diff options
Diffstat (limited to 'libavcodec/libshine.c')
| -rw-r--r-- | libavcodec/libshine.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/libavcodec/libshine.c b/libavcodec/libshine.c new file mode 100644 index 0000000000..48333bb3c7 --- /dev/null +++ b/libavcodec/libshine.c @@ -0,0 +1,149 @@ +/* + * 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/intreadwrite.h" +#include "audio_frame_queue.h" +#include "avcodec.h" +#include "internal.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; + + if (avctx->channels <= 0 || avctx->channels > 2){ + av_log(avctx, AV_LOG_ERROR, "only mono or stereo is supported\n"); + return AVERROR(EINVAL); + } + + 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->channels == 2 ? STEREO : MONO; + s->config.wave.samplerate = avctx->sample_rate; + s->config.wave.channels = avctx->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; + long 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_alloc_packet2(avctx, avpkt, len))) + 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); + + avpkt->size = len; + *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 +}; + +AVCodec ff_libshine_encoder = { + .name = "libshine", + .long_name = NULL_IF_CONFIG_SMALL("libshine MP3 (MPEG audio layer 3)"), + .type = AVMEDIA_TYPE_AUDIO, + .id = AV_CODEC_ID_MP3, + .priv_data_size = sizeof(SHINEContext), + .init = libshine_encode_init, + .encode2 = libshine_encode_frame, + .close = libshine_encode_close, + .capabilities = CODEC_CAP_DELAY, + .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16P, + AV_SAMPLE_FMT_NONE }, + .supported_samplerates = libshine_sample_rates, + .channel_layouts = (const uint64_t[]) { AV_CH_LAYOUT_MONO, + AV_CH_LAYOUT_STEREO, + 0 }, +}; |