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1 | /* |
2 | * ADTS muxer. | |
3 | * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com> | |
4 | * Mans Rullgard <mans@mansr.com> | |
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 "libavcodec/get_bits.h" | |
24 | #include "libavcodec/put_bits.h" | |
25 | #include "libavcodec/avcodec.h" | |
26 | #include "libavcodec/mpeg4audio.h" | |
27 | #include "libavutil/opt.h" | |
28 | #include "avformat.h" | |
29 | #include "apetag.h" | |
30 | #include "id3v2.h" | |
31 | ||
32 | #define ADTS_HEADER_SIZE 7 | |
33 | ||
34 | typedef struct { | |
35 | AVClass *class; | |
36 | int write_adts; | |
37 | int objecttype; | |
38 | int sample_rate_index; | |
39 | int channel_conf; | |
40 | int pce_size; | |
41 | int apetag; | |
42 | int id3v2tag; | |
43 | uint8_t pce_data[MAX_PCE_SIZE]; | |
44 | } ADTSContext; | |
45 | ||
46 | #define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1) | |
47 | ||
f6fa7814 | 48 | static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size) |
2ba45a60 DM |
49 | { |
50 | GetBitContext gb; | |
51 | PutBitContext pb; | |
52 | MPEG4AudioConfig m4ac; | |
53 | int off; | |
54 | ||
55 | init_get_bits(&gb, buf, size * 8); | |
56 | off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1); | |
57 | if (off < 0) | |
58 | return off; | |
59 | skip_bits_long(&gb, off); | |
60 | adts->objecttype = m4ac.object_type - 1; | |
61 | adts->sample_rate_index = m4ac.sampling_index; | |
62 | adts->channel_conf = m4ac.chan_config; | |
63 | ||
64 | if (adts->objecttype > 3U) { | |
65 | av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1); | |
66 | return AVERROR_INVALIDDATA; | |
67 | } | |
68 | if (adts->sample_rate_index == 15) { | |
69 | av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n"); | |
70 | return AVERROR_INVALIDDATA; | |
71 | } | |
72 | if (get_bits(&gb, 1)) { | |
73 | av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n"); | |
74 | return AVERROR_INVALIDDATA; | |
75 | } | |
76 | if (get_bits(&gb, 1)) { | |
77 | av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n"); | |
78 | return AVERROR_INVALIDDATA; | |
79 | } | |
80 | if (get_bits(&gb, 1)) { | |
81 | av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n"); | |
82 | return AVERROR_INVALIDDATA; | |
83 | } | |
84 | if (!adts->channel_conf) { | |
85 | init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE); | |
86 | ||
87 | put_bits(&pb, 3, 5); //ID_PCE | |
88 | adts->pce_size = (avpriv_copy_pce_data(&pb, &gb) + 3) / 8; | |
89 | flush_put_bits(&pb); | |
90 | } | |
91 | ||
92 | adts->write_adts = 1; | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static int adts_write_header(AVFormatContext *s) | |
98 | { | |
99 | ADTSContext *adts = s->priv_data; | |
100 | AVCodecContext *avc = s->streams[0]->codec; | |
101 | ||
102 | if (adts->id3v2tag) | |
103 | ff_id3v2_write_simple(s, 4, ID3v2_DEFAULT_MAGIC); | |
104 | if (avc->extradata_size > 0) | |
105 | return adts_decode_extradata(s, adts, avc->extradata, | |
106 | avc->extradata_size); | |
107 | ||
108 | return 0; | |
109 | } | |
110 | ||
111 | static int adts_write_frame_header(ADTSContext *ctx, | |
112 | uint8_t *buf, int size, int pce_size) | |
113 | { | |
114 | PutBitContext pb; | |
115 | ||
116 | unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size; | |
117 | if (full_frame_size > ADTS_MAX_FRAME_BYTES) { | |
