2006-09-10 17:02:42 +03:00
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/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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2006-10-07 18:30:46 +03:00
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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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2006-09-10 17:02:42 +03:00
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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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2006-10-07 18:30:46 +03:00
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* version 2.1 of the License, or (at your option) any later version.
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2006-09-10 17:02:42 +03:00
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*
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2006-10-07 18:30:46 +03:00
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* FFmpeg is distributed in the hope that it will be useful,
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2006-09-10 17:02:42 +03:00
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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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2006-10-07 18:30:46 +03:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-09-10 17:02:42 +03:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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2006-07-06 18:04:46 +03:00
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#include "avcodec.h"
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2006-11-10 03:41:53 +02:00
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#include "mpegaudio.h"
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2006-07-06 18:04:46 +03:00
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AVBitStreamFilter *first_bitstream_filter= NULL;
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void av_register_bitstream_filter(AVBitStreamFilter *bsf){
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bsf->next = first_bitstream_filter;
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first_bitstream_filter= bsf;
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}
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AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){
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AVBitStreamFilter *bsf= first_bitstream_filter;
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while(bsf){
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if(!strcmp(name, bsf->name)){
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AVBitStreamFilterContext *bsfc= av_mallocz(sizeof(AVBitStreamFilterContext));
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bsfc->filter= bsf;
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2006-07-06 18:28:17 +03:00
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bsfc->priv_data= av_mallocz(bsf->priv_data_size);
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2006-07-06 18:04:46 +03:00
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return bsfc;
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}
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bsf= bsf->next;
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}
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return NULL;
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}
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void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc){
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2006-07-06 18:28:17 +03:00
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av_freep(&bsfc->priv_data);
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2006-07-06 18:04:46 +03:00
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av_parser_close(bsfc->parser);
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av_free(bsfc);
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}
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int av_bitstream_filter_filter(AVBitStreamFilterContext *bsfc,
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AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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2006-07-06 18:28:17 +03:00
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*poutbuf= (uint8_t *) buf;
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*poutbuf_size= buf_size;
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2006-07-06 18:04:46 +03:00
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return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size, buf, buf_size, keyframe);
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}
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static int dump_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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int cmd= args ? *args : 0;
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/* cast to avoid warning about discarding qualifiers */
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if(avctx->extradata){
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if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER) && cmd=='a')
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||(keyframe && (cmd=='k' || !cmd))
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||(cmd=='e')
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/*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
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int size= buf_size + avctx->extradata_size;
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*poutbuf_size= size;
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*poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
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memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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return 1;
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}
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}
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return 0;
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}
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static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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int cmd= args ? *args : 0;
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AVCodecParserContext *s;
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if(!bsfc->parser){
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bsfc->parser= av_parser_init(avctx->codec_id);
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}
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s= bsfc->parser;
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if(s && s->parser->split){
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if( (((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) && cmd=='a')
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||(!keyframe && cmd=='k')
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||(cmd=='e' || !cmd)
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){
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int i= s->parser->split(avctx, buf, buf_size);
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buf += i;
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buf_size -= i;
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}
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}
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*poutbuf= (uint8_t *) buf;
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*poutbuf_size= buf_size;
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return 0;
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}
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2006-07-06 18:28:17 +03:00
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static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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int amount= args ? atoi(args) : 10000;
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unsigned int *state= bsfc->priv_data;
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int i;
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*poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(*poutbuf, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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for(i=0; i<buf_size; i++){
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(*state) += (*poutbuf)[i] + 1;
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if(*state % amount == 0)
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(*poutbuf)[i] = *state;
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}
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return 1;
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}
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2006-11-10 13:31:02 +02:00
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#define MP3_MASK 0xFFFE0CCF
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2006-11-10 03:41:53 +02:00
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static int mp3_header_compress(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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2006-11-10 13:31:02 +02:00
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uint32_t header, extraheader;
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int mode_extension, header_size;
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2006-11-10 03:41:53 +02:00
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if(avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
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av_log(avctx, AV_LOG_ERROR, "not standards compliant\n");
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return -1;
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}
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2006-11-10 13:31:02 +02:00
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header = BE_32(buf);
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2006-11-10 03:41:53 +02:00
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mode_extension= (header>>4)&3;
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2006-11-10 13:31:02 +02:00
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if(ff_mpa_check_header(header) < 0 || (header&0x60000) != 0x20000){
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output_unchanged:
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2006-11-10 03:41:53 +02:00
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*poutbuf= (uint8_t *) buf;
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*poutbuf_size= buf_size;
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av_log(avctx, AV_LOG_INFO, "cannot compress %08X\n", header);
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return 0;
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}
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2006-11-10 13:31:02 +02:00
