aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/common.h"
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bsf.h"
#include "mpegaudiodecheader.h"
#include "mpegaudiodata.h"
static int mp3_header_decompress(AVBSFContext *ctx, AVPacket *out)
{
AVPacket *in;
uint32_t header;
int sample_rate= ctx->par_in->sample_rate;
int sample_rate_index=0;
int lsf, mpeg25, bitrate_index, frame_size, ret;
uint8_t *buf;
int buf_size;
ret = ff_bsf_get_packet(ctx, &in);
if (ret < 0)
return ret;
buf = in->data;
buf_size = in->size;
header = AV_RB32(buf);
if(ff_mpa_check_header(header) >= 0){
av_packet_move_ref(out, in);
av_packet_free(&in);
return 0;
}
if(ctx->par_in->extradata_size != 15 || strcmp(ctx->par_in->extradata, "FFCMP3 0.0")){
av_log(ctx, AV_LOG_ERROR, "Extradata invalid %d\n", ctx->par_in->extradata_size);
ret = AVERROR(EINVAL);
goto fail;
}
header= AV_RB32(ctx->par_in->extradata+11) & MP3_MASK;
lsf = sample_rate < (24000+32000)/2;
mpeg25 = sample_rate < (12000+16000)/2;
sample_rate_index= (header>>10)&3;
if (sample_rate_index == 3) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
sample_rate= avpriv_mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off
for(bitrate_index=2; bitrate_index<30; bitrate_index++){
frame_size = avpriv_mpa_bitrate_tab[lsf][2][bitrate_index>>1];
frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
if(frame_size == buf_size + 4)
break;
if(frame_size == buf_size + 6)
break;
}
if(bitrate_index == 30){
av_log(ctx, AV_LOG_ERROR, "Could not find bitrate_index.\n");
ret = AVERROR(EINVAL);
goto fail;
}
header |= (bitrate_index&1)<<9;
header |= (bitrate_index>>1)<<12;
header |= (frame_size == buf_size + 4)<<16; //FIXME actually set a correct crc instead of 0
ret = av_new_packet(out, frame_size);
if (ret < 0)
goto fail;
ret = av_packet_copy_props(out, in);
if (ret < 0) {
av_packet_unref(out);
goto fail;
}
memcpy(out->data + frame_size - buf_size, buf, buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
if(ctx->par_in->channels==2){
uint8_t *p= out->data + frame_size - buf_size;
if(lsf){
FFSWAP(int, p[1], p[2]);
header |= (p[1] & 0xC0)>>2;
p[1] &= 0x3F;
}else{
header |= p[1] & 0x30;
p[1] &= 0xCF;
}
}
AV_WB32(out->data, header);
ret = 0;
fail:
av_packet_free(&in);
return ret;
}
static const enum AVCodecID codec_ids[] = {
AV_CODEC_ID_MP3, AV_CODEC_ID_NONE,
};
const AVBitStreamFilter ff_mp3_header_decompress_bsf = {
.name = "mp3decomp",
.filter = mp3_header_decompress,
.codec_ids = codec_ids,
};
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