yading@10: /*
yading@10:  * AVPacket functions for libavcodec
yading@10:  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <string.h>
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/mem.h"
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: void ff_packet_free_side_data(AVPacket *pkt)
yading@10: {
yading@10:     int i;
yading@10:     for (i = 0; i < pkt->side_data_elems; i++)
yading@10:         av_free(pkt->side_data[i].data);
yading@10:     av_freep(&pkt->side_data);
yading@10:     pkt->side_data_elems = 0;
yading@10: }
yading@10: 
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10: void av_destruct_packet(AVPacket *pkt)
yading@10: {
yading@10:     av_free(pkt->data);
yading@10:     pkt->data = NULL;
yading@10:     pkt->size = 0;
yading@10: }
yading@10: 
yading@10: /* a dummy destruct callback for the callers that assume AVPacket.destruct ==
yading@10:  * NULL => static data */
yading@10: static void dummy_destruct_packet(AVPacket *pkt)
yading@10: {
yading@10:     av_assert0(0);
yading@10: }
yading@10: #endif
yading@10: 
yading@10: void av_init_packet(AVPacket *pkt)
yading@10: {
yading@10:     pkt->pts                  = AV_NOPTS_VALUE;
yading@10:     pkt->dts                  = AV_NOPTS_VALUE;
yading@10:     pkt->pos                  = -1;
yading@10:     pkt->duration             = 0;
yading@10:     pkt->convergence_duration = 0;
yading@10:     pkt->flags                = 0;
yading@10:     pkt->stream_index         = 0;
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10:     pkt->destruct             = NULL;
yading@10: #endif
yading@10:     pkt->buf                  = NULL;
yading@10:     pkt->side_data            = NULL;
yading@10:     pkt->side_data_elems      = 0;
yading@10: }
yading@10: 
yading@10: int av_new_packet(AVPacket *pkt, int size)
yading@10: {
yading@10:     AVBufferRef *buf = NULL;
yading@10: 
yading@10:     if ((unsigned)size >= (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
yading@10:         return AVERROR(EINVAL);
yading@10: 
yading@10:     av_buffer_realloc(&buf, size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:     if (!buf)
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     memset(buf->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
yading@10: 
yading@10:     av_init_packet(pkt);
yading@10:     pkt->buf      = buf;
yading@10:     pkt->data     = buf->data;
yading@10:     pkt->size     = size;
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10:     pkt->destruct = dummy_destruct_packet;
yading@10: #endif
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void av_shrink_packet(AVPacket *pkt, int size)
yading@10: {
yading@10:     if (pkt->size <= size)
yading@10:         return;
yading@10:     pkt->size = size;
yading@10:     memset(pkt->data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
yading@10: }
yading@10: 
yading@10: int av_grow_packet(AVPacket *pkt, int grow_by)
yading@10: {
yading@10:     int new_size;
yading@10:     av_assert0((unsigned)pkt->size <= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:     if (!pkt->size)
yading@10:         return av_new_packet(pkt, grow_by);
yading@10:     if ((unsigned)grow_by >
yading@10:         INT_MAX - (pkt->size + FF_INPUT_BUFFER_PADDING_SIZE))
yading@10:         return -1;
yading@10: 
yading@10:     new_size = pkt->size + grow_by + FF_INPUT_BUFFER_PADDING_SIZE;
yading@10:     if (pkt->buf) {
yading@10:         int ret = av_buffer_realloc(&pkt->buf, new_size);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:     } else {
yading@10:         pkt->buf = av_buffer_alloc(new_size);
yading@10:         if (!pkt->buf)
yading@10:             return AVERROR(ENOMEM);
yading@10:         memcpy(pkt->buf->data, pkt->data, FFMIN(pkt->size, pkt->size + grow_by));
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10:         pkt->destruct = dummy_destruct_packet;
yading@10: #endif
yading@10:     }
yading@10:     pkt->data  = pkt->buf->data;
yading@10:     pkt->size += grow_by;
yading@10:     memset(pkt->data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int av_packet_from_data(AVPacket *pkt, uint8_t *data, int size)
yading@10: {
yading@10:     if (size >= INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
yading@10:         return AVERROR(EINVAL);
yading@10: 
yading@10:     pkt->buf = av_buffer_create(data, size + FF_INPUT_BUFFER_PADDING_SIZE,
yading@10:                                 av_buffer_default_free, NULL, 0);
yading@10:     if (!pkt->buf)
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     pkt->data = data;
yading@10:     pkt->size = size;
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10:     pkt->destruct = dummy_destruct_packet;
yading@10: #endif
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #define ALLOC_MALLOC(data, size) data = av_malloc(size)
yading@10: #define ALLOC_BUF(data, size)                \
yading@10: do {                                         \
yading@10:     av_buffer_realloc(&pkt->buf, size);      \
yading@10:     data = pkt->buf ? pkt->buf->data : NULL; \
yading@10: } while (0)
yading@10: 
