/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 */

/** \file
 * \ingroup avi
 *
 * This is external code.
 */

#include <ctype.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#ifdef WIN32
#  include "BLI_winstuff.h"
#endif

#include "MEM_guardedalloc.h"

#include "BLI_fileops.h"
#include "BLI_sys_types.h"
#include "BLI_utildefines.h"

#include "AVI_avi.h"
#include "avi_intern.h"

#include "avi_endian.h"

static int AVI_DEBUG = 0;
static char DEBUG_FCC[4];

#define DEBUG_PRINT(x) \
  if (AVI_DEBUG) { \
    printf("AVI DEBUG: " x); \
  } \
  (void)0

/* local functions */
char *fcc_to_char(unsigned int fcc);
char *tcc_to_char(unsigned int tcc);

/* implementation */

unsigned int GET_FCC(FILE *fp)
{
  unsigned char tmp[4];

  tmp[0] = getc(fp);
  tmp[1] = getc(fp);
  tmp[2] = getc(fp);
  tmp[3] = getc(fp);

  return FCC(tmp);
}

unsigned int GET_TCC(FILE *fp)
{
  char tmp[5];

  tmp[0] = getc(fp);
  tmp[1] = getc(fp);
  tmp[2] = 0;
  tmp[3] = 0;

  return FCC(tmp);
}

char *fcc_to_char(unsigned int fcc)
{
  DEBUG_FCC[0] = (fcc)&127;
  DEBUG_FCC[1] = (fcc >> 8) & 127;
  DEBUG_FCC[2] = (fcc >> 16) & 127;
  DEBUG_FCC[3] = (fcc >> 24) & 127;

  return DEBUG_FCC;
}

char *tcc_to_char(unsigned int tcc)
{
  DEBUG_FCC[0] = (tcc)&127;
  DEBUG_FCC[1] = (tcc >> 8) & 127;
  DEBUG_FCC[2] = 0;
  DEBUG_FCC[3] = 0;

  return DEBUG_FCC;
}

int AVI_get_stream(AviMovie *movie, int avist_type, int stream_num)
{
  int cur_stream;

  if (movie == NULL) {
    return -AVI_ERROR_OPTION;
  }

  for (cur_stream = 0; cur_stream < movie->header->Streams; cur_stream++) {
    if (movie->streams[cur_stream].sh.Type == avist_type) {
      if (stream_num == 0) {
        return cur_stream;
      }
      else {
        stream_num--;
      }
    }
  }

  return -AVI_ERROR_FOUND;
}

static int fcc_get_stream(int fcc)
{
  char fccs[4];

  fccs[0] = fcc;
  fccs[1] = fcc >> 8;
  fccs[2] = fcc >> 16;
  fccs[3] = fcc >> 24;

  return 10 * (fccs[0] - '0') + (fccs[1] - '0');
}

static bool fcc_is_data(int fcc)
{
  char fccs[4];

  fccs[0] = fcc;
  fccs[1] = fcc >> 8;
  fccs[2] = fcc >> 16;
  fccs[3] = fcc >> 24;

  if (!isdigit(fccs[0]) || !isdigit(fccs[1]) || (fccs[2] != 'd' && fccs[2] != 'w')) {
    return 0;
  }
  if (fccs[3] != 'b' && fccs[3] != 'c') {
    return 0;
  }

  return 1;
}

AviError AVI_print_error(AviError in_error)
{
  int error;

  if ((int)in_error < 0) {
    error = -in_error;
  }
  else {
    error = in_error;
  }

  switch (error) {
    case AVI_ERROR_NONE:
      break;
    case AVI_ERROR_COMPRESSION:
      printf("AVI ERROR: compressed in an unsupported format\n");
      break;
    case AVI_ERROR_OPEN:
      printf("AVI ERROR: could not open file\n");
      break;
    case AVI_ERROR_READING:
      printf("AVI ERROR: could not read from file\n");
      break;
    case AVI_ERROR_WRITING:
      printf("AVI ERROR: could not write to file\n");
      break;
    case AVI_ERROR_FORMAT:
      printf("AVI ERROR: file is in an illegal or unrecognized format\n");
      break;
    case AVI_ERROR_ALLOC:
      printf("AVI ERROR: error encountered while allocating memory\n");
      break;
    case AVI_ERROR_OPTION:
      printf("AVI ERROR: program made illegal request\n");
      break;
    case AVI_ERROR_FOUND:
      printf("AVI ERROR: movie did not contain expected item\n");
      break;
    default:
      break;
  }

  return in_error;
}

bool AVI_is_avi(const char *name)
{
  int temp, fcca, j;
  AviMovie movie = {NULL};
  AviMainHeader header;
  AviBitmapInfoHeader bheader;
  int movie_tracks = 0;

