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Code Issues Releases Activity

mpc7: use av_fast_padded_malloc()

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Avoids doing malloc/free for each frame.
Also fixes valgrind errors due to use of uninitialized padding bytes.

Based on a patch by Reimar Döffinger <Reimar.Doeffinger@gmx.de>
This commit is contained in:
Justin Ruggles 2012-01-31 11:17:04 -05:00
parent b5b825c381
commit 83ce51cc7d
1 changed files with 13 additions and 7 deletions
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20
libavcodec/mpc7.c
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@ -203,7 +203,6 @@ static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
int buf_size;
MPCContext *c = avctx->priv_data;
GetBitContext gb;
uint8_t *bits;
int i, ch;
int mb = -1;
Band *bands = c->bands;
@ -235,11 +234,11 @@ static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
return ret;
}
bits = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!bits)
av_fast_padded_malloc(&c->bits, &c->buf_size, buf_size);
if (!c->bits)
return AVERROR(ENOMEM);
c->dsp.bswap_buf((uint32_t *)bits, (const uint32_t *)buf, buf_size >> 2);
init_get_bits(&gb, bits, buf_size * 8);
c->dsp.bswap_buf((uint32_t *)c->bits, (const uint32_t *)buf, buf_size >> 2);
init_get_bits(&gb, c->bits, buf_size * 8);
skip_bits_long(&gb, skip);
/* read subband indexes */
@ -296,8 +295,6 @@ static int mpc7_decode_frame(AVCodecContext * avctx, void *data,
ff_mpc_dequantize_and_synth(c, mb, c->frame.data[0], 2);
av_free(bits);
bits_used = get_bits_count(&gb);
bits_avail = buf_size * 8;
if (!last_frame && ((bits_avail < bits_used) || (bits_used + 32 <= bits_avail))) {
@ -324,12 +321,21 @@ static void mpc7_decode_flush(AVCodecContext *avctx)
c->frames_to_skip = 32;
}
static av_cold int mpc7_decode_close(AVCodecContext *avctx)
{
MPCContext *c = avctx->priv_data;
av_freep(&c->bits);
c->buf_size = 0;
return 0;
}
AVCodec ff_mpc7_decoder = {
.name = "mpc7",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_MUSEPACK7,
.priv_data_size = sizeof(MPCContext),
.init = mpc7_decode_init,
.close = mpc7_decode_close,
.decode = mpc7_decode_frame,
.flush = mpc7_decode_flush,
.capabilities = CODEC_CAP_DR1,