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-rw-r--r--media/ffvpx/libavcodec/libopusdec.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/libopusdec.c b/media/ffvpx/libavcodec/libopusdec.c
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index 0000000000..9b9a610343
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+++ b/media/ffvpx/libavcodec/libopusdec.c
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+/*
+ * 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 "libavutil/internal.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/ffmath.h"
+#include "libavutil/opt.h"
+
+#include "avcodec.h"
+#include "codec_internal.h"
+#include "decode.h"
+#include "internal.h"
+#include "mathops.h"
+#include "libopus.h"
+#include "vorbis_data.h"
+
+struct libopus_context {
+ AVClass *class;
+ OpusMSDecoder *dec;
+ int pre_skip;
+#ifndef OPUS_SET_GAIN
+ union { int i; double d; } gain;
+#endif
+#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST
+ int apply_phase_inv;
+#endif
+};
+
+#define OPUS_HEAD_SIZE 19
+
+static av_cold int libopus_decode_init(AVCodecContext *avc)
+{
+ struct libopus_context *opus = avc->priv_data;
+ int ret, channel_map = 0, gain_db = 0, nb_streams, nb_coupled, channels;
+ uint8_t mapping_arr[8] = { 0, 1 }, *mapping;
+
+ channels = avc->extradata_size >= 10 ? avc->extradata[9] : (avc->ch_layout.nb_channels == 1) ? 1 : 2;
+ if (channels <= 0) {
+ av_log(avc, AV_LOG_WARNING,
+ "Invalid number of channels %d, defaulting to stereo\n", channels);
+ channels = 2;
+ }
+
+ avc->sample_rate = 48000;
+ avc->sample_fmt = avc->request_sample_fmt == AV_SAMPLE_FMT_FLT ?
+ AV_SAMPLE_FMT_FLT : AV_SAMPLE_FMT_S16;
+ av_channel_layout_uninit(&avc->ch_layout);
+ if (channels > 8) {
+ avc->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
+ avc->ch_layout.nb_channels = channels;
+ } else {
+ av_channel_layout_copy(&avc->ch_layout, &ff_vorbis_ch_layouts[channels - 1]);
+ }
+
+ if (avc->extradata_size >= OPUS_HEAD_SIZE) {
+ opus->pre_skip = AV_RL16(avc->extradata + 10);
+ gain_db = sign_extend(AV_RL16(avc->extradata + 16), 16);
+ channel_map = AV_RL8 (avc->extradata + 18);
+ }
+ if (avc->extradata_size >= OPUS_HEAD_SIZE + 2 + channels) {
+ nb_streams = avc->extradata[OPUS_HEAD_SIZE + 0];
+ nb_coupled = avc->extradata[OPUS_HEAD_SIZE + 1];
+ if (nb_streams + nb_coupled != channels)
+ av_log(avc, AV_LOG_WARNING, "Inconsistent channel mapping.\n");
+ mapping = avc->extradata + OPUS_HEAD_SIZE + 2;
+ } else {
+ if (channels > 2 || channel_map) {
+ av_log(avc, AV_LOG_ERROR,
+ "No channel mapping for %d channels.\n", channels);
+ return AVERROR(EINVAL);
+ }
+ nb_streams = 1;
+ nb_coupled = channels > 1;
+ mapping = mapping_arr;
+ }
+
+ if (channels > 2 && channels <= 8) {
+ const uint8_t *vorbis_offset = ff_vorbis_channel_layout_offsets[channels - 1];
+ int ch;
+
+ /* Remap channels from Vorbis order to ffmpeg order */
+ for (ch = 0; ch < channels; ch++)
+ mapping_arr[ch] = mapping[vorbis_offset[ch]];
+ mapping = mapping_arr;
+ }
+
+ opus->dec = opus_multistream_decoder_create(avc->sample_rate, channels,
+ nb_streams, nb_coupled,
+ mapping, &ret);
+ if (!opus->dec) {
+ av_log(avc, AV_LOG_ERROR, "Unable to create decoder: %s\n",
+ opus_strerror(ret));
+ return ff_opus_error_to_averror(ret);
+ }
+
+#ifdef OPUS_SET_GAIN
+ ret = opus_multistream_decoder_ctl(opus->dec, OPUS_SET_GAIN(gain_db));
+ if (ret != OPUS_OK)
+ av_log(avc, AV_LOG_WARNING, "Failed to set gain: %s\n",
+ opus_strerror(ret));
+#else
+ {
+ double gain_lin = ff_exp10(gain_db / (20.0 * 256));
+ if (avc->sample_fmt == AV_SAMPLE_FMT_FLT)
+ opus->gain.d = gain_lin;
+ else
+ opus->gain.i = FFMIN(gain_lin * 65536, INT_MAX);
