3 * Copyright (c) 2001 Fabrice Bellard.
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 #include "bitstream.h" // for ff_reverse
29 #include "bytestream.h"
31 /* from g711.c by SUN microsystems (unrestricted use) */
33 #define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
34 #define QUANT_MASK (0xf) /* Quantization field mask. */
35 #define NSEGS (8) /* Number of A-law segments. */
36 #define SEG_SHIFT (4) /* Left shift for segment number. */
37 #define SEG_MASK (0x70) /* Segment field mask. */
39 #define BIAS (0x84) /* Bias for linear code. */
42 * alaw2linear() - Convert an A-law value to 16-bit linear PCM
45 static int alaw2linear(unsigned char a_val)
52 t = a_val & QUANT_MASK;
53 seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
54 if(seg) t= (t + t + 1 + 32) << (seg + 2);
55 else t= (t + t + 1 ) << 3;
57 return ((a_val & SIGN_BIT) ? t : -t);
60 static int ulaw2linear(unsigned char u_val)
64 /* Complement to obtain normal u-law value. */
68 * Extract and bias the quantization bits. Then
69 * shift up by the segment number and subtract out the bias.
71 t = ((u_val & QUANT_MASK) << 3) + BIAS;
72 t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
74 return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
77 /* 16384 entries per table */
78 static uint8_t linear_to_alaw[16384];
79 static uint8_t linear_to_ulaw[16384];
81 static void build_xlaw_table(uint8_t *linear_to_xlaw,
82 int (*xlaw2linear)(unsigned char),
90 v1 = xlaw2linear(i ^ mask);
91 v2 = xlaw2linear((i + 1) ^ mask);
92 v = (v1 + v2 + 4) >> 3;
97 linear_to_xlaw[8192 + j] = (i ^ mask);
99 linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80));
102 linear_to_xlaw[0] = linear_to_xlaw[1];
105 static int pcm_encode_init(AVCodecContext *avctx)
107 avctx->frame_size = 1;
108 switch(avctx->codec->id) {
109 case CODEC_ID_PCM_ALAW:
110 build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
112 case CODEC_ID_PCM_MULAW:
113 build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
119 switch(avctx->codec->id) {
120 case CODEC_ID_PCM_S32LE:
121 case CODEC_ID_PCM_S32BE:
122 case CODEC_ID_PCM_U32LE:
123 case CODEC_ID_PCM_U32BE:
124 avctx->block_align = 4 * avctx->channels;
126 case CODEC_ID_PCM_S24LE:
127 case CODEC_ID_PCM_S24BE:
128 case CODEC_ID_PCM_U24LE:
129 case CODEC_ID_PCM_U24BE:
130 case CODEC_ID_PCM_S24DAUD:
131 avctx->block_align = 3 * avctx->channels;
133 case CODEC_ID_PCM_S16LE:
134 case CODEC_ID_PCM_S16BE:
135 case CODEC_ID_PCM_U16LE:
136 case CODEC_ID_PCM_U16BE:
137 avctx->block_align = 2 * avctx->channels;
139 case CODEC_ID_PCM_S8:
140 case CODEC_ID_PCM_U8:
141 case CODEC_ID_PCM_MULAW:
142 case CODEC_ID_PCM_ALAW:
143 avctx->block_align = avctx->channels;
149 avctx->coded_frame= avcodec_alloc_frame();
150 avctx->coded_frame->key_frame= 1;
155 static int pcm_encode_close(AVCodecContext *avctx)
157 av_freep(&avctx->coded_frame);
163 * \brief convert samples from 16 bit
164 * \param bps byte per sample for the destination format, must be >= 2
165 * \param le 0 for big-, 1 for little-endian
166 * \param us 0 for signed, 1 for unsigned output
167 * \param samples input samples
168 * \param dst output samples
169 * \param n number of samples in samples buffer.
