Changeset 2489 for pjproject/branches/projects/aps-direct/pjmedia/include/pjmedia/types.h

Timestamp:

Mar 5, 2009 6:02:28 PM (15 years ago)

Author:

bennylp

Message:

Ticket #736 (aps-direct branch): implemented the compatibility layer for the old sound API

File:

• pjproject/branches/projects/aps-direct/pjmedia/include/pjmedia/types.h (modified) (1 diff)

pjproject/branches/projects/aps-direct/pjmedia/include/pjmedia/types.h

@@ -325 +325 @@
 }
 
+/** 
+ * Types of media frame. 
+ */
+typedef enum pjmedia_frame_type
+{
+    PJMEDIA_FRAME_TYPE_NONE,        /**< No frame.              */
+    PJMEDIA_FRAME_TYPE_AUDIO,       /**< Normal audio frame.    */
+    PJMEDIA_FRAME_TYPE_EXTENDED     /**< Extended audio frame.  */
+
+} pjmedia_frame_type;
+
+
+/** 
+ * This structure describes a media frame. 
+ */
+typedef struct pjmedia_frame
+{
+    pjmedia_frame_type   type;      /**< Frame type.                        */
+    void                *buf;       /**< Pointer to buffer.                 */
+    pj_size_t            size;      /**< Frame size in bytes.               */
+    pj_timestamp         timestamp; /**< Frame timestamp.                   */
+    pj_uint32_t          bit_info;  /**< Bit info of the frame, sample case:
+                                         a frame may not exactly start and end
+                                         at the octet boundary, so this field 
+                                         may be used for specifying start & 
+                                         end bit offset.                    */
+} pjmedia_frame;
+
+
+/**
+ * The pjmedia_frame_ext is used to carry a more complex audio frames than
+ * the typical PCM audio frames, and it is signaled by setting the "type"
+ * field of a pjmedia_frame to PJMEDIA_FRAME_TYPE_EXTENDED. With this set,
+ * application may typecast pjmedia_frame to pjmedia_frame_ext.
+ *
+ * This structure may contain more than one audio frames, which subsequently
+ * will be called subframes in this structure. The subframes section
+ * immediately follows the end of this structure, and each subframe is
+ * represented by pjmedia_frame_ext_subframe structure. Every next
+ * subframe immediately follows the previous subframe, and all subframes
+ * are byte-aligned although its payload may not be byte-aligned.
+ */
+
+#pragma pack(1)
+typedef struct pjmedia_frame_ext {
+    pjmedia_frame   base;           /**< Base frame info */
+    pj_uint16_t     samples_cnt;    /**< Number of samples in this frame */
+    pj_uint16_t     subframe_cnt;   /**< Number of (sub)frames in this frame */
+
+    /* Zero or more (sub)frames follows immediately after this,
+     * each will be represented by pjmedia_frame_ext_subframe
+     */
+} pjmedia_frame_ext;
+#pragma pack()
+
+/**
+ * This structure represents the individual subframes in the
+ * pjmedia_frame_ext structure.
+ */
+#pragma pack(1)
+typedef struct pjmedia_frame_ext_subframe {
+    pj_uint16_t     bitlen;         /**< Number of bits in the data */
+    pj_uint8_t      data[1];        /**< Start of encoded data */
+} pjmedia_frame_ext_subframe;
+
+#pragma pack()
+
+
+/**
+ * Append one subframe to #pjmedia_frame_ext.
+ *
+ * @param frm               The #pjmedia_frame_ext.
+ * @param src               Subframe data.
+ * @param bitlen            Lenght of subframe, in bits.
+ * @param samples_cnt       Number of audio samples in subframe.
+ */
+PJ_INLINE(void) pjmedia_frame_ext_append_subframe(pjmedia_frame_ext *frm,
+                                                  const void *src,
+                                                  unsigned bitlen,
