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 #define MAX_CHANNELS 64
33 /* from g711.c by SUN microsystems (unrestricted use) */
35 #define SIGN_BIT (0x80) /* Sign bit for a A-law byte. */
36 #define QUANT_MASK (0xf) /* Quantization field mask. */
37 #define NSEGS (8) /* Number of A-law segments. */
38 #define SEG_SHIFT (4) /* Left shift for segment number. */
39 #define SEG_MASK (0x70) /* Segment field mask. */
41 #define BIAS (0x84) /* Bias for linear code. */
44 * alaw2linear() - Convert an A-law value to 16-bit linear PCM
47 static int alaw2linear(unsigned char a_val)
54 t = a_val & QUANT_MASK;
55 seg = ((unsigned)a_val & SEG_MASK) >> SEG_SHIFT;
56 if(seg) t= (t + t + 1 + 32) << (seg + 2);
57 else t= (t + t + 1 ) << 3;
59 return ((a_val & SIGN_BIT) ? t : -t);
62 static int ulaw2linear(unsigned char u_val)
66 /* Complement to obtain normal u-law value. */
70 * Extract and bias the quantization bits. Then
71 * shift up by the segment number and subtract out the bias.
73 t = ((u_val & QUANT_MASK) << 3) + BIAS;
74 t <<= ((unsigned)u_val & SEG_MASK) >> SEG_SHIFT;
76 return ((u_val & SIGN_BIT) ? (BIAS - t) : (t - BIAS));
79 /* 16384 entries per table */
80 static uint8_t linear_to_alaw[16384];
81 static uint8_t linear_to_ulaw[16384];
83 static void build_xlaw_table(uint8_t *linear_to_xlaw,
84 int (*xlaw2linear)(unsigned char),
92 v1 = xlaw2linear(i ^ mask);
93 v2 = xlaw2linear((i + 1) ^ mask);
94 v = (v1 + v2 + 4) >> 3;
99 linear_to_xlaw[8192 + j] = (i ^ mask);
101 linear_to_xlaw[8192 - j] = (i ^ (mask ^ 0x80));
104 linear_to_xlaw[0] = linear_to_xlaw[1];
107 static int pcm_encode_init(AVCodecContext *avctx)
109 avctx->frame_size = 1;
110 switch(avctx->codec->id) {
111 case CODEC_ID_PCM_ALAW:
112 build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
114 case CODEC_ID_PCM_MULAW:
115 build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
121 switch(avctx->codec->id) {
122 case CODEC_ID_PCM_S32LE:
123 case CODEC_ID_PCM_S32BE:
124 case CODEC_ID_PCM_U32LE:
125 case CODEC_ID_PCM_U32BE:
126 avctx->block_align = 4 * avctx->channels;
128 case CODEC_ID_PCM_S24LE:
129 case CODEC_ID_PCM_S24BE:
130 case CODEC_ID_PCM_U24LE:
131 case CODEC_ID_PCM_U24BE:
132 case CODEC_ID_PCM_S24DAUD:
133 avctx->block_align = 3 * avctx->channels;
135 case CODEC_ID_PCM_S16LE:
136 case CODEC_ID_PCM_S16BE:
137 case CODEC_ID_PCM_U16LE:
138 case CODEC_ID_PCM_U16BE:
139 avctx->block_align = 2 * avctx->channels;
141 case CODEC_ID_PCM_S8:
142 case CODEC_ID_PCM_U8:
143 case CODEC_ID_PCM_MULAW:
144 case CODEC_ID_PCM_ALAW:
145 avctx->block_align = avctx->channels;
151 avctx->coded_frame= avcodec_alloc_frame();
152 avctx->coded_frame->key_frame= 1;
157 static int pcm_encode_close(AVCodecContext *avctx)
159 av_freep(&avctx->coded_frame);
165 * \brief convert samples from 16 bit
166 * \param bps byte per sample for the destination format, must be >= 2
167 * \param le 0 for big-, 1 for little-endian
168 * \param us 0 for signed, 1 for unsigned output
169 * \param samples input samples
170 * \param dst output samples
171 * \param n number of samples in samples buffer.
