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 av_cold 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 av_cold 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 av_cold 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 av_cold int pcm_encode_init(AVCodecContext *avctx)
109 avctx->frame_size = 1;
110 if (avctx->codec->id==CODEC_ID_PCM_F32BE && avctx->sample_fmt!=SAMPLE_FMT_FLT) {
113 switch(avctx->codec->id) {
114 case CODEC_ID_PCM_ALAW:
115 build_xlaw_table(linear_to_alaw, alaw2linear, 0xd5);
117 case CODEC_ID_PCM_MULAW:
118 build_xlaw_table(linear_to_ulaw, ulaw2linear, 0xff);
124 avctx->block_align = avctx->channels * av_get_bits_per_sample(avctx->codec->id)/8;
125 avctx->coded_frame= avcodec_alloc_frame();
126 avctx->coded_frame->key_frame= 1;
131 static av_cold int pcm_encode_close(AVCodecContext *avctx)
133 av_freep(&avctx->coded_frame);
139 * \brief convert samples from 16 bit
140 * \param bps byte per sample for the destination format, must be >= 2
141 * \param le 0 for big-, 1 for little-endian
142 * \param us 0 for signed, 1 for unsigned output
143 * \param samples input samples
144 * \param dst output samples
145 * \param n number of samples in samples buffer.
147 static inline void encode_from16(int bps, int le, int us,
148 short **samples, uint8_t **dst, int n) {
149 int usum = us ? 0x8000 : 0;
151 memset(*dst, 0, n * bps);
152 if (le) *dst += bps - 2;
154 register int v = *(*samples)++;
156 if (le) AV_WL16(*dst, v);
157 else AV_WB16(*dst, v);
160 if (le) *dst -= bps - 2;
163 static int pcm_encode_frame(AVCodecContext *avctx,
164 unsigned char *frame, int buf_size, void *data)
166 int n, sample_size, v;
170 sample_size = av_get_bits_per_sample(avctx->codec->id)/8;
171 n = buf_size / sample_size;
175 switch(avctx->codec->id) {
176 case CODEC_ID_PCM_F32BE:
178 float *fsamples = data;
180 float fv = *fsamples++;
181 bytestream_put_be32(&dst, av_flt2int(fv));
183 samples = (void*)fsamples;
186 case CODEC_ID_PCM_S32LE:
187 encode_from16(4, 1, 0, &samples, &dst, n);
189 case CODEC_ID_PCM_S32BE:
190 encode_from16(4, 0, 0, &samples, &dst, n);
192 case CODEC_ID_PCM_U32LE:
193 encode_from16(4, 1, 1, &samples, &dst, n);
195 case CODEC_ID_PCM_U32BE:
196 encode_from16(4, 0, 1, &samples, &dst, n);
198 case CODEC_ID_PCM_S24LE:
199 encode_from16(3, 1, 0, &samples, &dst, n);
201 case CODEC_ID_PCM_S24BE:
202 encode_from16(3, 0, 0, &samples, &dst, n);
204 case CODEC_ID_PCM_U24LE:
205 encode_from16(3, 1, 1, &samples, &dst, n);
207 case CODEC_ID_PCM_U24BE:
208 encode_from16(3, 0, 1, &samples, &dst, n);
210 case CODEC_ID_PCM_S24DAUD:
212 uint32_t tmp = ff_reverse[(*samples >> 8) & 0xff] +
213 (ff_reverse[*samples & 0xff] << 8);
214 tmp <<= 4; // sync flags would go here
215 bytestream_put_be24(&dst, tmp);
219 case CODEC_ID_PCM_S16LE:
222 bytestream_put_le16(&dst, v);
225 case CODEC_ID_PCM_S16BE:
228 bytestream_put_be16(&dst, v);
231 case CODEC_ID_PCM_U16LE:
235 bytestream_put_le16(&dst, v);
238 case CODEC_ID_PCM_U16BE:
242 bytestream_put_be16(&dst, v);
245 case CODEC_ID_PCM_S8:
251 case CODEC_ID_PCM_U8:
254 *dst++ = (v >> 8) + 128;
257 case CODEC_ID_PCM_ZORK:
265 case CODEC_ID_PCM_ALAW:
268 *dst++ = linear_to_alaw[(v + 32768) >> 2];
271 case CODEC_ID_PCM_MULAW:
274 *dst++ = linear_to_ulaw[(v + 32768) >> 2];
280 //avctx->frame_size = (dst - frame) / (sample_size * avctx->channels);
285 typedef struct PCMDecode {
