/*
 * Copyright 2011-2013 Maarten Lankhorst
 *
 * 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 <stdio.h>
#include <fcntl.h>

#include <nvif/class.h>

#include "nouveau_winsys.h"
#include "nouveau_screen.h"
#include "nouveau_context.h"
#include "nouveau_vp3_video.h"

#include "util/u_video.h"
#include "util/format/u_format.h"
#include "util/u_sampler.h"

static void
nouveau_vp3_video_buffer_resources(struct pipe_video_buffer *buffer,
                                   struct pipe_resource **resources)
{
   struct nouveau_vp3_video_buffer *buf = (struct nouveau_vp3_video_buffer *)buffer;
   unsigned i;

   assert(buf);

   for (i = 0; i < buf->num_planes; ++i) {
      resources[i] = buf->resources[i];
   }
}

static struct pipe_sampler_view **
nouveau_vp3_video_buffer_sampler_view_planes(struct pipe_video_buffer *buffer)
{
   struct nouveau_vp3_video_buffer *buf = (struct nouveau_vp3_video_buffer *)buffer;
   return buf->sampler_view_planes;
}

static struct pipe_sampler_view **
nouveau_vp3_video_buffer_sampler_view_components(struct pipe_video_buffer *buffer)
{
   struct nouveau_vp3_video_buffer *buf = (struct nouveau_vp3_video_buffer *)buffer;
   return buf->sampler_view_components;
}

static struct pipe_surface **
nouveau_vp3_video_buffer_surfaces(struct pipe_video_buffer *buffer)
{
   struct nouveau_vp3_video_buffer *buf = (struct nouveau_vp3_video_buffer *)buffer;
   return buf->surfaces;
}

static void
nouveau_vp3_video_buffer_destroy(struct pipe_video_buffer *buffer)
{
   struct nouveau_vp3_video_buffer *buf = (struct nouveau_vp3_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);
   }
   FREE(buffer);
}

struct pipe_video_buffer *
nouveau_vp3_video_buffer_create(struct pipe_context *pipe,
                         const struct pipe_video_buffer *templat,
                         int flags)
{
   struct nouveau_vp3_video_buffer *buffer;
   struct pipe_resource templ;
   unsigned i, j, component;
   struct pipe_sampler_view sv_templ;
   struct pipe_surface surf_templ;

   if (templat->buffer_format != PIPE_FORMAT_NV12)
      return vl_video_buffer_create(pipe, templat);

   assert(templat->interlaced);
   assert(pipe_format_to_chroma_format(templat->buffer_format) == PIPE_VIDEO_CHROMA_FORMAT_420);

   buffer = CALLOC_STRUCT(nouveau_vp3_video_buffer);
   if (!buffer)
      return NULL;

   buffer->base.buffer_format = templat->buffer_format;
   buffer->base.context = pipe;
   buffer->base.destroy = nouveau_vp3_video_buffer_destroy;
   buffer->base.width = templat->width;
   buffer->base.height = templat->height;
   buffer->base.get_resources = nouveau_vp3_video_buffer_resources;
   buffer->base.get_sampler_view_planes = nouveau_vp3_video_buffer_sampler_view_planes;
   buffer->base.get_sampler_view_components = nouveau_vp3_video_buffer_sampler_view_components;
   buffer->base.get_surfaces = nouveau_vp3_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 = buffer->base.width;
   templ.height0 = (buffer->base.height + 1)/2;
   templ.flags = flags;
   templ.array_size = 2;

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

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

   memset(&sv_templ, 0, sizeof(sv_templ));
   for (component = 0, i = 0; i < buffer->num_planes; ++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_X + j;
         sv_templ.swizzle_a = PIPE_SWIZZLE_1;

         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 < buffer->num_planes; ++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:
   nouveau_vp3_video_buffer_destroy(&buffer->base);
   return NULL;
}

static void
nouveau_vp3_decoder_flush(struct pipe_video_codec *decoder)
{
}

static void
nouveau_vp3_decoder_begin_frame(struct pipe_video_codec *decoder,
                                struct pipe_video_buffer *target,
                                struct pipe_picture_desc *picture)
{
}

static void
nouveau_vp3_decoder_end_frame(struct pipe_video_codec *decoder,
                              struct pipe_video_buffer *target,
                              struct pipe_picture_desc *picture)
{
}

