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![Andreas Rheinhardt](/assets/img/avatar_default.png)
Also include channel_layout.h directly wherever used. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
152 lines
5.0 KiB
C
152 lines
5.0 KiB
C
/*
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* Interface to libshine for mp3 encoding
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <shine/layer3.h>
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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "audio_frame_queue.h"
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#include "avcodec.h"
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#include "encode.h"
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#include "internal.h"
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#include "mpegaudio.h"
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#include "mpegaudiodecheader.h"
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#define BUFFER_SIZE (4096 * 20)
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typedef struct SHINEContext {
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shine_config_t config;
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shine_t shine;
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uint8_t buffer[BUFFER_SIZE];
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int buffer_index;
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AudioFrameQueue afq;
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} SHINEContext;
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static av_cold int libshine_encode_init(AVCodecContext *avctx)
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{
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SHINEContext *s = avctx->priv_data;
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if (avctx->channels <= 0 || avctx->channels > 2){
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av_log(avctx, AV_LOG_ERROR, "only mono or stereo is supported\n");
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return AVERROR(EINVAL);
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}
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shine_set_config_mpeg_defaults(&s->config.mpeg);
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if (avctx->bit_rate)
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s->config.mpeg.bitr = avctx->bit_rate / 1000;
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s->config.mpeg.mode = avctx->channels == 2 ? STEREO : MONO;
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s->config.wave.samplerate = avctx->sample_rate;
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s->config.wave.channels = avctx->channels == 2 ? PCM_STEREO : PCM_MONO;
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if (shine_check_config(s->config.wave.samplerate, s->config.mpeg.bitr) < 0) {
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av_log(avctx, AV_LOG_ERROR, "invalid configuration\n");
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return AVERROR(EINVAL);
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}
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s->shine = shine_initialise(&s->config);
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if (!s->shine)
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return AVERROR(ENOMEM);
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avctx->frame_size = shine_samples_per_pass(s->shine);
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ff_af_queue_init(avctx, &s->afq);
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return 0;
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}
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static int libshine_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr)
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{
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SHINEContext *s = avctx->priv_data;
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MPADecodeHeader hdr;
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unsigned char *data;
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int written;
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int ret, len;
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if (frame)
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data = shine_encode_buffer(s->shine, (int16_t **)frame->data, &written);
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else
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data = shine_flush(s->shine, &written);
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if (written < 0)
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return -1;
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if (written > 0) {
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if (s->buffer_index + written > BUFFER_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "internal buffer too small\n");
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return AVERROR_BUG;
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}
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memcpy(s->buffer + s->buffer_index, data, written);
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s->buffer_index += written;
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}
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if (frame) {
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if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
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return ret;
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}
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if (s->buffer_index < 4 || !s->afq.frame_count)
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return 0;
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if (avpriv_mpegaudio_decode_header(&hdr, AV_RB32(s->buffer))) {
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av_log(avctx, AV_LOG_ERROR, "free format output not supported\n");
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return -1;
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}
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len = hdr.frame_size;
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if (len <= s->buffer_index) {
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if ((ret = ff_get_encode_buffer(avctx, avpkt, len, 0)))
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return ret;
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memcpy(avpkt->data, s->buffer, len);
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s->buffer_index -= len;
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memmove(s->buffer, s->buffer + len, s->buffer_index);
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ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
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&avpkt->duration);
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*got_packet_ptr = 1;
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}
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return 0;
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}
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static av_cold int libshine_encode_close(AVCodecContext *avctx)
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{
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SHINEContext *s = avctx->priv_data;
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ff_af_queue_close(&s->afq);
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shine_close(s->shine);
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return 0;
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}
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static const int libshine_sample_rates[] = {
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44100, 48000, 32000, 0
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};
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const AVCodec ff_libshine_encoder = {
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.name = "libshine",
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.long_name = NULL_IF_CONFIG_SMALL("libshine MP3 (MPEG audio layer 3)"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_MP3,
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.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
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.priv_data_size = sizeof(SHINEContext),
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.init = libshine_encode_init,
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.encode2 = libshine_encode_frame,
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.close = libshine_encode_close,
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.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P,
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AV_SAMPLE_FMT_NONE },
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.supported_samplerates = libshine_sample_rates,
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.channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO,
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AV_CH_LAYOUT_STEREO,
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0 },
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.wrapper_name = "libshine",
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};
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