avcodec/cyuv: Remove useless private context

It just contains duplicates of values from AVCodecContext
as well as an write-only pointer to said AVCodecContext.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/cyuv.c

@@ -37,22 +37,11 @@
 #include "decode.h"
 #include "libavutil/internal.h"
 
-
-typedef struct CyuvDecodeContext {
-    AVCodecContext *avctx;
-    int width, height;
-} CyuvDecodeContext;
-
 static av_cold int cyuv_decode_init(AVCodecContext *avctx)
 {
-    CyuvDecodeContext *s = avctx->priv_data;
-
-    s->avctx = avctx;
-    s->width = avctx->width;
     /* width needs to be divisible by 4 for this codec to work */
-    if (s->width & 0x3)
+    if (avctx->width & 0x3)
         return AVERROR_INVALIDDATA;
-    s->height = avctx->height;
 
     return 0;
 }
@@ -62,7 +51,6 @@ static int cyuv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
 {
     const uint8_t *buf = avpkt->data;
     int buf_size = avpkt->size;
-    CyuvDecodeContext *s=avctx->priv_data;
 
     unsigned char *y_plane;
     unsigned char *u_plane;
@@ -80,7 +68,7 @@ static int cyuv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
     int stream_ptr;
     unsigned char cur_byte;
     int pixel_groups;
-    int rawsize = s->height * FFALIGN(s->width,2) * 2;
+    int rawsize = avctx->height * FFALIGN(avctx->width,2) * 2;
     int ret;
 
     if (avctx->codec_id == AV_CODEC_ID_AURA) {
@@ -91,13 +79,13 @@ static int cyuv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
      * followed by (height) lines each with 3 bytes to represent groups
      * of 4 pixels. Thus, the total size of the buffer ought to be:
      *    (3 * 16) + height * (width * 3 / 4) */
-    if (buf_size == 48 + s->height * (s->width * 3 / 4)) {
+    if (buf_size == 48 + avctx->height * (avctx->width * 3 / 4)) {
         avctx->pix_fmt = AV_PIX_FMT_YUV411P;
     } else if(buf_size == rawsize ) {
         avctx->pix_fmt = AV_PIX_FMT_UYVY422;
     } else {
         av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n",
-               buf_size, 48 + s->height * (s->width * 3 / 4));
+               buf_size, 48 + avctx->height * (avctx->width * 3 / 4));
         return AVERROR_INVALIDDATA;
     }
 
@@ -112,8 +100,8 @@ static int cyuv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
     v_plane = frame->data[2];
 
     if (buf_size == rawsize) {
-        int linesize = FFALIGN(s->width,2) * 2;
-        y_plane += frame->linesize[0] * s->height;
+        int linesize = FFALIGN(avctx->width, 2) * 2;
+        y_plane += frame->linesize[0] * avctx->height;
         for (stream_ptr = 0; stream_ptr < rawsize; stream_ptr += linesize) {
             y_plane -= frame->linesize[0];
             memcpy(y_plane, buf+stream_ptr, linesize);
@@ -122,10 +110,10 @@ static int cyuv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
 
     /* iterate through each line in the height */
     for (y_ptr = 0, u_ptr = 0, v_ptr = 0;
-         y_ptr < (s->height * frame->linesize[0]);
-         y_ptr += frame->linesize[0] - s->width,
-         u_ptr += frame->linesize[1] - s->width / 4,
-         v_ptr += frame->linesize[2] - s->width / 4) {
+         y_ptr < (avctx->height * frame->linesize[0]);
+         y_ptr += frame->linesize[0] - avctx->width,
+         u_ptr += frame->linesize[1] - avctx->width / 4,
+         v_ptr += frame->linesize[2] - avctx->width / 4) {
 
         /* reset predictors */
         cur_byte = buf[stream_ptr++];
@@ -144,7 +132,7 @@ static int cyuv_decode_frame(AVCodecContext *avctx, AVFrame *frame,
         y_plane[y_ptr++] = y_pred;
 
         /* iterate through the remaining pixel groups (4 pixels/group) */
-        pixel_groups = s->width / 4 - 1;
+        pixel_groups = avctx->width / 4 - 1;
         while (pixel_groups--) {
 
             cur_byte = buf[stream_ptr++];
@@ -180,7 +168,6 @@ const FFCodec ff_aura_decoder = {
     CODEC_LONG_NAME("Auravision AURA"),
     .p.type         = AVMEDIA_TYPE_VIDEO,
     .p.id           = AV_CODEC_ID_AURA,
-    .priv_data_size = sizeof(CyuvDecodeContext),
     .init           = cyuv_decode_init,
     FF_CODEC_DECODE_CB(cyuv_decode_frame),
     .p.capabilities = AV_CODEC_CAP_DR1,
@@ -193,7 +180,6 @@ const FFCodec ff_cyuv_decoder = {
     CODEC_LONG_NAME("Creative YUV (CYUV)"),
     .p.type         = AVMEDIA_TYPE_VIDEO,
     .p.id           = AV_CODEC_ID_CYUV,
-    .priv_data_size = sizeof(CyuvDecodeContext),
     .init           = cyuv_decode_init,
     FF_CODEC_DECODE_CB(cyuv_decode_frame),
     .p.capabilities = AV_CODEC_CAP_DR1,