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/*

 * AVPacket functions for libavcodec

 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard

 *

 * 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 

#include "libavutil/avassert.h"

#include "libavutil/common.h"

#include "libavutil/internal.h"

#include "libavutil/mem.h"

#include "avcodec.h"

#include "bytestream.h"

#include "internal.h"

#if FF_API_DESTRUCT_PACKET

void av_destruct_packet(AVPacket *pkt)

{

    av_free(pkt->data);

    pkt->data = NULL;

    pkt->size = 0;

}

/* a dummy destruct callback for the callers that assume AVPacket.destruct ==

 * NULL => static data */

static void dummy_destruct_packet(AVPacket *pkt)

{

    av_assert0(0);

}

#endif

void av_init_packet(AVPacket *pkt)

{

    pkt->pts                  = AV_NOPTS_VALUE;

    pkt->dts                  = AV_NOPTS_VALUE;

    pkt->pos                  = -1;

    pkt->duration             = 0;

    pkt->convergence_duration = 0;

    pkt->flags                = 0;

    pkt->stream_index         = 0;

#if FF_API_DESTRUCT_PACKET

FF_DISABLE_DEPRECATION_WARNINGS

    pkt->destruct             = NULL;

FF_ENABLE_DEPRECATION_WARNINGS

#endif

    pkt->buf                  = NULL;

    pkt->side_data            = NULL;

    pkt->side_data_elems      = 0;

}

static int packet_alloc(AVBufferRef **buf, int size)

{

    int ret;

    if ((unsigned)size >= (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)

        return AVERROR(EINVAL);

    ret = av_buffer_realloc(buf, size + FF_INPUT_BUFFER_PADDING_SIZE);

    if (ret < 0)

        return ret;

    memset((*buf)->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

    return 0;

}

int av_new_packet(AVPacket *pkt, int size)

{

    AVBufferRef *buf = NULL;

    int ret = packet_alloc(&buf, size);

    if (ret < 0)

        return ret;

    av_init_packet(pkt);

    pkt->buf      = buf;

    pkt->data     = buf->data;

    pkt->size     = size;

#if FF_API_DESTRUCT_PACKET

FF_DISABLE_DEPRECATION_WARNINGS

    pkt->destruct = dummy_destruct_packet;

FF_ENABLE_DEPRECATION_WARNINGS

#endif

    return 0;

}

void av_shrink_packet(AVPacket *pkt, int size)

{

    if (pkt->size <= size)

        return;

    pkt->size = size;

    memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

}

int av_grow_packet(AVPacket *pkt, int grow_by)

{

    int new_size;

    av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);

    if (!pkt->size)

        return av_new_packet(pkt, grow_by);

    if ((unsigned)grow_by >

        INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))

        return -1;

    new_size = pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE;

    if (pkt->buf) {

        int ret = av_buffer_realloc(&pkt->buf, new_size);

        if (ret < 0)

            return ret;

    } else {

        pkt->buf = av_buffer_alloc(new_size);

        if (!pkt->buf)

            return AVERROR(ENOMEM);

        memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));

#if FF_API_DESTRUCT_PACKET

FF_DISABLE_DEPRECATION_WARNINGS

        pkt->destruct = dummy_destruct_packet;

FF_ENABLE_DEPRECATION_WARNINGS

#endif

    }

    pkt->data  = pkt->buf->data;

    pkt->size += grow_by;

    memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);

    return 0;

}

int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)

{

    if (size >= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)

        return AVERROR(EINVAL);

    pkt->buf = av_buffer_create(data, size + FF_INPUT_BUFFER_PADDING_SIZE,

                                av_buffer_default_free, NULL, 0);

    if (!pkt->buf)

        return AVERROR(ENOMEM);

    pkt->data = data;

    pkt->size = size;

#if FF_API_DESTRUCT_PACKET

FF_DISABLE_DEPRECATION_WARNINGS

    pkt->destruct = dummy_destruct_packet;

FF_ENABLE_DEPRECATION_WARNINGS

#endif

    return 0;

}

#define ALLOC_MALLOC(data, size) data = av_malloc(size)

#define ALLOC_BUF(data, size)                \

do {                                         \

    av_buffer_realloc(&pkt->buf, size);      \

    data = pkt->buf ? pkt->buf->data : NULL; \

} while (0)

#define DUP_DATA(dst, src, size, padding, ALLOC)                        \

    do {                                                                \

        void *data;                                                     \

        if (padding) {                                                  \

            if ((unsigned)(size) >                                      \

                (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE)        \

                goto failed_alloc;                                      \

            ALLOC(data, size + FF_INPUT_BUFFER_PADDING_SIZE);           \

        } else {                                                        \

            ALLOC(data, size);                                          \

        }                                                               \

        if (!data)                                                      \

            goto failed_alloc;                                          \

        memcpy(data, src, size);                                        \

        if (padding)                                                    \

            memset((uint8_t *)data + size, 0,                           \

                   FF_INPUT_BUFFER_PADDING_SIZE);                       \

        dst = data;                                                     \

    } while (0)

