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adxenc: use bytestream functions for header writing.

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also add more documentation about the header structure
This commit is contained in:
Justin Ruggles 2011-12-19 10:51:03 -05:00
parent 656e606cae
commit 1fb47728cd
1 changed files with 20 additions and 11 deletions
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31
libavcodec/adxenc.c
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@ -19,9 +19,9 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "adx.h"
#include "bytestream.h"
#include "put_bits.h"
/**
@ -81,20 +81,29 @@ static void adx_encode(ADXContext *c, uint8_t *adx, const int16_t *wav,
flush_put_bits(&pb);
}
#define HEADER_SIZE 36
static int adx_encode_header(AVCodecContext *avctx, uint8_t *buf, int bufsize)
{
ADXContext *c = avctx->priv_data;
AV_WB32(buf + 0x00, 0x80000000 | 0x20);
AV_WB32(buf + 0x04, 0x03120400 | avctx->channels);
AV_WB32(buf + 0x08, avctx->sample_rate);
AV_WB32(buf + 0x0c, 0);
AV_WB16(buf + 0x10, c->cutoff);
AV_WB32(buf + 0x12, 0x03000000);
AV_WB32(buf + 0x16, 0x00000000);
AV_WB32(buf + 0x1a, 0x00000000);
memcpy (buf + 0x1e, "(c)CRI", 6);
return 0x20 + 4;
bytestream_put_be16(&buf, 0x8000); /* header signature */
bytestream_put_be16(&buf, HEADER_SIZE - 4); /* copyright offset */
bytestream_put_byte(&buf, 3); /* encoding */
bytestream_put_byte(&buf, BLOCK_SIZE); /* block size */
bytestream_put_byte(&buf, 4); /* sample size */
bytestream_put_byte(&buf, avctx->channels); /* channels */
bytestream_put_be32(&buf, avctx->sample_rate); /* sample rate */
bytestream_put_be32(&buf, 0); /* total sample count */
bytestream_put_be16(&buf, c->cutoff); /* cutoff frequency */
bytestream_put_byte(&buf, 3); /* version */
bytestream_put_byte(&buf, 0); /* flags */
bytestream_put_be32(&buf, 0); /* unknown */
bytestream_put_be32(&buf, 0); /* loop enabled */
bytestream_put_be16(&buf, 0); /* padding */
bytestream_put_buffer(&buf, "(c)CRI", 6); /* copyright signature */
return HEADER_SIZE;
}
static av_cold int adx_encode_init(AVCodecContext *avctx)