblock = nv84_decoder_decode_macroblock;
      dec->base.begin_frame = nv84_decoder_begin_frame_mpeg12;
      dec->base.end_frame = nv84_decoder_end_frame_mpeg12;

      if (templ->entrypoint == PIPE_VIDEO_ENTRYPOINT_BITSTREAM) {
         dec->mpeg12_bs = CALLOC_STRUCT(vl_mpg12_bs);
         if (!dec->mpeg12_bs)
            goto fail;
         vl_mpg12_bs_init(dec->mpeg12_bs, &dec->base);
         dec->base.decode_bitstream = nv84_decoder_decode_bitstream_mpeg12;
      }
   } else {
      goto fail;
   }

   ret = nouveau_client_new(screen->device, &dec->client);
   if (ret)
      goto fail;

   if (is_h264) {
      ret = nouveau_object_new(&screen->device->object, 0,
                               NOUVEAU_FIFO_CHANNEL_CLASS,
                               &nv04_data, sizeof(nv04_data), &dec->bsp_channel);
      if (ret)
         goto fail;

      ret = nouveau_pushbuf_new(dec->client, dec->bsp_channel, 4,
                                32 * 1024, true, &dec->bsp_pushbuf);
      if (ret)
         goto fail;

      ret = nouveau_bufctx_new(dec->client, 1, &dec->bsp_bufctx);
      if (ret)
         goto fail;
   }

   ret = nouveau_object_new(&screen->device->object, 0,
                            NOUVEAU_FIFO_CHANNEL_CLASS,
                            &nv04_data, sizeof(nv04_data), &dec->vp_channel);
   if (ret)
      goto fail;
   ret = nouveau_pushbuf_new(dec->client, dec->vp_channel, 4,
                             32 * 1024, true, &dec->vp_pushbuf);
   if (ret)
      goto fail;

   ret = nouveau_bufctx_new(dec->client, 1, &dec->vp_bufctx);
   if (ret)
      goto fail;

   bsp_push = dec->bsp_pushbuf;
   vp_push = dec->vp_pushbuf;

   if (is_h264) {
      dec->bsp_fw = nv84_load_bsp_firmware(screen->device, dec);
      dec->vp_fw = nv84_load_vp_firmware(screen->device, dec);
      if (!dec->bsp_fw || !dec->vp_fw)
         goto fail;
   }
   if (is_mpeg12) {
      dec->vp_fw = nv84_load_vp_firmware_mpeg(screen->device, dec);
      if (!dec->vp_fw)
         goto fail;
   }

   if (is_h264) {
      ret = nouveau_bo_new(screen->device, NOUVEAU_BO_VRAM | NOUVEAU_BO_NOSNOOP,
                           0, 0x40000, NULL, &dec->bsp_data);
      if (ret)
         goto fail;
   }
   ret = nouveau_bo_new(screen->device, NOUVEAU_BO_VRAM | NOUVEAU_BO_NOSNOOP,
                        0, 0x40000, NULL, &dec->vp_data);
   if (ret)
      goto fail;
   if (is_h264) {
      ret = nouveau_bo_new(screen->device, NOUVEAU_BO_VRAM | NOUVEAU_BO_NOSNOOP,
                           0,
                           2 * (dec->vpring_deblock +
                                dec->vpring_residual +
                                dec->vpring_ctrl +
                                0x1000),
                           NULL, &dec->vpring);
      if (ret)
         goto fail;
      ret = nouveau_bo_new(screen->device, NOUVEAU_BO_VRAM | NOUVEAU_BO_NOSNOOP,
                           0,
                           (templ->max_references + 1) * dec->frame_mbs * 0x40 +
                           dec->frame_size + 0x2000,
                           NULL, &dec->mbring);
      if (ret)
         goto fail;
      ret = nouveau_bo_new(screen->device, NOUVEAU_BO_GART,
                           0, 2 * (0x700 + MAX2(0x40000, 0x800 + 0x180 * dec->frame_mbs)),
                           NULL, &dec->bitstream);
      if (ret)
         goto fail;
      ret = nouveau_bo_map(dec->bitstream, NOUVEAU_BO_WR, dec->client);
      if (ret)
         goto fail;
      ret = nouveau_bo_new(screen->device, NOUVEAU_BO_GART,
                           0, 0x2000, NULL, &dec->vp_params);
      if (ret)
         goto fail;
      ret = nouveau_bo_map(dec->vp_params, NOUVEAU_BO_WR, dec->client);
      if (ret)
         goto fail;
   }
   if (is_mpeg12) {
      ret = nouveau_bo_new(screen->device, NOUVEAU_BO_GART,
                           0,
                           align(0x20 * mb(templ->width) * mb(templ->height), 0x100) +
                           (6 * 64 * 8) * mb(templ->width) * mb(templ->height) + 0x100,
                           NULL, &dec->mpeg12_bo);
      if (ret)
         goto fail;
      ret = nouveau_bo_map(dec->mpeg12_bo, NOUVEAU_BO_WR, dec->client);
      if (ret)
         goto fail;
   }