+ }
+#endif
+
+#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST
+ ret = opus_multistream_decoder_ctl(opus->dec,
+ OPUS_SET_PHASE_INVERSION_DISABLED(!opus->apply_phase_inv));
+ if (ret != OPUS_OK)
+ av_log(avc, AV_LOG_WARNING,
+ "Unable to set phase inversion: %s\n",
+ opus_strerror(ret));
+#endif
+
+ /* Decoder delay (in samples) at 48kHz */
+ avc->delay = avc->internal->skip_samples = opus->pre_skip;
+
+ return 0;
+}
+
+static av_cold int libopus_decode_close(AVCodecContext *avc)
+{
+ struct libopus_context *opus = avc->priv_data;
+
+ if (opus->dec) {
+ opus_multistream_decoder_destroy(opus->dec);
+ opus->dec = NULL;
+ }
+ return 0;
+}
+
+#define MAX_FRAME_SIZE (960 * 6)
+
+static int libopus_decode(AVCodecContext *avc, AVFrame *frame,
+ int *got_frame_ptr, AVPacket *pkt)
+{
+ struct libopus_context *opus = avc->priv_data;
+ int ret, nb_samples;
+
+ frame->nb_samples = MAX_FRAME_SIZE;
+ if ((ret = ff_get_buffer(avc, frame, 0)) < 0)
+ return ret;
+
+ if (avc->sample_fmt == AV_SAMPLE_FMT_S16)
+ nb_samples = opus_multistream_decode(opus->dec, pkt->data, pkt->size,
+ (opus_int16 *)frame->data[0],
+ frame->nb_samples, 0);
+ else
+ nb_samples = opus_multistream_decode_float(opus->dec, pkt->data, pkt->size,
+ (float *)frame->data[0],
+ frame->nb_samples, 0);
+
+ if (nb_samples < 0) {
+ av_log(avc, AV_LOG_ERROR, "Decoding error: %s\n",
+ opus_strerror(nb_samples));
+ return ff_opus_error_to_averror(nb_samples);
+ }
+
+#ifndef OPUS_SET_GAIN
+ {
+ int i = avc->ch_layout.nb_channels * nb_samples;
+ if (avc->sample_fmt == AV_SAMPLE_FMT_FLT) {
+ float *pcm = (float *)frame->data[0];
+ for (; i > 0; i--, pcm++)
+ *pcm = av_clipf(*pcm * opus->gain.d, -1, 1);
+ } else {
+ int16_t *pcm = (int16_t *)frame->data[0];
+ for (; i > 0; i--, pcm++)
+ *pcm = av_clip_int16(((int64_t)opus->gain.i * *pcm) >> 16);
+ }
+ }
+#endif
+
+ frame->nb_samples = nb_samples;
+ *got_frame_ptr = 1;
+
+ return pkt->size;
+}
+
+static void libopus_flush(AVCodecContext *avc)
+{
+ struct libopus_context *opus = avc->priv_data;
+
+ opus_multistream_decoder_ctl(opus->dec, OPUS_RESET_STATE);
+ /* The stream can have been extracted by a tool that is not Opus-aware.
+ Therefore, any packet can become the first of the stream. */
+ avc->internal->skip_samples = opus->pre_skip;
+}
+
+
+#define OFFSET(x) offsetof(struct libopus_context, x)
+#define FLAGS AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_DECODING_PARAM
+static const AVOption libopusdec_options[] = {
+#ifdef OPUS_SET_PHASE_INVERSION_DISABLED_REQUEST
+ { "apply_phase_inv", "Apply intensity stereo phase inversion", OFFSET(apply_phase_inv), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, FLAGS },
+#endif
+ { NULL },
+};
+
+static const AVClass libopusdec_class = {
+ .class_name = "libopusdec",
+ .item_name = av_default_item_name,
+ .option = libopusdec_options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+
+const FFCodec ff_libopus_decoder = {
+ .p.name = "libopus",
+ CODEC_LONG_NAME("libopus Opus"),
+ .p.type = AVMEDIA_TYPE_AUDIO,
+ .p.id = AV_CODEC_ID_OPUS,
+ .priv_data_size = sizeof(struct libopus_context),
+ .init = libopus_decode_init,
+ .close = libopus_decode_close,
+ FF_CODEC_DECODE_CB(libopus_decode),
+ .flush = libopus_flush,
+ .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
+ .caps_internal = FF_CODEC_CAP_NOT_INIT_THREADSAFE |
+ FF_CODEC_CAP_INIT_CLEANUP,
+ .p.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLT,
+ AV_SAMPLE_FMT_S16,
+ AV_SAMPLE_FMT_NONE },
+ .p.priv_class = &libopusdec_class,
+ .p.wrapper_name = "libopus",
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-22 07:59:30 +0000