231 lines
8 KiB
C
231 lines
8 KiB
C
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/*
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* SMPTE 302M decoder
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* Copyright (c) 2008 Laurent Aimar <fenrir@videolan.org>
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* Copyright (c) 2009 Baptiste Coudurier <baptiste.coudurier@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg 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 FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "libavutil/log.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "mathops.h"
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#define AES3_HEADER_LEN 4
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typedef struct S302Context {
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AVClass *class;
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int non_pcm_mode;
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} S302Context;
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static int s302m_parse_frame_header(AVCodecContext *avctx, const uint8_t *buf,
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int buf_size)
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{
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uint32_t h;
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int frame_size, channels, bits;
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if (buf_size <= AES3_HEADER_LEN) {
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av_log(avctx, AV_LOG_ERROR, "frame is too short\n");
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return AVERROR_INVALIDDATA;
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}
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/*
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* AES3 header :
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* size: 16
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* number channels 2
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* channel_id 8
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* bits per samples 2
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* alignments 4
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*/
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h = AV_RB32(buf);
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frame_size = (h >> 16) & 0xffff;
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channels = ((h >> 14) & 0x0003) * 2 + 2;
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bits = ((h >> 4) & 0x0003) * 4 + 16;
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if (AES3_HEADER_LEN + frame_size != buf_size || bits > 24) {
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av_log(avctx, AV_LOG_ERROR, "frame has invalid header\n");
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return AVERROR_INVALIDDATA;
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}
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/* Set output properties */
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avctx->bits_per_raw_sample = bits;
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if (bits > 16)
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avctx->sample_fmt = AV_SAMPLE_FMT_S32;
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else
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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avctx->channels = channels;
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switch(channels) {
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case 2:
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avctx->channel_layout = AV_CH_LAYOUT_STEREO;
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break;
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case 4:
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avctx->channel_layout = AV_CH_LAYOUT_QUAD;
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break;
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case 6:
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avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK;
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break;
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case 8:
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avctx->channel_layout = AV_CH_LAYOUT_5POINT1_BACK | AV_CH_LAYOUT_STEREO_DOWNMIX;
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}
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return frame_size;
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}
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static int s302m_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame_ptr, AVPacket *avpkt)
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{
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S302Context *s = avctx->priv_data;
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AVFrame *frame = data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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int block_size, ret;
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int i;
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int non_pcm_data_type = -1;
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int frame_size = s302m_parse_frame_header(avctx, buf, buf_size);
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if (frame_size < 0)
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return frame_size;
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buf_size -= AES3_HEADER_LEN;
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buf += AES3_HEADER_LEN;
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/* get output buffer */
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block_size = (avctx->bits_per_raw_sample + 4) / 4;
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frame->nb_samples = 2 * (buf_size / block_size) / avctx->channels;
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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avctx->bit_rate = 48000 * avctx->channels * (avctx->bits_per_raw_sample + 4) +
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32 * 48000 / frame->nb_samples;
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buf_size = (frame->nb_samples * avctx->channels / 2) * block_size;
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if (avctx->bits_per_raw_sample == 24) {
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uint32_t *o = (uint32_t *)frame->data[0];
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for (; buf_size > 6; buf_size -= 7) {
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*o++ = ((unsigned)ff_reverse[buf[2]] << 24) |
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(ff_reverse[buf[1]] << 16) |
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(ff_reverse[buf[0]] << 8);
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*o++ = ((unsigned)ff_reverse[buf[6] & 0xf0] << 28) |
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(ff_reverse[buf[5]] << 20) |
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(ff_reverse[buf[4]] << 12) |
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(ff_reverse[buf[3] & 0x0f] << 4);
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buf += 7;
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}
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o = (uint32_t *)frame->data[0];
