innoHeim/Rsupport Screen Capture Codec decoder
[ffmpeg.git] / libavcodec / bitstream_filter.c
index 89fc4e1..3b19bbd 100644 (file)
@@ -1,49 +1,74 @@
 /*
  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <string.h>
+
 #include "avcodec.h"
-#include "mpegaudio.h"
+#include "libavutil/mem.h"
 
-AVBitStreamFilter *first_bitstream_filter= NULL;
+static AVBitStreamFilter *first_bitstream_filter = NULL;
 
-void av_register_bitstream_filter(AVBitStreamFilter *bsf){
-    bsf->next = first_bitstream_filter;
-    first_bitstream_filter= bsf;
+AVBitStreamFilter *av_bitstream_filter_next(const AVBitStreamFilter *f)
+{
+    if (f)
+        return f->next;
+    else
+        return first_bitstream_filter;
 }
 
-AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){
-    AVBitStreamFilter *bsf= first_bitstream_filter;
+void av_register_bitstream_filter(AVBitStreamFilter *bsf)
+{
+    bsf->next              = first_bitstream_filter;
+    first_bitstream_filter = bsf;
+}
 
-    while(bsf){
-        if(!strcmp(name, bsf->name)){
-            AVBitStreamFilterContext *bsfc= av_mallocz(sizeof(AVBitStreamFilterContext));
-            bsfc->filter= bsf;
-            bsfc->priv_data= av_mallocz(bsf->priv_data_size);
+AVBitStreamFilterContext *av_bitstream_filter_init(const char *name)
+{
+    AVBitStreamFilter *bsf = first_bitstream_filter;
+
+    while (bsf) {
+        if (!strcmp(name, bsf->name)) {
+            AVBitStreamFilterContext *bsfc =
+                av_mallocz(sizeof(AVBitStreamFilterContext));
+            if (!bsfc)
+                return NULL;
+            bsfc->filter    = bsf;
+            bsfc->priv_data = NULL;
+            if (bsf->priv_data_size) {
+                bsfc->priv_data = av_mallocz(bsf->priv_data_size);
+                if (!bsfc->priv_data) {
+                    av_freep(&bsfc);
+                    return NULL;
+                }
+            }
             return bsfc;
         }
-        bsf= bsf->next;
+        bsf = bsf->next;
     }
     return NULL;
 }
 
-void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc){
+void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc)
+{
+    if (bsfc->filter->close)
+        bsfc->filter->close(bsfc);
     av_freep(&bsfc->priv_data);
     av_parser_close(bsfc->parser);
     av_free(bsfc);
@@ -51,234 +76,11 @@ void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc){
 
 int av_bitstream_filter_filter(AVBitStreamFilterContext *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);
-}
-
-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 = AV_RB32(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 = AV_RB32(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;
+                               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);
 }
-
-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 = AV_RB32(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= AV_RB32(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,
-};