/*
* 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.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "get_bits.h"
+#include "put_bits.h"
#include "mpeg4audio.h"
-const int ff_mpeg4audio_sample_rates[16] = {
+/**
+ * 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 AVERROR_INVALIDDATA;
+
+ if (get_bits_long(gb, 32) != MKBETAG('A','L','S','\0'))
+ return AVERROR_INVALIDDATA;
+
+ // 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 avpriv_mpeg4audio_sample_rates[16] = {
96000, 88200, 64000, 48000, 44100, 32000,
24000, 22050, 16000, 12000, 11025, 8000, 7350
};
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;
}
{
*index = get_bits(gb, 4);
return *index == 0x0f ? get_bits(gb, 24) :
- ff_mpeg4audio_sample_rates[*index];
+ avpriv_mpeg4audio_sample_rates[*index];
}
-int ff_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_size)
+int avpriv_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf,
+ int bit_size, int sync_extension)
{
GetBitContext gb;
- int specific_config_bitindex;
+ int specific_config_bitindex, ret;
- init_get_bits(&gb, buf, buf_size*8);
+ ret = init_get_bits(&gb, buf, bit_size);
+ if (ret < 0)
+ return ret;
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);
+
+ ret = parse_config_ALS(&gb, c);
+ if (ret < 0)
+ return ret;
+ }
+
+ if (c->ext_object_type != AOT_SBR && sync_extension) {
+ 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 avpriv_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);
+ avpriv_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;
+}
projects / ffmpeg / blobdiff