/* * 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 <string.h> #include "libavutil/avassert.h"#include "libavutil/common.h"#include "libavutil/internal.h"#include "libavutil/mathematics.h"#include "libavutil/mem.h"#include "avcodec.h"#include "bytestream.h"#include "internal.h" void av_init_packet(AVPacket *pkt){    pkt->pts                  = AV_NOPTS_VALUE;    pkt->dts                  = AV_NOPTS_VALUE;    pkt->pos                  = -1;    pkt->duration             = 0;#if FF_API_CONVERGENCE_DURATIONFF_DISABLE_DEPRECATION_WARNINGS    pkt->convergence_duration = 0;FF_ENABLE_DEPRECATION_WARNINGS#endif    pkt->flags                = 0;    pkt->stream_index         = 0;    pkt->buf                  = NULL;    pkt->side_data            = NULL;    pkt->side_data_elems      = 0;} AVPacket *av_packet_alloc(void){    AVPacket *pkt = av_mallocz(sizeof(AVPacket));    if (!pkt)        return pkt;     av_packet_unref(pkt);     return pkt;} void av_packet_free(AVPacket **pkt){    if (!pkt || !*pkt)        return;     av_packet_unref(*pkt);    av_freep(pkt);} static int packet_alloc(AVBufferRef **buf, int size){    int ret;    if (size < 0 || size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)        return AVERROR(EINVAL);     ret = av_buffer_realloc(buf, size + AV_INPUT_BUFFER_PADDING_SIZE);    if (ret < 0)        return ret;     memset((*buf)->data + size, 0, AV_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;     return 0;} void av_shrink_packet(AVPacket *pkt, int size){    if (pkt->size <= size)        return;    pkt->size = size;    memset(pkt->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);} int av_grow_packet(AVPacket *pkt, int grow_by){    int new_size;    av_assert0((unsigned)pkt->size <= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE);    if ((unsigned)grow_by >        INT_MAX - (pkt->size + AV_INPUT_BUFFER_PADDING_SIZE))        return -1;     new_size = pkt->size + grow_by + AV_INPUT_BUFFER_PADDING_SIZE;    if (pkt->buf) {        size_t data_offset;        uint8_t *old_data = pkt->data;        if (pkt->data == NULL) {            data_offset = 0;            pkt->data = pkt->buf->data;        } else {            data_offset = pkt->data - pkt->buf->data;            if (data_offset > INT_MAX - new_size)                return -1;        }         if (new_size + data_offset > pkt->buf->size) {            int ret = av_buffer_realloc(&pkt->buf, new_size + data_offset);            if (ret < 0) {                pkt->data = old_data;                return ret;            }            pkt->data = pkt->buf->data + data_offset;        }    } else {        pkt->buf = av_buffer_alloc(new_size);        if (!pkt->buf)            return AVERROR(ENOMEM);        if (pkt->size > 0)            memcpy(pkt->buf->data, pkt->data, pkt->size);        pkt->data = pkt->buf->data;    }    pkt->size += grow_by;    memset(pkt->data + pkt->size, 0, AV_INPUT_BUFFER_PADDING_SIZE);     return 0;} int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size){    if (size >= INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)        return AVERROR(EINVAL);     pkt->buf = av_buffer_create(data, size + AV_INPUT_BUFFER_PADDING_SIZE,                                av_buffer_default_free, NULL, 0);    if (!pkt->buf)        return AVERROR(ENOMEM);     pkt->data = data;    pkt->size = size;     return 0;} #if FF_API_AVPACKET_OLD_APIFF_DISABLE_DEPRECATION_WARNINGS#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) + AV_INPUT_BUFFER_PADDING_SIZE)        \                goto failed_alloc;                                      \            ALLOC(data, size + AV_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,                           \                   AV_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, const AVPacket *src, int dup){    pkt->data      = NULL;    pkt->side_data = NULL;    pkt->side_data_elems = 0;    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 (src->side_data_elems && dup) {        pkt->side_data = src->side_data;        pkt->side_data_elems = src->side_data_elems;    }    if (src->side_data_elems && !dup) {        return av_copy_packet_side_data(pkt, src);    }    return 0; failed_alloc:    av_packet_unref(pkt);    return AVERROR(ENOMEM);} int av_copy_packet_side_data(AVPacket *pkt, const 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;        }    }    pkt->side_data_elems = src->side_data_elems;    return 0; failed_alloc:    av_packet_unref(pkt);    return AVERROR(ENOMEM);}FF_ENABLE_DEPRECATION_WARNINGS#endif int av_dup_packet(AVPacket *pkt){    AVPacket tmp_pkt;     if (!pkt->buf && pkt->data) {        tmp_pkt = *pkt;        return copy_packet_data(pkt, &tmp_pkt, 1);    }    return 0;} int av_copy_packet(AVPacket *dst, const 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_freep(&pkt->side_data[i].data);    av_freep(&pkt->side_data);    pkt->side_data_elems = 0;} #if FF_API_AVPACKET_OLD_APIFF_DISABLE_DEPRECATION_WARNINGSvoid