[FFmpeg-devel] [PATCH 2/3] lavc: Opus decoder using libopus.
Nicolas George
nicolas.george at normalesup.org
Wed Jul 4 16:43:49 CEST 2012
Signed-off-by: Nicolas George <nicolas.george at normalesup.org>
---
configure | 5 ++
libavcodec/Makefile | 1 +
libavcodec/allcodecs.c | 1 +
libavcodec/libopus_dec.c | 166 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 173 insertions(+)
create mode 100644 libavcodec/libopus_dec.c
Changes since previous version:
Fixed .long_name.
Only 48000 Hz, it seems that the subsamples rates are moderately supported.
Expect the whole OpusHead packet in extradata.
diff --git a/configure b/configure
index aac7795..9a090a1 100755
--- a/configure
+++ b/configure
@@ -189,6 +189,7 @@ External library support:
--enable-libopencore-amrwb enable AMR-WB decoding via libopencore-amrwb [no]
--enable-libopencv enable video filtering via libopencv [no]
--enable-libopenjpeg enable JPEG 2000 encoding/decoding via OpenJPEG [no]
+ --enable-libopus enable Opus decoding via libopus [no]
--enable-libpulse enable Pulseaudio input via libpulse [no]
--enable-librtmp enable RTMP[E] support via librtmp [no]
--enable-libschroedinger enable Dirac support via libschroedinger [no]
@@ -1063,6 +1064,7 @@ CONFIG_LIST="
libopencore_amrwb
libopencv
libopenjpeg
+ libopus
libpulse
librtmp
libschroedinger
@@ -1618,6 +1620,7 @@ libopencore_amrnb_encoder_deps="libopencore_amrnb"
libopencore_amrwb_decoder_deps="libopencore_amrwb"
libopenjpeg_decoder_deps="libopenjpeg"
libopenjpeg_encoder_deps="libopenjpeg"
+libopus_decoder_deps="libopus"
libschroedinger_decoder_deps="libschroedinger"
libschroedinger_encoder_deps="libschroedinger"
libspeex_decoder_deps="libspeex"
@@ -3302,6 +3305,7 @@ enabled libopencore_amrnb && require libopencore_amrnb opencore-amrnb/interf_de
enabled libopencore_amrwb && require libopencore_amrwb opencore-amrwb/dec_if.h D_IF_init -lopencore-amrwb
enabled libopencv && require_pkg_config opencv opencv/cxcore.h cvCreateImageHeader
enabled libopenjpeg && require libopenjpeg openjpeg.h opj_version -lopenjpeg
+enabled libopus && require_pkg_config opus opus_multistream.h opus_multistream_decoder_create
enabled libpulse && require_pkg_config libpulse-simple pulse/simple.h pa_simple_new
enabled librtmp && require_pkg_config librtmp librtmp/rtmp.h RTMP_Socket
enabled libschroedinger && require_pkg_config schroedinger-1.0 schroedinger/schro.h schro_init
@@ -3677,6 +3681,7 @@ echo "libopencore-amrnb support ${libopencore_amrnb-no}"
echo "libopencore-amrwb support ${libopencore_amrwb-no}"
echo "libopencv support ${libopencv-no}"
echo "libopenjpeg enabled ${libopenjpeg-no}"
+echo "libopus enabled ${libopus-no}"
echo "libpulse enabled ${libpulse-no}"
echo "librtmp enabled ${librtmp-no}"
echo "libschroedinger enabled ${libschroedinger-no}"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index a3891c2..2f5ddb5 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -676,6 +676,7 @@ OBJS-$(CONFIG_LIBOPENCORE_AMRNB_ENCODER) += libopencore-amr.o \
OBJS-$(CONFIG_LIBOPENCORE_AMRWB_DECODER) += libopencore-amr.o
OBJS-$(CONFIG_LIBOPENJPEG_DECODER) += libopenjpegdec.o
OBJS-$(CONFIG_LIBOPENJPEG_ENCODER) += libopenjpegenc.o
+OBJS-$(CONFIG_LIBOPUS_DECODER) += libopus_dec.o
OBJS-$(CONFIG_LIBSCHROEDINGER_DECODER) += libschroedingerdec.o \
libschroedinger.o
OBJS-$(CONFIG_LIBSCHROEDINGER_ENCODER) += libschroedingerenc.o \
diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
index e7c1103..b7d8974 100644
--- a/libavcodec/allcodecs.c
+++ b/libavcodec/allcodecs.c
@@ -421,6 +421,7 @@ void avcodec_register_all(void)
REGISTER_ENCDEC (LIBOPENCORE_AMRNB, libopencore_amrnb);
REGISTER_DECODER (LIBOPENCORE_AMRWB, libopencore_amrwb);
REGISTER_ENCDEC (LIBOPENJPEG, libopenjpeg);
+ REGISTER_DECODER (LIBOPUS, libopus);
REGISTER_ENCDEC (LIBSCHROEDINGER, libschroedinger);
REGISTER_ENCDEC (LIBSPEEX, libspeex);
REGISTER_DECODER (LIBSTAGEFRIGHT_H264, libstagefright_h264);
diff --git a/libavcodec/libopus_dec.c b/libavcodec/libopus_dec.c
new file mode 100644
index 0000000..6de4c70
--- /dev/null
+++ b/libavcodec/libopus_dec.c
@@ -0,0 +1,166 @@
+/*
+ * Opus decoder using libopus
+ * Copyright (c) 2012 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 <opus.h>
+#include <opus_multistream.h>
