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/* |
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* Copyright (C) 2008 Jaikrishnan Menon |
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* Copyright (C) 2011 Stefano Sabatini |
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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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/** |
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* @file |
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* 8svx audio decoder |
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* @author Jaikrishnan Menon |
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* |
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* supports: fibonacci delta encoding |
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* : exponential encoding |
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* |
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* For more information about the 8SVX format: |
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* http://netghost.narod.ru/gff/vendspec/iff/iff.txt |
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* http://sox.sourceforge.net/AudioFormats-11.html |
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* http://aminet.net/package/mus/misc/wavepak |
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* http://amigan.1emu.net/reg/8SVX.txt |
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* |
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* Samples can be found here: |
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* http://aminet.net/mods/smpl/ |
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*/ |
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#include "libavutil/avassert.h" |
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#include "avcodec.h" |
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#include "internal.h" |
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#include "libavutil/common.h" |
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/** decoder context */ |
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typedef struct EightSvxContext { |
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uint8_t fib_acc[2]; |
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const int8_t *table; |
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/* buffer used to store the whole first packet. |
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data is only sent as one large packet */ |
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uint8_t *data[2]; |
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int data_size; |
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int data_idx; |
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} EightSvxContext; |
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static const int8_t fibonacci[16] = { -34, -21, -13, -8, -5, -3, -2, -1, 0, 1, 2, 3, 5, 8, 13, 21 }; |
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static const int8_t exponential[16] = { -128, -64, -32, -16, -8, -4, -2, -1, 0, 1, 2, 4, 8, 16, 32, 64 }; |
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#define MAX_FRAME_SIZE 2048 |
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/** |
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* Delta decode the compressed values in src, and put the resulting |
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* decoded samples in dst. |
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* |
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* @param[in,out] state starting value. it is saved for use in the next call. |
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* @param table delta sequence table |
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*/ |
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static void delta_decode(uint8_t *dst, const uint8_t *src, int src_size, |
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uint8_t *state, const int8_t *table) |
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{ |
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uint8_t val = *state; |
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✓✓ |
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while (src_size--) { |
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uint8_t d = *src++; |
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val = av_clip_uint8(val + table[d & 0xF]); |
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*dst++ = val; |
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val = av_clip_uint8(val + table[d >> 4]); |
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*dst++ = val; |
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} |
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*state = val; |
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} |
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/** decode a frame */ |
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static int eightsvx_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame_ptr, AVPacket *avpkt) |
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{ |
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EightSvxContext *esc = avctx->priv_data; |
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AVFrame *frame = data; |
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int buf_size; |
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int ch, ret; |
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int hdr_size = 2; |
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/* decode and interleave the first packet */ |
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✓✓✓✗
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if (!esc->data[0] && avpkt) { |
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int chan_size = avpkt->size / avctx->channels - hdr_size; |
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✗✓ |
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if (avpkt->size % avctx->channels) { |
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av_log(avctx, AV_LOG_WARNING, "Packet with odd size, ignoring last byte\n"); |
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} |
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✗✓ |
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if (avpkt->size < (hdr_size + 1) * avctx->channels) { |
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av_log(avctx, AV_LOG_ERROR, "packet size is too small\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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esc->fib_acc[0] = avpkt->data[1] + 128; |
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if (avctx->channels == 2) |
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esc->fib_acc[1] = avpkt->data[2+chan_size+1] + 128; |
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esc->data_idx = 0; |
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esc->data_size = chan_size; |
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✗✓ |
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if (!(esc->data[0] = av_malloc(chan_size))) |
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return AVERROR(ENOMEM); |
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if (avctx->channels == 2) { |
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if (!(esc->data[1] = av_malloc(chan_size))) { |
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av_freep(&esc->data[0]); |
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return AVERROR(ENOMEM); |
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} |
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} |
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memcpy(esc->data[0], &avpkt->data[hdr_size], chan_size); |
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if (avctx->channels == 2) |
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memcpy(esc->data[1], &avpkt->data[2*hdr_size+chan_size], chan_size); |
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} |
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✗✓ |
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if (!esc->data[0]) { |
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av_log(avctx, AV_LOG_ERROR, "unexpected empty packet\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* decode next piece of data from the buffer */ |
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buf_size = FFMIN(MAX_FRAME_SIZE, esc->data_size - esc->data_idx); |
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if (buf_size <= 0) { |
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*got_frame_ptr = 0; |
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return avpkt->size; |
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} |
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/* get output buffer */ |
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frame->nb_samples = buf_size * 2; |
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
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return ret; |
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✓✓ |
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for (ch = 0; ch < avctx->channels; ch++) { |
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delta_decode(frame->data[ch], &esc->data[ch][esc->data_idx], |
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buf_size, &esc->fib_acc[ch], esc->table); |
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} |
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esc->data_idx += buf_size; |
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*got_frame_ptr = 1; |
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return ((avctx->frame_number == 0)*hdr_size + buf_size)*avctx->channels; |
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} |
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static av_cold int eightsvx_decode_init(AVCodecContext *avctx) |
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{ |
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EightSvxContext *esc = avctx->priv_data; |
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✓✗✗✓
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if (avctx->channels < 1 || avctx->channels > 2) { |
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av_log(avctx, AV_LOG_ERROR, "8SVX does not support more than 2 channels\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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✓✗✗ |
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switch (avctx->codec->id) { |
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case AV_CODEC_ID_8SVX_FIB: esc->table = fibonacci; break; |
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case AV_CODEC_ID_8SVX_EXP: esc->table = exponential; break; |
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default: |
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av_assert1(0); |
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} |
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avctx->sample_fmt = AV_SAMPLE_FMT_U8P; |
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return 0; |
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} |
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static av_cold int eightsvx_decode_close(AVCodecContext *avctx) |
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{ |
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EightSvxContext *esc = avctx->priv_data; |
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av_freep(&esc->data[0]); |
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av_freep(&esc->data[1]); |
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esc->data_size = 0; |
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esc->data_idx = 0; |
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return 0; |
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} |
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#if CONFIG_EIGHTSVX_FIB_DECODER |
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AVCodec ff_eightsvx_fib_decoder = { |
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.name = "8svx_fib", |
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.long_name = NULL_IF_CONFIG_SMALL("8SVX fibonacci"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_8SVX_FIB, |
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.priv_data_size = sizeof (EightSvxContext), |
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.init = eightsvx_decode_init, |
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.decode = eightsvx_decode_frame, |
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.close = eightsvx_decode_close, |
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.capabilities = AV_CODEC_CAP_DR1, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P, |
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AV_SAMPLE_FMT_NONE }, |
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}; |
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#endif |
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#if CONFIG_EIGHTSVX_EXP_DECODER |
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AVCodec ff_eightsvx_exp_decoder = { |
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.name = "8svx_exp", |
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.long_name = NULL_IF_CONFIG_SMALL("8SVX exponential"), |
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.type = AVMEDIA_TYPE_AUDIO, |
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.id = AV_CODEC_ID_8SVX_EXP, |
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.priv_data_size = sizeof (EightSvxContext), |
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.init = eightsvx_decode_init, |
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.decode = eightsvx_decode_frame, |
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.close = eightsvx_decode_close, |
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.capabilities = AV_CODEC_CAP_DR1, |
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.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_U8P, |
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AV_SAMPLE_FMT_NONE }, |
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}; |
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#endif |