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avcodec: add MI-SC4 audio decoder
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@ -12,6 +12,7 @@ version <next>:
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- WBMP (Wireless Application Protocol Bitmap) image format
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- a3dscope filter
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- bonk decoder and demuxer
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- Micronas SC-4 audio decoder
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version 5.1:
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@ -1256,6 +1256,7 @@ following image formats are supported:
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@item Interplay ACM @tab @tab X
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@item MACE (Macintosh Audio Compression/Expansion) 3:1 @tab @tab X
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@item MACE (Macintosh Audio Compression/Expansion) 6:1 @tab @tab X
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@item MI-SC4 (Micronas SC-4 Audio) @tab @tab X
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@item MLP (Meridian Lossless Packing) @tab X @tab X
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@tab Used in DVD-Audio discs.
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@item Monkey's Audio @tab @tab X
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@ -471,6 +471,7 @@ OBJS-$(CONFIG_METASOUND_DECODER) += metasound.o metasound_data.o \
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twinvq.o
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OBJS-$(CONFIG_MICRODVD_DECODER) += microdvddec.o ass.o
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OBJS-$(CONFIG_MIMIC_DECODER) += mimic.o
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OBJS-$(CONFIG_MISC4_DECODER) += misc4.o
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OBJS-$(CONFIG_MJPEG_DECODER) += mjpegdec.o mjpegdec_common.o
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OBJS-$(CONFIG_MJPEG_QSV_DECODER) += qsvdec.o
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OBJS-$(CONFIG_MJPEG_ENCODER) += mjpegenc.o mjpegenc_common.o \
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@ -483,6 +483,7 @@ extern const FFCodec ff_interplay_acm_decoder;
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extern const FFCodec ff_mace3_decoder;
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extern const FFCodec ff_mace6_decoder;
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extern const FFCodec ff_metasound_decoder;
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extern const FFCodec ff_misc4_decoder;
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extern const FFCodec ff_mlp_encoder;
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extern const FFCodec ff_mlp_decoder;
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extern const FFCodec ff_mp1_decoder;
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@ -3297,6 +3297,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
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.long_name = NULL_IF_CONFIG_SMALL("Bonk audio"),
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.props = AV_CODEC_PROP_LOSSY | AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
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},
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{
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.id = AV_CODEC_ID_MISC4,
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.type = AVMEDIA_TYPE_AUDIO,
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.name = "misc4",
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.long_name = NULL_IF_CONFIG_SMALL("Micronas SC-4 Audio"),
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.props = AV_CODEC_PROP_LOSSY | AV_CODEC_PROP_INTRA_ONLY,
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},
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/* subtitle codecs */
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{
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@ -528,6 +528,7 @@ enum AVCodecID {
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AV_CODEC_ID_MSNSIREN,
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AV_CODEC_ID_DFPWM,
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AV_CODEC_ID_BONK,
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AV_CODEC_ID_MISC4,
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/* subtitle codecs */
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AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, ///< A dummy ID pointing at the start of subtitle codecs.
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186
libavcodec/misc4.c
Normal file
186
libavcodec/misc4.c
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@ -0,0 +1,186 @@
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/*
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* Micronas SC-4 audio decoder
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* Copyright (c) 2022 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "decode.h"
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#include "bytestream.h"
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#include "mathops.h"
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static const int16_t steps[16] = {
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4084, 18, 41, 64, 112, 198, 355, 1122,
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1122, 355, 198, 112, 64, 41, 18, 4084,
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};
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static const int16_t diffs[16] = {
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2048, 4, 135, 213, 273, 323, 373, 425,
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425, 373, 323, 273, 213, 135, 4, 2048,
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};
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typedef struct ChannelContext {
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unsigned last_step;
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int64_t new_pred;
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int64_t pred;
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int64_t weights_tab[6];
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int32_t diffs_tab[6];
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} ChannelContext;
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typedef struct MISC4Context {
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GetByteContext gb;
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uint32_t marker;
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ChannelContext ch[2];
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} MISC4Context;
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static av_cold int misc4_init(AVCodecContext *avctx)
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{
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MISC4Context *s = avctx->priv_data;
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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switch (avctx->sample_rate) {
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case 8000:
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case 11025:
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s->marker = 0x11b;
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break;
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case 16000:
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case 32000:
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s->marker = 0x2b2;
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break;
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}
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return 0;
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}
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#define FRACBITS 12
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#define WEIGHTSBITS 26
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static int64_t prediction(int delta, ChannelContext *c)
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{
