* Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
* based upon libdemac from Dave Chapman.
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "get_bits.h"
#include "bytestream.h"
#include "libavutil/audioconvert.h"
+#include "libavutil/avassert.h"
/**
* @file
uint32_t CRC; ///< frame CRC
int frameflags; ///< frame flags
- int currentframeblocks; ///< samples (per channel) in current frame
- int blocksdecoded; ///< count of decoded samples in current frame
APEPredictor predictor; ///< predictor used for final reconstruction
int32_t decoded0[BLOCKS_PER_LOOP]; ///< decoded data for the first channel
uint8_t *data; ///< current frame data
uint8_t *data_end; ///< frame data end
const uint8_t *ptr; ///< current position in frame data
- const uint8_t *last_ptr; ///< position where last 4608-sample block ended
int error;
} APEContext;
// TODO: dsputilize
-static av_cold int ape_decode_init(AVCodecContext * avctx)
+static av_cold int ape_decode_close(AVCodecContext *avctx)
+{
+ APEContext *s = avctx->priv_data;
+ int i;
+
+ for (i = 0; i < APE_FILTER_LEVELS; i++)
+ av_freep(&s->filterbuf[i]);
+
+ av_freep(&s->data);
+ return 0;
+}
+
+static av_cold int ape_decode_init(AVCodecContext *avctx)
{
APEContext *s = avctx->priv_data;
int i;
if (avctx->extradata_size != 6) {
av_log(avctx, AV_LOG_ERROR, "Incorrect extradata\n");
- return -1;
+ return AVERROR(EINVAL);
}
if (avctx->bits_per_coded_sample != 16) {
av_log(avctx, AV_LOG_ERROR, "Only 16-bit samples are supported\n");
- return -1;
+ return AVERROR(EINVAL);
}
if (avctx->channels > 2) {
av_log(avctx, AV_LOG_ERROR, "Only mono and stereo is supported\n");
- return -1;
+ return AVERROR(EINVAL);
}
s->avctx = avctx;
s->channels = avctx->channels;
s->compression_level = AV_RL16(avctx->extradata + 2);
s->flags = AV_RL16(avctx->extradata + 4);
- av_log(avctx, AV_LOG_DEBUG, "Compression Level: %d - Flags: %d\n", s->compression_level, s->flags);
+ av_log(avctx, AV_LOG_DEBUG, "Compression Level: %d - Flags: %d\n",
+ s->compression_level, s->flags);
if (s->compression_level % 1000 || s->compression_level > COMPRESSION_LEVEL_INSANE) {
- av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n", s->compression_level);
- return -1;
+ av_log(avctx, AV_LOG_ERROR, "Incorrect compression level %d\n",
+ s->compression_level);
+ return AVERROR_INVALIDDATA;
}
s->fset = s->compression_level / 1000 - 1;
for (i = 0; i < APE_FILTER_LEVELS; i++) {
if (!ape_filter_orders[s->fset][i])
break;
- s->filterbuf[i] = av_malloc((ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4);
+ FF_ALLOC_OR_GOTO(avctx, s->filterbuf[i],
+ (ape_filter_orders[s->fset][i] * 3 + HISTORY_SIZE) * 4,
+ filter_alloc_fail);
}
dsputil_init(&s->dsp, avctx);
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
return 0;
-}
-
-static av_cold int ape_decode_close(AVCodecContext * avctx)
-{
- APEContext *s = avctx->priv_data;
- int i;
-
- for (i = 0; i < APE_FILTER_LEVELS; i++)
- av_freep(&s->filterbuf[i]);
-
- av_freep(&s->data);
- return 0;
+filter_alloc_fail:
+ ape_decode_close(avctx);
+ return AVERROR(ENOMEM);
}
/**
#define BOTTOM_VALUE (TOP_VALUE >> 8)
/** Start the decoder */
-static inline void range_start_decoding(APEContext * ctx)
+static inline void range_start_decoding(APEContext *ctx)
{
ctx->rc.buffer = bytestream_get_byte(&ctx->ptr);
ctx->rc.low = ctx->rc.buffer >> (8 - EXTRA_BITS);
}
/** Perform normalization */
-static inline void range_dec_normalize(APEContext * ctx)
+static inline void range_dec_normalize(APEContext *ctx)
{
while (ctx->rc.range <= BOTTOM_VALUE) {
ctx->rc.buffer <<= 8;
- if(ctx->ptr < ctx->data_end)
+ if(ctx->ptr < ctx->data_end) {
ctx->rc.buffer += *ctx->ptr;
- ctx->ptr++;
+ ctx->ptr++;
+ } else {
+ ctx->error = 1;
+ }
ctx->rc.low = (ctx->rc.low << 8) | ((ctx->rc.buffer >> 1) & 0xFF);
ctx->rc.range <<= 8;
}
