1 |
|
|
/* |
2 |
|
|
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |
3 |
|
|
* |
4 |
|
|
* This file is part of FFmpeg. |
5 |
|
|
* |
6 |
|
|
* FFmpeg is free software; you can redistribute it and/or |
7 |
|
|
* modify it under the terms of the GNU Lesser General Public |
8 |
|
|
* License as published by the Free Software Foundation; either |
9 |
|
|
* version 2.1 of the License, or (at your option) any later version. |
10 |
|
|
* |
11 |
|
|
* FFmpeg is distributed in the hope that it will be useful, |
12 |
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 |
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 |
|
|
* Lesser General Public License for more details. |
15 |
|
|
* |
16 |
|
|
* You should have received a copy of the GNU Lesser General Public |
17 |
|
|
* License along with FFmpeg; if not, write to the Free Software |
18 |
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 |
|
|
*/ |
20 |
|
|
|
21 |
|
|
#include "libavutil/common.h" |
22 |
|
|
#include "libavutil/intreadwrite.h" |
23 |
|
|
#include "avcodec.h" |
24 |
|
|
#include "bsf.h" |
25 |
|
|
#include "mpegaudiodecheader.h" |
26 |
|
|
#include "mpegaudiodata.h" |
27 |
|
|
|
28 |
|
|
|
29 |
|
|
static int mp3_header_decompress(AVBSFContext *ctx, AVPacket *out) |
30 |
|
|
{ |
31 |
|
|
AVPacket *in; |
32 |
|
|
uint32_t header; |
33 |
|
|
int sample_rate= ctx->par_in->sample_rate; |
34 |
|
|
int sample_rate_index=0; |
35 |
|
|
int lsf, mpeg25, bitrate_index, frame_size, ret; |
36 |
|
|
uint8_t *buf; |
37 |
|
|
int buf_size; |
38 |
|
|
|
39 |
|
|
ret = ff_bsf_get_packet(ctx, &in); |
40 |
|
|
if (ret < 0) |
41 |
|
|
return ret; |
42 |
|
|
|
43 |
|
|
buf = in->data; |
44 |
|
|
buf_size = in->size; |
45 |
|
|
|
46 |
|
|
header = AV_RB32(buf); |
47 |
|
|
if(ff_mpa_check_header(header) >= 0){ |
48 |
|
|
av_packet_move_ref(out, in); |
49 |
|
|
av_packet_free(&in); |
50 |
|
|
|
51 |
|
|
return 0; |
52 |
|
|
} |
53 |
|
|
|
54 |
|
|
if(ctx->par_in->extradata_size != 15 || strcmp(ctx->par_in->extradata, "FFCMP3 0.0")){ |
55 |
|
|
av_log(ctx, AV_LOG_ERROR, "Extradata invalid %d\n", ctx->par_in->extradata_size); |
56 |
|
|
ret = AVERROR(EINVAL); |
57 |
|
|
goto fail; |
58 |
|
|
} |
59 |
|
|
|
60 |
|
|
header= AV_RB32(ctx->par_in->extradata+11) & MP3_MASK; |
61 |
|
|
|
62 |
|
|
lsf = sample_rate < (24000+32000)/2; |
63 |
|
|
mpeg25 = sample_rate < (12000+16000)/2; |
64 |
|
|
sample_rate_index= (header>>10)&3; |
65 |
|
|
if (sample_rate_index == 3) { |
66 |
|
|
ret = AVERROR_INVALIDDATA; |
67 |
|
|
goto fail; |
68 |
|
|
} |
69 |
|
|
|
70 |
|
|
sample_rate= avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off |
71 |
|
|
|
72 |
|
|
for(bitrate_index=2; bitrate_index<30; bitrate_index++){ |
73 |
|
|
frame_size = avpriv_mpa_bitrate_tab[lsf][2][bitrate_index>>1]; |
74 |
|
|
frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1); |
75 |
|
|
if(frame_size == buf_size + 4) |
76 |
|
|
break; |
77 |
|
|
if(frame_size == buf_size + 6) |
78 |
|
|
break; |
79 |
|
|
} |
80 |
|
|
if(bitrate_index == 30){ |
81 |
|
|
av_log(ctx, AV_LOG_ERROR, "Could not find bitrate_index.\n"); |
82 |
|
|
ret = AVERROR(EINVAL); |
83 |
|
|
goto fail; |
84 |
|
|
} |
85 |
|
|
|
86 |
|
|
header |= (bitrate_index&1)<<9; |
87 |
|
|
header |= (bitrate_index>>1)<<12; |
88 |
|
|
header |= (frame_size == buf_size + 4)<<16; //FIXME actually set a correct crc instead of 0 |
89 |
|
|
|
90 |
|
|
ret = av_new_packet(out, frame_size); |
91 |
|
|
if (ret < 0) |
92 |
|
|
goto fail; |
93 |
|
|
ret = av_packet_copy_props(out, in); |
94 |
|
|
if (ret < 0) { |
95 |
|
|
av_packet_unref(out); |
96 |
|
|
goto fail; |
97 |
|
|
} |
98 |
|
|
memcpy(out->data + frame_size - buf_size, buf, buf_size + AV_INPUT_BUFFER_PADDING_SIZE); |
99 |
|
|
|
100 |
|
|
if(ctx->par_in->channels==2){ |
101 |
|
|
uint8_t *p= out->data + frame_size - buf_size; |
102 |
|
|
if(lsf){ |
103 |
|
|
FFSWAP(int, p[1], p[2]); |
104 |
|
|
header |= (p[1] & 0xC0)>>2; |
105 |
|
|
p[1] &= 0x3F; |
106 |
|
|
}else{ |
107 |
|
|
header |= p[1] & 0x30; |
108 |
|
|
p[1] &= 0xCF; |
109 |
|
|
} |
110 |
|
|
} |
111 |
|
|
|
112 |
|
|
AV_WB32(out->data, header); |
113 |
|
|
|
114 |
|
|
ret = 0; |
115 |
|
|
|
116 |
|
|
fail: |
117 |
|
|
av_packet_free(&in); |
118 |
|
|
return ret; |
119 |
|
|
} |
120 |
|
|
|
121 |
|
|
static const enum AVCodecID codec_ids[] = { |
122 |
|
|
AV_CODEC_ID_MP3, AV_CODEC_ID_NONE, |
123 |
|
|
}; |
124 |
|
|
|
125 |
|
|
const AVBitStreamFilter ff_mp3_header_decompress_bsf = { |
126 |
|
|
.name = "mp3decomp", |
127 |
|
|
.filter = mp3_header_decompress, |
128 |
|
|
.codec_ids = codec_ids, |
129 |
|
|
}; |