/*

  * Cinepak encoder (c) 2011 Tomas Härdin

  * http://titan.codemill.se/~tomhar/cinepakenc.patch

  *
  * Fixes and improvements, vintage decoders compatibility
  *  (c) 2013, 2014 Rl, Aetey Global Technologies AB

  *
  * 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.
  */

 /*

  * TODO:
  * - optimize: color space conversion (move conversion to libswscale), ...

  * MAYBE:
  * - "optimally" split the frame into several non-regular areas
  *   using a separate codebook pair for each area and approximating
  *   the area by several rectangular strips (generally not full width ones)
  *   (use quadtree splitting? a simple fixed-granularity grid?)

  */
 

 #include <string.h>
 

 #include "libavutil/avassert.h"

 #include "libavutil/common.h"

 #include "libavutil/internal.h"

 #include "libavutil/intreadwrite.h"
 #include "libavutil/lfg.h"

 #include "libavutil/opt.h"
 

 #include "avcodec.h"

 #include "elbg.h"

 #include "internal.h"
 

 #define CVID_HEADER_SIZE 10
 #define STRIP_HEADER_SIZE 12
 #define CHUNK_HEADER_SIZE 4
 
 #define MB_SIZE 4           //4x4 MBs

 #define MB_AREA (MB_SIZE * MB_SIZE)

 #define VECTOR_MAX     6    // six or four entries per vector depending on format
 #define CODEBOOK_MAX 256    // size of a codebook

 #define MAX_STRIPS  32      // Note: having fewer choices regarding the number of strips speeds up encoding (obviously)
 #define MIN_STRIPS   1      // Note: having more strips speeds up encoding the frame (this is less obvious)

 // MAX_STRIPS limits the maximum quality you can reach

 //            when you want high quality on high resolutions,

 // MIN_STRIPS limits the minimum efficiently encodable bit rate
 //            on low resolutions
 // the numbers are only used for brute force optimization for the first frame,
 // for the following frames they are adaptively readjusted
 // NOTE the decoder in ffmpeg has its own arbitrary limitation on the number
 // of strips, currently 32

 typedef enum CinepakMode {

     MODE_V1_ONLY = 0,
     MODE_V1_V4,
     MODE_MC,
 
     MODE_COUNT,
 } CinepakMode;
 

 typedef enum mb_encoding {

     ENC_V1,
     ENC_V4,

     ENC_SKIP,
 
     ENC_UNCERTAIN

 } mb_encoding;
 

 typedef struct mb_info {

     int v1_vector;              // index into v1 codebook
     int v1_error;               // error when using V1 encoding
     int v4_vector[4];           // indices into v4 codebook
     int v4_error;               // error when using V4 encoding
     int skip_error;             // error when block is skipped (aka copied from last frame)
     mb_encoding best_encoding;  // last result from calculate_mode_score()

 } mb_info;
 

 typedef struct strip_info {

     int v1_codebook[CODEBOOK_MAX * VECTOR_MAX];
     int v4_codebook[CODEBOOK_MAX * VECTOR_MAX];

     int v1_size;
     int v4_size;
     CinepakMode mode;

 } strip_info;
 

 typedef struct CinepakEncContext {

     const AVClass *class;

     AVCodecContext *avctx;

     unsigned char *pict_bufs[4], *strip_buf, *frame_buf;
     AVFrame *last_frame;
     AVFrame *best_frame;
     AVFrame *scratch_frame;
     AVFrame *input_frame;
     enum AVPixelFormat pix_fmt;

     int w, h;

     int frame_buf_size;

     int curframe, keyint;
     AVLFG randctx;
     uint64_t lambda;
     int *codebook_input;
     int *codebook_closest;

     mb_info *mb;                // MB RD state
     int min_strips;             // the current limit
     int max_strips;             // the current limit
     // options

     int max_extra_cb_iterations;
     int skip_empty_cb;
     int min_min_strips;
     int max_max_strips;
     int strip_number_delta_range;

 } CinepakEncContext;
 

 #define OFFSET(x) offsetof(CinepakEncContext, x)
 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {

     { "max_extra_cb_iterations", "Max extra codebook recalculation passes, more is better and slower",
       OFFSET(max_extra_cb_iterations),  AV_OPT_TYPE_INT, { .i64 =          2 },          0, INT_MAX,                 VE },
     { "skip_empty_cb",           "Avoid wasting bytes, ignore vintage MacOS decoder",

       OFFSET(skip_empty_cb),            AV_OPT_TYPE_BOOL, { .i64 =         0 },          0, 1,                       VE },

     { "max_strips",              "Limit strips/frame, vintage compatible is 1..3, otherwise the more the better",
       OFFSET(max_max_strips),           AV_OPT_TYPE_INT, { .i64 =          3 }, MIN_STRIPS, MAX_STRIPS,              VE },
     { "min_strips",              "Enforce min strips/frame, more is worse and faster, must be <= max_strips",
       OFFSET(min_min_strips),           AV_OPT_TYPE_INT, { .i64 = MIN_STRIPS }, MIN_STRIPS, MAX_STRIPS,              VE },
     { "strip_number_adaptivity", "How fast the strip number adapts, more is slightly better, much slower",
       OFFSET(strip_number_delta_range), AV_OPT_TYPE_INT, { .i64 =          0 },          0, MAX_STRIPS - MIN_STRIPS, VE },

