PeerStreamer

/*

 * utils for libavcodec

 * Copyright (c) 2001 Fabrice Bellard

 * Copyright (c) 2002-2004 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

 */

/**

 * @file

 * utils.

 */

#include "libavutil/avstring.h"

#include "libavutil/integer.h"

#include "libavutil/crc.h"

#include "libavutil/pixdesc.h"

#include "libavcore/audioconvert.h"

#include "libavcore/imgutils.h"

#include "libavcore/internal.h"

#include "libavcore/samplefmt.h"

#include "avcodec.h"

#include "dsputil.h"

#include "libavutil/opt.h"

#include "imgconvert.h"

#include "thread.h"

#include "audioconvert.h"

#include "internal.h"

#include <stdlib.h>

#include <stdarg.h>

#include <limits.h>

#include <float.h>

static int volatile entangled_thread_counter=0;

static int (*ff_lockmgr_cb)(void **mutex, enum AVLockOp op);

static void *codec_mutex;

void *av_fast_realloc(void *ptr, unsigned int *size, FF_INTERNALC_MEM_TYPE min_size)

{

    if(min_size < *size)

        return ptr;

    min_size= FFMAX(17*min_size/16 + 32, min_size);

    ptr= av_realloc(ptr, min_size);

    if(!ptr) //we could set this to the unmodified min_size but this is safer if the user lost the ptr and uses NULL now

        min_size= 0;

    *size= min_size;

    return ptr;

}

void av_fast_malloc(void *ptr, unsigned int *size, FF_INTERNALC_MEM_TYPE min_size)

{

    void **p = ptr;

    if (min_size < *size)

        return;

    min_size= FFMAX(17*min_size/16 + 32, min_size);

    av_free(*p);

    *p = av_malloc(min_size);

    if (!*p) min_size = 0;

    *size= min_size;

}

/* encoder management */

static AVCodec *first_avcodec = NULL;

AVCodec *av_codec_next(AVCodec *c){

    if(c) return c->next;

    else  return first_avcodec;

}

void avcodec_register(AVCodec *codec)

{

    AVCodec **p;

    avcodec_init();

    p = &first_avcodec;

    while (*p != NULL) p = &(*p)->next;

    *p = codec;

    codec->next = NULL;

}

#if LIBAVCODEC_VERSION_MAJOR < 53

void register_avcodec(AVCodec *codec)

{

    avcodec_register(codec);

}

#endif

unsigned avcodec_get_edge_width(void)

{

    return EDGE_WIDTH;

}

void avcodec_set_dimensions(AVCodecContext *s, int width, int height){

    s->coded_width = width;

    s->coded_height= height;

    s->width = -((-width )>>s->lowres);

    s->height= -((-height)>>s->lowres);

}

typedef struct InternalBuffer{

    int last_pic_num;

    uint8_t *base[4];

    uint8_t *data[4];

    int linesize[4];

    int width, height;

    enum PixelFormat pix_fmt;

}InternalBuffer;

#define INTERNAL_BUFFER_SIZE 32

void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height, int linesize_align[4]){

    int w_align= 1;

    int h_align= 1;

    switch(s->pix_fmt){

    case PIX_FMT_YUV420P:

    case PIX_FMT_YUYV422:

    case PIX_FMT_UYVY422:

    case PIX_FMT_YUV422P:

    case PIX_FMT_YUV440P:

    case PIX_FMT_YUV444P:

    case PIX_FMT_GRAY8:

    case PIX_FMT_GRAY16BE:

    case PIX_FMT_GRAY16LE:

    case PIX_FMT_YUVJ420P:

    case PIX_FMT_YUVJ422P:

    case PIX_FMT_YUVJ440P:

    case PIX_FMT_YUVJ444P:

    case PIX_FMT_YUVA420P:

        w_align= 16; //FIXME check for non mpeg style codecs and use less alignment

        h_align= 16;

