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2ba45a60 DM |
1 | /* |
2 | * Interface to libtwolame for mp2 encoding | |
3 | * Copyright (c) 2012 Paul B Mahol | |
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 | /** | |
23 | * @file | |
24 | * Interface to libtwolame for mp2 encoding. | |
25 | */ | |
26 | ||
27 | #include <twolame.h> | |
28 | ||
29 | #include "libavutil/common.h" | |
30 | #include "libavutil/opt.h" | |
31 | ||
32 | #include "avcodec.h" | |
33 | #include "internal.h" | |
34 | #include "mpegaudio.h" | |
35 | ||
36 | typedef struct TWOLAMEContext { | |
37 | AVClass *class; | |
38 | int mode; | |
39 | int psymodel; | |
40 | int energy; | |
41 | int error_protection; | |
42 | int copyright; | |
43 | int original; | |
44 | int verbosity; | |
45 | ||
46 | twolame_options *glopts; | |
47 | int64_t next_pts; | |
48 | } TWOLAMEContext; | |
49 | ||
50 | static av_cold int twolame_encode_close(AVCodecContext *avctx) | |
51 | { | |
52 | TWOLAMEContext *s = avctx->priv_data; | |
53 | twolame_close(&s->glopts); | |
54 | return 0; | |
55 | } | |
56 | ||
57 | static av_cold int twolame_encode_init(AVCodecContext *avctx) | |
58 | { | |
59 | TWOLAMEContext *s = avctx->priv_data; | |
60 | int ret; | |
61 | ||
62 | avctx->frame_size = TWOLAME_SAMPLES_PER_FRAME; | |
f6fa7814 | 63 | avctx->initial_padding = 512 - 32 + 1; |
2ba45a60 DM |
64 | |
65 | s->glopts = twolame_init(); | |
66 | if (!s->glopts) | |
67 | return AVERROR(ENOMEM); | |
68 | ||
69 | twolame_set_verbosity(s->glopts, s->verbosity); | |
70 | twolame_set_mode(s->glopts, s->mode); | |
71 | twolame_set_psymodel(s->glopts, s->psymodel); | |
72 | twolame_set_energy_levels(s->glopts, s->energy); | |
73 | twolame_set_error_protection(s->glopts, s->error_protection); | |
74 | twolame_set_copyright(s->glopts, s->copyright); | |
75 | twolame_set_original(s->glopts, s->original); | |
76 | ||
77 | twolame_set_num_channels(s->glopts, avctx->channels); | |
78 | twolame_set_in_samplerate(s->glopts, avctx->sample_rate); | |
79 | twolame_set_out_samplerate(s->glopts, avctx->sample_rate); | |
80 | ||
81 | if (!avctx->bit_rate) | |
82 | avctx->bit_rate = avctx->sample_rate < 28000 ? 160000 : 384000; | |
83 | ||
84 | if (avctx->flags & CODEC_FLAG_QSCALE || !avctx->bit_rate) { | |
85 | twolame_set_VBR(s->glopts, TRUE); | |
86 | twolame_set_VBR_level(s->glopts, | |
87 | avctx->global_quality / (float) FF_QP2LAMBDA); | |
88 | av_log(avctx, AV_LOG_WARNING, | |
89 | "VBR in MP2 is a hack, use another codec that supports it.\n"); | |
90 | } else { | |
91 | twolame_set_bitrate(s->glopts, avctx->bit_rate / 1000); | |
92 | } | |
93 | ||
94 | ret = twolame_init_params(s->glopts); | |
95 | if (ret) { | |
96 | twolame_encode_close(avctx); | |
97 | return AVERROR_UNKNOWN; | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static int twolame_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, | |
104 | const AVFrame *frame, int *got_packet_ptr) | |
105 | { | |
106 | TWOLAMEContext *s = avctx->priv_data; | |
107 | int ret; | |
108 | ||
109 | if ((ret = ff_alloc_packet2(avctx, avpkt, MPA_MAX_CODED_FRAME_SIZE)) < 0) | |
110 | return ret; | |
111 | ||
112 | if (frame) { | |
113 | switch (avctx->sample_fmt) { | |
114 | case AV_SAMPLE_FMT_FLT: | |
115 | ret = twolame_encode_buffer_float32_interleaved(s->glopts, | |
116 | (const float *)frame->data[0], | |
117 | frame->nb_samples, | |
118 | avpkt->data, | |
119 | avpkt->size); | |
120 | break; | |
121 | case AV_SAMPLE_FMT_FLTP: | |
122 | ret = twolame_encode_buffer_float32(s->glopts, | |
123 | (const float *)frame->data[0], | |
124 | (const float *)frame->data[1], | |
125 | frame->nb_samples, | |
126 | avpkt->data, avpkt->size); | |
127 | break; | |
128 | case AV_SAMPLE_FMT_S16: | |
129 | ret = twolame_encode_buffer_interleaved(s->glopts, | |
130 | (const short int *)frame->data[0], | |
131 | frame->nb_samples, | |
132 | avpkt->data, avpkt->size); | |
133 | break; | |
134 | case AV_SAMPLE_FMT_S16P: | |
135 | ret = twolame_encode_buffer(s->glopts, | |
136 | (const short int *)frame->data[0], | |
137 | (const short int *)frame->data[1], | |
138 | frame->nb_samples, | |
139 | avpkt->data, avpkt->size); | |
