diff options
Diffstat (limited to 'media/ffvpx/libavcodec/libopusdec.c')
| -rw-r--r-- | media/ffvpx/libavcodec/libopusdec.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/libopusdec.c b/media/ffvpx/libavcodec/libopusdec.c new file mode 100644 index 0000000000..9b9a610343 --- /dev/null +++ b/media/ffvpx/libavcodec/libopusdec.c @@ -0,0 +1,252 @@ +/* + * 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", +}; |