mirror of
https://git.ffmpeg.org/ffmpeg.git
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233 lines
7.3 KiB
C
233 lines
7.3 KiB
C
/*
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* TTA (The Lossless True Audio) encoder
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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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#define BITSTREAM_WRITER_LE
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#include "ttadata.h"
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#include "avcodec.h"
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#include "put_bits.h"
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#include "internal.h"
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#include "libavutil/crc.h"
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typedef struct TTAEncContext {
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const AVCRC *crc_table;
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int bps;
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TTAChannel *ch_ctx;
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} TTAEncContext;
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static av_cold int tta_encode_init(AVCodecContext *avctx)
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{
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TTAEncContext *s = avctx->priv_data;
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s->crc_table = av_crc_get_table(AV_CRC_32_IEEE_LE);
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switch (avctx->sample_fmt) {
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case AV_SAMPLE_FMT_U8:
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avctx->bits_per_raw_sample = 8;
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break;
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case AV_SAMPLE_FMT_S16:
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avctx->bits_per_raw_sample = 16;
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break;
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case AV_SAMPLE_FMT_S32:
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if (avctx->bits_per_raw_sample > 24)
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av_log(avctx, AV_LOG_WARNING, "encoding as 24 bits-per-sample\n");
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avctx->bits_per_raw_sample = 24;
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}
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s->bps = avctx->bits_per_raw_sample >> 3;
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avctx->frame_size = 256 * avctx->sample_rate / 245;
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s->ch_ctx = av_malloc(avctx->channels * sizeof(*s->ch_ctx));
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if (!s->ch_ctx)
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return AVERROR(ENOMEM);
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return 0;
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}
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static inline void ttafilter_process(TTAFilter *c, int32_t *in)
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{
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register int32_t *dl = c->dl, *qm = c->qm, *dx = c->dx, sum = c->round;
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if (c->error < 0) {
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qm[0] -= dx[0]; qm[1] -= dx[1]; qm[2] -= dx[2]; qm[3] -= dx[3];
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qm[4] -= dx[4]; qm[5] -= dx[5]; qm[6] -= dx[6]; qm[7] -= dx[7];
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} else if (c->error > 0) {
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qm[0] += dx[0]; qm[1] += dx[1]; qm[2] += dx[2]; qm[3] += dx[3];
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qm[4] += dx[4]; qm[5] += dx[5]; qm[6] += dx[6]; qm[7] += dx[7];
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}
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sum += dl[0] * qm[0] + dl[1] * qm[1] + dl[2] * qm[2] + dl[3] * qm[3] +
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dl[4] * qm[4] + dl[5] * qm[5] + dl[6] * qm[6] + dl[7] * qm[7];
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dx[0] = dx[1]; dx[1] = dx[2]; dx[2] = dx[3]; dx[3] = dx[4];
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dl[0] = dl[1]; dl[1] = dl[2]; dl[2] = dl[3]; dl[3] = dl[4];
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dx[4] = ((dl[4] >> 30) | 1);
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dx[5] = ((dl[5] >> 30) | 2) & ~1;
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dx[6] = ((dl[6] >> 30) | 2) & ~1;
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dx[7] = ((dl[7] >> 30) | 4) & ~3;
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dl[4] = -dl[5]; dl[5] = -dl[6];
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dl[6] = *in - dl[7]; dl[7] = *in;
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dl[5] += dl[6]; dl[4] += dl[5];
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*in -= (sum >> c->shift);
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c->error = *in;
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}
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static int32_t get_sample(const AVFrame *frame, int sample,
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enum AVSampleFormat format)
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{
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int32_t ret;
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if (format == AV_SAMPLE_FMT_U8) {
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ret = frame->data[0][sample] - 0x80;
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} else if (format == AV_SAMPLE_FMT_S16) {
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const int16_t *ptr = (const int16_t *)frame->data[0];
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ret = ptr[sample];
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} else {
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const int32_t *ptr = (const int32_t *)frame->data[0];
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ret = ptr[sample] >> 8;
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}
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return ret;
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}
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static int tta_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr)
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{
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TTAEncContext *s = avctx->priv_data;
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PutBitContext pb;
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int ret, i, out_bytes, cur_chan = 0, res = 0, samples = 0;
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if ((ret = ff_alloc_packet2(avctx, avpkt, frame->nb_samples * 2 * avctx->channels * s->bps)) < 0)
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return ret;
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init_put_bits(&pb, avpkt->data, avpkt->size);
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// init per channel states
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for (i = 0; i < avctx->channels; i++) {
