* PCM codecs
* Copyright (c) 2001 Fabrice Bellard.
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file pcm.c
+ * PCM codecs
*/
+
#include "avcodec.h"
+#include "bitstream.h" // for ff_reverse
+#include "bytestream.h"
/* from g711.c by SUN microsystems (unrestricted use) */
-#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
-#define QUANT_MASK (0xf) /* Quantization field mask. */
-#define NSEGS (8) /* Number of A-law segments. */
-#define SEG_SHIFT (4) /* Left shift for segment number. */
-#define SEG_MASK (0x70) /* Segment field mask. */
+#define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
+#define QUANT_MASK (0xf) /* Quantization field mask. */
+#define NSEGS (8) /* Number of A-law segments. */
+#define SEG_SHIFT (4) /* Left shift for segment number. */
+#define SEG_MASK (0x70) /* Segment field mask. */
-#define BIAS (0x84) /* Bias for linear code. */
+#define BIAS (0x84) /* Bias for linear code. */
/*
* alaw2linear() - Convert an A-law value to 16-bit linear PCM
*
*/
-static int alaw2linear(unsigned char a_val)
+static int alaw2linear(unsigned char a_val)
{
- int t;
- int seg;
-
- a_val ^= 0x55;
-
- t = (a_val & QUANT_MASK) << 4;
- seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
- switch (seg) {
- case 0:
- t += 8;
- break;
- case 1:
- t += 0x108;
- break;
- default:
- t += 0x108;
- t <<= seg - 1;
- }
- return ((a_val & SIGN_BIT) ? t : -t);
+ int t;
+ int seg;
+
+ a_val ^= 0x55;
+
+ t = a_val & QUANT_MASK;
+ seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
+ if(seg) t= (t + t + 1 + 32) << (seg + 2);
+ else t= (t + t + 1 ) << 3;
+
+ return ((a_val & SIGN_BIT) ? t : -t);
}
-static int ulaw2linear(unsigned char u_val)
+static int ulaw2linear(unsigned char u_val)
{
- int t;
+ int t;
- /* Complement to obtain normal u-law value. */
- u_val = ~u_val;
+ /* Complement to obtain normal u-law value. */
+ u_val = ~u_val;
- /*
- * Extract and bias the quantization bits. Then
- * shift up by the segment number and subtract out the bias.
- */
- t = ((u_val & QUANT_MASK) << 3) + BIAS;
- t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
+ /*
+ * Extract and bias the quantization bits. Then
+ * shift up by the segment number and subtract out the bias.
+ */
+ t = ((u_val & QUANT_MASK) << 3) + BIAS;
+ t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
- return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
+ return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
}
/* 16384 entries per table */
-static UINT8 *linear_to_alaw = NULL;
-static int linear_to_alaw_ref = 0;
-
-static UINT8 *linear_to_ulaw = NULL;
-static int linear_to_ulaw_ref = 0;
+static uint8_t linear_to_alaw[16384];
+static uint8_t linear_to_ulaw[16384];
-static void build_xlaw_table(UINT8 *linear_to_xlaw,
+static void build_xlaw_table(uint8_t *linear_to_xlaw,
int (*xlaw2linear)(unsigned char),
- int mask)
+ int mask)
{
int i, j, v, v1, v2;
avctx->frame_size = 1;
switch(avctx->codec->id) {
case CODEC_ID_PCM_ALAW:
- if (linear_to_alaw_ref == 0) {
- linear_to_alaw = av_malloc(16384);
- if (!linear_to_alaw)
- return -1;
- build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
- }
- linear_to_alaw_ref++;
