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1 | /* |
2 | * Common AAC and AC-3 parser | |
3 | * Copyright (c) 2003 Fabrice Bellard | |
4 | * Copyright (c) 2003 Michael Niedermayer | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include "libavutil/channel_layout.h" | |
24 | #include "libavutil/common.h" | |
25 | #include "parser.h" | |
26 | #include "aac_ac3_parser.h" | |
27 | ||
28 | int ff_aac_ac3_parse(AVCodecParserContext *s1, | |
29 | AVCodecContext *avctx, | |
30 | const uint8_t **poutbuf, int *poutbuf_size, | |
31 | const uint8_t *buf, int buf_size) | |
32 | { | |
33 | AACAC3ParseContext *s = s1->priv_data; | |
34 | ParseContext *pc = &s->pc; | |
35 | int len, i; | |
36 | int new_frame_start; | |
37 | ||
38 | get_next: | |
39 | i=END_NOT_FOUND; | |
40 | if(s->remaining_size <= buf_size){ | |
41 | if(s->remaining_size && !s->need_next_header){ | |
42 | i= s->remaining_size; | |
43 | s->remaining_size = 0; | |
44 | }else{ //we need a header first | |
45 | len=0; | |
46 | for(i=s->remaining_size; i<buf_size; i++){ | |
47 | s->state = (s->state<<8) + buf[i]; | |
48 | if((len=s->sync(s->state, s, &s->need_next_header, &new_frame_start))) | |
49 | break; | |
50 | } | |
51 | if(len<=0){ | |
52 | i=END_NOT_FOUND; | |
53 | }else{ | |
54 | s->state=0; | |
55 | i-= s->header_size -1; | |
56 | s->remaining_size = len; | |
57 | if(!new_frame_start || pc->index+i<=0){ | |
58 | s->remaining_size += i; | |
59 | goto get_next; | |
60 | } | |
61 | } | |
62 | } | |
63 | } | |
64 | ||
65 | if(ff_combine_frame(pc, i, &buf, &buf_size)<0){ | |
66 | s->remaining_size -= FFMIN(s->remaining_size, buf_size); | |
67 | *poutbuf = NULL; | |
68 | *poutbuf_size = 0; | |
69 | return buf_size; | |
70 | } | |
71 | ||
72 | *poutbuf = buf; | |
73 | *poutbuf_size = buf_size; | |
74 | ||
75 | /* update codec info */ | |
76 | if(s->codec_id) | |
77 | avctx->codec_id = s->codec_id; | |
78 | ||
79 | /* Due to backwards compatible HE-AAC the sample rate, channel count, | |
80 | and total number of samples found in an AAC ADTS header are not | |
81 | reliable. Bit rate is still accurate because the total frame duration in | |
82 | seconds is still correct (as is the number of bits in the frame). */ | |
83 | if (avctx->codec_id != AV_CODEC_ID_AAC) { | |
84 | avctx->sample_rate = s->sample_rate; | |
85 | ||
86 | /* (E-)AC-3: allow downmixing to stereo or mono */ | |
87 | #if FF_API_REQUEST_CHANNELS | |
88 | FF_DISABLE_DEPRECATION_WARNINGS | |
89 | if (avctx->request_channels == 1) | |
90 | avctx->request_channel_layout = AV_CH_LAYOUT_MONO; | |
91 | else if (avctx->request_channels == 2) | |
92 | avctx->request_channel_layout = AV_CH_LAYOUT_STEREO; | |
93 | FF_ENABLE_DEPRECATION_WARNINGS | |
94 | #endif | |
95 | if (s->channels > 1 && | |
96 | avctx->request_channel_layout == AV_CH_LAYOUT_MONO) { | |
97 | avctx->channels = 1; | |
98 | avctx->channel_layout = AV_CH_LAYOUT_MONO; | |
99 | } else if (s->channels > 2 && | |
100 | avctx->request_channel_layout == AV_CH_LAYOUT_STEREO) { | |
101 | avctx->channels = 2; | |
102 | avctx->channel_layout = AV_CH_LAYOUT_STEREO; | |
103 | } else { | |
104 | avctx->channels = s->channels; | |
105 | avctx->channel_layout = s->channel_layout; | |
106 | } | |
107 | s1->duration = s->samples; | |
108 | avctx->audio_service_type = s->service_type; | |
109 | } | |
110 | ||
111 | avctx->bit_rate = s->bit_rate; | |
112 | ||
113 | return i; | |
114 | } |