Replace some occurrences of -1 with PIX_FMT_NONE.

Fixes icc warning #188: enumerated type mixed with another type

Originally committed as revision 13130 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/8bps.c

@@ -37,7 +37,7 @@
 #include "avcodec.h"
 
 
-static const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGB32, -1};
+static const enum PixelFormat pixfmt_rgb24[] = {PIX_FMT_BGR24, PIX_FMT_RGB32, PIX_FMT_NONE};
 
 /*
  * Decoder context

libavcodec/asv1.c

@@ -639,7 +639,7 @@ AVCodec asv1_encoder = {
     encode_init,
     encode_frame,
     //encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "ASUS V1",
 };
 
@@ -651,7 +651,7 @@ AVCodec asv2_encoder = {
     encode_init,
     encode_frame,
     //encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "ASUS V2",
 };
 

libavcodec/bmpenc.c

@@ -94,6 +94,6 @@ AVCodec bmp_encoder = {
     bmp_encode_init,
     bmp_encode_frame,
     NULL, //encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_NONE},
     .long_name = "BMP image",
 };

libavcodec/dv.c

@@ -1239,7 +1239,7 @@ AVCodec dvvideo_encoder = {
     sizeof(DVVideoContext),
     dvvideo_init,
     dvvideo_encode_frame,
-    .pix_fmts = (enum PixelFormat[]) {PIX_FMT_YUV411P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, -1},
+    .pix_fmts = (enum PixelFormat[]) {PIX_FMT_YUV411P, PIX_FMT_YUV422P, PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name = "DV (Digital Video)",
 };
 #endif // CONFIG_DVVIDEO_ENCODER

libavcodec/ffv1.c

@@ -1035,7 +1035,7 @@ AVCodec ffv1_encoder = {
     encode_init,
     encode_frame,
     common_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV411P, PIX_FMT_YUV410P, PIX_FMT_RGB32, PIX_FMT_NONE},
     .long_name= "FFmpeg codec #1",
 };
 #endif

libavcodec/flashsv.c

@@ -254,6 +254,6 @@ AVCodec flashsv_decoder = {
     flashsv_decode_end,
     flashsv_decode_frame,
     CODEC_CAP_DR1,
-    .pix_fmts = (enum PixelFormat[]){PIX_FMT_BGR24, -1},
+    .pix_fmts = (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_NONE},
     .long_name = "Flash Screen Video v1",
 };

libavcodec/flashsvenc.c

@@ -292,7 +292,7 @@ AVCodec flashsv_encoder = {
     flashsv_encode_init,
     flashsv_encode_frame,
     flashsv_encode_end,
-    .pix_fmts = (enum PixelFormat[]){PIX_FMT_BGR24, -1},
+    .pix_fmts = (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_NONE},
     .long_name = "Flash Screen Video",
 };
 

libavcodec/gif.c

@@ -340,6 +340,6 @@ AVCodec gif_encoder = {
     gif_encode_init,
     gif_encode_frame,
     NULL, //encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_PAL8, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_PAL8, PIX_FMT_NONE},
     .long_name= "GIF (Graphics Interchange Format)",
 };

libavcodec/h261enc.c

@@ -329,7 +329,7 @@ AVCodec h261_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "H.261",
 };
 

libavcodec/huffyuv.c

@@ -1473,7 +1473,7 @@ AVCodec huffyuv_encoder = {
     encode_init,
     encode_frame,
     encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV422P, PIX_FMT_RGB32, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},
     .long_name = "Huffyuv / HuffYUV",
 };
 
@@ -1485,7 +1485,7 @@ AVCodec ffvhuff_encoder = {
     encode_init,
     encode_frame,
     encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_RGB32, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_RGB32, PIX_FMT_NONE},
     .long_name = "Huffyuv FFmpeg variant",
 };
 

libavcodec/jpeglsenc.c

@@ -389,6 +389,6 @@ AVCodec jpegls_encoder = { //FIXME avoid MPV_* lossless JPEG should not need the
     encode_init_ls,
     encode_picture_ls,
     NULL,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB24, PIX_FMT_GRAY8, PIX_FMT_GRAY16, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB24, PIX_FMT_GRAY8, PIX_FMT_GRAY16, PIX_FMT_NONE},
     .long_name= "JPEG-LS",
 };

libavcodec/libschroedingerenc.c

@@ -383,5 +383,5 @@ AVCodec libschroedinger_encoder = {
     libschroedinger_encode_frame,
     libschroedinger_encode_close,
    .capabilities= CODEC_CAP_DELAY,
-   .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, -1},
+   .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_NONE},
 };

libavcodec/libtheoraenc.c

@@ -264,7 +264,7 @@ static int encode_close(AVCodecContext* avc_context)
     return -1;
 }
 
-static const enum PixelFormat supported_pixel_formats[] = { PIX_FMT_YUV420P, -1 };
+static const enum PixelFormat supported_pixel_formats[] = { PIX_FMT_YUV420P, PIX_FMT_NONE };
 