  DEBUG_PRINT("opening movie\n");

  movie.type = AVI_MOVIE_READ;
  movie.fp = BLI_fopen(name, "rb");
  movie.offset_table = NULL;

  if (movie.fp == NULL) {
    return 0;
  }

  if (GET_FCC(movie.fp) != FCC("RIFF") || !(movie.size = GET_FCC(movie.fp))) {
    fclose(movie.fp);
    return 0;
  }

  movie.header = &header;

  if (GET_FCC(movie.fp) != FCC("AVI ") || GET_FCC(movie.fp) != FCC("LIST") || !GET_FCC(movie.fp) ||
      GET_FCC(movie.fp) != FCC("hdrl") || (movie.header->fcc = GET_FCC(movie.fp)) != FCC("avih") ||
      !(movie.header->size = GET_FCC(movie.fp))) {
    DEBUG_PRINT("bad initial header info\n");
    fclose(movie.fp);
    return 0;
  }

  movie.header->MicroSecPerFrame = GET_FCC(movie.fp);
  movie.header->MaxBytesPerSec = GET_FCC(movie.fp);
  movie.header->PaddingGranularity = GET_FCC(movie.fp);
  movie.header->Flags = GET_FCC(movie.fp);
  movie.header->TotalFrames = GET_FCC(movie.fp);
  movie.header->InitialFrames = GET_FCC(movie.fp);
  movie.header->Streams = GET_FCC(movie.fp);
  movie.header->SuggestedBufferSize = GET_FCC(movie.fp);
  movie.header->Width = GET_FCC(movie.fp);
  movie.header->Height = GET_FCC(movie.fp);
  movie.header->Reserved[0] = GET_FCC(movie.fp);
  movie.header->Reserved[1] = GET_FCC(movie.fp);
  movie.header->Reserved[2] = GET_FCC(movie.fp);
  movie.header->Reserved[3] = GET_FCC(movie.fp);

  BLI_fseek(movie.fp, movie.header->size - 14 * 4, SEEK_CUR);

  /* Limit number of streams to some reasonable amount to prevent
   * buffer overflow vulnerabilities. */
  if (movie.header->Streams < 1 || movie.header->Streams > 65536) {
    DEBUG_PRINT("Number of streams should be in range 1-65536\n");
    fclose(movie.fp);
    return 0;
  }

  movie.streams = (AviStreamRec *)MEM_calloc_arrayN(
      movie.header->Streams, sizeof(AviStreamRec), "moviestreams");

  for (temp = 0; temp < movie.header->Streams; temp++) {

    if (GET_FCC(movie.fp) != FCC("LIST") || !GET_FCC(movie.fp) ||
        GET_FCC(movie.fp) != FCC("strl") ||
        (movie.streams[temp].sh.fcc = GET_FCC(movie.fp)) != FCC("strh") ||
        !(movie.streams[temp].sh.size = GET_FCC(movie.fp))) {
      DEBUG_PRINT("bad stream header information\n");

      MEM_freeN(movie.streams);
      fclose(movie.fp);
      return 0;
    }

    movie.streams[temp].sh.Type = GET_FCC(movie.fp);
    movie.streams[temp].sh.Handler = GET_FCC(movie.fp);

    fcca = movie.streams[temp].sh.Handler;

    if (movie.streams[temp].sh.Type == FCC("vids")) {
      if (fcca == FCC("DIB ") || fcca == FCC("RGB ") || fcca == FCC("rgb ") ||
          fcca == FCC("RAW ") || fcca == 0) {
        movie.streams[temp].format = AVI_FORMAT_AVI_RGB;
      }
      else if (fcca == FCC("mjpg") || fcca == FCC("MJPG")) {
        movie.streams[temp].format = AVI_FORMAT_MJPEG;
      }
      else {
        MEM_freeN(movie.streams);
        fclose(movie.fp);
        return 0;
      }
      movie_tracks++;
    }

    movie.streams[temp].sh.Flags = GET_FCC(movie.fp);
    movie.streams[temp].sh.Priority = GET_TCC(movie.fp);
    movie.streams[temp].sh.Language = GET_TCC(movie.fp);
    movie.streams[temp].sh.InitialFrames = GET_FCC(movie.fp);
    movie.streams[temp].sh.Scale = GET_FCC(movie.fp);
    movie.streams[temp].sh.Rate = GET_FCC(movie.fp);
    movie.streams[temp].sh.Start = GET_FCC(movie.fp);
    movie.streams[temp].sh.Length = GET_FCC(movie.fp);
    movie.streams[temp].sh.SuggestedBufferSize = GET_FCC(movie.fp);
    movie.streams[temp].sh.Quality = GET_FCC(movie.fp);
    movie.streams[temp].sh.SampleSize = GET_FCC(movie.fp);
    movie.streams[temp].sh.left = GET_TCC(movie.fp);
    movie.streams[temp].sh.top = GET_TCC(movie.fp);
    movie.streams[temp].sh.right = GET_TCC(movie.fp);
    movie.streams[temp].sh.bottom = GET_TCC(movie.fp);