     { NULL },
 };
 
 static const AVClass cinepak_class = {
     .class_name = "cinepak",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 

 static av_cold int cinepak_encode_init(AVCodecContext *avctx)
 {
     CinepakEncContext *s = avctx->priv_data;
     int x, mb_count, strip_buf_size, frame_buf_size;
 
     if (avctx->width & 3 || avctx->height & 3) {
         av_log(avctx, AV_LOG_ERROR, "width and height must be multiples of four (got %ix%i)\n",

                avctx->width, avctx->height);

         return AVERROR(EINVAL);
     }
 

     if (s->min_min_strips > s->max_max_strips) {

         av_log(avctx, AV_LOG_ERROR, "minimum number of strips must not exceed maximum (got %i and %i)\n",

                s->min_min_strips, s->max_max_strips);

         return AVERROR(EINVAL);
     }
 

     if (!(s->last_frame = av_frame_alloc()))

         return AVERROR(ENOMEM);

     if (!(s->best_frame = av_frame_alloc()))
         goto enomem;
     if (!(s->scratch_frame = av_frame_alloc()))
         goto enomem;
     if (avctx->pix_fmt == AV_PIX_FMT_RGB24)
         if (!(s->input_frame = av_frame_alloc()))
             goto enomem;
 

     if (!(s->codebook_input = av_malloc_array((avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4) * (avctx->width * avctx->height) >> 2, sizeof(*s->codebook_input))))

         goto enomem;

     if (!(s->codebook_closest = av_malloc_array((avctx->width * avctx->height) >> 2, sizeof(*s->codebook_closest))))

         goto enomem;
 

     for (x = 0; x < (avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 4 : 3); x++)
         if (!(s->pict_bufs[x] = av_malloc((avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4) * (avctx->width * avctx->height) >> 2)))

             goto enomem;
 
     mb_count = avctx->width * avctx->height / MB_AREA;
 

     // the largest possible chunk is 0x31 with all MBs encoded in V4 mode
     // and full codebooks being replaced in INTER mode,

     // which is 34 bits per MB

     // and 2*256 extra flag bits per strip
     strip_buf_size = STRIP_HEADER_SIZE + 3 * CHUNK_HEADER_SIZE + 2 * VECTOR_MAX * CODEBOOK_MAX + 4 * (mb_count + (mb_count + 15) / 16) + (2 * CODEBOOK_MAX) / 8;

     frame_buf_size = CVID_HEADER_SIZE + s->max_max_strips * strip_buf_size;

 
     if (!(s->strip_buf = av_malloc(strip_buf_size)))
         goto enomem;
 
     if (!(s->frame_buf = av_malloc(frame_buf_size)))
         goto enomem;
 

     if (!(s->mb = av_malloc_array(mb_count, sizeof(mb_info))))

         goto enomem;
 
     av_lfg_init(&s->randctx, 1);

     s->avctx          = avctx;
     s->w              = avctx->width;
     s->h              = avctx->height;

     s->frame_buf_size = frame_buf_size;

     s->curframe       = 0;
     s->keyint         = avctx->keyint_min;
     s->pix_fmt        = avctx->pix_fmt;

     // set up AVFrames

     s->last_frame->data[0]        = s->pict_bufs[0];
     s->last_frame->linesize[0]    = s->w;
     s->best_frame->data[0]        = s->pict_bufs[1];
     s->best_frame->linesize[0]    = s->w;
     s->scratch_frame->data[0]     = s->pict_bufs[2];
     s->scratch_frame->linesize[0] = s->w;
 
     if (s->pix_fmt == AV_PIX_FMT_RGB24) {

         s->last_frame->data[1]     = s->last_frame->data[0] +   s->w * s->h;
         s->last_frame->data[2]     = s->last_frame->data[1] + ((s->w * s->h) >> 2);
         s->last_frame->linesize[1] =
         s->last_frame->linesize[2] = s->w >> 1;

         s->best_frame->data[1]     = s->best_frame->data[0] +   s->w * s->h;
         s->best_frame->data[2]     = s->best_frame->data[1] + ((s->w * s->h) >> 2);
         s->best_frame->linesize[1] =
         s->best_frame->linesize[2] = s->w >> 1;

         s->scratch_frame->data[1]     = s->scratch_frame->data[0] +   s->w * s->h;

         s->scratch_frame->data[2]     = s->scratch_frame->data[1] + ((s->w * s->h) >> 2);

         s->scratch_frame->linesize[1] =
         s->scratch_frame->linesize[2] = s->w >> 1;
 
         s->input_frame->data[0]     = s->pict_bufs[3];
         s->input_frame->linesize[0] = s->w;
         s->input_frame->data[1]     = s->input_frame->data[0] +   s->w * s->h;
         s->input_frame->data[2]     = s->input_frame->data[1] + ((s->w * s->h) >> 2);
         s->input_frame->linesize[1] =
         s->input_frame->linesize[2] = s->w >> 1;

     }
 

     s->min_strips = s->min_min_strips;
     s->max_strips = s->max_max_strips;

     return 0;
 
 enomem:

     av_frame_free(&s->last_frame);
     av_frame_free(&s->best_frame);
     av_frame_free(&s->scratch_frame);
     if (avctx->pix_fmt == AV_PIX_FMT_RGB24)
         av_frame_free(&s->input_frame);
     av_freep(&s->codebook_input);
     av_freep(&s->codebook_closest);
     av_freep(&s->strip_buf);
     av_freep(&s->frame_buf);
     av_freep(&s->mb);

     for (x = 0; x < (avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 4 : 3); x++)

         av_freep(&s->pict_bufs[x]);

 
     return AVERROR(ENOMEM);
 }
 

 static int64_t calculate_mode_score(CinepakEncContext *s, int h,
                                     strip_info *info, int report,
                                     int *training_set_v1_shrunk,
                                     int *training_set_v4_shrunk)

 {

     // score = FF_LAMBDA_SCALE * error + lambda * bits

     int x;

     int entry_size = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4;

     int mb_count   = s->w * h / MB_AREA;

     mb_info *mb;
     int64_t score1, score2, score3;

     int64_t ret = s->lambda * ((info->v1_size ? CHUNK_HEADER_SIZE + info->v1_size * entry_size : 0) +

                                (info->v4_size ? CHUNK_HEADER_SIZE + info->v4_size * entry_size : 0) +
                                CHUNK_HEADER_SIZE) << 3;

     switch (info->mode) {

     case MODE_V1_ONLY:

         // one byte per MB

         ret += s->lambda * 8 * mb_count;
 

         // while calculating we assume all blocks are ENC_V1
         for (x = 0; x < mb_count; x++) {
             mb   = &s->mb[x];

             ret += FF_LAMBDA_SCALE * mb->v1_error;

             // this function is never called for report in MODE_V1_ONLY
             // if (!report)

             mb->best_encoding = ENC_V1;
         }
 
         break;
     case MODE_V1_V4:

         // 9 or 33 bits per MB
         if (report) {
             // no moves between the corresponding training sets are allowed

