diff options
Diffstat (limited to 'libavcodec/libopusdec.c')
| -rw-r--r-- | libavcodec/libopusdec.c | 45 |
1 files changed, 40 insertions, 5 deletions
diff --git a/libavcodec/libopusdec.c b/libavcodec/libopusdec.c index 1b5b746496..f3cad25f76 100644 --- a/libavcodec/libopusdec.c +++ b/libavcodec/libopusdec.c @@ -2,20 +2,20 @@ * Opus decoder using libopus * Copyright (c) 2012 Nicolas George * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -25,6 +25,7 @@ #include "libavutil/avassert.h" #include "libavutil/intreadwrite.h" #include "avcodec.h" +#include "internal.h" #include "vorbis.h" #include "mathops.h" #include "libopus.h" @@ -32,6 +33,10 @@ struct libopus_context { OpusMSDecoder *dec; AVFrame frame; + int pre_skip; +#ifndef OPUS_SET_GAIN + union { int i; double d; } gain; +#endif }; #define OPUS_HEAD_SIZE 19 @@ -49,6 +54,7 @@ static av_cold int libopus_decode_init(AVCodecContext *avc) ff_vorbis_channel_layouts[avc->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); } @@ -73,7 +79,7 @@ static av_cold int libopus_decode_init(AVCodecContext *avc) const uint8_t *vorbis_offset = ff_vorbis_channel_layout_offsets[avc->channels - 1]; int ch; - /* Remap channels from vorbis order to libav order */ + /* Remap channels from vorbis order to ffmpeg order */ for (ch = 0; ch < avc->channels; ch++) mapping_arr[ch] = mapping[vorbis_offset[ch]]; mapping = mapping_arr; @@ -88,11 +94,22 @@ static av_cold int libopus_decode_init(AVCodecContext *avc) 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 = pow(10, 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 + avc->internal->skip_samples = opus->pre_skip; avc->delay = 3840; /* Decoder delay (in samples) at 48kHz */ avcodec_get_frame_defaults(&opus->frame); avc->coded_frame = &opus->frame; @@ -137,6 +154,21 @@ static int libopus_decode(AVCodecContext *avc, void *frame, return ff_opus_error_to_averror(nb_samples); } +#ifndef OPUS_SET_GAIN + { + int i = avc->channels * nb_samples; + if (avc->sample_fmt == AV_SAMPLE_FMT_FLT) { + float *pcm = (float *)opus->frame.data[0]; + for (; i > 0; i--, pcm++) + *pcm = av_clipf(*pcm * opus->gain.d, -1, 1); + } else { + int16_t *pcm = (int16_t *)opus->frame.data[0]; + for (; i > 0; i--, pcm++) + *pcm = av_clip_int16(((int64_t)opus->gain.i * *pcm) >> 16); + } + } +#endif + opus->frame.nb_samples = nb_samples; *(AVFrame *)frame = opus->frame; *got_frame_ptr = 1; @@ -148,6 +180,9 @@ 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; } AVCodec ff_libopus_decoder = { |