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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 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/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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#include "paf.h" |
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static av_cold int paf_audio_init(AVCodecContext *avctx) |
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{ |
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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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✗✓ |
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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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✗✓ |
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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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✓✓ |
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for (j = 0; j < frames; j++) { |
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✓✓ |
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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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✓✓ |
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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 = AV_CODEC_CAP_DR1, |
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}; |