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This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
140 lines
4.7 KiB
C
140 lines
4.7 KiB
C
/*
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* Real Audio 1.0 (14.4K)
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*
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* Copyright (c) 2008 Vitor Sessak
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* Copyright (c) 2003 Nick Kurshev
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* Based on public domain decoder at http://www.honeypot.net/audio
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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/channel_layout.h"
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "ra144.h"
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static av_cold int ra144_decode_init(AVCodecContext * avctx)
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{
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RA144Context *ractx = avctx->priv_data;
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ractx->avctx = avctx;
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ff_audiodsp_init(&ractx->adsp);
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ractx->lpc_coef[0] = ractx->lpc_tables[0];
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ractx->lpc_coef[1] = ractx->lpc_tables[1];
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av_channel_layout_uninit(&avctx->ch_layout);
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avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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return 0;
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}
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static void do_output_subblock(RA144Context *ractx, const int16_t *lpc_coefs,
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int gval, GetBitContext *gb)
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{
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int cba_idx = get_bits(gb, 7); // index of the adaptive CB, 0 if none
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int gain = get_bits(gb, 8);
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int cb1_idx = get_bits(gb, 7);
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int cb2_idx = get_bits(gb, 7);
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ff_subblock_synthesis(ractx, lpc_coefs, cba_idx, cb1_idx, cb2_idx, gval,
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gain);
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}
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/** Uncompress one block (20 bytes -> 160*2 bytes). */
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static int ra144_decode_frame(AVCodecContext * avctx, AVFrame *frame,
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int *got_frame_ptr, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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static const uint8_t sizes[LPC_ORDER] = {6, 5, 5, 4, 4, 3, 3, 3, 3, 2};
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unsigned int refl_rms[NBLOCKS]; // RMS of the reflection coefficients
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int16_t block_coefs[NBLOCKS][LPC_ORDER]; // LPC coefficients of each sub-block
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unsigned int lpc_refl[LPC_ORDER]; // LPC reflection coefficients of the frame
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int i, j;
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int ret;
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int16_t *samples;
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unsigned int energy;
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RA144Context *ractx = avctx->priv_data;
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GetBitContext gb;
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if (buf_size < FRAME_SIZE) {
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av_log(avctx, AV_LOG_ERROR,
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"Frame too small (%d bytes). Truncated file?\n", buf_size);
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*got_frame_ptr = 0;
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return AVERROR_INVALIDDATA;
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}
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/* get output buffer */
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frame->nb_samples = NBLOCKS * BLOCKSIZE;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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samples = (int16_t *)frame->data[0];
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init_get_bits8(&gb, buf, FRAME_SIZE);
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for (i = 0; i < LPC_ORDER; i++)
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lpc_refl[i] = ff_lpc_refl_cb[i][get_bits(&gb, sizes[i])];
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ff_eval_coefs(ractx->lpc_coef[0], lpc_refl);
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ractx->lpc_refl_rms[0] = ff_rms(lpc_refl);
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energy = ff_energy_tab[get_bits(&gb, 5)];
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refl_rms[0] = ff_interp(ractx, block_coefs[0], 1, 1, ractx->old_energy);
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refl_rms[1] = ff_interp(ractx, block_coefs[1], 2,
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energy <= ractx->old_energy,
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ff_t_sqrt(energy*ractx->old_energy) >> 12);
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refl_rms[2] = ff_interp(ractx, block_coefs[2], 3, 0, energy);
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refl_rms[3] = ff_rescale_rms(ractx->lpc_refl_rms[0], energy);
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ff_int_to_int16(block_coefs[3], ractx->lpc_coef[0]);
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for (i=0; i < NBLOCKS; i++) {
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do_output_subblock(ractx, block_coefs[i], refl_rms[i], &gb);
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for (j=0; j < BLOCKSIZE; j++)
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*samples++ = av_clip_int16(ractx->curr_sblock[j + 10] * (1 << 2));
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}
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ractx->old_energy = energy;
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ractx->lpc_refl_rms[1] = ractx->lpc_refl_rms[0];
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FFSWAP(unsigned int *, ractx->lpc_coef[0], ractx->lpc_coef[1]);
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*got_frame_ptr = 1;
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return FRAME_SIZE;
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}
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const FFCodec ff_ra_144_decoder = {
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.p.name = "real_144",
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.p.long_name = NULL_IF_CONFIG_SMALL("RealAudio 1.0 (14.4K)"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.id = AV_CODEC_ID_RA_144,
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.priv_data_size = sizeof(RA144Context),
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.init = ra144_decode_init,
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FF_CODEC_DECODE_CB(ra144_decode_frame),
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.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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