utils.c

/*
 * utils for libavcodec
 * Copyright (c) 2001 Fabrice Bellard
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of Libav.
 *
 * 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.
 *
 * 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 Libav; 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/crc.h"
#include "libavutil/mathematics.h"
#include "libavutil/pixdesc.h"
#include "libavutil/audioconvert.h"
#include "libavutil/imgutils.h"
#include "libavutil/samplefmt.h"
#include "libavutil/dict.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;
static void *avformat_mutex;

void *av_fast_realloc(void *ptr, unsigned int *size, size_t 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, size_t 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;
}

#if !FF_API_AVCODEC_INIT
static
#endif
void avcodec_init(void)
{
    static int initialized = 0;

    if (initialized != 0)
        return;
    initialized = 1;

    dsputil_static_init();
}

void avcodec_register(AVCodec *codec)
{
    AVCodec **p;
    avcodec_init();
    p = &first_avcodec;
    while (*p != NULL) p = &(*p)->next;
    *p = codec;
    codec->next = NULL;

    if (codec->init_static_data)
        codec->init_static_data(codec);
}

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);
}

#define INTERNAL_BUFFER_SIZE (32+1)

void avcodec_align_dimensions2(AVCodecContext *s, int *width, int *height,
                               int linesize_align[AV_NUM_DATA_POINTERS])
{
    int i;
    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_GBRP:
    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:
    case PIX_FMT_YUV420P9LE:
    case PIX_FMT_YUV420P9BE:
    case PIX_FMT_YUV420P10LE:
    case PIX_FMT_YUV420P10BE:
    case PIX_FMT_YUV422P9LE:
    case PIX_FMT_YUV422P9BE:
    case PIX_FMT_YUV422P10LE:
    case PIX_FMT_YUV422P10BE:
    case PIX_FMT_YUV444P9LE:
    case PIX_FMT_YUV444P9BE:
    case PIX_FMT_YUV444P10LE:
    case PIX_FMT_YUV444P10BE:
    case PIX_FMT_GBRP9LE:
    case PIX_FMT_GBRP9BE:
    case PIX_FMT_GBRP10LE:
    case PIX_FMT_GBRP10BE:
        w_align = 16; //FIXME assume 16 pixel per macroblock
        h_align = 16 * 2; // interlaced needs 2 macroblocks height
        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

    for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
        linesize_align[i] = 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) {
        for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
            linesize_align[i] = 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[AV_NUM_DATA_POINTERS];
    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);
}

static int audio_get_buffer(AVCodecContext *avctx, AVFrame *frame)
{
    AVCodecInternal *avci = avctx->internal;
    InternalBuffer *buf;
    int buf_size, ret, i, needs_extended_data;

    buf_size = av_samples_get_buffer_size(NULL, avctx->channels,
                                          frame->nb_samples, avctx->sample_fmt,
                                          32);
    if (buf_size < 0)
        return AVERROR(EINVAL);

    needs_extended_data = av_sample_fmt_is_planar(avctx->sample_fmt) &&
                          avctx->channels > AV_NUM_DATA_POINTERS;

    /* allocate InternalBuffer if needed */
    if (!avci->buffer) {
        avci->buffer = av_mallocz(sizeof(InternalBuffer));
        if (!avci->buffer)
            return AVERROR(ENOMEM);
    }
    buf = avci->buffer;

    /* if there is a previously-used internal buffer, check its size and
       channel count to see if we can reuse it */
    if (buf->extended_data) {
        /* if current buffer is too small, free it */
        if (buf->extended_data[0] && buf_size > buf->audio_data_size) {
            av_free(buf->extended_data[0]);
            if (buf->extended_data != buf->data)
                av_free(&buf->extended_data);
            buf->extended_data = NULL;
            buf->data[0] = NULL;
        }
        /* if number of channels has changed, reset and/or free extended data
           pointers but leave data buffer in buf->data[0] for reuse */
        if (buf->nb_channels != avctx->channels) {
            if (buf->extended_data != buf->data)
                av_free(buf->extended_data);
            buf->extended_data = NULL;
        }
    }

    /* if there is no previous buffer or the previous buffer cannot be used
       as-is, allocate a new buffer and/or rearrange the channel pointers */
    if (!buf->extended_data) {
        /* if the channel pointers will fit, just set extended_data to data,
           otherwise allocate the extended_data channel pointers */
        if (needs_extended_data) {
            buf->extended_data = av_mallocz(avctx->channels *
                                            sizeof(*buf->extended_data));
            if (!buf->extended_data)
                return AVERROR(ENOMEM);
        } else {
            buf->extended_data = buf->data;
        }