140 | break; | |
141 | default: | |
142 | av_log(avctx, AV_LOG_ERROR, | |
143 | "Unsupported sample format %d.\n", avctx->sample_fmt); | |
144 | return AVERROR_BUG; | |
145 | } | |
146 | } else { | |
147 | ret = twolame_encode_flush(s->glopts, avpkt->data, avpkt->size); | |
148 | } | |
149 | ||
150 | if (!ret) // no bytes written | |
151 | return 0; | |
152 | if (ret < 0) // twolame error | |
153 | return AVERROR_UNKNOWN; | |
154 | ||
2ba45a60 | 155 | if (frame) { |
f6fa7814 | 156 | avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples); |
2ba45a60 | 157 | if (frame->pts != AV_NOPTS_VALUE) |
f6fa7814 | 158 | avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding); |
2ba45a60 DM |
159 | } else { |
160 | avpkt->pts = s->next_pts; | |
161 | } | |
162 | // this is for setting pts for flushed packet(s). | |
163 | if (avpkt->pts != AV_NOPTS_VALUE) | |
164 | s->next_pts = avpkt->pts + avpkt->duration; | |
165 | ||
166 | av_shrink_packet(avpkt, ret); | |
167 | *got_packet_ptr = 1; | |
168 | return 0; | |
169 | } | |
170 | ||
171 | #define OFFSET(x) offsetof(TWOLAMEContext, x) | |
172 | #define AE AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM | |
173 | static const AVOption options[] = { | |
174 | { "mode", "Mpeg Mode", OFFSET(mode), AV_OPT_TYPE_INT, { .i64 = TWOLAME_AUTO_MODE }, TWOLAME_AUTO_MODE, TWOLAME_MONO, AE, "mode"}, | |
175 | { "auto", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_AUTO_MODE }, 0, 0, AE, "mode" }, | |
176 | { "stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_STEREO }, 0, 0, AE, "mode" }, | |
177 | { "joint_stereo", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_JOINT_STEREO }, 0, 0, AE, "mode" }, | |
178 | { "dual_channel", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_DUAL_CHANNEL }, 0, 0, AE, "mode" }, | |
179 | { "mono", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = TWOLAME_MONO }, 0, 0, AE, "mode" }, | |
180 | { "psymodel", "Psychoacoustic Model", OFFSET(psymodel), AV_OPT_TYPE_INT, { .i64 = 3 }, -1, 4, AE}, | |
181 | { "energy_levels","enable energy levels", OFFSET(energy), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE}, | |
182 | { "error_protection","enable CRC error protection", OFFSET(error_protection), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE}, | |
183 | { "copyright", "set MPEG Audio Copyright flag", OFFSET(copyright), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE}, | |
184 | { "original", "set MPEG Audio Original flag", OFFSET(original), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, AE}, | |
185 | { "verbosity", "set library optput level (0-10)", OFFSET(verbosity), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 10, AE}, | |
186 | { NULL }, | |
187 | }; | |
188 | ||
189 | static const AVClass twolame_class = { | |
190 | .class_name = "libtwolame encoder", | |
191 | .item_name = av_default_item_name, | |
192 | .option = options, | |
193 | .version = LIBAVUTIL_VERSION_INT, | |
194 | }; | |
195 | ||
196 | static const AVCodecDefault twolame_defaults[] = { | |
197 | { "b", "0" }, | |
198 | { NULL }, | |
199 | }; | |
200 | ||
201 | static const int twolame_samplerates[] = { | |
202 | 16000, 22050, 24000, 32000, 44100, 48000, 0 | |
203 | }; | |
204 | ||
205 | AVCodec ff_libtwolame_encoder = { | |
206 | .name = "libtwolame", | |
207 | .long_name = NULL_IF_CONFIG_SMALL("libtwolame MP2 (MPEG audio layer 2)"), | |
208 | .type = AVMEDIA_TYPE_AUDIO, | |
209 | .id = AV_CODEC_ID_MP2, | |
210 | .priv_data_size = sizeof(TWOLAMEContext), | |
211 | .init = twolame_encode_init, | |
212 | .encode2 = twolame_encode_frame, | |
213 | .close = twolame_encode_close, | |
214 | .capabilities = CODEC_CAP_DELAY, | |
215 | .defaults = twolame_defaults, | |
216 | .priv_class = &twolame_class, | |
217 | .sample_fmts = (const enum AVSampleFormat[]) { | |
218 | AV_SAMPLE_FMT_FLT, | |
219 | AV_SAMPLE_FMT_FLTP, | |
220 | AV_SAMPLE_FMT_S16, | |
221 | AV_SAMPLE_FMT_S16P, | |
222 | AV_SAMPLE_FMT_NONE | |
223 | }, | |
224 | .channel_layouts = (const uint64_t[]) { | |
225 | AV_CH_LAYOUT_MONO, | |
226 | AV_CH_LAYOUT_STEREO, | |
227 | 0 }, | |
228 | .supported_samplerates = twolame_samplerates, | |
229 | }; |