             *training_set_v1_shrunk = *training_set_v4_shrunk = 0;

             for (x = 0; x < mb_count; x++) {

                 int mberr;
                 mb = &s->mb[x];

                 if (mb->best_encoding == ENC_V1)
                     score1 = s->lambda * 9 + FF_LAMBDA_SCALE * (mberr = mb->v1_error);

                 else

                     score1 = s->lambda * 33 + FF_LAMBDA_SCALE * (mberr = mb->v4_error);

                 ret += score1;

             }
         } else { // find best mode per block

             for (x = 0; x < mb_count; x++) {
                 mb     = &s->mb[x];
                 score1 = s->lambda * 9 + FF_LAMBDA_SCALE * mb->v1_error;

                 score2 = s->lambda * 33 + FF_LAMBDA_SCALE * mb->v4_error;
 

                 if (score1 <= score2) {

                     ret += score1;
                     mb->best_encoding = ENC_V1;
                 } else {
                     ret += score2;
                     mb->best_encoding = ENC_V4;
                 }

             }
         }
 
         break;
     case MODE_MC:

         // 1, 10 or 34 bits per MB
         if (report) {

             int v1_shrunk = 0, v4_shrunk = 0;

             for (x = 0; x < mb_count; x++) {

                 mb = &s->mb[x];

                 // it is OK to move blocks to ENC_SKIP here
                 // but not to any codebook encoding!
                 score1 = s->lambda * 1 + FF_LAMBDA_SCALE * mb->skip_error;
                 if (mb->best_encoding == ENC_SKIP) {

                     ret += score1;

                 } else if (mb->best_encoding == ENC_V1) {
                     if ((score2 = s->lambda * 10 + FF_LAMBDA_SCALE * mb->v1_error) >= score1) {

                         mb->best_encoding = ENC_SKIP;
                         ++v1_shrunk;
                         ret += score1;
                     } else {
                         ret += score2;
                     }
                 } else {

                     if ((score3 = s->lambda * 34 + FF_LAMBDA_SCALE * mb->v4_error) >= score1) {

                         mb->best_encoding = ENC_SKIP;
                         ++v4_shrunk;
                         ret += score1;
                     } else {
                         ret += score3;
                     }
                 }
             }
             *training_set_v1_shrunk = v1_shrunk;
             *training_set_v4_shrunk = v4_shrunk;
         } else { // find best mode per block

             for (x = 0; x < mb_count; x++) {
                 mb     = &s->mb[x];
                 score1 = s->lambda * 1 + FF_LAMBDA_SCALE * mb->skip_error;

                 score2 = s->lambda * 10 + FF_LAMBDA_SCALE * mb->v1_error;
                 score3 = s->lambda * 34 + FF_LAMBDA_SCALE * mb->v4_error;
 

                 if (score1 <= score2 && score1 <= score3) {

                     ret += score1;
                     mb->best_encoding = ENC_SKIP;

                 } else if (score2 <= score3) {

                     ret += score2;
                     mb->best_encoding = ENC_V1;
                 } else {
                     ret += score3;
                     mb->best_encoding = ENC_V4;
                 }

             }
         }
 
         break;
     }
 
     return ret;
 }
 
 static int write_chunk_header(unsigned char *buf, int chunk_type, int chunk_size)
 {
     buf[0] = chunk_type;
     AV_WB24(&buf[1], chunk_size + CHUNK_HEADER_SIZE);
     return CHUNK_HEADER_SIZE;
 }
 

 static int encode_codebook(CinepakEncContext *s, int *codebook, int size,
                            int chunk_type_yuv, int chunk_type_gray,
                            unsigned char *buf)

 {

     int x, y, ret, entry_size = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4;
     int incremental_codebook_replacement_mode = 0; // hardcoded here,

     // the compiler should notice that this is a constant -- rl

 
     ret = write_chunk_header(buf,

                              s->pix_fmt == AV_PIX_FMT_RGB24 ?
                              chunk_type_yuv  + (incremental_codebook_replacement_mode ? 1 : 0) :
                              chunk_type_gray + (incremental_codebook_replacement_mode ? 1 : 0),
                              entry_size * size +
                              (incremental_codebook_replacement_mode ? (size + 31) / 32 * 4 : 0));
 
     // we do codebook encoding according to the "intra" mode
     // but we keep the "dead" code for reference in case we will want
     // to use incremental codebook updates (which actually would give us
     // "kind of" motion compensation, especially in 1 strip/frame case) -- rl
     // (of course, the code will be not useful as-is)
     if (incremental_codebook_replacement_mode) {

         int flags = 0;
         int flagsind;

         for (x = 0; x < size; x++) {
             if (flags == 0) {

                 flagsind = ret;

                 ret     += 4;
                 flags    = 0x80000000;

             } else

                 flags = ((flags >> 1) | 0x80000000);
             for (y = 0; y < entry_size; y++)
                 buf[ret++] = codebook[y + x * entry_size] ^ (y >= 4 ? 0x80 : 0);
             if ((flags & 0xffffffff) == 0xffffffff) {

                 AV_WB32(&buf[flagsind], flags);
                 flags = 0;
             }
         }

         if (flags)

             AV_WB32(&buf[flagsind], flags);
     } else

         for (x = 0; x < size; x++)
             for (y = 0; y < entry_size; y++)
                 buf[ret++] = codebook[y + x * entry_size] ^ (y >= 4 ? 0x80 : 0);

 
     return ret;
 }
 

 // sets out to the sub picture starting at (x,y) in in

 static void get_sub_picture(CinepakEncContext *s, int x, int y,
                             uint8_t * in_data[4], int  in_linesize[4],
                             uint8_t *out_data[4], int out_linesize[4])

 {

     out_data[0]     = in_data[0] + x + y * in_linesize[0];

     out_linesize[0] = in_linesize[0];

     if (s->pix_fmt == AV_PIX_FMT_RGB24) {
         out_data[1]     = in_data[1] + (x >> 1) + (y >> 1) * in_linesize[1];

         out_linesize[1] = in_linesize[1];

         out_data[2]     = in_data[2] + (x >> 1) + (y >> 1) * in_linesize[2];

         out_linesize[2] = in_linesize[2];