* @param tot_f is the total frequency or (code_value)1<<shift
* @return the culmulative frequency
*/
-static inline int range_decode_culfreq(APEContext * ctx, int tot_f)
+static inline int range_decode_culfreq(APEContext *ctx, int tot_f)
{
range_dec_normalize(ctx);
ctx->rc.help = ctx->rc.range / tot_f;
* @param ctx decoder context
* @param shift number of bits to decode
*/
-static inline int range_decode_culshift(APEContext * ctx, int shift)
+static inline int range_decode_culshift(APEContext *ctx, int shift)
{
range_dec_normalize(ctx);
ctx->rc.help = ctx->rc.range >> shift;
* @param sy_f the interval length (frequency of the symbol)
* @param lt_f the lower end (frequency sum of < symbols)
*/
-static inline void range_decode_update(APEContext * ctx, int sy_f, int lt_f)
+static inline void range_decode_update(APEContext *ctx, int sy_f, int lt_f)
{
ctx->rc.low -= ctx->rc.help * lt_f;
ctx->rc.range = ctx->rc.help * sy_f;
}
/** Decode n bits (n <= 16) without modelling */
-static inline int range_decode_bits(APEContext * ctx, int n)
+static inline int range_decode_bits(APEContext *ctx, int n)
{
int sym = range_decode_culshift(ctx, n);
range_decode_update(ctx, 1, sym);
* @param counts probability range start position
* @param counts_diff probability range widths
*/
-static inline int range_get_symbol(APEContext * ctx,
+static inline int range_get_symbol(APEContext *ctx,
const uint16_t counts[],
const uint16_t counts_diff[])
{
rice->k++;
}
-static inline int ape_decode_value(APEContext * ctx, APERice *rice)
+static inline int ape_decode_value(APEContext *ctx, APERice *rice)
{
int x, overflow;
return -(x >> 1);
}
-static void entropy_decode(APEContext * ctx, int blockstodecode, int stereo)
+static void entropy_decode(APEContext *ctx, int blockstodecode, int stereo)
{
int32_t *decoded0 = ctx->decoded0;
int32_t *decoded1 = ctx->decoded1;
- ctx->blocksdecoded = blockstodecode;
-
if (ctx->frameflags & APE_FRAMECODE_STEREO_SILENCE) {
/* We are pure silence, just memset the output buffer. */
memset(decoded0, 0, blockstodecode * sizeof(int32_t));
*decoded1++ = ape_decode_value(ctx, &ctx->riceX);
}
}
-
- if (ctx->blocksdecoded == ctx->currentframeblocks)
- range_dec_normalize(ctx); /* normalize to use up all bytes */
}
-static void init_entropy_decoder(APEContext * ctx)
+static int init_entropy_decoder(APEContext *ctx)
{
/* Read the CRC */
+ if (ctx->data_end - ctx->ptr < 6)
+ return AVERROR_INVALIDDATA;
ctx->CRC = bytestream_get_be32(&ctx->ptr);
/* Read the frame flags if they exist */
if ((ctx->fileversion > 3820) && (ctx->CRC & 0x80000000)) {
ctx->CRC &= ~0x80000000;
+ if (ctx->data_end - ctx->ptr < 6)
+ return AVERROR_INVALIDDATA;
ctx->frameflags = bytestream_get_be32(&ctx->ptr);
}
- /* Keep a count of the blocks decoded in this frame */
- ctx->blocksdecoded = 0;
-
/* Initialize the rice structs */
ctx->riceX.k = 10;
ctx->riceX.ksum = (1 << ctx->riceX.k) * 16;
ctx->ptr++;
range_start_decoding(ctx);
+
+ return 0;
}
static const int32_t initial_coeffs[4] = {
360, 317, -109, 98
};
-static void init_predictor_decoder(APEContext * ctx)
+static void init_predictor_decoder(APEContext *ctx)
{
APEPredictor *p = &ctx->predictor;
return (x < 0) - (x > 0);
}
-static av_always_inline int predictor_update_filter(APEPredictor *p, const int decoded, const int filter, const int delayA, const int delayB, const int adaptA, const int adaptB)
+static av_always_inline int predictor_update_filter(APEPredictor *p,
+ const int decoded, const int filter,
+ const int delayA, const int delayB,
+ const int adaptA, const int adaptB)
{
int32_t predictionA, predictionB, sign;
return p->filterA[filter];
}
-static void predictor_decode_stereo(APEContext * ctx, int count)
+static void predictor_decode_stereo(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
int32_t *decoded0 = ctx->decoded0;