av_free_packet(AVPacket *pkt){    if (pkt) {        if (pkt->buf)            av_buffer_unref(&pkt->buf);        pkt->data            = NULL;        pkt->size            = 0;         av_packet_free_side_data(pkt);    }}FF_ENABLE_DEPRECATION_WARNINGS#endif int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,                            uint8_t *data, size_t size){    AVPacketSideData *tmp;    int elems = pkt->side_data_elems;     if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))        return AVERROR(ERANGE);     tmp = av_realloc(pkt->side_data, (elems + 1) * sizeof(*tmp));    if (!tmp)        return AVERROR(ENOMEM);     pkt->side_data = tmp;    pkt->side_data[elems].data = data;    pkt->side_data[elems].size = size;    pkt->side_data[elems].type = type;    pkt->side_data_elems++;     return 0;}  uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,                                 int size){    int ret;    uint8_t *data;     if ((unsigned)size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)        return NULL;    data = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);    if (!data)        return NULL;     ret = av_packet_add_side_data(pkt, type, data, size);    if (ret < 0) {        av_freep(&data);        return NULL;    }     return 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;        }    }    if (size)        *size = 0;    return NULL;} const char *av_packet_side_data_name(enum AVPacketSideDataType type){    switch(type) {    case AV_PKT_DATA_PALETTE:                    return "Palette";    case AV_PKT_DATA_NEW_EXTRADATA:              return "New Extradata";    case AV_PKT_DATA_PARAM_CHANGE:               return "Param Change";    case AV_PKT_DATA_H263_MB_INFO:               return "H263 MB Info";    case AV_PKT_DATA_REPLAYGAIN:                 return "Replay Gain";    case AV_PKT_DATA_DISPLAYMATRIX:              return "Display Matrix";    case AV_PKT_DATA_STEREO3D:                   return "Stereo 3D";    case AV_PKT_DATA_AUDIO_SERVICE_TYPE:         return "Audio Service Type";    case AV_PKT_DATA_SKIP_SAMPLES:               return "Skip Samples";    case AV_PKT_DATA_JP_DUALMONO:                return "JP Dual Mono";    case AV_PKT_DATA_STRINGS_METADATA:           return "Strings Metadata";    case AV_PKT_DATA_SUBTITLE_POSITION:          return "Subtitle Position";    case AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL:   return "Matroska BlockAdditional";    case AV_PKT_DATA_WEBVTT_IDENTIFIER:          return "WebVTT ID";    case AV_PKT_DATA_WEBVTT_SETTINGS:            return "WebVTT Settings";    case AV_PKT_DATA_METADATA_UPDATE:            return "Metadata Update";    case AV_PKT_DATA_MPEGTS_STREAM_ID:           return "MPEGTS Stream ID";    case AV_PKT_DATA_MASTERING_DISPLAY_METADATA: return "Mastering display metadata";    case AV_PKT_DATA_SPHERICAL:                  return "Spherical Mapping";    }    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 + AV_INPUT_BUFFER_PADDING_SIZE;        AVPacket old= *pkt;        for (i=0; i<old.side_data_elems; 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;        pkt->size = size - AV_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, AV_INPUT_BUFFER_PADDING_SIZE);        av_packet_unref(&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;        uint8_t *p;         p = pkt->data + pkt->size - 8 - 5;        for (i=1; ; i++){            size = AV_RB32(p);            if (size>INT_MAX - 5 || p - pkt->data < size)                return 0;            if (p[4]&128)                break;            if (p - pkt->data < size + 5)                return 0;            p-= size+5;        }         pkt->side_data = av_malloc_array(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 - 5 && p - pkt->data >= size);            pkt->side_data[i].data = av_mallocz(size + AV_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;        pkt->side_data_elems = i+1;        return 1;    }    return 0;} uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size){    AVDictionaryEntry *t = NULL;    uint8_t *data = NULL;    *size = 0;     if (!dict)        return NULL;     while ((t = av_dict_get(dict, "", t, AV_DICT_IGNORE_SUFFIX))) {        const size_t keylen   = strlen(t->key);        const size_t valuelen = strlen(t->value);        const size_t new_size = *size + keylen + 1 + valuelen + 1;        uint8_t *const new_data = av_realloc(data, new_size);         if (!new_data)            goto fail;        data = new_data;        if (new_size > INT_MAX)            goto fail;         memcpy(data + *size, t->key, keylen + 1);        memcpy(data + *size + keylen + 1, t->value, valuelen + 1);         *size = new_size;    }     return data; fail:    av_freep(&data);    *size = 0;    return NULL;} int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict){    const uint8_t *end = data + size;

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