        if(s->codec_id == CODEC_ID_MPEG2VIDEO || s->codec_id == CODEC_ID_MJPEG || s->codec_id == CODEC_ID_AMV || s->codec_id == CODEC_ID_THP || s->codec_id == CODEC_ID_H264)

            h_align= 32; // interlaced is rounded up to 2 MBs

        break;

    case PIX_FMT_YUV411P:

    case PIX_FMT_UYYVYY411:

        w_align=32;

        h_align=8;

        break;

    case PIX_FMT_YUV410P:

        if(s->codec_id == CODEC_ID_SVQ1){

            w_align=64;

            h_align=64;

        }

    case PIX_FMT_RGB555:

        if(s->codec_id == CODEC_ID_RPZA){

            w_align=4;

            h_align=4;

        }

    case PIX_FMT_PAL8:

    case PIX_FMT_BGR8:

    case PIX_FMT_RGB8:

        if(s->codec_id == CODEC_ID_SMC){

            w_align=4;

            h_align=4;

        }

        break;

    case PIX_FMT_BGR24:

        if((s->codec_id == CODEC_ID_MSZH) || (s->codec_id == CODEC_ID_ZLIB)){

            w_align=4;

            h_align=4;

        }

        break;

    default:

        w_align= 1;

        h_align= 1;

        break;

    }

    *width = FFALIGN(*width , w_align);

    *height= FFALIGN(*height, h_align);

    if(s->codec_id == CODEC_ID_H264 || s->lowres)

        *height+=2; // some of the optimized chroma MC reads one line too much

                    // which is also done in mpeg decoders with lowres > 0

    linesize_align[0] =

    linesize_align[1] =

    linesize_align[2] =

    linesize_align[3] = STRIDE_ALIGN;

//STRIDE_ALIGN is 8 for SSE* but this does not work for SVQ1 chroma planes

//we could change STRIDE_ALIGN to 16 for x86/sse but it would increase the

//picture size unneccessarily in some cases. The solution here is not

//pretty and better ideas are welcome!

#if HAVE_MMX

    if(s->codec_id == CODEC_ID_SVQ1 || s->codec_id == CODEC_ID_VP5 ||

       s->codec_id == CODEC_ID_VP6 || s->codec_id == CODEC_ID_VP6F ||

       s->codec_id == CODEC_ID_VP6A) {

        linesize_align[0] =

        linesize_align[1] =

        linesize_align[2] = 16;

    }

#endif

}

void avcodec_align_dimensions(AVCodecContext *s, int *width, int *height){

    int chroma_shift = av_pix_fmt_descriptors[s->pix_fmt].log2_chroma_w;

    int linesize_align[4];

    int align;

    avcodec_align_dimensions2(s, width, height, linesize_align);

    align = FFMAX(linesize_align[0], linesize_align[3]);

    linesize_align[1] <<= chroma_shift;

    linesize_align[2] <<= chroma_shift;

    align = FFMAX3(align, linesize_align[1], linesize_align[2]);

    *width=FFALIGN(*width, align);

}

#if LIBAVCODEC_VERSION_MAJOR < 53

int avcodec_check_dimensions(void *av_log_ctx, unsigned int w, unsigned int h){

    return av_image_check_size(w, h, 0, av_log_ctx);

}

#endif

int avcodec_default_get_buffer(AVCodecContext *s, AVFrame *pic){

    int i;

    int w= s->width;

    int h= s->height;

    InternalBuffer *buf;

    int *picture_number;

    if(pic->data[0]!=NULL) {

        av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");

        return -1;

    }

    if(s->internal_buffer_count >= INTERNAL_BUFFER_SIZE) {

        av_log(s, AV_LOG_ERROR, "internal_buffer_count overflow (missing release_buffer?)\n");

        return -1;

    }

    if(av_image_check_size(w, h, 0, s))

        return -1;

    if(s->internal_buffer==NULL){

        s->internal_buffer= av_mallocz((INTERNAL_BUFFER_SIZE+1)*sizeof(InternalBuffer));

