static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data,
                              AVStream *st, AVPacket *pkt, uint32_t *timestamp,
                              const uint8_t *buf, int len, int flags)
{
    uint8_t nal;
    uint8_t type;
    int result = 0;
    if (!len) {
        av_log(ctx, AV_LOG_ERROR, "Empty H264 RTP packet\n");
        return AVERROR_INVALIDDATA;
    }
    nal  = buf[0];
    type = nal & 0x1f;
    assert(data);
    assert(buf);
    if (type >= 1 && type <= 23)
        type = 1;
    switch (type) {
    case 0:
    case 1:
        av_new_packet(pkt, len + sizeof(start_sequence));
        memcpy(pkt->data, start_sequence, sizeof(start_sequence));
        memcpy(pkt->data + sizeof(start_sequence), buf, len);
        COUNT_NAL_TYPE(data, nal);
        break;
    case 24:
        buf++;
        len--;
        {
            int pass         = 0;
            int total_length = 0;
            uint8_t *dst     = NULL;
            for (pass = 0; pass < 2; pass++) {
                const uint8_t *src = buf;
                int src_len        = len;
                while (src_len > 2) {
                    uint16_t nal_size = AV_RB16(src);
                    src     += 2;
                    src_len -= 2;
                    if (nal_size <= src_len) {
                        if (pass == 0) {
                            total_length += sizeof(start_sequence) + nal_size;
                        } else {
                            assert(dst);
                            memcpy(dst, start_sequence, sizeof(start_sequence));
                            dst += sizeof(start_sequence);
                            memcpy(dst, src, nal_size);
                            COUNT_NAL_TYPE(data, *src);
                            dst += nal_size;
                        }
                    } else {
                        av_log(ctx, AV_LOG_ERROR,
                               "nal size exceeds length: %d %d\n", nal_size, src_len);
                    }
                    src     += nal_size;
                    src_len -= nal_size;
                    if (src_len < 0)
                        av_log(ctx, AV_LOG_ERROR,
                               "Consumed more bytes than we got! (%d)\n", src_len);
                }
                if (pass == 0) {
                    av_new_packet(pkt, total_length);
                    dst = pkt->data;
                } else {
                    assert(dst - pkt->data == total_length);
                }
            }
        }
        break;
    case 25:
    case 26:
    case 27:
    case 29:
        av_log(ctx, AV_LOG_ERROR,
               "Unhandled type (%d) (See RFC for implementation details\n",
               type);
        result = AVERROR(ENOSYS);
        break;
    case 28:
        buf++;
        len--;
        if (len > 1) {
            uint8_t fu_indicator      = nal;
            uint8_t fu_header         = *buf;
            uint8_t start_bit         = fu_header >> 7;
            uint8_t av_unused end_bit = (fu_header & 0x40) >> 6;
            uint8_t nal_type          = fu_header & 0x1f;
            uint8_t reconstructed_nal;
            reconstructed_nal  = fu_indicator & 0xe0;
            reconstructed_nal |= nal_type;
            buf++;
            len--;
            if (start_bit)
                COUNT_NAL_TYPE(data, nal_type);
            if (start_bit) {
                av_new_packet(pkt, sizeof(start_sequence) + sizeof(nal) + len);
                memcpy(pkt->data, start_sequence, sizeof(start_sequence));
                pkt->data[sizeof(start_sequence)] = reconstructed_nal;
                memcpy(pkt->data + sizeof(start_sequence) + sizeof(nal), buf, len);
            } else {
                av_new_packet(pkt, len);
                memcpy(pkt->data, buf, len);
            }
        } else {
            av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H264 RTP packet\n");
            result = AVERROR_INVALIDDATA;
        }
        break;
    case 30:
    case 31:
    default:
        av_log(ctx, AV_LOG_ERROR, "Undefined type (%d)\n", type);
        result = AVERROR_INVALIDDATA;
        break;
    }
    pkt->stream_index = st->index;
    return result;
}
['static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data,\n                              AVStream *st, AVPacket *pkt, uint32_t *timestamp,\n                              const uint8_t *buf, int len, int flags)\n{\n    uint8_t nal;\n    uint8_t type;\n    int result = 0;\n    if (!len) {\n        av_log(ctx, AV_LOG_ERROR, "Empty H264 RTP packet\\n");\n        return AVERROR_INVALIDDATA;\n    }\n    nal  = buf[0];\n    type = nal & 0x1f;\n    assert(data);\n    assert(buf);\n    if (type >= 1 && type <= 23)\n        type = 1;\n    switch (type) {\n    case 0:\n    case 1:\n        av_new_packet(pkt, len + sizeof(start_sequence));\n        memcpy(pkt->data, start_sequence, sizeof(start_sequence));\n        memcpy(pkt->data + sizeof(start_sequence), buf, len);\n        COUNT_NAL_TYPE(data, nal);\n        break;\n    case 24:\n        