+/*
+ * 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 "avcodec.h"
+#include "mpegaudio.h"
AVBitStreamFilter *first_bitstream_filter= NULL;
if(!strcmp(name, bsf->name)){
AVBitStreamFilterContext *bsfc= av_mallocz(sizeof(AVBitStreamFilterContext));
bsfc->filter= bsf;
+ bsfc->priv_data= av_mallocz(bsf->priv_data_size);
return bsfc;
}
bsf= bsf->next;
}
void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc){
+ av_freep(&bsfc->priv_data);
av_parser_close(bsfc->parser);
av_free(bsfc);
}
AVCodecContext *avctx, const char *args,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size, int keyframe){
+ *poutbuf= (uint8_t *) buf;
+ *poutbuf_size= buf_size;
return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size, buf, buf_size, keyframe);
}
const uint8_t *buf, int buf_size, int keyframe){
int cmd= args ? *args : 0;
/* cast to avoid warning about discarding qualifiers */
- *poutbuf= (uint8_t *) buf;
- *poutbuf_size= buf_size;
if(avctx->extradata){
if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER) && cmd=='a')
||(keyframe && (cmd=='k' || !cmd))
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,
+};
projects / ffmpeg / blobdiff