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avcodec/adx: Move ff_adx_decode_header() to adxdec.c

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Possible since 9325d88eba.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-09-16 09:05:20 +02:00
parent 53523ed530
commit b15a2f2504
3 changed files with 71 additions and 79 deletions
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53
libavcodec/adx.c
View File

@ -19,7 +19,6 @@
*/
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "adx.h"
@ -34,55 +33,3 @@ void ff_adx_calculate_coeffs(int cutoff, int sample_rate, int bits, int *coeff)
coeff[0] = lrintf(c * 2.0 * (1 << bits));
coeff[1] = lrintf(-(c * c) * (1 << bits));
}
int ff_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 > 2)
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;
}

18
libavcodec/adx.h
View File

@ -31,10 +31,6 @@
#ifndef AVCODEC_ADX_H
#define AVCODEC_ADX_H
#include <stdint.h>
#include "avcodec.h"
typedef struct ADXChannelState {
int s1,s2;
} ADXChannelState;
@ -63,18 +59,4 @@ typedef struct ADXContext {
*/
void ff_adx_calculate_coeffs(int cutoff, int sample_rate, int bits, int *coeff);
/**
* 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
*/
int ff_adx_decode_header(AVCodecContext *avctx, const uint8_t *buf,
int bufsize, int *header_size, int *coeff);
#endif /* AVCODEC_ADX_H */

79
libavcodec/adxdec.c
View File

@ -35,15 +35,78 @@
* 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 > 2)
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 = ff_adx_decode_header(avctx, avctx->extradata,
avctx->extradata_size, &header_size,
c->coeff)) < 0) {
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;
}
@ -110,9 +173,9 @@ static int adx_decode_frame(AVCodecContext *avctx, AVFrame *frame,
&new_extradata_size);
if (new_extradata && new_extradata_size > 0) {
int header_size;
if ((ret = ff_adx_decode_header(avctx, new_extradata,
new_extradata_size, &header_size,
c->coeff)) < 0) {
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;
}
@ -127,8 +190,8 @@ static int adx_decode_frame(AVCodecContext *avctx, AVFrame *frame,
if (!c->header_parsed && buf_size >= 2 && AV_RB16(buf) == 0x8000) {
int header_size;
if ((ret = ff_adx_decode_header(avctx, buf, buf_size, &header_size,
c->coeff)) < 0) {
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;
}