yuv4mpegdec: do not set coded_frame properties

coded_frame is not meant to be changed from outside of lavc, and is not
used for decoding.
Set AVCodecContext.field_order instead.

libavformat/yuv4mpegdec.c

@@ -27,11 +27,6 @@
 #define MAX_YUV4_HEADER 80
 #define MAX_FRAME_HEADER 80
 
-struct frame_attributes {
-    int interlaced_frame;
-    int top_field_first;
-};
-
 static int yuv4_read_header(AVFormatContext *s)
 {
     char header[MAX_YUV4_HEADER + 10];  // Include headroom for
@@ -44,7 +39,7 @@ static int yuv4_read_header(AVFormatContext *s)
     enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
     enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
     AVStream *st;
-    struct frame_attributes *s1 = s->priv_data;
+    enum AVFieldOrder field_order;
 
     for (i = 0; i < MAX_YUV4_HEADER; i++) {
         header[i] = avio_r8(pb);
@@ -60,8 +55,6 @@ static int yuv4_read_header(AVFormatContext *s)
     if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
         return -1;
 
-    s1->interlaced_frame = 0;
-    s1->top_field_first = 0;
     header_end = &header[i + 1]; // Include space
     for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
          tokstart < header_end; tokstart++) {
@@ -112,17 +105,16 @@ static int yuv4_read_header(AVFormatContext *s)
         case 'I': // Interlace type
             switch (*tokstart++){
             case '?':
+                field_order = AV_FIELD_UNKNOWN;
                 break;
             case 'p':
-                s1->interlaced_frame = 0;
+                field_order = AV_FIELD_PROGRESSIVE;
                 break;
             case 't':
-                s1->interlaced_frame = 1;
-                s1->top_field_first = 1;
+                field_order = AV_FIELD_TT;
                 break;
             case 'b':
-                s1->interlaced_frame = 1;
-                s1->top_field_first = 0;
+                field_order = AV_FIELD_BB;
                 break;
             case 'm':
                 av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
@@ -202,6 +194,7 @@ static int yuv4_read_header(AVFormatContext *s)
     st->codec->codec_id               = AV_CODEC_ID_RAWVIDEO;
     st->sample_aspect_ratio           = (AVRational){ aspectn, aspectd };
     st->codec->chroma_sample_location = chroma_sample_location;
+    st->codec->field_order            = field_order;
 
     return 0;
 }
@@ -212,7 +205,6 @@ static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
     char header[MAX_FRAME_HEADER+1];
     int packet_size, width, height, ret;
     AVStream *st = s->streams[0];
-    struct frame_attributes *s1 = s->priv_data;
 
     for (i = 0; i < MAX_FRAME_HEADER; i++) {
         header[i] = avio_r8(s->pb);
@@ -244,11 +236,6 @@ static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
     else if (ret != packet_size)
         return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
 
-    if (st->codec->coded_frame) {
-        st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
-        st->codec->coded_frame->top_field_first  = s1->top_field_first;
-    }
-
     pkt->stream_index = 0;
     return 0;
 }
@@ -265,7 +252,6 @@ static int yuv4_probe(AVProbeData *pd)
 AVInputFormat ff_yuv4mpegpipe_demuxer = {
     .name           = "yuv4mpegpipe",
     .long_name      = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
-    .priv_data_size = sizeof(struct frame_attributes),
     .read_probe     = yuv4_probe,
     .read_header    = yuv4_read_header,
     .read_packet    = yuv4_read_packet,