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-rw-r--r--libavcodec/libcelt_dec.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/libavcodec/libcelt_dec.c b/libavcodec/libcelt_dec.c
new file mode 100644
index 0000000000..6f3965401c
--- /dev/null
+++ b/libavcodec/libcelt_dec.c
@@ -0,0 +1,136 @@
+/*
+ * Xiph CELT / Opus decoder using libcelt
+ * Copyright (c) 2011 Nicolas George
+ *
+ * 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 <celt/celt.h>
+#include <celt/celt_header.h>
+#include "avcodec.h"
+#include "libavutil/intreadwrite.h"
+
+struct libcelt_context {
+ CELTMode *mode;
+ CELTDecoder *dec;
+ int frame_bytes;
+ int discard;
+};
+
+static int ff_celt_error_to_averror(int err)
+{
+ switch(err) {
+ case CELT_BAD_ARG: return AVERROR(EINVAL);
+#ifdef CELT_BUFFER_TOO_SMALL
+ case CELT_BUFFER_TOO_SMALL: return AVERROR(ENOBUFS);
+#endif
+ case CELT_INTERNAL_ERROR: return AVERROR(EFAULT);
+ case CELT_CORRUPTED_DATA: return AVERROR_INVALIDDATA;
+ case CELT_UNIMPLEMENTED: return AVERROR(ENOTSUP);
+#ifdef ENOTRECOVERABLE
+ case CELT_INVALID_STATE: return AVERROR(ENOTRECOVERABLE);
+#endif
+ case CELT_ALLOC_FAIL: return AVERROR(ENOMEM);
+ default: return AVERROR(EINVAL);
+ }
+}
+
+static int ff_celt_bitstream_version_hack(CELTMode *mode)
+{
+ CELTHeader header = { .version_id = 0 };
+ celt_header_init(&header, mode, 960, 2);
+ return header.version_id;
+}
+
+static av_cold int libcelt_dec_init(AVCodecContext *c)
+{
+ struct libcelt_context *celt = c->priv_data;
+ int err;
+
+ if (!c->channels || !c->frame_size ||
+ c->frame_size > INT_MAX / sizeof(int16_t) / c->channels)
+ return AVERROR(EINVAL);
+ celt->frame_bytes = c->frame_size * c->channels * sizeof(int16_t);
+ celt->mode = celt_mode_create(c->sample_rate, c->frame_size, &err);
+ if (!celt->mode)
+ return ff_celt_error_to_averror(err);
+ celt->dec = celt_decoder_create_custom(celt->mode, c->channels, &err);
+ if (!celt->dec) {
+ celt_mode_destroy(celt->mode);
+ return ff_celt_error_to_averror(err);
+ }
+ if (c->extradata_size >= 4) {
+ celt->discard = AV_RL32(c->extradata);
+ if (celt->discard < 0 || celt->discard >= c->frame_size) {
+ av_log(c, AV_LOG_WARNING,
+ "Invalid overlap (%d), ignored.\n", celt->discard);
+ celt->discard = 0;
+ }
+ celt->discard *= c->channels * sizeof(int16_t);
+ }
+ if(c->extradata_size >= 8) {
+ unsigned version = AV_RL32(c->extradata + 4);
+ unsigned lib_version = ff_celt_bitstream_version_hack(celt->mode);
+ if (version != lib_version)
+ av_log(c, AV_LOG_WARNING,
+ "CELT bitstream version 0x%x may be "
+ "improperly decoded by libcelt for version 0x%x.\n",
+ version, lib_version);
+ }
+ return 0;
+}
+
+static av_cold int libcelt_dec_close(AVCodecContext *c)
+{
+ struct libcelt_context *celt = c->priv_data;
+
+ celt_decoder_destroy(celt->dec);
+ celt_mode_destroy(celt->mode);
+ return 0;
+}
+
+static int libcelt_dec_decode(AVCodecContext *c, void *pcm, int *pcm_size,
+ AVPacket *pkt)
+{
+ struct libcelt_context *celt = c->priv_data;
+ int err;
+
+ if (*pcm_size < celt->frame_bytes)
+ return AVERROR(ENOBUFS);
+ err = celt_decode(celt->dec, pkt->data, pkt->size, pcm, c->frame_size);
+ if (err < 0)
+ return ff_celt_error_to_averror(err);
+ *pcm_size = celt->frame_bytes;
+ if (celt->discard) {
+ *pcm_size = celt->frame_bytes - celt->discard;
+ memmove(pcm, (char *)pcm + celt->discard, *pcm_size);
+ celt->discard = 0;
+ }
+ return pkt->size;
+}
+
+AVCodec ff_libcelt_decoder = {
+ .name = "libcelt",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = CODEC_ID_CELT,
+ .priv_data_size = sizeof(struct libcelt_context),
+ .init = libcelt_dec_init,
+ .close = libcelt_dec_close,
+ .decode = libcelt_dec_decode,
+ .capabilities = 0,
+ .long_name = NULL_IF_CONFIG_SMALL("Xiph CELT/Opus decoder using libcelt"),
+};