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85 lines
2.6 KiB
85 lines
2.6 KiB
11 years ago
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/*
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* Packed Animation File audio decoder
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* Copyright (c) 2012 Paul B Mahol
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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/intreadwrite.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "mathops.h"
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#define PAF_SOUND_SAMPLES 2205
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#define PAF_SOUND_FRAME_SIZE ((256 + PAF_SOUND_SAMPLES) * 2)
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static av_cold int paf_audio_init(AVCodecContext *avctx)
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{
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if (avctx->channels != 2) {
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av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
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return AVERROR_INVALIDDATA;
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}
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avctx->channel_layout = AV_CH_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 paf_audio_decode(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *pkt)
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{
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AVFrame *frame = data;
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int16_t *output_samples;
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const uint8_t *src = pkt->data;
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int frames, ret, i, j;
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int16_t cb[256];
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frames = pkt->size / PAF_SOUND_FRAME_SIZE;
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if (frames < 1)
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return AVERROR_INVALIDDATA;
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frame->nb_samples = PAF_SOUND_SAMPLES * frames;
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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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// codebook of 256 16-bit samples and 8-bit indices to it
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for (j = 0; j < frames; j++) {
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for (i = 0; i < 256; i++)
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cb[i] = sign_extend(AV_RL16(src + i * 2), 16);
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src += 256 * 2;
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// always 2 channels
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for (i = 0; i < PAF_SOUND_SAMPLES * 2; i++)
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*output_samples++ = cb[*src++];
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}
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*got_frame = 1;
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return pkt->size;
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}
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AVCodec ff_paf_audio_decoder = {
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.name = "paf_audio",
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.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_PAF_AUDIO,
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.init = paf_audio_init,
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.decode = paf_audio_decode,
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.capabilities = CODEC_CAP_DR1,
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};
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