+ build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
break;
case CODEC_ID_PCM_MULAW:
- if (linear_to_ulaw_ref == 0) {
- linear_to_ulaw = av_malloc(16384);
- if (!linear_to_ulaw)
- return -1;
- build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
- }
- linear_to_ulaw_ref++;
+ build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
+ break;
+ default:
+ break;
+ }
+
+ switch(avctx->codec->id) {
+ case CODEC_ID_PCM_S32LE:
+ case CODEC_ID_PCM_S32BE:
+ case CODEC_ID_PCM_U32LE:
+ case CODEC_ID_PCM_U32BE:
+ avctx->block_align = 4 * avctx->channels;
+ break;
+ case CODEC_ID_PCM_S24LE:
+ case CODEC_ID_PCM_S24BE:
+ case CODEC_ID_PCM_U24LE:
+ case CODEC_ID_PCM_U24BE:
+ case CODEC_ID_PCM_S24DAUD:
+ avctx->block_align = 3 * avctx->channels;
+ break;
+ case CODEC_ID_PCM_S16LE:
+ case CODEC_ID_PCM_S16BE:
+ case CODEC_ID_PCM_U16LE:
+ case CODEC_ID_PCM_U16BE:
+ avctx->block_align = 2 * avctx->channels;
+ break;
+ case CODEC_ID_PCM_S8:
+ case CODEC_ID_PCM_U8:
+ case CODEC_ID_PCM_MULAW:
+ case CODEC_ID_PCM_ALAW:
+ avctx->block_align = avctx->channels;
break;
default:
break;
}
-
+
avctx->coded_frame= avcodec_alloc_frame();
avctx->coded_frame->key_frame= 1;
-
+
return 0;
}
{
av_freep(&avctx->coded_frame);
- switch(avctx->codec->id) {
- case CODEC_ID_PCM_ALAW:
- if (--linear_to_alaw_ref == 0)
- av_free(linear_to_alaw);
- break;
- case CODEC_ID_PCM_MULAW:
- if (--linear_to_ulaw_ref == 0)
- av_free(linear_to_ulaw);
- break;
- default:
- /* nothing to free */
- break;
- }
return 0;
}
+/**
+ * \brief convert samples from 16 bit
+ * \param bps byte per sample for the destination format, must be >= 2
+ * \param le 0 for big-, 1 for little-endian
+ * \param us 0 for signed, 1 for unsigned output
+ * \param samples input samples
+ * \param dst output samples
+ * \param n number of samples in samples buffer.
+ */
+static inline void encode_from16(int bps, int le, int us,
+ short **samples, uint8_t **dst, int n) {
+ int usum = us ? 0x8000 : 0;
+ if (bps > 2)
+ memset(*dst, 0, n * bps);
+ if (le) *dst += bps - 2;
+ for(;n>0;n--) {
+ register int v = *(*samples)++;
+ v += usum;
+ if (le) AV_WL16(*dst, v);
+ else AV_WB16(*dst, v);
+ *dst += bps;
+ }
+ if (le) *dst -= bps - 2;
+}
+
static int pcm_encode_frame(AVCodecContext *avctx,
- unsigned char *frame, int buf_size, void *data)
+ unsigned char *frame, int buf_size, void *data)
{
int n, sample_size, v;
short *samples;
unsigned char *dst;
switch(avctx->codec->id) {
+ case CODEC_ID_PCM_S32LE:
+ case CODEC_ID_PCM_S32BE:
+ case CODEC_ID_PCM_U32LE:
+ case CODEC_ID_PCM_U32BE:
+ sample_size = 4;
+ break;
+ case CODEC_ID_PCM_S24LE:
+ case CODEC_ID_PCM_S24BE:
+ case CODEC_ID_PCM_U24LE:
+ case CODEC_ID_PCM_U24BE:
+ case CODEC_ID_PCM_S24DAUD:
+ sample_size = 3;
+ break;
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_U16LE:
dst = frame;
switch(avctx->codec->id) {
+ case CODEC_ID_PCM_S32LE:
+ encode_from16(4, 1, 0, &samples, &dst, n);
+ break;
+ case CODEC_ID_PCM_S32BE:
+ encode_from16(4, 0, 0, &samples, &dst, n);
+ break;
+ case CODEC_ID_PCM_U32LE:
+ encode_from16(4, 1, 1, &samples, &dst, n);
+ break;
+ case CODEC_ID_PCM_U32BE:
+ encode_from16(4, 0, 1, &samples, &dst, n);
