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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 | long 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))) | |
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 = 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 | }; |