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if(avctx->extradata_size == 0){
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avctx->extradata_size=15;
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avctx->extradata= av_malloc(avctx->extradata_size);
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strcpy(avctx->extradata, "FFCMP3 0.0");
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memcpy(avctx->extradata+11, buf, 4);
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}
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if(avctx->extradata_size != 15){
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av_log(avctx, AV_LOG_ERROR, "Extradata invalid\n");
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return -1;
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}
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extraheader = BE_32(avctx->extradata+11);
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if((extraheader&MP3_MASK) != (header&MP3_MASK))
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goto output_unchanged;
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header_size= (header&0x10000) ? 4 : 6;
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*poutbuf_size= buf_size - header_size;
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*poutbuf= av_malloc(buf_size - header_size + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(*poutbuf, buf + header_size, buf_size - header_size + FF_INPUT_BUFFER_PADDING_SIZE);
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2006-11-10 03:41:53 +02:00
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if(avctx->channels==2){
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if((header & (3<<19)) != 3<<19){
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(*poutbuf)[1] &= 0x3F;
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(*poutbuf)[1] |= mode_extension<<6;
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FFSWAP(int, (*poutbuf)[1], (*poutbuf)[2]);
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}else{
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(*poutbuf)[1] &= 0x8F;
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(*poutbuf)[1] |= mode_extension<<4;
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}
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}
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return 1;
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}
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static int mp3_header_decompress(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
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uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size, int keyframe){
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uint32_t header;
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int sample_rate= avctx->sample_rate;
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int sample_rate_index=0;
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int lsf, mpeg25, bitrate_index, frame_size;
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2006-11-10 13:31:02 +02:00
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header = BE_32(buf);
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2006-11-10 03:41:53 +02:00
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if(ff_mpa_check_header(header) >= 0){
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*poutbuf= (uint8_t *) buf;
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*poutbuf_size= buf_size;
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return 0;
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}
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2006-11-10 13:31:02 +02:00
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if(avctx->extradata_size != 15 || strcmp(avctx->extradata, "FFCMP3 0.0")){
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av_log(avctx, AV_LOG_ERROR, "Extradata invalid %d\n", avctx->extradata_size);
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return -1;
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}
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header= BE_32(avctx->extradata+11) & MP3_MASK;
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2006-11-10 03:41:53 +02:00
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lsf = sample_rate < (24000+32000)/2;
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mpeg25 = sample_rate < (12000+16000)/2;
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2006-11-10 13:31:02 +02:00
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sample_rate_index= (header>>10)&3;
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2006-11-10 03:41:53 +02:00
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sample_rate= mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off
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for(bitrate_index=2; bitrate_index<30; bitrate_index++){
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frame_size = mpa_bitrate_tab[lsf][2][bitrate_index>>1];
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frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
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if(frame_size == buf_size + 4)
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break;
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2006-11-10 13:31:02 +02:00
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if(frame_size == buf_size + 6)
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break;
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2006-11-10 03:41:53 +02:00
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}
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if(bitrate_index == 30){
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av_log(avctx, AV_LOG_ERROR, "couldnt find bitrate_index\n");
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return -1;
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}
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header |= (bitrate_index&1)<<9;
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header |= (bitrate_index>>1)<<12;
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2006-11-10 13:31:02 +02:00
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header |= (frame_size == buf_size + 4)<<16; //FIXME actually set a correct crc instead of 0
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2006-11-10 03:41:53 +02:00
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2006-11-10 13:31:02 +02:00
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*poutbuf_size= frame_size;
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*poutbuf= av_malloc(frame_size + FF_INPUT_BUFFER_PADDING_SIZE);
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memcpy(*poutbuf + frame_size - buf_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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2006-11-10 03:41:53 +02:00
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if(avctx->channels==2){
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2006-11-10 13:31:02 +02:00
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uint8_t *p= *poutbuf + frame_size - buf_size;
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2006-11-10 03:41:53 +02:00
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if(lsf){
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2006-11-10 13:31:02 +02:00
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FFSWAP(int, p[1], p[2]);
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header |= (p[1] & 0xC0)>>2;
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2006-11-10 13:45:43 +02:00
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p[1] &= 0x3F;
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2006-11-10 03:41:53 +02:00
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}else{
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2006-11-10 13:31:02 +02:00
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header |= p[1] & 0x30;
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2006-11-10 13:45:43 +02:00
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p[1] &= 0xCF;
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2006-11-10 03:41:53 +02:00
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}
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}
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(*poutbuf)[0]= header>>24;
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(*poutbuf)[1]= header>>16;
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(*poutbuf)[2]= header>> 8;
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(*poutbuf)[3]= header ;
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return 1;
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}
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2006-07-06 18:04:46 +03:00
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AVBitStreamFilter dump_extradata_bsf={
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"dump_extra",
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2006-07-06 18:28:17 +03:00
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0,
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2006-07-06 18:04:46 +03:00
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dump_extradata,
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};
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AVBitStreamFilter remove_extradata_bsf={
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"remove_extra",
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2006-07-06 18:28:17 +03:00
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0,
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2006-07-06 18:04:46 +03:00
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remove_extradata,
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};
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2006-07-06 18:28:17 +03:00
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AVBitStreamFilter noise_bsf={
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"noise",
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sizeof(int),
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noise,
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};
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2006-11-10 03:41:53 +02:00
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AVBitStreamFilter mp3_header_compress_bsf={
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"mp3comp",
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0,
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mp3_header_compress,
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};
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AVBitStreamFilter mp3_header_decompress_bsf={
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"mp3decomp",
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0,
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mp3_header_decompress,
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};
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