[FFmpeg-devel] [PATCH]lavf: Add pcx auto-detection

[Carl Eugen Hoyos]

Hi!

Attached patch adds auto-detection for pcx images.

Please comment, Carl Eugen
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diff --git a/libavformat/Makefile b/libavformat/Makefile
index 782908e..edfa695 100644
--- a/libavformat/Makefile
+++ b/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
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 9662941..fc87900 100644
--- a/libavformat/allformats.c
+++ b/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);
diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index 94cce93..b2a0ee5 100644
--- a/libavformat/img2dec.c
+++ b/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] > 6
+        || 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)