virtualenv/FFmpeg
1
0
Fork 0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-21 10:55:51 +02:00
Code Issues Releases Activity

adpcm: convert VLAs to malloc/free

Browse Source 
Originally committed as revision 23819 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2010-06-27 09:44:10 +00:00
parent 9577838f2f
commit 07ece20c69
1 changed files with 83 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

140
libavcodec/adpcm.c
View File

@ -145,15 +145,34 @@ typedef struct ADPCMChannelStatus {
int idelta;
} ADPCMChannelStatus;
typedef struct TrellisPath {
int nibble;
int prev;
} TrellisPath;
typedef struct TrellisNode {
uint32_t ssd;
int path;
int sample1;
int sample2;
int step;
} TrellisNode;
typedef struct ADPCMContext {
ADPCMChannelStatus status[6];
TrellisPath *paths;
TrellisNode *node_buf;
TrellisNode **nodep_buf;
} ADPCMContext;
#define FREEZE_INTERVAL 128
/* XXX: implement encoding */
#if CONFIG_ENCODERS
static av_cold int adpcm_encode_init(AVCodecContext *avctx)
{
ADPCMContext *s = avctx->priv_data;
uint8_t *extradata;
int i;
if (avctx->channels > 2)
@ -164,6 +183,14 @@ static av_cold int adpcm_encode_init(AVCodecContext *avctx)
return -1;
}
if (avctx->trellis) {
int frontier = 1 << avctx->trellis;
int max_paths = frontier * FREEZE_INTERVAL;
FF_ALLOC_OR_GOTO(avctx, s->paths, max_paths * sizeof(*s->paths), error);
FF_ALLOC_OR_GOTO(avctx, s->node_buf, 2 * frontier * sizeof(*s->node_buf), error);
FF_ALLOC_OR_GOTO(avctx, s->nodep_buf, 2 * frontier * sizeof(*s->nodep_buf), error);
}
switch(avctx->codec->id) {
case CODEC_ID_ADPCM_IMA_WAV:
avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */
@ -199,23 +226,32 @@ static av_cold int adpcm_encode_init(AVCodecContext *avctx)
avctx->sample_rate != 22050 &&
avctx->sample_rate != 44100) {
av_log(avctx, AV_LOG_ERROR, "Sample rate must be 11025, 22050 or 44100\n");
return -1;
goto error;
}
avctx->frame_size = 512 * (avctx->sample_rate / 11025);
break;
default:
return -1;
goto error;
}
avctx->coded_frame= avcodec_alloc_frame();
avctx->coded_frame->key_frame= 1;
return 0;
error:
av_freep(&s->paths);
av_freep(&s->node_buf);
av_freep(&s->nodep_buf);
return -1;
}
static av_cold int adpcm_encode_close(AVCodecContext *avctx)
{
ADPCMContext *s = avctx->priv_data;
av_freep(&avctx->coded_frame);
av_freep(&s->paths);
av_freep(&s->node_buf);
av_freep(&s->nodep_buf);
return 0;
}
@ -276,39 +312,23 @@ static inline unsigned char adpcm_yamaha_compress_sample(ADPCMChannelStatus *c,
return nibble;
}
typedef struct TrellisPath {
int nibble;
int prev;
} TrellisPath;
typedef struct TrellisNode {
uint32_t ssd;
int path;
int sample1;
int sample2;
int step;
} TrellisNode;
static void adpcm_compress_trellis(AVCodecContext *avctx, const short *samples,
uint8_t *dst, ADPCMChannelStatus *c, int n)
{
#define FREEZE_INTERVAL 128
//FIXME 6% faster if frontier is a compile-time constant
