/*

 * 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/avutil.h"

#include "libavutil/container_fifo.h"

#include "libavutil/mathematics.h"

#include "libavutil/mem.h"

#include "libavutil/rational.h"

#include "defs.h"

#include "packet.h"

#include "packet_internal.h"

#if FF_API_INIT_PACKET

void av_init_packet(AVPacket *pkt)

{

    pkt->pts                  = AV_NOPTS_VALUE;

    pkt->dts                  = AV_NOPTS_VALUE;

    pkt->pos                  = -1;

    pkt->duration             = 0;

    pkt->flags                = 0;

    pkt->stream_index         = 0;

    pkt->buf                  = NULL;

    pkt->side_data            = NULL;

    pkt->side_data_elems      = 0;

    pkt->opaque               = NULL;

    pkt->opaque_ref           = NULL;

    pkt->time_base            = av_make_q(0, 1);

}

#endif

static void get_packet_defaults(AVPacket *pkt)

{

    memset(pkt, 0, sizeof(*pkt));

    pkt->pts             = AV_NOPTS_VALUE;

    pkt->dts             = AV_NOPTS_VALUE;

    pkt->pos             = -1;

    pkt->time_base       = av_make_q(0, 1);

}

AVPacket *av_packet_alloc(void)

{

    AVPacket *pkt = av_malloc(sizeof(AVPacket));

    if (!pkt)

        return pkt;

    get_packet_defaults(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;

    get_packet_defaults(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 AVERROR(ENOMEM);

    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 AVERROR(ENOMEM);

        }

        if (new_size + data_offset > pkt->buf->size ||

            !av_buffer_is_writable(pkt->buf)) {

            int ret;

            // allocate slightly more than requested to avoid excessive

            // reallocations

            if (new_size + data_offset < INT_MAX - new_size/16)

                new_size += new_size/16;

            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;

}

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;

}

int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type,

                            uint8_t *data, size_t size)

{

    AVPacketSideData *tmp;

    int i, elems = pkt->side_data_elems;

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

        AVPacketSideData *sd = &pkt->side_data[i];

        if (sd->type == type) {

            av_free(sd->data);

            sd->data = data;

            sd->size = size;

            return 0;

        }

    }

    if ((unsigned)elems + 1 > AV_PKT_DATA_NB)

        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,

                                 size_t size)

{

    int ret;

    uint8_t *data;

    if (size > SIZE_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(const AVPacket *pkt, enum AVPacketSideDataType type,

                                 size_t *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_QUALITY_STATS:              return "Quality stats";

    case AV_PKT_DATA_FALLBACK_TRACK:             return "Fallback track";

    case AV_PKT_DATA_CPB_PROPERTIES:             return "CPB properties";

    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_CONTENT_LIGHT_LEVEL:        return "Content light level metadata";

    case AV_PKT_DATA_SPHERICAL:                  return "Spherical Mapping";

    case AV_PKT_DATA_A53_CC:                     return "A53 Closed Captions";

    case AV_PKT_DATA_ENCRYPTION_INIT_INFO:       return "Encryption initialization data";

    case AV_PKT_DATA_ENCRYPTION_INFO:            return "Encryption info";

    case AV_PKT_DATA_AFD:                        return "Active Format Description data";

    case AV_PKT_DATA_PRFT:                       return "Producer Reference Time";

    case AV_PKT_DATA_ICC_PROFILE:                return "ICC Profile";

    case AV_PKT_DATA_DOVI_CONF:                  return "DOVI configuration record";

    case AV_PKT_DATA_S12M_TIMECODE:              return "SMPTE ST 12-1:2014 timecode";

    case AV_PKT_DATA_DYNAMIC_HDR10_PLUS:         return "HDR10+ Dynamic Metadata (SMPTE 2094-40)";

    case AV_PKT_DATA_DYNAMIC_HDR_SMPTE_2094_APP5:return "HDR Dynamic Metadata (SMPTE 2094-50)";

    case AV_PKT_DATA_AMBIENT_VIEWING_ENVIRONMENT:return "Ambient viewing environment";