   ret = nouveau_bo_new(screen->device, NOUVEAU_BO_VRAM,
                        0, 0x1000, NULL, &dec->fence);
   if (ret)
      goto fail;
   ret = nouveau_bo_map(dec->fence, NOUVEAU_BO_WR, dec->client);
   if (ret)
      goto fail;
   *(uint32_t *)dec->fence->map = 0;

   if (is_h264) {
      nouveau_pushbuf_bufctx(bsp_push, dec->bsp_bufctx);
      nouveau_bufctx_refn(dec->bsp_bufctx, 0,
                          dec->bsp_fw, NOUVEAU_BO_VRAM | NOUVEAU_BO_RD);
      nouveau_bufctx_refn(dec->bsp_bufctx, 0,
                          dec->bsp_data, NOUVEAU_BO_VRAM | NOUVEAU_BO_RDWR);
   }

   nouveau_pushbuf_bufctx(vp_push, dec->vp_bufctx);
   nouveau_bufctx_refn(dec->vp_bufctx, 0, dec->vp_fw,
                       NOUVEAU_BO_VRAM | NOUVEAU_BO_RD);
   nouveau_bufctx_refn(dec->vp_bufctx, 0, dec->vp_data,
                       NOUVEAU_BO_VRAM | NOUVEAU_BO_RDWR);

   if (is_h264 && !ret)
      ret = nouveau_object_new(dec->bsp_channel, 0xbeef74b0, 0x74b0,
                               NULL, 0, &dec->bsp);

   if (!ret)
      ret = nouveau_object_new(dec->vp_channel, 0xbeef7476, 0x7476,
                               NULL, 0, &dec->vp);

   if (ret)
      goto fail;


   if (is_h264) {
      /* Zero out some parts of mbring/vpring. there's gotta be some cleaner way
       * of doing this... perhaps makes sense to just copy the relevant logic
       * here. */
      color.f[0] = color.f[1] = color.f[2] = color.f[3] = 0;
      surf.offset = dec->frame_size;
      surf.width = 64;
      surf.height = (templ->max_references + 1) * dec->frame_mbs / 4;
      surf.depth = 1;
      surf.base.format = PIPE_FORMAT_B8G8R8A8_UNORM;
      surf.base.u.tex.level = 0;
      surf.base.texture = &mip.base.base;
      mip.level[0].tile_mode = 0;
      mip.level[0].pitch = surf.width * 4;
      mip.base.domain = NOUVEAU_BO_VRAM;
      mip.base.bo = dec->mbring;
      context->clear_render_target(context, &surf.base, &color, 0, 0, 64, 4760);
      surf.offset = dec->vpring->size / 2 - 0x1000;
      surf.width = 1024;
      surf.height = 1;
      mip.level[0].pitch = surf.width * 4;
      mip.base.bo = dec->vpring;
      context->clear_render_target(context, &surf.base, &color, 0, 0, 1024, 1);
      surf.offset = dec->vpring->size - 0x1000;
      context->clear_render_target(context, &surf.base, &color, 0, 0, 1024, 1);

      PUSH_SPACE(screen->pushbuf, 5);
      PUSH_REFN(screen->pushbuf, dec->fence, NOUVEAU_BO_VRAM | NOUVEAU_BO_RDWR);
      /* The clear_render_target is done via 3D engine, so use it to write to a
       * sempahore to indicate that it's done.
       */
      BEGIN_NV04(screen->pushbuf, NV50_3D(QUERY_ADDRESS_HIGH), 4);
      PUSH_DATAh(screen->pushbuf, dec->fence->offset);
      PUSH_DATA (screen->pushbuf, dec->fence->offset);
      PUSH_DATA (screen->pushbuf, 1);
      PUSH_DATA (screen->pushbuf, 0xf010);
      PUSH_KICK (screen->pushbuf);

      PUSH_SPACE(bsp_push, 2 + 12 + 2 + 4 + 3);

      BEGIN_NV04(bsp_push, SUBC_BSP(NV01_SUBCHAN_OBJECT), 1);
      PUSH_DATA (bsp_push, dec->bsp->handle);

      BEGIN_NV04(bsp_push, SUBC_BSP(0x180), 11);
      for (i = 0; i < 11; i++)
         PUSH_DATA(bsp_push, nv04_data.vram);
      BEGIN_NV04(bsp_push, SUBC_BSP(0x1b8), 1);
      PUSH_DATA (bsp_push, nv04_data.vram);

      BEGIN_NV04(bsp_push, SUBC_BSP(0x600), 3);
      PUSH_DATAh(bsp_push, dec->bsp_fw->offset);
      PUSH_DATA (bsp_push, dec->bsp_fw->offset);
      PUSH_DATA (bsp_push, dec->bsp_fw->size);

      BEGIN_NV04(bsp_push, SUBC_BSP(0x628), 2);
      PUSH_DATA (bsp_push, dec->bsp_data->offset >> 8);
      PUSH_DATA (bsp_push, dec->bsp_data->size);
      PUSH_KICK (bsp_push);
   }

   PUSH_SPACE(vp_push, 2 + 12 + 2 + 4 + 3);

   BEGIN_NV04(vp_push, SUBC_VP(NV01_SUBCHAN_OBJECT), 1);
   PUSH_DATA (vp_push, dec->vp->handle);

   BEGIN_NV04(vp_push, SUBC_VP(0x180), 11);
   for (i = 0; i < 11; i++)
      PUSH_DATA(vp_push, nv04_data.vram);

   BEGIN_NV04(vp_push, SUBC_VP(0x1b8), 1);
   PUSH_DATA (vp_push, nv04_data.vram);

   BEGIN_NV04(vp_push, SUBC_VP(0x600), 3);
   PUSH_DATAh(vp_push, dec->vp_fw->offset);
   PUSH_DATA (vp_push, dec->vp_fw->offset);
   PUSH_DATA (vp_push, dec->vp_fw->size);

   BEGIN_NV04(vp_push, SUBC_VP(0x628), 2);
   PUSH_DATA (vp_push, dec->vp_data->offset >> 8);
   PUSH_DATA (vp_push, dec->vp_data->size);
   PUSH_KICK (vp_push);

   return &dec->base;
fail:
   nv84_decoder_destroy(&dec->base);
   return NULL;
}

static struct pipe_sampler_view **
nv84_video_buffer_sampler_view_planes(struct pipe_video_buffer *buffer)
{
   struct nv84_video_buffer *buf = (struct nv84_video_buffer *)buffer;
   return buf->sampler_view_planes;
}

static struct pipe_sampler_view **
nv84_video_buffer_sampler_view_components(struct pipe_video_buffer *buffer)
{
   struct nv84_video_buffer *buf = (struct nv84_video_buffer *)buffer;
   return buf->sampler_view_components;
}

static struct pipe_surface **
nv84_video_buffer_surfaces(struct pipe_video_buffer *buffer)
{
   struct nv84_video_buffer *buf = (struct nv84_video_buffer *)buffer;
   return buf->surfaces;
}

static void
nv84_video_buffer_destroy(struct pipe_video_buffer *buffer)
{
   struct nv84_video_buffer *buf = (struct nv84_video_buffer *)buffer;
   unsigned i;

   assert(buf);

   for (i = 0; i < VL_NUM_COMPONENTS; ++i) {
      pipe_resource_reference(&buf->resources[i], NULL);
      pipe_sampler_view_reference(&buf->sampler_view_planes[i], NULL);
      pipe_sampler_view_reference(&buf->sampler_view_components[i], NULL);
      pipe_surface_reference(&buf->surfaces[i * 2], NULL);
      pipe_surface_reference(&buf->surfaces[i * 2 + 1], NULL);
   }

   nouveau_bo_ref(NULL, &buf->interlaced);
   nouveau_bo_ref(NULL, &buf->full);

