yading@10: /* yading@10: * Assorted DPCM codecs yading@10: * Copyright (c) 2003 The ffmpeg Project yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * Assorted DPCM (differential pulse code modulation) audio codecs yading@10: * by Mike Melanson (melanson@pcisys.net) yading@10: * Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt) yading@10: * for more information on the specific data formats, visit: yading@10: * http://www.pcisys.net/~melanson/codecs/simpleaudio.html yading@10: * SOL DPCMs implemented by Konstantin Shishkov yading@10: * yading@10: * Note about using the Xan DPCM decoder: Xan DPCM is used in AVI files yading@10: * found in the Wing Commander IV computer game. These AVI files contain yading@10: * WAVEFORMAT headers which report the audio format as 0x01: raw PCM. yading@10: * Clearly incorrect. To detect Xan DPCM, you will probably have to yading@10: * special-case your AVI demuxer to use Xan DPCM if the file uses 'Xxan' yading@10: * (Xan video) for its video codec. Alternately, such AVI files also contain yading@10: * the fourcc 'Axan' in the 'auds' chunk of the AVI header. yading@10: */ yading@10: yading@10: #include "libavutil/intreadwrite.h" yading@10: #include "avcodec.h" yading@10: #include "bytestream.h" yading@10: #include "internal.h" yading@10: #include "mathops.h" yading@10: yading@10: typedef struct DPCMContext { yading@10: int16_t roq_square_array[256]; yading@10: int sample[2]; ///< previous sample (for SOL_DPCM) yading@10: const int8_t *sol_table; ///< delta table for SOL_DPCM yading@10: } DPCMContext; yading@10: yading@10: static const int16_t interplay_delta_table[] = { yading@10: 0, 1, 2, 3, 4, 5, 6, 7, yading@10: 8, 9, 10, 11, 12, 13, 14, 15, yading@10: 16, 17, 18, 19, 20, 21, 22, 23, yading@10: 24, 25, 26, 27, 28, 29, 30, 31, yading@10: 32, 33, 34, 35, 36, 37, 38, 39, yading@10: 40, 41, 42, 43, 47, 51, 56, 61, yading@10: 66, 72, 79, 86, 94, 102, 112, 122, yading@10: 133, 145, 158, 173, 189, 206, 225, 245, yading@10: 267, 292, 318, 348, 379, 414, 452, 493, yading@10: 538, 587, 640, 699, 763, 832, 908, 991, yading@10: 1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993, yading@10: 2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008, yading@10: 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, yading@10: 8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206, yading@10: 17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589, yading@10: -29973, -26728, -23186, -19322, -15105, -10503, -5481, -1, yading@10: 1, 1, 5481, 10503, 15105, 19322, 23186, 26728, yading@10: 29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298, yading@10: -17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597, yading@10: -8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772, yading@10: -4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373, yading@10: -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180, yading@10: -1081, -991, -908, -832, -763, -699, -640, -587, yading@10: -538, -493, -452, -414, -379, -348, -318, -292, yading@10: -267, -245, -225, -206, -189, -173, -158, -145, yading@10: -133, -122, -112, -102, -94, -86, -79, -72, yading@10: -66, -61, -56, -51, -47, -43, -42, -41, yading@10: -40, -39, -38, -37, -36, -35, -34, -33, yading@10: -32, -31, -30, -29, -28, -27, -26, -25, yading@10: -24, -23, -22, -21, -20, -19, -18, -17, yading@10: -16, -15, -14, -13, -12, -11, -10, -9, yading@10: -8, -7, -6, -5, -4, -3, -2, -1 yading@10: yading@10: }; yading@10: yading@10: static const int8_t sol_table_old[16] = { yading@10: 0x0, 0x1, 0x2, 0x3, 0x6, 0xA, 0xF, 0x15, yading@10: -0x15, -0xF, -0xA, -0x6, -0x3, -0x2, -0x1, 0x0 yading@10: }; yading@10: yading@10: static const int8_t sol_table_new[16] = { yading@10: 0x0, 0x1, 0x2, 0x3, 0x6, 0xA, 0xF, 0x15, yading@10: 0x0, -0x1, -0x2, -0x3, -0x6, -0xA, -0xF, -0x15 yading@10: }; yading@10: yading@10: static const int16_t sol_table_16[128] = { yading@10: 0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080, yading@10: 0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120, yading@10: 0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0, yading@10: 0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230, yading@10: 