        /* if there is a previous buffer and it is large enough, reuse it and
           just fill-in new channel pointers and linesize, otherwise allocate
           a new buffer */
        if (buf->extended_data[0]) {
            ret = av_samples_fill_arrays(buf->extended_data, &buf->linesize[0],
                                         buf->extended_data[0], avctx->channels,
                                         frame->nb_samples, avctx->sample_fmt,
                                         32);
        } else {
            ret = av_samples_alloc(buf->extended_data, &buf->linesize[0],
                                   avctx->channels, frame->nb_samples,
                                   avctx->sample_fmt, 32);
        }
        if (ret)
            return ret;

        /* if data was not used for extended_data, we need to copy as many of
           the extended_data channel pointers as will fit */
        if (needs_extended_data) {
            for (i = 0; i < AV_NUM_DATA_POINTERS; i++)
                buf->data[i] = buf->extended_data[i];
        }
        buf->audio_data_size = buf_size;
        buf->nb_channels     = avctx->channels;
    }

    /* copy InternalBuffer info to the AVFrame */
    frame->type          = FF_BUFFER_TYPE_INTERNAL;
    frame->extended_data = buf->extended_data;
    frame->linesize[0]   = buf->linesize[0];
    memcpy(frame->data, buf->data, sizeof(frame->data));

    if (avctx->pkt) frame->pkt_pts = avctx->pkt->pts;
    else            frame->pkt_pts = AV_NOPTS_VALUE;
    frame->reordered_opaque = avctx->reordered_opaque;

    if (avctx->debug & FF_DEBUG_BUFFERS)
        av_log(avctx, AV_LOG_DEBUG, "default_get_buffer called on frame %p, "
               "internal audio buffer used\n", frame);

    return 0;
}

static int video_get_buffer(AVCodecContext *s, AVFrame *pic)
{
    int i;
    int w= s->width;
    int h= s->height;
    InternalBuffer *buf;
    AVCodecInternal *avci = s->internal;

    if(pic->data[0]!=NULL) {
        av_log(s, AV_LOG_ERROR, "pic->data[0]!=NULL in avcodec_default_get_buffer\n");
        return -1;
    }
    if(avci->buffer_count >= INTERNAL_BUFFER_SIZE) {
        av_log(s, AV_LOG_ERROR, "buffer_count overflow (missing release_buffer?)\n");
        return -1;
    }

    if(av_image_check_size(w, h, 0, s))
        return -1;

    if (!avci->buffer) {
        avci->buffer = av_mallocz((INTERNAL_BUFFER_SIZE+1) *
                                  sizeof(InternalBuffer));
    }

    buf = &avci->buffer[avci->buffer_count];

    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 < AV_NUM_DATA_POINTERS; i++) {
            av_freep(&buf->base[i]);
            buf->data[i]= NULL;
        }
    }

    if (!buf->base[0]) {
        int h_chroma_shift, v_chroma_shift;
        int size[4] = {0};
        int tmpsize;
        int unaligned;
        AVPicture picture;
        int stride_align[AV_NUM_DATA_POINTERS];
        const int pixel_size = av_pix_fmt_descriptors[s->pix_fmt].comp[0].step_minus1+1;

        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]);

        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) + (pixel_size*EDGE_WIDTH>>h_shift), stride_align[i]);
        }
        for (; i < AV_NUM_DATA_POINTERS; i++) {
            buf->base[i] = buf->data[i] = NULL;
            buf->linesize[i] = 0;
        }
        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->type= FF_BUFFER_TYPE_INTERNAL;

    for (i = 0; i < AV_NUM_DATA_POINTERS; i++) {
        pic->base[i]= buf->base[i];
        pic->data[i]= buf->data[i];
        pic->linesize[i]= buf->linesize[i];
    }
    pic->extended_data = pic->data;
    avci->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, avci->buffer_count);

    return 0;
}

int avcodec_default_get_buffer(AVCodecContext *avctx, AVFrame *frame)
{
    switch (avctx->codec_type) {
    case AVMEDIA_TYPE_VIDEO:
        return video_get_buffer(avctx, frame);
    case AVMEDIA_TYPE_AUDIO:
        return audio_get_buffer(avctx, frame);
    default:
        return -1;
    }
}

void avcodec_default_release_buffer(AVCodecContext *s, AVFrame *pic){
    int i;
    InternalBuffer *buf, *last;
    AVCodecInternal *avci = s->internal;