/* Makes duplicates of data, side_data, but does not copy any other fields */

static int copy_packet_data(AVPacket *pkt, AVPacket *src, int dup)

{

    pkt->data      = NULL;

    pkt->side_data = NULL;

    if (pkt->buf) {

        AVBufferRef *ref = av_buffer_ref(src->buf);

        if (!ref)

            return AVERROR(ENOMEM);

        pkt->buf  = ref;

        pkt->data = ref->data;

    } else {

        DUP_DATA(pkt->data, src->data, pkt->size, 1, ALLOC_BUF);

    }

#if FF_API_DESTRUCT_PACKET

FF_DISABLE_DEPRECATION_WARNINGS

    pkt->destruct = dummy_destruct_packet;

FF_ENABLE_DEPRECATION_WARNINGS

#endif

    if (pkt->side_data_elems && dup)

        pkt->side_data = src->side_data;

    if (pkt->side_data_elems && !dup) {

        return av_copy_packet_side_data(pkt, src);

    }

    return 0;

failed_alloc:

    av_free_packet(pkt);

    return AVERROR(ENOMEM);

}

int av_copy_packet_side_data(AVPacket *pkt, AVPacket *src)

{

    if (src->side_data_elems) {

        int i;

        DUP_DATA(pkt->side_data, src->side_data,

                src->side_data_elems * sizeof(*src->side_data), 0, ALLOC_MALLOC);

        if (src != pkt) {

            memset(pkt->side_data, 0,

                   src->side_data_elems * sizeof(*src->side_data));

        }

        for (i = 0; i < src->side_data_elems; i++) {

            DUP_DATA(pkt->side_data[i].data, src->side_data[i].data,

                    src->side_data[i].size, 1, ALLOC_MALLOC);

            pkt->side_data[i].size = src->side_data[i].size;

            pkt->side_data[i].type = src->side_data[i].type;

        }

    }

    return 0;

failed_alloc:

    av_free_packet(pkt);

    return AVERROR(ENOMEM);

}

int av_dup_packet(AVPacket *pkt)

{

    AVPacket tmp_pkt;

FF_DISABLE_DEPRECATION_WARNINGS

    if (!pkt->buf && pkt->data

#if FF_API_DESTRUCT_PACKET

        && !pkt->destruct

#endif

        ) {

FF_ENABLE_DEPRECATION_WARNINGS

        tmp_pkt = *pkt;

        return copy_packet_data(pkt, &tmp_pkt, 1);

    }

    return 0;

}

int av_copy_packet(AVPacket *dst, AVPacket *src)

{

    *dst = *src;

    return copy_packet_data(dst, src, 0);

}

void av_packet_free_side_data(AVPacket *pkt)

{

    int i;

    for (i = 0; i < pkt->side_data_elems; i++)

        av_free(pkt->side_data[i].data);

    av_freep(&pkt->side_data);

    pkt->side_data_elems = 0;

}

void av_free_packet(AVPacket *pkt)

{

    if (pkt) {

FF_DISABLE_DEPRECATION_WARNINGS

        if (pkt->buf)

            av_buffer_unref(&pkt->buf);

#if FF_API_DESTRUCT_PACKET

        else if (pkt->destruct)

            pkt->destruct(pkt);

        pkt->destruct = NULL;

#endif

FF_ENABLE_DEPRECATION_WARNINGS

        pkt->data            = NULL;

        pkt->size            = 0;

        av_packet_free_side_data(pkt);

    }

}

uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,

                                 int size)

{

    int elems = pkt->side_data_elems;

    if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))

        return NULL;

    if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)

        return NULL;

    pkt->side_data = av_realloc(pkt->side_data,

                                (elems + 1) * sizeof(*pkt->side_data));

    if (!pkt->side_data)

        return NULL;

    pkt->side_data[elems].data = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);

    if (!pkt->side_data[elems].data)

        return NULL;

    pkt->side_data[elems].size = size;

    pkt->side_data[elems].type = type;

    pkt->side_data_elems++;

    return pkt->side_data[elems].data;

}

uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,

                                 int *size)

{

    int i;

    for (i = 0; i < pkt->side_data_elems; i++) {

        if (pkt->side_data[i].type == type) {

            if (size)

                *size = pkt->side_data[i].size;

            return pkt->side_data[i].data;

        }

    }

    return NULL;

}

#define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL

int av_packet_merge_side_data(AVPacket *pkt){

    if(pkt->side_data_elems){

        AVBufferRef *buf;

        int i;

        uint8_t *p;

        uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;

        AVPacket old= *pkt;

        for (i=0; i

            size += old.side_data[i].size + 5LL;