118 | av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n", | |
119 | full_frame_size, ADTS_MAX_FRAME_BYTES); | |
120 | return AVERROR_INVALIDDATA; | |
121 | } | |
122 | ||
123 | init_put_bits(&pb, buf, ADTS_HEADER_SIZE); | |
124 | ||
125 | /* adts_fixed_header */ | |
126 | put_bits(&pb, 12, 0xfff); /* syncword */ | |
127 | put_bits(&pb, 1, 0); /* ID */ | |
128 | put_bits(&pb, 2, 0); /* layer */ | |
129 | put_bits(&pb, 1, 1); /* protection_absent */ | |
130 | put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */ | |
131 | put_bits(&pb, 4, ctx->sample_rate_index); | |
132 | put_bits(&pb, 1, 0); /* private_bit */ | |
133 | put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */ | |
134 | put_bits(&pb, 1, 0); /* original_copy */ | |
135 | put_bits(&pb, 1, 0); /* home */ | |
136 | ||
137 | /* adts_variable_header */ | |
138 | put_bits(&pb, 1, 0); /* copyright_identification_bit */ | |
139 | put_bits(&pb, 1, 0); /* copyright_identification_start */ | |
140 | put_bits(&pb, 13, full_frame_size); /* aac_frame_length */ | |
141 | put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */ | |
142 | put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */ | |
143 | ||
144 | flush_put_bits(&pb); | |
145 | ||
146 | return 0; | |
147 | } | |
148 | ||
149 | static int adts_write_packet(AVFormatContext *s, AVPacket *pkt) | |
150 | { | |
151 | ADTSContext *adts = s->priv_data; | |
152 | AVIOContext *pb = s->pb; | |
153 | uint8_t buf[ADTS_HEADER_SIZE]; | |
154 | ||
155 | if (!pkt->size) | |
156 | return 0; | |
157 | if (adts->write_adts) { | |
158 | int err = adts_write_frame_header(adts, buf, pkt->size, | |
159 | adts->pce_size); | |
160 | if (err < 0) | |
161 | return err; | |
162 | avio_write(pb, buf, ADTS_HEADER_SIZE); | |
163 | if (adts->pce_size) { | |
164 | avio_write(pb, adts->pce_data, adts->pce_size); | |
165 | adts->pce_size = 0; | |
166 | } | |
167 | } | |
168 | avio_write(pb, pkt->data, pkt->size); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static int adts_write_trailer(AVFormatContext *s) | |
174 | { | |
175 | ADTSContext *adts = s->priv_data; | |
176 | ||
177 | if (adts->apetag) | |
178 | ff_ape_write_tag(s); | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | #define ENC AV_OPT_FLAG_ENCODING_PARAM | |
184 | #define OFFSET(obj) offsetof(ADTSContext, obj) | |
185 | static const AVOption options[] = { | |
186 | { "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC}, | |
187 | { "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC}, | |
188 | { NULL }, | |
189 | }; | |
190 | ||
191 | static const AVClass adts_muxer_class = { | |
192 | .class_name = "ADTS muxer", | |
193 | .item_name = av_default_item_name, | |
194 | .option = options, | |
195 | .version = LIBAVUTIL_VERSION_INT, | |
196 | }; | |
197 | ||
198 | AVOutputFormat ff_adts_muxer = { | |
199 | .name = "adts", | |
200 | .long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"), | |
201 | .mime_type = "audio/aac", | |
202 | .extensions = "aac,adts", | |
203 | .priv_data_size = sizeof(ADTSContext), | |
204 | .audio_codec = AV_CODEC_ID_AAC, | |
205 | .video_codec = AV_CODEC_ID_NONE, | |
206 | .write_header = adts_write_header, | |
207 | .write_packet = adts_write_packet, | |
208 | .write_trailer = adts_write_trailer, | |
209 | .priv_class = &adts_muxer_class, | |
210 | .flags = AVFMT_NOTIMESTAMPS, | |
211 | }; |