+ break;
+ case CODEC_ID_PCM_S24LE:
+ encode_from16(3, 1, 0, &samples, &dst, n);
+ break;
+ case CODEC_ID_PCM_S24BE:
+ encode_from16(3, 0, 0, &samples, &dst, n);
+ break;
+ case CODEC_ID_PCM_U24LE:
+ encode_from16(3, 1, 1, &samples, &dst, n);
+ break;
+ case CODEC_ID_PCM_U24BE:
+ encode_from16(3, 0, 1, &samples, &dst, n);
+ break;
+ case CODEC_ID_PCM_S24DAUD:
+ for(;n>0;n--) {
+ uint32_t tmp = ff_reverse[*samples >> 8] +
+ (ff_reverse[*samples & 0xff] << 8);
+ tmp <<= 4; // sync flags would go here
+ bytestream_put_be24(&dst, tmp);
+ samples++;
+ }
+ break;
case CODEC_ID_PCM_S16LE:
for(;n>0;n--) {
v = *samples++;
- dst[0] = v & 0xff;
- dst[1] = v >> 8;
- dst += 2;
+ bytestream_put_le16(&dst, v);
}
break;
case CODEC_ID_PCM_S16BE:
for(;n>0;n--) {
v = *samples++;
- dst[0] = v >> 8;
- dst[1] = v;
- dst += 2;
+ bytestream_put_be16(&dst, v);
}
break;
case CODEC_ID_PCM_U16LE:
for(;n>0;n--) {
v = *samples++;
v += 0x8000;
- dst[0] = v & 0xff;
- dst[1] = v >> 8;
- dst += 2;
+ bytestream_put_le16(&dst, v);
}
break;
case CODEC_ID_PCM_U16BE:
for(;n>0;n--) {
v = *samples++;
v += 0x8000;
- dst[0] = v >> 8;
- dst[1] = v;
- dst += 2;
+ bytestream_put_be16(&dst, v);
}
break;
case CODEC_ID_PCM_S8:
for(;n>0;n--) {
v = *samples++;
- dst[0] = v >> 8;
- dst++;
+ *dst++ = v >> 8;
}
break;
case CODEC_ID_PCM_U8:
for(;n>0;n--) {
v = *samples++;
- dst[0] = (v >> 8) + 128;
- dst++;
+ *dst++ = (v >> 8) + 128;
+ }
+ break;
+ case CODEC_ID_PCM_ZORK:
+ for(;n>0;n--) {
+ v= *samples++ >> 8;
+ if(v<0) v = -v;
+ else v+= 128;
+ *dst++ = v;
}
break;
case CODEC_ID_PCM_ALAW:
for(;n>0;n--) {
v = *samples++;
- dst[0] = linear_to_alaw[(v + 32768) >> 2];
- dst++;
+ *dst++ = linear_to_alaw[(v + 32768) >> 2];
}
break;
case CODEC_ID_PCM_MULAW:
for(;n>0;n--) {
v = *samples++;
- dst[0] = linear_to_ulaw[(v + 32768) >> 2];
- dst++;
+ *dst++ = linear_to_ulaw[(v + 32768) >> 2];
}
break;
default:
return 0;
}
+/**
+ * \brief convert samples to 16 bit
+ * \param bps byte per sample for the source format, must be >= 2
+ * \param le 0 for big-, 1 for little-endian
+ * \param us 0 for signed, 1 for unsigned input
+ * \param src input samples
+ * \param samples output samples
+ * \param src_len number of bytes in src
+ */
+static inline void decode_to16(int bps, int le, int us,
+ uint8_t **src, short **samples, int src_len)
+{
+ int usum = us ? -0x8000 : 0;
+ register int n = src_len / bps;
+ if (le) *src += bps - 2;
+ for(;n>0;n--) {
+ register int v;
+ if (le) v = AV_RL16(*src);
+ else v = AV_RB16(*src);
+ v += usum;
+ *(*samples)++ = v;
+ *src += bps;
+ }
+ if (le) *src -= bps - 2;
+}
+
static int pcm_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- UINT8 *buf, int buf_size)
+ void *data, int *data_size,
+ uint8_t *buf, int buf_size)
{
PCMDecode *s = avctx->priv_data;
int n;
short *samples;
- UINT8 *src;
+ uint8_t *src;
samples = data;
src = buf;
+ n= av_get_bits_per_sample(avctx->codec_id)/8;
+ if(n && buf_size % n){
+ av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n");
+ return -1;
+ }
+
+ buf_size= FFMIN(buf_size, *data_size/2);
+ *data_size=0;
+
switch(avctx->codec->id) {
+ case CODEC_ID_PCM_S32LE:
+ decode_to16(4, 1, 0, &src, &samples, buf_size);