     }
 }
 

 // decodes the V1 vector in mb into the 4x4 MB pointed to by data

 static void decode_v1_vector(CinepakEncContext *s, uint8_t *data[4],
                              int linesize[4], int v1_vector, strip_info *info)

 {

     int entry_size = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4;

     data[0][0] =

     data[0][1] =
     data[0][    linesize[0]] =
     data[0][1 + linesize[0]] = info->v1_codebook[v1_vector * entry_size];

     data[0][2] =

     data[0][3] =
     data[0][2 + linesize[0]] =
     data[0][3 + linesize[0]] = info->v1_codebook[v1_vector * entry_size + 1];

     data[0][    2 * linesize[0]] =
     data[0][1 + 2 * linesize[0]] =
     data[0][    3 * linesize[0]] =
     data[0][1 + 3 * linesize[0]] = info->v1_codebook[v1_vector * entry_size + 2];

     data[0][2 + 2 * linesize[0]] =
     data[0][3 + 2 * linesize[0]] =
     data[0][2 + 3 * linesize[0]] =
     data[0][3 + 3 * linesize[0]] = info->v1_codebook[v1_vector * entry_size + 3];

     if (s->pix_fmt == AV_PIX_FMT_RGB24) {

         data[1][0] =

         data[1][1] =
         data[1][    linesize[1]] =
         data[1][1 + linesize[1]] = info->v1_codebook[v1_vector * entry_size + 4];

 
         data[2][0] =

         data[2][1] =
         data[2][    linesize[2]] =
         data[2][1 + linesize[2]] = info->v1_codebook[v1_vector * entry_size + 5];

     }
 }
 

 // decodes the V4 vectors in mb into the 4x4 MB pointed to by data

 static void decode_v4_vector(CinepakEncContext *s, uint8_t *data[4],
                              int linesize[4], int *v4_vector, strip_info *info)

 {

     int i, x, y, entry_size = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4;

     for (i = y = 0; y < 4; y += 2) {
         for (x = 0; x < 4; x += 2, i++) {
             data[0][x     +  y      * linesize[0]] = info->v4_codebook[v4_vector[i] * entry_size];
             data[0][x + 1 +  y      * linesize[0]] = info->v4_codebook[v4_vector[i] * entry_size + 1];
             data[0][x     + (y + 1) * linesize[0]] = info->v4_codebook[v4_vector[i] * entry_size + 2];
             data[0][x + 1 + (y + 1) * linesize[0]] = info->v4_codebook[v4_vector[i] * entry_size + 3];

             if (s->pix_fmt == AV_PIX_FMT_RGB24) {
                 data[1][(x >> 1) + (y >> 1) * linesize[1]] = info->v4_codebook[v4_vector[i] * entry_size + 4];
                 data[2][(x >> 1) + (y >> 1) * linesize[2]] = info->v4_codebook[v4_vector[i] * entry_size + 5];

             }
         }
     }
 }
 

 static void copy_mb(CinepakEncContext *s,
                     uint8_t *a_data[4], int a_linesize[4],
                     uint8_t *b_data[4], int b_linesize[4])

 {
     int y, p;
 

     for (y = 0; y < MB_SIZE; y++)
         memcpy(a_data[0] + y * a_linesize[0], b_data[0] + y * b_linesize[0],

                MB_SIZE);
 

     if (s->pix_fmt == AV_PIX_FMT_RGB24) {
         for (p = 1; p <= 2; p++)
             for (y = 0; y < MB_SIZE / 2; y++)
                 memcpy(a_data[p] + y * a_linesize[p],
                        b_data[p] + y * b_linesize[p],
                        MB_SIZE / 2);

     }
 }
 

 static int encode_mode(CinepakEncContext *s, int h,
                        uint8_t *scratch_data[4], int scratch_linesize[4],
                        uint8_t *last_data[4], int last_linesize[4],
                        strip_info *info, unsigned char *buf)

 {

     int x, y, z, bits, temp_size, header_ofs, ret = 0, mb_count = s->w * h / MB_AREA;

     int needs_extra_bit, should_write_temp;

     uint32_t flags;

     unsigned char temp[64]; // 32/2 = 16 V4 blocks at 4 B each -> 64 B

     mb_info *mb;

     uint8_t *sub_scratch_data[4] = { 0 }, *sub_last_data[4] = { 0 };
     int sub_scratch_linesize[4] = { 0 }, sub_last_linesize[4] = { 0 };
 
     // encode codebooks
     ////// MacOS vintage decoder compatibility dictates the presence of
     ////// the codebook chunk even when the codebook is empty - pretty dumb...
     ////// and also the certain order of the codebook chunks -- rl
     if (info->v4_size || !s->skip_empty_cb)

         ret += encode_codebook(s, info->v4_codebook, info->v4_size, 0x20, 0x24, buf + ret);

     if (info->v1_size || !s->skip_empty_cb)

         ret += encode_codebook(s, info->v1_codebook, info->v1_size, 0x22, 0x26, buf + ret);

     // update scratch picture
     for (z = y = 0; y < h; y += MB_SIZE)
         for (x = 0; x < s->w; x += MB_SIZE, z++) {

             mb = &s->mb[z];
 

             get_sub_picture(s, x, y, scratch_data, scratch_linesize,
                             sub_scratch_data, sub_scratch_linesize);

             if (info->mode == MODE_MC && mb->best_encoding == ENC_SKIP) {
                 get_sub_picture(s, x, y, last_data, last_linesize,

                                 sub_last_data, sub_last_linesize);
                 copy_mb(s, sub_scratch_data, sub_scratch_linesize,
                         sub_last_data, sub_last_linesize);

             } else if (info->mode == MODE_V1_ONLY || mb->best_encoding == ENC_V1)

                 decode_v1_vector(s, sub_scratch_data, sub_scratch_linesize,
                                  mb->v1_vector, info);

             else

                 decode_v4_vector(s, sub_scratch_data, sub_scratch_linesize,
                                  mb->v4_vector, info);

         }
 

     switch (info->mode) {

     case MODE_V1_ONLY:
         ret += write_chunk_header(buf + ret, 0x32, mb_count);
 

         for (x = 0; x < mb_count; x++)

             buf[ret++] = s->mb[x].v1_vector;
 
         break;
     case MODE_V1_V4:

         // remember header position

         header_ofs = ret;

         ret       += CHUNK_HEADER_SIZE;

         for (x = 0; x < mb_count; x += 32) {

             flags = 0;

             for (y = x; y < FFMIN(x + 32, mb_count); y++)
                 if (s->mb[y].best_encoding == ENC_V4)

                     flags |= 1U << (31 - y + x);

 
             AV_WB32(&buf[ret], flags);
             ret += 4;
 

             for (y = x; y < FFMIN(x + 32, mb_count); y++) {

                 mb = &s->mb[y];
 

                 if (mb->best_encoding == ENC_V1)

                     buf[ret++] = mb->v1_vector;
                 else

                     for (z = 0; z < 4; z++)

                         buf[ret++] = mb->v4_vector[z];

             }
         }
 
         write_chunk_header(buf + header_ofs, 0x30, ret - header_ofs - CHUNK_HEADER_SIZE);
 
         break;
     case MODE_MC:

         // remember header position

         header_ofs = ret;

         ret       += CHUNK_HEADER_SIZE;
         flags      = bits = temp_size = 0;

         for (x = 0; x < mb_count; x++) {
             mb                = &s->mb[x];

             flags            |= (uint32_t)(mb->best_encoding != ENC_SKIP) << (31 - bits++);

             needs_extra_bit   = 0;

             should_write_temp = 0;
 

             if (mb->best_encoding != ENC_SKIP) {
                 if (bits < 32)

                     flags |= (uint32_t)(mb->best_encoding == ENC_V4) << (31 - bits++);

                 else
                     needs_extra_bit = 1;
             }
 

             if (bits == 32) {

                 AV_WB32(&buf[ret], flags);

                 ret  += 4;

                 flags = bits = 0;
 

                 if (mb->best_encoding == ENC_SKIP || needs_extra_bit) {

                     memcpy(&buf[ret], temp, temp_size);

                     ret      += temp_size;

                     temp_size = 0;
                 } else
                     should_write_temp = 1;
             }
 

             if (needs_extra_bit) {

                 flags = (uint32_t)(mb->best_encoding == ENC_V4) << 31;

                 bits  = 1;

             }
 

             if (mb->best_encoding == ENC_V1)

                 temp[temp_size++] = mb->v1_vector;

             else if (mb->best_encoding == ENC_V4)
                 for (z = 0; z < 4; z++)

                     temp[temp_size++] = mb->v4_vector[z];

             if (should_write_temp) {

                 memcpy(&buf[ret], temp, temp_size);

                 ret      += temp_size;

                 temp_size = 0;
             }
         }
 

         if (bits > 0) {

             AV_WB32(&buf[ret], flags);
             ret += 4;
             memcpy(&buf[ret], temp, temp_size);
             ret += temp_size;
         }
 
         write_chunk_header(buf + header_ofs, 0x31, ret - header_ofs - CHUNK_HEADER_SIZE);
 
         break;
     }
 
     return ret;
 }
 

 // computes distortion of 4x4 MB in b compared to a

 static int compute_mb_distortion(CinepakEncContext *s,
                                  uint8_t *a_data[4], int a_linesize[4],
                                  uint8_t *b_data[4], int b_linesize[4])

 {
     int x, y, p, d, ret = 0;
 

     for (y = 0; y < MB_SIZE; y++)
         for (x = 0; x < MB_SIZE; x++) {
             d = a_data[0][x + y * a_linesize[0]] - b_data[0][x + y * b_linesize[0]];
             ret += d * d;

         }
 

     if (s->pix_fmt == AV_PIX_FMT_RGB24) {
         for (p = 1; p <= 2; p++) {
             for (y = 0; y < MB_SIZE / 2; y++)
                 for (x = 0; x < MB_SIZE / 2; x++) {
                     d = a_data[p][x + y * a_linesize[p]] - b_data[p][x + y * b_linesize[p]];
                     ret += d * d;

                 }
         }
     }
 
     return ret;
 }
 

 // return the possibly adjusted size of the codebook

 #define CERTAIN(x) ((x) != ENC_UNCERTAIN)
 static int quantize(CinepakEncContext *s, int h, uint8_t *data[4],
                     int linesize[4], int v1mode, strip_info *info,

                     mb_encoding encoding)

 {

     int x, y, i, j, k, x2, y2, x3, y3, plane, shift, mbn;

     int entry_size      = s->pix_fmt == AV_PIX_FMT_RGB24 ? 6 : 4;
     int *codebook       = v1mode ? info->v1_codebook : info->v4_codebook;
     int size            = v1mode ? info->v1_size : info->v4_size;

     int64_t total_error = 0;

     uint8_t vq_pict_buf[(MB_AREA * 3) / 2];
     uint8_t     *sub_data[4],     *vq_data[4];

     int      sub_linesize[4],  vq_linesize[4];

     for (mbn = i = y = 0; y < h; y += MB_SIZE) {
         for (x = 0; x < s->w; x += MB_SIZE, ++mbn) {

             int *base;

             if (CERTAIN(encoding)) {
                 // use for the training only the blocks known to be to be encoded [sic:-]
                 if (s->mb[mbn].best_encoding != encoding)
                     continue;

             }
 

             base = s->codebook_input + i * entry_size;
             if (v1mode) {
                 // subsample
                 for (j = y2 = 0; y2 < entry_size; y2 += 2)
                     for (x2 = 0; x2 < 4; x2 += 2, j++) {
                         plane   = y2 < 4 ? 0 : 1 + (x2 >> 1);
                         shift   = y2 < 4 ? 0 : 1;
                         x3      = shift ? 0 : x2;
                         y3      = shift ? 0 : y2;
                         base[j] = (data[plane][((x + x3) >> shift) +      ((y + y3) >> shift)      * linesize[plane]] +
                                    data[plane][((x + x3) >> shift) + 1 +  ((y + y3) >> shift)      * linesize[plane]] +
                                    data[plane][((x + x3) >> shift) +     (((y + y3) >> shift) + 1) * linesize[plane]] +
                                    data[plane][((x + x3) >> shift) + 1 + (((y + y3) >> shift) + 1) * linesize[plane]]) >> 2;

