531 lines
18 KiB
C
531 lines
18 KiB
C
/*
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* ADPCM codecs
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* Copyright (c) 2001 Fabrice Bellard.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avcodec.h"
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/*
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* First version by Francois Revol revol@free.fr
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*
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* Features and limitations:
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*
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* Reference documents:
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* http://www.pcisys.net/~melanson/codecs/adpcm.txt
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* http://www.geocities.com/SiliconValley/8682/aud3.txt
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* http://openquicktime.sourceforge.net/plugins.htm
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* XAnim sources (xa_codec.c) http://www.rasnaimaging.com/people/lapus/download.html
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* http://www.cs.ucla.edu/~leec/mediabench/applications.html
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* SoX source code http://home.sprynet.com/~cbagwell/sox.html
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*/
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#define BLKSIZE 1024
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#define CLAMP_TO_SHORT(value) \
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if (value > 32767) \
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value = 32767; \
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else if (value < -32768) \
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value = -32768; \
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/* step_table[] and index_table[] are from the ADPCM reference source */
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/* This is the index table: */
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static int index_table[16] = {
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-1, -1, -1, -1, 2, 4, 6, 8,
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-1, -1, -1, -1, 2, 4, 6, 8,
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};
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/* This is the step table. Note that many programs use slight deviations from
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* this table, but such deviations are negligible:
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*/
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static int step_table[89] = {
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7, 8, 9, 10, 11, 12, 13, 14, 16, 17,
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19, 21, 23, 25, 28, 31, 34, 37, 41, 45,
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50, 55, 60, 66, 73, 80, 88, 97, 107, 118,
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130, 143, 157, 173, 190, 209, 230, 253, 279, 307,
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337, 371, 408, 449, 494, 544, 598, 658, 724, 796,
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876, 963, 1060, 1166, 1282, 1411, 1552, 1707, 1878, 2066,
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2272, 2499, 2749, 3024, 3327, 3660, 4026, 4428, 4871, 5358,
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5894, 6484, 7132, 7845, 8630, 9493, 10442, 11487, 12635, 13899,
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15289, 16818, 18500, 20350, 22385, 24623, 27086, 29794, 32767
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};
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/* Those are for MS-ADPCM */
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/* AdaptationTable[], AdaptCoeff1[], and AdaptCoeff2[] are from libsndfile */
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static int AdaptationTable[] = {
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230, 230, 230, 230, 307, 409, 512, 614,
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768, 614, 512, 409, 307, 230, 230, 230
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};
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static int AdaptCoeff1[] = {
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256, 512, 0, 192, 240, 460, 392
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};
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static int AdaptCoeff2[] = {
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0, -256, 0, 64, 0, -208, -232
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};
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/* end of tables */
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typedef struct ADPCMChannelStatus {
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int predictor;
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short int step_index;
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int step;
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/* for encoding */
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int prev_sample;
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/* MS version */
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short sample1;
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short sample2;
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int coeff1;
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int coeff2;
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int idelta;
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} ADPCMChannelStatus;
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typedef struct ADPCMContext {
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int channel; /* for stereo MOVs, decode left, then decode right, then tell it's decoded */
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ADPCMChannelStatus status[2];
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short sample_buffer[32]; /* hold left samples while waiting for right samples */
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} ADPCMContext;
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/* XXX: implement encoding */
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static int adpcm_encode_init(AVCodecContext *avctx)
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{
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if (avctx->channels > 2)
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return -1; /* only stereo or mono =) */
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switch(avctx->codec->id) {
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case CODEC_ID_ADPCM_IMA_QT:
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fprintf(stderr, "ADPCM: codec admcp_ima_qt unsupported for encoding !\n");
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avctx->frame_size = 64; /* XXX: can multiple of avctx->channels * 64 (left and right blocks are interleaved) */
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return -1;
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break;
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case CODEC_ID_ADPCM_IMA_WAV:
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avctx->frame_size = (BLKSIZE - 4 * avctx->channels) * 8 / (4 * avctx->channels) + 1; /* each 16 bits sample gives one nibble */
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/* and we have 4 bytes per channel overhead */
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avctx->block_align = BLKSIZE;
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/* seems frame_size isn't taken into account... have to buffer the samples :-( */
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break;
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case CODEC_ID_ADPCM_MS:
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fprintf(stderr, "ADPCM: codec admcp_ms unsupported for encoding !\n");
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return -1;
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break;
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default:
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return -1;
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break;
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}
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return 0;
