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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>
86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/*
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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/channel_layout.h"
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#include "libavutil/intreadwrite.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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#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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if (avctx->ch_layout.nb_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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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 paf_audio_decode(AVCodecContext *avctx, AVFrame *frame,
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int *got_frame, AVPacket *pkt)
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{
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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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const FFCodec ff_paf_audio_decoder = {
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.p.name = "paf_audio",
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.p.long_name = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Audio"),
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.p.type = AVMEDIA_TYPE_AUDIO,
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.p.id = AV_CODEC_ID_PAF_AUDIO,
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.init = paf_audio_init,
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FF_CODEC_DECODE_CB(paf_audio_decode),
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.p.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
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};
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