173 static inline void encode_from16(int bps, int le, int us,
174 short **samples, uint8_t **dst, int n) {
175 int usum = us ? 0x8000 : 0;
177 memset(*dst, 0, n * bps);
178 if (le) *dst += bps - 2;
180 register int v = *(*samples)++;
182 if (le) AV_WL16(*dst, v);
183 else AV_WB16(*dst, v);
186 if (le) *dst -= bps - 2;
189 static int pcm_encode_frame(AVCodecContext *avctx,
190 unsigned char *frame, int buf_size, void *data)
192 int n, sample_size, v;
196 switch(avctx->codec->id) {
197 case CODEC_ID_PCM_S32LE:
198 case CODEC_ID_PCM_S32BE:
199 case CODEC_ID_PCM_U32LE:
200 case CODEC_ID_PCM_U32BE:
203 case CODEC_ID_PCM_S24LE:
204 case CODEC_ID_PCM_S24BE:
205 case CODEC_ID_PCM_U24LE:
206 case CODEC_ID_PCM_U24BE:
207 case CODEC_ID_PCM_S24DAUD:
210 case CODEC_ID_PCM_S16LE:
211 case CODEC_ID_PCM_S16BE:
212 case CODEC_ID_PCM_U16LE:
213 case CODEC_ID_PCM_U16BE:
220 n = buf_size / sample_size;
224 switch(avctx->codec->id) {
225 case CODEC_ID_PCM_S32LE:
226 encode_from16(4, 1, 0, &samples, &dst, n);
228 case CODEC_ID_PCM_S32BE:
229 encode_from16(4, 0, 0, &samples, &dst, n);
231 case CODEC_ID_PCM_U32LE:
232 encode_from16(4, 1, 1, &samples, &dst, n);
234 case CODEC_ID_PCM_U32BE:
235 encode_from16(4, 0, 1, &samples, &dst, n);
237 case CODEC_ID_PCM_S24LE:
238 encode_from16(3, 1, 0, &samples, &dst, n);
240 case CODEC_ID_PCM_S24BE:
241 encode_from16(3, 0, 0, &samples, &dst, n);
243 case CODEC_ID_PCM_U24LE:
244 encode_from16(3, 1, 1, &samples, &dst, n);
246 case CODEC_ID_PCM_U24BE:
247 encode_from16(3, 0, 1, &samples, &dst, n);
249 case CODEC_ID_PCM_S24DAUD:
251 uint32_t tmp = ff_reverse[*samples >> 8] +
252 (ff_reverse[*samples & 0xff] << 8);
253 tmp <<= 4; // sync flags would go here
254 bytestream_put_be24(&dst, tmp);
258 case CODEC_ID_PCM_S16LE:
261 bytestream_put_le16(&dst, v);
264 case CODEC_ID_PCM_S16BE:
267 bytestream_put_be16(&dst, v);
270 case CODEC_ID_PCM_U16LE:
274 bytestream_put_le16(&dst, v);
277 case CODEC_ID_PCM_U16BE:
281 bytestream_put_be16(&dst, v);
284 case CODEC_ID_PCM_S8:
290 case CODEC_ID_PCM_U8:
293 *dst++ = (v >> 8) + 128;
296 case CODEC_ID_PCM_ZORK:
304 case CODEC_ID_PCM_ALAW:
307 *dst++ = linear_to_alaw[(v + 32768) >> 2];
310 case CODEC_ID_PCM_MULAW:
313 *dst++ = linear_to_ulaw[(v + 32768) >> 2];
319 //avctx->frame_size = (dst - frame) / (sample_size * avctx->channels);
324 typedef struct PCMDecode {
328 static int pcm_decode_init(AVCodecContext * avctx)
330 PCMDecode *s = avctx->priv_data;
333 switch(avctx->codec->id) {
334 case CODEC_ID_PCM_ALAW:
336 s->table[i] = alaw2linear(i);
338 case CODEC_ID_PCM_MULAW:
340 s->table[i] = ulaw2linear(i);
349 * \brief convert samples to 16 bit
350 * \param bps byte per sample for the source format, must be >= 2
351 * \param le 0 for big-, 1 for little-endian
352 * \param us 0 for signed, 1 for unsigned input
353 * \param src input samples
354 * \param samples output samples
355 * \param src_len number of bytes in src
357 static inline void decode_to16(int bps, int le, int us,
358 const uint8_t **src, short **samples, int src_len)
360 int usum = us ? -0x8000 : 0;
361 register int n = src_len / bps;
362 if (le) *src += bps - 2;
365 if (le) v = AV_RL16(*src);
366 else v = AV_RB16(*src);
371 if (le) *src -= bps - 2;
374 static int pcm_decode_frame(AVCodecContext *avctx,
375 void *data, int *data_size,
376 const uint8_t *buf, int buf_size)