ADPCMContext *s = avctx->priv_data;
const int frontier = 1 << avctx->trellis;
const int stride = avctx->channels;
const int version = avctx->codec->id;
const int max_paths = frontier*FREEZE_INTERVAL;
TrellisPath paths[max_paths], *p;
TrellisNode node_buf[2][frontier];
TrellisNode *nodep_buf[2][frontier];
TrellisNode **nodes = nodep_buf[0]; // nodes[] is always sorted by .ssd
TrellisNode **nodes_next = nodep_buf[1];
TrellisPath *paths = s->paths, *p;
TrellisNode *node_buf = s->node_buf;
TrellisNode **nodep_buf = s->nodep_buf;
TrellisNode **nodes = nodep_buf; // nodes[] is always sorted by .ssd
TrellisNode **nodes_next = nodep_buf + frontier;
int pathn = 0, froze = -1, i, j, k;
assert(!(max_paths&(max_paths-1)));
memset(nodep_buf, 0, sizeof(nodep_buf));
nodes[0] = &node_buf[1][0];
memset(nodep_buf, 0, 2 * frontier * sizeof(*nodep_buf));
nodes[0] = node_buf + frontier;
nodes[0]->ssd = 0;
nodes[0]->path = 0;
nodes[0]->step = c->step_index;
@ -329,7 +349,7 @@ static void adpcm_compress_trellis(AVCodecContext *avctx, const short *samples,
}
for(i=0; i<n; i++) {
TrellisNode *t = node_buf[i&1];
TrellisNode *t = node_buf + frontier*(i&1);
TrellisNode **u;
int sample = samples[i*stride];
memset(nodes_next, 0, frontier*sizeof(TrellisNode*));
@ -367,7 +387,7 @@ static void adpcm_compress_trellis(AVCodecContext *avctx, const short *samples,
if(!nodes_next[k] || ssd < nodes_next[k]->ssd) {\
TrellisNode *u = nodes_next[frontier-1];\
if(!u) {\
assert(pathn < max_paths);\
assert(pathn < FREEZE_INTERVAL<<avctx->trellis);\
u = t++;\
u->path = pathn++;\
}\
@ -454,6 +474,7 @@ static int adpcm_encode_frame(AVCodecContext *avctx,
short *samples;
unsigned char *dst;
ADPCMContext *c = avctx->priv_data;
uint8_t *buf;
dst = frame;
samples = (short *)data;
@ -480,22 +501,24 @@ static int adpcm_encode_frame(AVCodecContext *avctx,
/* stereo: 4 bytes (8 samples) for left, 4 bytes for right, 4 bytes left, ... */
if(avctx->trellis > 0) {
uint8_t buf[2][n*8];
adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n*8);
FF_ALLOC_OR_GOTO(avctx, buf, 2*n*8, error);
adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n*8);
if(avctx->channels == 2)
adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n*8);
adpcm_compress_trellis(avctx, samples+1, buf + n*8, &c->status[1], n*8);
for(i=0; i<n; i++) {
*dst++ = buf[0][8*i+0] | (buf[0][8*i+1] << 4);
*dst++ = buf[0][8*i+2] | (buf[0][8*i+3] << 4);
*dst++ = buf[0][8*i+4] | (buf[0][8*i+5] << 4);
*dst++ = buf[0][8*i+6] | (buf[0][8*i+7] << 4);
*dst++ = buf[8*i+0] | (buf[8*i+1] << 4);
*dst++ = buf[8*i+2] | (buf[8*i+3] << 4);
*dst++ = buf[8*i+4] | (buf[8*i+5] << 4);
*dst++ = buf[8*i+6] | (buf[8*i+7] << 4);
if (avctx->channels == 2) {
*dst++ = buf[1][8*i+0] | (buf[1][8*i+1] << 4);
*dst++ = buf[1][8*i+2] | (buf[1][8*i+3] << 4);
*dst++ = buf[1][8*i+4] | (buf[1][8*i+5] << 4);