    BLI_fseek(movie.fp, movie.streams[temp].sh.size - 14 * 4, SEEK_CUR);

    if (GET_FCC(movie.fp) != FCC("strf")) {
      DEBUG_PRINT("no stream format information\n");
      MEM_freeN(movie.streams);
      fclose(movie.fp);
      return 0;
    }

    movie.streams[temp].sf_size = GET_FCC(movie.fp);
    if (movie.streams[temp].sh.Type == FCC("vids")) {
      j = movie.streams[temp].sf_size - (sizeof(AviBitmapInfoHeader) - 8);
      if (j >= 0) {
        AviBitmapInfoHeader *bi;

        movie.streams[temp].sf = &bheader;
        bi = (AviBitmapInfoHeader *)movie.streams[temp].sf;

        bi->fcc = FCC("strf");
        bi->size = movie.streams[temp].sf_size;
        bi->Size = GET_FCC(movie.fp);
        bi->Width = GET_FCC(movie.fp);
        bi->Height = GET_FCC(movie.fp);
        bi->Planes = GET_TCC(movie.fp);
        bi->BitCount = GET_TCC(movie.fp);
        bi->Compression = GET_FCC(movie.fp);
        bi->SizeImage = GET_FCC(movie.fp);
        bi->XPelsPerMeter = GET_FCC(movie.fp);
        bi->YPelsPerMeter = GET_FCC(movie.fp);
        bi->ClrUsed = GET_FCC(movie.fp);
        bi->ClrImportant = GET_FCC(movie.fp);

        fcca = bi->Compression;

        if (movie.streams[temp].format == AVI_FORMAT_AVI_RGB) {
          if (fcca == FCC("DIB ") || fcca == FCC("RGB ") || fcca == FCC("rgb ") ||
              fcca == FCC("RAW ") || fcca == 0) {
            /* pass */
          }
          else if (fcca == FCC("mjpg") || fcca == FCC("MJPG")) {
            movie.streams[temp].format = AVI_FORMAT_MJPEG;
          }
          else {
            MEM_freeN(movie.streams);
            fclose(movie.fp);
            return 0;
          }
        }
      }
      if (j > 0) {
        BLI_fseek(movie.fp, j, SEEK_CUR);
      }
    }
    else {
      BLI_fseek(movie.fp, movie.streams[temp].sf_size, SEEK_CUR);
    }

    /* Walk to the next LIST */
    while (GET_FCC(movie.fp) != FCC("LIST")) {
      temp = GET_FCC(movie.fp);
      if (temp < 0 || BLI_ftell(movie.fp) > movie.size) {
        DEBUG_PRINT("incorrect size in header or error in AVI\n");

        MEM_freeN(movie.streams);
        fclose(movie.fp);
        return 0;
      }
      BLI_fseek(movie.fp, temp, SEEK_CUR);
    }

    BLI_fseek(movie.fp, -4L, SEEK_CUR);
  }

  MEM_freeN(movie.streams);
  fclose(movie.fp);

  /* at least one video track is needed */
  return (movie_tracks != 0);
}

AviError AVI_open_movie(const char *name, AviMovie *movie)
{
  int temp, fcca, size, j;

  DEBUG_PRINT("opening movie\n");

  memset(movie, 0, sizeof(AviMovie));

  movie->type = AVI_MOVIE_READ;
  movie->fp = BLI_fopen(name, "rb");
  movie->offset_table = NULL;

  if (movie->fp == NULL) {
    return AVI_ERROR_OPEN;
  }

  if (GET_FCC(movie->fp) != FCC("RIFF") || !(movie->size = GET_FCC(movie->fp))) {
    return AVI_ERROR_FORMAT;
  }

  movie->header = (AviMainHeader *)MEM_mallocN(sizeof(AviMainHeader), "movieheader");

  if (GET_FCC(movie->fp) != FCC("AVI ") || GET_FCC(movie->fp) != FCC("LIST") ||
      !GET_FCC(movie->fp) || GET_FCC(movie->fp) != FCC("hdrl") ||
      (movie->header->fcc = GET_FCC(movie->fp)) != FCC("avih") ||
      !(movie->header->size = GET_FCC(movie->fp))) {
    DEBUG_PRINT("bad initial header info\n");
    return AVI_ERROR_FORMAT;
  }

  movie->header->MicroSecPerFrame = GET_FCC(movie->fp);
  movie->header->MaxBytesPerSec = GET_FCC(movie->fp);
  movie->header->PaddingGranularity = GET_FCC(movie->fp);
  movie->header->Flags = GET_FCC(movie->fp);
  movie->header->TotalFrames = GET_FCC(movie->fp);
  movie->header->InitialFrames = GET_FCC(movie->fp);
  movie->header->Streams = GET_FCC(movie->fp);
  movie->header->SuggestedBufferSize = GET_FCC(movie->fp);
  movie->header->Width = GET_FCC(movie->fp);
  movie->header->Height = GET_FCC(movie->fp);
  movie->header->Reserved[0] = GET_FCC(movie->fp);
  movie->header->Reserved[1] = GET_FCC(movie->fp);
  movie->header->Reserved[2] = GET_FCC(movie->fp);
  movie->header->Reserved[3] = GET_FCC(movie->fp);

