57
63
*poutbuf_size= buf_size;
58
64
return bsfc->filter->filter(bsfc, avctx, args, poutbuf, poutbuf_size, buf, buf_size, keyframe);
61
static int dump_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
62
uint8_t **poutbuf, int *poutbuf_size,
63
const uint8_t *buf, int buf_size, int keyframe){
64
int cmd= args ? *args : 0;
65
/* cast to avoid warning about discarding qualifiers */
67
if( (keyframe && (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER) && cmd=='a')
68
||(keyframe && (cmd=='k' || !cmd))
70
/*||(? && (s->flags & PARSER_FLAG_DUMP_EXTRADATA_AT_BEGIN)*/){
71
int size= buf_size + avctx->extradata_size;
73
*poutbuf= av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
75
memcpy(*poutbuf, avctx->extradata, avctx->extradata_size);
76
memcpy((*poutbuf) + avctx->extradata_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
83
static int remove_extradata(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
84
uint8_t **poutbuf, int *poutbuf_size,
85
const uint8_t *buf, int buf_size, int keyframe){
86
int cmd= args ? *args : 0;
87
AVCodecParserContext *s;
90
bsfc->parser= av_parser_init(avctx->codec_id);
94
if(s && s->parser->split){
95
if( (((avctx->flags & CODEC_FLAG_GLOBAL_HEADER) || (avctx->flags2 & CODEC_FLAG2_LOCAL_HEADER)) && cmd=='a')
96
||(!keyframe && cmd=='k')
99
int i= s->parser->split(avctx, buf, buf_size);
104
*poutbuf= (uint8_t *) buf;
105
*poutbuf_size= buf_size;
110
static int noise(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
111
uint8_t **poutbuf, int *poutbuf_size,
112
const uint8_t *buf, int buf_size, int keyframe){
113
int amount= args ? atoi(args) : 10000;
114
unsigned int *state= bsfc->priv_data;
117
*poutbuf= av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
119
memcpy(*poutbuf, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
120
for(i=0; i<buf_size; i++){
121
(*state) += (*poutbuf)[i] + 1;
122
if(*state % amount == 0)
123
(*poutbuf)[i] = *state;
128
#define MP3_MASK 0xFFFE0CCF
130
static int mp3_header_compress(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
131
uint8_t **poutbuf, int *poutbuf_size,
132
const uint8_t *buf, int buf_size, int keyframe){
133
uint32_t header, extraheader;
134
int mode_extension, header_size;
136
if(avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
137
av_log(avctx, AV_LOG_ERROR, "not standards compliant\n");
141
header = AV_RB32(buf);
142
mode_extension= (header>>4)&3;
144
if(ff_mpa_check_header(header) < 0 || (header&0x60000) != 0x20000){
146
*poutbuf= (uint8_t *) buf;
147
*poutbuf_size= buf_size;
149
av_log(avctx, AV_LOG_INFO, "cannot compress %08X\n", header);
153
if(avctx->extradata_size == 0){
154
avctx->extradata_size=15;
155
avctx->extradata= av_malloc(avctx->extradata_size);
156
strcpy(avctx->extradata, "FFCMP3 0.0");
157
memcpy(avctx->extradata+11, buf, 4);
159
if(avctx->extradata_size != 15){
160
av_log(avctx, AV_LOG_ERROR, "Extradata invalid\n");
163
extraheader = AV_RB32(avctx->extradata+11);
164
if((extraheader&MP3_MASK) != (header&MP3_MASK))
165
goto output_unchanged;
167
header_size= (header&0x10000) ? 4 : 6;
169
*poutbuf_size= buf_size - header_size;
170
*poutbuf= av_malloc(buf_size - header_size + FF_INPUT_BUFFER_PADDING_SIZE);
171
memcpy(*poutbuf, buf + header_size, buf_size - header_size + FF_INPUT_BUFFER_PADDING_SIZE);
173
if(avctx->channels==2){
174
if((header & (3<<19)) != 3<<19){
175
(*poutbuf)[1] &= 0x3F;
176
(*poutbuf)[1] |= mode_extension<<6;
177
FFSWAP(int, (*poutbuf)[1], (*poutbuf)[2]);
179
(*poutbuf)[1] &= 0x8F;
180
(*poutbuf)[1] |= mode_extension<<4;
187
static int mp3_header_decompress(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
188
uint8_t **poutbuf, int *poutbuf_size,
189
const uint8_t *buf, int buf_size, int keyframe){
191
int sample_rate= avctx->sample_rate;
192
int sample_rate_index=0;
193
int lsf, mpeg25, bitrate_index, frame_size;
195
header = AV_RB32(buf);
196
if(ff_mpa_check_header(header) >= 0){
197
*poutbuf= (uint8_t *) buf;
198
*poutbuf_size= buf_size;
203
if(avctx->extradata_size != 15 || strcmp(avctx->extradata, "FFCMP3 0.0")){
204
av_log(avctx, AV_LOG_ERROR, "Extradata invalid %d\n", avctx->extradata_size);
208
header= AV_RB32(avctx->extradata+11) & MP3_MASK;
210
lsf = sample_rate < (24000+32000)/2;
211
mpeg25 = sample_rate < (12000+16000)/2;
212
sample_rate_index= (header>>10)&3;
213
sample_rate= mpa_freq_tab[sample_rate_index] >> (lsf + mpeg25); //in case sample rate is a little off
215
for(bitrate_index=2; bitrate_index<30; bitrate_index++){
216
frame_size = mpa_bitrate_tab[lsf][2][bitrate_index>>1];
217
frame_size = (frame_size * 144000) / (sample_rate << lsf) + (bitrate_index&1);
218
if(frame_size == buf_size + 4)
220
if(frame_size == buf_size + 6)
223
if(bitrate_index == 30){
224
av_log(avctx, AV_LOG_ERROR, "couldnt find bitrate_index\n");
228
header |= (bitrate_index&1)<<9;
229
header |= (bitrate_index>>1)<<12;
230
header |= (frame_size == buf_size + 4)<<16; //FIXME actually set a correct crc instead of 0
232
*poutbuf_size= frame_size;
233
*poutbuf= av_malloc(frame_size + FF_INPUT_BUFFER_PADDING_SIZE);
234
memcpy(*poutbuf + frame_size - buf_size, buf, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
236
if(avctx->channels==2){
237
uint8_t *p= *poutbuf + frame_size - buf_size;
239
FFSWAP(int, p[1], p[2]);
240
header |= (p[1] & 0xC0)>>2;
243
header |= p[1] & 0x30;
248
(*poutbuf)[0]= header>>24;
249
(*poutbuf)[1]= header>>16;
250
(*poutbuf)[2]= header>> 8;
251
(*poutbuf)[3]= header ;
256
AVBitStreamFilter dump_extradata_bsf={
262
AVBitStreamFilter remove_extradata_bsf={
268
AVBitStreamFilter noise_bsf={
274
AVBitStreamFilter mp3_header_compress_bsf={
280
AVBitStreamFilter mp3_header_decompress_bsf={
283
mp3_header_decompress,