   FREE(buffer);
}

struct pipe_video_buffer *
nv84_video_buffer_create(struct pipe_context *pipe,
                         const struct pipe_video_buffer *template)
{
   struct nv84_video_buffer *buffer;
   struct pipe_resource templ;
   unsigned i, j, component;
   struct pipe_sampler_view sv_templ;
   struct pipe_surface surf_templ;
   struct nv50_miptree *mt0, *mt1;
   struct nouveau_bo *empty = NULL;
   struct nouveau_screen *screen = &((struct nv50_context *)pipe)->screen->base;
   union nouveau_bo_config cfg;
   unsigned bo_size;

   if (getenv("XVMC_VL") || template->buffer_format != PIPE_FORMAT_NV12)
      return vl_video_buffer_create(pipe, template);

   if (!template->interlaced) {
      debug_printf("Require interlaced video buffers\n");
      return NULL;
   }
   if (template->chroma_format != PIPE_VIDEO_CHROMA_FORMAT_420) {
      debug_printf("Must use 4:2:0 format\n");
      return NULL;
   }

   /*
    * Note that there are always going to be exactly two planes, one for Y,
    * and one for UV. These are also the resources. VP expects these to be
    * adjacent, so they need to belong to the same BO.
    */

   buffer = CALLOC_STRUCT(nv84_video_buffer);
   if (!buffer) return NULL;

   buffer->mvidx = -1;

   buffer->base.buffer_format = template->buffer_format;
   buffer->base.context = pipe;
   buffer->base.destroy = nv84_video_buffer_destroy;
   buffer->base.chroma_format = template->chroma_format;
   buffer->base.width = template->width;
   buffer->base.height = template->height;
   buffer->base.get_sampler_view_planes = nv84_video_buffer_sampler_view_planes;
   buffer->base.get_sampler_view_components = nv84_video_buffer_sampler_view_components;
   buffer->base.get_surfaces = nv84_video_buffer_surfaces;
   buffer->base.interlaced = true;

   memset(&templ, 0, sizeof(templ));
   templ.target = PIPE_TEXTURE_2D_ARRAY;
   templ.depth0 = 1;
   templ.bind = PIPE_BIND_SAMPLER_VIEW | PIPE_BIND_RENDER_TARGET;
   templ.format = PIPE_FORMAT_R8_UNORM;
   templ.width0 = align(template->width, 2);
   templ.height0 = align(template->height, 4) / 2;
   templ.flags = NV50_RESOURCE_FLAG_VIDEO | NV50_RESOURCE_FLAG_NOALLOC;
   templ.array_size = 2;

   cfg.nv50.tile_mode = 0x20;
   cfg.nv50.memtype = 0x70;

   buffer->resources[0] = pipe->screen->resource_create(pipe->screen, &templ);
   if (!buffer->resources[0])
      goto error;

   templ.format = PIPE_FORMAT_R8G8_UNORM;
   templ.width0 /= 2;
   templ.height0 /= 2;
   buffer->resources[1] = pipe->screen->resource_create(pipe->screen, &templ);
   if (!buffer->resources[1])
      goto error;

   mt0 = nv50_miptree(buffer->resources[0]);
   mt1 = nv50_miptree(buffer->resources[1]);

   bo_size = mt0->total_size + mt1->total_size;
   if (nouveau_bo_new(screen->device, NOUVEAU_BO_VRAM | NOUVEAU_BO_NOSNOOP, 0,
                      bo_size, &cfg, &buffer->interlaced))
      goto error;
   /* XXX Change reference frame management so that this is only allocated in
    * the decoder when necessary. */
   if (nouveau_bo_new(screen->device, NOUVEAU_BO_VRAM | NOUVEAU_BO_NOSNOOP, 0,
                      bo_size, &cfg, &buffer->full))
      goto error;

   mt0->base.bo = buffer->interlaced;
   mt0->base.domain = NOUVEAU_BO_VRAM;
   mt0->base.offset = 0;
   mt0->base.address = buffer->interlaced->offset + mt0->base.offset;
   nouveau_bo_ref(buffer->interlaced, &empty);