        }

        if (size > INT_MAX)

            return AVERROR(EINVAL);

        buf = av_buffer_alloc(size);

        if (!buf)

            return AVERROR(ENOMEM);

        pkt->buf = buf;

        pkt->data = p = buf->data;

#if FF_API_DESTRUCT_PACKET

FF_DISABLE_DEPRECATION_WARNINGS

        pkt->destruct = dummy_destruct_packet;

FF_ENABLE_DEPRECATION_WARNINGS

#endif

        pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;

        bytestream_put_buffer(&p, old.data, old.size);

        for (i=old.side_data_elems-1; i>=0; i--) {

            bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);

            bytestream_put_be32(&p, old.side_data[i].size);

            *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);

        }

        bytestream_put_be64(&p, FF_MERGE_MARKER);

        av_assert0(p-pkt->data == pkt->size);

        memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);

        av_free_packet(&old);

        pkt->side_data_elems = 0;

        pkt->side_data = NULL;

        return 1;

    }

    return 0;

}

int av_packet_split_side_data(AVPacket *pkt){

    if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){

        int i;

        unsigned int size, orig_pktsize = pkt->size;

        uint8_t *p;

        p = pkt->data + pkt->size - 8 - 5;

        for (i=1; ; i++){

            size = AV_RB32(p);

            if (size>INT_MAX || p - pkt->data < size)

                return 0;

            if (p[4]&128)

                break;

            p-= size+5;

        }

        pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));

        if (!pkt->side_data)

            return AVERROR(ENOMEM);

        p= pkt->data + pkt->size - 8 - 5;

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

            size= AV_RB32(p);

            av_assert0(size<=INT_MAX && p - pkt->data >= size);

            pkt->side_data[i].data = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);

            pkt->side_data[i].size = size;

            pkt->side_data[i].type = p[4]&127;

            if (!pkt->side_data[i].data)

                return AVERROR(ENOMEM);

            memcpy(pkt->side_data[i].data, p-size, size);

            pkt->size -= size + 5;

            if(p[4]&128)

                break;

            p-= size+5;

        }

        pkt->size -= 8;

        /* FFMIN() prevents overflow in case the packet wasn't allocated with

         * proper padding.

         * If the side data is smaller than the buffer padding size, the

         * remaining bytes should have already been filled with zeros by the

         * original packet allocation anyway. */

        memset(pkt->data + pkt->size, 0,

               FFMIN(orig_pktsize - pkt->size, FF_INPUT_BUFFER_PADDING_SIZE));

        pkt->side_data_elems = i+1;

        return 1;

    }

    return 0;

}

int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,

                               int size)

{

    int i;

    for (i = 0; i < pkt->side_data_elems; i++) {

        if (pkt->side_data[i].type == type) {

            if (size > pkt->side_data[i].size)

                return AVERROR(ENOMEM);

            pkt->side_data[i].size = size;

            return 0;

        }

    }

    return AVERROR(ENOENT);

}

int av_packet_copy_props(AVPacket *dst, const AVPacket *src)

{

    int i;

    dst->pts                  = src->pts;

    dst->dts                  = src->dts;

    dst->pos                  = src->pos;

    dst->duration             = src->duration;

    dst->convergence_duration = src->convergence_duration;

    dst->flags                = src->flags;

    dst->stream_index         = src->stream_index;

    dst->side_data_elems      = src->side_data_elems;

    for (i = 0; i < src->side_data_elems; i++) {

         enum AVPacketSideDataType type = src->side_data[i].type;

         int size          = src->side_data[i].size;

         uint8_t *src_data = src->side_data[i].data;

         uint8_t *dst_data = av_packet_new_side_data(dst, type, size);

        if (!dst_data) {

            av_packet_free_side_data(dst);

            return AVERROR(ENOMEM);

        }

        memcpy(dst_data, src_data, size);

    }

    return 0;

}

void av_packet_unref(AVPacket *pkt)

{

    av_packet_free_side_data(pkt);

    av_buffer_unref(&pkt->buf);

    av_init_packet(pkt);

    pkt->data = NULL;

    pkt->size = 0;

}

int av_packet_ref(AVPacket *dst, AVPacket *src)

{

    int ret;

    ret = av_packet_copy_props(dst, src);

    if (ret < 0)

        return ret;

    if (!src->buf) {

        ret = packet_alloc(&dst->buf, src->size);

        if (ret < 0)

            goto fail;

        memcpy(dst->buf->data, src->data, src->size);

    } else

        dst->buf = av_buffer_ref(src->buf);

    dst->size = src->size;

    dst->data = dst->buf->data;

    return 0;

fail:

    av_packet_free_side_data(dst);

    return ret;

}

void av_packet_move_ref(AVPacket *dst, AVPacket *src)

{

    *dst = *src;

    av_init_packet(src);

}