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
30 /* from g711.c by SUN microsystems (unrestricted use) */
32 #define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
33 #define QUANT_MASK (0xf) /* Quantization field mask. */
34 #define NSEGS (8) /* Number of A-law segments. */
35 #define SEG_SHIFT (4) /* Left shift for segment number. */
36 #define SEG_MASK (0x70) /* Segment field mask. */
38 #define BIAS (0x84) /* Bias for linear code. */
41 * alaw2linear() - Convert an A-law value to 16-bit linear PCM
44 static int alaw2linear(unsigned char a_val)
51 t = a_val & QUANT_MASK;
52 seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
53 if(seg) t= (t + t + 1 + 32) << (seg + 2);
54 else t= (t + t + 1 ) << 3;
56 return ((a_val & SIGN_BIT) ? t : -t);
59 static int ulaw2linear(unsigned char u_val)
63 /* Complement to obtain normal u-law value. */
67 * Extract and bias the quantization bits. Then
68 * shift up by the segment number and subtract out the bias.
70 t = ((u_val & QUANT_MASK) << 3) + BIAS;
71 t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
73 return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
76 /* 16384 entries per table */
77 static uint8_t linear_to_alaw[16384];
78 static uint8_t linear_to_ulaw[16384];
80 static void build_xlaw_table(uint8_t *linear_to_xlaw,
81 int (*xlaw2linear)(unsigned char),
89 v1 = xlaw2linear(i ^ mask);
90 v2 = xlaw2linear((i + 1) ^ mask);
91 v = (v1 + v2 + 4) >> 3;
96 linear_to_xlaw[8192 + j] = (i ^ mask);
98 linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80));
101 linear_to_xlaw[0] = linear_to_xlaw[1];
104 static int pcm_encode_init(AVCodecContext *avctx)
106 avctx->frame_size = 1;
107 switch(avctx->codec->id) {
108 case CODEC_ID_PCM_ALAW:
109 build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
111 case CODEC_ID_PCM_MULAW:
112 build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
118 switch(avctx->codec->id) {
119 case CODEC_ID_PCM_S32LE:
120 case CODEC_ID_PCM_S32BE:
121 case CODEC_ID_PCM_U32LE:
122 case CODEC_ID_PCM_U32BE:
123 avctx->block_align = 4 * avctx->channels;
125 case CODEC_ID_PCM_S24LE:
126 case CODEC_ID_PCM_S24BE:
127 case CODEC_ID_PCM_U24LE:
128 case CODEC_ID_PCM_U24BE:
129 case CODEC_ID_PCM_S24DAUD:
130 avctx->block_align = 3 * avctx->channels;
132 case CODEC_ID_PCM_S16LE:
133 case CODEC_ID_PCM_S16BE:
134 case CODEC_ID_PCM_U16LE:
135 case CODEC_ID_PCM_U16BE:
136 avctx->block_align = 2 * avctx->channels;
138 case CODEC_ID_PCM_S8:
139 case CODEC_ID_PCM_U8:
140 case CODEC_ID_PCM_MULAW:
141 case CODEC_ID_PCM_ALAW:
142 avctx->block_align = avctx->channels;
148 avctx->coded_frame= avcodec_alloc_frame();
149 avctx->coded_frame->key_frame= 1;
154 static int pcm_encode_close(AVCodecContext *avctx)
156 av_freep(&avctx->coded_frame);
162 * \brief convert samples from 16 bit
163 * \param bps byte per sample for the destination format, must be >= 2
164 * \param le 0 for big-, 1 for little-endian
165 * \param us 0 for signed, 1 for unsigned output
166 * \param samples input samples
167 * \param dst output samples
168 * \param n number of samples in samples buffer.
