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[ffmpeg] / libavcodec / mpeg4audio.c

diff --git a/libavcodec/mpeg4audio.c b/libavcodec/mpeg4audio.c
index 91ea2b7c9b3c16bbaf282d1c0e4a4731a526d182..f9951b1604ea269b54999b6b782962deee29c076 100644 (file)
--- a/libavcodec/mpeg4audio.c
+++ b/libavcodec/mpeg4audio.c
@@ -1,6 +1,7 @@
 /*
  * MPEG-4 Audio common code
  * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
+ * Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
  *
  * This file is part of FFmpeg.
  *
@@ -20,8 +21,37 @@
  */
 
 #include "get_bits.h"
+#include "put_bits.h"
 #include "mpeg4audio.h"
 
+/**
+ * Parse MPEG-4 audio configuration for ALS object type.
+ * @param[in] gb       bit reader context
+ * @param[in] c        MPEG4AudioConfig structure to fill
+ * @return on success 0 is returned, otherwise a value < 0
+ */
+static int parse_config_ALS(GetBitContext *gb, MPEG4AudioConfig *c)
+{
+    if (get_bits_left(gb) < 112)
+        return -1;
+
+    if (get_bits_long(gb, 32) != MKBETAG('A','L','S','\0'))
+        return -1;
+
+    // override AudioSpecificConfig channel configuration and sample rate
+    // which are buggy in old ALS conformance files
+    c->sample_rate = get_bits_long(gb, 32);
+
+    // skip number of samples
+    skip_bits_long(gb, 32);
+
+    // read number of channels
+    c->chan_config = 0;
+    c->channels    = get_bits(gb, 16) + 1;
+
+    return 0;
+}
+
 const int ff_mpeg4audio_sample_rates[16] = {
     96000, 88200, 64000, 48000, 44100, 32000,
     24000, 22050, 16000, 12000, 11025, 8000, 7350
@@ -34,7 +64,7 @@ const uint8_t ff_mpeg4audio_channels[8] = {
 static inline int get_object_type(GetBitContext *gb)
 {
     int object_type = get_bits(gb, 5);
-    if (object_type == 31)
+    if (object_type == AOT_ESCAPE)
         object_type = 32 + get_bits(gb, 6);
     return object_type;
 }
@@ -55,32 +85,99 @@ int ff_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_si
     c->object_type = get_object_type(&gb);
     c->sample_rate = get_sample_rate(&gb, &c->sampling_index);
     c->chan_config = get_bits(&gb, 4);
+    if (c->chan_config < FF_ARRAY_ELEMS(ff_mpeg4audio_channels))
+        c->channels = ff_mpeg4audio_channels[c->chan_config];
     c->sbr = -1;
-    if (c->object_type == 5) {
-        c->ext_object_type = c->object_type;
+    c->ps  = -1;
+    if (c->object_type == AOT_SBR || (c->object_type == AOT_PS &&
+        // check for W6132 Annex YYYY draft MP3onMP4
+        !(show_bits(&gb, 3) & 0x03 && !(show_bits(&gb, 9) & 0x3F)))) {
+        if (c->object_type == AOT_PS)
+            c->ps = 1;
+        c->ext_object_type = AOT_SBR;
         c->sbr = 1;
         c->ext_sample_rate = get_sample_rate(&gb, &c->ext_sampling_index);
         c->object_type = get_object_type(&gb);
         if (c->object_type == AOT_ER_BSAC)
             c->ext_chan_config = get_bits(&gb, 4);
     } else {
-        c->ext_object_type = 0;
+        c->ext_object_type = AOT_NULL;
         c->ext_sample_rate = 0;
     }
     specific_config_bitindex = get_bits_count(&gb);
 
-    if (c->ext_object_type != 5) {
-        int bits_left = buf_size*8 - specific_config_bitindex;
-        for (; bits_left > 15; bits_left--) {
+    if (c->object_type == AOT_ALS) {
+        skip_bits(&gb, 5);
+        if (show_bits_long(&gb, 24) != MKBETAG('\0','A','L','S'))
+            skip_bits_long(&gb, 24);
+
+        specific_config_bitindex = get_bits_count(&gb);
+
+        if (parse_config_ALS(&gb, c))
+            return -1;
+    }
+
+    if (c->ext_object_type != AOT_SBR) {
+        while (get_bits_left(&gb) > 15) {
             if (show_bits(&gb, 11) == 0x2b7) { // sync extension
                 get_bits(&gb, 11);
                 c->ext_object_type = get_object_type(&gb);
-                if (c->ext_object_type == 5 && (c->sbr = get_bits1(&gb)) == 1)
+                if (c->ext_object_type == AOT_SBR && (c->sbr = get_bits1(&gb)) == 1)
                     c->ext_sample_rate = get_sample_rate(&gb, &c->ext_sampling_index);
+                if (get_bits_left(&gb) > 11 && get_bits(&gb, 11) == 0x548)
+                    c->ps = get_bits1(&gb);
                 break;
             } else
                 get_bits1(&gb); // skip 1 bit
         }
     }
+
+    //PS requires SBR
+    if (!c->sbr)
+        c->ps = 0;
+    //Limit implicit PS to the HE-AACv2 Profile
+    if ((c->ps == -1 && c->object_type != AOT_AAC_LC) || c->channels & ~0x01)
+        c->ps = 0;
+
     return specific_config_bitindex;
 }
+
+static av_always_inline unsigned int copy_bits(PutBitContext *pb,
+                                               GetBitContext *gb,
+                                               int bits)
+{
+    unsigned int el = get_bits(gb, bits);
+    put_bits(pb, bits, el);
+    return el;
+}
+
+int ff_copy_pce_data(PutBitContext *pb, GetBitContext *gb)
+{
+    int five_bit_ch, four_bit_ch, comment_size, bits;
+    int offset = put_bits_count(pb);
+
+    copy_bits(pb, gb, 10);                  //Tag, Object Type, Frequency
+    five_bit_ch  = copy_bits(pb, gb, 4);    //Front
+    five_bit_ch += copy_bits(pb, gb, 4);    //Side
+    five_bit_ch += copy_bits(pb, gb, 4);    //Back
+    four_bit_ch  = copy_bits(pb, gb, 2);    //LFE
+    four_bit_ch += copy_bits(pb, gb, 3);    //Data
+    five_bit_ch += copy_bits(pb, gb, 4);    //Coupling
+    if (copy_bits(pb, gb, 1))               //Mono Mixdown
+        copy_bits(pb, gb, 4);
+    if (copy_bits(pb, gb, 1))               //Stereo Mixdown
+        copy_bits(pb, gb, 4);
+    if (copy_bits(pb, gb, 1))               //Matrix Mixdown
+        copy_bits(pb, gb, 3);
+    for (bits = five_bit_ch*5+four_bit_ch*4; bits > 16; bits -= 16)
+        copy_bits(pb, gb, 16);
+    if (bits)
+        copy_bits(pb, gb, bits);
+    align_put_bits(pb);
+    align_get_bits(gb);
+    comment_size = copy_bits(pb, gb, 8);
+    for (; comment_size > 0; comment_size--)
+        copy_bits(pb, gb, 8);
+
+    return put_bits_count(pb) - offset;
+}