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const int isign = FFDIFFSIGN(delta, 0);
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int64_t dotpr = 0;
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c->new_pred = delta * (1LL << FRACBITS) + c->pred;
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for (int i = 0; i < 6; i++) {
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const int sign = FFSIGN(c->diffs_tab[i]);
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c->weights_tab[i] = (c->weights_tab[i] * 255LL) / 256;
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c->weights_tab[i] += (1LL << (WEIGHTSBITS + 1)) * sign * isign;
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}
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memmove(&c->diffs_tab[1], &c->diffs_tab[0], 5 * sizeof(int32_t));
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c->diffs_tab[0] = -delta * (1 << (FRACBITS-8));
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c->pred = c->new_pred;
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dotpr = 0;
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for (int i = 0; i < 6; i++)
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dotpr += ((int64_t)c->diffs_tab[i] * c->weights_tab[i]) >> WEIGHTSBITS;
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c->pred += dotpr;
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c->pred = av_clip64(c->pred, -16383 * (1 << FRACBITS), 16383 * (1 << FRACBITS));
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c->pred = c->pred * 9 / 10;
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return c->new_pred;
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}
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static int16_t decode(ChannelContext *c, unsigned nibble)
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{
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int diff, diff_sign, adiff = 0, delta;
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uint32_t step, newstep;
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int64_t pred;
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diff_sign = nibble >> 3;
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diff = diffs[nibble];
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step = diff + (c->last_step >> 2);
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newstep = step & 0xfff;
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if (newstep >> 11 == 0)
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adiff = (((step & 0x7f) + 0x80) * 128) >>
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(14 - (newstep >> 7));
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delta = diff_sign ? -adiff : adiff;
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delta = av_clip_intp2(delta, 15);
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pred = prediction(delta, c);
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nibble = steps[nibble];
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newstep = nibble * 32 - c->last_step & 0x1ffff;
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newstep = ((newstep >> 5) + (newstep & 0x10000 ? 0x1000 : 0) + c->last_step) & 0x1fff;
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c->last_step = av_clip(newstep, 544, 5120);
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return av_clip_int16(pred >> (FRACBITS - 3));
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}
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static int misc4_decode(AVCodecContext *avctx, AVFrame *frame,
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int *got_frame_ptr, AVPacket *pkt)
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{
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MISC4Context *s = avctx->priv_data;
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GetByteContext *gb = &s->gb;
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uint32_t hdr;
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int ret;
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bytestream2_init(gb, pkt->data, pkt->size);
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frame->nb_samples = 29 * (1 + (avctx->ch_layout.nb_channels == 1));
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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hdr = bytestream2_peek_be32(gb);
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if (hdr == s->marker) {
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bytestream2_skip(gb, 5);
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} else if ((hdr >> 16) == s->marker) {
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bytestream2_skip(gb, 3);
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}
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{
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int16_t *samples = (int16_t *)frame->data[0];
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const int st = avctx->ch_layout.nb_channels == 2;
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int n;
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for (n = 0; n < 29; n++) {
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int nibble = bytestream2_get_byte(gb);
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samples[2*n+0] = decode(&s->ch[0 ], nibble >> 4);
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samples[2*n+1] = decode(&s->ch[st], nibble & 15);
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if (bytestream2_get_bytes_left(gb) <= 0)
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break;
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}
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if (n == 29 && bytestream2_get_byte(gb) != 0x55)
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return AVERROR_INVALIDDATA;
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}
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*got_frame_ptr = 1;
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return bytestream2_tell(gb);
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}
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const FFCodec ff_misc4_decoder = {
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.p.name = "misc4",
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CODEC_LONG_NAME("Micronas SC-4 Audio"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.id = AV_CODEC_ID_MISC4,
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.priv_data_size = sizeof(MISC4Context),
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.init = misc4_init,
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FF_CODEC_DECODE_CB(misc4_decode),
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_SUBFRAMES |
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AV_CODEC_CAP_CHANNEL_CONF,
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.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
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AV_SAMPLE_FMT_NONE },
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};
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#include "version_major.h"
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#define LIBAVCODEC_VERSION_MINOR 43
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#define LIBAVCODEC_VERSION_MINOR 44
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#define LIBAVCODEC_VERSION_MICRO 100
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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@ -564,6 +564,7 @@ const AVCodecTag ff_codec_wav_tags[] = {
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{ AV_CODEC_ID_ATRAC3, 0x0270 },
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{ AV_CODEC_ID_MSNSIREN, 0x028E },
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{ AV_CODEC_ID_ADPCM_G722, 0x028F },
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{ AV_CODEC_ID_MISC4, 0x0350 },
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{ AV_CODEC_ID_IMC, 0x0401 },
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{ AV_CODEC_ID_IAC, 0x0402 },
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{ AV_CODEC_ID_ON2AVC, 0x0500 },
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