    }

#if 0

    s->internal_buffer= av_fast_realloc(

        s->internal_buffer,

        &s->internal_buffer_size,

        sizeof(InternalBuffer)*FFMAX(99,  s->internal_buffer_count+1)/*FIXME*/

        );

#endif

    buf= &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

    picture_number= &(((InternalBuffer*)s->internal_buffer)[INTERNAL_BUFFER_SIZE]).last_pic_num; //FIXME ugly hack

    (*picture_number)++;

    if(buf->base[0] && (buf->width != w || buf->height != h || buf->pix_fmt != s->pix_fmt)){

        if(s->active_thread_type&FF_THREAD_FRAME) {

            av_log_missing_feature(s, "Width/height changing with frame threads is", 0);

            return -1;

        }

        for(i=0; i<4; i++){

            av_freep(&buf->base[i]);

            buf->data[i]= NULL;

        }

    }

    if(buf->base[0]){

        pic->age= *picture_number - buf->last_pic_num;

        buf->last_pic_num= *picture_number;

    }else{

        int h_chroma_shift, v_chroma_shift;

        int size[4] = {0};

        int tmpsize;

        int unaligned;

        AVPicture picture;

        int stride_align[4];

        avcodec_get_chroma_sub_sample(s->pix_fmt, &h_chroma_shift, &v_chroma_shift);

        avcodec_align_dimensions2(s, &w, &h, stride_align);

        if(!(s->flags&CODEC_FLAG_EMU_EDGE)){

            w+= EDGE_WIDTH*2;

            h+= EDGE_WIDTH*2;

        }

        do {

            // NOTE: do not align linesizes individually, this breaks e.g. assumptions

            // that linesize[0] == 2*linesize[1] in the MPEG-encoder for 4:2:2

            av_image_fill_linesizes(picture.linesize, s->pix_fmt, w);

            // increase alignment of w for next try (rhs gives the lowest bit set in w)

            w += w & ~(w-1);

            unaligned = 0;

            for (i=0; i<4; i++){

                unaligned |= picture.linesize[i] % stride_align[i];

            }

        } while (unaligned);

        tmpsize = av_image_fill_pointers(picture.data, s->pix_fmt, h, NULL, picture.linesize);

        if (tmpsize < 0)

            return -1;

        for (i=0; i<3 && picture.data[i+1]; i++)

            size[i] = picture.data[i+1] - picture.data[i];

        size[i] = tmpsize - (picture.data[i] - picture.data[0]);

        buf->last_pic_num= -256*256*256*64;

        memset(buf->base, 0, sizeof(buf->base));

        memset(buf->data, 0, sizeof(buf->data));

        for(i=0; i<4 && size[i]; i++){

            const int h_shift= i==0 ? 0 : h_chroma_shift;

            const int v_shift= i==0 ? 0 : v_chroma_shift;

            buf->linesize[i]= picture.linesize[i];

            buf->base[i]= av_malloc(size[i]+16); //FIXME 16

            if(buf->base[i]==NULL) return -1;

            memset(buf->base[i], 128, size[i]);

            // no edge if EDGE EMU or not planar YUV

            if((s->flags&CODEC_FLAG_EMU_EDGE) || !size[2])

                buf->data[i] = buf->base[i];

            else

                buf->data[i] = buf->base[i] + FFALIGN((buf->linesize[i]*EDGE_WIDTH>>v_shift) + (EDGE_WIDTH>>h_shift), stride_align[i]);

        }

        if(size[1] && !size[2])

            ff_set_systematic_pal2((uint32_t*)buf->data[1], s->pix_fmt);

        buf->width  = s->width;

        buf->height = s->height;

        buf->pix_fmt= s->pix_fmt;

        pic->age= 256*256*256*64;

