[FFmpeg-cvslog] Xiph CELT/Opus decoder using libcelt.
Nicolas George
git at videolan.org
Wed Apr 20 11:11:29 CEST 2011
ffmpeg | branch: master | Nicolas George <nicolas.george at normalesup.org> | Sat Apr 16 17:45:30 2011 +0200| [89451dd6e4da40ed73b8bbee2d48d8d8be1d5b0c] | committer: Nicolas George
Xiph CELT/Opus decoder using libcelt.
Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=89451dd6e4da40ed73b8bbee2d48d8d8be1d5b0c
---
configure | 5 ++
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/libcelt_dec.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 141 insertions(+), 0 deletions(-)
diff --git a/configure b/configure
index 6275648..3cacb26 100755
--- a/configure
+++ b/configure
@@ -161,6 +161,7 @@ Configuration options:
External library support:
--enable-avisynth enable reading of AVISynth script files [no]
--enable-bzlib enable bzlib [autodetect]
+ --enable-libcelt enable CELT/Opus decoding via libcelt [no]
--enable-frei0r enable frei0r video filtering
--enable-libopencore-amrnb enable AMR-NB de/encoding via libopencore-amrnb [no]
--enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]
@@ -929,6 +930,7 @@ CONFIG_LIST="
h264pred
hardcoded_tables
huffman
+ libcelt
libdc1394
libdirac
libfaac
@@ -1393,6 +1395,7 @@ vdpau_deps="vdpau_vdpau_h vdpau_vdpau_x11_h"
h264_parser_select="golomb h264dsp h264pred"
# external libraries
+libcelt_decoder_deps="libcelt"
libdirac_decoder_deps="libdirac !libschroedinger"
libdirac_encoder_deps="libdirac"
libfaac_encoder_deps="libfaac"
@@ -2888,6 +2891,7 @@ check_mathfunc truncf
# these are off by default, so fail if requested and not available
enabled avisynth && require2 vfw32 "windows.h vfw.h" AVIFileInit -lavifil32
+enabled libcelt && require libcelt celt/celt.h celt_decode -lcelt0
enabled frei0r && { check_header frei0r.h || die "ERROR: frei0r.h header not found"; }
enabled libdirac && require_pkg_config dirac \
"libdirac_decoder/dirac_parser.h libdirac_encoder/dirac_encoder.h" \
@@ -3167,6 +3171,7 @@ echo "threading support ${thread_type-no}"
echo "SDL support ${sdl-no}"
echo "Sun medialib support ${mlib-no}"
echo "AVISynth enabled ${avisynth-no}"
+echo "libcelt enabled ${libcelt-no}"
echo "frei0r enabled ${frei0r-no}"
echo "libdc1394 support ${libdc1394-no}"
echo "libdirac enabled ${libdirac-no}"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index aa7390b..df2cda0 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -553,6 +553,7 @@ OBJS-$(CONFIG_WEBM_MUXER) += xiph.o mpeg4audio.o \
mpegaudiodata.o
# external codec libraries
+OBJS-$(CONFIG_LIBCELT_DECODER) += libcelt_dec.o
OBJS-$(CONFIG_LIBDIRAC_DECODER) += libdiracdec.o
OBJS-$(CONFIG_LIBDIRAC_ENCODER) += libdiracenc.o libdirac_libschro.o
OBJS-$(CONFIG_LIBFAAC_ENCODER) += libfaac.o
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index 56fa628..eade67f 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -365,6 +365,7 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (XSUB, xsub);
/* external libraries */
+ REGISTER_DECODER (LIBCELT, libcelt);
REGISTER_ENCDEC (LIBDIRAC, libdirac);
REGISTER_ENCODER (LIBFAAC, libfaac);
REGISTER_ENCDEC (LIBGSM, libgsm);
diff --git a/libavcodec/libcelt_dec.c b/libavcodec/libcelt_dec.c
new file mode 100644
index 0000000..3e52ab5
--- /dev/null
+++ b/libavcodec/libcelt_dec.c
@@ -0,0 +1,134 @@
+/*
+ * 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);
+ case CELT_INVALID_STATE: return AVERROR(ENOTRECOVERABLE);
+ case CELT_ALLOC_FAIL: return AVERROR(ENOMEM);
+ default: return AVERROR_UNKNOWN;
+ }
+}
+
+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"),
+};
More information about the ffmpeg-cvslog
mailing list