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1 | /* |
2 | * AST muxer | |
3 | * Copyright (c) 2012 James Almer | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "avformat.h" | |
23 | #include "avio_internal.h" | |
24 | #include "internal.h" | |
25 | #include "ast.h" | |
26 | #include "libavutil/mathematics.h" | |
27 | #include "libavutil/opt.h" | |
28 | ||
29 | typedef struct ASTMuxContext { | |
30 | AVClass *class; | |
31 | int64_t size; | |
32 | int64_t samples; | |
33 | int64_t loopstart; | |
34 | int64_t loopend; | |
35 | int fbs; | |
36 | } ASTMuxContext; | |
37 | ||
38 | #define CHECK_LOOP(type) \ | |
39 | if (ast->loop ## type > 0) { \ | |
40 | ast->loop ## type = av_rescale_rnd(ast->loop ## type, enc->sample_rate, 1000, AV_ROUND_DOWN); \ | |
41 | if (ast->loop ## type < 0 || ast->loop ## type > UINT_MAX) { \ | |
42 | av_log(s, AV_LOG_ERROR, "Invalid loop" #type " value\n"); \ | |
43 | return AVERROR(EINVAL); \ | |
44 | } \ | |
45 | } | |
46 | ||
47 | static int ast_write_header(AVFormatContext *s) | |
48 | { | |
49 | ASTMuxContext *ast = s->priv_data; | |
50 | AVIOContext *pb = s->pb; | |
51 | AVCodecContext *enc; | |
52 | unsigned int codec_tag; | |
53 | ||
54 | if (s->nb_streams == 1) { | |
55 | enc = s->streams[0]->codec; | |
56 | } else { | |
57 | av_log(s, AV_LOG_ERROR, "only one stream is supported\n"); | |
58 | return AVERROR(EINVAL); | |
59 | } | |
60 | ||
61 | if (enc->codec_id == AV_CODEC_ID_ADPCM_AFC) { | |
62 | av_log(s, AV_LOG_ERROR, "muxing ADPCM AFC is not implemented\n"); | |
63 | return AVERROR_PATCHWELCOME; | |
64 | } | |
65 | ||
66 | codec_tag = ff_codec_get_tag(ff_codec_ast_tags, enc->codec_id); | |
67 | if (!codec_tag) { | |
68 | av_log(s, AV_LOG_ERROR, "unsupported codec\n"); | |
69 | return AVERROR(EINVAL); | |
70 | } | |
71 | ||
72 | if (ast->loopend > 0 && ast->loopstart >= ast->loopend) { | |
73 | av_log(s, AV_LOG_ERROR, "loopend can't be less or equal to loopstart\n"); | |
74 | return AVERROR(EINVAL); | |
75 | } | |
76 | ||
77 | /* Convert milliseconds to samples */ | |
78 | CHECK_LOOP(start) | |
79 | CHECK_LOOP(end) | |
80 | ||
81 | ffio_wfourcc(pb, "STRM"); | |
82 | ||
83 | ast->size = avio_tell(pb); | |
84 | avio_wb32(pb, 0); /* File size minus header */ | |
85 | avio_wb16(pb, codec_tag); | |
86 | avio_wb16(pb, 16); /* Bit depth */ | |
87 | avio_wb16(pb, enc->channels); | |
88 | avio_wb16(pb, 0); /* Loop flag */ | |
89 | avio_wb32(pb, enc->sample_rate); | |
90 | ||
91 | ast->samples = avio_tell(pb); | |
92 | avio_wb32(pb, 0); /* Number of samples */ | |
93 | avio_wb32(pb, 0); /* Loopstart */ | |
94 | avio_wb32(pb, 0); /* Loopend */ | |
95 | avio_wb32(pb, 0); /* Size of first block */ | |
96 | ||
97 | /* Unknown */ | |
98 | avio_wb32(pb, 0); | |
99 | avio_wl32(pb, 0x7F); | |
100 | avio_wb64(pb, 0); | |
101 | avio_wb64(pb, 0); | |
102 | avio_wb32(pb, 0); | |
103 | ||
104 | avio_flush(pb); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int ast_write_packet(AVFormatContext *s, AVPacket *pkt) | |
110 | { | |
111 | AVIOContext *pb = s->pb; | |
112 | ASTMuxContext *ast = s->priv_data; | |
113 | AVCodecContext *enc = s->streams[0]->codec; | |
114 | int size = pkt->size / enc->channels; | |
115 | ||
116 | if (s->streams[0]->nb_frames == 0) | |
117 | ast->fbs = size; | |
118 | ||
119 | ffio_wfourcc(pb, "BLCK"); | |
120 | avio_wb32(pb, size); /* Block size */ | |
