mirror of
https://github.com/librempeg/librempeg
synced 2024-11-22 09:02:20 +00:00
270 lines
8.3 KiB
C
270 lines
8.3 KiB
C
/*
|
|
* ADX ADPCM codecs
|
|
* Copyright (c) 2001,2003 BERO
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avcodec.h"
|
|
#include "adx.h"
|
|
#include "codec_internal.h"
|
|
#include "decode.h"
|
|
#include "get_bits.h"
|
|
|
|
/**
|
|
* @file
|
|
* SEGA CRI adx codecs.
|
|
*
|
|
* Reference documents:
|
|
* http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
|
|
* adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
|
|
*/
|
|
|
|
/**
|
|
* Decode ADX stream header.
|
|
* Sets avctx->channels and avctx->sample_rate.
|
|
*
|
|
* @param avctx codec context
|
|
* @param buf header data
|
|
* @param bufsize data size, should be at least 24 bytes
|
|
* @param[out] header_size size of ADX header
|
|
* @param[out] coeff 2 LPC coefficients, can be NULL
|
|
* @return data offset or negative error code if header is invalid
|
|
*/
|
|
static int adx_decode_header(AVCodecContext *avctx, const uint8_t *buf,
|
|
int bufsize, int *header_size, int *coeff)
|
|
{
|
|
int offset, cutoff, channels;
|
|
|
|
if (bufsize < 24)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (AV_RB16(buf) != 0x8000)
|
|
return AVERROR_INVALIDDATA;
|
|
offset = AV_RB16(buf + 2) + 4;
|
|
|
|
/* if copyright string is within the provided data, validate it */
|
|
if (bufsize >= offset && offset >= 6 && memcmp(buf + offset - 6, "(c)CRI", 6))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* check for encoding=3 block_size=18, sample_size=4 */
|
|
if (buf[4] != 3 || buf[5] != 18 || buf[6] != 4) {
|
|
avpriv_request_sample(avctx, "Support for this ADX format");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
/* channels */
|
|
channels = buf[7];
|
|
if (channels <= 0 || channels > MAX_CHANNELS)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (avctx->ch_layout.nb_channels != channels) {
|
|
av_channel_layout_uninit(&avctx->ch_layout);
|
|
avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
|
|
avctx->ch_layout.nb_channels = channels;
|
|
}
|
|
|
|
/* sample rate */
|
|
avctx->sample_rate = AV_RB32(buf + 8);
|
|
if (avctx->sample_rate < 1 ||
|
|
avctx->sample_rate > INT_MAX / (channels * BLOCK_SIZE * 8))
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* bit rate */
|
|
avctx->bit_rate = avctx->sample_rate * channels * BLOCK_SIZE * 8 / BLOCK_SAMPLES;
|
|
|
|
/* LPC coefficients */
|
|
if (coeff) {
|
|
cutoff = AV_RB16(buf + 16);
|
|
ff_adx_calculate_coeffs(cutoff, avctx->sample_rate, COEFF_BITS, coeff);
|
|
}
|
|
|
|
*header_size = offset;
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int adx_decode_init(AVCodecContext *avctx)
|
|
{
|
|
ADXContext *c = avctx->priv_data;
|
|
int ret, header_size;
|
|
|
|
if (avctx->extradata_size >= 24) {
|
|
if ((ret = adx_decode_header(avctx, avctx->extradata,
|
|
avctx->extradata_size, &header_size,
|
|
c->coeff)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "error parsing ADX header\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
c->channels = avctx->ch_layout.nb_channels;
|
|
c->header_parsed = 1;
|
|
}
|
|
|
|
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode 32 samples from 18 bytes.
|
|
*
|
|
* A 16-bit scalar value is applied to 32 residuals, which then have a
|
|
* 2nd-order LPC filter applied to it to form the output signal for a single
|
|
* channel.