*dst++ = buf[1][8*i+6] | (buf[1][8*i+7] << 4);
uint8_t *buf1 = buf + n*8;
*dst++ = buf1[8*i+0] | (buf1[8*i+1] << 4);
*dst++ = buf1[8*i+2] | (buf1[8*i+3] << 4);
*dst++ = buf1[8*i+4] | (buf1[8*i+5] << 4);
*dst++ = buf1[8*i+6] | (buf1[8*i+7] << 4);
}
}
av_free(buf);
} else
for (; n>0; n--) {
*dst = adpcm_ima_compress_sample(&c->status[0], samples[0]);
@ -578,15 +601,16 @@ static int adpcm_encode_frame(AVCodecContext *avctx,
}
if(avctx->trellis > 0) {
uint8_t buf[2][n];
adpcm_compress_trellis(avctx, samples+2, buf[0], &c->status[0], n);
FF_ALLOC_OR_GOTO(avctx, buf, 2*n, error);
adpcm_compress_trellis(avctx, samples+2, buf, &c->status[0], n);
if (avctx->channels == 2)
adpcm_compress_trellis(avctx, samples+3, buf[1], &c->status[1], n);
adpcm_compress_trellis(avctx, samples+3, buf+n, &c->status[1], n);
for(i=0; i<n; i++) {
put_bits(&pb, 4, buf[0][i]);
put_bits(&pb, 4, buf[i]);
if (avctx->channels == 2)
put_bits(&pb, 4, buf[1][i]);
put_bits(&pb, 4, buf[n+i]);
}
av_free(buf);
} else {
for (i=1; i<avctx->frame_size; i++) {
put_bits(&pb, 4, adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels*i]));
@ -625,18 +649,18 @@ static int adpcm_encode_frame(AVCodecContext *avctx,
if(avctx->trellis > 0) {
int n = avctx->block_align - 7*avctx->channels;
uint8_t buf[2][n];
FF_ALLOC_OR_GOTO(avctx, buf, 2*n, error);
if(avctx->channels == 1) {
n *= 2;
adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n);
for(i=0; i<n; i+=2)
*dst++ = (buf[0][i] << 4) | buf[0][i+1];
*dst++ = (buf[i] << 4) | buf[i+1];
} else {
adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n);
adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n);
adpcm_compress_trellis(avctx, samples+1, buf+n, &c->status[1], n);
for(i=0; i<n; i++)
*dst++ = (buf[0][i] << 4) | buf[1][i];
*dst++ = (buf[i] << 4) | buf[n+i];
}
av_free(buf);
} else
for(i=7*avctx->channels; i<avctx->block_align; i++) {
int nibble;
@ -648,18 +672,19 @@ static int adpcm_encode_frame(AVCodecContext *avctx,
case CODEC_ID_ADPCM_YAMAHA:
n = avctx->frame_size / 2;
if(avctx->trellis > 0) {
uint8_t buf[2][n*2];
FF_ALLOC_OR_GOTO(avctx, buf, 2*n*2, error);
n *= 2;
if(avctx->channels == 1) {
adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n);
for(i=0; i<n; i+=2)
*dst++ = buf[0][i] | (buf[0][i+1] << 4);
*dst++ = buf[i] | (buf[i+1] << 4);
} else {
adpcm_compress_trellis(avctx, samples, buf[0], &c->status[0], n);
adpcm_compress_trellis(avctx, samples+1, buf[1], &c->status[1], n);
adpcm_compress_trellis(avctx, samples, buf, &c->status[0], n);
adpcm_compress_trellis(avctx, samples+1, buf+n, &c->status[1], n);
for(i=0; i<n; i++)
*dst++ = buf[0][i] | (buf[1][i] << 4);
*dst++ = buf[i] | (buf[n+i] << 4);
}
av_free(buf);
} else
for (n *= avctx->channels; n>0; n--) {
int nibble;
@ -669,6 +694,7 @@ static int adpcm_encode_frame(AVCodecContext *avctx,
}
break;
default:
error:
return -1;
}
return dst - frame;