170 static inline void encode_from16(int bps, int le, int us,
171 short **samples, uint8_t **dst, int n) {
173 memset(*dst, 0, n * bps);
174 if (le) *dst += bps - 2;
176 register int v = *(*samples)++;
182 if (le) *dst -= bps - 2;
185 static int pcm_encode_frame(AVCodecContext *avctx,
186 unsigned char *frame, int buf_size, void *data)
188 int n, sample_size, v;
192 switch(avctx->codec->id) {
193 case CODEC_ID_PCM_S32LE:
194 case CODEC_ID_PCM_S32BE:
195 case CODEC_ID_PCM_U32LE:
196 case CODEC_ID_PCM_U32BE:
199 case CODEC_ID_PCM_S24LE:
200 case CODEC_ID_PCM_S24BE:
201 case CODEC_ID_PCM_U24LE:
202 case CODEC_ID_PCM_U24BE:
203 case CODEC_ID_PCM_S24DAUD:
206 case CODEC_ID_PCM_S16LE:
207 case CODEC_ID_PCM_S16BE:
208 case CODEC_ID_PCM_U16LE:
209 case CODEC_ID_PCM_U16BE:
216 n = buf_size / sample_size;
220 switch(avctx->codec->id) {
221 case CODEC_ID_PCM_S32LE:
222 encode_from16(4, 1, 0, &samples, &dst, n);
224 case CODEC_ID_PCM_S32BE:
225 encode_from16(4, 0, 0, &samples, &dst, n);
227 case CODEC_ID_PCM_U32LE:
228 encode_from16(4, 1, 1, &samples, &dst, n);
230 case CODEC_ID_PCM_U32BE:
231 encode_from16(4, 0, 1, &samples, &dst, n);
233 case CODEC_ID_PCM_S24LE:
234 encode_from16(3, 1, 0, &samples, &dst, n);
236 case CODEC_ID_PCM_S24BE:
237 encode_from16(3, 0, 0, &samples, &dst, n);
239 case CODEC_ID_PCM_U24LE:
240 encode_from16(3, 1, 1, &samples, &dst, n);
242 case CODEC_ID_PCM_U24BE:
243 encode_from16(3, 0, 1, &samples, &dst, n);
245 case CODEC_ID_PCM_S24DAUD:
247 uint32_t tmp = ff_reverse[*samples >> 8] +
248 (ff_reverse[*samples & 0xff] << 8);
249 tmp <<= 4; // sync flags would go here
258 case CODEC_ID_PCM_S16LE:
266 case CODEC_ID_PCM_S16BE:
274 case CODEC_ID_PCM_U16LE:
283 case CODEC_ID_PCM_U16BE:
292 case CODEC_ID_PCM_S8:
299 case CODEC_ID_PCM_U8:
302 dst[0] = (v >> 8) + 128;
306 case CODEC_ID_PCM_ALAW:
309 dst[0] = linear_to_alaw[(v + 32768) >> 2];
313 case CODEC_ID_PCM_MULAW:
316 dst[0] = linear_to_ulaw[(v + 32768) >> 2];
323 //avctx->frame_size = (dst - frame) / (sample_size * avctx->channels);
328 typedef struct PCMDecode {
332 static int pcm_decode_init(AVCodecContext * avctx)
334 PCMDecode *s = avctx->priv_data;
337 switch(avctx->codec->id) {
338 case CODEC_ID_PCM_ALAW:
340 s->table[i] = alaw2linear(i);
342 case CODEC_ID_PCM_MULAW:
344 s->table[i] = ulaw2linear(i);
353 * \brief convert samples to 16 bit
354 * \param bps byte per sample for the source format, must be >= 2
355 * \param le 0 for big-, 1 for little-endian
356 * \param us 0 for signed, 1 for unsigned input
357 * \param src input samples
358 * \param samples output samples
359 * \param src_len number of bytes in src
361 static inline void decode_to16(int bps, int le, int us,
362 uint8_t **src, short **samples, int src_len)
364 register int n = src_len / bps;
365 if (le) *src += bps - 2;
367 *(*samples)++ = ((*src)[le] << 8 | (*src)[1 - le]) - (us?0x8000:0);