    case AV_PKT_DATA_IAMF_MIX_GAIN_PARAM:        return "IAMF Mix Gain Parameter Data";

    case AV_PKT_DATA_IAMF_DEMIXING_INFO_PARAM:   return "IAMF Demixing Info Parameter Data";

    case AV_PKT_DATA_IAMF_RECON_GAIN_INFO_PARAM: return "IAMF Recon Gain Info Parameter Data";

    case AV_PKT_DATA_FRAME_CROPPING:             return "Frame Cropping";

    case AV_PKT_DATA_LCEVC:                      return "LCEVC NAL data";

    case AV_PKT_DATA_3D_REFERENCE_DISPLAYS:      return "3D Reference Displays Info";

    case AV_PKT_DATA_RTCP_SR:                    return "RTCP Sender Report";

    case AV_PKT_DATA_EXIF:                       return "EXIF metadata";

    case AV_PKT_DATA_HEVC_CONF:                  return "HEVC enhancement-layer decoder configuration";

    }

    return NULL;

}

uint8_t *av_packet_pack_dictionary(AVDictionary *dict, size_t *size)

{

    uint8_t *data = NULL;

    *size = 0;

    if (!dict)

        return NULL;

    for (int pass = 0; pass < 2; pass++) {

        const AVDictionaryEntry *t = NULL;

        size_t total_length = 0;

        while ((t = av_dict_iterate(dict, t))) {

            for (int i = 0; i < 2; i++) {

                const char  *str = i ? t->value : t->key;

                const size_t len = strlen(str) + 1;

                if (pass)

                    memcpy(data + total_length, str, len);

                else if (len > SIZE_MAX - total_length)

                    return NULL;

                total_length += len;

            }

        }

        if (pass)

            break;

        data = av_malloc(total_length);

        if (!data)

            return NULL;

        *size = total_length;

    }

    return data;

}

int av_packet_unpack_dictionary(const uint8_t *data, size_t size,

                                AVDictionary **dict)

{

    const uint8_t *end;

    int ret;

    if (!dict || !data || !size)

        return 0;

    end = data + size;

    if (end[-1])

        return AVERROR_INVALIDDATA;

    while (data < end) {

        const uint8_t *key = data;

        const uint8_t *val = data + strlen(key) + 1;

        if (val >= end || !*key)

            return AVERROR_INVALIDDATA;

        ret = av_dict_set(dict, key, val, 0);

        if (ret < 0)

            return ret;

        data = val + strlen(val) + 1;

    }

    return 0;

}

int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,

                               size_t 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, ret;

    dst->pts                  = src->pts;

    dst->dts                  = src->dts;

    dst->pos                  = src->pos;

    dst->duration             = src->duration;

    dst->flags                = src->flags;

    dst->stream_index         = src->stream_index;

    dst->opaque               = src->opaque;

    dst->time_base            = src->time_base;

    dst->opaque_ref           = NULL;

    dst->side_data            = NULL;

    dst->side_data_elems      = 0;

    ret = av_buffer_replace(&dst->opaque_ref, src->opaque_ref);

    if (ret < 0)

        return ret;

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

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

        size_t 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_buffer_unref(&dst->opaque_ref);

            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->opaque_ref);

    av_buffer_unref(&pkt->buf);

    get_packet_defaults(pkt);

}

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

{

    int ret;

    dst->buf = NULL;

    ret = av_packet_copy_props(dst, src);

    if (ret < 0)

        goto fail;

    if (!src->buf) {

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

        if (ret < 0)

            goto fail;

        av_assert1(!src->size || src->data);

        if (src->size)

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

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

    } else {

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

        if (!dst->buf) {

            ret = AVERROR(ENOMEM);

            goto fail;

        }

        dst->data = src->data;

    }

    dst->size = src->size;

    return 0;

fail:

    av_packet_unref(dst);

    return ret;

}

AVPacket *av_packet_clone(const AVPacket *src)

{

    AVPacket *ret = av_packet_alloc();

    if (!ret)

        return ret;

    if (av_packet_ref(ret, src))

        av_packet_free(&ret);

    return ret;