+#include "avcodec.h"
+#include "vorbis.h"
+#include "libavutil/intreadwrite.h"
+
+struct libopus_context {
+ OpusMSDecoder *dec;
+ AVFrame frame;
+};
+
+static int ff_opus_error_to_averror(int err)
+{
+ switch (err) {
+ case OPUS_BAD_ARG: return AVERROR(EINVAL);
+ case OPUS_BUFFER_TOO_SMALL: return AVERROR_BUFFER_TOO_SMALL;
+ case OPUS_INTERNAL_ERROR: return AVERROR(EFAULT);
+ case OPUS_INVALID_PACKET: return AVERROR_INVALIDDATA;
+ case OPUS_UNIMPLEMENTED: return AVERROR(ENOSYS);
+ case OPUS_INVALID_STATE: return AVERROR_EXTERNAL;
+ case OPUS_ALLOC_FAIL: return AVERROR(ENOMEM);
+ default: return AVERROR(EINVAL);
+ }
+}
+
+static inline void reorder(uint8_t *data, unsigned channels, unsigned bps,
+ unsigned samples, const uint8_t *map)
+{
+ uint8_t tmp[8 * 4];
+ unsigned i;
+
+ for (; samples > 0; samples--) {
+ for (i = 0; i < channels; i++)
+ memcpy(tmp + bps * i, data + bps * map[i], bps);
+ memcpy(data, tmp, bps * channels);
+ data += bps * channels;
+ }
+}
+
+#define OPUS_HEAD_SIZE 19
+
+static av_cold int libopus_dec_init(AVCodecContext *avc)
+{
+ struct libopus_context *opus = avc->priv_data;
+ int err, rate_idx;
+ int nb_streams, nb_coupled;
+ uint8_t mapping_stereo[] = { 0, 1 }, *mapping;
+
+ avc->sample_rate = 48000;
+ avc->sample_fmt = avc->request_sample_fmt == AV_SAMPLE_FMT_FLT ?
+ AV_SAMPLE_FMT_FLT : AV_SAMPLE_FMT_S16;
+ avc->channel_layout = avc->channels > 8 ? 0 :
+ ff_vorbis_channel_layouts[avc->channels - 1];
+
+ if (avc->extradata_size >= OPUS_HEAD_SIZE + 2 + avc->channels) {
+ nb_streams = avc->extradata[OPUS_HEAD_SIZE + 0];
+ nb_coupled = avc->extradata[OPUS_HEAD_SIZE + 1];
+ if (nb_streams + nb_coupled != avc->channels)
+ av_log(avc, AV_LOG_WARNING, "Inconsistent channel mapping.\n");
+ mapping = avc->extradata + OPUS_HEAD_SIZE + 2;
+ } else {
+ if (avc->channels > 2) {
+ av_log(avc, AV_LOG_ERROR,
+ "No channel mapping for %d channels.\n", avc->channels);
+ return AVERROR(EINVAL);
+ }
+ nb_streams = 1;
+ nb_coupled = avc->channels > 1;
+ mapping = mapping_stereo;
+ }
+
+ opus->dec = opus_multistream_decoder_create(
+ avc->sample_rate, avc->channels,
+ nb_streams, nb_coupled, mapping, &err);
+ if (!opus->dec) {
+ av_log(avc, AV_LOG_ERROR, "Unable to create decoder: %s\n",
+ opus_strerror(err));
+ return ff_opus_error_to_averror(err);
+ }
+ avcodec_get_frame_defaults(&opus->frame);
+ avc->coded_frame = &opus->frame;
+ return 0;
+}
+
+static av_cold int libopus_dec_close(AVCodecContext *avc)
+{
+ struct libopus_context *opus = avc->priv_data;
+
+ opus_multistream_decoder_destroy(opus->dec);
+ return 0;
+}
+
+#define MAX_FRAME_SIZE (960*6)
+
+static int libopus_dec_decode(AVCodecContext *avc, void *frame,
+ int *got_frame_ptr, AVPacket *pkt)
+{
+ struct libopus_context *opus = avc->priv_data;
+ int ret;
+
+ opus->frame.nb_samples = MAX_FRAME_SIZE;
+ ret = avc->get_buffer(avc, &opus->frame);
+ if (ret < 0) {
+ av_log(avc, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+
+ ret = avc->sample_fmt == AV_SAMPLE_FMT_S16 ?
+ opus_multistream_decode (opus->dec, pkt->data, pkt->size,
+ (void *)opus->frame.data[0],
+ opus->frame.nb_samples, 0) :
+ opus_multistream_decode_float(opus->dec, pkt->data, pkt->size,
+ (void *)opus->frame.data[0],
+ opus->frame.nb_samples, 0);
+ if (ret < 0) {
+ av_log(avc, AV_LOG_ERROR, "Decoding error: %s\n", opus_strerror(ret));
+ return ff_opus_error_to_averror(ret);
+ }
+
+ if (avc->channels > 3 && avc->channels <= 8) {
+ const uint8_t *m = ff_vorbis_channel_layout_offsets[avc->channels - 1];
+ if (avc->sample_fmt == AV_SAMPLE_FMT_S16)
+ reorder(opus->frame.data[0], avc->channels, 2, ret, m);
+ else
+ reorder(opus->frame.data[0], avc->channels, 4, ret, m);
+ }
+
+ /* TODO discard */
+ opus->frame.nb_samples = ret;
+ *(AVFrame *)frame = opus->frame;
+ *got_frame_ptr = 1;
+ return ret;
+}
+
+AVCodec ff_libopus_decoder = {
+ .name = "libopus",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = CODEC_ID_OPUS,
+ .priv_data_size = sizeof(struct libopus_context),
+ .init = libopus_dec_init,
+ .close = libopus_dec_close,
+ .decode = libopus_dec_decode,
+ .capabilities = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("libopus Opus"),
+};
--
1.7.10
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