144 lines
4.6 KiB
C
144 lines
4.6 KiB
C
/*
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* Xiph CELT decoder using libcelt
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* Copyright (c) 2011 Nicolas George
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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 <celt/celt.h>
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#include <celt/celt_header.h>
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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/intreadwrite.h"
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struct libcelt_context {
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CELTMode *mode;
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CELTDecoder *dec;
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int discard;
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};
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static int ff_celt_error_to_averror(int err)
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{
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switch (err) {
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case CELT_BAD_ARG: return AVERROR(EINVAL);
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#ifdef CELT_BUFFER_TOO_SMALL
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case CELT_BUFFER_TOO_SMALL: return AVERROR(ENOBUFS);
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#endif
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case CELT_INTERNAL_ERROR: return AVERROR(EFAULT);
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case CELT_CORRUPTED_DATA: return AVERROR_INVALIDDATA;
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case CELT_UNIMPLEMENTED: return AVERROR(ENOSYS);
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#ifdef ENOTRECOVERABLE
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case CELT_INVALID_STATE: return AVERROR(ENOTRECOVERABLE);
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#endif
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case CELT_ALLOC_FAIL: return AVERROR(ENOMEM);
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default: return AVERROR(EINVAL);
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}
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}
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static int ff_celt_bitstream_version_hack(CELTMode *mode)
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{
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CELTHeader header = { .version_id = 0 };
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celt_header_init(&header, mode, 960, 2);
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return header.version_id;
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}
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static av_cold int libcelt_dec_init(AVCodecContext *c)
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{
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struct libcelt_context *celt = c->priv_data;
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int err;
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if (!c->channels || !c->frame_size ||
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c->frame_size > INT_MAX / sizeof(int16_t) / c->channels)
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return AVERROR(EINVAL);
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celt->mode = celt_mode_create(c->sample_rate, c->frame_size, &err);
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if (!celt->mode)
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return ff_celt_error_to_averror(err);
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celt->dec = celt_decoder_create_custom(celt->mode, c->channels, &err);
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if (!celt->dec) {
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celt_mode_destroy(celt->mode);
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return ff_celt_error_to_averror(err);
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}
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if (c->extradata_size >= 4) {
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celt->discard = AV_RL32(c->extradata);
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if (celt->discard < 0 || celt->discard >= c->frame_size) {
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av_log(c, AV_LOG_WARNING,
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"Invalid overlap (%d), ignored.\n", celt->discard);
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celt->discard = 0;
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}
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}
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if (c->extradata_size >= 8) {
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unsigned version = AV_RL32(c->extradata + 4);
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unsigned lib_version = ff_celt_bitstream_version_hack(celt->mode);
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if (version != lib_version)
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av_log(c, AV_LOG_WARNING,
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"CELT bitstream version 0x%x may be "
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"improperly decoded by libcelt for version 0x%x.\n",
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version, lib_version);
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}
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c->sample_fmt = AV_SAMPLE_FMT_S16;
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return 0;
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}
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static av_cold int libcelt_dec_close(AVCodecContext *c)
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{
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struct libcelt_context *celt = c->priv_data;
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celt_decoder_destroy(celt->dec);
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celt_mode_destroy(celt->mode);
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return 0;
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}
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static int libcelt_dec_decode(AVCodecContext *c, void *data,
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int *got_frame_ptr, AVPacket *pkt)
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{
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struct libcelt_context *celt = c->priv_data;
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AVFrame *frame = data;
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int err;
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int16_t *pcm;
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frame->nb_samples = c->frame_size;
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err = ff_get_buffer(c, frame);
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if (err < 0) {
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av_log(c, AV_LOG_ERROR, "get_buffer() failed\n");
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return err;
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}
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pcm = (int16_t *)frame->data[0];
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err = celt_decode(celt->dec, pkt->data, pkt->size, pcm, c->frame_size);
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if (err < 0)
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return ff_celt_error_to_averror(err);
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if (celt->discard) {
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frame->nb_samples -= celt->discard;
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memmove(pcm, pcm + celt->discard * c->channels,
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frame->nb_samples * c->channels * sizeof(int16_t));
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celt->discard = 0;
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}
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*got_frame_ptr = 1;
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return pkt->size;
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}
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AVCodec ff_libcelt_decoder = {
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.name = "libcelt",
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_CELT,
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.priv_data_size = sizeof(struct libcelt_context),
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.init = libcelt_dec_init,
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.close = libcelt_dec_close,
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.decode = libcelt_dec_decode,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Xiph CELT decoder using libcelt"),
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};
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