wip
authorJean-Marc Valin <jmvalin@jmvalin.ca>
Fri, 5 May 2017 01:09:22 +0000 (21:09 -0400)
committerJean-Marc Valin <jmvalin@jmvalin.ca>
Fri, 5 May 2017 01:09:22 +0000 (21:09 -0400)
src/ogg_packer.c
src/ogg_packer.h

index eeae5e2..5b7d5fb 100644 (file)
 
 #define MAX_PAGE_SIZE (255*255 + MAX_HEADER_SIZE)
 
+static const oggp_uint32 crc_lookup[256]={
+  0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9,
+  0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005,
+  0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61,
+  0x350c9b64,0x31cd86d3,0x3c8ea00a,0x384fbdbd,
+  0x4c11db70,0x48d0c6c7,0x4593e01e,0x4152fda9,
+  0x5f15adac,0x5bd4b01b,0x569796c2,0x52568b75,
+  0x6a1936c8,0x6ed82b7f,0x639b0da6,0x675a1011,
+  0x791d4014,0x7ddc5da3,0x709f7b7a,0x745e66cd,
+  0x9823b6e0,0x9ce2ab57,0x91a18d8e,0x95609039,
+  0x8b27c03c,0x8fe6dd8b,0x82a5fb52,0x8664e6e5,
+  0xbe2b5b58,0xbaea46ef,0xb7a96036,0xb3687d81,
+  0xad2f2d84,0xa9ee3033,0xa4ad16ea,0xa06c0b5d,
+  0xd4326d90,0xd0f37027,0xddb056fe,0xd9714b49,
+  0xc7361b4c,0xc3f706fb,0xceb42022,0xca753d95,
+  0xf23a8028,0xf6fb9d9f,0xfbb8bb46,0xff79a6f1,
+  0xe13ef6f4,0xe5ffeb43,0xe8bccd9a,0xec7dd02d,
+  0x34867077,0x30476dc0,0x3d044b19,0x39c556ae,
+  0x278206ab,0x23431b1c,0x2e003dc5,0x2ac12072,
+  0x128e9dcf,0x164f8078,0x1b0ca6a1,0x1fcdbb16,
+  0x018aeb13,0x054bf6a4,0x0808d07d,0x0cc9cdca,
+  0x7897ab07,0x7c56b6b0,0x71159069,0x75d48dde,
+  0x6b93dddb,0x6f52c06c,0x6211e6b5,0x66d0fb02,
+  0x5e9f46bf,0x5a5e5b08,0x571d7dd1,0x53dc6066,
+  0x4d9b3063,0x495a2dd4,0x44190b0d,0x40d816ba,
+  0xaca5c697,0xa864db20,0xa527fdf9,0xa1e6e04e,
+  0xbfa1b04b,0xbb60adfc,0xb6238b25,0xb2e29692,
+  0x8aad2b2f,0x8e6c3698,0x832f1041,0x87ee0df6,
+  0x99a95df3,0x9d684044,0x902b669d,0x94ea7b2a,
+  0xe0b41de7,0xe4750050,0xe9362689,0xedf73b3e,
+  0xf3b06b3b,0xf771768c,0xfa325055,0xfef34de2,
+  0xc6bcf05f,0xc27dede8,0xcf3ecb31,0xcbffd686,
+  0xd5b88683,0xd1799b34,0xdc3abded,0xd8fba05a,
+  0x690ce0ee,0x6dcdfd59,0x608edb80,0x644fc637,
+  0x7a089632,0x7ec98b85,0x738aad5c,0x774bb0eb,
+  0x4f040d56,0x4bc510e1,0x46863638,0x42472b8f,
