avformat/m4vdec: Use the same constant names as libavcodec
[ffmpeg.git] / libavformat / m4vdec.c
index 4b0154e..220daeb 100644 (file)
 #include "avformat.h"
 #include "rawdec.h"
 
-#define VISUAL_OBJECT_START_CODE       0x000001b5
-#define VOP_START_CODE                 0x000001b6
+#define VOS_STARTCODE        0x1B0
+#define USER_DATA_STARTCODE  0x1B2
+#define GOP_STARTCODE        0x1B3
+#define VISUAL_OBJ_STARTCODE 0x1B5
+#define VOP_STARTCODE        0x1B6
+#define SLICE_STARTCODE      0x1B7
+#define EXT_STARTCODE        0x1B8
 
 static int mpeg4video_probe(AVProbeData *probe_packet)
 {
-    uint32_t temp_buffer= -1;
-    int VO=0, VOL=0, VOP = 0, VISO = 0, res=0;
+    uint32_t temp_buffer = -1;
+    int VO = 0, VOL = 0, VOP = 0, VISO = 0, res = 0;
+    int res_main = 0;
     int i;
 
-    for(i=0; i<probe_packet->buf_size; i++){
-        temp_buffer = (temp_buffer<<8) + probe_packet->buf[i];
-        if ((temp_buffer & 0xffffff00) != 0x100)
+    for (i = 0; i < probe_packet->buf_size; i++) {
+        temp_buffer = (temp_buffer << 8) + probe_packet->buf[i];
+        if (temp_buffer & 0xfffffe00)
+            continue;
+        if (temp_buffer < 2)
             continue;
 
-        if (temp_buffer == VOP_START_CODE)                         VOP++;
-        else if (temp_buffer == VISUAL_OBJECT_START_CODE)          VISO++;
-        else if (temp_buffer < 0x120)                              VO++;
-        else if (temp_buffer < 0x130)                              VOL++;
-        else if (   !(0x1AF < temp_buffer && temp_buffer < 0x1B7)
-                 && !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) res++;
+        if (temp_buffer == VOP_STARTCODE)
+            VOP++;
+        else if (temp_buffer == VISUAL_OBJ_STARTCODE)
+            VISO++;
+        else if (temp_buffer >= 0x100 && temp_buffer < 0x120)
+            VO++;
+        else if (temp_buffer >= 0x120 && temp_buffer < 0x130)
+            VOL++;
+        else if (temp_buffer == SLICE_STARTCODE || temp_buffer == EXT_STARTCODE)
+            res_main++;
+        else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) &&
+                 !(0x1B9 < temp_buffer && temp_buffer < 0x1C4))
+            res++;
     }
 
-    if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res==0)
-        return AVPROBE_SCORE_MAX/2;
+    // res_main repesents the reserved codes within the "main" profile, they are
+    // added to the reserved ones if it appears that this is a "main" profile
+    // stream
+    if (res_main && 2*res_main < VOP)
+        res += res_main;
+
+    if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res == 0)
+        return VOP+VO > 4 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2;
+
+    if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && VOP+VO > 4)
+        return AVPROBE_SCORE_EXTENSION/10;
     return 0;
 }
 
-AVInputFormat ff_m4v_demuxer = {
-    "m4v",
-    NULL_IF_CONFIG_SMALL("raw MPEG-4 video format"),
-    0,
-    mpeg4video_probe, /** probing for MPEG-4 data */
-    ff_raw_video_read_header,
-    ff_raw_read_partial_packet,
-    .flags= AVFMT_GENERIC_INDEX,
-    .extensions = "m4v",
-    .value = CODEC_ID_MPEG4,
-};
+FF_DEF_RAWVIDEO_DEMUXER2(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v",
+                         AV_CODEC_ID_MPEG4, AVFMT_GENERIC_INDEX | AVFMT_TS_DISCONT)