  BLI_fseek(movie->fp, movie->header->size - 14 * 4, SEEK_CUR);

  /* Limit number of streams to some reasonable amount to prevent
   * buffer overflow vulnerabilities. */
  if (movie->header->Streams < 1 || movie->header->Streams > 65536) {
    DEBUG_PRINT("Number of streams should be in range 1-65536\n");
    return AVI_ERROR_FORMAT;
  }

  movie->streams = (AviStreamRec *)MEM_calloc_arrayN(
      movie->header->Streams, sizeof(AviStreamRec), "moviestreams");

  for (temp = 0; temp < movie->header->Streams; temp++) {

    if (GET_FCC(movie->fp) != FCC("LIST") || !GET_FCC(movie->fp) ||
        GET_FCC(movie->fp) != FCC("strl") ||
        (movie->streams[temp].sh.fcc = GET_FCC(movie->fp)) != FCC("strh") ||
        !(movie->streams[temp].sh.size = GET_FCC(movie->fp))) {
      DEBUG_PRINT("bad stream header information\n");
      return AVI_ERROR_FORMAT;
    }

    movie->streams[temp].sh.Type = GET_FCC(movie->fp);
    movie->streams[temp].sh.Handler = GET_FCC(movie->fp);

    fcca = movie->streams[temp].sh.Handler;

    if (movie->streams[temp].sh.Type == FCC("vids")) {
      if (fcca == FCC("DIB ") || fcca == FCC("RGB ") || fcca == FCC("rgb ") ||
          fcca == FCC("RAW ") || fcca == 0) {
        movie->streams[temp].format = AVI_FORMAT_AVI_RGB;
      }
      else if (fcca == FCC("mjpg") || fcca == FCC("MJPG")) {
        movie->streams[temp].format = AVI_FORMAT_MJPEG;
      }
      else {
        return AVI_ERROR_COMPRESSION;
      }
    }

    movie->streams[temp].sh.Flags = GET_FCC(movie->fp);
    movie->streams[temp].sh.Priority = GET_TCC(movie->fp);
    movie->streams[temp].sh.Language = GET_TCC(movie->fp);
    movie->streams[temp].sh.InitialFrames = GET_FCC(movie->fp);
    movie->streams[temp].sh.Scale = GET_FCC(movie->fp);
    movie->streams[temp].sh.Rate = GET_FCC(movie->fp);
    movie->streams[temp].sh.Start = GET_FCC(movie->fp);
    movie->streams[temp].sh.Length = GET_FCC(movie->fp);
    movie->streams[temp].sh.SuggestedBufferSize = GET_FCC(movie->fp);
    movie->streams[temp].sh.Quality = GET_FCC(movie->fp);
    movie->streams[temp].sh.SampleSize = GET_FCC(movie->fp);
    movie->streams[temp].sh.left = GET_TCC(movie->fp);
    movie->streams[temp].sh.top = GET_TCC(movie->fp);
    movie->streams[temp].sh.right = GET_TCC(movie->fp);
    movie->streams[temp].sh.bottom = GET_TCC(movie->fp);

    BLI_fseek(movie->fp, movie->streams[temp].sh.size - 14 * 4, SEEK_CUR);

    if (GET_FCC(movie->fp) != FCC("strf")) {
      DEBUG_PRINT("no stream format information\n");
      return AVI_ERROR_FORMAT;
    }

    movie->streams[temp].sf_size = GET_FCC(movie->fp);
    if (movie->streams[temp].sh.Type == FCC("vids")) {
      j = movie->streams[temp].sf_size - (sizeof(AviBitmapInfoHeader) - 8);
      if (j >= 0) {
        AviBitmapInfoHeader *bi;

        movie->streams[temp].sf = MEM_mallocN(sizeof(AviBitmapInfoHeader), "streamformat");

        bi = (AviBitmapInfoHeader *)movie->streams[temp].sf;

        bi->fcc = FCC("strf");
        bi->size = movie->streams[temp].sf_size;
        bi->Size = GET_FCC(movie->fp);
        bi->Width = GET_FCC(movie->fp);
        bi->Height = GET_FCC(movie->fp);
        bi->Planes = GET_TCC(movie->fp);
        bi->BitCount = GET_TCC(movie->fp);
        bi->Compression = GET_FCC(movie->fp);
        bi->SizeImage = GET_FCC(movie->fp);
        bi->XPelsPerMeter = GET_FCC(movie->fp);
        bi->YPelsPerMeter = GET_FCC(movie->fp);
        bi->ClrUsed = GET_FCC(movie->fp);
        bi->ClrImportant = GET_FCC(movie->fp);

        fcca = bi->Compression;

        if (movie->streams[temp].format == AVI_FORMAT_AVI_RGB) {
          if (fcca == FCC("DIB ") || fcca == FCC("RGB ") || fcca == FCC("rgb ") ||
              fcca == FCC("RAW ") || fcca == 0) {
            /* pass */
          }
          else if (fcca == FCC("mjpg") || fcca == FCC("MJPG")) {
            movie->streams[temp].format = AVI_FORMAT_MJPEG;
          }
          else {
            return AVI_ERROR_COMPRESSION;
          }
        }
      }
      if (j > 0) {
        BLI_fseek(movie->fp, j, SEEK_CUR);
      }
    }
    else {
      BLI_fseek(movie->fp, movie->streams[temp].sf_size, SEEK_CUR);
    }

    /* Walk to the next LIST */
    while (GET_FCC(movie->fp) != FCC("LIST")) {
      temp = GET_FCC(movie->fp);
      if (temp < 0 || BLI_ftell(movie->fp) > movie->size) {
        DEBUG_PRINT("incorrect size in header or error in AVI\n");
        return AVI_ERROR_FORMAT;
      }
      BLI_fseek(movie->fp, temp, SEEK_CUR);
    }

    BLI_fseek(movie->fp, -4L, SEEK_CUR);
  }

  while (1) {
    temp = GET_FCC(movie->fp);
    size = GET_FCC(movie->fp);

    if (size == 0) {
      break;
    }

    if (temp == FCC("LIST")) {
      if (GET_FCC(movie->fp) == FCC("movi")) {
        break;
      }
      else {
        BLI_fseek(movie->fp, size - 4, SEEK_CUR);
      }
    }
    else {
      BLI_fseek(movie->fp, size, SEEK_CUR);
    }
    if (BLI_ftell(movie->fp) > movie->size) {
      DEBUG_PRINT("incorrect size in header or error in AVI\n");
      return AVI_ERROR_FORMAT;
    }
  }

  movie->movi_offset = BLI_ftell(movie->fp);
  movie->read_offset = movie->movi_offset;

  /* Read in the index if the file has one, otherwise create one */
  if (movie->header->Flags & AVIF_HASINDEX) {
    BLI_fseek(movie->fp, size - 4, SEEK_CUR);

    if (GET_FCC(movie->fp) != FCC("idx1")) {
      DEBUG_PRINT("bad index informatio\n");
      return AVI_ERROR_FORMAT;
    }

    movie->index_entries = GET_FCC(movie->fp) / sizeof(AviIndexEntry);
    if (movie->index_entries == 0) {
      DEBUG_PRINT("no index entries\n");
      return AVI_ERROR_FORMAT;
    }

    movie->entries = (AviIndexEntry *)MEM_mallocN(movie->index_entries * sizeof(AviIndexEntry),
                                                  "movieentries");

    for (temp = 0; temp < movie->index_entries; temp++) {
      movie->entries[temp].ChunkId = GET_FCC(movie->fp);
      movie->entries[temp].Flags = GET_FCC(movie->fp);
      movie->entries[temp].Offset = GET_FCC(movie->fp);
      movie->entries[temp].Size = GET_FCC(movie->fp);

      if (AVI_DEBUG) {
        printf("Index entry %04d: ChunkId:%s Flags:%d Offset:%d Size:%d\n",
               temp,
               fcc_to_char(movie->entries[temp].ChunkId),
               movie->entries[temp].Flags,
               movie->entries[temp].Offset,
               movie->entries[temp].Size);
      }
    }

    /* Some AVI's have offset entries in absolute coordinates
     * instead of an offset from the movie beginning... this is...
     * wacky, but we need to handle it. The wacky offset always
     * starts at movi_offset it seems... so we'll check that.
     * Note the offset needs an extra 4 bytes for some
     * undetermined reason */

    if (movie->entries[0].Offset == movie->movi_offset) {
      movie->read_offset = 4;
    }
  }

  DEBUG_PRINT("movie successfully opened\n");
  return AVI_ERROR_NONE;
}

void *AVI_read_frame(AviMovie *movie, AviFormat format, int frame, int stream)
{
  int cur_frame = -1, i = 0, rewind = 1;
  void *buffer;