+  0x5c007b8a,0x58c1663d,0x558240e4,0x51435d53,
+  0x251d3b9e,0x21dc2629,0x2c9f00f0,0x285e1d47,
+  0x36194d42,0x32d850f5,0x3f9b762c,0x3b5a6b9b,
+  0x0315d626,0x07d4cb91,0x0a97ed48,0x0e56f0ff,
+  0x1011a0fa,0x14d0bd4d,0x19939b94,0x1d528623,
+  0xf12f560e,0xf5ee4bb9,0xf8ad6d60,0xfc6c70d7,
+  0xe22b20d2,0xe6ea3d65,0xeba91bbc,0xef68060b,
+  0xd727bbb6,0xd3e6a601,0xdea580d8,0xda649d6f,
+  0xc423cd6a,0xc0e2d0dd,0xcda1f604,0xc960ebb3,
+  0xbd3e8d7e,0xb9ff90c9,0xb4bcb610,0xb07daba7,
+  0xae3afba2,0xaafbe615,0xa7b8c0cc,0xa379dd7b,
+  0x9b3660c6,0x9ff77d71,0x92b45ba8,0x9675461f,
+  0x8832161a,0x8cf30bad,0x81b02d74,0x857130c3,
+  0x5d8a9099,0x594b8d2e,0x5408abf7,0x50c9b640,
+  0x4e8ee645,0x4a4ffbf2,0x470cdd2b,0x43cdc09c,
+  0x7b827d21,0x7f436096,0x7200464f,0x76c15bf8,
+  0x68860bfd,0x6c47164a,0x61043093,0x65c52d24,
+  0x119b4be9,0x155a565e,0x18197087,0x1cd86d30,
+  0x029f3d35,0x065e2082,0x0b1d065b,0x0fdc1bec,
+  0x3793a651,0x3352bbe6,0x3e119d3f,0x3ad08088,
+  0x2497d08d,0x2056cd3a,0x2d15ebe3,0x29d4f654,
+  0xc5a92679,0xc1683bce,0xcc2b1d17,0xc8ea00a0,
+  0xd6ad50a5,0xd26c4d12,0xdf2f6bcb,0xdbee767c,
+  0xe3a1cbc1,0xe760d676,0xea23f0af,0xeee2ed18,
+  0xf0a5bd1d,0xf464a0aa,0xf9278673,0xfde69bc4,
+  0x89b8fd09,0x8d79e0be,0x803ac667,0x84fbdbd0,
+  0x9abc8bd5,0x9e7d9662,0x933eb0bb,0x97ffad0c,
+  0xafb010b1,0xab710d06,0xa6322bdf,0xa2f33668,
+  0xbcb4666d,0xb8757bda,0xb5365d03,0xb1f740b4};
+
+static void ogg_page_checksum_set(unsigned char *page, int len){
+  oggp_uint32 crc_reg=0;
+  int i;
+
+  /* safety; needed for API behavior, but not framing code */
+  page[22]=0;
+  page[23]=0;
+  page[24]=0;
+  page[25]=0;
+
+  for(i=0;i<len;i++) crc_reg=(crc_reg<<8)^crc_lookup[((crc_reg >> 24)&0xff)^page[i]];
+
+  page[22]=(unsigned char)(crc_reg&0xff);
+  page[23]=(unsigned char)((crc_reg>>8)&0xff);
+  page[24]=(unsigned char)((crc_reg>>16)&0xff);
+  page[25]=(unsigned char)((crc_reg>>24)&0xff);
+}
+
 typedef struct {
   oggp_uint64 granulepos;
   int buf_pos;
@@ -39,6 +123,7 @@ typedef struct {
   int lacing_pos;
   int lacing_size;
   int flags;
+  int pageno;
 } oggp_page;
 
