From 9aa91043f30cee1419555c0e299c94e655b0930a Mon Sep 17 00:00:00 2001 From: Baptiste Coudurier Date: Tue, 12 Apr 2011 15:29:09 -0700 Subject: Port SMPTE S302M audio decoder from FFmbc 0.3. --- libavcodec/Makefile | 1 + libavcodec/allcodecs.c | 1 + libavcodec/avcodec.h | 1 + libavcodec/s302m.c | 141 +++++++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 144 insertions(+) create mode 100644 libavcodec/s302m.c (limited to 'libavcodec') diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 996b9b4d81..9040b32f57 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -324,6 +324,7 @@ OBJS-$(CONFIG_RV30_DECODER) += rv30.o rv34.o rv30dsp.o \ mpegvideo.o error_resilience.o OBJS-$(CONFIG_RV40_DECODER) += rv40.o rv34.o rv40dsp.o \ mpegvideo.o error_resilience.o +OBJS-$(CONFIG_S302M_DECODER) += s302m.o OBJS-$(CONFIG_SGI_DECODER) += sgidec.o OBJS-$(CONFIG_SGI_ENCODER) += sgienc.o rle.o OBJS-$(CONFIG_SHORTEN_DECODER) += shorten.o diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index 694674ce7b..3466ad94fd 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -177,6 +177,7 @@ void avcodec_register_all(void) REGISTER_ENCDEC (RV20, rv20); REGISTER_DECODER (RV30, rv30); REGISTER_DECODER (RV40, rv40); + REGISTER_DECODER (S302M, s302m); REGISTER_ENCDEC (SGI, sgi); REGISTER_DECODER (SMACKER, smacker); REGISTER_DECODER (SMC, smc); diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h index 876ba8c21b..2eb218ba4f 100644 --- a/libavcodec/avcodec.h +++ b/libavcodec/avcodec.h @@ -232,6 +232,7 @@ enum CodecID { CODEC_ID_PCM_F64LE, CODEC_ID_PCM_BLURAY, CODEC_ID_PCM_LXF, + CODEC_ID_S302M, /* various ADPCM codecs */ CODEC_ID_ADPCM_IMA_QT= 0x11000, diff --git a/libavcodec/s302m.c b/libavcodec/s302m.c new file mode 100644 index 0000000000..fb1fd867d0 --- /dev/null +++ b/libavcodec/s302m.c @@ -0,0 +1,141 @@ +/* + * SMPTE 302M decoder + * Copyright (c) 2008 Laurent Aimar + * Copyright (c) 2009 Baptiste Coudurier + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/intreadwrite.h" +#include "avcodec.h" + +#define AES3_HEADER_LEN 4 + +static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf, + int buf_size) +{ + uint32_t h; + int frame_size, channels, id, bits; + + if (buf_size <= AES3_HEADER_LEN) { + av_log(avctx, AV_LOG_ERROR, "frame is too short\n"); + return AVERROR_INVALIDDATA; + } + + /* + * AES3 header : + * size: 16 + * number channels 2 + * channel_id 8 + * bits per samples 2 + * alignments 4 + */ + + h = AV_RB32(buf); + frame_size = (h >> 16) & 0xffff; + channels = ((h >> 14) & 0x0003) * 2 + 2; + id = (h >> 6) & 0x00ff; + bits = ((h >> 4) & 0x0003) * 4 + 16; + + if (AES3_HEADER_LEN + frame_size != buf_size || bits > 24) { + av_log(avctx, AV_LOG_ERROR, "frame has invalid header\n"); + return AVERROR_INVALIDDATA; + } + + /* Set output properties */ + avctx->bits_per_coded_sample = bits; + if (bits > 16) + avctx->sample_fmt = SAMPLE_FMT_S32; + else + avctx->sample_fmt = SAMPLE_FMT_S16; + + avctx->channels = channels; + avctx->sample_rate = 48000; + avctx->bit_rate = 48000 * avctx->channels * (avctx->bits_per_coded_sample + 4) + + 32 * (48000 / (buf_size * 8 / + (avctx->channels * + (avctx->bits_per_coded_sample + 4)))); + + return frame_size; +} + +static int s302m_decode_frame(AVCodecContext *avctx, void *data, + int *data_size, AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + + int frame_size = s302m_parse_frame_header(avctx, buf, buf_size); + if (frame_size < 0) + return frame_size; + + buf_size -= AES3_HEADER_LEN; + buf += AES3_HEADER_LEN; + + if (*data_size < 4 * buf_size * 8 / (avctx->bits_per_coded_sample + 4)) + return -1; + + if (avctx->bits_per_coded_sample == 24) { + uint32_t *o = data; + for (; buf_size > 6; buf_size -= 7) { + *o++ = (av_reverse[buf[2]] << 24) | + (av_reverse[buf[1]] << 16) | + (av_reverse[buf[0]] << 8); + *o++ = (av_reverse[buf[6] & 0xf0] << 28) | + (av_reverse[buf[5]] << 20) | + (av_reverse[buf[4]] << 12) | + (av_reverse[buf[3] & 0x0f] << 8); + buf += 7; + } + *data_size = (uint8_t*) o - (uint8_t*) data; + } else if (avctx->bits_per_coded_sample == 20) { + uint32_t *o = data; + for (; buf_size > 5; buf_size -= 6) { + *o++ = (av_reverse[buf[2] & 0xf0] << 28) | + (av_reverse[buf[1]] << 20) | + (av_reverse[buf[0]] << 12); + *o++ = (av_reverse[buf[5] & 0xf0] << 28) | + (av_reverse[buf[4]] << 20) | + (av_reverse[buf[3]] << 12); + buf += 6; + } + *data_size = (uint8_t*) o - (uint8_t*) data; + } else { + uint16_t *o = data; + for (; buf_size > 4; buf_size -= 5) { + *o++ = (av_reverse[buf[1]] << 8) | + av_reverse[buf[0]]; + *o++ = (av_reverse[buf[4] & 0xf0] << 12) | + (av_reverse[buf[3]] << 4) | + av_reverse[buf[2] & 0x0f]; + buf += 5; + } + *data_size = (uint8_t*) o - (uint8_t*) data; + } + + return buf - avpkt->data; +} + + +AVCodec ff_s302m_decoder = { + .name = "s302m", + .type = AVMEDIA_TYPE_AUDIO, + .id = CODEC_ID_S302M, + .priv_data_size = 0, + .decode = s302m_decode_frame, + .long_name = NULL_IF_CONFIG_SMALL("SMPTE 302M"), +}; -- cgit v1.2.3