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s->ch_ctx[i].predictor = 0;
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ff_tta_filter_init(&s->ch_ctx[i].filter, ff_tta_filter_configs[s->bps - 1]);
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ff_tta_rice_init(&s->ch_ctx[i].rice, 10, 10);
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}
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for (i = 0; i < frame->nb_samples * avctx->channels; i++) {
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TTAChannel *c = &s->ch_ctx[cur_chan];
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TTAFilter *filter = &c->filter;
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TTARice *rice = &c->rice;
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uint32_t k, unary, outval;
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int32_t value, temp;
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value = get_sample(frame, samples++, avctx->sample_fmt);
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if (avctx->channels > 1) {
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if (cur_chan < avctx->channels - 1)
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value = res = get_sample(frame, samples, avctx->sample_fmt) - value;
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else
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value -= res / 2;
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}
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temp = value;
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#define PRED(x, k) (int32_t)((((uint64_t)x << k) - x) >> k)
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switch (s->bps) {
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case 1: value -= PRED(c->predictor, 4); break;
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case 2:
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case 3: value -= PRED(c->predictor, 5); break;
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}
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c->predictor = temp;
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ttafilter_process(filter, &value);
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outval = (value > 0) ? (value << 1) - 1: -value << 1;
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k = rice->k0;
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rice->sum0 += outval - (rice->sum0 >> 4);
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if (rice->k0 > 0 && rice->sum0 < ff_tta_shift_16[rice->k0])
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rice->k0--;
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else if (rice->sum0 > ff_tta_shift_16[rice->k0 + 1])
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rice->k0++;
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if (outval >= ff_tta_shift_1[k]) {
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outval -= ff_tta_shift_1[k];
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k = rice->k1;
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rice->sum1 += outval - (rice->sum1 >> 4);
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if (rice->k1 > 0 && rice->sum1 < ff_tta_shift_16[rice->k1])
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rice->k1--;
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else if (rice->sum1 > ff_tta_shift_16[rice->k1 + 1])
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rice->k1++;
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unary = 1 + (outval >> k);
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do {
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if (unary > 31) {
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put_bits(&pb, 31, 0x7FFFFFFF);
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unary -= 31;
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} else {
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put_bits(&pb, unary, (1 << unary) - 1);
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unary = 0;
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}
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} while (unary);
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}
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put_bits(&pb, 1, 0);
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if (k)
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put_bits(&pb, k, outval & (ff_tta_shift_1[k] - 1));
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if (cur_chan < avctx->channels - 1)
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cur_chan++;
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else
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cur_chan = 0;
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}
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flush_put_bits(&pb);
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out_bytes = put_bits_count(&pb) >> 3;
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put_bits32(&pb, av_crc(s->crc_table, UINT32_MAX, avpkt->data, out_bytes) ^ UINT32_MAX);
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flush_put_bits(&pb);
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avpkt->pts = frame->pts;
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avpkt->size = out_bytes + 4;
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avpkt->duration = ff_samples_to_time_base(avctx, frame->nb_samples);
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*got_packet_ptr = 1;
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return 0;
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}
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static av_cold int tta_encode_close(AVCodecContext *avctx)
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{
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TTAEncContext *s = avctx->priv_data;
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av_freep(&s->ch_ctx);
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return 0;
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}
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AVCodec ff_tta_encoder = {
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.name = "tta",
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.long_name = NULL_IF_CONFIG_SMALL("TTA (True Audio)"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_TTA,
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.priv_data_size = sizeof(TTAEncContext),
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.init = tta_encode_init,
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.close = tta_encode_close,
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.encode2 = tta_encode_frame,
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.capabilities = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_LOSSLESS,
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.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_U8,
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AV_SAMPLE_FMT_S16,
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AV_SAMPLE_FMT_S32,
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AV_SAMPLE_FMT_NONE },
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};
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