  /* Retrieve the record number of the desired frame in the index
   * If a chunk has Size 0 we need to rewind to previous frame */
  while (rewind && frame > -1) {
    i = 0;
    cur_frame = -1;
    rewind = 0;

    while (cur_frame < frame && i < movie->index_entries) {
      if (fcc_is_data(movie->entries[i].ChunkId) &&
          fcc_get_stream(movie->entries[i].ChunkId) == stream) {
        if ((cur_frame == frame - 1) && (movie->entries[i].Size == 0)) {
          rewind = 1;
          frame = frame - 1;
        }
        else {
          cur_frame++;
        }
      }
      i++;
    }
  }

  if (cur_frame != frame) {
    return NULL;
  }

  BLI_fseek(movie->fp, movie->read_offset + movie->entries[i - 1].Offset, SEEK_SET);

  size_t size = GET_FCC(movie->fp);
  buffer = MEM_mallocN(size, "readbuffer");

  if (fread(buffer, 1, size, movie->fp) != size) {
    MEM_freeN(buffer);

    return NULL;
  }

  buffer = avi_format_convert(movie, stream, buffer, movie->streams[stream].format, format, &size);

  return buffer;
}

AviError AVI_close(AviMovie *movie)
{
  int i;

  fclose(movie->fp);

  for (i = 0; i < movie->header->Streams; i++) {
    if (movie->streams[i].sf != NULL) {
      MEM_freeN(movie->streams[i].sf);
    }
  }

  MEM_freeN(movie->header);
  MEM_freeN(movie->streams);

  if (movie->entries != NULL) {
    MEM_freeN(movie->entries);
  }
  if (movie->offset_table != NULL) {
    MEM_freeN(movie->offset_table);
  }

  return AVI_ERROR_NONE;
}

AviError AVI_open_compress(char *name, AviMovie *movie, int streams, ...)
{
  va_list ap;
  AviList list;
  AviChunk chunk;
  int i;
  int64_t header_pos1, header_pos2;
  int64_t stream_pos1, stream_pos2;
  int64_t junk_pos;

  movie->type = AVI_MOVIE_WRITE;
  movie->fp = BLI_fopen(name, "wb");

  movie->index_entries = 0;

  if (movie->fp == NULL) {
    return AVI_ERROR_OPEN;
  }

  movie->offset_table = (int64_t *)MEM_mallocN((1 + streams * 2) * sizeof(int64_t), "offsettable");

  for (i = 0; i < 1 + streams * 2; i++) {
    movie->offset_table[i] = -1L;
  }

  movie->entries = NULL;

  movie->header = (AviMainHeader *)MEM_mallocN(sizeof(AviMainHeader), "movieheader");

  movie->header->fcc = FCC("avih");
  movie->header->size = 56;
  movie->header->MicroSecPerFrame = 66667;
  movie->header->MaxBytesPerSec = 0;
  movie->header->PaddingGranularity = 0;
  movie->header->Flags = AVIF_HASINDEX | AVIF_MUSTUSEINDEX;
  movie->header->TotalFrames = 0;
  movie->header->InitialFrames = 0;
  movie->header->Streams = streams;
  movie->header->SuggestedBufferSize = 0;
  movie->header->Width = 0;
  movie->header->Height = 0;
  movie->header->Reserved[0] = 0;
  movie->header->Reserved[1] = 0;
  movie->header->Reserved[2] = 0;
  movie->header->Reserved[3] = 0;

  /* Limit number of streams to some reasonable amount to prevent
   * buffer overflow vulnerabilities. */
  if (movie->header->Streams < 0 || movie->header->Streams > 65536) {
    DEBUG_PRINT("Number of streams should be in range 0-65536\n");
    return AVI_ERROR_FORMAT;
  }

  movie->streams = (AviStreamRec *)MEM_mallocN(sizeof(AviStreamRec) * movie->header->Streams,
                                               "moviestreams");

  va_start(ap, streams);

  for (i = 0; i < movie->header->Streams; i++) {
    movie->streams[i].format = va_arg(ap, AviFormat);

    movie->streams[i].sh.fcc = FCC("strh");
    movie->streams[i].sh.size = 56;
    movie->streams[i].sh.Type = avi_get_format_type(movie->streams[i].format);
    if (movie->streams[i].sh.Type == 0) {
      va_end(ap);
      return AVI_ERROR_FORMAT;
    }

    movie->streams[i].sh.Handler = avi_get_format_fcc(movie->streams[i].format);
    if (movie->streams[i].sh.Handler == 0) {
      va_end(ap);
      return AVI_ERROR_FORMAT;
    }

    movie->streams[i].sh.Flags = 0;
    movie->streams[i].sh.Priority = 0;
    movie->streams[i].sh.Language = 0;
    movie->streams[i].sh.InitialFrames = 0;
    movie->streams[i].sh.Scale = 66667;
    movie->streams[i].sh.Rate = 1000000;
    movie->streams[i].sh.Start = 0;
    movie->streams[i].sh.Length = 0;
    movie->streams[i].sh.SuggestedBufferSize = 0;
    movie->streams[i].sh.Quality = 10000;
    movie->streams[i].sh.SampleSize = 0;
    movie->streams[i].sh.left = 0;
    movie->streams[i].sh.top = 0;
    movie->streams[i].sh.right = 0;
    movie->streams[i].sh.bottom = 0;

    if (movie->streams[i].sh.Type == FCC("vids")) {
      movie->streams[i].sf = MEM_mallocN(sizeof(AviBitmapInfoHeader), "moviestreamformatS");
      movie->streams[i].sf_size = sizeof(AviBitmapInfoHeader);