                     }
             } else {

                 // copy
                 for (j = y2 = 0; y2 < MB_SIZE; y2 += 2) {
                     for (x2 = 0; x2 < MB_SIZE; x2 += 2)
                         for (k = 0; k < entry_size; k++, j++) {

                             plane = k >= 4 ? k - 3 : 0;
 

                             if (k >= 4) {
                                 x3 = (x + x2) >> 1;
                                 y3 = (y + y2) >> 1;

                             } else {
                                 x3 = x + x2 + (k & 1);
                                 y3 = y + y2 + (k >> 1);
                             }
 

                             base[j] = data[plane][x3 + y3 * linesize[plane]];

                         }
                 }
             }

             i += v1mode ? 1 : 4;

         }
     }

     if (i == 0) // empty training set, nothing to do

         return 0;

     if (i < size)

         size = i;

     avpriv_init_elbg(s->codebook_input, entry_size, i, codebook, size, 1, s->codebook_closest, &s->randctx);
     avpriv_do_elbg(s->codebook_input, entry_size, i, codebook, size, 1, s->codebook_closest, &s->randctx);

     // set up vq_data, which contains a single MB
     vq_data[0]     = vq_pict_buf;

     vq_linesize[0] = MB_SIZE;

     vq_data[1]     = &vq_pict_buf[MB_AREA];
     vq_data[2]     = vq_data[1] + (MB_AREA >> 2);
     vq_linesize[1] =
     vq_linesize[2] = MB_SIZE >> 1;
 
     // copy indices
     for (i = j = y = 0; y < h; y += MB_SIZE)
         for (x = 0; x < s->w; x += MB_SIZE, j++) {

             mb_info *mb = &s->mb[j];

             // skip uninteresting blocks if we know their preferred encoding
             if (CERTAIN(encoding) && mb->best_encoding != encoding)

                 continue;

             // point sub_data to current MB

             get_sub_picture(s, x, y, data, linesize, sub_data, sub_linesize);

             if (v1mode) {

                 mb->v1_vector = s->codebook_closest[i];
 

                 // fill in vq_data with V1 data

                 decode_v1_vector(s, vq_data, vq_linesize, mb->v1_vector, info);

                 mb->v1_error = compute_mb_distortion(s, sub_data, sub_linesize,
                                                      vq_data, vq_linesize);

                 total_error += mb->v1_error;
             } else {

                 for (k = 0; k < 4; k++)
                     mb->v4_vector[k] = s->codebook_closest[i + k];

                 // fill in vq_data with V4 data

                 decode_v4_vector(s, vq_data, vq_linesize, mb->v4_vector, info);

                 mb->v4_error = compute_mb_distortion(s, sub_data, sub_linesize,
                                                      vq_data, vq_linesize);

                 total_error += mb->v4_error;

             }

             i += v1mode ? 1 : 4;

         }

     // check that we did it right in the beginning of the function

     av_assert0(i >= size); // training set is no smaller than the codebook

     return size;

 }
 

 static void calculate_skip_errors(CinepakEncContext *s, int h,
                                   uint8_t *last_data[4], int last_linesize[4],
                                   uint8_t *data[4], int linesize[4],
                                   strip_info *info)

 {
     int x, y, i;

     uint8_t *sub_last_data    [4], *sub_pict_data    [4];
     int      sub_last_linesize[4],  sub_pict_linesize[4];

     for (i = y = 0; y < h; y += MB_SIZE)
         for (x = 0; x < s->w; x += MB_SIZE, i++) {
             get_sub_picture(s, x, y, last_data, last_linesize,
                             sub_last_data, sub_last_linesize);
             get_sub_picture(s, x, y, data, linesize,
                             sub_pict_data, sub_pict_linesize);
 
             s->mb[i].skip_error =
                 compute_mb_distortion(s,
                                       sub_last_data, sub_last_linesize,
                                       sub_pict_data, sub_pict_linesize);

         }
 }
 

 static void write_strip_header(CinepakEncContext *s, int y, int h, int keyframe,
                                unsigned char *buf, int strip_size)

 {

     // actually we are exclusively using intra strip coding (how much can we win
     // otherwise? how to choose which part of a codebook to update?),
     // keyframes are different only because we disallow ENC_SKIP on them -- rl
     // (besides, the logic here used to be inverted: )
     //    buf[0] = keyframe ? 0x11: 0x10;
     buf[0] = keyframe ? 0x10 : 0x11;

     AV_WB24(&buf[1], strip_size + STRIP_HEADER_SIZE);

     // AV_WB16(&buf[4], y); /* using absolute y values works -- rl */

     AV_WB16(&buf[4], 0); /* using relative values works as well -- rl */

     AV_WB16(&buf[6], 0);

     // AV_WB16(&buf[8], y + h); /* using absolute y values works -- rl */

     AV_WB16(&buf[8], h); /* using relative values works as well -- rl */

     AV_WB16(&buf[10], s->w);
 }
 

 static int rd_strip(CinepakEncContext *s, int y, int h, int keyframe,
                     uint8_t *last_data[4], int last_linesize[4],
                     uint8_t *data[4], int linesize[4],
                     uint8_t *scratch_data[4], int scratch_linesize[4],

                     unsigned char *buf, int64_t *best_score)

 {
     int64_t score = 0;

     int best_size = 0;

     strip_info info;

     // for codebook optimization:

     int v1enough, v1_size, v4enough, v4_size;
     int new_v1_size, new_v4_size;
     int v1shrunk, v4shrunk;

     if (!keyframe)

         calculate_skip_errors(s, h, last_data, last_linesize, data, linesize,
                               &info);

     // try some powers of 4 for the size of the codebooks
     // constraint the v4 codebook to be no bigger than v1 one,
     // (and no less than v1_size/4)
     // thus making v1 preferable and possibly losing small details? should be ok

 #define SMALLEST_CODEBOOK 1

     for (v1enough = 0, v1_size = SMALLEST_CODEBOOK; v1_size <= CODEBOOK_MAX && !v1enough; v1_size <<= 2) {
         for (v4enough = 0, v4_size = 0; v4_size <= v1_size && !v4enough; v4_size = v4_size ? v4_size << 2 : v1_size >= SMALLEST_CODEBOOK << 2 ? v1_size >> 2 : SMALLEST_CODEBOOK) {

             CinepakMode mode;

