From 2d722b6638a1b925d7e9e01e45611c450bfcf7ee Mon Sep 17 00:00:00 2001
From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Date: Thu, 4 Aug 2022 11:23:01 +0200
Subject: avcodec/cbs_jpeg: Use table-based alloc/free

cbs_jpeg was the last user of CBS that didn't use
CodedBitstreamUnitTypeDescriptors.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/cbs_internal.h |  7 +++++
 libavcodec/cbs_jpeg.c     | 76 +++++++++++++++++------------------------------
 2 files changed, 34 insertions(+), 49 deletions(-)

diff --git a/libavcodec/cbs_internal.h b/libavcodec/cbs_internal.h
index 4030b76f1c..5ccba3c901 100644
--- a/libavcodec/cbs_internal.h
+++ b/libavcodec/cbs_internal.h
@@ -197,6 +197,13 @@ int ff_cbs_write_signed(CodedBitstreamContext *ctx, PutBitContext *pbc,
         .content_type   = CBS_CONTENT_TYPE_POD, \
         .content_size   = sizeof(structure), \
     }
+#define CBS_UNIT_RANGE_POD(range_start, range_end, structure) { \
+        .nb_unit_types         = CBS_UNIT_TYPE_RANGE, \
+        .unit_type.range.start = range_start, \
+        .unit_type.range.end   = range_end, \
+        .content_type          = CBS_CONTENT_TYPE_POD, \
+        .content_size          = sizeof(structure), \
+    }
 
 #define CBS_UNIT_TYPES_INTERNAL_REF(types, structure, ref_field) { \
         .nb_unit_types  = FF_ARRAY_ELEMS((CodedBitstreamUnitType[])TYPE_LIST types), \
diff --git a/libavcodec/cbs_jpeg.c b/libavcodec/cbs_jpeg.c
index da7ee808cf..2afeecfa79 100644
--- a/libavcodec/cbs_jpeg.c
+++ b/libavcodec/cbs_jpeg.c
@@ -82,27 +82,6 @@
 #undef xu
 
 
-static void cbs_jpeg_free_application_data(void *opaque, uint8_t *content)
-{
-    JPEGRawApplicationData *ad = (JPEGRawApplicationData*)content;
-    av_buffer_unref(&ad->Ap_ref);
-    av_freep(&content);
-}
-
-static void cbs_jpeg_free_comment(void *opaque, uint8_t *content)
-{
-    JPEGRawComment *comment = (JPEGRawComment*)content;
-    av_buffer_unref(&comment->Cm_ref);
-    av_freep(&content);
-}
-
-static void cbs_jpeg_free_scan(void *opaque, uint8_t *content)
-{
-    JPEGRawScan *scan = (JPEGRawScan*)content;
-    av_buffer_unref(&scan->data_ref);
-    av_freep(&content);
-}
-
 static int cbs_jpeg_split_fragment(CodedBitstreamContext *ctx,
                                    CodedBitstreamFragment *frag,
                                    int header)
@@ -248,41 +227,26 @@ static int cbs_jpeg_read_unit(CodedBitstreamContext *ctx,
     if (err < 0)
         return err;
 
+    err = ff_cbs_alloc_unit_content2(ctx, unit);
+    if (err < 0)
+        return err;
+
     if (unit->type >= JPEG_MARKER_SOF0 &&
         unit->type <= JPEG_MARKER_SOF3) {
-        err = ff_cbs_alloc_unit_content(unit,
-                                        sizeof(JPEGRawFrameHeader),
-                                        NULL);
-        if (err < 0)
-            return err;
-
         err = cbs_jpeg_read_frame_header(ctx, &gbc, unit->content);
         if (err < 0)
             return err;
 
     } else if (unit->type >= JPEG_MARKER_APPN &&
                unit->type <= JPEG_MARKER_APPN + 15) {
-        err = ff_cbs_alloc_unit_content(unit,
-                                        sizeof(JPEGRawApplicationData),
-                                        &cbs_jpeg_free_application_data);
-        if (err < 0)
-            return err;
-
         err = cbs_jpeg_read_application_data(ctx, &gbc, unit->content);
         if (err < 0)
             return err;
 
     } else if (unit->type == JPEG_MARKER_SOS) {
-        JPEGRawScan *scan;
+        JPEGRawScan *scan = unit->content;
         int pos;
 
-        err = ff_cbs_alloc_unit_content(unit,
-                                        sizeof(JPEGRawScan),
-                                        &cbs_jpeg_free_scan);
-        if (err < 0)
-            return err;
-        scan = unit->content;
-
         err = cbs_jpeg_read_scan_header(ctx, &gbc, &scan->header);
         if (err < 0)
             return err;
@@ -299,21 +263,17 @@ static int cbs_jpeg_read_unit(CodedBitstreamContext *ctx,
 
     } else {
         switch (unit->type) {
-#define SEGMENT(marker, type, func, free) \
+#define SEGMENT(marker, func) \
         case JPEG_MARKER_ ## marker: \
             { \
-                err = ff_cbs_alloc_unit_content(unit, \
-                                                sizeof(type), free); \
-                if (err < 0) \
-                    return err; \
                 err = cbs_jpeg_read_ ## func(ctx, &gbc, unit->content); \
                 if (err < 0) \
                     return err; \
             } \
             break
-            SEGMENT(DQT, JPEGRawQuantisationTableSpecification, dqt, NULL);
-            SEGMENT(DHT, JPEGRawHuffmanTableSpecification,      dht, NULL);
-            SEGMENT(COM, JPEGRawComment,  comment, &cbs_jpeg_free_comment);
+            SEGMENT(DQT, dqt);
+            SEGMENT(DHT, dht);
+            SEGMENT(COM, comment);
 #undef SEGMENT
         default:
             return AVERROR(ENOSYS);
@@ -456,9 +416,27 @@ static int cbs_jpeg_assemble_fragment(CodedBitstreamContext *ctx,
     return 0;
 }
 
+static const CodedBitstreamUnitTypeDescriptor cbs_jpeg_unit_types[] = {
+    CBS_UNIT_RANGE_POD(JPEG_MARKER_SOF0, JPEG_MARKER_SOF3, JPEGRawFrameHeader),
+
+    CBS_UNIT_RANGE_INTERNAL_REF(JPEG_MARKER_APPN, JPEG_MARKER_APPN + 15,
+                                JPEGRawApplicationData, Ap),
+
+    CBS_UNIT_TYPE_INTERNAL_REF(JPEG_MARKER_SOS, JPEGRawScan, data),
+
+    CBS_UNIT_TYPE_POD(JPEG_MARKER_DQT, JPEGRawQuantisationTableSpecification),
+    CBS_UNIT_TYPE_POD(JPEG_MARKER_DHT, JPEGRawHuffmanTableSpecification),
+
+    CBS_UNIT_TYPE_INTERNAL_REF(JPEG_MARKER_COM, JPEGRawComment, Cm),
+
+    CBS_UNIT_TYPE_END_OF_LIST
+};
+
 const CodedBitstreamType ff_cbs_type_jpeg = {
     .codec_id          = AV_CODEC_ID_MJPEG,
 
+    .unit_types        = cbs_jpeg_unit_types,
+
     .split_fragment    = &cbs_jpeg_split_fragment,
     .read_unit         = &cbs_jpeg_read_unit,
     .write_unit        = &cbs_jpeg_write_unit,
-- 
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