      ((AviBitmapInfoHeader *)movie->streams[i].sf)->fcc = FCC("strf");
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->size = movie->streams[i].sf_size - 8;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->Size = movie->streams[i].sf_size - 8;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->Width = 0;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->Height = 0;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->Planes = 1;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->BitCount = 24;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->Compression = avi_get_format_compression(
          movie->streams[i].format);
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->SizeImage = 0;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->XPelsPerMeter = 0;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->YPelsPerMeter = 0;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->ClrUsed = 0;
      ((AviBitmapInfoHeader *)movie->streams[i].sf)->ClrImportant = 0;
    }
  }

  list.fcc = FCC("RIFF");
  list.size = 0;
  list.ids = FCC("AVI ");

  awrite(movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

  list.fcc = FCC("LIST");
  list.size = 0;
  list.ids = FCC("hdrl");

  awrite(movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

  header_pos1 = BLI_ftell(movie->fp);

  movie->offset_table[0] = BLI_ftell(movie->fp);

  awrite(movie, movie->header, 1, sizeof(AviMainHeader), movie->fp, AVI_MAINH);

  for (i = 0; i < movie->header->Streams; i++) {
    list.fcc = FCC("LIST");
    list.size = 0;
    list.ids = FCC("strl");

    awrite(movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

    stream_pos1 = BLI_ftell(movie->fp);

    movie->offset_table[1 + i * 2] = BLI_ftell(movie->fp);
    awrite(movie, &movie->streams[i].sh, 1, sizeof(AviStreamHeader), movie->fp, AVI_STREAMH);

    movie->offset_table[1 + i * 2 + 1] = BLI_ftell(movie->fp);
    awrite(movie, movie->streams[i].sf, 1, movie->streams[i].sf_size, movie->fp, AVI_BITMAPH);

    stream_pos2 = BLI_ftell(movie->fp);

    BLI_fseek(movie->fp, stream_pos1 - 8, SEEK_SET);

    PUT_FCCN((stream_pos2 - stream_pos1 + 4L), movie->fp);

    BLI_fseek(movie->fp, stream_pos2, SEEK_SET);
  }

  junk_pos = BLI_ftell(movie->fp);

  if (junk_pos < 2024 - 8) {
    chunk.fcc = FCC("JUNK");
    chunk.size = 2024 - 8 - (int)junk_pos;

    awrite(movie, &chunk, 1, sizeof(AviChunk), movie->fp, AVI_CHUNK);

    for (i = 0; i < chunk.size; i++) {
      putc(0, movie->fp);
    }
  }

  header_pos2 = BLI_ftell(movie->fp);

  list.fcc = FCC("LIST");
  list.size = 0;
  list.ids = FCC("movi");

  awrite(movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

  movie->movi_offset = BLI_ftell(movie->fp) - 8L;

  BLI_fseek(movie->fp, AVI_HDRL_SOFF, SEEK_SET);

  PUT_FCCN((header_pos2 - header_pos1 + 4L), movie->fp);

  va_end(ap);

  return AVI_ERROR_NONE;
}

AviError AVI_write_frame(AviMovie *movie, int frame_num, ...)
{
  AviList list;
  AviChunk chunk;
  va_list ap;
  int stream;
  int64_t rec_off;
  AviFormat format;
  void *buffer;

  if (frame_num < 0) {
    return AVI_ERROR_OPTION;
  }

  /* Allocate the new memory for the index entry */

  if (frame_num >= movie->index_entries) {
    const size_t entry_size = (movie->header->Streams + 1) * sizeof(AviIndexEntry);
    movie->entries = (AviIndexEntry *)MEM_recallocN(movie->entries, (frame_num + 1) * entry_size);
    movie->index_entries = frame_num + 1;
  }

  /* Slap a new record entry onto the end of the file */

  BLI_fseek(movie->fp, 0L, SEEK_END);

  list.fcc = FCC("LIST");
  list.size = 0;
  list.ids = FCC("rec ");

  awrite(movie, &list, 1, sizeof(AviList), movie->fp, AVI_LIST);

  rec_off = BLI_ftell(movie->fp) - 8L;