             // try all modes

             for (mode = 0; mode < MODE_COUNT; mode++) {

                 // don't allow MODE_MC in intra frames
                 if (keyframe && mode == MODE_MC)

                     continue;
 

                 if (mode == MODE_V1_ONLY) {

                     info.v1_size = v1_size;

                     // the size may shrink even before optimizations if the input is short:

                     info.v1_size = quantize(s, h, data, linesize, 1,
                                             &info, ENC_UNCERTAIN);

                     if (info.v1_size < v1_size)
                         // too few eligible blocks, no sense in trying bigger sizes

                         v1enough = 1;
 
                     info.v4_size = 0;
                 } else { // mode != MODE_V1_ONLY
                     // if v4 codebook is empty then only allow V1-only mode

                     if (!v4_size)

                         continue;
 

                     if (mode == MODE_V1_V4) {

                         info.v4_size = v4_size;

                         info.v4_size = quantize(s, h, data, linesize, 0,
                                                 &info, ENC_UNCERTAIN);

                         if (info.v4_size < v4_size)
                             // too few eligible blocks, no sense in trying bigger sizes

                             v4enough = 1;
                     }
                 }

                 info.mode = mode;

                 // choose the best encoding per block, based on current experience

                 score = calculate_mode_score(s, h, &info, 0,

                                              &v1shrunk, &v4shrunk);

                 if (mode != MODE_V1_ONLY) {

                     int extra_iterations_limit = s->max_extra_cb_iterations;

                     // recompute the codebooks, omitting the extra blocks
                     // we assume we _may_ come here with more blocks to encode than before

                     info.v1_size = v1_size;

                     new_v1_size = quantize(s, h, data, linesize, 1, &info, ENC_V1);

                     if (new_v1_size < info.v1_size)

                         info.v1_size = new_v1_size;

                     // we assume we _may_ come here with more blocks to encode than before

                     info.v4_size = v4_size;

                     new_v4_size = quantize(s, h, data, linesize, 0, &info, ENC_V4);

                     if (new_v4_size < info.v4_size)

                         info.v4_size = new_v4_size;

                     // calculate the resulting score
                     // (do not move blocks to codebook encodings now, as some blocks may have
                     // got bigger errors despite a smaller training set - but we do not
                     // ever grow the training sets back)
                     for (;;) {

                         score = calculate_mode_score(s, h, &info, 1,

                                                      &v1shrunk, &v4shrunk);

                         // do we have a reason to reiterate? if so, have we reached the limit?
                         if ((!v1shrunk && !v4shrunk) || !extra_iterations_limit--)
                             break;
                         // recompute the codebooks, omitting the extra blocks
                         if (v1shrunk) {

                             info.v1_size = v1_size;

                             new_v1_size = quantize(s, h, data, linesize, 1, &info, ENC_V1);

                             if (new_v1_size < info.v1_size)

                                 info.v1_size = new_v1_size;
                         }

                         if (v4shrunk) {

                             info.v4_size = v4_size;

                             new_v4_size = quantize(s, h, data, linesize, 0, &info, ENC_V4);

                             if (new_v4_size < info.v4_size)

                                 info.v4_size = new_v4_size;
                         }
                     }
                 }

                 if (best_size == 0 || score < *best_score) {

                     *best_score = score;

                     best_size = encode_mode(s, h,
                                             scratch_data, scratch_linesize,
                                             last_data, last_linesize, &info,
                                             s->strip_buf + STRIP_HEADER_SIZE);

 
                     write_strip_header(s, y, h, keyframe, s->strip_buf, best_size);
                 }
             }
         }
     }
 
     best_size += STRIP_HEADER_SIZE;
     memcpy(buf, s->strip_buf, best_size);
 
     return best_size;
 }
 

 static int write_cvid_header(CinepakEncContext *s, unsigned char *buf,
                              int num_strips, int data_size, int isakeyframe)

 {

     buf[0] = isakeyframe ? 0 : 1;

     AV_WB24(&buf[1], data_size + CVID_HEADER_SIZE);
     AV_WB16(&buf[4], s->w);
     AV_WB16(&buf[6], s->h);
     AV_WB16(&buf[8], num_strips);
 
     return CVID_HEADER_SIZE;
 }
 

 static int rd_frame(CinepakEncContext *s, const AVFrame *frame,
                     int isakeyframe, unsigned char *buf, int buf_size)

 {

     int num_strips, strip, i, y, nexty, size, temp_size, best_size;

     uint8_t *last_data    [4], *data    [4], *scratch_data    [4];
     int      last_linesize[4],  linesize[4],  scratch_linesize[4];

     int64_t best_score = 0, score, score_temp;

     int best_nstrips;

     if (s->pix_fmt == AV_PIX_FMT_RGB24) {

         int x;

         // build a copy of the given frame in the correct colorspace
         for (y = 0; y < s->h; y += 2)
             for (x = 0; x < s->w; x += 2) {
                 uint8_t *ir[2];
                 int32_t r, g, b, rr, gg, bb;
                 ir[0] = frame->data[0] + x * 3 + y * frame->linesize[0];

                 ir[1] = ir[0] + frame->linesize[0];
                 get_sub_picture(s, x, y,
                                 s->input_frame->data, s->input_frame->linesize,
                                 scratch_data, scratch_linesize);

                 r = g = b = 0;

                 for (i = 0; i < 4; ++i) {

                     int i1, i2;

                     i1 = (i & 1);
                     i2 = (i >= 2);
                     rr = ir[i2][i1 * 3 + 0];
                     gg = ir[i2][i1 * 3 + 1];
                     bb = ir[i2][i1 * 3 + 2];
                     r += rr;
                     g += gg;
                     b += bb;
                     // using fixed point arithmetic for portable repeatability, scaling by 2^23
                     // "Y"
                     // rr = 0.2857 * rr + 0.5714 * gg + 0.1429 * bb;
                     rr = (2396625 * rr + 4793251 * gg + 1198732 * bb) >> 23;
                     if (rr < 0)
                         rr = 0;
                     else if (rr > 255)
                         rr = 255;
                     scratch_data[0][i1 + i2 * scratch_linesize[0]] = rr;