171 static inline void encode_from16(int bps, int le, int us,
172 short **samples, uint8_t **dst, int n) {
173 int usum = us ? 0x8000 : 0;
175 memset(*dst, 0, n * bps);
176 if (le) *dst += bps - 2;
178 register int v = *(*samples)++;
180 if (le) {AV_WL16(*dst, v);}
181 else {AV_WB16(*dst, v);}
184 if (le) *dst -= bps - 2;
187 static int pcm_encode_frame(AVCodecContext *avctx,
188 unsigned char *frame, int buf_size, void *data)
190 int n, sample_size, v;
194 switch(avctx->codec->id) {
195 case CODEC_ID_PCM_S32LE:
196 case CODEC_ID_PCM_S32BE:
197 case CODEC_ID_PCM_U32LE:
198 case CODEC_ID_PCM_U32BE:
201 case CODEC_ID_PCM_S24LE:
202 case CODEC_ID_PCM_S24BE:
203 case CODEC_ID_PCM_U24LE:
204 case CODEC_ID_PCM_U24BE:
205 case CODEC_ID_PCM_S24DAUD:
208 case CODEC_ID_PCM_S16LE:
209 case CODEC_ID_PCM_S16BE:
210 case CODEC_ID_PCM_U16LE:
211 case CODEC_ID_PCM_U16BE:
218 n = buf_size / sample_size;
222 switch(avctx->codec->id) {
223 case CODEC_ID_PCM_S32LE:
224 encode_from16(4, 1, 0, &samples, &dst, n);
226 case CODEC_ID_PCM_S32BE:
227 encode_from16(4, 0, 0, &samples, &dst, n);
229 case CODEC_ID_PCM_U32LE:
230 encode_from16(4, 1, 1, &samples, &dst, n);
232 case CODEC_ID_PCM_U32BE:
233 encode_from16(4, 0, 1, &samples, &dst, n);
235 case CODEC_ID_PCM_S24LE:
236 encode_from16(3, 1, 0, &samples, &dst, n);
238 case CODEC_ID_PCM_S24BE:
239 encode_from16(3, 0, 0, &samples, &dst, n);
241 case CODEC_ID_PCM_U24LE:
242 encode_from16(3, 1, 1, &samples, &dst, n);
244 case CODEC_ID_PCM_U24BE:
245 encode_from16(3, 0, 1, &samples, &dst, n);
247 case CODEC_ID_PCM_S24DAUD:
249 uint32_t tmp = ff_reverse[*samples >> 8] +
250 (ff_reverse[*samples & 0xff] << 8);
251 tmp <<= 4; // sync flags would go here
252 bytestream_put_be24(&dst, tmp);
256 case CODEC_ID_PCM_S16LE:
259 bytestream_put_le16(&dst, v);
262 case CODEC_ID_PCM_S16BE:
265 bytestream_put_be16(&dst, v);
268 case CODEC_ID_PCM_U16LE:
272 bytestream_put_le16(&dst, v);
275 case CODEC_ID_PCM_U16BE:
279 bytestream_put_be16(&dst, v);
282 case CODEC_ID_PCM_S8:
288 case CODEC_ID_PCM_U8:
291 *dst++ = (v >> 8) + 128;
294 case CODEC_ID_PCM_ALAW:
297 *dst++ = linear_to_alaw[(v + 32768) >> 2];
300 case CODEC_ID_PCM_MULAW:
303 *dst++ = linear_to_ulaw[(v + 32768) >> 2];
309 //avctx->frame_size = (dst - frame) / (sample_size * avctx->channels);
314 typedef struct PCMDecode {
318 static int pcm_decode_init(AVCodecContext * avctx)
320 PCMDecode *s = avctx->priv_data;
323 switch(avctx->codec->id) {
324 case CODEC_ID_PCM_ALAW:
326 s->table[i] = alaw2linear(i);
328 case CODEC_ID_PCM_MULAW:
330 s->table[i] = ulaw2linear(i);
339 * \brief convert samples to 16 bit
340 * \param bps byte per sample for the source format, must be >= 2
341 * \param le 0 for big-, 1 for little-endian
342 * \param us 0 for signed, 1 for unsigned input
343 * \param src input samples
344 * \param samples output samples
345 * \param src_len number of bytes in src
347 static inline void decode_to16(int bps, int le, int us,
348 uint8_t **src, short **samples, int src_len)
