mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Paul B Mahol <onemda@gmail.com>pull/21/head
Paul B Mahol
13 years ago
parent
fb78b94c3a
commit
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4 changed files with 157 additions and 0 deletions
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/*
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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/intreadwrite.h" |
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#include "audio_frame_queue.h" |
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#include "avcodec.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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if (shine_find_bitrate_index(s->config.mpeg.bitr) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "invalid bitrate\n"); |
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return AVERROR(EINVAL); |
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} |
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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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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 = samp_per_frame; |
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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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long written; |
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int ret, len; |
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if (frame) |
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data = shine_encode_frame(s->shine, frame->data[0], &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_alloc_packet2(avctx, avpkt, len))) |
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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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avpkt->size = len; |
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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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AVCodec ff_libshine_encoder = { |
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.name = "libshine", |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = CODEC_ID_MP3, |
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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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.capabilities = CODEC_CAP_DELAY, |
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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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.long_name = NULL_IF_CONFIG_SMALL("libshine MP3 (MPEG audio layer 3)"), |
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}; |
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