    assert(s->codec_type == AVMEDIA_TYPE_VIDEO);

    assert(pic->type==FF_BUFFER_TYPE_INTERNAL);
    assert(avci->buffer_count);

    if (avci->buffer) {
        buf = NULL; /* avoids warning */
        for (i = 0; i < avci->buffer_count; i++) { //just 3-5 checks so is not worth to optimize
            buf = &avci->buffer[i];
            if (buf->data[0] == pic->data[0])
                break;
        }
        assert(i < avci->buffer_count);
        avci->buffer_count--;
        last = &avci->buffer[avci->buffer_count];

        if (buf != last)
            FFSWAP(InternalBuffer, *buf, *last);
    }

    for (i = 0; i < AV_NUM_DATA_POINTERS; 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, avci->buffer_count);
}

int avcodec_default_reget_buffer(AVCodecContext *s, AVFrame *pic){
    AVFrame temp_pic;
    int i;

    assert(s->codec_type == AVMEDIA_TYPE_VIDEO);

    /* 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 < AV_NUM_DATA_POINTERS; 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= 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;
}

#if FF_API_AVCODEC_OPEN
int attribute_align_arg avcodec_open(AVCodecContext *avctx, AVCodec *codec)
{
    return avcodec_open2(avctx, codec, NULL);
}
#endif

int attribute_align_arg avcodec_open2(AVCodecContext *avctx, AVCodec *codec, AVDictionary **options)
{
    int ret = 0;
    AVDictionary *tmp = NULL;

    if (options)
        av_dict_copy(&tmp, *options, 0);

    /* 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");
        ret = -1;
        goto end;
    }

    if(avctx->codec || !codec) {
        ret = AVERROR(EINVAL);
        goto end;
    }

    avctx->internal = av_mallocz(sizeof(AVCodecInternal));
    if (!avctx->internal) {
        ret = AVERROR(ENOMEM);
        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) {
            *(AVClass**)avctx->priv_data= codec->priv_class;
            av_opt_set_defaults(avctx->priv_data);
        }
      }
      if (codec->priv_class && (ret = av_opt_set_dict(avctx->priv_data, &tmp)) < 0)
          goto free_and_end;
    } else {
        avctx->priv_data = NULL;
    }
    if ((ret = av_opt_set_dict(avctx, &tmp)) < 0)
        goto free_and_end;

    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");
        ret = AVERROR(EINVAL);
        goto free_and_end;
    }
    avctx->frame_number = 0;
#if FF_API_ER

    av_log(avctx, AV_LOG_DEBUG, "err{or,}_recognition separate: %d; %d\n",
           avctx->error_recognition, avctx->err_recognition);
    /* FF_ER_CAREFUL (==1) implies AV_EF_CRCCHECK (== 1<<1 - 1),
       FF_ER_COMPLIANT (==2) implies AV_EF_{CRCCHECK,BITSTREAM} (== 1<<2 - 1), et cetera} */
    avctx->err_recognition |= (1<<(avctx->error_recognition-(avctx->error_recognition>=FF_ER_VERY_AGGRESSIVE))) - 1;
    av_log(avctx, AV_LOG_DEBUG, "err{or,}_recognition combined: %d; %d\n",
           avctx->error_recognition, avctx->err_recognition);
#endif

    if (HAVE_THREADS && !avctx->thread_opaque) {
        ret = ff_thread_init(avctx);
        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);
        ret = AVERROR(EINVAL);
        goto free_and_end;
    }
    if (avctx->codec->encode) {
        int i;
        if (avctx->codec->sample_fmts) {
            for (i = 0; avctx->codec->sample_fmts[i] != AV_SAMPLE_FMT_NONE; i++)
                if (avctx->sample_fmt == avctx->codec->sample_fmts[i])
                    break;
            if (avctx->codec->sample_fmts[i] == AV_SAMPLE_FMT_NONE) {
                av_log(avctx, AV_LOG_ERROR, "Specified sample_fmt is not supported.\n");
                ret = AVERROR(EINVAL);
                goto free_and_end;
            }
        }
        if (avctx->codec->supported_samplerates) {
            for (i = 0; avctx->codec->supported_samplerates[i] != 0; i++)
                if (avctx->sample_rate == avctx->codec->supported_samplerates[i])
                    break;
            if (avctx->codec->supported_samplerates[i] == 0) {
                av_log(avctx, AV_LOG_ERROR, "Specified sample_rate is not supported\n");
                ret = AVERROR(EINVAL);
                goto free_and_end;
            }
        }
        if (avctx->codec->channel_layouts) {
            if (!avctx->channel_layout) {
                av_log(avctx, AV_LOG_WARNING, "channel_layout not specified\n");
            } else {
                for (i = 0; avctx->codec->channel_layouts[i] != 0; i++)
                    if (avctx->channel_layout == avctx->codec->channel_layouts[i])
                        break;
                if (avctx->codec->channel_layouts[i] == 0) {
                    av_log(avctx, AV_LOG_ERROR, "Specified channel_layout is not supported\n");
                    ret = AVERROR(EINVAL);
                    goto free_and_end;
                }
            }
        }
        if (avctx->channel_layout && avctx->channels) {
            if (av_get_channel_layout_nb_channels(avctx->channel_layout) != avctx->channels) {
                av_log(avctx, AV_LOG_ERROR, "channel layout does not match number of channels\n");
                ret = AVERROR(EINVAL);
                goto free_and_end;
            }
        } else if (avctx->channel_layout) {
            avctx->channels = av_get_channel_layout_nb_channels(avctx->channel_layout);
        }
    }