static void
nouveau_vp3_decoder_destroy(struct pipe_video_codec *decoder)
{
   struct nouveau_vp3_decoder *dec = (struct nouveau_vp3_decoder *)decoder;
   int i;

   nouveau_bo_ref(NULL, &dec->ref_bo);
   nouveau_bo_ref(NULL, &dec->bitplane_bo);
   nouveau_bo_ref(NULL, &dec->inter_bo[0]);
   nouveau_bo_ref(NULL, &dec->inter_bo[1]);
#if NOUVEAU_VP3_DEBUG_FENCE
   nouveau_bo_ref(NULL, &dec->fence_bo);
#endif
   nouveau_bo_ref(NULL, &dec->fw_bo);

   for (i = 0; i < NOUVEAU_VP3_VIDEO_QDEPTH; ++i)
      nouveau_bo_ref(NULL, &dec->bsp_bo[i]);

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

   if (dec->channel[0] != dec->channel[1]) {
      for (i = 0; i < 3; ++i) {
         nouveau_pushbuf_destroy(&dec->pushbuf[i]);
         nouveau_object_del(&dec->channel[i]);
      }
   } else {
      nouveau_pushbuf_destroy(dec->pushbuf);
      nouveau_object_del(dec->channel);
   }

   FREE(dec);
}

void
nouveau_vp3_decoder_init_common(struct pipe_video_codec *dec)
{
   dec->destroy = nouveau_vp3_decoder_destroy;
   dec->flush = nouveau_vp3_decoder_flush;
   dec->begin_frame = nouveau_vp3_decoder_begin_frame;
   dec->end_frame = nouveau_vp3_decoder_end_frame;
}

static void vp3_getpath(enum pipe_video_profile profile, char *path)
{
   switch (u_reduce_video_profile(profile)) {
      case PIPE_VIDEO_FORMAT_MPEG12: {
         sprintf(path, "/lib/firmware/nouveau/vuc-vp3-mpeg12-0");
         break;
      }
      case PIPE_VIDEO_FORMAT_VC1: {
         sprintf(path, "/lib/firmware/nouveau/vuc-vp3-vc1-0");
         break;
      }
      case PIPE_VIDEO_FORMAT_MPEG4_AVC: {
         sprintf(path, "/lib/firmware/nouveau/vuc-vp3-h264-0");
         break;
      }
      default: assert(0);
   }
}

static void vp4_getpath(enum pipe_video_profile profile, char *path)
{
   switch (u_reduce_video_profile(profile)) {
      case PIPE_VIDEO_FORMAT_MPEG12: {
         sprintf(path, "/lib/firmware/nouveau/vuc-mpeg12-0");
         break;
      }
      case PIPE_VIDEO_FORMAT_MPEG4: {
         sprintf(path, "/lib/firmware/nouveau/vuc-mpeg4-0");
         break;
      }
      case PIPE_VIDEO_FORMAT_VC1: {
         sprintf(path, "/lib/firmware/nouveau/vuc-vc1-0");
         break;
      }
      case PIPE_VIDEO_FORMAT_MPEG4_AVC: {
         sprintf(path, "/lib/firmware/nouveau/vuc-h264-0");
         break;
      }
      default: assert(0);
   }
}

int
nouveau_vp3_load_firmware(struct nouveau_vp3_decoder *dec,
                          enum pipe_video_profile profile,
                          unsigned chipset)
{
   int fd;
   char path[PATH_MAX];
   ssize_t r;
   uint32_t *end, endval;
   struct nouveau_screen *screen = nouveau_screen(dec->base.context->screen);

   if (chipset >= 0xa3 && chipset != 0xaa && chipset != 0xac)
      vp4_getpath(profile, path);
   else
      vp3_getpath(profile, path);

   if (BO_MAP(screen, dec->fw_bo, NOUVEAU_BO_WR, dec->client))
      return 1;

   fd = open(path, O_RDONLY | O_CLOEXEC);
   if (fd < 0) {
      fprintf(stderr, "opening firmware file %s failed: %m\n", path);
      return 1;
   }
   r = read(fd, dec->fw_bo->map, 0x4000);
   close(fd);

   if (r < 0) {
      fprintf(stderr, "reading firmware file %s failed: %m\n", path);
      return 1;
   }

   if (r == 0x4000) {
      fprintf(stderr, "firmware file %s too large!\n", path);
      return 1;
   }

   if (r & 0xff) {
      fprintf(stderr, "firmware file %s wrong size!\n", path);
      return 1;
   }