    }

    pic->type= FF_BUFFER_TYPE_INTERNAL;

    for(i=0; i<4; i++){

        pic->base[i]= buf->base[i];

        pic->data[i]= buf->data[i];

        pic->linesize[i]= buf->linesize[i];

    }

    s->internal_buffer_count++;

    if(s->pkt) pic->pkt_pts= s->pkt->pts;

    else       pic->pkt_pts= AV_NOPTS_VALUE;

    pic->reordered_opaque= s->reordered_opaque;

    if(s->debug&FF_DEBUG_BUFFERS)

        av_log(s, AV_LOG_DEBUG, "default_get_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);

    return 0;

}

void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){

    int i;

    InternalBuffer *buf, *last;

    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);

    assert(s->internal_buffer_count);

    buf = NULL; /* avoids warning */

    for(i=0; i<s->internal_buffer_count; i++){ //just 3-5 checks so is not worth to optimize

        buf= &((InternalBuffer*)s->internal_buffer)[i];

        if(buf->data[0] == pic->data[0])

            break;

    }

    assert(i < s->internal_buffer_count);

    s->internal_buffer_count--;

    last = &((InternalBuffer*)s->internal_buffer)[s->internal_buffer_count];

    FFSWAP(InternalBuffer, *buf, *last);

    for(i=0; i<4; i++){

        pic->data[i]=NULL;

//        pic->base[i]=NULL;

    }

//printf("R%X\n", pic->opaque);

    if(s->debug&FF_DEBUG_BUFFERS)

        av_log(s, AV_LOG_DEBUG, "default_release_buffer called on pic %p, %d buffers used\n", pic, s->internal_buffer_count);

}

int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){

    AVFrame temp_pic;

    int i;

    /* If no picture return a new buffer */

    if(pic->data[0] == NULL) {

        /* We will copy from buffer, so must be readable */

        pic->buffer_hints |= FF_BUFFER_HINTS_READABLE;

        return s->get_buffer(s, pic);

    }

    /* If internal buffer type return the same buffer */

    if(pic->type == FF_BUFFER_TYPE_INTERNAL) {

        if(s->pkt) pic->pkt_pts= s->pkt->pts;

        else       pic->pkt_pts= AV_NOPTS_VALUE;

        pic->reordered_opaque= s->reordered_opaque;

        return 0;

    }

    /*

     * Not internal type and reget_buffer not overridden, emulate cr buffer

     */

    temp_pic = *pic;

    for(i = 0; i < 4; i++)

        pic->data[i] = pic->base[i] = NULL;

    pic->opaque = NULL;

    /* Allocate new frame */

    if (s->get_buffer(s, pic))

        return -1;

    /* Copy image data from old buffer to new buffer */

    av_picture_copy((AVPicture*)pic, (AVPicture*)&temp_pic, s->pix_fmt, s->width,

             s->height);

    s->release_buffer(s, &temp_pic); // Release old frame

    return 0;

}

int avcodec_default_execute(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2),void *arg, int *ret, int count, int size){

    int i;

    for(i=0; i<count; i++){

        int r= func(c, (char*)arg + i*size);

        if(ret) ret[i]= r;

    }

    return 0;

}

int avcodec_default_execute2(AVCodecContext *c, int (*func)(AVCodecContext *c2, void *arg2, int jobnr, int threadnr),void *arg, int *ret, int count){

    int i;

    for(i=0; i<count; i++){

        int r= func(c, arg, i, 0);

        if(ret) ret[i]= r;

    }

    return 0;

}

enum PixelFormat avcodec_default_get_format(struct AVCodecContext *s, const enum PixelFormat *fmt){

    while (*fmt != PIX_FMT_NONE && ff_is_hwaccel_pix_fmt(*fmt))

        ++fmt;

    return fmt[0];

}

void avcodec_get_frame_defaults(AVFrame *pic){

    memset(pic, 0, sizeof(AVFrame));

    pic->pts = pic->best_effort_timestamp = AV_NOPTS_VALUE;

    pic->key_frame= 1;