+ break;
+ case CODEC_ID_PCM_S32BE:
+ decode_to16(4, 0, 0, &src, &samples, buf_size);
+ break;
+ case CODEC_ID_PCM_U32LE:
+ decode_to16(4, 1, 1, &src, &samples, buf_size);
+ break;
+ case CODEC_ID_PCM_U32BE:
+ decode_to16(4, 0, 1, &src, &samples, buf_size);
+ break;
+ case CODEC_ID_PCM_S24LE:
+ decode_to16(3, 1, 0, &src, &samples, buf_size);
+ break;
+ case CODEC_ID_PCM_S24BE:
+ decode_to16(3, 0, 0, &src, &samples, buf_size);
+ break;
+ case CODEC_ID_PCM_U24LE:
+ decode_to16(3, 1, 1, &src, &samples, buf_size);
+ break;
+ case CODEC_ID_PCM_U24BE:
+ decode_to16(3, 0, 1, &src, &samples, buf_size);
+ break;
+ case CODEC_ID_PCM_S24DAUD:
+ n = buf_size / 3;
+ for(;n>0;n--) {
+ uint32_t v = bytestream_get_be24(&src);
+ v >>= 4; // sync flags are here
+ *samples++ = ff_reverse[(v >> 8) & 0xff] +
+ (ff_reverse[v & 0xff] << 8);
+ }
+ break;
case CODEC_ID_PCM_S16LE:
n = buf_size >> 1;
for(;n>0;n--) {
- *samples++ = src[0] | (src[1] << 8);
- src += 2;
+ *samples++ = bytestream_get_le16(&src);
}
break;
case CODEC_ID_PCM_S16BE:
n = buf_size >> 1;
for(;n>0;n--) {
- *samples++ = (src[0] << 8) | src[1];
- src += 2;
+ *samples++ = bytestream_get_be16(&src);
}
break;
case CODEC_ID_PCM_U16LE:
n = buf_size >> 1;
for(;n>0;n--) {
- *samples++ = (src[0] | (src[1] << 8)) - 0x8000;
- src += 2;
+ *samples++ = bytestream_get_le16(&src) - 0x8000;
}
break;
case CODEC_ID_PCM_U16BE:
n = buf_size >> 1;
for(;n>0;n--) {
- *samples++ = ((src[0] << 8) | src[1]) - 0x8000;
- src += 2;
+ *samples++ = bytestream_get_be16(&src) - 0x8000;
}
break;
case CODEC_ID_PCM_S8:
n = buf_size;
for(;n>0;n--) {
- *samples++ = src[0] << 8;
- src++;
+ *samples++ = *src++ << 8;
}
break;
case CODEC_ID_PCM_U8:
n = buf_size;
for(;n>0;n--) {
- *samples++ = ((int)src[0] - 128) << 8;
- src++;
+ *samples++ = ((int)*src++ - 128) << 8;
+ }
+ break;
+ case CODEC_ID_PCM_ZORK:
+ n = buf_size;
+ for(;n>0;n--) {
+ int x= *src++;
+ if(x&128) x-= 128;
+ else x = -x;
+ *samples++ = x << 8;
}
break;
case CODEC_ID_PCM_ALAW:
case CODEC_ID_PCM_MULAW:
n = buf_size;
for(;n>0;n--) {
- *samples++ = s->table[src[0]];
- src++;
+ *samples++ = s->table[*src++];
}
break;
default:
- *data_size = 0;
return -1;
}
- *data_size = (UINT8 *)samples - (UINT8 *)data;
+ *data_size = (uint8_t *)samples - (uint8_t *)data;
return src - buf;
}
CODEC_TYPE_AUDIO, \
id, \
0, \
- pcm_encode_init, \
- pcm_encode_frame, \
- pcm_encode_close, \
+ pcm_encode_init, \
+ pcm_encode_frame, \
+ pcm_encode_close, \
NULL, \
}; \
AVCodec name ## _decoder = { \
CODEC_TYPE_AUDIO, \
id, \
sizeof(PCMDecode), \
- pcm_decode_init, \
+ pcm_decode_init, \
NULL, \
NULL, \
pcm_decode_frame, \
-};
+}
+PCM_CODEC(CODEC_ID_PCM_S32LE, pcm_s32le);
+PCM_CODEC(CODEC_ID_PCM_S32BE, pcm_s32be);
+PCM_CODEC(CODEC_ID_PCM_U32LE, pcm_u32le);
+PCM_CODEC(CODEC_ID_PCM_U32BE, pcm_u32be);
+PCM_CODEC(CODEC_ID_PCM_S24LE, pcm_s24le);
+PCM_CODEC(CODEC_ID_PCM_S24BE, pcm_s24be);
+PCM_CODEC(CODEC_ID_PCM_U24LE, pcm_u24le);
+PCM_CODEC(CODEC_ID_PCM_U24BE, pcm_u24be);
+PCM_CODEC(CODEC_ID_PCM_S24DAUD, pcm_s24daud);
PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);
+PCM_CODEC(CODEC_ID_PCM_ZORK, pcm_zork);
#undef PCM_CODEC
projects / ffmpeg / blobdiff