yading@10: /* yading@10: * Interface to libshine for mp3 encoding yading@10: * Copyright (c) 2012 Paul B Mahol yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: #include yading@10: yading@10: #include "libavutil/intreadwrite.h" yading@10: #include "audio_frame_queue.h" yading@10: #include "avcodec.h" yading@10: #include "internal.h" yading@10: #include "mpegaudio.h" yading@10: #include "mpegaudiodecheader.h" yading@10: yading@10: #define BUFFER_SIZE (4096 * 20) yading@10: yading@10: typedef struct SHINEContext { yading@10: shine_config_t config; yading@10: shine_t shine; yading@10: uint8_t buffer[BUFFER_SIZE]; yading@10: int buffer_index; yading@10: AudioFrameQueue afq; yading@10: } SHINEContext; yading@10: yading@10: static av_cold int libshine_encode_init(AVCodecContext *avctx) yading@10: { yading@10: SHINEContext *s = avctx->priv_data; yading@10: yading@10: if (avctx->channels <= 0 || avctx->channels > 2){ yading@10: av_log(avctx, AV_LOG_ERROR, "only mono or stereo is supported\n"); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: yading@10: shine_set_config_mpeg_defaults(&s->config.mpeg); yading@10: if (avctx->bit_rate) yading@10: s->config.mpeg.bitr = avctx->bit_rate / 1000; yading@10: if (shine_find_bitrate_index(s->config.mpeg.bitr) < 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid bitrate\n"); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: s->config.mpeg.mode = avctx->channels == 2 ? STEREO : MONO; yading@10: s->config.wave.samplerate = avctx->sample_rate; yading@10: s->config.wave.channels = avctx->channels == 2 ? PCM_STEREO : PCM_MONO; yading@10: s->shine = shine_initialise(&s->config); yading@10: if (!s->shine) yading@10: return AVERROR(ENOMEM); yading@10: avctx->frame_size = samp_per_frame; yading@10: ff_af_queue_init(avctx, &s->afq); yading@10: return 0; yading@10: } yading@10: yading@10: static int libshine_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, yading@10: const AVFrame *frame, int *got_packet_ptr) yading@10: { yading@10: SHINEContext *s = avctx->priv_data; yading@10: MPADecodeHeader hdr; yading@10: unsigned char *data; yading@10: long written; yading@10: int ret, len; yading@10: yading@10: if (frame) yading@10: data = shine_encode_frame(s->shine, frame->data[0], &written); yading@10: else yading@10: data = shine_flush(s->shine, &written); yading@10: if (written < 0) yading@10: return -1; yading@10: if (written > 0) { yading@10: if (s->buffer_index + written > BUFFER_SIZE) { yading@10: av_log(avctx, AV_LOG_ERROR, "internal buffer too small\n"); yading@10: return AVERROR_BUG; yading@10: } yading@10: memcpy(s->buffer + s->buffer_index, data, written); yading@10: s->buffer_index += written; yading@10: } yading@10: if (frame) { yading@10: if ((ret = ff_af_queue_add(&s->afq, frame)) < 0) yading@10: return ret; yading@10: } yading@10: yading@10: if (s->buffer_index < 4 || !s->afq.frame_count) yading@10: return 0; yading@10: if (avpriv_mpegaudio_decode_header(&hdr, AV_RB32(s->buffer))) { yading@10: av_log(avctx, AV_LOG_ERROR, "free format output not supported\n"); yading@10: return -1; yading@10: } yading@10: yading@10: len = hdr.frame_size; yading@10: if (len <= s->buffer_index) { yading@10: if ((ret = ff_alloc_packet2(avctx, avpkt, len))) yading@10: return ret; yading@10: memcpy(avpkt->data, s->buffer, len); yading@10: s->buffer_index -= len; yading@10: memmove(s->buffer, s->buffer + len, s->buffer_index); yading@10: yading@10: ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts, yading@10: &avpkt->duration); yading@10: yading@10: avpkt->size = len; yading@10: *got_packet_ptr = 1; yading@10: } yading@10: return 0; yading@10: } yading@10: yading@10: static av_cold int libshine_encode_close(AVCodecContext *avctx) yading@10: { yading@10: SHINEContext *s = avctx->priv_data; yading@10: yading@10: ff_af_queue_close(&s->afq); yading@10: shine_close(s->shine); yading@10: return 0; yading@10: } yading@10: yading@10: static const int libshine_sample_rates[] = { yading@10: 44100, 48000, 32000, 0 yading@10: }; yading@10: yading@10: AVCodec ff_libshine_encoder = { yading@10: .name = "libshine", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = CODEC_ID_MP3, yading@10: .priv_data_size = sizeof(SHINEContext), yading@10: .init = libshine_encode_init, yading@10: .encode2 = libshine_encode_frame, yading@10: .close = libshine_encode_close, yading@10: .capabilities = CODEC_CAP_DELAY, yading@10: .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P, yading@10: AV_SAMPLE_FMT_NONE }, yading@10: .supported_samplerates = libshine_sample_rates, yading@10: .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, yading@10: AV_CH_LAYOUT_STEREO, yading@10: 0 }, yading@10: .long_name = NULL_IF_CONFIG_SMALL("libshine MP3 (MPEG audio layer 3)"), yading@10: };