*/
#include "avcodec.h"
-#include "mpegaudio.h"
AVBitStreamFilter *first_bitstream_filter= NULL;
*poutbuf_size= buf_size;
return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size, buf, buf_size, keyframe);
}
-
-static int dump_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size, int keyframe){
- int cmd= args ? *args : 0;
- /* cast to avoid warning about discarding qualifiers */
- if(avctx->extradata){
- if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER) && cmd=='a')
- ||(keyframe && (cmd=='k' || !cmd))
- ||(cmd=='e')
- /*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
- int size= buf_size + avctx->extradata_size;
- *poutbuf_size= size;
- *poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
-
- memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
- memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
- return 1;
- }
- }
- return 0;
-}
-
-static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size, int keyframe){
- int cmd= args ? *args : 0;
- AVCodecParserContext *s;
-
- if(!bsfc->parser){
- bsfc->parser= av_parser_init(avctx->codec_id);
- }
- s= bsfc->parser;
-
- if(s && s->parser->split){
- if( (((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) && cmd=='a')
- ||(!keyframe && cmd=='k')
- ||(cmd=='e' || !cmd)
- ){
- int i= s->parser->split(avctx, buf, buf_size);
- buf += i;
- buf_size -= i;
- }
- }
- *poutbuf= (uint8_t *) buf;
- *poutbuf_size= buf_size;
-
- return 0;
-}
-
-static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size, int keyframe){
- int amount= args ? atoi(args) : 10000;
- unsigned int *state= bsfc->priv_data;
- int i;
-
- *poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
-
- memcpy(*poutbuf, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
- for(i=0; i<buf_size; i++){
- (*state) += (*poutbuf)[i] + 1;
- if(*state % amount == 0)
- (*poutbuf)[i] = *state;
- }
- return 1;
-}
-
-#define MP3_MASK 0xFFFE0CCF
-
-static int mp3_header_compress(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size, int keyframe){
- uint32_t header, extraheader;
- int mode_extension, header_size;
-
- if(avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
- av_log(avctx, AV_LOG_ERROR, "not standards compliant\n");
- return -1;
- }
-
- header = BE_32(buf);
- mode_extension= (header>>4)&3;
-
- if(ff_mpa_check_header(header) < 0 || (header&0x60000) != 0x20000){
-output_unchanged:
- *poutbuf= (uint8_t *) buf;
- *poutbuf_size= buf_size;
-
- av_log(avctx, AV_LOG_INFO, "cannot compress %08X\n", header);
- return 0;
- }
-
- if(avctx->extradata_size == 0){
- avctx->extradata_size=15;
- avctx->extradata= av_malloc(avctx->extradata_size);
- strcpy(avctx->extradata, "FFCMP3 0.0");
- memcpy(avctx->extradata+11, buf, 4);
- }
- if(avctx->extradata_size != 15){
- av_log(avctx, AV_LOG_ERROR, "Extradata invalid\n");
- return -1;
- }
- extraheader = BE_32(avctx->extradata+11);
- if((extraheader&MP3_MASK) != (header&MP3_MASK))
- goto output_unchanged;
-
- header_size= (header&0x10000) ? 4 : 6;
-
- *poutbuf_size= buf_size - header_size;
- *poutbuf= av_malloc(buf_size - header_size + FF_INPUT_BUFFER_PADDING_SIZE);
- memcpy(*poutbuf, buf + header_size, buf_size - header_size + FF_INPUT_BUFFER_PADDING_SIZE);
-
- if(avctx->channels==2){
- if((header & (3<<19)) != 3<<19){
- (*poutbuf)[1] &= 0x3F;
- (*poutbuf)[1] |= mode_extension<<6;
- FFSWAP(int, (*poutbuf)[1], (*poutbuf)[2]);
- }else{
- (*poutbuf)[1] &= 0x8F;
- (*poutbuf)[1] |= mode_extension<<4;
- }
- }
-
- return 1;
-}
-
-static int mp3_header_decompress(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size, int keyframe){
- uint32_t header;
- int sample_rate= avctx->sample_rate;
- int sample_rate_index=0;
- int lsf, mpeg25, bitrate_index, frame_size;
-
- header = BE_32(buf);
- if(ff_mpa_check_header(header) >= 0){
- *poutbuf= (uint8_t *) buf;
- *poutbuf_size= buf_size;
-
- return 0;
- }
-
- if(avctx->extradata_size != 15 || strcmp(avctx->extradata, "FFCMP3 0.0")){
- av_log(avctx, AV_LOG_ERROR, "Extradata invalid %d\n", avctx->extradata_size);
- return -1;
- }
-
- header= BE_32(avctx->extradata+11) & MP3_MASK;
-
- lsf = sample_rate < (24000+32000)/2;
- mpeg25 = sample_rate < (12000+16000)/2;
- sample_rate_index= (header>>10)&3;
- sample_rate= 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 = 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(avctx, AV_LOG_ERROR, "couldnt find bitrate_index\n");
- return -1;
- }
-
- 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
-
- *poutbuf_size= frame_size;
- *poutbuf= av_malloc(frame_size + FF_INPUT_BUFFER_PADDING_SIZE);
- memcpy(*poutbuf + frame_size - buf_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
-
- if(avctx->channels==2){
- uint8_t *p= *poutbuf + 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;
- }
- }
-
- (*poutbuf)[0]= header>>24;
- (*poutbuf)[1]= header>>16;
- (*poutbuf)[2]= header>> 8;
- (*poutbuf)[3]= header ;
-
- return 1;
-}
-
-AVBitStreamFilter dump_extradata_bsf={
- "dump_extra",
- 0,
- dump_extradata,
-};
-
-AVBitStreamFilter remove_extradata_bsf={
- "remove_extra",
- 0,
- remove_extradata,
-};
-
-AVBitStreamFilter noise_bsf={
- "noise",
- sizeof(int),
- noise,
-};
-
-AVBitStreamFilter mp3_header_compress_bsf={
- "mp3comp",
- 0,
- mp3_header_compress,
-};
-
-AVBitStreamFilter mp3_header_decompress_bsf={
- "mp3decomp",
- 0,
- mp3_header_decompress,
-};