| /* |
| * Interface to libshine for mp3 encoding |
| * Copyright (c) 2012 Paul B Mahol |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include <shine/layer3.h> |
| |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/intreadwrite.h" |
| #include "audio_frame_queue.h" |
| #include "avcodec.h" |
| #include "codec_internal.h" |
| #include "encode.h" |
| #include "mpegaudio.h" |
| #include "mpegaudiodecheader.h" |
| |
| #define BUFFER_SIZE (4096 * 20) |
| |
| typedef struct SHINEContext { |
| shine_config_t config; |
| shine_t shine; |
| uint8_t buffer[BUFFER_SIZE]; |
| int buffer_index; |
| AudioFrameQueue afq; |
| } SHINEContext; |
| |
| static av_cold int libshine_encode_init(AVCodecContext *avctx) |
| { |
| SHINEContext *s = avctx->priv_data; |
| |
| shine_set_config_mpeg_defaults(&s->config.mpeg); |
| if (avctx->bit_rate) |
| s->config.mpeg.bitr = avctx->bit_rate / 1000; |
| s->config.mpeg.mode = avctx->ch_layout.nb_channels == 2 ? STEREO : MONO; |
| s->config.wave.samplerate = avctx->sample_rate; |
| s->config.wave.channels = avctx->ch_layout.nb_channels == 2 ? PCM_STEREO : PCM_MONO; |
| if (shine_check_config(s->config.wave.samplerate, s->config.mpeg.bitr) < 0) { |
| av_log(avctx, AV_LOG_ERROR, "invalid configuration\n"); |
| return AVERROR(EINVAL); |
| } |
| s->shine = shine_initialise(&s->config); |
| if (!s->shine) |
| return AVERROR(ENOMEM); |
| avctx->frame_size = shine_samples_per_pass(s->shine); |
| ff_af_queue_init(avctx, &s->afq); |
| return 0; |
| } |
| |
| static int libshine_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, |
| const AVFrame *frame, int *got_packet_ptr) |
| { |
| SHINEContext *s = avctx->priv_data; |
| MPADecodeHeader hdr; |
| unsigned char *data; |
| int written; |
| int ret, len; |
| |
| if (frame) |
| data = shine_encode_buffer(s->shine, (int16_t **)frame->data, &written); |
| else |
| data = shine_flush(s->shine, &written); |
| if (written < 0) |
| return -1; |
| if (written > 0) { |
| if (s->buffer_index + written > BUFFER_SIZE) { |
| av_log(avctx, AV_LOG_ERROR, "internal buffer too small\n"); |
| return AVERROR_BUG; |
| } |
| memcpy(s->buffer + s->buffer_index, data, written); |
| s->buffer_index += written; |
| } |
| if (frame) { |
| if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) |
| return ret; |
| } |
| |
| if (s->buffer_index < 4 || !s->afq.frame_count) |
| return 0; |
| if (avpriv_mpegaudio_decode_header(&hdr, AV_RB32(s->buffer))) { |
| av_log(avctx, AV_LOG_ERROR, "free format output not supported\n"); |
| return -1; |
| } |
| |
| len = hdr.frame_size; |
| if (len <= s->buffer_index) { |
| if ((ret = ff_get_encode_buffer(avctx, avpkt, len, 0))) |
| return ret; |
| memcpy(avpkt->data, s->buffer, len); |
| s->buffer_index -= len; |
| memmove(s->buffer, s->buffer + len, s->buffer_index); |
| |
| ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, |
| &avpkt->duration); |
| |
| *got_packet_ptr = 1; |
| } |
| return 0; |
| } |
| |
| static av_cold int libshine_encode_close(AVCodecContext *avctx) |
| { |
| SHINEContext *s = avctx->priv_data; |
| |
| ff_af_queue_close(&s->afq); |
| shine_close(s->shine); |
| return 0; |
| } |
| |
| static const int libshine_sample_rates[] = { |
| 44100, 48000, 32000, 0 |
| }; |
| |
| const FFCodec ff_libshine_encoder = { |
| .p.name = "libshine", |
| CODEC_LONG_NAME("libshine MP3 (MPEG audio layer 3)"), |
| .p.type = AVMEDIA_TYPE_AUDIO, |
| .p.id = AV_CODEC_ID_MP3, |
| .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY, |
| .caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE, |
| .priv_data_size = sizeof(SHINEContext), |
| .init = libshine_encode_init, |
| FF_CODEC_ENCODE_CB(libshine_encode_frame), |
| .close = libshine_encode_close, |
| .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P, |
| AV_SAMPLE_FMT_NONE }, |
| .p.supported_samplerates = libshine_sample_rates, |
| .p.ch_layouts = (const AVChannelLayout[]) { AV_CHANNEL_LAYOUT_MONO, |
| AV_CHANNEL_LAYOUT_STEREO, |
| { 0 }, |
| }, |
| .p.wrapper_name = "libshine", |
| }; |