lavf: Add pcx auto-detection.

libavformat/Makefile

@@ -218,6 +218,7 @@ OBJS-$(CONFIG_IMAGE_EXR_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_J2K_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_JPEG_PIPE_DEMUXER)    += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_JPEGLS_PIPE_DEMUXER)  += img2dec.o img2.o
+OBJS-$(CONFIG_IMAGE_PCX_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_PICTOR_PIPE_DEMUXER)  += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_PNG_PIPE_DEMUXER)     += img2dec.o img2.o
 OBJS-$(CONFIG_IMAGE_QDRAW_PIPE_DEMUXER)   += img2dec.o img2.o

libavformat/allformats.c

@@ -358,6 +358,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (IMAGE_J2K_PIPE,        image_j2k_pipe);
     REGISTER_DEMUXER (IMAGE_JPEG_PIPE,       image_jpeg_pipe);
     REGISTER_DEMUXER (IMAGE_JPEGLS_PIPE,     image_jpegls_pipe);
+    REGISTER_DEMUXER (IMAGE_PCX_PIPE,        image_pcx_pipe);
     REGISTER_DEMUXER (IMAGE_PICTOR_PIPE,     image_pictor_pipe);
     REGISTER_DEMUXER (IMAGE_PNG_PIPE,        image_png_pipe);
     REGISTER_DEMUXER (IMAGE_QDRAW_PIPE,      image_qdraw_pipe);

libavformat/img2dec.c

@@ -764,6 +764,27 @@ static int jpegls_probe(AVProbeData *p)
     return 0;
 }
 
+static int pcx_probe(AVProbeData *p)
+{
+    const uint8_t *b = p->buf;
+
+    if (   p->buf_size < 128
+        || b[0] != 10
+        || b[1] > 5
+        || b[2] != 1
+        || av_popcount(b[3]) != 1 || b[3] > 8
+        || AV_RL16(&b[4]) > AV_RL16(&b[8])
+        || AV_RL16(&b[6]) > AV_RL16(&b[10])
+        || b[64])
+        return 0;
+    b += 73;
+    while (++b < p->buf + 128)
+        if (*b)
+            return AVPROBE_SCORE_EXTENSION / 4;
+
+    return AVPROBE_SCORE_EXTENSION + 1;
+}
+
 static int qdraw_probe(AVProbeData *p)
 {
     const uint8_t *b = p->buf;
@@ -865,6 +886,7 @@ IMAGEAUTO_DEMUXER(exr,     AV_CODEC_ID_EXR)
 IMAGEAUTO_DEMUXER(j2k,     AV_CODEC_ID_JPEG2000)
 IMAGEAUTO_DEMUXER(jpeg,    AV_CODEC_ID_MJPEG)
 IMAGEAUTO_DEMUXER(jpegls,  AV_CODEC_ID_JPEGLS)
+IMAGEAUTO_DEMUXER(pcx,     AV_CODEC_ID_PCX)
 IMAGEAUTO_DEMUXER(pictor,  AV_CODEC_ID_PICTOR)
 IMAGEAUTO_DEMUXER(png,     AV_CODEC_ID_PNG)
 IMAGEAUTO_DEMUXER(qdraw,   AV_CODEC_ID_QDRAW)

libavformat/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFORMAT_VERSION_MAJOR  57
-#define LIBAVFORMAT_VERSION_MINOR  26
+#define LIBAVFORMAT_VERSION_MINOR  27
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \