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avcodec/apedec: fix decoding 24bit insane files with recent versions

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This commit is contained in:
Paul B Mahol 2020-10-05 22:24:13 +02:00
parent af5ad79fe1
commit ed0001482a
1 changed files with 46 additions and 13 deletions
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59
libavcodec/apedec.c
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@ -133,6 +133,21 @@ typedef struct APEPredictor {
unsigned int sample_pos;
} APEPredictor;
typedef struct APEPredictor64 {
int64_t *buf;
int64_t lastA[2];
int64_t filterA[2];
int64_t filterB[2];
uint64_t coeffsA[2][4]; ///< adaption coefficients
uint64_t coeffsB[2][5]; ///< adaption coefficients
int64_t historybuffer[HISTORY_SIZE + PREDICTOR_SIZE];
unsigned int sample_pos;
} APEPredictor64;
/** Decoder context */
typedef struct APEContext {
AVClass *class; ///< class for AVOptions
@ -152,6 +167,7 @@ typedef struct APEContext {
uint32_t CRC_state; ///< accumulated CRC
int frameflags; ///< frame flags
APEPredictor predictor; ///< predictor used for final reconstruction
APEPredictor64 predictor64; ///< 64bit predictor used for final reconstruction
int32_t *decoded_buffer;
int decoded_size;
@ -789,13 +805,20 @@ static const int32_t initial_coeffs_3930[4] = {
360, 317, -109, 98
};
static const int64_t initial_coeffs_3930_64bit[4] = {
360, 317, -109, 98
};
static void init_predictor_decoder(APEContext *ctx)
{
APEPredictor *p = &ctx->predictor;
APEPredictor64 *p64 = &ctx->predictor64;
/* Zero the history buffers */
memset(p->historybuffer, 0, PREDICTOR_SIZE * sizeof(*p->historybuffer));
memset(p64->historybuffer, 0, PREDICTOR_SIZE * sizeof(*p64->historybuffer));
p->buf = p->historybuffer;
p64->buf = p64->historybuffer;
/* Initialize and zero the coefficients */
if (ctx->fileversion < 3930) {
@ -813,8 +836,11 @@ static void init_predictor_decoder(APEContext *ctx)
} else {
memcpy(p->coeffsA[0], initial_coeffs_3930, sizeof(initial_coeffs_3930));
memcpy(p->coeffsA[1], initial_coeffs_3930, sizeof(initial_coeffs_3930));
memcpy(p64->coeffsA[0], initial_coeffs_3930_64bit, sizeof(initial_coeffs_3930_64bit));
memcpy(p64->coeffsA[1], initial_coeffs_3930_64bit, sizeof(initial_coeffs_3930_64bit));
}
memset(p->coeffsB, 0, sizeof(p->coeffsB));
memset(p64->coeffsB, 0, sizeof(p64->coeffsB));
if (ctx->fileversion < 3930) {
memcpy(p->coeffsB[0], initial_coeffs_b_3800,
sizeof(initial_coeffs_b_3800));
@ -826,7 +852,13 @@ static void init_predictor_decoder(APEContext *ctx)
p->filterB[0] = p->filterB[1] = 0;
p->lastA[0] = p->lastA[1] = 0;
p64->filterA[0] = p64->filterA[1] = 0;
p64->filterB[0] = p64->filterB[1] = 0;
p64->lastA[0] = p64->lastA[1] = 0;
p->sample_pos = 0;
p64->sample_pos = 0;
}
/** Get inverse sign of integer (-1 for positive, 1 for negative and 0 for zero) */
@ -1132,16 +1164,17 @@ static void predictor_decode_mono_3930(APEContext *ctx, int count)
}
}
static av_always_inline int predictor_update_filter(APEPredictor *p,
static av_always_inline int predictor_update_filter(APEPredictor64 *p,
const int decoded, const int filter,
const int delayA, const int delayB,
const int adaptA, const int adaptB)
{
int32_t predictionA, predictionB, sign;
int64_t predictionA, predictionB;
int32_t sign;
p->buf[delayA] = p->lastA[filter];
p->buf[adaptA] = APESIGN(p->buf[delayA]);
p->buf[delayA - 1] = p->buf[delayA] - (unsigned)p->buf[delayA - 1];
p->buf[delayA - 1] = p->buf[delayA] - (uint64_t)p->buf[delayA - 1];
p->buf[adaptA - 1] = APESIGN(p->buf[delayA - 1]);
predictionA = p->buf[delayA ] * p->coeffsA[filter][0] +
@ -1150,9 +1183,9 @@ static av_always_inline int predictor_update_filter(APEPredictor *p,
p->buf[delayA - 3] * p->coeffsA[filter][3];
/* Apply a scaled first-order filter compression */
p->buf[delayB] = p->filterA[filter ^ 1] - ((int)(p->filterB[filter] * 31U) >> 5);
p->buf[delayB] = p->filterA[filter ^ 1] - ((int64_t)(p->filterB[filter] * 31ULL) >> 5);
p->buf[adaptB] = APESIGN(p->buf[delayB]);
p->buf[delayB - 1] = p->buf[delayB] - (unsigned)p->buf[delayB - 1];
p->buf[delayB - 1] = p->buf[delayB] - (uint64_t)p->buf[delayB - 1];
p->buf[adaptB - 1] = APESIGN(p->buf[delayB - 1]);
p->filterB[filter] = p->filterA[filter ^ 1];
@ -1162,8 +1195,8 @@ static av_always_inline int predictor_update_filter(APEPredictor *p,
p->buf[delayB - 3] * p->coeffsB[filter][3] +
p->buf[delayB - 4] * p->coeffsB[filter][4];
p->lastA[filter] = decoded + ((int)((unsigned)predictionA + (predictionB >> 1)) >> 10);
p->filterA[filter] = p->lastA[filter] + ((int)(p->filterA[filter] * 31U) >> 5);
p->lastA[filter] = decoded + ((int64_t)((uint64_t)predictionA + (predictionB >> 1)) >> 10);
p->filterA[filter] = p->lastA[filter] + ((int64_t)(p->filterA[filter] * 31ULL) >> 5);
sign = APESIGN(decoded);
p->coeffsA[filter][0] += p->buf[adaptA ] * sign;
@ -1181,7 +1214,7 @@ static av_always_inline int predictor_update_filter(APEPredictor *p,
static void predictor_decode_stereo_3950(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
APEPredictor64 *p = &ctx->predictor64;
int32_t *decoded0 = ctx->decoded[0];
int32_t *decoded1 = ctx->decoded[1];
@ -1210,7 +1243,7 @@ static void predictor_decode_stereo_3950(APEContext *ctx, int count)
static void predictor_decode_mono_3950(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
APEPredictor64 *p = &ctx->predictor64;
int32_t *decoded0 = ctx->decoded[0];
int32_t predictionA, currentA, A, sign;
@ -1222,14 +1255,14 @@ static void predictor_decode_mono_3950(APEContext *ctx, int count)
A = *decoded0;
p->buf[YDELAYA] = currentA;
p->buf[YDELAYA - 1] = p->buf[YDELAYA] - (unsigned)p->buf[YDELAYA - 1];
p->buf[YDELAYA - 1] = p->buf[YDELAYA] - (uint64_t)p->buf[YDELAYA - 1];
predictionA = p->buf[YDELAYA ] * p->coeffsA[0][0] +
p->buf[YDELAYA - 1] * p->coeffsA[0][1] +
p->buf[YDELAYA - 2] * p->coeffsA[0][2] +
p->buf[YDELAYA - 3] * p->coeffsA[0][3];
currentA = A + (unsigned)(predictionA >> 10);
currentA = A + (uint64_t)(predictionA >> 10);
p->buf[YADAPTCOEFFSA] = APESIGN(p->buf[YDELAYA ]);
p->buf[YADAPTCOEFFSA - 1] = APESIGN(p->buf[YDELAYA - 1]);
@ -1249,7 +1282,7 @@ static void predictor_decode_mono_3950(APEContext *ctx, int count)
p->buf = p->historybuffer;
}
p->filterA[0] = currentA + (unsigned)((int)(p->filterA[0] * 31U) >> 5);
p->filterA[0] = currentA + (uint64_t)((int64_t)(p->filterA[0] * 31U) >> 5);
*(decoded0++) = p->filterA[0];
}
@ -1286,7 +1319,7 @@ static void do_apply_filter(APEContext *ctx, int version, APEFilter *f,
f->delay - order,
f->adaptcoeffs - order,
order, APESIGN(*data));
res = (int)(res + (1U << (fracbits - 1))) >> fracbits;
res = (int64_t)(res + (1LL << (fracbits - 1))) >> fracbits;
res += (unsigned)*data;
*data++ = res;