}

AVFrame *avcodec_alloc_frame(void){

    AVFrame *pic= av_malloc(sizeof(AVFrame));

    if(pic==NULL) return NULL;

    avcodec_get_frame_defaults(pic);

    return pic;

}

int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)

{

    int ret= -1;

    /* If there is a user-supplied mutex locking routine, call it. */

    if (ff_lockmgr_cb) {

        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))

            return -1;

    }

    entangled_thread_counter++;

    if(entangled_thread_counter != 1){

        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");

        goto end;

    }

    if(avctx->codec || !codec)

        goto end;

    if (codec->priv_data_size > 0) {

      if(!avctx->priv_data){

        avctx->priv_data = av_mallocz(codec->priv_data_size);

        if (!avctx->priv_data) {

            ret = AVERROR(ENOMEM);

            goto end;

        }

        if(codec->priv_class){ //this can be droped once all user apps use   avcodec_get_context_defaults3()

            *(AVClass**)avctx->priv_data= codec->priv_class;

            av_opt_set_defaults(avctx->priv_data);

        }

      }

    } else {

        avctx->priv_data = NULL;

    }

    if(avctx->coded_width && avctx->coded_height)

        avcodec_set_dimensions(avctx, avctx->coded_width, avctx->coded_height);

    else if(avctx->width && avctx->height)

        avcodec_set_dimensions(avctx, avctx->width, avctx->height);

    if ((avctx->coded_width || avctx->coded_height || avctx->width || avctx->height)

        && (  av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx) < 0

           || av_image_check_size(avctx->width,       avctx->height,       0, avctx) < 0)) {

        av_log(avctx, AV_LOG_WARNING, "ignoring invalid width/height values\n");

        avcodec_set_dimensions(avctx, 0, 0);

    }

    /* if the decoder init function was already called previously,

       free the already allocated subtitle_header before overwriting it */

    if (codec->decode)

        av_freep(&avctx->subtitle_header);

#define SANE_NB_CHANNELS 128U

    if (avctx->channels > SANE_NB_CHANNELS) {

        ret = AVERROR(EINVAL);

        goto free_and_end;

    }

    avctx->codec = codec;

    if ((avctx->codec_type == AVMEDIA_TYPE_UNKNOWN || avctx->codec_type == codec->type) &&

        avctx->codec_id == CODEC_ID_NONE) {

        avctx->codec_type = codec->type;

        avctx->codec_id   = codec->id;

    }

    if (avctx->codec_id != codec->id || (avctx->codec_type != codec->type

                           && avctx->codec_type != AVMEDIA_TYPE_ATTACHMENT)) {

        av_log(avctx, AV_LOG_ERROR, "codec type or id mismatches\n");

        goto free_and_end;

    }

    avctx->frame_number = 0;

    if (HAVE_THREADS && !avctx->thread_opaque) {

        ret = ff_thread_init(avctx, avctx->thread_count);

        if (ret < 0) {

            goto free_and_end;

        }

    }

    if (avctx->codec->max_lowres < avctx->lowres) {

        av_log(avctx, AV_LOG_ERROR, "The maximum value for lowres supported by the decoder is %d\n",

               avctx->codec->max_lowres);

        goto free_and_end;

    }

    avctx->pts_correction_num_faulty_pts =

    avctx->pts_correction_num_faulty_dts = 0;

    avctx->pts_correction_last_pts =

    avctx->pts_correction_last_dts = INT64_MIN;

    if(avctx->codec->init && !(avctx->active_thread_type&FF_THREAD_FRAME)){

        ret = avctx->codec->init(avctx);

        if (ret < 0) {

            goto free_and_end;

        }

    }

    ret=0;

end:

    entangled_thread_counter--;

    /* Release any user-supplied mutex. */

    if (ff_lockmgr_cb) {

        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);

