blob: 12d71e7acbb726e61ead3e24e1ba4d22b64598a2
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; |
63 | avctx->initial_padding = 512 - 32 + 1; |
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 & AV_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)) < 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 | |
155 | if (frame) { |
156 | avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples); |
157 | if (frame->pts != AV_NOPTS_VALUE) |
158 | avpkt->pts = frame->pts - ff_samples_to_time_base(avctx, avctx->initial_padding); |
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 = AV_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 | }; |
230 |