buf++;\n        len--;\n        {\n            int pass         = 0;\n            int total_length = 0;\n            uint8_t *dst     = NULL;\n            for (pass = 0; pass < 2; pass++) {\n                const uint8_t *src = buf;\n                int src_len        = len;\n                while (src_len > 2) {\n                    uint16_t nal_size = AV_RB16(src);\n                    src     += 2;\n                    src_len -= 2;\n                    if (nal_size <= src_len) {\n                        if (pass == 0) {\n                            total_length += sizeof(start_sequence) + nal_size;\n                        } else {\n                            assert(dst);\n                            memcpy(dst, start_sequence, sizeof(start_sequence));\n                            dst += sizeof(start_sequence);\n                            memcpy(dst, src, nal_size);\n                            COUNT_NAL_TYPE(data, *src);\n                            dst += nal_size;\n                        }\n                    } else {\n                        av_log(ctx, AV_LOG_ERROR,\n                               "nal size exceeds length: %d %d\\n", nal_size, src_len);\n                    }\n                    src     += nal_size;\n                    src_len -= nal_size;\n                    if (src_len < 0)\n                        av_log(ctx, AV_LOG_ERROR,\n                               "Consumed more bytes than we got! (%d)\\n", src_len);\n                }\n                if (pass == 0) {\n                    av_new_packet(pkt, total_length);\n                    dst = pkt->data;\n                } else {\n                    assert(dst - pkt->data == total_length);\n                }\n            }\n        }\n        break;\n    case 25:\n    case 26:\n    case 27:\n    case 29:\n        av_log(ctx, AV_LOG_ERROR,\n               "Unhandled type (%d) (See RFC for implementation details\\n",\n               type);\n        result = AVERROR(ENOSYS);\n        break;\n    case 28:\n        buf++;\n        len--;\n        if (len > 1) {\n            uint8_t fu_indicator      = nal;\n            uint8_t fu_header         = *buf;\n            uint8_t start_bit         = fu_header >> 7;\n            uint8_t av_unused end_bit = (fu_header & 0x40) >> 6;\n            uint8_t nal_type          = fu_header & 0x1f;\n            uint8_t reconstructed_nal;\n            reconstructed_nal  = fu_indicator & 0xe0;\n            reconstructed_nal |= nal_type;\n            buf++;\n            len--;\n            if (start_bit)\n                COUNT_NAL_TYPE(data, nal_type);\n            if (start_bit) {\n                av_new_packet(pkt, sizeof(start_sequence) + sizeof(nal) + len);\n                memcpy(pkt->data, start_sequence, sizeof(start_sequence));\n                pkt->data[sizeof(start_sequence)] = reconstructed_nal;\n                memcpy(pkt->data + sizeof(start_sequence) + sizeof(nal), buf, len);\n            } else {\n                av_new_packet(pkt, len);\n                memcpy(pkt->data, buf, len);\n            }\n        } else {\n            av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H264 RTP packet\\n");\n            result = AVERROR_INVALIDDATA;\n        }\n        break;\n    case 30:\n    case 31:\n    default:\n        av_log(ctx, AV_LOG_ERROR, "Undefined type (%d)\\n", type);\n        result = AVERROR_INVALIDDATA;\n        break;\n    }\n    pkt->stream_index = st->index;\n    return result;\n}', 'int av_new_packet(AVPacket *pkt, int size)\n{\n    uint8_t *data = NULL;\n    if ((unsigned)size < (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)\n        data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);\n    if (data) {\n        memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);\n    } else\n        size = 0;\n    av_init_packet(pkt);\n    pkt->data     = data;\n    pkt->size     = size;\n    pkt->destruct = av_destruct_packet;\n    if (!data)\n        return AVERROR(ENOMEM);\n    return 0;\n}', 'void *av_malloc(size_t size)\n{\n    void *ptr = NULL;\n#if CONFIG_MEMALIGN_HACK\n    long diff;\n#endif\n    if (size > (INT_MAX-32) || !size)\n        return NULL;\n#if CONFIG_MEMALIGN_HACK\n    ptr = malloc(size+32);\n    if(!ptr)\n        return ptr;\n    diff= ((-(long)ptr - 1)&31) + 1;\n    ptr = (char*)ptr + diff;\n    ((char*)ptr)[-1]= diff;\n#elif HAVE_POSIX_MEMALIGN\n    if (posix_memalign(&ptr,32,size))\n        ptr = NULL;\n#elif HAVE_ALIGNED_MALLOC\n    ptr = _aligned_malloc(size, 32);\n#elif HAVE_MEMALIGN\n    ptr = memalign(32,size);\n#else\n    ptr = malloc(size);\n#endif\n    return ptr;\n}', 'void av_init_packet(AVPacket *pkt)\n{\n    pkt->pts                  = AV_NOPTS_VALUE;\n    pkt->dts                  = AV_NOPTS_VALUE;\n    pkt->pos                  = -1;\n    pkt->duration             = 0;\n    pkt->convergence_duration = 0;\n    pkt->flags                = 0;\n    pkt->stream_index         = 0;\n    pkt->destruct             = NULL;\n    pkt->side_data            = NULL;\n    pkt->side_data_elems      = 0;\n}']