 /*! AVCodec struct exposed to libavcodec */
 AVCodec libtheora_encoder =

libavcodec/libx264.c

@@ -296,6 +296,6 @@ AVCodec libx264_encoder = {
     .encode = X264_frame,
     .close = X264_close,
     .capabilities = CODEC_CAP_DELAY,
-    .pix_fmts = (enum PixelFormat[]) { PIX_FMT_YUV420P, -1 },
+    .pix_fmts = (enum PixelFormat[]) { PIX_FMT_YUV420P, PIX_FMT_NONE },
     .long_name = "libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
 };

libavcodec/libxvidff.c

@@ -773,6 +773,6 @@ AVCodec libxvid_encoder = {
     ff_xvid_encode_init,
     ff_xvid_encode_frame,
     ff_xvid_encode_close,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "libxvidcore MPEG-4 part 2",
 };

libavcodec/mjpegenc.c

@@ -454,6 +454,6 @@ AVCodec mjpeg_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_NONE},
     .long_name= "MJPEG (Motion JPEG)",
 };

libavcodec/mpeg12.c

@@ -70,13 +70,13 @@ extern int XVMC_field_end(MpegEncContext *s);
 extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp);
 extern void XVMC_init_block(MpegEncContext *s);//set s->block
 
-static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1};
-static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1};
-static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1};
+static const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,PIX_FMT_NONE};
+static const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,PIX_FMT_NONE};
+static const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,PIX_FMT_NONE};
 static const enum PixelFormat pixfmt_xvmc_mpg2_420[] = {
                                            PIX_FMT_XVMC_MPEG2_IDCT,
                                            PIX_FMT_XVMC_MPEG2_MC,
-                                           -1};
+                                           PIX_FMT_NONE};
 
 uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
 

libavcodec/mpeg12enc.c

@@ -936,7 +936,7 @@ AVCodec mpeg1video_encoder = {
     MPV_encode_picture,
     MPV_encode_end,
     .supported_framerates= ff_frame_rate_tab+1,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .capabilities= CODEC_CAP_DELAY,
     .long_name= "MPEG-1 video",
 };
@@ -950,7 +950,7 @@ AVCodec mpeg2video_encoder = {
     MPV_encode_picture,
     MPV_encode_end,
     .supported_framerates= ff_frame_rate_tab+1,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE},
     .capabilities= CODEC_CAP_DELAY,
     .long_name= "MPEG-2 video",
 };

libavcodec/mpegvideo_enc.c

@@ -3743,7 +3743,7 @@ AVCodec h263_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "H.263",
 };
 
@@ -3755,7 +3755,7 @@ AVCodec h263p_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "H.263+ / H.263 version 2",
 };
 
@@ -3767,7 +3767,7 @@ AVCodec flv_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "Flash Video",
 };
 
@@ -3779,7 +3779,7 @@ AVCodec rv10_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "RealVideo 1.0",
 };
 
@@ -3791,7 +3791,7 @@ AVCodec rv20_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "RealVideo 2.0",
 };
 
@@ -3803,7 +3803,7 @@ AVCodec mpeg4_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .capabilities= CODEC_CAP_DELAY,
     .long_name= "MPEG-4 part 2",
 };
@@ -3816,7 +3816,7 @@ AVCodec msmpeg4v1_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "MPEG-4 part 2 Microsoft variant version 1",
 };
 
@@ -3828,7 +3828,7 @@ AVCodec msmpeg4v2_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "MPEG-4 part 2 Microsoft variant version 2",
 };
 
@@ -3840,7 +3840,7 @@ AVCodec msmpeg4v3_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "MPEG-4 part 2 Microsoft variant version 3",
 };
 
@@ -3852,6 +3852,6 @@ AVCodec wmv1_encoder = {
     MPV_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "Windows Media Video 7",
 };

libavcodec/pngenc.c

@@ -444,6 +444,6 @@ AVCodec png_encoder = {
     png_enc_init,
     encode_frame,
     NULL, //encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_PAL8, PIX_FMT_GRAY8, PIX_FMT_MONOBLACK, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_PAL8, PIX_FMT_GRAY8, PIX_FMT_MONOBLACK, PIX_FMT_NONE},
     .long_name= "PNG image",
 };

