Changeset 389 for libmpc/trunk/libmpcdec/mpc_demux.c

Timestamp:

04/02/08 17:22:31 (17 years ago)

Author:

r2d

Message:

• libmpcdec can now find chapters in files without seek table

File:

• libmpc/trunk/libmpcdec/mpc_demux.c (modified) (3 diffs)

libmpc/trunk/libmpcdec/mpc_demux.c

@@ -275 +275 @@
 static void mpc_demux_chap_find(mpc_demux * d)
 {
-        if (d->chap_pos == 0) {
-                // FIXME : find chapters from end of file
-        }
         mpc_block b;
         int tag_size = 0, chap_size = 0, size, i = 0;
+
+        if (d->si.stream_version < 8)
+                return;
+
+        if (d->chap_pos == 0) {
+                mpc_uint64_t cur_pos = (d->si.header_position + 4) * 8;
+                mpc_demux_seek(d, cur_pos, 11); // seek to the beginning of the stream
+                size = mpc_bits_get_block(&d->bits_reader, &b);
+                while (memcmp(b.key, "SE", 2) != 0) {
+                        if (memcmp(b.key, "CT", 2) == 0) {
+                                if (d->chap_pos == 0) d->chap_pos = cur_pos;
+                        } else
+                                d->chap_pos = 0;
+                        cur_pos += (size + b.size) * 8;
+                        mpc_demux_seek(d, cur_pos, 11);
+                        size = mpc_bits_get_block(&d->bits_reader, &b);
+                }
+                if (d->chap_pos == 0)
+                        d->chap_pos = cur_pos;
+        }
+
         d->chap_nb = 0;
         mpc_demux_seek(d, d->chap_pos, 20);
@@ -294 +312 @@
         }
 
-        d->chap = malloc(sizeof(mpc_chap_t) * d->chap_nb + tag_size);
-        char * ptag = (char*)(d->chap + d->chap_nb);
-
-        mpc_demux_seek(d, d->chap_pos, 11);
-        size = mpc_bits_get_block(&d->bits_reader, &b);
-        while (memcmp(b.key, "CT", 2) == 0) {
-                mpc_demux_fill(d, 11 + (mpc_uint32_t) b.size, 0);
-                size = mpc_bits_get_size(&d->bits_reader, &d->chap[i].sample);
-                memcpy(ptag, d->bits_reader.buff + ((8 - d->bits_reader.count) >> 3), b.size - size);
-                d->bits_reader.buff += b.size - size;
-                d->chap[i].tag_size = b.size - size;
-                d->chap[i].tag = ptag;
-                ptag += b.size - size;
-                i++;
+        if (d->chap_nb > 0) {
+                d->chap = malloc(sizeof(mpc_chap_t) * d->chap_nb + tag_size);
+                char * ptag = (char*)(d->chap + d->chap_nb);
+
+                mpc_demux_seek(d, d->chap_pos, 11);
                 size = mpc_bits_get_block(&d->bits_reader, &b);
+                while (memcmp(b.key, "CT", 2) == 0) {
+                        mpc_demux_fill(d, 11 + (mpc_uint32_t) b.size, 0);
+                        size = mpc_bits_get_size(&d->bits_reader, &d->chap[i].sample);
+                        memcpy(ptag, d->bits_reader.buff + ((8 - d->bits_reader.count) >> 3), b.size - size);
+                        d->bits_reader.buff += b.size - size;
+                        d->chap[i].tag_size = b.size - size;
+                        d->chap[i].tag = ptag;
+                        ptag += b.size - size;
+                        i++;
+                        size = mpc_bits_get_block(&d->bits_reader, &b);
+                }
         }
         
@@ -325 +345 @@
         if (d->chap_nb == -1)
                 mpc_demux_chap_find(d);
-        if (chap_nb >= d->chap_nb)
+        if (chap_nb >= d->chap_nb || chap_nb < 0)
                 return 0;
         if (tag != 0 && tag_size != 0) {