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}
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static int adpcm_encode_close(AVCodecContext *avctx)
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{
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/* nothing to free */
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return 0;
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}
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static inline unsigned char adpcm_ima_compress_sample(ADPCMChannelStatus *c, short sample)
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{
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int step_index;
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unsigned char nibble;
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int sign = 0; /* sign bit of the nibble (MSB) */
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int delta, predicted_delta;
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delta = sample - c->prev_sample;
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if (delta < 0) {
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sign = 1;
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delta = -delta;
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}
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step_index = c->step_index;
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/* nibble = 4 * delta / step_table[step_index]; */
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nibble = (delta << 2) / step_table[step_index];
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if (nibble > 7)
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nibble = 7;
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step_index += index_table[nibble];
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if (step_index < 0)
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step_index = 0;
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if (step_index > 88)
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step_index = 88;
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/* what the decoder will find */
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predicted_delta = ((step_table[step_index] * nibble) / 4) + (step_table[step_index] / 8);
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if (sign)
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c->prev_sample -= predicted_delta;
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else
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c->prev_sample += predicted_delta;
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CLAMP_TO_SHORT(c->prev_sample);
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nibble += sign << 3; /* sign * 8 */
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/* save back */
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c->step_index = step_index;
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return nibble;
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}
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static int adpcm_encode_frame(AVCodecContext *avctx,
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unsigned char *frame, int buf_size, void *data)
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{
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int n;
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short *samples;
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unsigned char *dst;
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ADPCMContext *c = avctx->priv_data;
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dst = frame;
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samples = (short *)data;
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/* n = (BLKSIZE - 4 * avctx->channels) / (2 * 8 * avctx->channels); */
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switch(avctx->codec->id) {
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case CODEC_ID_ADPCM_IMA_QT: /* XXX: can't test until we get .mov writer */
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break;
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case CODEC_ID_ADPCM_IMA_WAV:
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n = avctx->frame_size / 8;
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c->status[0].prev_sample = (signed short)samples[0]; /* XXX */
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/* c->status[0].step_index = 0; *//* XXX: not sure how to init the state machine */
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*dst++ = (c->status[0].prev_sample) & 0xFF; /* little endian */
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*dst++ = (c->status[0].prev_sample >> 8) & 0xFF;
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*dst++ = (unsigned char)c->status[0].step_index;
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*dst++ = 0; /* unknown */
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samples++;
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if (avctx->channels == 2) {
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c->status[1].prev_sample = (signed short)samples[0];
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/* c->status[1].step_index = 0; */
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*dst++ = (c->status[1].prev_sample) & 0xFF;
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*dst++ = (c->status[1].prev_sample >> 8) & 0xFF;
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*dst++ = (unsigned char)c->status[1].step_index;
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*dst++ = 0;
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samples++;
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}
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/* stereo: 4 bytes (8 samples) for left, 4 bytes for right, 4 bytes left, ... */
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for (; n>0; n--) {
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*dst = adpcm_ima_compress_sample(&c->status[0], samples[0]) & 0x0F;
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*dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels]) << 4) & 0xF0;
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dst++;
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*dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 2]) & 0x0F;
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*dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 3]) << 4) & 0xF0;
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dst++;
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*dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 4]) & 0x0F;
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*dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 5]) << 4) & 0xF0;
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dst++;
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*dst = adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 6]) & 0x0F;
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*dst |= (adpcm_ima_compress_sample(&c->status[0], samples[avctx->channels * 7]) << 4) & 0xF0;
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dst++;
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/* right channel */
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if (avctx->channels == 2) {
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*dst = adpcm_ima_compress_sample(&c->status[1], samples[1]);
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*dst |= adpcm_ima_compress_sample(&c->status[1], samples[3]) << 4;
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dst++;
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*dst = adpcm_ima_compress_sample(&c->status[1], samples[5]);
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*dst |= adpcm_ima_compress_sample(&c->status[1], samples[7]) << 4;
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dst++;
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*dst = adpcm_ima_compress_sample(&c->status[1], samples[9]);
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*dst |= adpcm_ima_compress_sample(&c->status[1], samples[11]) << 4;
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dst++;
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*dst = adpcm_ima_compress_sample(&c->status[1], samples[13]);
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*dst |= adpcm_ima_compress_sample(&c->status[1], samples[15]) << 4;
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dst++;