  /* Write a frame for every stream */

  va_start(ap, frame_num);

  for (stream = 0; stream < movie->header->Streams; stream++) {
    unsigned int tbuf = 0;

    format = va_arg(ap, AviFormat);
    buffer = va_arg(ap, void *);
    size_t size = va_arg(ap, int);

    /* Convert the buffer into the output format */
    buffer = avi_format_convert(
        movie, stream, buffer, format, movie->streams[stream].format, &size);

    /* Write the header info for this data chunk */

    BLI_fseek(movie->fp, 0L, SEEK_END);

    chunk.fcc = avi_get_data_id(format, stream);
    chunk.size = size;

    if (size % 4) {
      chunk.size += 4 - size % 4;
    }

    awrite(movie, &chunk, 1, sizeof(AviChunk), movie->fp, AVI_CHUNK);

    /* Write the index entry for this data chunk */

    movie->entries[frame_num * (movie->header->Streams + 1) + stream + 1].ChunkId = chunk.fcc;
    movie->entries[frame_num * (movie->header->Streams + 1) + stream + 1].Flags = AVIIF_KEYFRAME;
    movie->entries[frame_num * (movie->header->Streams + 1) + stream + 1].Offset =
        (int)(BLI_ftell(movie->fp) - 12L - movie->movi_offset);
    movie->entries[frame_num * (movie->header->Streams + 1) + stream + 1].Size = chunk.size;

    /* Write the chunk */
    awrite(movie, buffer, 1, size, movie->fp, AVI_RAW);
    MEM_freeN(buffer);

    if (size % 4) {
      awrite(movie, &tbuf, 1, 4 - size % 4, movie->fp, AVI_RAW);
    }

    /* Update the stream headers length field */
    movie->streams[stream].sh.Length++;
    BLI_fseek(movie->fp, movie->offset_table[1 + stream * 2], SEEK_SET);
    awrite(movie, &movie->streams[stream].sh, 1, sizeof(AviStreamHeader), movie->fp, AVI_STREAMH);
  }
  va_end(ap);

  /* Record the entry for the new record */

  BLI_fseek(movie->fp, 0L, SEEK_END);

  movie->entries[frame_num * (movie->header->Streams + 1)].ChunkId = FCC("rec ");
  movie->entries[frame_num * (movie->header->Streams + 1)].Flags = AVIIF_LIST;
  movie->entries[frame_num * (movie->header->Streams + 1)].Offset = (int)(rec_off - 8L -
                                                                          movie->movi_offset);
  movie->entries[frame_num * (movie->header->Streams + 1)].Size = (int)(BLI_ftell(movie->fp) -
                                                                        (rec_off + 4L));

  /* Update the record size */
  BLI_fseek(movie->fp, rec_off, SEEK_SET);
  PUT_FCCN(movie->entries[frame_num * (movie->header->Streams + 1)].Size, movie->fp);

  /* Update the main header information in the file */
  movie->header->TotalFrames++;
  BLI_fseek(movie->fp, movie->offset_table[0], SEEK_SET);
  awrite(movie, movie->header, 1, sizeof(AviMainHeader), movie->fp, AVI_MAINH);

  return AVI_ERROR_NONE;
}

AviError AVI_close_compress(AviMovie *movie)
{
  int temp, movi_size, i;

  if (movie->fp == NULL) {
    /* none of the allocations below were done if the file failed to open */
    return AVI_ERROR_FOUND;
  }

  BLI_fseek(movie->fp, 0L, SEEK_END);
  movi_size = (int)BLI_ftell(movie->fp);

  PUT_FCC("idx1", movie->fp);
  PUT_FCCN((movie->index_entries * (movie->header->Streams + 1) * 16), movie->fp);

  for (temp = 0; temp < movie->index_entries * (movie->header->Streams + 1); temp++) {
    awrite(movie, &movie->entries[temp], 1, sizeof(AviIndexEntry), movie->fp, AVI_INDEXE);
  }

  temp = (int)BLI_ftell(movie->fp);

  BLI_fseek(movie->fp, AVI_RIFF_SOFF, SEEK_SET);

  PUT_FCCN((temp - 8L), movie->fp);

  BLI_fseek(movie->fp, movie->movi_offset, SEEK_SET);

  PUT_FCCN((movi_size - (movie->movi_offset + 4L)), movie->fp);

  fclose(movie->fp);

  for (i = 0; i < movie->header->Streams; i++) {
    if (movie->streams && (movie->streams[i].sf != NULL)) {
      MEM_freeN(movie->streams[i].sf);
    }
  }

  MEM_freeN(movie->header);

  if (movie->entries != NULL) {
    MEM_freeN(movie->entries);
  }
  if (movie->streams != NULL) {
    MEM_freeN(movie->streams);
  }
  if (movie->offset_table != NULL) {
    MEM_freeN(movie->offset_table);
  }
  return AVI_ERROR_NONE;
}
