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20f9727018
Up until now, codec.h contains both public and private parts of AVCodec. This exposes the internals of AVCodec to users and leads them into the temptation of actually using them and forces us to forward-declare structures and types that users can't use at all. This commit changes this by adding a new structure FFCodec to codec_internal.h that extends AVCodec, i.e. contains the public AVCodec as first member; the private fields of AVCodec are moved to this structure, leaving codec.h clean. Reviewed-by: Anton Khirnov <anton@khirnov.net> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
92 lines
3.0 KiB
C
92 lines
3.0 KiB
C
/*
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* Discworld II BMV audio decoder
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* Copyright (c) 2011 Konstantin Shishkov
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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 "libavutil/common.h"
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#include "avcodec.h"
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#include "codec_internal.h"
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#include "internal.h"
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static const int bmv_aud_mults[16] = {
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16512, 8256, 4128, 2064, 1032, 516, 258, 192, 129, 88, 64, 56, 48, 40, 36, 32
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};
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static av_cold int bmv_aud_decode_init(AVCodecContext *avctx)
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{
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av_channel_layout_uninit(&avctx->ch_layout);
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avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
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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 int bmv_aud_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame_ptr, AVPacket *avpkt)
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{
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AVFrame *frame = data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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int blocks = 0, total_blocks, i;
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int ret;
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int16_t *output_samples;
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int scale[2];
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total_blocks = *buf++;
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if (buf_size < total_blocks * 65 + 1) {
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av_log(avctx, AV_LOG_ERROR, "expected %d bytes, got %d\n",
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total_blocks * 65 + 1, buf_size);
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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 = total_blocks * 32;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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output_samples = (int16_t *)frame->data[0];
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for (blocks = 0; blocks < total_blocks; blocks++) {
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uint8_t code = *buf++;
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code = (code >> 1) | (code << 7);
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scale[0] = bmv_aud_mults[code & 0xF];
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scale[1] = bmv_aud_mults[code >> 4];
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for (i = 0; i < 32; i++) {
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*output_samples++ = av_clip_int16((scale[0] * (int8_t)*buf++) >> 5);
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*output_samples++ = av_clip_int16((scale[1] * (int8_t)*buf++) >> 5);
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}
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}
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*got_frame_ptr = 1;
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return buf_size;
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}
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const FFCodec ff_bmv_audio_decoder = {
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.p.name = "bmv_audio",
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.p.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV audio"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.id = AV_CODEC_ID_BMV_AUDIO,
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.init = bmv_aud_decode_init,
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.decode = bmv_aud_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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