}

void av_packet_move_ref(AVPacket *dst, AVPacket *src)

{

    *dst = *src;

    get_packet_defaults(src);

}

int av_packet_make_refcounted(AVPacket *pkt)

{

    int ret;

    if (pkt->buf)

        return 0;

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

    if (ret < 0)

        return ret;

    av_assert1(!pkt->size || pkt->data);

    if (pkt->size)

        memcpy(pkt->buf->data, pkt->data, pkt->size);

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

    return 0;

}

int av_packet_make_writable(AVPacket *pkt)

{

    AVBufferRef *buf = NULL;

    int ret;

    if (pkt->buf && av_buffer_is_writable(pkt->buf))

        return 0;

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

    if (ret < 0)

        return ret;

    av_assert1(!pkt->size || pkt->data);

    if (pkt->size)

        memcpy(buf->data, pkt->data, pkt->size);

    av_buffer_unref(&pkt->buf);

    pkt->buf  = buf;

    pkt->data = buf->data;

    return 0;

}

void av_packet_rescale_ts(AVPacket *pkt, AVRational src_tb, AVRational dst_tb)

{

    if (pkt->pts != AV_NOPTS_VALUE)

        pkt->pts = av_rescale_q(pkt->pts, src_tb, dst_tb);

    if (pkt->dts != AV_NOPTS_VALUE)

        pkt->dts = av_rescale_q(pkt->dts, src_tb, dst_tb);

    if (pkt->duration > 0)

        pkt->duration = av_rescale_q(pkt->duration, src_tb, dst_tb);

}

int avpriv_packet_list_put(PacketList *packet_buffer,

                           AVPacket      *pkt,

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

                           int flags)

{

    PacketListEntry *pktl = av_malloc(sizeof(*pktl));

    unsigned int update_end_point = 1;

    int ret;

    if (!pktl)

        return AVERROR(ENOMEM);

    if (copy) {

        get_packet_defaults(&pktl->pkt);

        ret = copy(&pktl->pkt, pkt);

        if (ret < 0) {

            av_free(pktl);

            return ret;

        }

    } else {

        ret = av_packet_make_refcounted(pkt);

        if (ret < 0) {

            av_free(pktl);

            return ret;

        }

        av_packet_move_ref(&pktl->pkt, pkt);

    }

    pktl->next = NULL;

    if (packet_buffer->head) {

        if (flags & FF_PACKETLIST_FLAG_PREPEND) {

            pktl->next = packet_buffer->head;

            packet_buffer->head = pktl;

            update_end_point = 0;

        } else {

            packet_buffer->tail->next = pktl;

        }

    } else

        packet_buffer->head = pktl;

    if (update_end_point) {

        /* Add the packet in the buffered packet list. */

        packet_buffer->tail = pktl;

    }

    return 0;

}

int avpriv_packet_list_get(PacketList *pkt_buffer,

                           AVPacket      *pkt)

{

    PacketListEntry *pktl = pkt_buffer->head;

    if (!pktl)

        return AVERROR(EAGAIN);

    *pkt        = pktl->pkt;

    pkt_buffer->head = pktl->next;

    if (!pkt_buffer->head)

        pkt_buffer->tail = NULL;

    av_freep(&pktl);

    return 0;

}

void avpriv_packet_list_free(PacketList *pkt_buf)

{

    PacketListEntry *tmp = pkt_buf->head;

    while (tmp) {

        PacketListEntry *pktl = tmp;

        tmp = pktl->next;

        av_packet_unref(&pktl->pkt);

        av_freep(&pktl);

    }

    pkt_buf->head = pkt_buf->tail = NULL;

}

int ff_side_data_set_prft(AVPacket *pkt, int64_t timestamp)

{

    AVProducerReferenceTime *prft;

    uint8_t *side_data;

    size_t side_data_size;

    side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_PRFT, &side_data_size);

    if (!side_data) {

        side_data_size = sizeof(AVProducerReferenceTime);

        side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_PRFT, side_data_size);