|
|
*/
|
|
static int adx_decode(ADXContext *c, int16_t *out, int offset,
|
|
const uint8_t *in, int ch)
|
|
{
|
|
ADXChannelState *prev = &c->prev[ch];
|
|
GetBitContext gb;
|
|
int scale = AV_RB16(in);
|
|
int i;
|
|
int s0, s1, s2, d;
|
|
|
|
/* check if this is an EOF packet */
|
|
if (scale & 0x8000)
|
|
return -1;
|
|
|
|
init_get_bits(&gb, in + 2, (BLOCK_SIZE - 2) * 8);
|
|
out += offset;
|
|
s1 = prev->s1;
|
|
s2 = prev->s2;
|
|
for (i = 0; i < BLOCK_SAMPLES; i++) {
|
|
d = get_sbits(&gb, 4);
|
|
s0 = d * scale + ((c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS);
|
|
s2 = s1;
|
|
s1 = av_clip_int16(s0);
|
|
*out++ = s1;
|
|
}
|
|
prev->s1 = s1;
|
|
prev->s2 = s2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int adx_decode_frame(AVCodecContext *avctx, AVFrame *frame,
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
{
|
|
int buf_size = avpkt->size;
|
|
ADXContext *c = avctx->priv_data;
|
|
int16_t **samples;
|
|
int samples_offset;
|
|
const uint8_t *buf = avpkt->data;
|
|
const uint8_t *buf_end = buf + avpkt->size;
|
|
int num_blocks, ch, ret;
|
|
size_t new_extradata_size;
|
|
uint8_t *new_extradata;
|
|
|
|
new_extradata = av_packet_get_side_data(avpkt, AV_PKT_DATA_NEW_EXTRADATA,
|
|
&new_extradata_size);
|
|
if (new_extradata && new_extradata_size > 0) {
|
|
int header_size;
|
|
if ((ret = adx_decode_header(avctx, new_extradata,
|
|
new_extradata_size, &header_size,
|
|
c->coeff)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "error parsing new ADX extradata\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
c->eof = 0;
|
|
}
|
|
|
|
if (c->eof) {
|
|
*got_frame_ptr = 0;
|
|
return buf_size;
|
|
}
|
|
|
|
if (!c->header_parsed && buf_size >= 2 && AV_RB16(buf) == 0x8000) {
|
|
int header_size;
|
|
if ((ret = adx_decode_header(avctx, buf, buf_size, &header_size,
|
|
c->coeff)) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "error parsing ADX header\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
c->channels = avctx->ch_layout.nb_channels;
|
|
c->header_parsed = 1;
|
|
if (buf_size < header_size)
|
|
return AVERROR_INVALIDDATA;
|
|
buf += header_size;
|
|
buf_size -= header_size;
|
|
}
|
|
if (!c->header_parsed)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* calculate number of blocks in the packet */
|
|
num_blocks = buf_size / (BLOCK_SIZE * c->channels);
|
|
|
|
/* if the packet is not an even multiple of BLOCK_SIZE, check for an EOF
|
|
packet */
|
|
if (!num_blocks || buf_size % (BLOCK_SIZE * c->channels)) {
|
|
if (buf_size >= 4 && (AV_RB16(buf) & 0x8000)) {
|
|
c->eof = 1;
|
|
*got_frame_ptr = 0;
|
|
return avpkt->size;
|
|
}
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
/* get output buffer */
|
|
frame->nb_samples = num_blocks * BLOCK_SAMPLES;
|
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
|
|
return ret;
|
|
samples = (int16_t **)frame->extended_data;
|
|
samples_offset = 0;
|
|
|
|
while (num_blocks--) {
|
|
for (ch = 0; ch < c->channels; ch++) {
|
|
if (buf_end - buf < BLOCK_SIZE || adx_decode(c, samples[ch], samples_offset, buf, ch)) {
|
|
c->eof = 1;
|
|
buf = avpkt->data + avpkt->size;
|
|
break;
|
|
}
|
|
buf_size -= BLOCK_SIZE;
|
|
buf += BLOCK_SIZE;
|
|
}
|
|
if (!c->eof)
|
|
samples_offset += BLOCK_SAMPLES;
|
|
}
|
|
|
|
frame->nb_samples = samples_offset;
|
|
*got_frame_ptr = 1;
|
|
|
|
return buf - avpkt->data;
|
|
}
|
|
|
|
static void adx_decode_flush(AVCodecContext *avctx)
|
|
{
|
|
ADXContext *c = avctx->priv_data;
|
|
memset(c->prev, 0, sizeof(c->prev));
|
|
c->eof = 0;
|
|
}
|
|
|
|
const FFCodec ff_adpcm_adx_decoder = {
|
|
.p.name = "adpcm_adx",
|
|
CODEC_LONG_NAME("SEGA CRI ADX ADPCM"),
|
|
.p.type = AVMEDIA_TYPE_AUDIO,
|
|
.p.id = AV_CODEC_ID_ADPCM_ADX,
|
|
.priv_data_size = sizeof(ADXContext),
|
|
.init = adx_decode_init,
|
|
FF_CODEC_DECODE_CB(adx_decode_frame),
|
|
.flush = adx_decode_flush,
|
|
.p.capabilities = AV_CODEC_CAP_CHANNEL_CONF |
|
|
AV_CODEC_CAP_DR1,
|
|
.p.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
|
|
AV_SAMPLE_FMT_NONE },
|
|
};
|