378 PCMDecode *s = avctx->priv_data;
381 const uint8_t *src, *src2[MAX_CHANNELS];
386 n= av_get_bits_per_sample(avctx->codec_id)/8;
387 if(n && buf_size % n){
388 av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n");
391 if(avctx->channels <= 0 || avctx->channels > MAX_CHANNELS){
392 av_log(avctx, AV_LOG_ERROR, "PCM channels out of bounds\n");
396 buf_size= FFMIN(buf_size, *data_size/2);
399 n = buf_size/avctx->channels;
400 for(c=0;c<avctx->channels;c++)
403 switch(avctx->codec->id) {
404 case CODEC_ID_PCM_S32LE:
405 decode_to16(4, 1, 0, &src, &samples, buf_size);
407 case CODEC_ID_PCM_S32BE:
408 decode_to16(4, 0, 0, &src, &samples, buf_size);
410 case CODEC_ID_PCM_U32LE:
411 decode_to16(4, 1, 1, &src, &samples, buf_size);
413 case CODEC_ID_PCM_U32BE:
414 decode_to16(4, 0, 1, &src, &samples, buf_size);
416 case CODEC_ID_PCM_S24LE:
417 decode_to16(3, 1, 0, &src, &samples, buf_size);
419 case CODEC_ID_PCM_S24BE:
420 decode_to16(3, 0, 0, &src, &samples, buf_size);
422 case CODEC_ID_PCM_U24LE:
423 decode_to16(3, 1, 1, &src, &samples, buf_size);
425 case CODEC_ID_PCM_U24BE:
426 decode_to16(3, 0, 1, &src, &samples, buf_size);
428 case CODEC_ID_PCM_S24DAUD:
431 uint32_t v = bytestream_get_be24(&src);
432 v >>= 4; // sync flags are here
433 *samples++ = ff_reverse[(v >> 8) & 0xff] +
434 (ff_reverse[v & 0xff] << 8);
437 case CODEC_ID_PCM_S16LE:
440 *samples++ = bytestream_get_le16(&src);
443 case CODEC_ID_PCM_S16LE_PLANAR:
445 for(c=0;c<avctx->channels;c++)
446 *samples++ = bytestream_get_le16(&src2[c]);
447 src = src2[avctx->channels-1];
449 case CODEC_ID_PCM_S16BE:
452 *samples++ = bytestream_get_be16(&src);
455 case CODEC_ID_PCM_U16LE:
458 *samples++ = bytestream_get_le16(&src) - 0x8000;
461 case CODEC_ID_PCM_U16BE:
464 *samples++ = bytestream_get_be16(&src) - 0x8000;
467 case CODEC_ID_PCM_S8:
470 *samples++ = *src++ << 8;
473 case CODEC_ID_PCM_U8:
476 *samples++ = ((int)*src++ - 128) << 8;
479 case CODEC_ID_PCM_ZORK:
488 case CODEC_ID_PCM_ALAW:
489 case CODEC_ID_PCM_MULAW:
492 *samples++ = s->table[*src++];
498 *data_size = (uint8_t *)samples - (uint8_t *)data;
502 #ifdef CONFIG_ENCODERS
503 #define PCM_ENCODER(id,name) \
504 AVCodec name ## _encoder = { \
515 #define PCM_ENCODER(id,name)
518 #ifdef CONFIG_DECODERS
519 #define PCM_DECODER(id,name) \
520 AVCodec name ## _decoder = { \
531 #define PCM_DECODER(id,name)
534 #define PCM_CODEC(id, name) \
535 PCM_ENCODER(id,name) PCM_DECODER(id,name)
537 PCM_CODEC (CODEC_ID_PCM_S32LE, pcm_s32le);
538 PCM_CODEC (CODEC_ID_PCM_S32BE, pcm_s32be);
539 PCM_CODEC (CODEC_ID_PCM_U32LE, pcm_u32le);
540 PCM_CODEC (CODEC_ID_PCM_U32BE, pcm_u32be);
541 PCM_CODEC (CODEC_ID_PCM_S24LE, pcm_s24le);
542 PCM_CODEC (CODEC_ID_PCM_S24BE, pcm_s24be);
543 PCM_CODEC (CODEC_ID_PCM_U24LE, pcm_u24le);
544 PCM_CODEC (CODEC_ID_PCM_U24BE, pcm_u24be);
545 PCM_CODEC (CODEC_ID_PCM_S24DAUD, pcm_s24daud);
546 PCM_CODEC (CODEC_ID_PCM_S16LE, pcm_s16le);
547 PCM_DECODER(CODEC_ID_PCM_S16LE_PLANAR, pcm_s16le_planar);
548 PCM_CODEC (CODEC_ID_PCM_S16BE, pcm_s16be);
549 PCM_CODEC (CODEC_ID_PCM_U16LE, pcm_u16le);
550 PCM_CODEC (CODEC_ID_PCM_U16BE, pcm_u16be);
551 PCM_CODEC (CODEC_ID_PCM_S8, pcm_s8);
552 PCM_CODEC (CODEC_ID_PCM_U8, pcm_u8);
553 PCM_CODEC (CODEC_ID_PCM_ALAW, pcm_alaw);
554 PCM_CODEC (CODEC_ID_PCM_MULAW, pcm_mulaw);
555 PCM_CODEC (CODEC_ID_PCM_ZORK, pcm_zork);