avformat/avc, mxfenc: Avoid allocation of H264 SPS structure, fix memleak

Up until now, ff_avc_decode_sps would parse a SPS and return some
properties from it in a freshly allocated structure. Yet said structure
is very small and completely internal to libavformat, so there is no
reason to use the heap for it. This commit therefore changes the
function to return an int and to modify a caller-provided structure.
This will also allow ff_avc_decode_sps to return better error codes in
the future.

It also fixes a memleak in mxfenc: If a packet contained multiple SPS,
only the SPS structure belonging to the last SPS would be freed, the
other ones would leak when the pointer is overwritten to point to the
new SPS structure. Of course, without allocations there are no leaks.
This is Coverity issue #1445194.

Furthermore, the SPS structure has been renamed from
H264SequenceParameterSet to H264SPS in order to avoid overlong lines.

Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

1 files changed, 12 insertions, 15 deletions

diff --git a/libavformat/avc.c b/libavformat/avc.c
index 975d37ae82..b5e2921388 100644
--- a/libavformat/avc.c
+++ b/libavformat/avc.c
@@ -196,18 +196,17 @@ int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
     avio_write(pb, pps, pps_size);
 
     if (sps[3] != 66 && sps[3] != 77 && sps[3] != 88) {
-        H264SequenceParameterSet *seq = ff_avc_decode_sps(sps + 3, sps_size - 3);
-        if (!seq) {
-            ret = AVERROR(ENOMEM);
+        H264SPS seq;
+        ret = ff_avc_decode_sps(&seq, sps + 3, sps_size - 3);
+        if (ret < 0)
             goto fail;
-        }
-        avio_w8(pb, 0xfc | seq->chroma_format_idc); /* 6 bits reserved (111111) + chroma_format_idc */
-        avio_w8(pb, 0xf8 | (seq->bit_depth_luma - 8)); /* 5 bits reserved (11111) + bit_depth_luma_minus8 */
-        avio_w8(pb, 0xf8 | (seq->bit_depth_chroma - 8)); /* 5 bits reserved (11111) + bit_depth_chroma_minus8 */
+
+        avio_w8(pb, 0xfc |  seq.chroma_format_idc); /* 6 bits reserved (111111) + chroma_format_idc */
+        avio_w8(pb, 0xf8 | (seq.bit_depth_luma - 8)); /* 5 bits reserved (11111) + bit_depth_luma_minus8 */
+        avio_w8(pb, 0xf8 | (seq.bit_depth_chroma - 8)); /* 5 bits reserved (11111) + bit_depth_chroma_minus8 */
         avio_w8(pb, nb_sps_ext); /* number of sps ext */
         if (nb_sps_ext)
             avio_write(pb, sps_ext, sps_ext_size);
-        av_free(seq);
     }
 
 fail:
@@ -332,27 +331,24 @@ static inline int get_se_golomb(GetBitContext *gb) {
     return ((v >> 1) ^ sign) - sign;
 }
 
-H264SequenceParameterSet *ff_avc_decode_sps(const uint8_t *buf, int buf_size)
+int ff_avc_decode_sps(H264SPS *sps, const uint8_t *buf, int buf_size)
 {
     int i, j, ret, rbsp_size, aspect_ratio_idc, pic_order_cnt_type;
     int num_ref_frames_in_pic_order_cnt_cycle;
     int delta_scale, lastScale = 8, nextScale = 8;
     int sizeOfScalingList;
-    H264SequenceParameterSet *sps = NULL;
     GetBitContext gb;
     uint8_t *rbsp_buf;
 
     rbsp_buf = ff_nal_unit_extract_rbsp(buf, buf_size, &rbsp_size, 0);
     if (!rbsp_buf)
-        return NULL;
+        return AVERROR(ENOMEM);
 
     ret = init_get_bits8(&gb, rbsp_buf, rbsp_size);
     if (ret < 0)
         goto end;
 
-    sps = av_mallocz(sizeof(*sps));
-    if (!sps)
-        goto end;
+    memset(sps, 0, sizeof(*sps));
 
     sps->profile_idc = get_bits(&gb, 8);
     sps->constraint_set_flags |= get_bits1(&gb) << 0; // constraint_set0_flag
@@ -448,7 +444,8 @@ H264SequenceParameterSet *ff_avc_decode_sps(const uint8_t *buf, int buf_size)
         sps->sar.den = 1;
     }
 
+    ret = 0;
  end:
     av_free(rbsp_buf);
-    return sps;
+    return ret;
 }