    }

    return ret;

free_and_end:

    av_freep(&avctx->priv_data);

    avctx->codec= NULL;

    goto end;

}

int attribute_align_arg avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,

                         const short *samples)

{

    if(buf_size < FF_MIN_BUFFER_SIZE && 0){

        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");

        return -1;

    }

    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || samples){

        int ret = avctx->codec->encode(avctx, buf, buf_size, samples);

        avctx->frame_number++;

        return ret;

    }else

        return 0;

}

int attribute_align_arg avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,

                         const AVFrame *pict)

{

    if(buf_size < FF_MIN_BUFFER_SIZE){

        av_log(avctx, AV_LOG_ERROR, "buffer smaller than minimum size\n");

        return -1;

    }

    if(av_image_check_size(avctx->width, avctx->height, 0, avctx))

        return -1;

    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || pict){

        int ret = avctx->codec->encode(avctx, buf, buf_size, pict);

        avctx->frame_number++;

        emms_c(); //needed to avoid an emms_c() call before every return;

        return ret;

    }else

        return 0;

}

int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,

                            const AVSubtitle *sub)

{

    int ret;

    if(sub->start_display_time) {

        av_log(avctx, AV_LOG_ERROR, "start_display_time must be 0.\n");

        return -1;

    }

    if(sub->num_rects == 0 || !sub->rects)

        return -1;

    ret = avctx->codec->encode(avctx, buf, buf_size, sub);

    avctx->frame_number++;

    return ret;

}

/**

 * Attempt to guess proper monotonic timestamps for decoded video frames

 * which might have incorrect times. Input timestamps may wrap around, in

 * which case the output will as well.

 *

 * @param pts the pts field of the decoded AVPacket, as passed through

 * AVFrame.pkt_pts

 * @param dts the dts field of the decoded AVPacket

 * @return one of the input values, may be AV_NOPTS_VALUE

 */

static int64_t guess_correct_pts(AVCodecContext *ctx,

                                 int64_t reordered_pts, int64_t dts)

{

    int64_t pts = AV_NOPTS_VALUE;

    if (dts != AV_NOPTS_VALUE) {

        ctx->pts_correction_num_faulty_dts += dts <= ctx->pts_correction_last_dts;

        ctx->pts_correction_last_dts = dts;

    }

    if (reordered_pts != AV_NOPTS_VALUE) {

        ctx->pts_correction_num_faulty_pts += reordered_pts <= ctx->pts_correction_last_pts;

        ctx->pts_correction_last_pts = reordered_pts;

    }

    if ((ctx->pts_correction_num_faulty_pts<=ctx->pts_correction_num_faulty_dts || dts == AV_NOPTS_VALUE)

       && reordered_pts != AV_NOPTS_VALUE)

        pts = reordered_pts;

    else

        pts = dts;

    return pts;

}

#if FF_API_VIDEO_OLD

int attribute_align_arg avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,

                         int *got_picture_ptr,

                         const uint8_t *buf, int buf_size)

{

    AVPacket avpkt;

    av_init_packet(&avpkt);

    avpkt.data = buf;

    avpkt.size = buf_size;

    // HACK for CorePNG to decode as normal PNG by default

    avpkt.flags = AV_PKT_FLAG_KEY;

    return avcodec_decode_video2(avctx, picture, got_picture_ptr, &avpkt);

}

#endif

int attribute_align_arg avcodec_decode_video2(AVCodecContext *avctx, AVFrame *picture,

                         int *got_picture_ptr,

                         AVPacket *avpkt)

{

    int ret;

    *got_picture_ptr= 0;

    if((avctx->coded_width||avctx->coded_height) && av_image_check_size(avctx->coded_width, avctx->coded_height, 0, avctx))

        return -1;

    avctx->pkt = avpkt;