0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280, yading@10: 0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0, yading@10: 0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320, yading@10: 0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370, yading@10: 0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0, yading@10: 0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480, yading@10: 0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700, yading@10: 0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00, yading@10: 0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000 yading@10: }; yading@10: yading@10: yading@10: static av_cold int dpcm_decode_init(AVCodecContext *avctx) yading@10: { yading@10: DPCMContext *s = avctx->priv_data; yading@10: int i; yading@10: yading@10: if (avctx->channels < 1 || avctx->channels > 2) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n"); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: yading@10: s->sample[0] = s->sample[1] = 0; yading@10: yading@10: switch(avctx->codec->id) { yading@10: yading@10: case AV_CODEC_ID_ROQ_DPCM: yading@10: /* initialize square table */ yading@10: for (i = 0; i < 128; i++) { yading@10: int16_t square = i * i; yading@10: s->roq_square_array[i ] = square; yading@10: s->roq_square_array[i + 128] = -square; yading@10: } yading@10: break; yading@10: yading@10: case AV_CODEC_ID_SOL_DPCM: yading@10: switch(avctx->codec_tag){ yading@10: case 1: yading@10: s->sol_table = sol_table_old; yading@10: s->sample[0] = s->sample[1] = 0x80; yading@10: break; yading@10: case 2: yading@10: s->sol_table = sol_table_new; yading@10: s->sample[0] = s->sample[1] = 0x80; yading@10: break; yading@10: case 3: yading@10: break; yading@10: default: yading@10: av_log(avctx, AV_LOG_ERROR, "Unknown SOL subcodec\n"); yading@10: return -1; yading@10: } yading@10: break; yading@10: yading@10: default: yading@10: break; yading@10: } yading@10: yading@10: if (avctx->codec->id == AV_CODEC_ID_SOL_DPCM && avctx->codec_tag != 3) yading@10: avctx->sample_fmt = AV_SAMPLE_FMT_U8; yading@10: else yading@10: avctx->sample_fmt = AV_SAMPLE_FMT_S16; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: yading@10: static int dpcm_decode_frame(AVCodecContext *avctx, void *data, yading@10: int *got_frame_ptr, AVPacket *avpkt) yading@10: { yading@10: int buf_size = avpkt->size; yading@10: DPCMContext *s = avctx->priv_data; yading@10: AVFrame *frame = data; yading@10: int out = 0, ret; yading@10: int predictor[2]; yading@10: int ch = 0; yading@10: int stereo = avctx->channels - 1; yading@10: int16_t *output_samples, *samples_end; yading@10: GetByteContext gb; yading@10: yading@10: if (stereo && (buf_size & 1)) yading@10: buf_size--; yading@10: bytestream2_init(&gb, avpkt->data, buf_size); yading@10: yading@10: /* calculate output size */ yading@10: switch(avctx->codec->id) { yading@10: case AV_CODEC_ID_ROQ_DPCM: yading@10: out = buf_size - 8; yading@10: break; yading@10: case AV_CODEC_ID_INTERPLAY_DPCM: yading@10: out = buf_size - 6 - avctx->channels; yading@10: break; yading@10: case AV_CODEC_ID_XAN_DPCM: yading@10: out = buf_size - 2 * avctx->channels; yading@10: break; yading@10: case AV_CODEC_ID_SOL_DPCM: yading@10: if (avctx->codec_tag != 3) yading@10: out = buf_size * 2; yading@10: else yading@10: out = buf_size; yading@10: break; yading@10: } yading@10: if (out <= 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "packet is too small\n"); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: if (out % avctx->channels) { yading@10: av_log(avctx, AV_LOG_WARNING, "channels have differing number of samples\n"); yading@10: } yading@10: yading@10: /* get output buffer */ yading@10: frame->nb_samples = (out + avctx->channels - 1) / avctx->channels; yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: output_samples = (int16_t *)frame->data[0]; yading@10: samples_end = output_samples + out; yading@10: yading@10: switch(avctx->codec->id) { yading@10: yading@10: case AV_CODEC_ID_ROQ_DPCM: yading@10: bytestream2_skipu(&gb, 6); yading@10: yading@10: if (stereo) { yading@10: predictor[1] = sign_extend(bytestream2_get_byteu(&gb) << 8, 16); yading@10: predictor[0] = sign_extend(bytestream2_get_byteu(&gb) << 8, 16); yading@10: } else { yading@10: predictor[0] = sign_extend(bytestream2_get_le16u(&gb), 16); yading@10: } yading@10: yading@10: /* decode the samples */ yading@10: while (output_samples < samples_end) { yading@10: predictor[ch] += s->roq_square_array[bytestream2_get_byteu(&gb)]; yading@10: predictor[ch] = av_clip_int16(predictor[ch]); yading@10: *output_samples++ = predictor[ch]; yading@10: yading@10: /* toggle channel */ yading@10: ch ^= stereo; yading@10: } yading@10: break; yading@10: yading@10: case AV_CODEC_ID_INTERPLAY_DPCM: yading@10: bytestream2_skipu(&gb, 6); /* skip over the stream mask and stream length */ yading@10: yading@10: for (ch = 0; ch < avctx->channels; ch++) { yading@10: predictor[ch] = sign_extend(bytestream2_get_le16u(&gb), 16); yading@10: *output_samples++ = predictor[ch]; yading@10: } yading@10: yading@10: ch = 0; yading@10: while (output_samples < samples_end) { yading@10: predictor[ch] += interplay_delta_table[bytestream2_get_byteu(&gb)]; yading@10: predictor[ch] = av_clip_int16(predictor[ch]); yading@10: *output_samples++ = predictor[ch]; yading@10: yading@10: /* toggle channel */ yading@10: ch ^= stereo; yading@10: } yading@10: break; yading@10: yading@10: case AV_CODEC_ID_XAN_DPCM: yading@10: { yading@10: int shift[2] = { 4, 4 }; yading@10: yading@10: for (ch = 0; ch < avctx->channels; ch++) yading@10: predictor[ch] = sign_extend(bytestream2_get_le16u(&gb), 16); yading@10: yading@10: ch = 0; yading@10: while (output_samples < samples_end) { yading@10: int diff = bytestream2_get_byteu(&gb); yading@10: int n = diff & 3; yading@10: yading@10: if (n == 3) yading@10: shift[ch]++; yading@10: else yading@10: shift[ch] -= (2 * n); yading@10: diff = sign_extend((diff &~ 3) << 8, 16); yading@10: yading@10: /* saturate the shifter to a lower limit of 0 */ yading@10: if (shift[ch] < 0) yading@10: shift[ch] = 0; yading@10: yading@10: diff >>= shift[ch]; yading@10: predictor[ch] += diff; yading@10: yading@10: predictor[ch] = av_clip_int16(predictor[ch]); yading@10: *output_samples++ = predictor[ch]; yading@10: yading@10: /* toggle channel */ yading@10: ch ^= stereo; yading@10: } yading@10: break; yading@10: } yading@10: case AV_CODEC_ID_SOL_DPCM: yading@10: if (avctx->codec_tag != 3) { yading@10: uint8_t *output_samples_u8 = frame->data[0], yading@10: *samples_end_u8 = output_samples_u8 + out; yading@10: while (output_samples_u8 < samples_end_u8) { yading@10: int n = bytestream2_get_byteu(&gb); yading@10: yading@10: s->sample[0] += s->sol_table[n >> 4]; yading@10: s->sample[0] = av_clip_uint8(s->sample[0]); yading@10: *output_samples_u8++ = s->sample[0]; yading@10: yading@10: s->sample[stereo] += s->sol_table[n & 0x0F]; yading@10: s->sample[stereo] = av_clip_uint8(s->sample[stereo]); yading@10: *output_samples_u8++ = s->sample[stereo]; yading@10: } yading@10: } else { yading@10: while (output_samples < samples_end) { yading@10: int n = bytestream2_get_byteu(&gb); yading@10: if (n & 0x80) s->sample[ch] -= sol_table_16[n & 0x7F]; yading@10: else s->sample[ch] += sol_table_16[n & 0x7F]; yading@10: s->sample[ch] = av_clip_int16(s->sample[ch]); yading@10: *output_samples++ = s->sample[ch]; yading@10: /* toggle channel */ yading@10: ch ^= stereo; yading@10: } yading@10: } yading@10: break; yading@10: } yading@10: yading@10: *got_frame_ptr = 1; yading@10: yading@10: return avpkt->size; yading@10: } yading@10: yading@10: #define DPCM_DECODER(id_, name_, long_name_) \ yading@10: AVCodec ff_ ## name_ ## _decoder = { \ yading@10: .name = #name_, \ yading@10: .type = AVMEDIA_TYPE_AUDIO, \ yading@10: .id = id_, \ yading@10: .priv_data_size = sizeof(DPCMContext), \ yading@10: .init = dpcm_decode_init, \ yading@10: .decode = dpcm_decode_frame, \ yading@10: .capabilities = CODEC_CAP_DR1, \ yading@10: .long_name = NULL_IF_CONFIG_SMALL(long_name_), \ yading@10: } yading@10: yading@10: DPCM_DECODER(AV_CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay"); yading@10: DPCM_DECODER(AV_CODEC_ID_ROQ_DPCM, roq_dpcm, "DPCM id RoQ"); yading@10: DPCM_DECODER(AV_CODEC_ID_SOL_DPCM, sol_dpcm, "DPCM Sol"); yading@10: DPCM_DECODER(AV_CODEC_ID_XAN_DPCM, xan_dpcm, "DPCM Xan");