while (count--) {
/* Predictor Y */
- *decoded0 = predictor_update_filter(p, *decoded0, 0, YDELAYA, YDELAYB, YADAPTCOEFFSA, YADAPTCOEFFSB);
+ *decoded0 = predictor_update_filter(p, *decoded0, 0, YDELAYA, YDELAYB,
+ YADAPTCOEFFSA, YADAPTCOEFFSB);
decoded0++;
- *decoded1 = predictor_update_filter(p, *decoded1, 1, XDELAYA, XDELAYB, XADAPTCOEFFSA, XADAPTCOEFFSB);
+ *decoded1 = predictor_update_filter(p, *decoded1, 1, XDELAYA, XDELAYB,
+ XADAPTCOEFFSA, XADAPTCOEFFSB);
decoded1++;
/* Combined */
}
}
-static void predictor_decode_mono(APEContext * ctx, int count)
+static void predictor_decode_mono(APEContext *ctx, int count)
{
APEPredictor *p = &ctx->predictor;
int32_t *decoded0 = ctx->decoded0;
p->lastA[0] = currentA;
}
-static void do_init_filter(APEFilter *f, int16_t * buf, int order)
+static void do_init_filter(APEFilter *f, int16_t *buf, int order)
{
f->coeffs = buf;
f->historybuffer = buf + order;
f->avg = 0;
}
-static void init_filter(APEContext * ctx, APEFilter *f, int16_t * buf, int order)
+static void init_filter(APEContext *ctx, APEFilter *f, int16_t *buf, int order)
{
do_init_filter(&f[0], buf, order);
do_init_filter(&f[1], buf + order * 3 + HISTORY_SIZE, order);
}
-static void do_apply_filter(APEContext * ctx, int version, APEFilter *f, int32_t *data, int count, int order, int fracbits)
+static void do_apply_filter(APEContext *ctx, int version, APEFilter *f,
+ int32_t *data, int count, int order, int fracbits)
{
int res;
int absres;
while (count--) {
/* round fixedpoint scalar product */
- res = ctx->dsp.scalarproduct_and_madd_int16(f->coeffs, f->delay - order, f->adaptcoeffs - order, order, APESIGN(*data));
+ res = ctx->dsp.scalarproduct_and_madd_int16(f->coeffs, f->delay - order,
+ f->adaptcoeffs - order,
+ order, APESIGN(*data));
res = (res + (1 << (fracbits - 1))) >> fracbits;
res += *data;
*data++ = res;
/* Update the adaption coefficients */
absres = FFABS(res);
if (absres)
- *f->adaptcoeffs = ((res & (1<<31)) - (1<<30)) >> (25 + (absres <= f->avg*3) + (absres <= f->avg*4/3));
+ *f->adaptcoeffs = ((res & (1<<31)) - (1<<30)) >>
+ (25 + (absres <= f->avg*3) + (absres <= f->avg*4/3));
else
*f->adaptcoeffs = 0;
}
}
-static void apply_filter(APEContext * ctx, APEFilter *f,
- int32_t * data0, int32_t * data1,
+static void apply_filter(APEContext *ctx, APEFilter *f,
+ int32_t *data0, int32_t *data1,
int count, int order, int fracbits)
{
do_apply_filter(ctx, ctx->fileversion, &f[0], data0, count, order, fracbits);
do_apply_filter(ctx, ctx->fileversion, &f[1], data1, count, order, fracbits);
}
-static void ape_apply_filters(APEContext * ctx, int32_t * decoded0,
- int32_t * decoded1, int count)
+static void ape_apply_filters(APEContext *ctx, int32_t *decoded0,
+ int32_t *decoded1, int count)
{
int i;
for (i = 0; i < APE_FILTER_LEVELS; i++) {
if (!ape_filter_orders[ctx->fset][i])
break;
- apply_filter(ctx, ctx->filters[i], decoded0, decoded1, count, ape_filter_orders[ctx->fset][i], ape_filter_fracbits[ctx->fset][i]);
+ apply_filter(ctx, ctx->filters[i], decoded0, decoded1, count,
+ ape_filter_orders[ctx->fset][i],
+ ape_filter_fracbits[ctx->fset][i]);
}
}
-static void init_frame_decoder(APEContext * ctx)
+static int init_frame_decoder(APEContext *ctx)
{
- int i;
- init_entropy_decoder(ctx);
+ int i, ret;
+ if ((ret = init_entropy_decoder(ctx)) < 0)
+ return ret;
init_predictor_decoder(ctx);
for (i = 0; i < APE_FILTER_LEVELS; i++) {
if (!ape_filter_orders[ctx->fset][i])
break;
- init_filter(ctx, ctx->filters[i], ctx->filterbuf[i], ape_filter_orders[ctx->fset][i]);
+ init_filter(ctx, ctx->filters[i], ctx->filterbuf[i],
+ ape_filter_orders[ctx->fset][i]);
}
+ return 0;
}
-static void ape_unpack_mono(APEContext * ctx, int count)
+static void ape_unpack_mono(APEContext *ctx, int count)
{
int32_t *decoded0 = ctx->decoded0;
