blob: f4cf5981bcb79992c42f4a359088b3f14788845e
1 | /* |
2 | * Interface to libshine for mp3 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 | #include <shine/layer3.h> |
23 | |
24 | #include "libavutil/intreadwrite.h" |
25 | #include "audio_frame_queue.h" |
26 | #include "avcodec.h" |
27 | #include "internal.h" |
28 | #include "mpegaudio.h" |
29 | #include "mpegaudiodecheader.h" |
30 | |
31 | #define BUFFER_SIZE (4096 * 20) |
32 | |
33 | typedef struct SHINEContext { |
34 | shine_config_t config; |
35 | shine_t shine; |
36 | uint8_t buffer[BUFFER_SIZE]; |
37 | int buffer_index; |
38 | AudioFrameQueue afq; |
39 | } SHINEContext; |
40 | |
41 | static av_cold int libshine_encode_init(AVCodecContext *avctx) |
42 | { |
43 | SHINEContext *s = avctx->priv_data; |
44 | |
45 | if (avctx->channels <= 0 || avctx->channels > 2){ |
46 | av_log(avctx, AV_LOG_ERROR, "only mono or stereo is supported\n"); |
47 | return AVERROR(EINVAL); |
48 | } |
49 | |
50 | shine_set_config_mpeg_defaults(&s->config.mpeg); |
51 | if (avctx->bit_rate) |
52 | s->config.mpeg.bitr = avctx->bit_rate / 1000; |
53 | s->config.mpeg.mode = avctx->channels == 2 ? STEREO : MONO; |
54 | s->config.wave.samplerate = avctx->sample_rate; |
55 | s->config.wave.channels = avctx->channels == 2 ? PCM_STEREO : PCM_MONO; |
56 | if (shine_check_config(s->config.wave.samplerate, s->config.mpeg.bitr) < 0) { |
57 | av_log(avctx, AV_LOG_ERROR, "invalid configuration\n"); |
58 | return AVERROR(EINVAL); |
59 | } |
60 | s->shine = shine_initialise(&s->config); |
61 | if (!s->shine) |
62 | return AVERROR(ENOMEM); |
63 | avctx->frame_size = shine_samples_per_pass(s->shine); |
64 | ff_af_queue_init(avctx, &s->afq); |
65 | return 0; |
66 | } |
67 | |
68 | static int libshine_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
69 | const AVFrame *frame, int *got_packet_ptr) |
70 | { |
71 | SHINEContext *s = avctx->priv_data; |
72 | MPADecodeHeader hdr; |
73 | unsigned char *data; |
74 | int written; |
75 | int ret, len; |
76 | |
77 | if (frame) |
78 | data = shine_encode_buffer(s->shine, (int16_t **)frame->data, &written); |
79 | else |
80 | data = shine_flush(s->shine, &written); |
81 | if (written < 0) |
82 | return -1; |
83 | if (written > 0) { |
84 | if (s->buffer_index + written > BUFFER_SIZE) { |
85 | av_log(avctx, AV_LOG_ERROR, "internal buffer too small\n"); |
86 | return AVERROR_BUG; |
87 | } |
88 | memcpy(s->buffer + s->buffer_index, data, written); |
89 | s->buffer_index += written; |
90 | } |
91 | if (frame) { |
92 | if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) |
93 | return ret; |
94 | } |
95 | |
96 | if (s->buffer_index < 4 || !s->afq.frame_count) |
97 | return 0; |
98 | if (avpriv_mpegaudio_decode_header(&hdr, AV_RB32(s->buffer))) { |
99 | av_log(avctx, AV_LOG_ERROR, "free format output not supported\n"); |
100 | return -1; |
101 | } |
102 | |
103 | len = hdr.frame_size; |
104 | if (len <= s->buffer_index) { |
105 | if ((ret = ff_alloc_packet2(avctx, avpkt, len, 0))) |
106 | return ret; |
107 | memcpy(avpkt->data, s->buffer, len); |
108 | s->buffer_index -= len; |
109 | memmove(s->buffer, s->buffer + len, s->buffer_index); |
110 | |
111 | ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, |
112 | &avpkt->duration); |
113 | |
114 | avpkt->size = len; |
115 | *got_packet_ptr = 1; |
116 | } |
117 | return 0; |
118 | } |
119 | |
120 | static av_cold int libshine_encode_close(AVCodecContext *avctx) |
121 | { |
122 | SHINEContext *s = avctx->priv_data; |
123 | |
124 | ff_af_queue_close(&s->afq); |
125 | shine_close(s->shine); |
126 | return 0; |
127 | } |
128 | |
129 | static const int libshine_sample_rates[] = { |
130 | 44100, 48000, 32000, 0 |
131 | }; |
132 | |
133 | AVCodec ff_libshine_encoder = { |
134 | .name = "libshine", |
135 | .long_name = NULL_IF_CONFIG_SMALL("libshine MP3 (MPEG audio layer 3)"), |
136 | .type = AVMEDIA_TYPE_AUDIO, |
137 | .id = AV_CODEC_ID_MP3, |
138 | .priv_data_size = sizeof(SHINEContext), |
139 | .init = libshine_encode_init, |
140 | .encode2 = libshine_encode_frame, |
141 | .close = libshine_encode_close, |
142 | .capabilities = AV_CODEC_CAP_DELAY, |
143 | .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P, |
144 | AV_SAMPLE_FMT_NONE }, |
145 | .supported_samplerates = libshine_sample_rates, |
146 | .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, |
147 | AV_CH_LAYOUT_STEREO, |
148 | 0 }, |
149 | }; |
150 |