lavc/libkvazaar: fix incompatible pointer type.
[ffmpeg.git] / libavformat / dtsdec.c
index c132c08..a3e52cd 100644 (file)
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/crc.h"
+
 #include "libavcodec/bytestream.h"
+#include "libavcodec/dca.h"
+#include "libavcodec/dca_syncwords.h"
+#include "libavcodec/get_bits.h"
+
 #include "avformat.h"
 #include "rawdec.h"
 
-#define DCA_MARKER_14B_BE 0x1FFFE800
-#define DCA_MARKER_14B_LE 0xFF1F00E8
-#define DCA_MARKER_RAW_BE 0x7FFE8001
-#define DCA_MARKER_RAW_LE 0xFE7F0180
-
 static int dts_probe(AVProbeData *p)
 {
     const uint8_t *buf, *bufp;
     uint32_t state = -1;
-    int markers[3] = {0};
-    int sum, max;
+    int markers[4*16] = {0};
+    int exss_markers = 0, exss_nextpos = 0;
+    int sum, max, pos, ret, i;
+    int64_t diff = 0;
+    uint8_t hdr[DCA_CORE_FRAME_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE] = { 0 };
 
-    buf = p->buf;
+    for (pos = FFMIN(4096, p->buf_size); pos < p->buf_size - 2; pos += 2) {
+        int marker, wide_hdr, hdr_size, framesize;
+        DCACoreFrameHeader h;
+        GetBitContext gb;
 
-    for(; buf < (p->buf+p->buf_size)-2; buf+=2) {
-        bufp = buf;
+        bufp = buf = p->buf + pos;
         state = (state << 16) | bytestream_get_be16(&bufp);
 
+        if (pos >= 4)
+            diff += FFABS(((int16_t)AV_RL16(buf)) - (int16_t)AV_RL16(buf-4));
+
+        /* extension substream (EXSS) */
+        if (state == DCA_SYNCWORD_SUBSTREAM) {
+            if (pos < exss_nextpos)
+                continue;
+
+            init_get_bits(&gb, buf - 2, 96);
+            skip_bits_long(&gb, 42);
+
+            wide_hdr  = get_bits1(&gb);
+            hdr_size  = get_bits(&gb,  8 + 4 * wide_hdr) + 1;
+            framesize = get_bits(&gb, 16 + 4 * wide_hdr) + 1;
+            if (hdr_size & 3 || framesize & 3)
+                continue;
+            if (hdr_size < 16 || framesize < hdr_size)
+                continue;
+            if (pos - 2 + hdr_size > p->buf_size)
+                continue;
+            if (av_crc(av_crc_get_table(AV_CRC_16_CCITT), 0xffff, buf + 3, hdr_size - 5))
+                continue;
+
+            if (pos == exss_nextpos)
+                exss_markers++;
+            else
+                exss_markers = FFMAX(1, exss_markers - 1);
+            exss_nextpos = pos + framesize;
+            continue;
+        }
+
         /* regular bitstream */
-        if (state == DCA_MARKER_RAW_BE || state == DCA_MARKER_RAW_LE)
-            markers[0]++;
+        if (state == DCA_SYNCWORD_CORE_BE &&
+            (bytestream_get_be16(&bufp) & 0xFC00) == 0xFC00)
+            marker = 0;
+        else if (state == DCA_SYNCWORD_CORE_LE &&
+                 (bytestream_get_be16(&bufp) & 0x00FC) == 0x00FC)
+            marker = 1;
 
         /* 14 bits big-endian bitstream */
-        if (state == DCA_MARKER_14B_BE)
-            if ((bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0)
-                markers[1]++;
+        else if (state == DCA_SYNCWORD_CORE_14B_BE &&
+                 (bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0)
+            marker = 2;
 
         /* 14 bits little-endian bitstream */
-        if (state == DCA_MARKER_14B_LE)
-            if ((bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
-                markers[2]++;
+        else if (state == DCA_SYNCWORD_CORE_14B_LE &&
+                 (bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
+            marker = 3;
+        else
+            continue;
+
+        if ((ret = avpriv_dca_convert_bitstream(buf - 2, DCA_CORE_FRAME_HEADER_SIZE,
+                                                hdr,     DCA_CORE_FRAME_HEADER_SIZE)) < 0)
+            continue;
+        if (avpriv_dca_parse_core_frame_header(&h, hdr, ret) < 0)
+            continue;
+
+        marker += 4 * h.sr_code;
+
+        markers[marker] ++;
     }
-    sum = markers[0] + markers[1] + markers[2];
-    max = markers[1] > markers[0];
-    max = markers[2] > markers[max] ? 2 : max;
+
+    if (exss_markers > 3)
+        return AVPROBE_SCORE_EXTENSION + 1;
+
+    sum = max = 0;
+    for (i=0; i<FF_ARRAY_ELEMS(markers); i++) {
+        sum += markers[i];
+        if (markers[max] < markers[i])
+            max = i;
+    }
+
     if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 &&
-        markers[max] * 4 > sum * 3)
-        return AVPROBE_SCORE_MAX/2+1;
+        markers[max] * 4 > sum * 3 &&
+        diff / p->buf_size > 200)
+        return AVPROBE_SCORE_EXTENSION + 1;
 
     return 0;
 }
 
-AVInputFormat dts_demuxer = {
-    "dts",
-    NULL_IF_CONFIG_SMALL("raw DTS"),
-    0,
-    dts_probe,
-    ff_raw_audio_read_header,
-    ff_raw_read_partial_packet,
-    .flags= AVFMT_GENERIC_INDEX,
-    .extensions = "dts",
-    .value = CODEC_ID_DTS,
+AVInputFormat ff_dts_demuxer = {
+    .name           = "dts",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw DTS"),
+    .read_probe     = dts_probe,
+    .read_header    = ff_raw_audio_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .flags          = AVFMT_GENERIC_INDEX,
+    .extensions     = "dts",
+    .raw_codec_id   = AV_CODEC_ID_DTS,
 };