    }

    if (!side_data || side_data_size < sizeof(AVProducerReferenceTime))

        return AVERROR(ENOMEM);

    prft = (AVProducerReferenceTime *)side_data;

    prft->wallclock = timestamp;

    prft->flags = 0;

    return 0;

}

const AVPacketSideData *av_packet_side_data_get(const AVPacketSideData *sd, int nb_sd,

                                                enum AVPacketSideDataType type)

{

    for (int i = 0; i < nb_sd; i++)

        if (sd[i].type == type)

            return &sd[i];

    return NULL;

}

static AVPacketSideData *packet_side_data_add(AVPacketSideData **psd, int *pnb_sd,

                                              enum AVPacketSideDataType type,

                                              void *data, size_t size)

{

    AVPacketSideData *sd = *psd, *tmp;

    int nb_sd = *pnb_sd;

    for (int i = 0; i < nb_sd; i++) {

        if (sd[i].type != type)

            continue;

        av_free(sd[i].data);

        sd[i].data = data;

        sd[i].size = size;

        return &sd[i];

    }

    if (nb_sd == INT_MAX)

        return NULL;

    tmp = av_realloc_array(sd, nb_sd + 1, sizeof(*tmp));

    if (!tmp)

        return NULL;

    *psd = sd = tmp;

    sd[nb_sd].type = type;

    sd[nb_sd].data = data;

    sd[nb_sd].size = size;

    *pnb_sd = nb_sd + 1;

    return &sd[nb_sd];

}

AVPacketSideData *av_packet_side_data_add(AVPacketSideData **psd, int *pnb_sd,

                                          enum AVPacketSideDataType type,

                                          void *data, size_t size, int flags)

{

    return packet_side_data_add(psd, pnb_sd, type, data, size);

}

AVPacketSideData *av_packet_side_data_new(AVPacketSideData **psd, int *pnb_sd,

                                          enum AVPacketSideDataType type,

                                          size_t size, int flags)

{

    AVPacketSideData *sd = NULL;

    uint8_t *data;

    if (size > SIZE_MAX - AV_INPUT_BUFFER_PADDING_SIZE)

        return NULL;

    data = av_malloc(size + AV_INPUT_BUFFER_PADDING_SIZE);

    if (!data)

        return NULL;

    memset(data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);

    sd = packet_side_data_add(psd, pnb_sd, type, data, size);

    if (!sd)

        av_freep(&data);

    return sd;

}

void av_packet_side_data_remove(AVPacketSideData *sd, int *pnb_sd,

                                enum AVPacketSideDataType type)

{

    int nb_sd = *pnb_sd;

    for (int i = nb_sd - 1; i >= 0; i--) {

        if (sd[i].type != type)

            continue;

        av_free(sd[i].data);

        sd[i] = sd[--nb_sd];

        break;

    }

    *pnb_sd = nb_sd;

}

void av_packet_side_data_free(AVPacketSideData **psd, int *pnb_sd)

{

    AVPacketSideData *sd = *psd;

    int nb_sd = *pnb_sd;

    for (int i = 0; i < nb_sd; i++)

        av_free(sd[i].data);

    av_freep(psd);

    *pnb_sd = 0;

}

static void *container_packet_alloc(void *opaque)

{

    return av_packet_alloc();

}

static void container_packet_reset(void *opaque, void *obj)

{

    av_packet_unref(obj);

}

static void container_packet_free(void *opaque, void *obj)

{

    AVPacket *pkt = obj;

    av_packet_free(&pkt);

}

static int container_packet_transfer(void *opaque, void *dst, void *src, unsigned flags)

{

    if (flags & AV_CONTAINER_FIFO_FLAG_REF)

        return av_packet_ref(dst, src);

    av_packet_move_ref(dst, src);

    return 0;

}

AVContainerFifo *av_container_fifo_alloc_avpacket(unsigned flags)

{

    return av_container_fifo_alloc(NULL, container_packet_alloc,

                                   container_packet_reset, container_packet_free,

                                   container_packet_transfer, 0);

}