    if(avctx->codec->init && !(avctx->active_thread_type&FF_THREAD_FRAME)){
        ret = avctx->codec->init(avctx);
        if (ret < 0) {
            goto free_and_end;
        }
    }
end:
    entangled_thread_counter--;

    /* Release any user-supplied mutex. */
    if (ff_lockmgr_cb) {
        (*ff_lockmgr_cb)(&codec_mutex, AV_LOCK_RELEASE);
    }
    if (options) {
        av_dict_free(options);
        *options = tmp;
    }

    return ret;
free_and_end:
    av_dict_free(&tmp);
    av_freep(&avctx->priv_data);
    av_freep(&avctx->internal);
    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;
}

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_THREADS && 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;

        if (*got_picture_ptr)
            avctx->frame_number++;
    }else
        ret= 0;

    return ret;
}

#if FF_API_OLD_DECODE_AUDIO
int attribute_align_arg avcodec_decode_audio3(AVCodecContext *avctx, int16_t *samples,
                         int *frame_size_ptr,
                         AVPacket *avpkt)
{
    AVFrame frame;
    int ret, got_frame = 0;

    if (avctx->get_buffer != avcodec_default_get_buffer) {
        av_log(avctx, AV_LOG_ERROR, "A custom get_buffer() cannot be used with "
               "avcodec_decode_audio3()\n");
        return AVERROR(EINVAL);
    }

    ret = avcodec_decode_audio4(avctx, &frame, &got_frame, avpkt);

    if (ret >= 0 && got_frame) {
        int ch, plane_size;
        int planar = av_sample_fmt_is_planar(avctx->sample_fmt);
        int data_size = av_samples_get_buffer_size(&plane_size, avctx->channels,
                                                   frame.nb_samples,
                                                   avctx->sample_fmt, 1);
        if (*frame_size_ptr < data_size) {
            av_log(avctx, AV_LOG_ERROR, "output buffer size is too small for "
                   "the current frame (%d < %d)\n", *frame_size_ptr, data_size);
            return AVERROR(EINVAL);
        }

        memcpy(samples, frame.extended_data[0], plane_size);

        if (planar && avctx->channels > 1) {
            uint8_t *out = ((uint8_t *)samples) + plane_size;
            for (ch = 1; ch < avctx->channels; ch++) {
                memcpy(out, frame.extended_data[ch], plane_size);
                out += plane_size;
            }
        }
        *frame_size_ptr = data_size;
    } else {
        *frame_size_ptr = 0;
    }
    return ret;
}
#endif

int attribute_align_arg avcodec_decode_audio4(AVCodecContext *avctx,
                                              AVFrame *frame,
                                              int *got_frame_ptr,
                                              AVPacket *avpkt)
{
    int ret = 0;

    *got_frame_ptr = 0;

    avctx->pkt = avpkt;

    if (!avpkt->data && avpkt->size) {
        av_log(avctx, AV_LOG_ERROR, "invalid packet: NULL data, size != 0\n");
        return AVERROR(EINVAL);
    }

    if ((avctx->codec->capabilities & CODEC_CAP_DELAY) || avpkt->size) {
        ret = avctx->codec->decode(avctx, frame, got_frame_ptr, avpkt);
        if (ret >= 0 && *got_frame_ptr) {
            avctx->frame_number++;
            frame->pkt_dts = avpkt->dts;
        }
    }
    return ret;
}

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->internal);
    if (avctx->codec && avctx->codec->priv_class)
        av_opt_free(avctx->priv_data);