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}
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samples += 8 * avctx->channels;
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}
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break;
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default:
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return -1;
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}
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avctx->key_frame = 1;
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return dst - frame;
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}
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static int adpcm_decode_init(AVCodecContext * avctx)
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{
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ADPCMContext *c = avctx->priv_data;
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c->channel = 0;
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c->status[0].predictor = c->status[1].predictor = 0;
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c->status[0].step_index = c->status[1].step_index = 0;
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c->status[0].step = c->status[1].step = 0;
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switch(avctx->codec->id) {
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default:
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break;
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}
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return 0;
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}
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static inline short adpcm_ima_expand_nibble(ADPCMChannelStatus *c, char nibble)
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{
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int step_index;
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int predictor;
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int sign, delta, diff, step;
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predictor = c->predictor;
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step_index = c->step_index + index_table[(unsigned)nibble];
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if (step_index < 0) step_index = 0;
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if (step_index > 88) step_index = 88;
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step = c->step;
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/*
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diff = ((signed)((nibble & 0x08)?(nibble | 0xF0):(nibble)) + 0.5) * step / 4;
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predictor += diff;
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*/
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sign = nibble & 8;
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delta = nibble & 7;
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diff = step >> 3;
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if (delta & 4) diff += step;
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if (delta & 2) diff += step >> 1;
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if (delta & 1) diff += step >> 2;
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if (sign) predictor -= diff;
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else predictor += diff;
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CLAMP_TO_SHORT(predictor);
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c->predictor = predictor;
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c->step_index = step_index;
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c->step = step_table[step_index];
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return (short)predictor;
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}
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static inline short adpcm_ms_expand_nibble(ADPCMChannelStatus *c, char nibble)
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{
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int predictor;
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predictor = (((c->sample1) * (c->coeff1)) + ((c->sample2) * (c->coeff2))) / 256;
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predictor += (signed)((nibble & 0x08)?(nibble - 0x10):(nibble)) * c->idelta;
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CLAMP_TO_SHORT(predictor);
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c->sample2 = c->sample1;
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c->sample1 = predictor;
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c->idelta = (AdaptationTable[(int)nibble] * c->idelta) / 256;
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if (c->idelta < 16) c->idelta = 16;
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return (short)predictor;
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}
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static int adpcm_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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UINT8 *buf, int buf_size)
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{
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ADPCMContext *c = avctx->priv_data;
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ADPCMChannelStatus *cs;
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int n, m, channel;
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int block_predictor[2];
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short *samples;
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UINT8 *src;
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int st; /* stereo */
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samples = data;
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src = buf;
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st = avctx->channels == 2;
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switch(avctx->codec->id) {
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case CODEC_ID_ADPCM_IMA_QT:
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n = (buf_size - 2);/* >> 2*avctx->channels;*/
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channel = c->channel;
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cs = &(c->status[channel]);
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/* (pppppp) (piiiiiii) */
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/* Bits 15-7 are the _top_ 9 bits of the 16-bit initial predictor value */
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cs->predictor = (*src++) << 8;
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cs->predictor |= (*src & 0x80);
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cs->predictor &= 0xFF80;
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/* sign extension */
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if(cs->predictor & 0x8000)
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cs->predictor -= 0x10000;
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CLAMP_TO_SHORT(cs->predictor);
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cs->step_index = (*src++) & 0x7F;
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if (cs->step_index > 88) fprintf(stderr, "ERROR: step_index = %i\n", cs->step_index);
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if (cs->step_index > 88) cs->step_index = 88;
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cs->step = step_table[cs->step_index];
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if (st && channel)
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samples++;
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*samples++ = cs->predictor;
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samples += st;
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for(m=32; n>0 && m>0; n--, m--) { /* in QuickTime, IMA is encoded by chuncks of 34 bytes (=64 samples) */
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*samples = adpcm_ima_expand_nibble(cs, src[0] & 0x0F);
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samples += avctx->channels;
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*samples = adpcm_ima_expand_nibble(cs, (src[0] >> 4) & 0x0F);
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samples += avctx->channels;
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src ++;