289 static av_cold int pcm_decode_init(AVCodecContext * avctx)
291 PCMDecode *s = avctx->priv_data;
294 switch(avctx->codec->id) {
295 case CODEC_ID_PCM_ALAW:
297 s->table[i] = alaw2linear(i);
299 case CODEC_ID_PCM_MULAW:
301 s->table[i] = ulaw2linear(i);
307 avctx->sample_fmt = avctx->codec->sample_fmts[0];
312 * \brief convert samples to 16 bit
313 * \param bps byte per sample for the source format, must be >= 2
314 * \param le 0 for big-, 1 for little-endian
315 * \param us 0 for signed, 1 for unsigned input
316 * \param src input samples
317 * \param samples output samples
318 * \param src_len number of bytes in src
320 static inline void decode_to16(int bps, int le, int us,
321 const uint8_t **src, short **samples, int src_len)
323 int usum = us ? -0x8000 : 0;
324 register int n = src_len / bps;
325 if (le) *src += bps - 2;
328 if (le) v = AV_RL16(*src);
329 else v = AV_RB16(*src);
334 if (le) *src -= bps - 2;
337 static int pcm_decode_frame(AVCodecContext *avctx,
338 void *data, int *data_size,
339 const uint8_t *buf, int buf_size)
341 PCMDecode *s = avctx->priv_data;
342 int sample_size, c, n;
344 const uint8_t *src, *src2[MAX_CHANNELS];
349 if(avctx->channels <= 0 || avctx->channels > MAX_CHANNELS){
350 av_log(avctx, AV_LOG_ERROR, "PCM channels out of bounds\n");
354 sample_size = av_get_bits_per_sample(avctx->codec_id)/8;
356 n = avctx->channels * sample_size;
357 /* av_get_bits_per_sample returns 0 for CODEC_ID_PCM_DVD */
358 if (CODEC_ID_PCM_DVD == avctx->codec_id)
359 /* 2 samples are interleaved per block in PCM_DVD */
360 n = 2 * avctx->channels * avctx->bits_per_sample/8;
362 if(n && buf_size % n){
363 av_log(avctx, AV_LOG_ERROR, "invalid PCM packet\n");
367 buf_size= FFMIN(buf_size, *data_size/2);
370 n = buf_size/sample_size;
372 switch(avctx->codec->id) {
373 case CODEC_ID_PCM_F32BE:
375 float *fsamples = data;
377 *fsamples++ = av_int2flt(bytestream_get_be32(&src));
378 samples = (void*)fsamples;
381 case CODEC_ID_PCM_S32LE:
382 decode_to16(4, 1, 0, &src, &samples, buf_size);
384 case CODEC_ID_PCM_S32BE:
385 decode_to16(4, 0, 0, &src, &samples, buf_size);
387 case CODEC_ID_PCM_U32LE:
388 decode_to16(4, 1, 1, &src, &samples, buf_size);
390 case CODEC_ID_PCM_U32BE:
391 decode_to16(4, 0, 1, &src, &samples, buf_size);
393 case CODEC_ID_PCM_S24LE:
394 decode_to16(3, 1, 0, &src, &samples, buf_size);
396 case CODEC_ID_PCM_S24BE:
397 decode_to16(3, 0, 0, &src, &samples, buf_size);
399 case CODEC_ID_PCM_U24LE:
400 decode_to16(3, 1, 1, &src, &samples, buf_size);
402 case CODEC_ID_PCM_U24BE:
403 decode_to16(3, 0, 1, &src, &samples, buf_size);
405 case CODEC_ID_PCM_S24DAUD:
407 uint32_t v = bytestream_get_be24(&src);
408 v >>= 4; // sync flags are here
409 *samples++ = ff_reverse[(v >> 8) & 0xff] +
410 (ff_reverse[v & 0xff] << 8);
413 case CODEC_ID_PCM_S16LE:
415 *samples++ = bytestream_get_le16(&src);
418 case CODEC_ID_PCM_S16LE_PLANAR:
419 n /= avctx->channels;
420 for(c=0;c<avctx->channels;c++)
423 for(c=0;c<avctx->channels;c++)
424 *samples++ = bytestream_get_le16(&src2[c]);
425 src = src2[avctx->channels-1];
427 case CODEC_ID_PCM_S16BE:
429 *samples++ = bytestream_get_be16(&src);
432 case CODEC_ID_PCM_U16LE:
434 *samples++ = bytestream_get_le16(&src) - 0x8000;
437 case CODEC_ID_PCM_U16BE:
439 *samples++ = bytestream_get_be16(&src) - 0x8000;
442 case CODEC_ID_PCM_S8:
444 *samples++ = *src++ << 8;
447 case CODEC_ID_PCM_U8:
449 *samples++ = ((int)*src++ - 128) << 8;
452 case CODEC_ID_PCM_ZORK:
460 case CODEC_ID_PCM_ALAW:
461 case CODEC_ID_PCM_MULAW:
463 *samples++ = s->table[*src++];
466 case CODEC_ID_PCM_DVD:
467 if(avctx->bits_per_sample != 20 && avctx->bits_per_sample != 24) {
468 av_log(avctx, AV_LOG_ERROR, "PCM DVD unsupported sample depth\n");
471 int jump = avctx->channels * (avctx->bits_per_sample-16) / 4;
472 n = buf_size / (avctx->channels * 2 * avctx->bits_per_sample / 8);
474 for (c=0; c < 2*avctx->channels; c++)
475 *samples++ = bytestream_get_be16(&src);
483 *data_size = (uint8_t *)samples - (uint8_t *)data;
487 #ifdef CONFIG_ENCODERS
488 #define PCM_ENCODER(id,sample_fmt_,name,long_name_) \
489 AVCodec name ## _encoder = { \
498 .sample_fmts = (enum SampleFormat[]){sample_fmt_,SAMPLE_FMT_NONE}, \
499 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
502 #define PCM_ENCODER(id,sample_fmt_,name,long_name_)
505 #ifdef CONFIG_DECODERS
506 #define PCM_DECODER(id,sample_fmt_,name,long_name_) \
507 AVCodec name ## _decoder = { \
516 .sample_fmts = (enum SampleFormat[]){sample_fmt_,SAMPLE_FMT_NONE}, \
517 .long_name = NULL_IF_CONFIG_SMALL(long_name_), \
520 #define PCM_DECODER(id,sample_fmt_,name,long_name_)
523 #define PCM_CODEC(id, sample_fmt_, name, long_name_) \
524 PCM_ENCODER(id,sample_fmt_,name,long_name_) PCM_DECODER(id,sample_fmt_,name,long_name_)
526 /* Note: Do not forget to add new entries to the Makefile as well. */
527 PCM_CODEC (CODEC_ID_PCM_ALAW, SAMPLE_FMT_S16, pcm_alaw, "A-law PCM");
528 PCM_CODEC (CODEC_ID_PCM_DVD, SAMPLE_FMT_S16, pcm_dvd, "signed 16|20|24-bit big-endian PCM");
529 PCM_CODEC (CODEC_ID_PCM_F32BE, SAMPLE_FMT_FLT, pcm_f32be, "32-bit floating point big-endian PCM");
530 PCM_CODEC (CODEC_ID_PCM_MULAW, SAMPLE_FMT_S16, pcm_mulaw, "mu-law PCM");
531 PCM_CODEC (CODEC_ID_PCM_S8, SAMPLE_FMT_S16, pcm_s8, "signed 8-bit PCM");
532 PCM_CODEC (CODEC_ID_PCM_S16BE, SAMPLE_FMT_S16, pcm_s16be, "signed 16-bit big-endian PCM");
533 PCM_CODEC (CODEC_ID_PCM_S16LE, SAMPLE_FMT_S16, pcm_s16le, "signed 16-bit little-endian PCM");
534 PCM_DECODER(CODEC_ID_PCM_S16LE_PLANAR, SAMPLE_FMT_S16, pcm_s16le_planar, "16-bit little-endian planar PCM");
535 PCM_CODEC (CODEC_ID_PCM_S24BE, SAMPLE_FMT_S16, pcm_s24be, "signed 24-bit big-endian PCM");
536 PCM_CODEC (CODEC_ID_PCM_S24DAUD, SAMPLE_FMT_S16, pcm_s24daud, "D-Cinema audio signed 24-bit PCM");
537 PCM_CODEC (CODEC_ID_PCM_S24LE, SAMPLE_FMT_S16, pcm_s24le, "signed 24-bit little-endian PCM");
538 PCM_CODEC (CODEC_ID_PCM_S32BE, SAMPLE_FMT_S16, pcm_s32be, "signed 32-bit big-endian PCM");
539 PCM_CODEC (CODEC_ID_PCM_S32LE, SAMPLE_FMT_S16, pcm_s32le, "signed 32-bit little-endian PCM");
540 PCM_CODEC (CODEC_ID_PCM_U8, SAMPLE_FMT_S16, pcm_u8, "unsigned 8-bit PCM");
541 PCM_CODEC (CODEC_ID_PCM_U16BE, SAMPLE_FMT_S16, pcm_u16be, "unsigned 16-bit big-endian PCM");
542 PCM_CODEC (CODEC_ID_PCM_U16LE, SAMPLE_FMT_S16, pcm_u16le, "unsigned 16-bit little-endian PCM");
543 PCM_CODEC (CODEC_ID_PCM_U24BE, SAMPLE_FMT_S16, pcm_u24be, "unsigned 24-bit big-endian PCM");
544 PCM_CODEC (CODEC_ID_PCM_U24LE, SAMPLE_FMT_S16, pcm_u24le, "unsigned 24-bit little-endian PCM");
545 PCM_CODEC (CODEC_ID_PCM_U32BE, SAMPLE_FMT_S16, pcm_u32be, "unsigned 32-bit big-endian PCM");
546 PCM_CODEC (CODEC_ID_PCM_U32LE, SAMPLE_FMT_S16, pcm_u32le, "unsigned 32-bit little-endian PCM");
547 PCM_CODEC (CODEC_ID_PCM_ZORK, SAMPLE_FMT_S16, pcm_zork, "Zork PCM");