                 }

                 // let us scale down as late as possible
                 //                r /= 4; g /= 4; b /= 4;
                 // "U"
                 // rr = -0.1429 * r - 0.2857 * g + 0.4286 * b;
                 rr = (-299683 * r - 599156 * g + 898839 * b) >> 23;
                 if (rr < -128)
                     rr = -128;
                 else if (rr > 127)
                     rr = 127;

                 scratch_data[1][0] = rr + 128; // quantize needs unsigned

                 // "V"
                 // rr = 0.3571 * r - 0.2857 * g - 0.0714 * b;
                 rr = (748893 * r - 599156 * g - 149737 * b) >> 23;
                 if (rr < -128)
                     rr = -128;
                 else if (rr > 127)
                     rr = 127;

                 scratch_data[2][0] = rr + 128; // quantize needs unsigned

             }
     }
 

     // would be nice but quite certainly incompatible with vintage players:

     // support encoding zero strips (meaning skip the whole frame)

     for (num_strips = s->min_strips; num_strips <= s->max_strips && num_strips <= s->h / MB_SIZE; num_strips++) {

         score = 0;

         size  = 0;

         for (y = 0, strip = 1; y < s->h; strip++, y = nexty) {

             int strip_height;

             nexty = strip * s->h / num_strips; // <= s->h

             // make nexty the next multiple of 4 if not already there
             if (nexty & 3)

                 nexty += 4 - (nexty & 3);

             strip_height = nexty - y;

             if (strip_height <= 0) { // can this ever happen?

                 av_log(s->avctx, AV_LOG_INFO, "skipping zero height strip %i of %i\n", strip, num_strips);
                 continue;
             }
 

             if (s->pix_fmt == AV_PIX_FMT_RGB24)

                 get_sub_picture(s, 0, y,
                                 s->input_frame->data, s->input_frame->linesize,
                                 data, linesize);

             else

                 get_sub_picture(s, 0, y,

                                 (uint8_t **)frame->data, (int *)frame->linesize,

                                 data, linesize);
             get_sub_picture(s, 0, y,
                             s->last_frame->data, s->last_frame->linesize,
                             last_data, last_linesize);
             get_sub_picture(s, 0, y,
                             s->scratch_frame->data, s->scratch_frame->linesize,
                             scratch_data, scratch_linesize);
 

             if ((temp_size = rd_strip(s, y, strip_height, isakeyframe,
                                       last_data, last_linesize, data, linesize,
                                       scratch_data, scratch_linesize,
                                       s->frame_buf + size + CVID_HEADER_SIZE,
                                       &score_temp)) < 0)

                 return temp_size;
 
             score += score_temp;
             size += temp_size;
         }
 

         if (best_score == 0 || score < best_score) {

             best_score = score;

             best_size = size + write_cvid_header(s, s->frame_buf, num_strips, size, isakeyframe);

             FFSWAP(AVFrame *, s->best_frame, s->scratch_frame);
             memcpy(buf, s->frame_buf, best_size);
             best_nstrips = num_strips;

         }

         // avoid trying too many strip numbers without a real reason
         // (this makes the processing of the very first frame faster)
         if (num_strips - best_nstrips > 4)

             break;

     }
 

     // let the number of strips slowly adapt to the changes in the contents,
     // compared to full bruteforcing every time this will occasionally lead
     // to some r/d performance loss but makes encoding up to several times faster
     if (!s->strip_number_delta_range) {
         if (best_nstrips == s->max_strips) { // let us try to step up

             s->max_strips = best_nstrips + 1;

             if (s->max_strips >= s->max_max_strips)

                 s->max_strips = s->max_max_strips;
         } else { // try to step down
             s->max_strips = best_nstrips;
         }
         s->min_strips = s->max_strips - 1;

         if (s->min_strips < s->min_min_strips)

             s->min_strips = s->min_min_strips;
     } else {
         s->max_strips = best_nstrips + s->strip_number_delta_range;

         if (s->max_strips >= s->max_max_strips)

             s->max_strips = s->max_max_strips;
         s->min_strips = best_nstrips - s->strip_number_delta_range;

         if (s->min_strips < s->min_min_strips)

             s->min_strips = s->min_min_strips;

     }

 
     return best_size;
 }
 

 static int cinepak_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                                 const AVFrame *frame, int *got_packet)

 {
     CinepakEncContext *s = avctx->priv_data;
     int ret;
 
     s->lambda = frame->quality ? frame->quality - 1 : 2 * FF_LAMBDA_SCALE;
 

     if ((ret = ff_alloc_packet2(avctx, pkt, s->frame_buf_size, 0)) < 0)

         return ret;

     ret       = rd_frame(s, frame, (s->curframe == 0), pkt->data, s->frame_buf_size);

     pkt->size = ret;
     if (s->curframe == 0)
         pkt->flags |= AV_PKT_FLAG_KEY;
     *got_packet = 1;

     FFSWAP(AVFrame *, s->last_frame, s->best_frame);

 
     if (++s->curframe >= s->keyint)
         s->curframe = 0;
 

     return 0;

 }
 
 static av_cold int cinepak_encode_end(AVCodecContext *avctx)
 {
     CinepakEncContext *s = avctx->priv_data;
     int x;
 

     av_frame_free(&s->last_frame);
     av_frame_free(&s->best_frame);
     av_frame_free(&s->scratch_frame);
     if (avctx->pix_fmt == AV_PIX_FMT_RGB24)
         av_frame_free(&s->input_frame);
     av_freep(&s->codebook_input);
     av_freep(&s->codebook_closest);
     av_freep(&s->strip_buf);
     av_freep(&s->frame_buf);
     av_freep(&s->mb);

     for (x = 0; x < (avctx->pix_fmt == AV_PIX_FMT_RGB24 ? 4 : 3); x++)

         av_freep(&s->pict_bufs[x]);

 
     return 0;
 }
 
 AVCodec ff_cinepak_encoder = {

     .name           = "cinepak",

     .long_name      = NULL_IF_CONFIG_SMALL("Cinepak"),

     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_CINEPAK,
     .priv_data_size = sizeof(CinepakEncContext),
     .init           = cinepak_encode_init,
     .encode2        = cinepak_encode_frame,
     .close          = cinepak_encode_end,

     .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_RGB24, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE },

     .priv_class     = &cinepak_class,

 };