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ffmpeg/libavcodec/packet.c

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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 <string.h>
#include "libavutil/avassert.h"
#include "libavutil/avutil.h"
#include "libavutil/intreadwrite.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_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";
}
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 (size && 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));
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)
packet_buffer->tail->next = pktl;
else
packet_buffer->head = pktl;
/* 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_encoder_stats(AVPacket *pkt, int quality, int64_t *error, int error_count, int pict_type)
{
uint8_t *side_data;
size_t side_data_size;
int i;
side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_QUALITY_STATS, &side_data_size);
if (!side_data) {
side_data_size = 4+4+8*error_count;
side_data = av_packet_new_side_data(pkt, AV_PKT_DATA_QUALITY_STATS,
side_data_size);
}
if (!side_data || side_data_size < 4+4+8*error_count)
return AVERROR(ENOMEM);
AV_WL32(side_data , quality );
side_data[4] = pict_type;
side_data[5] = error_count;
for (i = 0; i<error_count; i++)
AV_WL64(side_data+8 + 8*i , error[i]);
return 0;
}
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;
}
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