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 33typedef 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 41static 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 68static 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 120static 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 129static const int libshine_sample_rates[] = { 130 44100, 48000, 32000, 0 131}; 132 133AVCodec 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}; 150