121 | ||
122 | /* padding */ | |
123 | avio_wb64(pb, 0); | |
124 | avio_wb64(pb, 0); | |
125 | avio_wb64(pb, 0); | |
126 | ||
127 | avio_write(pb, pkt->data, pkt->size); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | static int ast_write_trailer(AVFormatContext *s) | |
133 | { | |
134 | AVIOContext *pb = s->pb; | |
135 | ASTMuxContext *ast = s->priv_data; | |
136 | AVCodecContext *enc = s->streams[0]->codec; | |
137 | int64_t file_size = avio_tell(pb); | |
138 | int64_t samples = (file_size - 64 - (32 * s->streams[0]->nb_frames)) / enc->block_align; /* PCM_S16BE_PLANAR */ | |
139 | ||
140 | av_log(s, AV_LOG_DEBUG, "total samples: %"PRId64"\n", samples); | |
141 | ||
142 | if (s->pb->seekable) { | |
143 | /* Number of samples */ | |
144 | avio_seek(pb, ast->samples, SEEK_SET); | |
145 | avio_wb32(pb, samples); | |
146 | ||
147 | /* Loopstart if provided */ | |
148 | if (ast->loopstart > 0) { | |
149 | if (ast->loopstart >= samples) { | |
150 | av_log(s, AV_LOG_WARNING, "Loopstart value is out of range and will be ignored\n"); | |
151 | ast->loopstart = -1; | |
152 | avio_skip(pb, 4); | |
153 | } else | |
154 | avio_wb32(pb, ast->loopstart); | |
155 | } else | |
156 | avio_skip(pb, 4); | |
157 | ||
158 | /* Loopend if provided. Otherwise number of samples again */ | |
159 | if (ast->loopend && ast->loopstart >= 0) { | |
160 | if (ast->loopend > samples) { | |
161 | av_log(s, AV_LOG_WARNING, "Loopend value is out of range and will be ignored\n"); | |
162 | ast->loopend = samples; | |
163 | } | |
164 | avio_wb32(pb, ast->loopend); | |
165 | } else { | |
166 | avio_wb32(pb, samples); | |
167 | } | |
168 | ||
169 | /* Size of first block */ | |
170 | avio_wb32(pb, ast->fbs); | |
171 | ||
172 | /* File size minus header */ | |
173 | avio_seek(pb, ast->size, SEEK_SET); | |
174 | avio_wb32(pb, file_size - 64); | |
175 | ||
176 | /* Loop flag */ | |
177 | if (ast->loopstart >= 0) { | |
178 | avio_skip(pb, 6); | |
179 | avio_wb16(pb, 0xFFFF); | |
180 | } | |
181 | ||
182 | avio_seek(pb, file_size, SEEK_SET); | |
183 | avio_flush(pb); | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
188 | #define OFFSET(obj) offsetof(ASTMuxContext, obj) | |
189 | static const AVOption options[] = { | |
190 | { "loopstart", "Loopstart position in milliseconds.", OFFSET(loopstart), AV_OPT_TYPE_INT64, { .i64 = -1 }, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, | |
191 | { "loopend", "Loopend position in milliseconds.", OFFSET(loopend), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, | |
192 | { NULL }, | |
193 | }; | |
194 | ||
195 | static const AVClass ast_muxer_class = { | |
196 | .class_name = "AST muxer", | |
197 | .item_name = av_default_item_name, | |
198 | .option = options, | |
199 | .version = LIBAVUTIL_VERSION_INT, | |
200 | }; | |
201 | ||
202 | AVOutputFormat ff_ast_muxer = { | |
203 | .name = "ast", | |
204 | .long_name = NULL_IF_CONFIG_SMALL("AST (Audio Stream)"), | |
205 | .extensions = "ast", | |
206 | .priv_data_size = sizeof(ASTMuxContext), | |
207 | .audio_codec = AV_CODEC_ID_PCM_S16BE_PLANAR, | |
208 | .video_codec = AV_CODEC_ID_NONE, | |
209 | .write_header = ast_write_header, | |
210 | .write_packet = ast_write_packet, | |
211 | .write_trailer = ast_write_trailer, | |
212 | .priv_class = &ast_muxer_class, | |
213 | .codec_tag = (const AVCodecTag* const []){ff_codec_ast_tags, 0}, | |
214 | }; |