1/* 2 * Packed Animation File audio decoder 3 * Copyright (c) 2012 Paul B Mahol 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavutil/channel_layout.h" 23#include "libavutil/intreadwrite.h" 24 25#include "avcodec.h" 26#include "codec_internal.h" 27#include "internal.h" 28#include "mathops.h" 29#include "paf.h" 30 31static av_cold int paf_audio_init(AVCodecContext *avctx) 32{ 33 if (avctx->ch_layout.nb_channels != 2) { 34 av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n"); 35 return AVERROR_INVALIDDATA; 36 } 37 38 av_channel_layout_uninit(&avctx->ch_layout); 39 avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO; 40 avctx->sample_fmt = AV_SAMPLE_FMT_S16; 41 42 return 0; 43} 44 45static int paf_audio_decode(AVCodecContext *avctx, AVFrame *frame, 46 int *got_frame, AVPacket *pkt) 47{ 48 int16_t *output_samples; 49 const uint8_t *src = pkt->data; 50 int frames, ret, i, j; 51 int16_t cb[256]; 52 53 frames = pkt->size / PAF_SOUND_FRAME_SIZE; 54 if (frames < 1) 55 return AVERROR_INVALIDDATA; 56 57 frame->nb_samples = PAF_SOUND_SAMPLES * frames; 58 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) 59 return ret; 60 61 output_samples = (int16_t *)frame->data[0]; 62 // codebook of 256 16-bit samples and 8-bit indices to it 63 for (j = 0; j < frames; j++) { 64 for (i = 0; i < 256; i++) 65 cb[i] = sign_extend(AV_RL16(src + i * 2), 16); 66 src += 256 * 2; 67 // always 2 channels 68 for (i = 0; i < PAF_SOUND_SAMPLES * 2; i++) 69 *output_samples++ = cb[*src++]; 70 } 71 *got_frame = 1; 72 73 return pkt->size; 74} 75 76const FFCodec ff_paf_audio_decoder = { 77 .p.name = "paf_audio", 78 .p.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"), 79 .p.type = AVMEDIA_TYPE_AUDIO, 80 .p.id = AV_CODEC_ID_PAF_AUDIO, 81 .init = paf_audio_init, 82 FF_CODEC_DECODE_CB(paf_audio_decode), 83 .p.capabilities = AV_CODEC_CAP_DR1, 84 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE, 85}; 86