    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size || (avctx->active_thread_type&FF_THREAD_FRAME)){

        if (HAVE_PTHREADS && avctx->active_thread_type&FF_THREAD_FRAME)

             ret = ff_thread_decode_frame(avctx, picture, got_picture_ptr,

                                          avpkt);

        else {

            ret = avctx->codec->decode(avctx, picture, got_picture_ptr,

                              avpkt);

            picture->pkt_dts= avpkt->dts;

        }

        emms_c(); //needed to avoid an emms_c() call before every return;

        picture->best_effort_timestamp = guess_correct_pts(avctx,

                                                           picture->pkt_pts,

                                                           picture->pkt_dts);

        if (*got_picture_ptr)

            avctx->frame_number++;

    }else

        ret= 0;

    return ret;

}

#if FF_API_AUDIO_OLD

int attribute_align_arg avcodec_decode_audio2(AVCodecContext *avctx, int16_t *samples,

                         int *frame_size_ptr,

                         const uint8_t *buf, int buf_size)

{

    AVPacket avpkt;

    av_init_packet(&avpkt);

    avpkt.data = buf;

    avpkt.size = buf_size;

    return avcodec_decode_audio3(avctx, samples, frame_size_ptr, &avpkt);

}

#endif

int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,

                         int *frame_size_ptr,

                         AVPacket *avpkt)

{

    int ret;

    avctx->pkt = avpkt;

    if((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size){

        //FIXME remove the check below _after_ ensuring that all audio check that the available space is enough

        if(*frame_size_ptr < AVCODEC_MAX_AUDIO_FRAME_SIZE){

            av_log(avctx, AV_LOG_ERROR, "buffer smaller than AVCODEC_MAX_AUDIO_FRAME_SIZE\n");

            return -1;

        }

        if(*frame_size_ptr < FF_MIN_BUFFER_SIZE ||

        *frame_size_ptr < avctx->channels * avctx->frame_size * sizeof(int16_t)){

            av_log(avctx, AV_LOG_ERROR, "buffer %d too small\n", *frame_size_ptr);

            return -1;

        }

        ret = avctx->codec->decode(avctx, samples, frame_size_ptr, avpkt);

        avctx->frame_number++;

    }else{

        ret= 0;

        *frame_size_ptr=0;

    }

    return ret;

}

#if FF_API_SUBTITLE_OLD

int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,

                            int *got_sub_ptr,

                            const uint8_t *buf, int buf_size)

{

    AVPacket avpkt;

    av_init_packet(&avpkt);

    avpkt.data = buf;

    avpkt.size = buf_size;

    return avcodec_decode_subtitle2(avctx, sub, got_sub_ptr, &avpkt);

}

#endif

int avcodec_decode_subtitle2(AVCodecContext *avctx, AVSubtitle *sub,

                            int *got_sub_ptr,

                            AVPacket *avpkt)

{

    int ret;

    avctx->pkt = avpkt;

    *got_sub_ptr = 0;

    ret = avctx->codec->decode(avctx, sub, got_sub_ptr, avpkt);

    if (*got_sub_ptr)

        avctx->frame_number++;

    return ret;

}

void avsubtitle_free(AVSubtitle *sub)

{

    int i;

    for (i = 0; i < sub->num_rects; i++)

    {

        av_freep(&sub->rects[i]->pict.data[0]);

        av_freep(&sub->rects[i]->pict.data[1]);

        av_freep(&sub->rects[i]->pict.data[2]);

        av_freep(&sub->rects[i]->pict.data[3]);

        av_freep(&sub->rects[i]->text);

        av_freep(&sub->rects[i]->ass);

        av_freep(&sub->rects[i]);

    }

    av_freep(&sub->rects);

    memset(sub, 0, sizeof(AVSubtitle));

}

av_cold int avcodec_close(AVCodecContext *avctx)

{

    /* If there is a user-supplied mutex locking routine, call it. */

    if (ff_lockmgr_cb) {

        if ((*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_OBTAIN))

            return -1;