int32_t *decoded1 = ctx->decoded1;
}
}
-static void ape_unpack_stereo(APEContext * ctx, int count)
+static void ape_unpack_stereo(APEContext *ctx, int count)
{
int32_t left, right;
int32_t *decoded0 = ctx->decoded0;
}
}
-static int ape_decode_frame(AVCodecContext * avctx,
+static int ape_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
AVPacket *avpkt)
{
int buf_size = avpkt->size;
APEContext *s = avctx->priv_data;
int16_t *samples = data;
- int nblocks;
- int i, n;
- int blockstodecode;
- int bytes_used;
-
- /* should not happen but who knows */
- if (BLOCKS_PER_LOOP * 2 * avctx->channels > *data_size) {
- av_log (avctx, AV_LOG_ERROR, "Packet size is too big to be handled in lavc! (max is %d where you have %d)\n", *data_size, s->samples * 2 * avctx->channels);
- return -1;
- }
+ int i;
+ int blockstodecode, out_size;
+ int bytes_used = 0;
+
+ /* this should never be negative, but bad things will happen if it is, so
+ check it just to make sure. */
+ av_assert0(s->samples >= 0);
if(!s->samples){
- s->data = av_realloc(s->data, (buf_size + 3) & ~3);
+ uint32_t nblocks, offset;
+ void *tmp_data;
+
+ if (!buf_size) {
+ *data_size = 0;
+ return 0;
+ }
+ if (buf_size < 8) {
+ av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ tmp_data = av_realloc(s->data, FFALIGN(buf_size, 4));
+ if (!tmp_data)
+ return AVERROR(ENOMEM);
+ s->data = tmp_data;
s->dsp.bswap_buf((uint32_t*)s->data, (const uint32_t*)buf, buf_size >> 2);
- s->ptr = s->last_ptr = s->data;
+ s->ptr = s->data;
s->data_end = s->data + buf_size;
- nblocks = s->samples = bytestream_get_be32(&s->ptr);
- n = bytestream_get_be32(&s->ptr);
- if(n < 0 || n > 3){
+ nblocks = bytestream_get_be32(&s->ptr);
+ offset = bytestream_get_be32(&s->ptr);
+ if (offset > 3) {
av_log(avctx, AV_LOG_ERROR, "Incorrect offset passed\n");
s->data = NULL;
- return -1;
+ return AVERROR_INVALIDDATA;
+ }
+ if (s->data_end - s->ptr < offset) {
+ av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
+ return AVERROR_INVALIDDATA;
}
- s->ptr += n;
+ s->ptr += offset;
- s->currentframeblocks = nblocks;
- buf += 4;
- if (s->samples <= 0) {
- *data_size = 0;
- return buf_size;
+ if (!nblocks || nblocks > INT_MAX) {
+ av_log(avctx, AV_LOG_ERROR, "Invalid sample count: %u.\n", nblocks);
+ return AVERROR_INVALIDDATA;
}
+ s->samples = nblocks;
memset(s->decoded0, 0, sizeof(s->decoded0));
memset(s->decoded1, 0, sizeof(s->decoded1));
/* Initialize the frame decoder */
- init_frame_decoder(s);
+ if (init_frame_decoder(s) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "Error reading frame header\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ bytes_used = buf_size;
}
if (!s->data) {
return buf_size;
}
- nblocks = s->samples;
- blockstodecode = FFMIN(BLOCKS_PER_LOOP, nblocks);
+ blockstodecode = FFMIN(BLOCKS_PER_LOOP, s->samples);
+
+ out_size = blockstodecode * avctx->channels *
+ av_get_bytes_per_sample(avctx->sample_fmt);
+ if (*data_size < out_size) {
+ av_log(avctx, AV_LOG_ERROR, "Output buffer is too small.\n");
+ return AVERROR(EINVAL);
+ }
s->error=0;
ape_unpack_stereo(s, blockstodecode);
emms_c();
- if(s->error || s->ptr > s->data_end){
+ if (s->error) {
s->samples=0;
av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
- return -1;
+ return AVERROR_INVALIDDATA;
}
for (i = 0; i < blockstodecode; i++) {
s->samples -= blockstodecode;
- *data_size = blockstodecode * 2 * s->channels;
- bytes_used = s->samples ? s->ptr - s->last_ptr : buf_size;
- s->last_ptr = s->ptr;
+ *data_size = out_size;
return bytes_used;
}
.init = ape_decode_init,
.close = ape_decode_close,
.decode = ape_decode_frame,
- .capabilities = CODEC_CAP_SUBFRAMES,
+ .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY,
.flush = ape_flush,
.long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"),
};
projects / ffmpeg / blobdiff