   end = dec->fw_bo->map + r - 4;
   endval = *end;
   while (endval == *end)
      end--;

   r = (intptr_t)end - (intptr_t)dec->fw_bo->map + 4;

   switch (u_reduce_video_profile(profile)) {
      case PIPE_VIDEO_FORMAT_MPEG12: {
         assert((r & 0xff) == 0xe0);
         dec->fw_sizes = (0x2e0<<16) | (r - 0x2e0);
         break;
      }
      case PIPE_VIDEO_FORMAT_MPEG4: {
         assert((r & 0xff) == 0xe0);
         dec->fw_sizes = (0x2e0<<16) | (r - 0x2e0);
         break;
      }
      case PIPE_VIDEO_FORMAT_VC1: {
         assert((r & 0xff) == 0xac);
         dec->fw_sizes = (0x3ac<<16) | (r - 0x3ac);
         break;
      }
      case PIPE_VIDEO_FORMAT_MPEG4_AVC: {
         assert((r & 0xff) == 0x70);
         dec->fw_sizes = (0x370<<16) | (r - 0x370);
         break;
      }
      default:
         return 1;
   }
   munmap(dec->fw_bo->map, dec->fw_bo->size);
   dec->fw_bo->map = NULL;
   return 0;
}

static const struct nouveau_mclass
nouveau_decoder_msvld[] = {
   { G98_MSVLD, -1 },
   { IGT21A_MSVLD, -1 },
   { GT212_MSVLD, -1 },
   { GF100_MSVLD, -1 },
   { GK104_MSVLD, -1 },
   {}
};

static int
firmware_present(struct pipe_screen *pscreen, enum pipe_video_profile profile)
{
   struct nouveau_screen *screen = nouveau_screen(pscreen);
   int chipset = screen->device->chipset;
   int vp3 = chipset < 0xa3 || chipset == 0xaa || chipset == 0xac;
   int vp5 = chipset >= 0xd0;
   int ret;

   /* For all chipsets, try to create a BSP objects. Assume that if firmware
    * is present for it, firmware is also present for VP/PPP */
   if (!(screen->firmware_info.profiles_checked & 1)) {
      struct nouveau_object *channel = NULL, *bsp = NULL;
      struct nv04_fifo nv04_data = {.vram = 0xbeef0201, .gart = 0xbeef0202};
      struct nvc0_fifo nvc0_args = {};
      struct nve0_fifo nve0_args = {.engine = NOUVEAU_FIFO_ENGINE_BSP};
      void *data = NULL;
      int size;

      if (chipset < 0xc0) {
         data = &nv04_data;
         size = sizeof(nv04_data);
      } else if (chipset < 0xe0) {
         data = &nvc0_args;
         size = sizeof(nvc0_args);
      } else {
         data = &nve0_args;
         size = sizeof(nve0_args);
      }

      /* kepler must have its own channel, so just do this for everyone */
      nouveau_object_new(&screen->device->object, 0,
                         NOUVEAU_FIFO_CHANNEL_CLASS,
                         data, size, &channel);

      if (channel) {
         ret = nouveau_object_mclass(channel, nouveau_decoder_msvld);
         if (ret >= 0)
            nouveau_object_new(channel, 0, nouveau_decoder_msvld[ret].oclass,
                               NULL, 0, &bsp);
         if (bsp)
            screen->firmware_info.profiles_present |= 1;
         nouveau_object_del(&bsp);
         nouveau_object_del(&channel);
      }
      screen->firmware_info.profiles_checked |= 1;
   }

   if (!(screen->firmware_info.profiles_present & 1))
      return 0;

   /* For vp3/vp4 chipsets, make sure that the relevant firmware is present */
   if (!vp5 && !(screen->firmware_info.profiles_checked & (1 << profile))) {
      char path[PATH_MAX];
      struct stat s;
      if (vp3)
         vp3_getpath(profile, path);
      else
         vp4_getpath(profile, path);
      ret = stat(path, &s);
      if (!ret && s.st_size > 1000)
         screen->firmware_info.profiles_present |= (1 << profile);
      screen->firmware_info.profiles_checked |= (1 << profile);
   }