+                                                  unsigned samples_cnt)
+{
+    pjmedia_frame_ext_subframe *fsub;
+    pj_uint8_t *p;
+    unsigned i;
+
+    p = (pj_uint8_t*)frm + sizeof(pjmedia_frame_ext);
+    for (i = 0; i < frm->subframe_cnt; ++i) {
+        fsub = (pjmedia_frame_ext_subframe*) p;
+        p += sizeof(fsub->bitlen) + ((fsub->bitlen+7) >> 3);
+    }
+
+    fsub = (pjmedia_frame_ext_subframe*) p;
+    fsub->bitlen = (pj_uint16_t)bitlen;
+    if (bitlen)
+        pj_memcpy(fsub->data, src, (bitlen+7) >> 3);
+
+    frm->subframe_cnt++;
+    frm->samples_cnt = (pj_uint16_t)(frm->samples_cnt + samples_cnt);
+}
+
+/**
+ * Get a subframe from #pjmedia_frame_ext.
+ *
+ * @param frm               The #pjmedia_frame_ext.
+ * @param n                 Subframe index, zero based.
+ *
+ * @return                  The n-th subframe, or NULL if n is out-of-range.
+ */
+PJ_INLINE(pjmedia_frame_ext_subframe*) 
+pjmedia_frame_ext_get_subframe(const pjmedia_frame_ext *frm, unsigned n)
+{
+    pjmedia_frame_ext_subframe *sf = NULL;
+
+    if (n < frm->subframe_cnt) {
+        pj_uint8_t *p;
+        unsigned i;
+
+        p = (pj_uint8_t*)frm + sizeof(pjmedia_frame_ext);
+        for (i = 0; i < n; ++i) {       
+            sf = (pjmedia_frame_ext_subframe*) p;
+            p += sizeof(sf->bitlen) + ((sf->bitlen+7) >> 3);
+        }
+        
+        sf = (pjmedia_frame_ext_subframe*) p;
+    }
+
+    return sf;
+}
+        
+/**
+ * Extract all frame payload to the specified buffer. 
+ *
+ * @param frm               The frame.
+ * @param dst               Destination buffer.
+ * @param maxsize           Maximum size to copy (i.e. the size of the
+ *                          destination buffer).
+ *
+ * @return                  Total size of payload copied.
+ */
+PJ_INLINE(unsigned) 
+pjmedia_frame_ext_copy_payload(const pjmedia_frame_ext *frm,
+                               void *dst, 
+                               unsigned maxlen)
+{
+    unsigned i, copied=0;
+    for (i=0; i<frm->subframe_cnt; ++i) {
+        pjmedia_frame_ext_subframe *sf;
+        unsigned sz;
+
+        sf = pjmedia_frame_ext_get_subframe(frm, i);
+        if (!sf)
+            continue;
+
+        sz = ((sf->bitlen + 7) >> 3);
+        if (sz + copied > maxlen)
+            break;
+
+        pj_memcpy(((pj_uint8_t*)dst) + copied, sf->data, sz);
+        copied += sz;
+    }
+    return copied;
+}
+
+
+/**
+ * Pop out first n subframes from #pjmedia_frame_ext.
+ *
+ * @param frm               The #pjmedia_frame_ext.
+ * @param n                 Number of first subframes to be popped out.
+ *
+ * @return                  PJ_SUCCESS when successful.
+ */
+PJ_INLINE(pj_status_t) 
+pjmedia_frame_ext_pop_subframes(pjmedia_frame_ext *frm, unsigned n)
+{
+    pjmedia_frame_ext_subframe *sf;
+    pj_uint8_t *move_src;
+    unsigned move_len;
+
+    if (frm->subframe_cnt <= n) {
+        frm->subframe_cnt = 0;
+        frm->samples_cnt = 0;
+        return PJ_SUCCESS;
+    }
+
+    move_src = (pj_uint8_t*)pjmedia_frame_ext_get_subframe(frm, n);
+    sf = pjmedia_frame_ext_get_subframe(frm, frm->subframe_cnt-1);
+    move_len = (pj_uint8_t*)sf - move_src + sizeof(sf->bitlen) + 
+               ((sf->bitlen+7) >> 3);
+    pj_memmove((pj_uint8_t*)frm+sizeof(pjmedia_frame_ext), 
+               move_src, move_len);
+            
+    frm->samples_cnt = (pj_uint16_t)
+                   (frm->samples_cnt - n*frm->samples_cnt/frm->subframe_cnt);
+    frm->subframe_cnt = (pj_uint16_t) (frm->subframe_cnt - n);
+
+    return PJ_SUCCESS;
+}
+
+
 /**
  * @}