hevc: support luma bit depth != chroma bit depth for PCM coding units

Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/hevc.c

@@ -1420,7 +1420,7 @@ static int hls_pcm_sample(HEVCContext *s, int x0, int y0, int log2_cb_size)
     int   stride2 = s->frame->linesize[2];
     uint8_t *dst2 = &s->frame->data[2][(y0 >> s->sps->vshift[2]) * stride2 + ((x0 >> s->sps->hshift[2]) << s->sps->pixel_shift)];
 
-    int length         = cb_size * cb_size * s->sps->pcm.bit_depth + ((cb_size * cb_size) >> 1) * s->sps->pcm.bit_depth;
+    int length         = cb_size * cb_size * s->sps->pcm.bit_depth + ((cb_size * cb_size) >> 1) * s->sps->pcm.bit_depth_chroma;
     const uint8_t *pcm = skip_bytes(&s->HEVClc.cc, (length + 7) >> 3);
     int ret;
 
@@ -1433,8 +1433,8 @@ static int hls_pcm_sample(HEVCContext *s, int x0, int y0, int log2_cb_size)
         return ret;
 
     s->hevcdsp.put_pcm(dst0, stride0, cb_size,     &gb, s->sps->pcm.bit_depth);
-    s->hevcdsp.put_pcm(dst1, stride1, cb_size / 2, &gb, s->sps->pcm.bit_depth);
-    s->hevcdsp.put_pcm(dst2, stride2, cb_size / 2, &gb, s->sps->pcm.bit_depth);
+    s->hevcdsp.put_pcm(dst1, stride1, cb_size / 2, &gb, s->sps->pcm.bit_depth_chroma);
+    s->hevcdsp.put_pcm(dst2, stride2, cb_size / 2, &gb, s->sps->pcm.bit_depth_chroma);
     return 0;
 }
 

libavcodec/hevc.h

@@ -419,6 +419,7 @@ typedef struct HEVCSPS {
 
     struct {
         uint8_t bit_depth;
+        uint8_t bit_depth_chroma;
         unsigned int log2_min_pcm_cb_size;
         unsigned int log2_max_pcm_cb_size;
         uint8_t loop_filter_disable_flag;

libavcodec/hevc_ps.c

@@ -799,18 +799,8 @@ int ff_hevc_decode_nal_sps(HEVCContext *s)
 
     sps->pcm_enabled_flag = get_bits1(gb);
     if (sps->pcm_enabled_flag) {
-        int pcm_bit_depth_chroma;
         sps->pcm.bit_depth   = get_bits(gb, 4) + 1;
-        pcm_bit_depth_chroma = get_bits(gb, 4) + 1;
-        if (pcm_bit_depth_chroma != sps->pcm.bit_depth) {
-            av_log(s->avctx, AV_LOG_ERROR,
-                   "PCM Luma bit depth (%d) is different from PCM chroma"
-                   "bit depth (%d), this is unsupported.\n",
-                   sps->pcm.bit_depth, pcm_bit_depth_chroma);
-            ret = AVERROR_INVALIDDATA;
-            goto err;
-        }
-
+        sps->pcm.bit_depth_chroma = get_bits(gb, 4) + 1;
         sps->pcm.log2_min_pcm_cb_size = get_ue_golomb_long(gb) + 3;
         sps->pcm.log2_max_pcm_cb_size = sps->pcm.log2_min_pcm_cb_size +
                                         get_ue_golomb_long(gb);