   return vp5 || (screen->firmware_info.profiles_present & (1 << profile));
}

int
nouveau_vp3_screen_get_video_param(struct pipe_screen *pscreen,
                                   enum pipe_video_profile profile,
                                   enum pipe_video_entrypoint entrypoint,
                                   enum pipe_video_cap param)
{
   const int chipset = nouveau_screen(pscreen)->device->chipset;
   /* Feature Set B = vp3, C = vp4, D = vp5 */
   const bool vp3 = chipset < 0xa3 || chipset == 0xaa || chipset == 0xac;
   const bool vp5 = chipset >= 0xd0;
   enum pipe_video_format codec = u_reduce_video_profile(profile);
   switch (param) {
   case PIPE_VIDEO_CAP_SUPPORTED:
      /* VP3 does not support MPEG4, VP4+ do. */
      return entrypoint == PIPE_VIDEO_ENTRYPOINT_BITSTREAM &&
         profile >= PIPE_VIDEO_PROFILE_MPEG1 &&
         profile < PIPE_VIDEO_PROFILE_HEVC_MAIN &&
         (!vp3 || codec != PIPE_VIDEO_FORMAT_MPEG4) &&
         firmware_present(pscreen, profile);
   case PIPE_VIDEO_CAP_NPOT_TEXTURES:
      return 1;
   case PIPE_VIDEO_CAP_MAX_WIDTH:
      switch (codec) {
      case PIPE_VIDEO_FORMAT_MPEG12:
         return vp5 ? 4032 : 2048;
      case PIPE_VIDEO_FORMAT_MPEG4:
         return 2048;
      case PIPE_VIDEO_FORMAT_VC1:
         return 2048;
      case PIPE_VIDEO_FORMAT_MPEG4_AVC:
         if (vp3)
            return 2032;
         if (vp5)
            return 4032;
         return 2048; /* vp4 */
      case PIPE_VIDEO_FORMAT_UNKNOWN:
         return vp5 ? 4032 : 2048;
      default:
         debug_printf("unknown video codec: %d\n", codec);
         return 0;
      }
   case PIPE_VIDEO_CAP_MAX_HEIGHT:
      switch (codec) {
      case PIPE_VIDEO_FORMAT_MPEG12:
         return vp5 ? 4048 : 2048;
      case PIPE_VIDEO_FORMAT_MPEG4:
         return 2048;
      case PIPE_VIDEO_FORMAT_VC1:
         return 2048;
      case PIPE_VIDEO_FORMAT_MPEG4_AVC:
         if (vp3)
            return 2048;
         if (vp5)
            return 4080;
         return 2048; /* vp4 */
      case PIPE_VIDEO_FORMAT_UNKNOWN:
         return vp5 ? 4080 : 2048;
      default:
         debug_printf("unknown video codec: %d\n", codec);
         return 0;
      }
   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_SIMPLE:
         return 3;
      case PIPE_VIDEO_PROFILE_MPEG4_ADVANCED_SIMPLE:
         return 5;
      case PIPE_VIDEO_PROFILE_VC1_SIMPLE:
         return 1;
      case PIPE_VIDEO_PROFILE_VC1_MAIN:
         return 2;
      case PIPE_VIDEO_PROFILE_VC1_ADVANCED:
         return 4;
      case PIPE_VIDEO_PROFILE_MPEG4_AVC_BASELINE:
      case PIPE_VIDEO_PROFILE_MPEG4_AVC_CONSTRAINED_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;
      }
   case PIPE_VIDEO_CAP_MAX_MACROBLOCKS:
      switch (codec) {
      case PIPE_VIDEO_FORMAT_MPEG12:
         return vp5 ? 65536 : 8192;
      case PIPE_VIDEO_FORMAT_MPEG4:
         return 8192;
      case PIPE_VIDEO_FORMAT_VC1:
         return 8190;
      case PIPE_VIDEO_FORMAT_MPEG4_AVC:
         if (vp3)
            return 8190;
         if (vp5)
            return 65536;
         return 8192; /* vp4 */
      default:
         debug_printf("unknown video codec: %d\n", codec);
         return 0;
      }
   default:
      debug_printf("unknown video param: %d\n", param);
      return 0;
   }
}

bool
nouveau_vp3_screen_video_supported(struct pipe_screen *screen,
                                   enum pipe_format format,
                                   enum pipe_video_profile profile,
                                   enum pipe_video_entrypoint entrypoint)
{
   if (profile != PIPE_VIDEO_PROFILE_UNKNOWN)
      return format == PIPE_FORMAT_NV12;

   return vl_video_buffer_is_format_supported(screen, format, profile, entrypoint);
}