yading@10: #define DUP_DATA(dst, src, size, padding, ALLOC)                        \
yading@10:     do {                                                                \
yading@10:         void *data;                                                     \
yading@10:         if (padding) {                                                  \
yading@10:             if ((unsigned)(size) >                                      \
yading@10:                 (unsigned)(size) + FF_INPUT_BUFFER_PADDING_SIZE)        \
yading@10:                 goto failed_alloc;                                      \
yading@10:             ALLOC(data, size + FF_INPUT_BUFFER_PADDING_SIZE);           \
yading@10:         } else {                                                        \
yading@10:             ALLOC(data, size);                                          \
yading@10:         }                                                               \
yading@10:         if (!data)                                                      \
yading@10:             goto failed_alloc;                                          \
yading@10:         memcpy(data, src, size);                                        \
yading@10:         if (padding)                                                    \
yading@10:             memset((uint8_t *)data + size, 0,                           \
yading@10:                    FF_INPUT_BUFFER_PADDING_SIZE);                       \
yading@10:         dst = data;                                                     \
yading@10:     } while (0)
yading@10: 
yading@10: /* Makes duplicates of data, side_data, but does not copy any other fields */
yading@10: static int copy_packet_data(AVPacket *pkt, AVPacket *src)
yading@10: {
yading@10:     pkt->data      = NULL;
yading@10:     pkt->side_data = NULL;
yading@10:     if (pkt->buf) {
yading@10:         AVBufferRef *ref = av_buffer_ref(src->buf);
yading@10:         if (!ref)
yading@10:             return AVERROR(ENOMEM);
yading@10:         pkt->buf  = ref;
yading@10:         pkt->data = ref->data;
yading@10:     } else {
yading@10:         DUP_DATA(pkt->data, src->data, pkt->size, 1, ALLOC_BUF);
yading@10:     }
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10:     pkt->destruct = dummy_destruct_packet;
yading@10: #endif
yading@10: 
yading@10:     if (pkt->side_data_elems) {
yading@10:         int i;
yading@10: 
yading@10:         DUP_DATA(pkt->side_data, src->side_data,
yading@10:                 pkt->side_data_elems * sizeof(*pkt->side_data), 0, ALLOC_MALLOC);
yading@10:         memset(pkt->side_data, 0,
yading@10:                 pkt->side_data_elems * sizeof(*pkt->side_data));
yading@10:         for (i = 0; i < pkt->side_data_elems; i++) {
yading@10:             DUP_DATA(pkt->side_data[i].data, src->side_data[i].data,
yading@10:                     src->side_data[i].size, 1, ALLOC_MALLOC);
yading@10:             pkt->side_data[i].size = src->side_data[i].size;
yading@10:             pkt->side_data[i].type = src->side_data[i].type;
yading@10:         }
yading@10:     }
yading@10:     return 0;
yading@10: 
yading@10: failed_alloc:
yading@10:     av_destruct_packet(pkt);
yading@10:     return AVERROR(ENOMEM);
yading@10: }
yading@10: 
yading@10: int av_dup_packet(AVPacket *pkt)
yading@10: {
yading@10:     AVPacket tmp_pkt;
yading@10: 
yading@10:     if (!pkt->buf && pkt->data
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10:         && !pkt->destruct
yading@10: #endif
yading@10:         ) {
yading@10:         tmp_pkt = *pkt;
yading@10:         return copy_packet_data(pkt, &tmp_pkt);
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int av_copy_packet(AVPacket *dst, AVPacket *src)
yading@10: {
yading@10:     *dst = *src;
yading@10:     return copy_packet_data(dst, src);
yading@10: }
yading@10: 
yading@10: void av_free_packet(AVPacket *pkt)
yading@10: {
yading@10:     if (pkt) {
yading@10:         int i;
yading@10: 
yading@10:         if (pkt->buf)
yading@10:             av_buffer_unref(&pkt->buf);
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10:         else if (pkt->destruct)
yading@10:             pkt->destruct(pkt);
yading@10:         pkt->destruct = NULL;
yading@10: #endif
yading@10:         pkt->data            = NULL;
yading@10:         pkt->size            = 0;
yading@10: 
yading@10:         for (i = 0; i < pkt->side_data_elems; i++)
yading@10:             av_free(pkt->side_data[i].data);
yading@10:         av_freep(&pkt->side_data);
yading@10:         pkt->side_data_elems = 0;
yading@10:     }
yading@10: }
yading@10: 
yading@10: uint8_t *av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
yading@10:                                  int size)
yading@10: {
yading@10:     int elems = pkt->side_data_elems;
yading@10: 
yading@10:     if ((unsigned)elems + 1 > INT_MAX / sizeof(*pkt->side_data))
yading@10:         return NULL;
yading@10:     if ((unsigned)size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE)
yading@10:         return NULL;
yading@10: 
yading@10:     pkt->side_data = av_realloc(pkt->side_data,