   mt1->base.bo = buffer->interlaced;
   mt1->base.domain = NOUVEAU_BO_VRAM;
   mt1->base.offset = mt0->layer_stride * 2;
   mt1->base.address = buffer->interlaced->offset + mt1->base.offset;
   nouveau_bo_ref(buffer->interlaced, &empty);

   memset(&sv_templ, 0, sizeof(sv_templ));
   for (component = 0, i = 0; i < 2; ++i ) {
      struct pipe_resource *res = buffer->resources[i];
      unsigned nr_components = util_format_get_nr_components(res->format);

      u_sampler_view_default_template(&sv_templ, res, res->format);
      buffer->sampler_view_planes[i] =
         pipe->create_sampler_view(pipe, res, &sv_templ);
      if (!buffer->sampler_view_planes[i])
         goto error;

      for (j = 0; j < nr_components; ++j, ++component) {
         sv_templ.swizzle_r = sv_templ.swizzle_g = sv_templ.swizzle_b =
            PIPE_SWIZZLE_RED + j;
         sv_templ.swizzle_a = PIPE_SWIZZLE_ONE;

         buffer->sampler_view_components[component] =
            pipe->create_sampler_view(pipe, res, &sv_templ);
         if (!buffer->sampler_view_components[component])
            goto error;
      }
   }

   memset(&surf_templ, 0, sizeof(surf_templ));
   for (j = 0; j < 2; ++j) {
      surf_templ.format = buffer->resources[j]->format;
      surf_templ.u.tex.first_layer = surf_templ.u.tex.last_layer = 0;
      buffer->surfaces[j * 2] =
         pipe->create_surface(pipe, buffer->resources[j], &surf_templ);
      if (!buffer->surfaces[j * 2])
         goto error;

      surf_templ.u.tex.first_layer = surf_templ.u.tex.last_layer = 1;
      buffer->surfaces[j * 2 + 1] =
         pipe->create_surface(pipe, buffer->resources[j], &surf_templ);
      if (!buffer->surfaces[j * 2 + 1])
         goto error;
   }

   return &buffer->base;

error:
   nv84_video_buffer_destroy(&buffer->base);
   return NULL;
}

int
nv84_screen_get_video_param(struct pipe_screen *pscreen,
                            enum pipe_video_profile profile,
                            enum pipe_video_cap param)
{
   switch (param) {
   case PIPE_VIDEO_CAP_SUPPORTED:
      return u_reduce_video_profile(profile) == PIPE_VIDEO_FORMAT_MPEG4_AVC ||
         u_reduce_video_profile(profile) == PIPE_VIDEO_FORMAT_MPEG12;
   case PIPE_VIDEO_CAP_NPOT_TEXTURES:
      return 1;
   case PIPE_VIDEO_CAP_MAX_WIDTH:
   case PIPE_VIDEO_CAP_MAX_HEIGHT:
      return 2048;
   case PIPE_VIDEO_CAP_PREFERED_FORMAT:
      return PIPE_FORMAT_NV12;
   case PIPE_VIDEO_CAP_SUPPORTS_INTERLACED:
   case PIPE_VIDEO_CAP_PREFERS_INTERLACED:
      return true;
   case PIPE_VIDEO_CAP_SUPPORTS_PROGRESSIVE:
      return false;
   case PIPE_VIDEO_CAP_MAX_LEVEL:
      switch (profile) {
      case PIPE_VIDEO_PROFILE_MPEG1:
         return 0;
      case PIPE_VIDEO_PROFILE_MPEG2_SIMPLE:
      case PIPE_VIDEO_PROFILE_MPEG2_MAIN:
         return 3;
      case PIPE_VIDEO_PROFILE_MPEG4_AVC_BASELINE:
      case PIPE_VIDEO_PROFILE_MPEG4_AVC_MAIN:
      case PIPE_VIDEO_PROFILE_MPEG4_AVC_HIGH:
         return 41;
      default:
         debug_printf("unknown video profile: %d\n", profile);
         return 0;
      }
   default:
      debug_printf("unknown video param: %d\n", param);
      return 0;
   }
}

boolean
nv84_screen_video_supported(struct pipe_screen *screen,
                            enum pipe_format format,
                            enum pipe_video_profile profile)
{
   if (profile != PIPE_VIDEO_PROFILE_UNKNOWN)
      return format == PIPE_FORMAT_NV12;

   return vl_video_buffer_is_format_supported(screen, format, profile);
}