370 if (le) *src -= bps - 2;
373 static int pcm_decode_frame(AVCodecContext *avctx,
374 void *data, int *data_size,
375 uint8_t *buf, int buf_size)
377 PCMDecode *s = avctx->priv_data;
385 n= av_get_bits_per_sample(avctx->codec_id)/8;
386 if(n && buf_size % n){
387 av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n");
391 buf_size= FFMIN(buf_size, *data_size/2);
394 switch(avctx->codec->id) {
395 case CODEC_ID_PCM_S32LE:
396 decode_to16(4, 1, 0, &src, &samples, buf_size);
398 case CODEC_ID_PCM_S32BE:
399 decode_to16(4, 0, 0, &src, &samples, buf_size);
401 case CODEC_ID_PCM_U32LE:
402 decode_to16(4, 1, 1, &src, &samples, buf_size);
404 case CODEC_ID_PCM_U32BE:
405 decode_to16(4, 0, 1, &src, &samples, buf_size);
407 case CODEC_ID_PCM_S24LE:
408 decode_to16(3, 1, 0, &src, &samples, buf_size);
410 case CODEC_ID_PCM_S24BE:
411 decode_to16(3, 0, 0, &src, &samples, buf_size);
413 case CODEC_ID_PCM_U24LE:
414 decode_to16(3, 1, 1, &src, &samples, buf_size);
416 case CODEC_ID_PCM_U24BE:
417 decode_to16(3, 0, 1, &src, &samples, buf_size);
419 case CODEC_ID_PCM_S24DAUD:
422 uint32_t v = src[0] << 16 | src[1] << 8 | src[2];
423 v >>= 4; // sync flags are here
424 *samples++ = ff_reverse[(v >> 8) & 0xff] +
425 (ff_reverse[v & 0xff] << 8);
429 case CODEC_ID_PCM_S16LE:
432 *samples++ = src[0] | (src[1] << 8);
436 case CODEC_ID_PCM_S16BE:
439 *samples++ = (src[0] << 8) | src[1];
443 case CODEC_ID_PCM_U16LE:
446 *samples++ = (src[0] | (src[1] << 8)) - 0x8000;
450 case CODEC_ID_PCM_U16BE:
453 *samples++ = ((src[0] << 8) | src[1]) - 0x8000;
457 case CODEC_ID_PCM_S8:
460 *samples++ = src[0] << 8;
464 case CODEC_ID_PCM_U8:
467 *samples++ = ((int)src[0] - 128) << 8;
471 case CODEC_ID_PCM_ALAW:
472 case CODEC_ID_PCM_MULAW:
475 *samples++ = s->table[src[0]];
482 *data_size = (uint8_t *)samples - (uint8_t *)data;
486 #define PCM_CODEC(id, name) \
487 AVCodec name ## _encoder = { \
497 AVCodec name ## _decoder = { \
508 PCM_CODEC(CODEC_ID_PCM_S32LE, pcm_s32le);
509 PCM_CODEC(CODEC_ID_PCM_S32BE, pcm_s32be);
510 PCM_CODEC(CODEC_ID_PCM_U32LE, pcm_u32le);
511 PCM_CODEC(CODEC_ID_PCM_U32BE, pcm_u32be);
512 PCM_CODEC(CODEC_ID_PCM_S24LE, pcm_s24le);
513 PCM_CODEC(CODEC_ID_PCM_S24BE, pcm_s24be);
514 PCM_CODEC(CODEC_ID_PCM_U24LE, pcm_u24le);
515 PCM_CODEC(CODEC_ID_PCM_U24BE, pcm_u24be);
516 PCM_CODEC(CODEC_ID_PCM_S24DAUD, pcm_s24daud);
517 PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
518 PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
519 PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
520 PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
521 PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
522 PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
523 PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
524 PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);