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}
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if(st) { /* handle stereo interlacing */
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c->channel = (channel + 1) % 2; /* we get one packet for left, then one for right data */
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if(channel == 0) { /* wait for the other packet before outputing anything */
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*data_size = 0;
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return src - buf;
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}
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}
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break;
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case CODEC_ID_ADPCM_IMA_WAV:
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if (buf_size > BLKSIZE) {
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if (avctx->block_align != 0)
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buf_size = avctx->block_align;
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else
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buf_size = BLKSIZE;
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}
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n = buf_size - 4 * avctx->channels;
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cs = &(c->status[0]);
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cs->predictor = (*src++) & 0x0FF;
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cs->predictor |= ((*src++) << 8) & 0x0FF00;
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if(cs->predictor & 0x8000)
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cs->predictor -= 0x10000;
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CLAMP_TO_SHORT(cs->predictor);
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*samples++ = cs->predictor;
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cs->step_index = *src++;
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if (cs->step_index < 0) cs->step_index = 0;
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if (cs->step_index > 88) cs->step_index = 88;
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if (*src++) fprintf(stderr, "unused byte should be null !!\n"); /* unused */
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if (st) {
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cs = &(c->status[1]);
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cs->predictor = (*src++) & 0x0FF;
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cs->predictor |= ((*src++) << 8) & 0x0FF00;
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if(cs->predictor & 0x8000)
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cs->predictor -= 0x10000;
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CLAMP_TO_SHORT(cs->predictor);
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*samples++ = cs->predictor;
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cs->step_index = *src++;
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if (cs->step_index < 0) cs->step_index = 0;
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if (cs->step_index > 88) cs->step_index = 88;
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src++; /* unused */
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}
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cs = &(c->status[0]);
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for(m=3; n>0; n--, m--) {
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*samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] & 0x0F);
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if (st)
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*samples++ = adpcm_ima_expand_nibble(&c->status[1], src[4] & 0x0F);
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*samples++ = adpcm_ima_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
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if (st)
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*samples++ = adpcm_ima_expand_nibble(&c->status[1], (src[4] >> 4) & 0x0F);
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src ++;
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if (st && !m) {
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m=3;
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src+=4;
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}
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}
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break;
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case CODEC_ID_ADPCM_MS:
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if (buf_size > BLKSIZE) {
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if (avctx->block_align != 0)
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buf_size = avctx->block_align;
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else
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buf_size = BLKSIZE;
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}
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n = buf_size - 7 * avctx->channels;
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if (n < 0)
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return -1;
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block_predictor[0] = (*src++); /* should be bound */
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block_predictor[0] = (block_predictor[0] < 0)?(0):((block_predictor[0] > 7)?(7):(block_predictor[0]));
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block_predictor[1] = 0;
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if (st)
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block_predictor[1] = (*src++);
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block_predictor[1] = (block_predictor[1] < 0)?(0):((block_predictor[1] > 7)?(7):(block_predictor[1]));
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c->status[0].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
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if (c->status[0].idelta & 0x08000)
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c->status[0].idelta -= 0x10000;
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src+=2;
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if (st)
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c->status[1].idelta = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
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if (st && c->status[1].idelta & 0x08000)
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c->status[1].idelta |= 0xFFFF0000;
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if (st)
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src+=2;
|
|
c->status[0].coeff1 = AdaptCoeff1[block_predictor[0]];
|
|
c->status[0].coeff2 = AdaptCoeff2[block_predictor[0]];
|
|
c->status[1].coeff1 = AdaptCoeff1[block_predictor[1]];
|
|
c->status[1].coeff2 = AdaptCoeff2[block_predictor[1]];
|
|
|
|
c->status[0].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
|
|
src+=2;
|
|
if (st) c->status[1].sample1 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
|
|
if (st) src+=2;
|
|
c->status[0].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
|
|
src+=2;
|
|
if (st) c->status[1].sample2 = ((*src & 0xFF) | ((src[1] << 8) & 0xFF00));
|
|
if (st) src+=2;
|
|
|
|
*samples++ = c->status[0].sample1;
|
|
if (st) *samples++ = c->status[1].sample1;
|
|
*samples++ = c->status[0].sample2;
|
|
if (st) *samples++ = c->status[1].sample2;
|
|
for(;n>0;n--) {
|
|
*samples++ = adpcm_ms_expand_nibble(&c->status[0], (src[0] >> 4) & 0x0F);
|
|
*samples++ = adpcm_ms_expand_nibble(&c->status[st], src[0] & 0x0F);
|
|
src ++;
|
|
}
|
|
break;
|
|
default:
|
|
*data_size = 0;
|
|
return -1;
|
|
}
|
|
*data_size = (UINT8 *)samples - (UINT8 *)data;
|
|
return src - buf;
|
|
}
|
|
|
|
#define ADPCM_CODEC(id, name) \
|
|
AVCodec name ## _encoder = { \
|
|
#name, \
|
|
CODEC_TYPE_AUDIO, \
|
|
id, \
|
|
sizeof(ADPCMContext), \
|
|
adpcm_encode_init, \
|
|
adpcm_encode_frame, \
|
|
adpcm_encode_close, \
|
|
NULL, \
|
|
}; \
|
|
AVCodec name ## _decoder = { \
|
|
#name, \
|
|
CODEC_TYPE_AUDIO, \
|
|
id, \
|
|
sizeof(ADPCMContext), \
|
|
adpcm_decode_init, \
|
|
NULL, \
|
|
NULL, \
|
|
adpcm_decode_frame, \
|
|
};
|
|
|
|
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
|
|
ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
|
|
ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);
|
|
|
|
#undef ADPCM_CODEC
|
|
|