 struct oggpacker {
@@ -55,9 +140,11 @@ struct oggpacker {
   oggp_page *pages;
   int pages_size;
   int pages_fill;
-  int muxing_delay;
+  oggp_uint64 muxing_delay;
   int is_eos;
   oggp_uint64 curr_granule;
+  oggp_uint64 last_granule;
+  int pageno;
 };
 
 /** Allocates an oggpacker object */
@@ -88,6 +175,10 @@ oggpacker *oggp_create(int serialno) {
 
   oggp->is_eos = 0;
   oggp->curr_granule = 0;
+  oggp->last_granule = 0;
+  oggp->pageno = 0;
+  oggp->muxing_delay = 0;
+  return oggp;
 fail:
   if (oggp) {
     if (oggp->lacing) free(oggp->lacing);
@@ -131,15 +222,19 @@ int oggp_commit_packet(oggpacker *oggp, int bytes, oggp_uint64 granulepos, int e
   int nb_255s;
   oggp->buf_fill += bytes;
   nb_255s = bytes/255;
-  /* FIXME: Check if we should flush before the packet. */
-  /* FIXME: Check lacing size */
+  if (oggp->lacing_fill-oggp->lacing_begin+nb_255s+1 > 255 ||
+      (oggp->muxing_delay && granulepos - oggp->last_granule > oggp->muxing_delay)) {
+    oggp_flush_page(oggp, 1);
+  }
   for (i=0;i<nb_255s;i++) {
     oggp->lacing[oggp->lacing_fill+i] = 255;
   }
   oggp->lacing[oggp->lacing_fill+nb_255s] = bytes - 255*nb_255s;
   oggp->curr_granule = granulepos;
   oggp->is_eos = eos;
-  /* FIXME: Check if we should flush after the packet. */
+  if (oggp->muxing_delay && granulepos - oggp->last_granule >= oggp->muxing_delay) {
+    oggp_flush_page(oggp, 1);
+  }
   return 0;
 }
 
@@ -158,8 +253,11 @@ int oggp_flush_page(oggpacker *oggp, int close_cont) {
   p->buf_size = oggp->buf_fill - oggp->buf_begin;
   p->lacing_pos = oggp->lacing_begin;
   p->lacing_size = oggp->lacing_fill - oggp->lacing_begin;
+  p->pageno = oggp->pageno;
   /* FIXME: Handle bos/eos and continued pages. */
   p->flags = 0;
+  oggp->pageno++;
+  oggp->last_granule = oggp->curr_granule;
   (void)close_cont;
   return 0;
 }
@@ -168,17 +266,56 @@ int oggp_flush_page(oggpacker *oggp, int close_cont) {
     invalidated on the next call to oggp_get_next_page(). */
 int oggp_get_next_page(oggpacker *oggp, unsigned char **page, int *bytes) {
   oggp_page *p;
+  int i;
   unsigned char *ptr;
+  int len;
   int header_size;
+  oggp_uint64 granule_pos;
   p = &oggp->pages[0];
   header_size = 27 + p->lacing_size;
   ptr = &oggp->buf[p->buf_pos - header_size];
+  len = p->buf_size + header_size;
   memcpy(&ptr[27], &oggp->lacing[p->lacing_pos], p->lacing_size);
   memcpy(ptr, "OggS", 4);
-  /* FIXME: Write the other fields. */
+
+  /* stream structure version */
+  ptr[4]=0x00;
+
+  /* FIXME: handle eos/continuation */
+  ptr[5]=0x00;
+  if (p->pageno == 0) ptr[5] |= 0x02;
+
+  granule_pos = p->granulepos;
+  /* 64 bits of PCM position */
+  for(i=6;i<14;i++){
+    ptr[i]=(unsigned char)(granule_pos&0xff);
+    granule_pos>>=8;
+  }
+
+  /* 32 bits of stream serial number */
+  {
+    long serialno=oggp->serialno;
+    for(i=14;i<18;i++){
+      ptr[i]=(unsigned char)(serialno&0xff);
+      serialno>>=8;
+    }
+  }
+
+  {
+    long pageno=p->pageno;
+    for(i=18;i<22;i++){
+      ptr[i]=(unsigned char)(pageno&0xff);
+      pageno>>=8;
+    }
+  }
+
+  ptr[26] = p->lacing_size;
+
+  /* CRC is always last. */
+  ogg_page_checksum_set(ptr, len);
 
   *page = ptr;
-  *bytes = p->buf_size + header_size;
+  *bytes = len;
   oggp->pages_fill--;
   memmove(&oggp->pages[0], &oggp->pages[1], oggp->pages_fill);
   return 0;
@@ -190,6 +327,8 @@ int oggp_chain(oggpacker *oggp, int serialno) {
   oggp_flush_page(oggp, 1);
   oggp->serialno = serialno;
   oggp->curr_granule = 0;
+  oggp->last_granule = 0;
   oggp->is_eos = 0;
+  oggp->pageno = 0;
   return 0;
 }
index 990af21..d2db7b5 100644 (file)
@@ -33,6 +33,9 @@ extern "C" {
 # endif
 
 typedef unsigned long long oggp_uint64;
+typedef unsigned oggp_uint32;
+typedef int oggp_int32;
+
 typedef struct oggpacker oggpacker;
 
 /** Allocates an oggpacker object */