libavcodec/pnmenc.c

@@ -364,7 +364,7 @@ AVCodec pgm_encoder = {
     pnm_encode_frame,
     NULL, //encode_end,
     pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_GRAY8, PIX_FMT_GRAY16BE, PIX_FMT_NONE},
     .long_name= "PGM (Portable GrayMap) image",
 };
 #endif // CONFIG_PGM_ENCODER
@@ -379,7 +379,7 @@ AVCodec pgmyuv_encoder = {
     pnm_encode_frame,
     NULL, //encode_end,
     pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "PGMYUV (Portable GrayMap YUV) image",
 };
 #endif // CONFIG_PGMYUV_ENCODER
@@ -394,7 +394,7 @@ AVCodec ppm_encoder = {
     pnm_encode_frame,
     NULL, //encode_end,
     pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_NONE},
     .long_name= "PPM (Portable PixelMap) image",
 };
 #endif // CONFIG_PPM_ENCODER
@@ -409,7 +409,7 @@ AVCodec pbm_encoder = {
     pnm_encode_frame,
     NULL, //encode_end,
     pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_MONOWHITE, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_MONOWHITE, PIX_FMT_NONE},
     .long_name= "PBM (Portable BitMap) image",
 };
 #endif // CONFIG_PBM_ENCODER
@@ -424,7 +424,7 @@ AVCodec pam_encoder = {
     pam_encode_frame,
     NULL, //encode_end,
     pnm_decode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGB32, PIX_FMT_GRAY8, PIX_FMT_MONOWHITE, PIX_FMT_NONE},
     .long_name= "PAM (Portable AnyMap) image",
 };
 #endif // CONFIG_PAM_ENCODER

libavcodec/qtrleenc.c

@@ -322,6 +322,6 @@ AVCodec qtrle_encoder = {
     qtrle_encode_init,
     qtrle_encode_frame,
     qtrle_encode_end,
-    .pix_fmts = (enum PixelFormat[]){PIX_FMT_RGB24, -1},
+    .pix_fmts = (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_NONE},
     .long_name = "QuickTime Animation (RLE) video",
 };

libavcodec/roqvideoenc.c

@@ -1065,6 +1065,6 @@ AVCodec roq_encoder =
     roq_encode_frame,
     roq_encode_end,
     .supported_framerates = (AVRational[]){{30,1}, {0,0}},
-    .pix_fmts = (enum PixelFormat[]){PIX_FMT_YUV444P, -1},
+    .pix_fmts = (enum PixelFormat[]){PIX_FMT_YUV444P, PIX_FMT_NONE},
     .long_name = "Id RoQ video",
 };

libavcodec/sgienc.c

@@ -151,7 +151,7 @@ AVCodec sgi_encoder = {
     encode_init,
     encode_frame,
     NULL,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA, PIX_FMT_PAL8, PIX_FMT_GRAY8, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA, PIX_FMT_PAL8, PIX_FMT_GRAY8, PIX_FMT_NONE},
     .long_name= "SGI image",
 };
 

libavcodec/svq1dec.c

@@ -825,6 +825,6 @@ AVCodec svq1_decoder = {
     svq1_decode_frame,
     CODEC_CAP_DR1,
     .flush= ff_mpeg_flush,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV410P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV410P, PIX_FMT_NONE},
     .long_name= "Sorenson Vector Quantizer 1",
 };

libavcodec/svq1enc.c

@@ -584,6 +584,6 @@ AVCodec svq1_encoder = {
     svq1_encode_init,
     svq1_encode_frame,
     svq1_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV410P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV410P, PIX_FMT_NONE},
     .long_name= "Sorenson Vector Quantizer 1",
 };

libavcodec/targaenc.c

@@ -145,6 +145,6 @@ AVCodec targa_encoder = {
     .priv_data_size = 0,
     .init = targa_encode_init,
     .encode = targa_encode_frame,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB555, PIX_FMT_GRAY8, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_RGB555, PIX_FMT_GRAY8, PIX_FMT_NONE},
     .long_name= "Truevision Targa image",
 };

libavcodec/tiffenc.c

@@ -456,6 +456,6 @@ AVCodec tiff_encoder = {
                               PIX_FMT_YUV420P, PIX_FMT_YUV422P,
                               PIX_FMT_YUV444P, PIX_FMT_YUV410P,
                               PIX_FMT_YUV411P,
-                              -1},
+                              PIX_FMT_NONE},
     .long_name = "TIFF image",
 };

libavcodec/wmv2enc.c

@@ -236,6 +236,6 @@ AVCodec wmv2_encoder = {
     wmv2_encode_init,
     MPV_encode_picture,
     MPV_encode_end,
-    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
+    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
     .long_name= "Windows Media Video 8",
 };

libavcodec/zmbvenc.c

@@ -329,6 +329,6 @@ AVCodec zmbv_encoder = {
     encode_init,
     encode_frame,
     encode_end,
-    .pix_fmts = (enum PixelFormat[]){PIX_FMT_PAL8, -1},
+    .pix_fmts = (enum PixelFormat[]){PIX_FMT_PAL8, PIX_FMT_NONE},
     .long_name = "Zip Motion Blocks Video",
 };

libavdevice/v4l2.c

@@ -223,7 +223,7 @@ static enum PixelFormat fmt_v4l2ff(uint32_t pix_fmt)
         }
     }
 
-    return -1;
+    return PIX_FMT_NONE;
 }
 
 static int mmap_init(AVFormatContext *ctx)