    }

    entangled_thread_counter++;

    if(entangled_thread_counter != 1){

        av_log(avctx, AV_LOG_ERROR, "insufficient thread locking around avcodec_open/close()\n");

        entangled_thread_counter--;

        return -1;

    }

    if (HAVE_THREADS && avctx->thread_opaque)

        ff_thread_free(avctx);

    if (avctx->codec && avctx->codec->close)

        avctx->codec->close(avctx);

    avcodec_default_free_buffers(avctx);

    avctx->coded_frame = NULL;

    av_freep(&avctx->priv_data);

    if(avctx->codec && avctx->codec->encode)

        av_freep(&avctx->extradata);

    avctx->codec = NULL;

    avctx->active_thread_type = 0;

    entangled_thread_counter--;

    /* Release any user-supplied mutex. */

    if (ff_lockmgr_cb) {

        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);

    }

    return 0;

}

AVCodec *avcodec_find_encoder(enum CodecID id)

{

    AVCodec *p, *experimental=NULL;

    p = first_avcodec;

    while (p) {

        if (p->encode != NULL && p->id == id) {

            if (p->capabilities & CODEC_CAP_EXPERIMENTAL && !experimental) {

                experimental = p;

            } else

                return p;

        }

        p = p->next;

    }

    return experimental;

}

AVCodec *avcodec_find_encoder_by_name(const char *name)

{

    AVCodec *p;

    if (!name)

        return NULL;

    p = first_avcodec;

    while (p) {

        if (p->encode != NULL && strcmp(name,p->name) == 0)

            return p;

        p = p->next;

    }

    return NULL;

}

AVCodec *avcodec_find_decoder(enum CodecID id)

{

    AVCodec *p;

    p = first_avcodec;

    while (p) {

        if (p->decode != NULL && p->id == id)

            return p;

        p = p->next;

    }

    return NULL;

}

AVCodec *avcodec_find_decoder_by_name(const char *name)

{

    AVCodec *p;

    if (!name)

        return NULL;

    p = first_avcodec;

    while (p) {

        if (p->decode != NULL && strcmp(name,p->name) == 0)

            return p;

        p = p->next;

    }

    return NULL;

}

static int get_bit_rate(AVCodecContext *ctx)

{

    int bit_rate;

    int bits_per_sample;

    switch(ctx->codec_type) {

    case AVMEDIA_TYPE_VIDEO:

    case AVMEDIA_TYPE_DATA:

    case AVMEDIA_TYPE_SUBTITLE:

    case AVMEDIA_TYPE_ATTACHMENT:

        bit_rate = ctx->bit_rate;

        break;

    case AVMEDIA_TYPE_AUDIO:

        bits_per_sample = av_get_bits_per_sample(ctx->codec_id);

        bit_rate = bits_per_sample ? ctx->sample_rate * ctx->channels * bits_per_sample : ctx->bit_rate;

        break;

    default:

        bit_rate = 0;

        break;

    }

    return bit_rate;

}

size_t av_get_codec_tag_string(char *buf, size_t buf_size, unsigned int codec_tag)

{

    int i, len, ret = 0;

    for (i = 0; i < 4; i++) {

        len = snprintf(buf, buf_size,

                       isprint(codec_tag&0xFF) ? "%c" : "[%d]", codec_tag&0xFF);

        buf      += len;

        buf_size  = buf_size > len ? buf_size - len : 0;

        ret      += len;

        codec_tag>>=8;

    }

    return ret;

}

void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)

{

    const char *codec_name;

    const char *profile = NULL;

    AVCodec *p;

    char buf1[32];

    int bitrate;

    AVRational display_aspect_ratio;

    if (encode)

        p = avcodec_find_encoder(enc->codec_id);

    else

        p = avcodec_find_decoder(enc->codec_id);

    if (p) {

        codec_name = p->name;

        profile = av_get_profile_name(p, enc->profile);

    } else if (enc->codec_id == CODEC_ID_MPEG2TS) {