Changeset 805a9ad61bb628aee2ca936d048a86f16503bc56

Timestamp:

03/14/08 10:10:03 (6 months ago)

Author:

Rafaël Carré <funman@videolan.org>

git-committer:

Rafaël Carré <funman@videolan.org> 1205485803 +0100

git-parent:

[62d91d413bc4a7c52a8b598680db14a19e523291]

git-author:

Rafaël Carré <funman@videolan.org> 1205485660 +0100

Message:

Fix AAC muxing into TS

Add ADTS headers on top of the raw AAC frames
Use the ADTS stream type (0x0f) since LOAS isn't implemented

This was wrong since we were streaming raw, not LOAS/LATM

Files:

• modules/mux/mpeg/ts.c (modified) (5 diffs)

modules/mux/mpeg/ts.c

@@ -460 +460 @@
-
-static block_t *FixPES( sout_mux_t *p_mux, block_fifo_t *p_fifo );
+static block_t *Add_ADTS( block_t *, es_format_t * );
-static void TSSchedule  ( sout_mux_t *p_mux, sout_buffer_chain_t *p_chain_ts,
-                          mtime_t i_pcr_length, mtime_t i_pcr_dts );
@@ -973 +974 @@
-                    break;
-                case VLC_FOURCC( 'm', 'p','4', 'a' ):
-
+
+
+
+
-                    p_stream->i_stream_id = 0xfa;
-                    p_sys->i_mpeg4_streams++;
@@ -1396 +1400 @@
-                         || p_input->p_fmt->i_codec !=
-                             VLC_FOURCC('m', 'p', 'g', 'a') )
+                    {
-                        p_data = block_FifoGet( p_input->p_fifo );
+
+                        if( p_input->p_fmt->i_codec ==
+                                VLC_FOURCC('m', 'p', '4', 'a' ) )
+                            p_data = Add_ADTS( p_data, p_input->p_fmt );
+                    }
-                    else
-                        p_data = FixPES( p_mux, p_input->p_fifo );
@@ -1656 +1666 @@
-{
-    block_t *p_data;
-in
+size_
-
-    p_data = block_FifoShow( p_fifo );
@@ -1713 +1723 @@
-        return p_data;
-    }
+}
+
+static block_t *Add_ADTS( block_t *p_data, es_format_t *p_fmt )
+{
+    uint8_t *p_extra = p_fmt->p_extra;
+
+    if( !p_data || p_fmt->i_extra < 2 || !p_extra )
+        return p_data; /* no data to construct the headers */
+
+    int i_index = ( (p_extra[0] << 1) | (p_extra[1] >> 7) ) & 0x0f;
+    int i_profile = (p_extra[0] >> 3) - 1; /* i_profile < 4 */
+
+    if( i_index == 0x0f && p_fmt->i_extra < 5 )
+        return p_data; /* not enough data */
+
+    int i_channels = (p_extra[i_index == 0x0f ? 4 : 1] >> 3) & 0x0f;
+
+#define ADTS_HEADER_SIZE 7 /* CRC needs 2 more bytes */
+
+
+    /* keep a copy in case block_Realloc() fails */
+    block_t *p_bak_block = block_Duplicate( p_data );
+    if( !p_bak_block ) /* OOM, block_Realloc() is likely to lose our block */
+        return p_data; /* the frame isn't correct but that's the best we have */
+
+    block_t *p_new_block = block_Realloc( p_data, ADTS_HEADER_SIZE,
+                                            p_data->i_buffer );
+    if( !p_new_block )
+        return p_bak_block; /* OOM, send the (incorrect) original frame */
+
+    block_Release( p_bak_block ); /* we don't need the copy anymore */
+
+
+    uint8_t *p_buffer = p_new_block->p_buffer;
+
+    /* fixed header */
+    p_buffer[0] = 0xff;
+    p_buffer[1] = 0xf1; /* 0xf0 | 0x00 | 0x00 | 0x01 */
+    p_buffer[2] = (i_profile << 6) | ((i_index & 0x0f) << 2) | ((i_channels >> 2) & 0x01) ;
+    p_buffer[3] = (i_channels << 6) | ((p_data->i_buffer >> 11) & 0x03);
+
+    /* variable header (starts at last 2 bits of 4th byte) */
+
+    int i_fullness = 0x7ff; /* 0x7ff means VBR */
+    /* XXX: We should check if it's CBR or VBR, but no known implementation
+     * do that, and it's a pain to calculate this field */
+
+    p_buffer[4] = p_data->i_buffer >> 3;
+    p_buffer[5] = ((p_data->i_buffer & 0x07) << 5) | ((i_fullness >> 6) & 0x1f);
+    p_buffer[6] = ((i_fullness & 0x3f) << 2) /* | 0xfc */;
+
+    return p_new_block;
-}
-