350 int usum = us ? -0x8000 : 0;
351 register int n = src_len / bps;
352 if (le) *src += bps - 2;
355 if (le) v = AV_RL16(*src);
356 else v = AV_RB16(*src);
361 if (le) *src -= bps - 2;
364 static int pcm_decode_frame(AVCodecContext *avctx,
365 void *data, int *data_size,
366 uint8_t *buf, int buf_size)
368 PCMDecode *s = avctx->priv_data;
376 n= av_get_bits_per_sample(avctx->codec_id)/8;
377 if(n && buf_size % n){
378 av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n");
382 buf_size= FFMIN(buf_size, *data_size/2);
385 switch(avctx->codec->id) {
386 case CODEC_ID_PCM_S32LE:
387 decode_to16(4, 1, 0, &src, &samples, buf_size);
389 case CODEC_ID_PCM_S32BE:
390 decode_to16(4, 0, 0, &src, &samples, buf_size);
392 case CODEC_ID_PCM_U32LE:
393 decode_to16(4, 1, 1, &src, &samples, buf_size);
395 case CODEC_ID_PCM_U32BE:
396 decode_to16(4, 0, 1, &src, &samples, buf_size);
398 case CODEC_ID_PCM_S24LE:
399 decode_to16(3, 1, 0, &src, &samples, buf_size);
401 case CODEC_ID_PCM_S24BE:
402 decode_to16(3, 0, 0, &src, &samples, buf_size);
404 case CODEC_ID_PCM_U24LE:
405 decode_to16(3, 1, 1, &src, &samples, buf_size);
407 case CODEC_ID_PCM_U24BE:
408 decode_to16(3, 0, 1, &src, &samples, buf_size);
410 case CODEC_ID_PCM_S24DAUD:
413 uint32_t v = bytestream_get_be24(&src);
414 v >>= 4; // sync flags are here
415 *samples++ = ff_reverse[(v >> 8) & 0xff] +
416 (ff_reverse[v & 0xff] << 8);
419 case CODEC_ID_PCM_S16LE:
422 *samples++ = bytestream_get_le16(&src);
425 case CODEC_ID_PCM_S16BE:
428 *samples++ = bytestream_get_be16(&src);
431 case CODEC_ID_PCM_U16LE:
434 *samples++ = bytestream_get_le16(&src) - 0x8000;
437 case CODEC_ID_PCM_U16BE:
440 *samples++ = bytestream_get_be16(&src) - 0x8000;
443 case CODEC_ID_PCM_S8:
446 *samples++ = *src++ << 8;
449 case CODEC_ID_PCM_U8:
452 *samples++ = ((int)*src++ - 128) << 8;
455 case CODEC_ID_PCM_ALAW:
456 case CODEC_ID_PCM_MULAW:
459 *samples++ = s->table[*src++];
465 *data_size = (uint8_t *)samples - (uint8_t *)data;
469 #define PCM_CODEC(id, name) \
470 AVCodec name ## _encoder = { \
480 AVCodec name ## _decoder = { \
491 PCM_CODEC(CODEC_ID_PCM_S32LE, pcm_s32le);
492 PCM_CODEC(CODEC_ID_PCM_S32BE, pcm_s32be);
493 PCM_CODEC(CODEC_ID_PCM_U32LE, pcm_u32le);
494 PCM_CODEC(CODEC_ID_PCM_U32BE, pcm_u32be);
495 PCM_CODEC(CODEC_ID_PCM_S24LE, pcm_s24le);
496 PCM_CODEC(CODEC_ID_PCM_S24BE, pcm_s24be);
497 PCM_CODEC(CODEC_ID_PCM_U24LE, pcm_u24le);
498 PCM_CODEC(CODEC_ID_PCM_U24BE, pcm_u24be);
499 PCM_CODEC(CODEC_ID_PCM_S24DAUD, pcm_s24daud);
500 PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
501 PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
502 PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
503 PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
504 PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
505 PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
506 PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
507 PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);