yading@10:                                 (elems + 1) * sizeof(*pkt->side_data));
yading@10:     if (!pkt->side_data)
yading@10:         return NULL;
yading@10: 
yading@10:     pkt->side_data[elems].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:     if (!pkt->side_data[elems].data)
yading@10:         return NULL;
yading@10:     pkt->side_data[elems].size = size;
yading@10:     pkt->side_data[elems].type = type;
yading@10:     pkt->side_data_elems++;
yading@10: 
yading@10:     return pkt->side_data[elems].data;
yading@10: }
yading@10: 
yading@10: uint8_t *av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
yading@10:                                  int *size)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < pkt->side_data_elems; i++) {
yading@10:         if (pkt->side_data[i].type == type) {
yading@10:             if (size)
yading@10:                 *size = pkt->side_data[i].size;
yading@10:             return pkt->side_data[i].data;
yading@10:         }
yading@10:     }
yading@10:     return NULL;
yading@10: }
yading@10: 
yading@10: #define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
yading@10: 
yading@10: int av_packet_merge_side_data(AVPacket *pkt){
yading@10:     if(pkt->side_data_elems){
yading@10:         AVBufferRef *buf;
yading@10:         int i;
yading@10:         uint8_t *p;
yading@10:         uint64_t size= pkt->size + 8LL + FF_INPUT_BUFFER_PADDING_SIZE;
yading@10:         AVPacket old= *pkt;
yading@10:         for (i=0; i<old.side_data_elems; i++) {
yading@10:             size += old.side_data[i].size + 5LL;
yading@10:         }
yading@10:         if (size > INT_MAX)
yading@10:             return AVERROR(EINVAL);
yading@10:         buf = av_buffer_alloc(size);
yading@10:         if (!buf)
yading@10:             return AVERROR(ENOMEM);
yading@10:         pkt->buf = buf;
yading@10:         pkt->data = p = buf->data;
yading@10: #if FF_API_DESTRUCT_PACKET
yading@10:         pkt->destruct = dummy_destruct_packet;
yading@10: #endif
yading@10:         pkt->size = size - FF_INPUT_BUFFER_PADDING_SIZE;
yading@10:         bytestream_put_buffer(&p, old.data, old.size);
yading@10:         for (i=old.side_data_elems-1; i>=0; i--) {
yading@10:             bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
yading@10:             bytestream_put_be32(&p, old.side_data[i].size);
yading@10:             *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
yading@10:         }
yading@10:         bytestream_put_be64(&p, FF_MERGE_MARKER);
yading@10:         av_assert0(p-pkt->data == pkt->size);
yading@10:         memset(p, 0, FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:         av_free_packet(&old);
yading@10:         pkt->side_data_elems = 0;
yading@10:         pkt->side_data = NULL;
yading@10:         return 1;
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int av_packet_split_side_data(AVPacket *pkt){
yading@10:     if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
yading@10:         int i;
yading@10:         unsigned int size;
yading@10:         uint8_t *p;
yading@10: 
yading@10:         p = pkt->data + pkt->size - 8 - 5;
yading@10:         for (i=1; ; i++){
yading@10:             size = AV_RB32(p);
yading@10:             if (size>INT_MAX || p - pkt->data < size)
yading@10:                 return 0;
yading@10:             if (p[4]&128)
yading@10:                 break;
yading@10:             p-= size+5;
yading@10:         }
yading@10: 
yading@10:         pkt->side_data = av_malloc(i * sizeof(*pkt->side_data));
yading@10:         if (!pkt->side_data)
yading@10:             return AVERROR(ENOMEM);
yading@10: 
yading@10:         p= pkt->data + pkt->size - 8 - 5;
yading@10:         for (i=0; ; i++){
yading@10:             size= AV_RB32(p);
yading@10:             av_assert0(size<=INT_MAX && p - pkt->data >= size);
yading@10:             pkt->side_data[i].data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:             pkt->side_data[i].size = size;
yading@10:             pkt->side_data[i].type = p[4]&127;
yading@10:             if (!pkt->side_data[i].data)
yading@10:                 return AVERROR(ENOMEM);
yading@10:             memcpy(pkt->side_data[i].data, p-size, size);
yading@10:             pkt->size -= size + 5;
yading@10:             if(p[4]&128)
yading@10:                 break;
yading@10:             p-= size+5;
yading@10:         }
yading@10:         pkt->size -= 8;
yading@10:         pkt->side_data_elems = i+1;
yading@10:         return 1;
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int av_packet_shrink_side_data(AVPacket *pkt, enum AVPacketSideDataType type,
yading@10:                                int size)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < pkt->side_data_elems; i++) {
yading@10:         if (pkt->side_data[i].type == type) {
yading@10:             if (size > pkt->side_data[i].size)
yading@10:                 return AVERROR(ENOMEM);
yading@10:             pkt->side_data[i].size = size;
yading@10:             return 0;
yading@10:         }
yading@10:     }
yading@10:     return AVERROR(ENOENT);
yading@10: }