avcodec/mjpegenc_common: Pass MJpegContext for writing picture header

It is the structure that is actually used.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/ljpegenc.c

@@ -238,7 +238,7 @@ static int ljpeg_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
 
     init_put_bits(&pb, pkt->data, pkt->size);
 
-    ff_mjpeg_encode_picture_header(avctx, &pb, &s->scantable,
+    ff_mjpeg_encode_picture_header(avctx, &pb, NULL, &s->scantable,
                                    s->pred, s->matrix, s->matrix);
 
     header_bits = put_bits_count(&pb);

libavcodec/mjpegenc.c

@@ -76,8 +76,9 @@ static av_cold void init_uni_ac_vlc(const uint8_t huff_size_ac[256],
 
 static void mjpeg_encode_picture_header(MpegEncContext *s)
 {
-    ff_mjpeg_encode_picture_header(s->avctx, &s->pb, &s->intra_scantable,
-                                   0, s->intra_matrix, s->chroma_intra_matrix);
+    ff_mjpeg_encode_picture_header(s->avctx, &s->pb, s->mjpeg_ctx,
+                                   &s->intra_scantable, 0,
+                                   s->intra_matrix, s->chroma_intra_matrix);
 
     s->esc_pos = put_bytes_count(&s->pb, 0);
     for (int i = 1; i < s->slice_context_count; i++)

libavcodec/mjpegenc_common.c

@@ -56,6 +56,7 @@ static int put_huffman_table(PutBitContext *p, int table_class, int table_id,
 }
 
 static void jpeg_table_header(AVCodecContext *avctx, PutBitContext *p,
+                              MJpegContext *m,
                               ScanTable *intra_scantable,
                               uint16_t luma_intra_matrix[64],
                               uint16_t chroma_intra_matrix[64],
@@ -63,17 +64,12 @@ static void jpeg_table_header(AVCodecContext *avctx, PutBitContext *p,
 {
     int i, j, size;
     uint8_t *ptr;
-    MpegEncContext *s = NULL;
 
-    /* Since avctx->priv_data will point to LJpegEncContext in this case */
-    if (avctx->codec_id != AV_CODEC_ID_LJPEG)
-        s = avctx->priv_data;
-
-    if (avctx->codec_id != AV_CODEC_ID_LJPEG) {
+    if (m) {
         int matrix_count = 1 + !!memcmp(luma_intra_matrix,
                                         chroma_intra_matrix,
                                         sizeof(luma_intra_matrix[0]) * 64);
-        if (s && s->mjpeg_ctx->force_duplicated_matrix)
+        if (m->force_duplicated_matrix)
             matrix_count = 2;
         /* quant matrixes */
         put_marker(p, DQT);
@@ -110,16 +106,16 @@ static void jpeg_table_header(AVCodecContext *avctx, PutBitContext *p,
 
     // Only MJPEG can have a variable Huffman variable. All other
     // formats use the default Huffman table.
-    if (s && s->mjpeg_ctx->huffman == HUFFMAN_TABLE_OPTIMAL) {
-        size += put_huffman_table(p, 0, 0, s->mjpeg_ctx->bits_dc_luminance,
-                                  s->mjpeg_ctx->val_dc_luminance);
-        size += put_huffman_table(p, 0, 1, s->mjpeg_ctx->bits_dc_chrominance,
-                                  s->mjpeg_ctx->val_dc_chrominance);
-
-        size += put_huffman_table(p, 1, 0, s->mjpeg_ctx->bits_ac_luminance,
-                                  s->mjpeg_ctx->val_ac_luminance);
-        size += put_huffman_table(p, 1, 1, s->mjpeg_ctx->bits_ac_chrominance,
-                                  s->mjpeg_ctx->val_ac_chrominance);
+    if (m && m->huffman == HUFFMAN_TABLE_OPTIMAL) {
+        size += put_huffman_table(p, 0, 0, m->bits_dc_luminance,
+                                  m->val_dc_luminance);
+        size += put_huffman_table(p, 0, 1, m->bits_dc_chrominance,
+                                  m->val_dc_chrominance);
+
+        size += put_huffman_table(p, 1, 0, m->bits_ac_luminance,
+                                  m->val_ac_luminance);
+        size += put_huffman_table(p, 1, 1, m->bits_ac_chrominance,
+                                  m->val_ac_chrominance);
     } else {
         size += put_huffman_table(p, 0, 0, ff_mjpeg_bits_dc_luminance,
                                   ff_mjpeg_val_dc);
@@ -218,11 +214,12 @@ void ff_mjpeg_init_hvsample(AVCodecContext *avctx, int hsample[4], int vsample[4
 }
 
 void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
+                                    MJpegContext *m,
                                     ScanTable *intra_scantable, int pred,
                                     uint16_t luma_intra_matrix[64],
                                     uint16_t chroma_intra_matrix[64])
 {
-    const int lossless = avctx->codec_id != AV_CODEC_ID_MJPEG && avctx->codec_id != AV_CODEC_ID_AMV;
+    const int lossless = !m;
     int hsample[4], vsample[4];
     int components = 3 + (avctx->pix_fmt == AV_PIX_FMT_BGRA);
     int chroma_matrix = !!memcmp(luma_intra_matrix,
@@ -239,7 +236,8 @@ void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
 
     jpeg_put_comments(avctx, pb);
 
-    jpeg_table_header(avctx, pb, intra_scantable, luma_intra_matrix, chroma_intra_matrix, hsample);
+    jpeg_table_header(avctx, pb, m, intra_scantable,
+                      luma_intra_matrix, chroma_intra_matrix, hsample);
 
     switch (avctx->codec_id) {
     case AV_CODEC_ID_MJPEG:  put_marker(pb, SOF0 ); break;

libavcodec/mjpegenc_common.h

@@ -27,7 +27,10 @@
 #include "idctdsp.h"
 #include "put_bits.h"
 
+struct MJpegContext;
+
 void ff_mjpeg_encode_picture_header(AVCodecContext *avctx, PutBitContext *pb,
+                                    struct MJpegContext *m,
                                     ScanTable *intra_scantable, int pred,
                                     uint16_t luma_intra_matrix[64],
                                     uint16_t chroma_intra_matrix[64]);