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if (avctx->channels == 2)
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for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
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if (o[i] || o[i+1] || o[i+2] || o[i+3])
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break;
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if (o[i+4] == 0x96F87200U && o[i+5] == 0xA54E1F00) {
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non_pcm_data_type = (o[i+6] >> 16) & 0x1F;
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break;
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}
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}
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} else if (avctx->bits_per_raw_sample == 20) {
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uint32_t *o = (uint32_t *)frame->data[0];
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for (; buf_size > 5; buf_size -= 6) {
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*o++ = ((unsigned)ff_reverse[buf[2] & 0xf0] << 28) |
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(ff_reverse[buf[1]] << 20) |
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(ff_reverse[buf[0]] << 12);
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*o++ = ((unsigned)ff_reverse[buf[5] & 0xf0] << 28) |
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(ff_reverse[buf[4]] << 20) |
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(ff_reverse[buf[3]] << 12);
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buf += 6;
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}
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o = (uint32_t *)frame->data[0];
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if (avctx->channels == 2)
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for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
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if (o[i] || o[i+1] || o[i+2] || o[i+3])
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break;
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if (o[i+4] == 0x6F872000U && o[i+5] == 0x54E1F000) {
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non_pcm_data_type = (o[i+6] >> 16) & 0x1F;
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break;
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}
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}
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} else {
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uint16_t *o = (uint16_t *)frame->data[0];
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for (; buf_size > 4; buf_size -= 5) {
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*o++ = (ff_reverse[buf[1]] << 8) |
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ff_reverse[buf[0]];
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*o++ = (ff_reverse[buf[4] & 0xf0] << 12) |
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(ff_reverse[buf[3]] << 4) |
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(ff_reverse[buf[2]] >> 4);
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buf += 5;
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}
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o = (uint16_t *)frame->data[0];
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if (avctx->channels == 2)
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for (i=0; i<frame->nb_samples * 2 - 6; i+=2) {
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if (o[i] || o[i+1] || o[i+2] || o[i+3])
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break;
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if (o[i+4] == 0xF872U && o[i+5] == 0x4E1F) {
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non_pcm_data_type = (o[i+6] & 0x1F);
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break;
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}
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}
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}
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if (non_pcm_data_type != -1) {
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if (s->non_pcm_mode == 3) {
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av_log(avctx, AV_LOG_ERROR,
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"S302 non PCM mode with data type %d not supported\n",
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non_pcm_data_type);
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return AVERROR_PATCHWELCOME;
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}
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if (s->non_pcm_mode & 1) {
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return avpkt->size;
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}
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}
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avctx->sample_rate = 48000;
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*got_frame_ptr = 1;
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return avpkt->size;
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}
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_DECODING_PARAM
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static const AVOption s302m_options[] = {
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{"non_pcm_mode", "Chooses what to do with NON-PCM", offsetof(S302Context, non_pcm_mode), AV_OPT_TYPE_INT, {.i64 = 3}, 0, 3, FLAGS, "non_pcm_mode"},
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{"copy" , "Pass NON-PCM through unchanged" , 0, AV_OPT_TYPE_CONST, {.i64 = 0}, 0, 3, FLAGS, "non_pcm_mode"},
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{"drop" , "Drop NON-PCM" , 0, AV_OPT_TYPE_CONST, {.i64 = 1}, 0, 3, FLAGS, "non_pcm_mode"},
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{"decode_copy" , "Decode if possible else passthrough", 0, AV_OPT_TYPE_CONST, {.i64 = 2}, 0, 3, FLAGS, "non_pcm_mode"},
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{"decode_drop" , "Decode if possible else drop" , 0, AV_OPT_TYPE_CONST, {.i64 = 3}, 0, 3, FLAGS, "non_pcm_mode"},
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{NULL}
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};
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static const AVClass s302m_class = {
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.class_name = "SMPTE 302M Decoder",
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.item_name = av_default_item_name,
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.option = s302m_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVCodec ff_s302m_decoder = {
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.name = "s302m",
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.long_name = NULL_IF_CONFIG_SMALL("SMPTE 302M"),
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.type = AVMEDIA_TYPE_AUDIO,
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.id = AV_CODEC_ID_S302M,
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.priv_data_size = sizeof(S302Context),
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.decode = s302m_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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.priv_class = &s302m_class,
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};
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