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b945fed629
Explicitly identify decoder/encoder wrappers with a common name. This
saves API users from guessing by the name suffix. For example, they
don't have to guess that "h264_qsv" is the h264 QSV implementation, and
instead they can just check the AVCodec .codec and .wrapper_name fields.
Explicitly mark AVCodec entries that are hardware decoders or most
likely hardware decoders with new AV_CODEC_CAPs. The purpose is allowing
API users listing hardware decoders in a more generic way. The proposed
AVCodecHWConfig does not provide this information fully, because it's
concerned with decoder configuration, not information about the fact
whether the hardware is used or not.
AV_CODEC_CAP_HYBRID exists specifically for QSV, which can have software
implementations in case the hardware is not capable.
Based on a patch by Philip Langdale <philipl@overt.org>.
Merges Libav commit 47687a2f8a
.
142 lines
4.6 KiB
C
142 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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if ((err = ff_get_buffer(c, frame, 0)) < 0)
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return err;
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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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.long_name = NULL_IF_CONFIG_SMALL("Xiph CELT decoder using 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 = AV_CODEC_CAP_DR1,
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.wrapper_name = "libcelt",
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};
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